WO2014019519A1 - 钻夹头 - Google Patents

钻夹头 Download PDF

Info

Publication number
WO2014019519A1
WO2014019519A1 PCT/CN2013/080562 CN2013080562W WO2014019519A1 WO 2014019519 A1 WO2014019519 A1 WO 2014019519A1 CN 2013080562 W CN2013080562 W CN 2013080562W WO 2014019519 A1 WO2014019519 A1 WO 2014019519A1
Authority
WO
WIPO (PCT)
Prior art keywords
nut
locking
groove
drill chuck
drill
Prior art date
Application number
PCT/CN2013/080562
Other languages
English (en)
French (fr)
Inventor
乔文章
Original Assignee
山东威达机械股份有限公司
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 山东威达机械股份有限公司 filed Critical 山东威达机械股份有限公司
Priority to EP13826253.0A priority Critical patent/EP2837449B1/en
Priority to US14/400,706 priority patent/US9744601B2/en
Publication of WO2014019519A1 publication Critical patent/WO2014019519A1/zh

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02Chucks
    • B23B31/10Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/1207Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving obliquely to the axis of the chuck in a plane containing this axis
    • B23B31/123Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving obliquely to the axis of the chuck in a plane containing this axis with locking arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2231/00Details of chucks, toolholder shanks or tool shanks
    • B23B2231/38Keyless chucks for hand tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2260/00Details of constructional elements
    • B23B2260/022Balls
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S279/00Chucks or sockets
    • Y10S279/902Keyless type socket
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00Chucks or sockets
    • Y10T279/17Socket type
    • Y10T279/17615Obliquely guided reciprocating jaws
    • Y10T279/17623Threaded sleeve and jaw
    • Y10T279/17632Conical sleeve

