WO2021088530A1 - Mécanisme de déclenchement de marteau électrique - Google Patents

Mécanisme de déclenchement de marteau électrique Download PDF

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Publication number
WO2021088530A1
WO2021088530A1 PCT/CN2020/116121 CN2020116121W WO2021088530A1 WO 2021088530 A1 WO2021088530 A1 WO 2021088530A1 CN 2020116121 W CN2020116121 W CN 2020116121W WO 2021088530 A1 WO2021088530 A1 WO 2021088530A1
Authority
WO
WIPO (PCT)
Prior art keywords
tripping
electric hammer
pressure plate
intermediate shaft
trip
Prior art date
Application number
PCT/CN2020/116121
Other languages
English (en)
Chinese (zh)
Inventor
段家利
邱国富
Original Assignee
苏州宝时得电动工具有限公司
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 苏州宝时得电动工具有限公司 filed Critical 苏州宝时得电动工具有限公司
Publication of WO2021088530A1 publication Critical patent/WO2021088530A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit

Definitions

  • the utility model belongs to the technical field related to electric hammers, and particularly relates to an electric hammer tripping mechanism.
  • the electric hammer is an electric rotary hammer drill with a safety clutch attached with a pneumatic hammer mechanism. It is composed of motor, gear reducer, impact mechanism, drilling mechanism, overload safety clutch protection device, etc.
  • the electric hammer generally has two functional modes, one is the impact mode (hammer mode) that outputs linear reciprocating motion, and the other It is a drill mode that outputs rotary motion.
  • the electric hammer can also realize the hammer drill mode with both impact and rotation.
  • the steel ball extruded from the transmission gear can press the tripping fixing plate to compress the tripping inner spring and the tripping outer spring to move down, so as to separate the transmission gear from the tripping fixing plate.
  • the above-mentioned electric hammer overload protection tripping device can effectively solve the tripping of the electric hammer under overload or locked-rotor operation.
  • the end of the intermediate shaft 10 of the tripping device has a bevel gear 20
  • the transmission gear 30 is arranged on the intermediate shaft 10
  • the upper pressure plate 102 is located on the upper side of the transmission gear 30, and the trip is fixed.
  • the plate 40 is arranged on the lower side of the steel ball 101 and the upper side of the elastic member 60 in the transmission gear 30; referring to the right half of FIG. 1, in the process of tripping, the tripping fixing plate 40 overcomes the elasticity under the action of the steel ball 101
  • the member 60 slides along the axial direction by elastic force, thereby causing a trip with the steel ball 101.
  • the above-mentioned electric hammer tripping mechanism is adopted. Since the lower end of the tripping pressure plate is provided with a compression spring, there may be skew when the tripping pressure plate slides down, resulting in unstable tripping torque and affecting normal use. If the tripping force value changes If it is too large, there may be a risk of injury.
  • the electric hammer tripping mechanism includes an intermediate shaft, a transmission gear sleeved on the intermediate shaft, a trip pressure plate, and a washer fixedly arranged relative to the intermediate shaft.
  • the trip pressure plate and the intermediate shaft are arranged without relative movement, so A trip assembly capable of moving relative to the trip pressure plate along the axial direction of the intermediate shaft is provided between the trip pressure plate and the washer, and the trip assembly includes at least one elastic member for providing tripping of the trip pressure plate The pressure required at the time.
  • the end of the intermediate shaft has a pinion gear
  • the trip pressure plate is arranged on the side of the transmission gear close to the pinion gear.
  • a plurality of through holes are provided on the transmission gear, and the trip assembly includes a coupling member at least partially accommodated in the through hole, and a pressure plate abutting against the coupling member, so The elastic member is arranged between the washer and the pressing plate.
  • the side surface of the trip pressing plate close to the transmission gear is provided with a first matching portion matching the shape of the coupling member, and an action portion for tripping and abutting with the coupling member.
  • the coupling member is configured as a steel ball
  • the first mating portion includes a plurality of first groove rails capable of accommodating a part of the steel ball
  • the action portion is configured to be located between two adjacent A track protrusion between the groove and the track
  • the elastic member is designed as a compression spring
  • a second mating portion that matches the shape of the connecting piece is provided on the side surface of the pressing plate close to the connecting piece.
  • the second mating portion is configured as a second groove track capable of accommodating a part of steel balls, and the second groove track forms a closed loop.
  • the trip pressure plate and the intermediate shaft are connected without relative movement through a coupling member, the intermediate shaft is provided with a first notch, and the trip pressure plate is provided with the first notch.
  • a notch corresponds to a second notch, and the coupling member is engaged between the first notch and the second notch.
  • the coupling member is set as a steel ball.
  • the utility model provides a safe and stable electric hammer.
  • the electric hammer includes a housing, a motor arranged in the housing, a chuck connected to one end of the housing, a rotary motion output mechanism that is connected to the armature shaft of the motor, and a motor that is connected to the armature shaft.
  • Impact motion output mechanism the impact motion output mechanism includes a cylinder arranged in the housing, a piston that reciprocates in the cylinder, a hammer that transmits impact power through an air cushion under the push of the piston, and a Hammering the striker of the working head clamped in the chuck, the rotational motion output mechanism is used to transmit the rotational motion of the motor to the working head clamped in the chuck; the rotational motion output mechanism includes the aforementioned electric Hammer trip mechanism.
  • the electric hammer tripping mechanism provided by the utility model connects the tripping pressure plate and the intermediate shaft by means of steel balls, keys or tight fitting, etc., so that there is no relative movement between the two, so that the tripping pressure plate is one at the time of tripping.
  • the stable base will not cause the fluctuation of the tripping force value, thereby improving the reliability of the tripping, and avoiding the risk of injury to the user when the torque becomes larger during use.
  • Fig. 1 is a structural schematic diagram of the working state and the tripping state of the tripping structure when the electric hammer in the prior art works normally.
  • Figure 2 is a schematic diagram of the internal structure of the electric hammer provided by the utility model.
  • Fig. 3 is a three-dimensional exploded schematic diagram of the electric hammer tripping mechanism in Fig. 2.
  • FIG. 4 is a three-dimensional schematic diagram of the trip pressure plate in FIG. 5.
  • Fig. 5 is a schematic cross-sectional view of the structure of the electric hammer tripping mechanism marked A in Fig. 2 in a non-tripping state.
  • FIG. 6 is a schematic cross-sectional view of the structure of the electric hammer tripping mechanism marked A in FIG. 2 in a tripping state.
  • the present utility model provides an electric hammer 200.
