EP2954982A1 - Tournevis électrique de verrouillage à deux crans - Google Patents

Tournevis électrique de verrouillage à deux crans Download PDF

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Publication number
EP2954982A1
EP2954982A1 EP14171677.9A EP14171677A EP2954982A1 EP 2954982 A1 EP2954982 A1 EP 2954982A1 EP 14171677 A EP14171677 A EP 14171677A EP 2954982 A1 EP2954982 A1 EP 2954982A1
Authority
EP
European Patent Office
Prior art keywords
torque
electric screwdriver
clutch
unit
motor
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.)
Withdrawn
Application number
EP14171677.9A
Other languages
German (de)
English (en)
Inventor
Hsiu-Lin Hsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mijy-Land Industrial Co Ltd
Mijy Land Ind Co Ltd
Original Assignee
Mijy-Land Industrial Co Ltd
Mijy Land Ind Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mijy-Land Industrial Co Ltd, Mijy Land Ind Co Ltd filed Critical Mijy-Land Industrial Co Ltd
Priority to EP14171677.9A priority Critical patent/EP2954982A1/fr
Publication of EP2954982A1 publication Critical patent/EP2954982A1/fr
Withdrawn legal-status Critical Current

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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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • 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
    • B25B23/141—Mechanical overload release couplings

Definitions

  • the present invention relates generally to an innovative electric screwdriver, and more particularly to a two-stage locking electric screwdriver with external torque modulation, featuring convenient modulation, accurate torque, lower power consumption and minimal number of parts.
  • SCHATZ is a company with more than 50 years of technical experience and has long been engaged in the development of solutions for assembly and quality assurance of various bolts.
  • the company has set a benchmark for the industry, and its technological level has become national or even international standards and guidelines;
  • Doctor Volker Schatz authored a book named 10 Steps for Reliable Bolted Assembly, which described in detail 10 steps affecting all factors in the process of assembly, and analyzed the causal relationship affecting the bolt connecting and fastening quality.
  • These 10 steps can be made into a step-by-step examination chart to monitor perfectness of the methods utilized during the process of bolt connecting and fastening.
  • these 10 steps can also be used in formulating guidelines reflecting state-of-the-art quality control systems and standards. Based on the guide of this book, the locking quality assurance can be enhanced to the top level meeting all current standards and methods.
  • each bolt fastening operation to assemble the components shall have a guideline to indicate the fastening steps and the measurement data to be used.
  • the parameters for each assembly step shall be calculated based on an abstract model. Due to the abstract model, these parameters are only an approximation of real conditions.
  • the assumptions and estimations provided here can be used as the basis for the design of fastener connection.
  • those charts, standards and testing results often cannot reflect the factors influencing the assembly, while the results are often used as the basis for the assembly operations.
  • FIG. 2 (A), (B) the multi-functional bolt fastening analysis system in the German Schatz Laboratory analyzed the performance of the screw (bolt) based on different locking objects.
  • FIG. 2 (A) depicts the performance of the bolt when locking a material thinner than the length of the bolt.
  • FIG. 2 (B) depicts the perforce of the bolt when installed on a material thicker than the length of the bolt.
  • FIG. 2 (B) means that, when the screw (bolt) is rotated in a very instant torque to reach the locking status, even if the torque is maintained within the tolerance range, the locking operation is actually incomplete and the screw (bolt) is not properly installed.
  • FIG. 2 (A) means that, in the case of a two-stage locking, the situation occurred in FIG. 2 (B) can be avoided, and the screw (bolt) locking is properly installed and completely tightened.
  • the torsion spring is configured inside (i.e., between the coupling shaft and the torque tube), and is enclosed by a torque sheath.
  • a specially designed torque wrench or tool
  • the torque can no longer be adjusted;
  • the internal torque modulation is not easily realized, it has such an advantage that: when the motor is started, the no-load current will not be affected by the torque of the clutch. Hence, it is energy-efficient.
