EP1404491A1 - Pressure-operated power screwdriver having a measuring section - Google Patents
Pressure-operated power screwdriver having a measuring sectionInfo
- Publication number
- EP1404491A1 EP1404491A1 EP02754816A EP02754816A EP1404491A1 EP 1404491 A1 EP1404491 A1 EP 1404491A1 EP 02754816 A EP02754816 A EP 02754816A EP 02754816 A EP02754816 A EP 02754816A EP 1404491 A1 EP1404491 A1 EP 1404491A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- housing
- measuring section
- power screwdriver
- ratchet lever
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
- B25B23/1456—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers having electrical components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
- B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
Definitions
- the invention relates to a pressure-operated hydraulic or pneumatic power wrench with a drive part and a functional part, the functional part having a shaft driven by a ratchet lever, which has a driving device, and with a measuring section which determines the torsion element.
- a hydraulic power wrench of this type is known from DE 296 07 207.
- the . Elle across the housing of the functional part.
- a torsion-capable measuring section is provided on the shaft outside the housing.
- a torsion sensor in the form of several strain gauges is attached to the shaft in this measuring section.
- the torsion sensor forms an electrical resistance arrangement, the resistance of which depends on the torsional moment.
- At the end of the shaft there is a driving device that can be coupled with a tool or with a screw head.
- This power wrench with measuring cell makes it possible to measure the torsional moment acting on the screw, whereby the tightening torque can be determined directly on the screw connection.
- the invention has for its object to provide a pressure-operated power screwdriver with drive part, functional part and a measuring section which has small dimensions in the axial direction of the screw and can therefore also be used with a low head height (above the screw).
- the measuring section is at least partially arranged in the area enclosed by the housing.
- the measuring section is therefore located in the area covered by the housing or at least projects into this area.
- the measuring section is formed in a cavity of the shaft or a tubular part connected to it.
- the torsion sensor of the measuring section is attached to the inner wall of the cavity. No space for the torsion sensor is required on the outside of the shaft. This can overlap with a toothing which is provided on the outside of the shaft and on which the ratchet lever engages.
- the measuring section of the shaft therefore does not require any additional length.
- Cavity of the torsion sensor is housed protected from external influences and that an additional encapsulation of the measuring section is not necessary.
- the driving device is designed as a key nut, which is an integral part of the shaft.
- the protrusion of the shaft over the housing is reduced to a minimum.
- the cavity of the key nut can extend into the housing.
- the driver device for example, as a square, onto which a key nut can be attached. However, this increases the length of the shaft, including the key nut.
- a fourth solution to the problem is specified in claim 4.
- the measuring section is then arranged on or in a tubular part of a key nut.
- the key nut can be an integral part of the shaft or it can also be connected to the shaft.
- An angle sensor can be provided on the housing, which determines the angle of rotation of the shaft.
- a direct angle of rotation measurement is also carried out at the same time.
- the flat design is not significantly affected by the integration of the angle sensor in the power wrench, so that direct measurement can be carried out even in extremely confined spaces. It has been found that the combination measurement of torque and angle of rotation enables the most precise tightening method for highly sensitive screw connections.
- the angle sensor is preferably arranged in a cap which encloses one end of the shaft. In this way, the angle sensor is protected against mechanical damage and contamination.
- the lateral expansion of the housing can be kept relatively small by the cap. Data can be transmitted through the cap, either with the aid of slip rings or by wireless transmission.
- FIG. 1 is a schematic side view of a first embodiment of the power wrench, partly in section,
- Fig. 3 shows a section through a second embodiment in which the measuring portion is disposed outside of the shaft ⁇
- FIG. 4 shows a section through a third embodiment in which the measuring section is arranged inside the shaft
- 5 shows a section through a fourth embodiment, in which the shaft is coupled to the key nut via an intermediate shaft
- 6 shows a fifth embodiment, in which the measuring section is arranged in a tubular part of the key nut
- FIG. 7 shows a sixth embodiment in which the measuring section is arranged on the outside of a tubular part of the key nut
- FIG. 8 shows a seventh exemplary embodiment in which the measuring section is arranged in a tubular part of the key nut, which in turn is connected to an intermediate shaft, and
- FIG. 9 shows a version similar to FIG. 8, but with the measuring section arranged on the outside.
- the power wrench according to FIGS. 1 and 2 has a drive part 10 and a functional part 11.