  • the electric hammer 200 includes a housing 210, a motor 202 erected in the housing, the motor 202 having an armature shaft 204 that outputs rotational motion, and an armature shaft 204 is connected to the rotary motion output mechanism, and the armature shaft 204 is connected to the impact motion output mechanism.
  • the impact motion output mechanism is used to convert the rotational motion of the armature shaft 204 to output linear reciprocating motion through motion conversion.
  • the impact motion output mechanism includes a cylinder 400 arranged in the housing 210, a piston 410 that reciprocates in the cylinder 400, and a ram 420 that reciprocates under the action of an air cushion 412 through the piston 410.
  • the ram 420 is used for impact and impact.
  • the rod 430 and the striker rod 430 transmit the impact force to the working head 510 clamped in the chuck 500.
  • the rotary motion output mechanism is used to transmit the rotary motion of the armature shaft 204 to the chuck 500 to drive the working head 500 clamped in the chuck to rotate.
  • An armature shaft gear 204a is provided at the end of the armature shaft 204, and the rotational motion output mechanism includes an electric hammer tripping mechanism 100 mated with the armature shaft gear 204a.
  • the electric hammer tripping mechanism 100 includes an intermediate shaft 110.
  • the end of the intermediate shaft 110 close to the cylinder 400 is provided with a pinion gear 120.
  • the pinion gear 120 can be set as a bevel gear, and the bevel gear can be
  • the intermediate shaft 110 is integrally formed or arranged separately for meshing with the large gear 122 sleeved in the cylinder 400; wherein the large gear 122 can be configured as a bevel gear correspondingly, and the large gear 122 can slide with a spline arranged relative to the cylinder 400
  • the sleeve 402 is engaged for transmission, and the spline sleeve 402 and the cylinder 400 are connected together by a spline structure without relative rotation;
  • the electric hammer tripping mechanism 100 also includes a transmission gear 130 sleeved on the intermediate shaft 110 and located close to the transmission gear 130
  • the trip pressure plate 140 on the side of the pinion 120 and the washer 150 fixed to the intermediate shaft 110
  • the elastic member in this embodiment is set as a compression spring 160 for providing the pressure required for the tripping pressure plate 140 to trip.
  • the armature shaft gear 204a meshes with the transmission gear 130 for transmission, and the washer 150 is fixed on the upper intermediate shaft 110 through a clamp ring 170.
  • the compression spring 160 can be configured as a cylindrical compression spring or a conical compression spring, and can also be replaced by other elastic members.
  • a number of through holes 131 are provided on the transmission gear 130, and the trip assembly includes a coupling at least partially received in the through hole 131, and a pressure plate 155 abutting against the coupling; a compression spring 160 is provided between the washer 150 and the pressure plate 155 between.
  • the coupling member of this embodiment is set as a steel ball 103, and the steel ball 103 is partially received in the through hole 131; the pressure plate 155 is provided on the side of the transmission gear 130 away from the bevel gear 120.
  • the release plate 140 is provided with a central hole 141 and a plurality of first notches 142 communicating with the central hole 141.
  • a number of second notches 112 are provided on the intermediate shaft 110, and the trip pressing plate 140 and the intermediate shaft 110 are connected by a coupling without relative movement.
  • the coupling member in this embodiment is set as a steel ball 101, and the steel ball 101 is respectively engaged with the first notch 142 and the second notch 112, thereby connecting the intermediate shaft 110 and the trip pressure plate 140 together without relative movement.
  • Relative movement includes no relative rotation or movement along the axial direction.
  • the steel ball 101 in this embodiment can be replaced with a key or other tight fitting methods, so that there is no relative movement between the intermediate shaft 110 and the trip pressure plate 140.
  • a first matching portion is provided for engaging with the steel ball 103 partially exposed in the through hole 131; in this embodiment, the first matching portion includes a plurality of arcs.
  • the groove track 144; and the action part for tripping and abutting with the coupling member, the action part is arranged as a track protrusion 146 located between adjacent groove tracks 144.
  • the side surface of the pressing plate 155 facing the transmission gear 130 is provided with a second mating part that matches the shape of the steel ball 103.
  • the second mating part is configured as a groove track 157 that can accommodate part of the steel ball 103.
  • the groove The track 157 forms a closed loop.
  • the intermediate shaft 110 drives the large gear 122 to rotate through meshing, and the large gear 122 passes through the side of the spline sleeve 402.
  • the spline 402a is connected to drive the spline sleeve 402 to rotate.
  • the spline sleeve 402 drives the cylinder 400, that is, the output shaft, to rotate through the inner circumferential spline 402b, and the output shaft drives the workpiece head 510 to rotate together through the key connection to complete the rotation.
  • the armature shaft gear 204a continues to rotate to drive the intermediate shaft transmission gear 130 to continue to rotate, and the transmission gear rotates relative to the trip pressure plate 140 at this time, driving the steel ball 103 to rotate along the groove track 157 of the trip pressure plate 140 and the pressure plate 155 ,
  • the steel ball 103 moves to the rail protrusion 146 of the trip pressure plate 140, it climbs the slope against the pressure of the compression spring 160, pushes the pressure plate 155 downwards, and compresses the compression spring 160 at the same time. After climbing, the steel ball 103 falls back and the pressure plate 155 returns to the initial position under the action of the compression spring 160 to complete a trip.
  • the electric hammer tripping mechanism provided by the present utility model is compared with the prior art, the electric hammer tripping mechanism 100 provided, the tripping pressing plate 140 and the intermediate shaft 110 are passed through steel balls 101, keys or tight fittings, etc. Connected so that there is no relative movement between the two, so that the tripping pressure plate 140 is a stable base when tripping, and will not cause the fluctuation of the tripping force value, thereby improving the reliability of the tripping and avoiding the user's There is a risk of injury due to increased torque during use.
  • 10 intermediate shaft; 20, bevel gear; 30, transmission gear; 40, trip pressure plate; 60, compression spring; 100, electric hammer trip mechanism; 101, steel ball; 102, upper pressure plate; 103, steel ball 110, intermediate shaft; 112, second notch; 120, pinion gear; 122, large gear; 130, transmission gear; 131, through hole; 140, tripping plate; 141, center hole; 142, first notch 144, groove track; 146, track protrusion; 150, gasket; 155, pressure plate; 157, groove track; 160, compression spring; 170, clamp ring; 200 electric hammer; 210, housing; 202, motor; 204.
  • Armature shaft; 204a armature shaft gear; 400, cylinder; 402, spline sleeve; 402a, spline; 402b, spline; 410, piston; 412, air cushion; 420, hammer; 430, striker bar ; 500, chuck; 510, working head;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

