WO2005090004A1 - インパクトレンチ - Google Patents
インパクトレンチ Download PDFInfo
- Publication number
- WO2005090004A1 WO2005090004A1 PCT/JP2005/000299 JP2005000299W WO2005090004A1 WO 2005090004 A1 WO2005090004 A1 WO 2005090004A1 JP 2005000299 W JP2005000299 W JP 2005000299W WO 2005090004 A1 WO2005090004 A1 WO 2005090004A1
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- WIPO (PCT)
- Prior art keywords
- hammer
- rotation direction
- hitting
- cam groove
- driver
- Prior art date
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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
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
- B25B21/026—Impact clutches
Definitions
- the present invention relates to an impact wrench used for performing a tightening operation and a loosening operation of screws such as bolts and nuts.
- a conventional impact wrench 100 includes a substantially disk-shaped cam groove forming portion 112 in which a cam groove 111 is recessed in a part of a peripheral surface thereof, and a cam groove forming portion 112.
- a driver 110 having a bearing portion (not shown) protruding from one surface and rotating around the center of the bearing portion; and two facing hammer bearings each provided with a bearing portion on the same axis.
- the cam groove forming portion 112 is disposed between the two hammer receiving portions 121 (only one side is shown in FIG. 10), and the bearing portion of the driver 110 is mounted on one of the hammer receiving portions 121.
- a rotary hammer support 120 provided with a bearing hole (not shown) rotatably mounted thereon, a shaft 131 having two ends supported by shaft supports of two hammer receivers 121, and a shaft 131.
- the two striking parts 13 2, 133 which project in a symmetrical shape about the center axis of Also, it is loosely fitted in the cam groove 111, receives a force in the set rotation direction by the cam groove wall surface of the driver, and swings the hitting portion 132 (133) in the forward rotation direction in the direction of rising around the shaft portion 131.
- a hammer 130 having a cam groove loose fitting portion 134 to be formed.
- the driver 110 rotates with the rotation of the motor (not shown), and the hammer 130 and the rotary hammer support 120 rotate with the rotation of the driver 110.
- the corresponding receiving portions 141 (142) provided so that the hitting portions 132 (133) protrude from the peripheral surface of the anvil 140 rotate the anvil 140 in the hitting direction, and the rotation of the anvil 140 causes the anvil 140 to rotate.
- screws such as bolts and nuts can be tightened or loosened (for example, see Patent Document 1).
- the cam groove loose fitting portion 134 of the hammer 130 is loosely fitted into the cam groove 111 of the cam groove forming portion 112, the driver to which the rotational force in the forward rotation direction is applied during the rebound described above. Due to the inner wall surface of the cam groove 111 of the cam 110, the cam groove loose fitting portion 134 is pushed in a forward rotation direction at a position closer to the anvil 140 than the center of the shaft 131 of the hammer 130. Therefore, the hitting portions 132 and 133 swing about the shaft portion 131, and the hitting portion 132 (133) in the forward rotation direction is moved away from the anvil, that is, raised.
- the hitting portion 141 (142) hits the receiving portion 141 (142) in a state where the hitting portion 132 (133) in the normal rotation direction is sufficiently accelerated before rising by the action of the driver 110, and the ambil 140 is rotated again in the hitting direction. It's like that.
- the impact posture of the hammer 130 is determined by factors such as the tightness of the hit object such as a nut, the rotational force of the motor, and the ratio of the inertial mass of the motor to the total inertial mass of the rotating nominal support and the nominal. The condition and rising condition vary. Then, depending on how the hammer 130 strikes and changes its striking posture, there may be a problem called “reverse strike”, “slip strike”, “double strike” or the like described below.
- the "back strike” means that the hammer 130 strikes the receiving part 141 after the hitting part 132 of the hammer 130 hits, and then the hammer 130 moves forward as shown in FIG. 11 (b).
- Force that rebounds in the opposite direction to the rotation direction As shown in Fig. 11 (c), the receiver 142 in the reverse rotation direction of the anvil 140 is installed at a close position so that it can be easily reached by the rebound of the hammer 130. This means that the hammer hitting portion 133 in the reverse rotation direction hits the receiving portion 142 of the anvil 140 in the reverse rotation direction.