  • the torsion spring is also configured inside, but there is an external torque modulating ring (mostly commonly seen in the market). In operation, it can be directly modulated by hand and is therefore very convenient; but the shortcoming is: when the motor is started, the no-load current will vary depending on the modulated torque. Hence it consumes more power.
  • an ordinary electric screwdriver at least includes a gear unit, a clutch unit and a screwdriver head unit.
  • the motor drives the gear unit, and the gear unit drives the clutch unit and screwdriver head unit to operate. This will increase the rotational weight and will consume more power.
  • the primary objective of the present invention is to provide a two-stage locking electric screwdriver, which, based on the design of an internal gear clutch with staggered internal teeth and interlaced cams, the inner ring orbit of the cam can firstly provide a torque for pre-locking, and during operation, when the cams on the inner and outer ring orbits interlace, a maximum torque will be generated for a perfect locking effect.
  • the second objective of the present invention is to provide a two-stage locking electric screwdriver, through which the torque can be directly modulated and the torsion spring can be replaced timely to substantially enhance the torque accuracy.
  • the third objective of the present invention is to provide a two-stage locking electric screwdriver, so as to dramatically reduce the number of parts to produce the electric screwdriver, and to reduce production cost and save power.
  • the electric screwdriver has a matching external enclosure, and inside the enclosure, it at least includes: a motor unit, to provide power source; a clutch unit, coupled with and driven by the motor, the clutch unit has power transmission and speed shifting functions, and can provide two-stage torque output; a screwdriver head unit, driven by the clutch unit, and can be fitted with various screwdriver heads; a trigger unit, to control the starting of the motor of the electric screwdriver, and meanwhile has a function to avoid button reset; and a controller unit, with a built-in micro-controller unit (MCU) panel, and a power source to supply required power.
  • MCU micro-controller unit
  • Said motor unit further includes: a motor, an accelerator/supercharger, and the spin axis for motor power output has an accelerator/supercharger going through it.
  • Said motor is preferentially a brushless motor.
  • Said accelerator/supercharger includes one or more than one bearing (or sleeve) with certain proportional weight and is made of metallic material.
  • Said clutch unit further includes: an internal gear clutch, a lower clutch, a coupling shaft, a torque tube, a torsion spring, and a torque sheath;
  • the internal gear clutch is in the form of a planetary gear, with one side bound with a gear and a gear disc, and coupled with and driven by the spin axis of the motor, and with the other side configured with a pair of interlaced (inner and outer ring) planetary orbits, and with design of cam surface on the planetary orbits formed by interlaced projecting portions.
  • Steel balls are provided on the pair of planetary orbits. The cam surfaces of the lower clutch and the internal gear clutch contact each other.
  • the coupling shaft goes through the lower clutch and one of its ends is linked to and moves along with the planetary gear of the internal gear clutch.
  • the other end of the coupling shaft is provided with a torque tube, and the torque tube has a going-through torsion spring, and is further covered by a torque sheath.
  • Said screwdriver head unit has an inside connecting shaft, linked with and moving along with the coupling shaft inside the clutch unit.
  • the connecting shaft has a binding cleft to fit various screwdriver heads, with three steel balls inside the cleft for clamping and positioning.
  • the inside shape of said binding cleft can be of any geometric shape, such as round, square or polygon.
  • Said power source can be a rechargeable battery.
  • Said electric screwdriver further includes a torque adjusting wrench.
  • the electric screwdriver 1 is rechargeable, with a matching external enclosure 10.
  • the enclosure 10 can be in any type, such as upright type, or gun type etc.
  • the present embodiment takes the gun type as an example.
  • the motor unit 20 further includes: a motor 21, an accelerator/supercharger 22.