La présente invention concerne un mécanisme de déclenchement de marteau électrique (100) comprenant un arbre intermédiaire (110), un engrenage de transmission (130) agencé sur l'arbre intermédiaire d'une manière gainée, une plaque de pression de déclenchement (140) et un joint d'étanchéité (150) agencé de manière fixe par rapport à l'arbre intermédiaire, la plaque de pression de déclenchement et l'arbre intermédiaire étant agencés de manière à ne pas se déplacer l'un par rapport à l'autre, un ensemble de déclenchement pouvant se déplacer par rapport à la plaque de pression de déclenchement dans la direction axiale de l'arbre intermédiaire étant agencé entre la plaque de pression de déclenchement et le joint d'étanchéité, et l'ensemble de déclenchement comprenant au moins un ressort comprimé (160) qui est utilisé pour fournir une pression requise lors du déclenchement de la plaque de pression de déclenchement. Du fait de l'agencement de la plaque de pression de déclenchement et de l'ensemble de déclenchement, la plaque de pression de déclenchement constitue une base stable pendant le déclenchement, la fluctuation d'une valeur de force de déclenchement ne peut pas être provoquée, de sorte que la fiabilité de déclenchement est améliorée et le risque qu'un utilisateur ne soit blessé en raison de l'augmentation du couple dans le processus d'utilisation est évité. L'invention concerne en outre un marteau électrique (200) comprenant le mécanisme de déclenchement de marteau électrique.
PCT/CN2020/116121 2019-11-07 2020-09-18 Mécanisme de déclenchement de marteau électrique WO2021088530A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201921914847.5 2019-11-07
CN201921914847.5U CN211517390U (zh) 2019-11-07 2019-11-07 电锤脱扣机构以及电锤