- slip hit The phenomenon in which the user rises in the direction away from the ground and the hitting portion 132 (133) of the hammer 130 hits the corner of the receiving portion 141 (142) of the anvil 140 is referred to as "slip hit”. If this “slipper” occurs, it will not be possible to transmit sufficient striking force to the anvil 140, and the striking part 132 (133) of the hammer 130 and the receiving part 141 of the anvil 140 will wear out early. Problems arise. Also, this "slipper” When this occurs, as shown in FIG. 12 (b), the hammer 130 hardly rebounds and rotates in the forward rotation direction. Note that “slip strike” may occur both when hitting immediately after rebounding and moving in the forward rotation direction, and when hitting after making one lap.
- Double strike '' means that after a relatively large rebound occurs, it moves in the forward rotation direction, and after the striking section 132 (133) assumes the striking posture and reaches the receiving section 141 (142). A phenomenon in which the player does not get up enough and cannot hit the receiving part 141 (142) hit immediately before without sufficiently rotating speed, and hits again. That is, if "double hit" occurs, sufficient striking power cannot be obtained.
- a projecting portion 2 for forming a receiving portion provided with receiving portions 221 and 222 is provided.
- An impact wrench 200 in which an anvil 210 and a striking posture forming protrusion 230 are separately provided has already been proposed (for example, see Patent Document 2).
- the receiving portion 221 (222) in the reverse rotation direction is formed at a position sufficiently distant in the rebound direction of the hammer 240, so that the hammer 240 rebounds in a normal use state described later.
- the reverse rotation direction impact portion 241 (242) of the hammer 240 does not hit the reverse rotation direction receiving portion 221 (222). Therefore, there is no problem of "backlash", but when rebounding, the impact portion 241 (242) in the reverse rotation direction rebounds while rubbing the impact posture forming projection 230, so that the rebound distance is shortened. . Therefore, the hammer does not have a sufficient approach distance, and as a result, the hammer's impact strength is weak. Also, the problem of "slip hit” or "double hit” cannot be solved.
- Patent Document 1 Japanese Utility Model Publication No. 57-1092
- Patent Document 2 Japanese Utility Model Application Laid-Open No. 61-117673
- the present invention has been made in view of the above circumstances, and has as its object to provide an impact wrench that does not cause a problem called “reverse hit”, “slip hit”, “double hit”, or the like.
- an impact wrench that is useful in the present invention includes a substantially disk-shaped cam groove forming portion in which a cam groove is recessed in a part of its peripheral surface, and a cam groove forming portion.
- One side A driver that has a bearing portion protruding therefrom and rotates around the center of the bearing portion, and two facing hammer receiving portions each provided with a bearing portion on the same axis, and two hammer receiving portions.
- a rotating groove and a hammer support having a bearing groove in which a cam groove forming portion is disposed and a bearing portion of the driver is rotatably mounted on one of the hammer receiving portions;
- a shaft portion whose both ends are supported by the shaft support portions of the two hammer receiving portions, two striking portions projecting symmetrically about the center axis of the shaft portion, and the cam groove,
- a hammer having a cam groove play fitting portion for receiving a force in a set rotation direction by a cam groove wall surface of the driver and swinging a striking portion in a forward rotation direction in a direction of rising around the shaft portion;
- the driver rotates with the rotation of the motor, and the hammer and the rotation-nommer support rotate with the rotation of the driver, and the rotation of the hammer causes the impact portion in the forward rotation direction to protrude to the peripheral surface of the anvil.
- the frictional resistance force between the bearing portion and the rotating normmer support is rotated by the rotation of the driver with the rotation of the driver, When the repulsive force due to the impact is applied, the friction resistance value is adjusted so that the rotation is released.
- the receiving portion corresponding to the hammer hitting portion in the reverse rotation direction is formed on the anvil so as to be located on the reverse rotation direction side from the maximum rebound position reached by the hitting portion in the reverse rotation direction after hitting in a normal use state.
