GB2193812A - Roller shoe with load measurement means - Google Patents

Description

GB2193812A 1 SPECIFICATION In an advantageous preferred embodiment of the

invention, the or each deformation sensor Roller shoe with load measurement means or transducer with load measurement is pro tected by placing it or them in the part of the The present invention concerns a roller shoe 70 rolling track in the basic body which is not assembly with load measurement means. underload.

It is known that the load exerted on a roller The invention is further described, purely by shoe assembly or construction decisively influ- way of example, with reference to preferred ences the service lifetime, operability as well embodiments shown in the drawing, wherein:

as the accuracy of the construction. An over- 75 Figure 1 is a side view, partly in elevation load has the consequence of a premature and partly in section, of a roller shoe con damaging or destruction of the construction or struction according to the invention with load an increase in the rolling resistance. If, on the measurement means; other hand, the load is insufficient, then the Figure 2 is a partial plan view of the roller precision of the movement and the accuracy 80 shoe construction shown in Fig. 1; of the function are worsened and the stiffness Figure 3 is similar to Fig. 2 but shows a of the whole assembly deteriorates. Thus, the variant of an electrical coupling; and desired function of a roller shoe construction Figure 4 is a further preferred embodiment is assured when the load on the construction of the roller shoe construction according to during use exactly corresponds to the design 85 the invention, in crosssectional end view.

load, Referring first to Figs. 1 and 2, there is The task of measuring the load on roller shown a roller shoe construction 1 according shoe constructions is known from a measure- to the invention having a basic body 2 around ment block sold under the name DEFLEKTO- which is a rolling track 6. The basic body 2 is METER, marketed by the West German comequipped with a deformation sensor or trans pany INA. ducer 3 capable of load measurement and The known measurement block serves for connectible by way of a conductor 4 to an adjusting the load of a roller shoe construcindicating/recording apparatus, not shown, or tion: it is built in or mounted in place of the to a data processing/amplifying apparatus, roller shoe, the desired pressure is produced 95 also not shown.

hydraulically and the deformation associated As may be observed, the deformation sen- with this pressure is measured. Then the mea- sor or transducer 3 with load measurement suring block is removed and the roller shoe is capabilities is preferably mounted on that part remounted into position, and the construction of the rolling track 6 of the basic body 2 is tensioned wholly mechanically to the previ- 100 which is not under load.

ously measured magnitude or value of the de- Fig. 3 illustrates a variant in which the sen- formation. sors 3 are connected with a terminal 5 arThe drawbacks of this known technical solu- ranged on the roller shoe assembly 1 with a tion lie in that the load measurement can only load measurement. A non- illustrated indicating take place in a stationary condition of the rol- 105 device or instrument is connected to the ter ler shoe so that it is only capable of measur- minal 5 via a conductor 4.

ing static loads; it cannot indicate the force The Fig. 4 variant illustrates that the sen- changes or variations associated with relative sor/transducer(s) 3 may be located in a bore movements in the construction in use, and within the basic or main body 2.

furthermore a lot of time, work and costs are 110 The deformation sensor with load measure- involved in the operations of removal and re- ment may be a strain gauge, a semi-conductor mounting of the roller shoe construction, strip or a piezo-electric or magnetostrictive which operations may also represent sources sensor etc.

of faults; the construction is complicated; and The mode of operation of the roller shoe auxiliary devices are required for performing 115 construction 1 with load measurement accord the load measurement. ing to the invention may be described in brief The aim of the present invention is the ob- as follows.

viation of the above drawbacks and the pro- In operation, the assembled and mounted vision of a simple, inexpensive and continually roller shoe construction 1 with load measure functioning as well as simply mountable load 120 ment together with its basic body 2 are sub measurement device in conjunction with a rol- jected to constant deformation stresses. The ler shoe construction. essence of this deformation is that it is ap- The task of the invention consists in provid- proximately constant in the load zone of the ing the roller shoe construction with load mea- basic body 2 while at its two ends, at the surement facilities. This task is solved for rol125 entry and exit of the rolling elements, it is of ler shoe constructions of the above-mentioned a pulsating character.

type according to the invention in that at least This deformation is converted into electric one deformation sensor or transducer with signal by the transducer/sensors 3 and these load measurement is arranged in and/or on signals are passed via the conductor 4 to an the basic body of the roller shoe construction. 130 indicating device.

2 GB2193812A 2 The roller shoe construction 1 according to the invention carries out measurements in a continuous manner so that it can indicate or record changes in the load at any given ip- stant.

Claims (3)

1. A roller shoe construction with load measurement wherein on and/or the basic body of the roller shoe construction at least one deformation sensor/transducer with load measurement is/are arranged.

2. A construction according to claim 1, wherein the or each sensor or transducer is arranged on an unloaded track section of the basic body.

3. A construction according to claim 1 or 2, substantially as herein described with refer ence to and as shown in Figs. 1 and 2 or Figs. 1 and 3 or Fig. 4 of the accompanying drawing.

Published 1988 at The Patent Office, State House, 66/71 HighHolborn, London WC I R 4TP. Further copies may be obtained from The Patent Office, Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD.

Printed by Burgess & Son (Abingdon) Ltd. Con. 1/87.