GB2239321A

GB2239321A - Device for measuring rotary resistance

Info

Publication number: GB2239321A
Application number: GB9024610A
Authority: GB
Inventors: Ulrich Krug
Original assignee: Hoesch AG
Current assignee: Fried Krupp AG Hoesch Krupp
Priority date: 1989-11-15
Filing date: 1990-11-13
Publication date: 1991-06-26
Anticipated expiration: 2010-11-13
Also published as: DE3937935C2; DE3937935A1; GB2239321B; SE9003390L; SE9003390D0; GB9024610D0

Abstract

The invention provides for a device (2) for measuring the rotary resistance of a component (1) and in particular a cylindrical component, eg a submarine periscope, in such a way that the rotary resistance can be measured as accurately as possible, and furthermore to enable the device (2) to be fully assembled for use without difficulty, the device (2) comprising one or more rollers (10), provided with a drive (9), and which are connected by way of a frame (3) to counter-rollers (11, 12) and are movable, normal to their axis of rotation, against the outer wall (13) or the inner wall (25) of the cylindrical component (1), and a measuring device (23), which holds the frame (3) and is connected to a fixed or anchor point (22). <IMAGE>

Description

DEVICE FOR MEASURING ROTARY RESISTANCE DESCRIPTION

The present invention relates to a device for measuring rotary resistance and in particulart but not exclusivelyr to a device for measuring rotary resistance of cylindrical components.

Such measuring devices are used, for example, to measure the rotary resistance experienced with submarine periscopes. The rotary resistance of such periscopes is, above all, determined by the friction pressures of the associated seals, which pressure varies depending on the depth of immersion and so has to be measured several times during assembly of the periscope. Known devices have the disadvantage of indicating inaccurate results, since, for example, they apply additional forces to the periscope. Furthermore. these known devices are disadvantageously heavy.

The invention seeks to provide a device, of the abovedescribed type, in such a way that the rotary resistance can be measured as accurately as possible without at least some of the above disadvantages. Furthermore, the device should be light and should be able to be fitted on and removed from the finished article without difficulty.

According to one aspect of the invention, there is provided a device for measuring the rotary resistance of a component comprising drive means for driving at least one roller mounted on frame means, at least one further roller mounted on the frame means. the rollers being engageable with a surface of the component, and a measuring device operative between the frame means and a fixed point.

According to another aspect of the invention, there is provided a device f or measuring rotary resistance on cylindrical components, comprising 6ne or more rollers, which are provided with a drive, are connected by way of a frame to counter-rollers and are pressed, normal to the axis, against the outer wall or inner wall of the cylindrical component, and a measuring device, which engages the frame and is connected to a fixed point.

Particular advantages of devices embodying the invention reside in that only minimum and constant additional radial loads have to be applied to the cylindrical component, which increases the measurement accuracy. Diameter tolerances of the cylindrical component do not have any effect on the measurement result.

Also, a pressure measuring box can be used as the measuring device, which device is substantially less expensive than conventional measuring devices which require a torque measuring shaft. Furthermore, the described device is smaller, and easier to fit and to transport.

The measuring device can not only be used for measuring rotary resistances on periscopes but can also be used in the same way to measure the rotary resistances of any cylindrical objects or pipes.

The invention is described further hereinafter, by way of example only, with reference to the accompanying drawing which is a sectional view of a device embodying the present invention.

In the drawing. a tubular and cylindrical component 1. also shown in section. is surrounded by a device 2 embodying the invention and for measuring rotary resistance. The device 2 has a frame 3 which has an outer casing 4 and two disc-shaped side parts 5 (shown in section in the drawing) t and surrounds the cylindrical component 1. The frame 3 is in two parts. wherein one part 6 is pivotable relative to the other part 7 by way of a joint 8. As a result, it is possible to fit the device 2 simply around the cylindrical component 1. The outer easing 4 receives all the elements of the device 2. A roller 10 is driven by way of a drive 9 in the form of a motor. During the operation, counterrollers 11, 12, like the driven roller 10, abut against the outer wall 13 of the cylindrical component 1. A screw 14. which is biassed by a spring and which connects the parts 6, 7 of the frame 3, presses the rollers 10, 11, 12 against the outer wall 13 of the cylindrical component 1. Such abutment is further facilitated by a rubber-elastic peripheral ring provided on each of the rollers 10, 11, 12.