Definitions

  • the present invention relates to the field of processing machinery, and in particular to a drill chuck.
  • BACKGROUND OF THE INVENTION Existing drill chucks have the function of extending the jaws to grip the tool and retracting the jaws to release the tool. To prevent the jaws from loosening during the clamping position, many drill chucks are also provided. The locking structure prevents the jaws from coming loose under working conditions. However, the locking structure of the existing drill chuck is relatively complicated.
  • the present invention is directed to a drill chuck that is simple in construction and that prevents loosening during operation.
  • a drill chuck comprising: a drill body having a plurality of oblique guide holes distributed along a circumferential direction; a plurality of jaws, one-to-one correspondingly inclined The hole is slidably disposed, the jaw has an externally threaded section; the outer sleeve is rotatably sleeved on the drill body; the nut is engaged with the jaw, and the outer sleeve is drivenly connected with the nut; the drill chuck further comprises: a locking The mechanism is located between the first thrust surface of the drill body and the nut, the locking mechanism comprises a locking disc and a locking ball, and the locking disc is provided with a plurality of chutes with a spiral angle on the end face of the nut.
  • the helix angle of the chute is smaller than the friction angle between the locking ball and the locking disc, and the locking ball is movably disposed along the chute.
  • the drill chuck further includes a silk sleeve, the silk sleeve is fixedly connected with the nut, and the outer sleeve is drivingly connected with the silk sleeve.
  • the front end of the silk sleeve has a driven member extending radially inward, and the rear end of the silk sleeve has an elastic pawl;
  • the front end of the outer sleeve has a driving groove matched with the driven member, and the driven member has a first position and a second position in the driving groove,
  • the rear end of the outer sleeve has a first groove and a second groove that cooperate with the elastic pawl, and the depth of the first groove is greater than the depth of the second groove, when When the driven member is in the first position, the elastic pawl is located in the first groove, and when the driven member is in the second position, the elastic pawl is located in the second groove;
  • the locking disk has ratchet teeth, when the elastic pawl When located in the second recess, the resilient pawl abuts the slot of the ratchet.
  • the locking mechanism further includes an elastic pad, the elastic pad being located between the first thrust surface of the drill body and the locking disk. Further, the locking mechanism further includes an annular pad located between the locking ball and the nut, and the annular pad is movably disposed along the axial direction of the drill body. Further, the drill body has a second thrust surface between the first thrust surface and the nut and facing the nut, and the annular pad abuts the second thrust surface. Further, the inner peripheral wall of the annular pad has a limiting surface that prevents the annular pad from rotating around the drill body. Further, the locking mechanism further includes a bearing between the annular pad and the nut. Further, the nut has a support groove, and the bearing is located in the support groove.
  • FIG. 1 shows a schematic view of a drill chuck according to an embodiment of the present invention
  • FIG. 2 shows a schematic view of a jaw according to an embodiment of the present invention
  • FIG. 4 is a schematic view showing an angle of a silk sleeve according to an embodiment of the present invention
  • FIG. 5 is a view showing another embodiment of a silk sleeve according to an embodiment of the present invention.
  • FIG. 6 is a schematic view showing an angle of a jacket according to an embodiment of the present invention;
  • FIG. 7 is a schematic view showing another angle of the outer casing according to an embodiment of the present invention;
  • FIG. 9 shows a schematic view of an elastic pad in accordance with an embodiment of the present invention; and
  • FIG. 10 illustrates an annular pad in accordance with an embodiment of the present invention.
  • a drill chuck including a drill body 1, a jaw 9, a casing 2, a nut 8, a nut sleeve 6, and a locking mechanism.
  • the drill body 1 is provided with a plurality of oblique guiding holes distributed along the circumferential direction, and the front end of the inclined guiding holes is open. Referring to Fig.
  • a plurality of jaws 9 are provided in one-to-one correspondence with the plurality of oblique guide holes, and are slidable in the oblique direction of the oblique guide holes.
  • Each jaw 9 has an externally threaded section 91.
  • the jaw 9 has a gripping position that extends the front end of the oblique guide hole, and a retracted position in which the oblique guide hole is retracted.
  • the front ends of the plurality of jaws 9 are close to each other to hold the tool.
  • the front ends of the plurality of jaws 9 are away from each other to remove the tool. Referring to FIG.
  • the nut 8 is sleeved outside the plurality of jaws 9 and meshes with the externally threaded segment 91 to drive the jaw 9 to extend or retract the oblique guide hole.