- the drive part 10 is exchangeably attached to the functional part 11.
- the drive part 10 contains a hydraulic cylinder (not shown) in which a piston is displaceable.
- the drive part 10 has a pivotable connection device 13 for hydraulic hoses on the cylinder housing 12.
- the functional part 11 has a housing 14, which here consists of two assembled housing halves 14a and 14b.
- a ratchet lever (not shown) can be pivoted back and forth by the drive part 10.
- a shaft 17 is rotatably supported in a transverse bore 16 which extends through the housing 14.
- This shaft 17 has in the interior of the housing 14 a circumferential toothing 18, in which a toothing of the ratchet lever engages. This way everyone will Stroke of the drive part 10 rotates the shaft 17 by a certain angular amount about its axis. Then the ratchet lever returns, in which the shaft 17 is not taken along.
- the shaft 17 has a driving device 20, which is designed here as a key socket 40 and forms an insertion recess 21 of hexagonal cross section.
- the insertion recess 21 is located in the part of the shaft 17 protruding from the housing 14 and extends into the housing 14. In this way, the part of the shaft protruding from the housing can be kept relatively short.
- the insertion recess 21 merges into a cavity 22 which is formed in the shaft 17.
- the torsion sensor 23 is located on the peripheral wall of the cavity 22 in the form of strain gauges which are glued to the peripheral wall. Between the insertion recess 21 and the cavity 22 there is an inwardly projecting ring flange 24 which protects the torsion sensor 23 against external interference.
- the area of the shaft 17 which carries the torsion sensor 23 forms the measuring section 25.
- the cavity 22 forms an axial extension of the insertion recess 21.
- the insertion recess 21 can have a relatively small axial length.
- the insertion recess can also serve to receive the shank of a key nut or be designed as a square opening.
- Adjacent to the cavity 22 is a frustoconical transition 26, which opens into a receiving space 27 in which a data transmission element 28 is contained.
- a cable channel 29 extends from the torsion sensor 23 to the data transmission element 28.
- the data transmission element 28 is for example a slip ring arrangement, which connects an external cable 30 to the torsion sensor 23, which is rotatable with the shaft 17. Alternatively, the transmission can also take place wirelessly.
- the cable 30 leads to a cable connection 31 (FIG. 1) which is provided on a cantilever arm 32 of the housing 14 and to which a control or measuring device can be connected.
- the hydraulic power wrench is also equipped with a rotary, angle measuring device 33.
- This has a code disk 34, which is fastened on the end of the shaft 17 facing away from the insertion recess 21, and an angle sensor 35, which reacts to the lines of the code disk 34 ' and thereby determines the angle of rotation of the shaft.
- the angle sensor 35 consists of a fork light barrier into which the code disk 34 protrudes radially from the shaft.
- the angle sensor 35 is contained in a cap 36 which is placed on part of the housing 14 and fastened with screws 37.
- the cap 36 encloses the rear end of the shaft 17 facing away from the insertion recess 21 and at the same time forms a protective housing for this shaft end and the angle measuring device 33.
- a cable 38 leads from the angle sensor 35 to the cable connection 31, so that both the torsion sensor 23 and the Angle sensor 35 is electrically accessible at the cable connection 31.
- the drive part 10 and the functional part 11 are each designed in the same way as is shown in FIGS. 1 and 2 has been described.
- the power transmission from the shaft to the key nut is different, as explained below.
- the shaft 17 is arranged over its entire length in the housing.
- a driving device 20a in the form of a spline toothing, which engages with a corresponding external toothing of a key nut 40.
- the key nut 40 has a hexagonal insertion recess 21 in a widened head 41.
- the head 41 extends partially into the housing 14.
- a hollow shaft 42 connects to the head 41.
- This hollow shaft has an external spline toothing which engages with the driving device 20a of the shaft 17. Between this external spline and the head 41 there is a measuring section 25 with a torsion sensor 23, which is arranged sunk in the annular groove of the hollow shaft 42.
- the drive torque is transmitted from the shaft 17 to the hollow shaft 42 and from there via the measuring section 25 to the head 41 of the key nut 40.
- even part of the head 41 is sunk in the housing 14, so that the axial length of the power wrench can be kept extremely short.
- FIG. 4 corresponds to that of FIG. 3, but with the difference that the torsion sensor 23 is arranged on the inside of the hollow shaft 42. Electrical Connection cables can be routed very easily through the hollow shaft to the torsion sensor.