  • the motor 21 is preferably but not limited to a brushless motor, and the power outputting spin axis 211 has a going-through accelerator/supercharger 22, which includes one or more than one bearing (or sleeve) with certain proportional weight and is made of metallic material; in actual application, the accelerator/supercharger 22 is configured on the power outputting spin axis 211 of the motor 21, for the effect of slow start and accelerated running.
  • the power of the motor can be doubled with minimal electricity consumption. Consequently, the time used to lock the screw can be shortened and working efficiency improved.
  • the clutch unit 30 further includes: an internal gear clutch 31, a lower clutch 32, a coupling shaft 33, a torque tube 34, a torsion spring 35, and a torque sheath 36;
  • the internal gear clutch 31 is in the form of a planetary gear, with one side bound with a gear 311 and a gear disc (312), and coupled with and driven by the spin axis of the motor 21, and with the other side configured with a pair of interlaced (inner and outer ring) planetary orbits, and with design of cam surface on the planetary orbits formed by interlaced projecting portions 371.
  • Steel balls 372 are provided on the pair of planetary orbits. The cam surfaces of the lower clutch 32 and the internal gear clutch 31 contact each other.
  • the coupling shaft 33 goes through the lower clutch 32 and one of its ends is linked to and moves along with the planetary gear of the internal gear clutch 31. Based on this, the power transmission and speed changing of the motor 21 can be improved.
  • the other end of the coupling shaft 33 is provided with a torque tube 34, and the torque tube 34 has a going-through torsion spring 35, and is further covered by a torque sheath 36. Based on this, the required torque value can be set, and the user can freely modulate the torque value as needed after removing the torque sheath 36, or even replace the torsion spring 35 to enhance the screw locking precision and quality.
  • the cam surface 37 of the internal gear clutch 31 is depicted in FIG. 5 .
  • the cam surface 37 has inner and outer ring planetary orbits, and the inner and outer ring orbits are configured on appropriate positions with: two corresponding projecting portions 371, respectively contacting the edges of the inner and outer ring planetary orbits, and the two projecting portions 371 have different shapes, and two steel balls 372, respectively circulating on the inner and outer ring planetary orbits without affecting each other.
  • the screwdriver head unit 40 has a connecting shaft 41 configured inside, which is axially linked with and moves along with the coupling shaft 33 inside the clutch unit 30;
  • the connecting shaft 41 mainly has a binding cleft 411 for various screwdriver heads 42 to be inserted into.
  • the inside shape of the binding cleft 411 can be in any geometric shape to match the connecting end shapes of existing common screwdriver heads, such as round, square, polygon etc, with no limit.
  • three steel balls 412 are provided for clamping and positioning, so that the screwdriver head 42 can be synchronously and stably fixed.
  • the trigger unit 50 is to control the start of the electric screwdriver 1, and meanwhile has a function to avoid button reset.
  • the controller unit 60 with a built-in micro-controller unit (MCU) panel 61, and a power source 62 to supply required power.
  • MCU micro-controller unit
  • a power source is not limited to this.
  • FIG. 5 (A) depicts the respective actions of the cam surface 37 and two steel balls 372 of the internal gear clutch 31; wherein the two projecting portions 371 respectively configured on the inner and outer ring planetary orbits have upper dead point and lower dead point to constitute continuous stroke cycles.
  • the stroke cycle at least includes the following stroke stages: FIG. 5 (A) depicts the first stroke, to control the torque of the electric screwdriver, with an outer R angle design, here, the steel ball 372 on the outer ring has entered into the outer R angle of the projecting portion 371 on the outer ring; FIG.
  • FIG. 5 (B) depicts the second stroke, for the pre-locking function, here, the steel ball 372 on the outer ring has been pushed into a horizontal stroke, and meanwhile the steel ball 372 on the inner ring has entered into the outer R angle of the projecting portion 371 on the inner ring, and at this time a torque value is obtained;
  • FIG. 5 (C) depicts the third stroke, here the steel ball 372 on the outer ring has travelled to the end of the parallel, while the steel ball 371 on the inner ring continues to climb the projecting portion 371 on the inner ring;