  • the silk sleeve 6 is sleeved on the silk core 8 and is connected to the silk core 8 so as not to be relatively rotatable.
  • the front end of the threaded sleeve 6 has a plurality of driven members 61 extending radially inwardly, and the rear end of the threaded sleeve 6 has a plurality of elastic pawls 62 which are radially contractible.
  • the outer casing 2 is sleeved on the drill body 1 and is rotatable about the central axis of the drill body 1.
  • the outer sleeve 2 is drivingly connected to the silk sleeve 6.
  • the front end of the outer casing 2 has a plurality of driving grooves 21, and the plurality of driving grooves 21 cooperate with the plurality of driven members 61 to form a spline structure.
  • the driven member 61 is movable in the drive groove 21 and has a first position and a second position in the drive groove 21.
  • the rear end of the outer sleeve 2 has a first recess 22 and a second recess 23, and the depth of the first recess 22 is greater than the depth of the second recess 23, and the elastic pawl 62 is selectively located in the first recess 22 or Two grooves 23 in the middle.
  • the elastic pawl 62 is located in the first recess 22 when the driven member 61 is in the first position.
  • the elastic pawl 62 is located in the second recess 23, and the elastic pawl 62 is gathered radially inward.
  • an anti-slip portion 24 is provided on the outer peripheral wall of the outer casing 2, and the anti-slip portion 24 extends in the axial direction of the drill body 1.
  • a positioning clip spring 25 is disposed inside the outer casing 2, and the positioning clip spring 25 abuts against the nut sleeve 6.
  • the locking mechanism is located between the first thrust surface of the drill body 1 and the nut 8 for preventing the jaws 9 from coming loose during the clamping position, making the jaws 9 more secure and reliable.
  • the locking mechanism comprises a locking disc 3 and a locking ball 4 which are arranged one after the other along the first thrust surface to the nut 8.
  • the locking ball 4 is preferably a steel ball.
  • the outer periphery of the lock disk 3 has a plurality of ratchet teeth 32.
  • the elastic pawl 62 contracts radially inwardly to abut against the tooth grooves of the ratchet teeth 32.
  • a plurality of sliding grooves 31 are provided on the end face of the locking disk 3 toward the core 8 , and the locking balls 4 are movably disposed in the sliding grooves 31.
  • the chute 31 has a helix angle, which is larger than the helix angle of the internal thread of the nut 8, so that the locking disc 3 can push the locking ball 4 to move to the deeper end of the chute 31, and extrude the nut 8
  • the jaws 9 prevent the jaws 9 from coming loose.
  • the helix angle is smaller than the friction angle between the two materials of the locking ball 4 and the locking disk 3, so that the locking ball 4 can realize the self-locking function.
  • the locking mechanism further includes an elastic pad 10 between the first thrust surface of the drill body 1 and the locking disk 3. The elastic pad 10 is used to press the locking disk 3,.
  • the locking mechanism further comprises an annular pad 5, the annular pad 5 is located between the locking ball 4 and the nut 8, the annular pad 5 cannot rotate around the drill body 1, but can be along the axial direction of the drill body 1. motion.
  • a second thrust surface facing the nut 8 is provided between the first thrust surface of the drill body 1 and the nut 8, and the annular pad 5 abuts against the second thrust.
  • the inner peripheral wall of the annular pad 5 has a plurality of limiting faces 51.
  • the locking mechanism further comprises a bearing 7, which is situated between the annular pad 5 and the nut 8.
  • the rear end face of the nut 8 has a support groove having an L-shaped cross section, and the bearing 7 is located in the support groove to enable radial positioning.
  • the outer casing 2 drives the wire sleeve 6 to rotate in the forward direction, so that the elastic pawl 62 is located in the second groove 23, and the elastic pawl 62 is pressed inwardly to contract, and the ratchet disk 3 is ratcheted.
  • the tooth grooves of 32 abut, so that the wire nut 6 drives the locking disk 3 to rotate in the same direction, and pushes the locking ball 4 to move to the deeper side of the chute 31 until the jaws 9 extend and are in the clamping position.
  • the threaded sleeve 6 rotates in the opposite direction, and drives the locking disk 3 to rotate in the same direction, so that the locking ball 4 moves to the shallower side of the sliding groove 31, and further A pressing force is generated on the annular pad 5, and since the elastic pad 10 always presses the locking disk 3, the locking ball 4 is always pressed against the annular pad 5.
  • the pressing force is transmitted to the jaws 9 through the bearing 7, the nut 8 and the jaws 9 are closed tightly by the oblique guiding holes to prevent loosening.
  • the jaws 9 are locked, the locking disk 3 cannot continue to rotate.
  • the above-mentioned embodiments of the present invention achieve the following technical effects:
  • the locking mechanism By providing a simple locking mechanism, when the jaw is in the clamping position and there is a sign of looseness, the locking mechanism
  • the locking disc and the locking ball can press the jaws to prevent the jaws from loosening and increase the clamping strength of the jaws.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