- the shaft 17 protrudes toward the rear end from the housing 14. On the protruding part, it is provided on the inside with a spline toothing 20a, which engages with a corresponding driving device 20a on the outside of an intermediate shaft 44.
- the intermediate shaft extends up to the front through the housing 14 and it has internal spline teeth 45 in its front area and a bearing bore 46 in its rear area.
- the key nut 40 has a head 41 with an insertion recess 21.
- a hollow shaft 42 adjoins this head, on which a spline section is provided which engages with the spline teeth 45 of the intermediate shaft 44.
- a hollow shaft section 47 adjoins the hollow shaft 42 and is mounted in the bearing bore 46.
- the measuring section 25, with the torsion sensor 23 fastened in an outer groove of the intermediate shaft 44, is located in the area between the two spline toothings 20a and 45.
- key nuts 40 of different wrench sizes can be inserted into the intermediate shaft, even the largest wrench sizes being possible.
- the torsion sensor 23 can also be modified such that the torsion sensor 23 is contained in a recess on the inner wall of the intermediate shaft 44.
- 6 shows an exemplary embodiment in which the key socket 40 is connected to a hollow shaft 42 which engages in an inner driving device 20a of the shaft 17.
- the shaft 17 extends across the width of the housing 14, but does not project significantly beyond it.
- the key socket 40 forms a structural unit with the hollow shaft 42, which can be pulled out of the shaft 17 as a whole.
- the measuring section 25 is located on the key socket 40, specifically in the area between the insertion recess 21 and the hollow shaft 42.
- Electrical wires 48 extend from the torsion sensor 23 through the hollow shaft to a data transmission element 28, which is in the same manner as in FIG. 2 is arranged, but is located here inside the hollow shaft 42.
- the power wrench is equipped with a rotation angle measuring device 33, which has a code disk 34 seated on the hollow shaft 42 and an angle sensor 35 fixed to the housing.
- FIG. 7 differs from that of FIG. 6 only in that the torsion sensor 23 is arranged on the outside of the measuring section 25.
- a bore 46 leads through the hollow shaft 42 to lead the cables coming from the torsion sensor 23 into the interior of the hollow shaft.
- FIG. 8 shows an exemplary embodiment in which the key socket 40 is extended with a hollow shaft 42 which contains a measuring section 25, the torsion sensor 23 being arranged in the interior of the hollow shaft 42.
- the hollow shaft 42 is connected to an intermediate shaft 49 which engages in an inner driving device 20a of the shaft 17.
- the cable coming from the torsion sensor 23 passes through the intermediate shaft 49 in order to emerge from the rear.
- the embodiment of FIG. 9 differs from that of FIG. 8 only in that the torsion sensor 23 is arranged on the outside of the measuring section 25. From there, a bore 46 leads into the interior of the hollow shaft 42.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09168184.1A EP2113341B1 (en) | 2001-07-07 | 2002-07-03 | Pneumatic electric screwdriver |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE20111326U DE20111326U1 (en) | 2001-07-07 | 2001-07-07 | Hydraulic power wrench |
DE20111326U | 2001-07-07 | ||
DE20112833U DE20112833U1 (en) | 2001-07-07 | 2001-08-02 | Pressure operated power wrench |
DE20112833U | 2001-08-02 | ||
PCT/EP2002/007357 WO2003006208A1 (en) | 2001-07-07 | 2002-07-03 | Pressure-operated power screwdriver having a measuring section |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09168184.1A Division EP2113341B1 (en) | 2001-07-07 | 2002-07-03 | Pneumatic electric screwdriver |
EP09168184.1 Division-Into | 2009-08-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1404491A1 true EP1404491A1 (en) | 2004-04-07 |