Publications (1)

Publication Number Publication Date
WO2021088530A1 true WO2021088530A1 (fr) 2021-05-14

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Application Number Title Priority Date Filing Date
PCT/CN2020/116121 WO2021088530A1 (fr) 2019-11-07 2020-09-18 Mécanisme de déclenchement de marteau électrique

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Country Link
CN (1) CN211517390U (fr)
WO (1) WO2021088530A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3004991A1 (de) * 1980-02-11 1981-08-20 Hilti AG, 9494 Schaan Ueberlastkupplung zum uebertragen eines begrenzten drehmomentes
CA2498035A1 (fr) * 2002-09-13 2004-03-25 Black & Decker Inc. Outil tournant
CN200974231Y (zh) * 2006-11-20 2007-11-14 何乃镇 一种电锤钻
CN201120602Y (zh) * 2007-11-30 2008-09-24 王文江 电锤过载保护脱扣装置
JP2014147982A (ja) * 2013-01-31 2014-08-21 Hitachi Koki Co Ltd 過負荷スリップ装置及びこれを備える電動工具
CN204711997U (zh) * 2015-04-10 2015-10-21 苏州宝时得电动工具有限公司 电锤脱扣结构
CN205835224U (zh) * 2016-06-13 2016-12-28 浙江德世电器有限公司 一种电锤的钢球脱扣结构
CN206241972U (zh) * 2016-11-29 2017-06-13 浙江德世电器有限公司 一种电锤的钢柱脱扣结构
CN208246735U (zh) * 2018-03-08 2018-12-18 苏州宝时得电动工具有限公司 电锤脱扣结构
CN110125878A (zh) * 2018-02-02 2019-08-16 苏州宝时得电动工具有限公司 电锤及冲击机构

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3004991A1 (de) * 1980-02-11 1981-08-20 Hilti AG, 9494 Schaan Ueberlastkupplung zum uebertragen eines begrenzten drehmomentes
CA2498035A1 (fr) * 2002-09-13 2004-03-25 Black & Decker Inc. Outil tournant
CN200974231Y (zh) * 2006-11-20 2007-11-14 何乃镇 一种电锤钻
CN201120602Y (zh) * 2007-11-30 2008-09-24 王文江 电锤过载保护脱扣装置
JP2014147982A (ja) * 2013-01-31 2014-08-21 Hitachi Koki Co Ltd 過負荷スリップ装置及びこれを備える電動工具
CN204711997U (zh) * 2015-04-10 2015-10-21 苏州宝时得电动工具有限公司 电锤脱扣结构
CN205835224U (zh) * 2016-06-13 2016-12-28 浙江德世电器有限公司 一种电锤的钢球脱扣结构
CN206241972U (zh) * 2016-11-29 2017-06-13 浙江德世电器有限公司 一种电锤的钢柱脱扣结构
CN110125878A (zh) * 2018-02-02 2019-08-16 苏州宝时得电动工具有限公司 电锤及冲击机构
CN208246735U (zh) * 2018-03-08 2018-12-18 苏州宝时得电动工具有限公司 电锤脱扣结构

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