一种钻夹头,包括:钻体(1),具有多个沿周向均匀分布的斜导向孔;多个夹爪(9),一一对应地在斜导向孔中可滑动地设置,夹爪具有外螺纹段(91);外套(2),可转动地套设在钻体上;丝母(8),与夹爪相啮合,外套与丝母驱动连接;钻夹头还包括锁紧机构,位于钻体的第一止推面与丝母之间,锁紧机构包括锁紧盘(3)和锁紧球(4),锁紧盘朝向丝母的端面上设置有多个具有螺旋升角的滑槽(31),滑槽的螺旋升角小于锁紧球与锁紧盘之间的摩擦角,锁紧球沿滑槽可运动地设置。该钻夹头以简单的结构防止工作状态下的松脱。

Description

钻夹头 技术领域 本实用新型涉及加工机械领域, 具体而言, 涉及一种钻夹头。 背景技术 现有的钻夹头具有使夹爪伸出以夹持工具, 和使夹爪缩回以松开工具的功能, 为 了防止夹爪在夹持位置时松脱, 许多钻夹头还设置了锁紧结构, 以防止夹爪在工作状 态下松脱。 然而, 现有的钻夹头的锁紧结构比较复杂。 实用新型内容 本实用新型旨在提供一种结构简单的能防止工作状态下松脱的钻夹头。 为了实现上述目的, 根据本实用新型的一个方面, 提供了一种钻夹头, 包括: 钻 体, 具有多个沿周向均勾分布的斜导向孔; 多个夹爪, 一一对应地在斜导向孔中可滑 动地设置, 夹爪具有外螺纹段; 外套, 可转动地套设在钻体上; 丝母, 与夹爪相啮合, 外套与丝母驱动连接; 钻夹头还包括: 锁紧机构, 位于钻体的第一止推面与丝母之间, 锁紧机构包括锁紧盘和锁紧球, 锁紧盘朝向丝母的端面上设置有多个具有螺旋升角的 滑槽, 滑槽的螺旋升角小于锁紧球与锁紧盘之间的摩擦角, 锁紧球沿滑槽可运动地设 置。 进一步地, 钻夹头还包括丝母套, 丝母套与丝母固定连接, 外套与丝母套驱动连 接。 进一步地, 丝母套的前端具有沿径向向内延伸的被驱动件, 丝母套的后端具有弹 性棘爪; 外套的前端具有与被驱动件相配合的驱动槽, 被驱动件具有在驱动槽中的第 一位置和第二位置, 外套的后端具有与弹性棘爪相配合的第一凹槽和第二凹槽, 且第 一凹槽的深度大于第二凹槽的深度, 当被驱动件位于第一位置时, 弹性棘爪位于第一 凹槽中, 当被驱动件位于第二位置时, 弹性棘爪位于第二凹槽中; 锁紧盘具有棘齿, 当弹性棘爪位于第二凹槽中时, 弹性棘爪与棘齿的齿槽抵接。 进一步地,锁紧机构还包括弹性垫, 弹性垫位于钻体的第一止推面与锁紧盘之间。 进一步地, 锁紧机构还包括环形垫, 环形垫位于锁紧球与丝母之间, 环形垫沿钻 体的轴向方向可运动地设置。 进一步地, 钻体具有位于第一止推面与丝母之间且朝向丝母的第二止推面, 环形 垫与第二止推面抵接。 进一步地, 环形垫的内周壁具有防止环形垫绕钻体转动的限位面。 进一步地, 锁紧机构还包括轴承, 轴承位于环形垫与丝母之间。 进一步地, 丝母具有支撑槽, 轴承位于支撑槽中。 应用本实用新型的技术方案, 通过设置结构简单的锁紧机构, 当夹爪位于夹持位 置并有松动迹象时, 该锁紧机构中的锁紧盘和锁紧球能够将夹爪压紧, 以防止夹爪松 脱, 增加夹爪的夹持牢固程度。 附图说明 构成本申请的一部分的说明书附图用来提供对本实用新型的进一步理解, 本实用 新型的示意性实施例及其说明用于解释本实用新型, 并不构成对本实用新型的不当限 定。 在附图中: 图 1示出了根据本实用新型的实施例的钻夹头的示意图; 图 2示出了根据本实用新型的实施例的夹爪的示意图; 图 3示出了根据本实用新型的实施例的丝母的示意图; 图 4示出了根据本实用新型的实施例的丝母套的一个角度的示意图; 图 5示出了根据本实用新型的实施例的丝母套的另一个角度的示意图; 图 6示出了根据本实用新型的实施例的外套的一个角度的示意图; 图 7示出了根据本实用新型的实施例的外套的另一个角度的示意图; 图 8示出了根据本实用新型的实施例的锁紧盘的示意图; 图 9示出了根据本实用新型的实施例的弹性垫的示意图; 以及 图 10示出了根据本实用新型的实施例的环形垫的示意图。 具体实施方式 下面将参考附图并结合实施例来详细说明本实用新型。 需要说明的是, 在不冲突 的情况下, 本申请中的实施例及实施例中的特征可以相互组合。 如图 1所示,根据本实用新型的实施例,提供了一种钻夹头,包括钻体 1、夹爪 9、 外套 2、丝母 8、 丝母套 6以及锁紧机构。其中钻体 1内设置有多个沿周向均勾分布的 斜导向孔, 斜导向孔的前端开放。 结合参见图 2, 多个夹爪 9与多个斜导向孔一一对应地设置, 且可以沿斜导向孔 的倾斜方向滑动。 每个夹爪 9均具有外螺纹段 91。 夹爪 9具有伸出斜导向孔的前端的 夹持位置, 以及缩回斜导向孔的松开位置。 当处于夹持位置时, 多个夹爪 9的前端部 相互靠近, 以夹持工具。 