EP1404491B1 EP1404491B1 (en) | 2011-06-08 |
Family
ID=26057087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02754816A Expired - Lifetime EP1404491B1 (en) | 2001-07-07 | 2002-07-03 | Pressure-operated power screwdriver having a measuring section |
Country Status (4)
Country | Link |
---|---|
US (1) | US7021179B2 (en) |
EP (1) | EP1404491B1 (en) |
JP (1) | JP4282476B2 (en) |
WO (1) | WO2003006208A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060243464A1 (en) * | 2005-04-29 | 2006-11-02 | Sdgi Holdings, Inc. | Torque and angular rotation measurement device and method |
SE531646C2 (en) * | 2007-10-17 | 2009-06-16 | Atlas Copco Tools Ab | Screwdriver with means for monitoring a reaction arm |
CN102759308B (en) * | 2011-04-26 | 2016-12-14 | Asm自动化传感器测量技术有限公司 | There is the measurement ring of tape measure and for the method arranging tape measure |
KR101318901B1 (en) * | 2013-04-29 | 2013-10-16 | 이종한 | Jig for testing torque of nut and method for manufacturing the jig |
CN103495861B (en) * | 2013-10-21 | 2016-01-27 | 成都凯恩机电设备有限公司 | The implementation method of bolt fastening system |
JP6461164B2 (en) * | 2013-12-27 | 2019-01-30 | アトラス・コプコ・インダストリアル・テクニーク・アクチボラグ | Power tools |
DE102015103903B4 (en) * | 2015-03-17 | 2024-04-11 | Juko Technik Gmbh | Power wrench with direct angle and/or torque measurement |
KR102414904B1 (en) * | 2020-04-17 | 2022-07-01 | (주)볼팅마스타 | Hydraulic torque wrench |
EP4229378A1 (en) * | 2020-10-15 | 2023-08-23 | Enerpac Tool Group Corp. | Load measurement system for hydraulic torque wrench |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49127300A (en) * | 1973-04-06 | 1974-12-05 | ||
FR2256803A1 (en) * | 1974-01-03 | 1975-08-01 | Abdellatif Ala | Tool for turning car wheel nuts - has socket spanner in pinned triangle with hydraulic jack as one arm |
DE3468358D1 (en) * | 1983-08-09 | 1988-02-11 | Staiger Mohilo & Co Gmbh | Ratchet wrench for driving screws |
JPS61100377A (en) * | 1984-10-22 | 1986-05-19 | ジヨン ケイ ユンカ−ス | Fluid pressure wrench |
US4794826A (en) * | 1986-01-27 | 1989-01-03 | Franks Neal S | Hydraulic powered wrench |
US4796492A (en) * | 1988-05-20 | 1989-01-10 | Liou Mou Tang | Clutch type socket wrench |
DE3922860A1 (en) * | 1989-07-12 | 1991-01-17 | Bosch Gmbh Robert | MEASURING DEVICE FOR DETERMINING TORQUE |
JPH03264271A (en) * | 1990-03-14 | 1991-11-25 | Hitachi Ltd | Torque value control bolt automatic tightening device |
JP3066102B2 (en) * | 1991-05-27 | 2000-07-17 | 株式会社東日製作所 | Bolt fastening tool that can measure bolt axial force |
AU667627B2 (en) * | 1993-01-22 | 1996-03-28 | John K. Junkers | Socket for turning a threaded connector by power tool |
JP3000185B2 (en) * | 1993-04-21 | 2000-01-17 | 株式会社山崎歯車製作所 | Bolt fastening method using impact wrench |
KR100335283B1 (en) * | 1993-06-04 | 2002-11-25 | 가부시키가이샤 후지킨 | Fastening device |
JPH09285973A (en) * | 1996-04-19 | 1997-11-04 | Shibaura Eng Works Co Ltd | Fastening device |
DE29607207U1 (en) * | 1996-04-20 | 1997-08-21 | Wagner, Paul-Heinz, 53804 Much | Hydraulic power wrench |
JPH1177555A (en) * | 1997-09-05 | 1999-03-23 | Teac Corp | Torque wrench |
US6298752B1 (en) * | 1999-06-25 | 2001-10-09 | John K. Junkers | Continuous fluid-operated wrench |
-
2002
- 2002-07-03 JP JP2003512002A patent/JP4282476B2/en not_active Expired - Lifetime
- 2002-07-03 WO PCT/EP2002/007357 patent/WO2003006208A1/en active Application Filing
- 2002-07-03 EP EP02754816A patent/EP1404491B1/en not_active Expired - Lifetime
- 2002-07-03 US US10/483,051 patent/US7021179B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03006208A1 * |
Also Published As
Publication number | Publication date |
---|---|
US7021179B2 (en) | 2006-04-04 |
JP4282476B2 (en) | 2009-06-24 |
EP1404491B1 (en) | 2011-06-08 |
WO2003006208A1 (en) | 2003-01-23 |
JP2004533939A (en) | 2004-11-11 |
US20040187650A1 (en) | 2004-09-30 |
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