  • FIG. 5 (D) depicts the fourth stroke, here the steel balls 372 on the inner and outer rings have both climbed to the highest upper dead points of the projecting portions 371, at this time, a maximum torque value is generated;
  • FIG. 5 (E) depicts the fifth stroke, the steel ball 372 on the outer ring quickly falls to the highest lower dead point, and meanwhile the steel ball 372 on the inner ring slowly falls to the highest lower dead point, and the locking is completed by now.
  • the corresponding angles of the two projecting portions can be altered.
  • the two projecting portions 371 on the inner and outer ring planetary orbits are positioned on the same diameter line, if the angle of the projecting portion 371 on the inner ring is offset clockwise, the included angle with the projecting portion 371 on the outer ring will be reduced, and the rotational speed will slow down; if the angle of the projecting portion 372 on the inner ring is offset counter-clockwise, the included angle with the projecting portion 371 on the outer ring will be enlarged, and the rotational speed will speed up;
  • This design will meet diversified locking needs.
  • the operational processes of torque modulation of the electric screwdriver of the present invention are as follow: loosen and take down the torque sheath 36, gently push in the torque adjusting wrench 70, rotate the torque adjusting wrench 70 clockwise to increase the torque, or counter-clockwise to reduce the torque, as required, after the modulation is completed, take out the torque adjusting wrench 70, and at last screw in the torque sheath 36, and make sure it is back to the original correct position.
  • the electric screwdriver of the present invention is an external torque modulation type, and its torque modulation can be easily operated. Comparing to existing internal torque modulation types, it is more advanced and has better torque accuracy.
  • the electric screwdriver of the present invention is made up of less number of parts when comparing to existing electric screwdrivers with a gear unit and a clutch unit, and therefore it will help reduce manufacturing cost and speed up assembly; Meanwhile, due to the reduced number of parts, when using the electric screwdriver, the reduced rotational weight can help the motor to drive the screwdriver more easily, and save electricity.
  • FIG. 7 is a reflection of the locking process of an ordinary electric screwdriver on a dynamic torque testing machine
  • FIG. 7 is a reflection of the two-stage locking electric screwdriver of the present invention, and clearly shows that the process is made up of a first stage locking (i.e., pre-locking) and a second stage locking.
  • a first stage locking i.e., pre-locking
  • a second stage locking This indicates that the two-stage locking process reflected by the dynamic torque testing machine right corresponds to the so-called perfect locking defined by Schatz in his book.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP14171677.9A 2014-06-09 2014-06-09 Tournevis électrique de verrouillage à deux crans Withdrawn EP2954982A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14171677.9A EP2954982A1 (fr) 2014-06-09 2014-06-09 Tournevis électrique de verrouillage à deux crans

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14171677.9A EP2954982A1 (fr) 2014-06-09 2014-06-09 Tournevis électrique de verrouillage à deux crans

Publications (1)

Publication Number Publication Date
EP2954982A1 true EP2954982A1 (fr) 2015-12-16

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ID=50979538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14171677.9A Withdrawn EP2954982A1 (fr) 2014-06-09 2014-06-09 Tournevis électrique de verrouillage à deux crans

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2777216A1 (fr) * 1998-04-14 1999-10-15 Ass Leonard De Vinci Machine porte-outils a entrainement rotatif sans reaction de couple
US20110139478A1 (en) * 2009-12-15 2011-06-16 Jens Brennenstuhl Hand-held power tool
US20110232933A1 (en) * 2008-10-10 2011-09-29 Makita Corporation Electrical power tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2777216A1 (fr) * 1998-04-14 1999-10-15 Ass Leonard De Vinci Machine porte-outils a entrainement rotatif sans reaction de couple
US20110232933A1 (en) * 2008-10-10 2011-09-29 Makita Corporation Electrical power tool
US20110139478A1 (en) * 2009-12-15 2011-06-16 Jens Brennenstuhl Hand-held power tool

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