当处于松开位置时, 多个夹爪 9的前端部相互远离, 以便将 工具卸下。 结合参见图 3, 丝母 8套设在多个夹爪 9外, 且与外螺纹段 91相啮合, 可以带动 夹爪 9伸出或缩回斜导向孔。 结合参见图 4和图 5, 丝母套 6套设在丝母 8夕卜, 与丝母 8过盈连接, 不可相对 转动。 丝母套 6的前端具有多个沿径向向内延伸的被驱动件 61, 丝母套 6的后端具有 多个可以沿径向收缩的弹性棘爪 62。 结合参见图 6和图 7, 外套 2套设在钻体 1夕卜, 且可以绕钻体 1的中心轴线转动。 外套 2与丝母套 6驱动连接。 外套 2的前端具有多个驱动槽 21, 多个驱动槽 21与多 个被驱动件 61—一对应配合形成花键结构。被驱动件 61可以在驱动槽 21中运动, 且 具有在驱动槽 21中的第一位置和第二位置。 外套 2的后端具有第一凹槽 22和第二凹 槽 23, 且第一凹槽 22的深度大于第二凹槽 23的深度, 弹性棘爪 62选择性地位于第 一凹槽 22或第二凹槽 23中。 当被驱动件 61位于第一位置时, 弹性棘爪 62位于第一 凹槽 22中。 当被驱动件 61位于第二位置时, 弹性棘爪 62位于第二凹槽 23中, 且弹 性棘爪 62沿径向向内收拢。 为了方便对外套 2的转动, 在外套 2的外周壁上还设置有防滑部 24, 防滑部 24 沿钻体 1的轴向方向延伸。 为了方便丝母套 6的定位, 在外套 2内部设置有定位卡簧 25, 定位卡簧 25与丝 母套 6抵接。 结合参见图 8,锁紧机构位于钻体 1的第一止推面与丝母 8之间,用于防止夹爪 9 在夹持位置时松脱, 使夹爪 9闭合更加牢固与可靠。 锁紧机构包括沿第一止推面到丝 母 8依次设置的锁紧盘 3和锁紧球 4, 锁紧球 4优选为钢球。 锁紧盘 3的外周具有多 个棘齿 32, 当弹性棘爪 62位于第二凹槽 23中时, 弹性棘爪 62沿径向向内收缩, 从 而与棘齿 32的齿槽抵接。锁紧盘 3朝向丝母 8的端面上设置有多个滑槽 31,锁紧球 4 可运动地设置在滑槽 31中。 滑槽 31带有螺旋升角, 该螺旋升角大于丝母 8内螺纹的 螺旋升角, 使锁紧盘 3可以推动锁紧球 4向滑槽 31的较深端运动, 挤压丝母 8、 夹爪 9, 防止夹爪 9松脱。 同时该螺旋升角还小于锁紧球 4与锁紧盘 3两种材料之间的摩擦 角, 使锁紧球 4能够实现自锁功能。 结合参见图 9,锁紧机构还包括弹性垫 10, 弹性垫 10位于钻体 1的第一止推面与 锁紧盘 3之间。 弹性垫 10用于挤压锁紧盘 3,。 结合参见图 10,锁紧机构还包括环形垫 5,环形垫 ,5位于锁紧球 4与丝母 8之间, 环形垫 5不能绕钻体 1转动, 但可以沿钻体 1的轴向方向运动。 为了使环形垫 ,5更好 地定位, 在钻体 1的第一止推面与丝母 8之间设置有朝向丝母 8的第二止推面, 环形 垫 5抵接在第二止推面上。 为了防止环形垫 5转动, 环形垫 5的内周壁具有多个限位 面 51, 多个限位面 51与多个斜导向孔一一对应地配合, 使环形垫 5不能发生周向运 动。 为了减少阻力, 增加力矩输入, 锁紧机构还包括轴承 7, 轴承 7位于环形垫 5与 丝母 8之间。 丝母 8的后端面具有横截面为 L形的支撑槽, 轴承 7位于支撑槽中, 可 以实现径向定位。 当钻夹头在拧紧时,外套 2驱动丝母套 6正向转动,使弹性棘爪 62位于第二凹槽 23中, 压迫弹性棘爪 62向内收缩, 并与锁紧盘 3上棘齿 32的齿槽抵接, 从而使丝母 套 6带动锁紧盘 3同向转动, 推动锁紧球 4向滑槽 31较深的一侧运动, 直至夹爪 9 伸出并位于夹持位置。 如果夹爪 9在夹持位置时出现松脱趋势, 丝母套 6向反向转动, 并带动锁紧盘 3 同向转动, 使锁紧球 4向滑槽 31较浅的一侧运动, 进而对环形垫 5产生挤压力, 由于 弹性垫 10始终挤压着锁紧盘 3, 使锁紧球 4始终挤压在环形垫 5上。 该挤压力通过轴 承 7、丝母 8传递至夹爪 9,通过斜导向孔,使夹爪 9闭合更紧,起到防止松脱的目的。 当夹爪 9锁紧后, 锁紧盘 3无法继续转动。 从以上的描述中, 可以看出, 本实用新型上述的实施例实现了如下技术效果: 通 过设置结构简单的锁紧机构, 当夹爪位于夹持位置并有松动迹象时, 该锁紧机构中的 锁紧盘和锁紧球能够将夹爪压紧, 以防止夹爪松脱, 增加夹爪的夹持牢固程度。 以上所述仅为本实用新型的优选实施例而已, 并不用于限制本实用新型, 对于本 领域的技术人员来说, 本实用新型可以有各种更改和变化。 凡在本实用新型的精神和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本实用新型的保护范围 之内。