- the receiving portion corresponding to the hammer hitting portion in the reverse rotation direction is formed on the anvil so as to be located on the reverse rotation direction side from the maximum rebound position reached by the hitting portion in the reverse rotation direction after hitting in a normal use state.
- a shaft portion for example, a shaft portion, two hitting portions, and a cam groove loose fitting portion formed on a body (hereinafter, referred to as “shaft integrated hammer”)
- shaft integrated hammer a shaft portion Becomes A shaft pin and a hammer body integrally formed with two hitting portions and a cam groove play fitting portion
- the hitting portion of the hammer body is swingable about the shaft pin by passing the shaft pin through the shaft pin through hole provided in the hammer body of the main body (hereinafter, referred to as “shaft portion”). Separate hammer ").
- the method of adjusting the frictional resistance value in the rotational direction between the bearing portion and the rotating-nommer support is not particularly limited.
- the peripheral surface of the bearing portion and the rotation of the rotating surface and the A method of interposing a frictional resistance adjusting material between the body and the contact surface of the body may be used.
- the frictional resistance adjusting material includes an O-ring, a general rubber member, a metal fiber as a friction fiber base material, a heat-resistant organic fiber, and an inorganic fiber such as carbon fiber or glass fiber as a binder such as rubber or resin. Molded products obtained by mixing, sintered metal-based friction materials and the like can be mentioned.
- the means for holding the posture of the hammer is not particularly limited.
- the hammer in the case of a hammer integrated with a shaft, for example, the hammer is provided between the shaft and the shaft supporting portion of the rotary-nommer support that supports the shaft.
- the frictional resistance adjusting material as described above is interposed between the shaft pin and the shaft pin through hole and the shaft support hole of the hammer receiving portion.
- a method of interposing a frictional resistance adjusting material between the hammer receiving portion and the surface of the hammer that opposes the hammer receiving portion When the hammer or hammer body is in the striking position, the hammer or hammer body is locked to maintain the striking posture, and when the hammer climbs over the protruding portion of the anvil, the striking portion in the reverse rotation direction is pushed up by the protruding portion. Include those locking is used a method in which providing the locking member is released when the rebound Te cowpea to blow.
- the normal use state refers to a use state within a practical torque range of the impact wrench. For example, when the bolt or nut is used to tighten or loosen a bolt or a nut that is larger than the use standard of the impact wrench, it is not used. It is in a steady use state.
- the set rotation direction refers to the rotation direction set in the impact wrench, and may be a screw tightening direction or a loosening direction. The same set rotation direction is maintained until switching by the rotation direction switching device.
- the forward rotation direction is the The rotation direction is the same as the rotation direction, and the reverse rotation direction is a rotation direction opposite to the set rotation direction.
- corotation means that the rotating normer support rotates at substantially the same speed in the rotational direction of the driver following the rotation of the driver.
- the release of the co-rotation means that the driver rotates in the opposite direction relative to the driver.
- the impact wrench according to the present invention is configured as described above, and thus does not cause a problem referred to as "reverse hit", "slip hit”, or “double hit”.
- the hammer hits the anvil, makes a smooth rebound without ⁇ backlash '', and then shifts to the normal rotation direction, and is equipped with the normal rotation direction receiving part of the anvil hit immediately before. After making a round over the protruding part, it accelerates and rotates toward the receiving part in the forward rotation direction to be hit.
- a sufficiently large unbounded rebound distance also contributes to the acceleration of the hammer as a strike approach distance, so that the anvil can be hit at a high speed. That is, a large impact force can be exhibited.
- screws such as bolts and nuts can be quickly and efficiently tightened and loosened.
- FIG. 1 is an exploded perspective view showing an impact wrench according to a first embodiment of the present invention.
- FIG. 2 is a longitudinal sectional view of a main part of the impact wrench of FIG. 1.
- FIG. 3 is a cross-sectional view of a main part of the impact wrench of FIG. 1.
- FIG. 4 is an explanatory view illustrating movement of a hammer of the impact wrench of FIG. 1.