According to the illustration, it can be seen how the rotary motion of the roller 10. provided by way of the drive 9, is transmitted to the counter-rollers 11, 12. A drive device, comprising a toothed belt 15 is provided, which is driven by a gear wheel 16 on the driven roller and transmits the rotary motion to gear wheels 17. 18 on each respective counter-roller 11,12. Inner deflecting rollers 19 and outer deflecting rollers 20 guide the toothed belt in such a way that the parts 6, 7 of the frame 3, which are pivotable relative to one another, may be opened to provide free access to the cylindrical component 1 to be measured in the opened state of the device 2. The device 2 is disposed so as to be freely rotatable on the outer wall 13 of the cylindrical component 1. In order to measure the rotary resistance, the device 2 is held on a lever 21, which is in the form of part of the frame 3. Between the lever 21 and a fi.xed point 22 there is provided, tangentially to the periphery of the cylindrical component 1, a pressure measuring box as a measuring device 23. The force measured by this pressure measuring box multiplied by the distance from the centre 24 of rotation of the component provides a very accurate measurement of the moment of rotary resistance on the cylindrical component 1. This measurement result is not influenced by further outside forces. By changing the rotational speed of the driven roller 10. the rotary resistance can be measured at different speeds and directions of rotation.

The described device may act in a corresponding manner on the inner wall 25 of the cylindrical component 1. The device 2 is, in this case, formed in such a way that the roller 10 and the counter-rollers 11, 12 project beyond it on the outer periphery and press against the inner wall 25 of the cylindrical component 1. In this embodiment, the lever 21 must be disposed with the measuring device 23, like the drive 9, within the periphery of the device 2. In order to insert the device 2 into the cylindrical component 1, the entire frame 3 is folded up by way of a joint 8 and is pressed apart by way of a spring for measurement. In an alternative embodiment, it is also possible to form the roller 10 and/or the counter-rollers 11, 12 so as to be radially displaceablef wherein, on insertion of the device 2, they are displaced inwards and, on measurementr they are pressed by way of a spring or other biassing means radially outwardly against the inner wall 25 of the cylindrical component 1.

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Claims

1. A device for measuring the rotary resistance of a component comprising drive means f or driving at least one roller mounted on frame means, at least one further roller mounted on the frame means, the rollers being engageable with a surf ace of the component, and a measuring device operative between the frame means and a fixed point.

2. A device as claimed in claim 1, wherein the rollers are engageable with an outer surface of the component.

3. A device as claimed in claim 1, wherein.the rollers are engageable with an inner surface of the component.

4. A device as claimed in claim 1, 2 or 3, wherein the rollers are engaged with the surf ace in a direction substantially perpendicular to the roller axis of rotation.

5. A device as claimed in any one of claims 1 to 4, and arranged for measuring the rotary resistance of a cylindrical component.

6. A device for measuring rotary resistance on cylindrical components, comprising one or more rollers, which are provided with a drive, are connected by way of a f rame to counter-rollers and are pressed, normal to the axis# against the outer wall or inner wall of the cylindrical component, and a measuring device, which engages the frame and is connected to a fixed point.

7. A device as claimed in claim 5 or 6, wherein the measuring device is arranged to be disposed tangentially to and at a distance from, the periphery of the cylindrical component.

8. A device as claimed in any preceding claim, wherein the frame means is of a multi-part construction. at least two of which parts are pivotable relative to one another.

9. A device as claimed in any preceding claim, wherein the rotary motion of the driven roller can be transmitted by way of a drive device to the at least one further, or counter, roller.

10. A device as claimed in claim 9, wherein the drive device comprises a drive belt.

11. A device as claimed in claim 10, wherein the drive device includes at least one belt deflecting roller.

12. A device for measuring the rotary resistance of a component substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.

1 Published 1991 at The Patent Office, State House. 65.6171 HighHolborn, UndonWC I R 4TP. Further copies my be obtained from Sales Branch. Unit 6. Nine Mile Point. Cwmfelinfach. Cross Keys. New.Dort, NPI 7HZ. Printed by Multiplex techniques ltd. St Mary Cray. Kent.

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