Claims

权 利 要 求 书
1. 一种钻夹头, 包括:
钻体 (1), 具有多个沿周向均勾分布的斜导向孔;
多个夹爪(9),一一对应地在所述斜导向孔中可滑动地设置,所述夹爪(9) 具有外螺纹段 (91);
外套 (2), 可转动地套设在所述钻体 (1) 上;
丝母(8), 与所述夹爪 (9)相啮合, 所述外套 (2) 与所述丝母(8)驱动 连接;
其特征在于, 所述钻夹头还包括:
锁紧机构, 位于所述钻体 (1) 的第一止推面与所述丝母 (8) 之间, 所述 锁紧机构包括锁紧盘 (3) 和锁紧球 (4), 所述锁紧盘 (3) 朝向所述丝母 (8) 的端面上设置有多个具有螺旋升角的滑槽(31), 所述滑槽(31)的螺旋升角小 于所述锁紧球(4)与所述锁紧盘(3)之间的摩擦角, 所述锁紧球(4)沿所述 滑槽 (31) 可运动地设置。
2. 根据权利要求 1所述的钻夹头, 其特征在于, 所述钻夹头还包括丝母套 (6), 所述丝母套 (6)与所述丝母(8) 固定连接, 所述外套 (2)与所述丝母套 (6) 驱动连接。
3. 根据权利要求 2所述的钻夹头, 其特征在于,
所述丝母套 (6) 的前端具有沿径向向内延伸的被驱动件 (61), 所述丝母 套 (6) 的后端具有弹性棘爪 (62);
所述外套 (2) 的前端具有与所述被驱动件 (61) 相配合的驱动槽 (21), 所述被驱动件 (61) 具有在所述驱动槽 (21) 中的第一位置和第二位置, 所述 外套(2) 的后端具有与所述弹性棘爪(62)相配合的第一凹槽(22)和第二凹 槽(23), 且所述第一凹槽(22) 的深度大于所述第二凹槽(23) 的深度, 当所 述被驱动件 (61) 位于所述第一位置时, 所述弹性棘爪 (62) 位于所述第一凹 槽(22) 中, 当所述被驱动件(61)位于所述第二位置时, 所述弹性棘爪(62) 位于所述第二凹槽 (23) 中; 所述锁紧盘 (3) 具有棘齿 (32), 当所述弹性棘爪 (62) 位于所述第二凹 槽 (23) 中时, 所述弹性棘爪 (62) 与所述棘齿 (32) 的齿槽抵接。
4. 根据权利要求 1至 3中任一项所述的钻夹头, 其特征在于, 所述锁紧机构还包 括弹性垫 (10), 所述弹性垫 (10) 位于所述钻体 (1) 的所述第一止推面与所 述锁紧盘 (3) 之间。
5. 根据权利要求 1至 3中任一项所述的钻夹头, 其特征在于, 所述锁紧机构还包 括环形垫 (5), 所述环形垫 (5) 位于所述锁紧球 (4) 与所述丝母 (8) 之间, 所述环形垫 (5) 沿所述钻体 (1) 的轴向方向可运动地设置。
6. 根据权利要求 5所述的钻夹头, 其特征在于, 所述钻体(1)具有位于所述第一 止推面与所述丝母 (8) 之间且朝向所述丝母 (8) 的第二止推面, 所述环形垫
(5) 与所述第二止推面抵接。
7. 根据权利要求 6所述的钻夹头, 其特征在于, 所述环形垫(5) 的内周壁具有防 止所述环形垫 (5) 绕所述钻体 (1) 转动的限位面 (51)。
8. 根据权利要求 5所述的钻夹头, 其特征在于, 所述锁紧机构还包括轴承 (7), 所述轴承 (7) 位于所述环形垫 (5) 与所述丝母 (8) 之间。
9. 根据权利要求 8所述的钻夹头, 其特征在于, 所述丝母(8)具有支撑槽, 所述 轴承 (7) 位于所述支撑槽中。
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EP2837449A4 (en) 2016-01-13
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EP2837449A1 (en) 2015-02-18
US9744601B2 (en) 2017-08-29
US20150165529A1 (en) 2015-06-18

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