- FIG. 5 is a partially cut-away sectional view showing an impact wrench according to a second embodiment of the present invention.
- FIG. 6 is a perspective view showing a rotating normer support used in the impact wrench of FIG. 5.
- FIG. 7 is a cross-sectional view of a principal part of an impact wrench according to a third embodiment of the present invention.
- FIG. 8 is a cross-sectional view illustrating a main part of an impact wrench according to a fourth embodiment of the present invention.
- FIG. 9 is a view as viewed in the direction of the arrow X in FIG. 8.
- FIG. 10 is a sectional view of a main part of a conventional impact wrench.
- FIG. 11 is an explanatory diagram for explaining a conventional reverse impact wrench.
- FIG. 12 is an explanatory diagram for explaining slip impact of a conventional impact wrench.
- FIG. 13 is a sectional view of a main part of a known impact wrench.
- FIG. 1 to FIG. 3 show a first embodiment of an impact wrench according to the present invention.
- the impact wrench A includes a casing 1, an air motor 2, a driver 3, a hammer 4a, a rotating hammer support 5a, and an anvil 6.
- the casing 1 includes a front cover 11 that can be divided and a rear cover 12.
- the rear cover 12 has a main body 21 of the air motor 2 built therein and an operation handle 13 provided on the body.
- the front cover portion 11 has a driver 3, a hammer 4a, a rotating-nommer support 5a, and an anvil 61 of the anvil 6 built therein.
- the tip of the rotating shaft 22 protrudes from the rear cover 12 to the front cover 11, and a spline ridge (key) 22 a is formed on the tip of the rotating shaft 22 in the circumferential direction. Have been.
- the driver 3 includes a substantially disk-shaped cam groove forming portion 31 in which a cam groove 31a is recessed in a part of the peripheral surface thereof, and a bearing in which one surface force of the cam groove forming portion 31 is also provided.
- a connecting hole 33 is formed so as to penetrate the cam groove forming portion 31 and the bearing portion 32.
- connection hole 33 has an inner surface formed with a spline groove 33a in which the spline ridge 22a of the rotating shaft 22 engages. Therefore, the engagement between them causes the air motor 2 and the driver 3 to rotate as a unit.
- the hammer 4a includes a shaft portion 41, two hitting portions 42, 43 curved in a cross-sectional arc shape projecting symmetrically around the center axis of the shaft portion 41, and a center axis of the shaft portion 41. It is provided so as to be orthogonal to the other and protrudes in the radial direction of the hitting portions 42 and 43, and is loosely fitted in the cam groove 31a A cam groove loose fitting portion 44 is provided.
- a ring-shaped groove 45 is formed at both ends of the shaft portion 41, and an O-ring 7a made of a rubber elastomer is mounted in the groove 45 as posture holding means.
- the O-ring 7a is fitted together with the shaft portion 41 into a shaft support hole 56a or a concave portion 56b as a shaft support portion described later, so that the O-ring 7a is inserted into the cam groove play fitting portion 44 of the hammer 4a by the wall surface of the cam groove 31a of the driver 3.
- the friction occurs such that the shaft 41 does not rotate! /
- the rotary normer support 5a includes a cylindrical main body 51 and a lid 52 that serves as one hammer receiving portion.
- the cylindrical body 51 has an opening 53 on one side, a bearing hole 54 into which the bearing 32 of the driver 3 is rotatably fitted, and a bottom 55 serving as the other hammer receiving part. It has a substantially cylindrical shape with a bottom.
- the bottom portion 55 is provided with a shaft support hole 56a as a shaft support portion on which one end of the shaft portion 41 is rotatably supported.
- Two ring-shaped grooves 54a are formed on the inner surface of the bearing hole 54, and O-rings 7b made of rubber elastomer, which are friction resistance adjusting materials, are mounted in the grooves 54a.
- the O-ring 7b is pressed against the outer peripheral surface of the bearing portion 32, and the frictional force causes the O-ring 7b to rotate when the driver 3 rotates.
- the rolling force is directly transmitted to the rotary normal support 5a to make the rotary normal support 5a co-rotate with the driver 3, and a repulsive force is applied to the rotary support 5a via the hammer 4a.
