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Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0502748-A1-19920909
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EP-0502748-A1-19920909
An air motor (3) generates primary torque, an oil pressure pulse generating unit (4) converts the primary torque into a pulsatory secondary torque, which is applied to a main spindle (16), a transducer (5) detects the secondary torque, and a shut-off valve (21) is closed to stop supply of compressed air to the motor (3) when the secondary torque exceeds a predetermined threshold value. The spindle (16) is made of magnetostrictive material and its distortion is detected by a pair of coils (17a,17b) arranged in opposition to the spindle (16). The coils (17a,17b) are connected into a bridge circuit together with resistors (27a,27b) and an exciting current having a sinusoidal waveform is supplied to one set of diagonal points (A,B) of the bridge circuit. The voltage appearing across the other set of diagonal points (C,D) is detected to produce a torque detection signal which represents the secondary torque. The torque detection signal is sampled and held at a predetermined phase which is fixedly related to a phase of the exciting current, to produce a torque measurement signal which represent a peak value of the secondary torque applied to the spindle (16).
An air motor (3) generates primary torque, an oil pressure pulse generating unit (4) converts the primary torque into a pulsatory secondary torque, which is applied to a main spindle (16), a transducer (5) detects the secondary torque, and a shut-off valve (21) is closed to stop supply of compressed air to the motor (3) when the secondary torque exceeds a predetermined threshold value. The spindle (16) is made of magnetostrictive material and its distortion is detected by a pair of coils (17a,17b) arranged in opposition to the spindle (16). The coils (17a,17b) are connected into a bridge circuit together with resistors (27a,27b) and an exciting current having a sinusoidal waveform is supplied to one set of diagonal points (A,B) of the bridge circuit. The voltage appearing across the other set of diagonal points (C,D) is detected to produce a torque detection signal which represents the secondary torque. The torque detection signal is sampled and held at a predetermined phase which is fixedly related to a phase of the exciting current, to produce a torque measurement signal which represent a peak value of the secondary torque applied to the spindle (16).
en
European Patent Office
EP0502748
EP 0502748
B25B 23/145
G01L 03/10
Impact Wrench having Torque Controlling Faculty
Impact Wrench having Torque Controlling Faculty - European Patent Office - EP 0502748 A1
Impact Wrench having Torque Controlling Faculty - European Patent Office - EP 0502748 A1
Adobe PDF Library 8.0
"EP0502748"; "EP 0502748"; "B25B 23/145"; "G01L 03/10"; "Impact Wrench having Torque Controlling Faculty"
1.4
1
B
17
EP
0502748
A1
1992-09-09
92301947
1992-03-06
JP
1237091
1991-03-07
B25B 23/145
G01L 03/10
NISSAN MOTOR COMPANY LIMITED
URYU SEISAKU, LTD.
Maruyama, Junichi
Fukumura, Teruo
Kawaguchi, Sadatsugu, c/o Uryu Seisaku Ltd.
Godwin, Edgar James et al
Impact Wrench having Torque Controlling Faculty
Schlagschrauber mit Drehmomentreglung
Impact Wrench having Torque Controlling Faculty
Clé à chocs avec commande de couple
An air motor (3) generates primary torque, an oil pressure pulse generating unit (4) converts the primary torque into a pulsatory secondary torque, which is applied to a main spindle (16), a transducer (5) detects the secondary torque, and a shut-off valve (21) is closed to stop supply of compressed air to the motor (3) when the secondary torque exceeds a predetermined threshold value. The spindle (16) is made of magnetostrictive material and its distortion is detected by a pair of coils (17a,17b) arranged in opposition to the spindle (16). The coils (17a,17b) are connected into a bridge circuit together with resistors (27a,27b) and an exciting current having a sinusoidal waveform is supplied to one set of diagonal points (A,B) of the bridge circuit. The voltage appearing across the other set of diagonal points (C,D) is detected to produce a torque detection signal which represents the secondary torque. The torque detection signal is sampled and held at a predetermined phase which is fixedly related to a phase of the exciting current, to produce a torque measurement signal which represent a peak value of the secondary torque applied to the spindle (16).
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