- the friction resistance value is adjusted so that the rotation of the rotary-nommer support 5a with respect to the driver 3 is released.
- the cylindrical main body 51 includes a lid receiving portion 5la formed by cutting out in a stepped manner on the inner edge on the opening 53 side.
- the lid 52 is fitted into the tubular main body 51 while being received by the lid receiving portion 51a, and is integrally formed with the tubular main body 51, and the anvil 6 is provided at the center thereof.
- a through hole 52a is provided, and the other end of the shaft portion 41 is provided with a concave portion 56b as a shaft support portion rotatably supported by the shaft portion 41.
- the anvil 6 has an anvil trunk 61 at one end and a socket fitting portion 62 at the other end.
- the anvil trunk 61 is provided with two protruding portions 64a and 64b so as to protrude outward in the radial direction of the substantially cylindrical trunk main body 61a.
- the trunk main body 61a is provided with concave portions 61b, 61b that are concave in the radial direction at portions adjacent to the protruding portions 64a, 64b on the wall surface.
- the protruding portion 64a includes a receiving portion 65, and the protruding portion 64b includes a receiving portion 66.
- the receiving portion 66 (65) is provided so as to be located on the reverse rotation direction side from the maximum rebound position where the hitting portion 43 (42) in the reverse rotation direction reaches after the impact in the normal use state.
- the driver 3, the hammer 4a, the rotary hammer support 5a, and the anvil 6 are assembled as follows. That is, first, the bearing portion 32 of the driver 3 is fitted into the bearing hole 54 from the inside of the tubular main body portion 51 so that the cam groove forming portion 31 is arranged inside the tubular main body portion 51. Next, with the hammer 4a facing the cam groove 31a of the driver 3 with the cam groove play fitting portion 44, one end of the shaft portion 41 is fitted into the shaft support hole 56a. Then, the lid 52 is fitted into the cylindrical main body 51 so that the other end of the shaft portion 41 fits into the concave portion 56b of the lid 52 and is received by the lid receiving portion 51a. After the lid 52 is fitted into the tubular main body 51, finally, the anvil body 61 of the anvil 6 is inserted through the through-hole 52a into the rotary support 5a.
- the impact wrench A is located at a position opposite to the maximum rebound position reached by the hitting portion 43 (42) in the reverse rotation direction after the hitting portion 66 (65) of the anvil 6 is hit by the hammer 4a in a state of steady use.
- the impact portion 42 (43) in the normal rotation direction receives the receiving portion 65 (66) as shown in Fig. 4 (a). 4), even if the hammer 4a rebounds in the reverse rotation direction, as shown in Fig. 4 (b), the hammer 4a hits the counter rotation direction 43 (42) in the reverse rotation direction. It does not fall under (65). That is, there is no "backlash".
- the hammer 4a which has reached the receiving portion 65, climbs over the projecting portions 64a and 64b and rotates in the forward rotation direction while accelerating. to continue.
- the protrusions 64a and 64b lift the hitting portion 43 (42) in the reverse rotation direction so as to move away from the center force of the anvil 6, and the shaft 41 A force exceeding the frictional resistance of the O-ring 7a is applied to the shaft, and the hammer 4a swings about the shaft 41. That is, it swings until the striking section 42 (43) assumes the striking posture. Then, as shown in FIG.
- the normmer 4a in which the striking portion 42 (43) in the forward rotation direction has the striking posture maintains the posture as it is due to the frictional resistance of the O-ring 7a. It rotates again to the receiving part 65 (66) and reliably hits the receiving part 65 (66). Therefore, "slip" does not occur.
- the O-ring 7b has the following operation. That is, the hitting portion 43 (42) in the reverse rotation direction is lifted by the protrusions 64a and 64b, and the hitting portion 42 (43) in the forward rotation direction assumes a hitting posture as shown in FIG. 4 (d). Occasionally, the cam groove loose fitting portion 44 of the hammer 4a applies a force that pushes the driver 3 back in the reverse rotation direction against the wall surface of the cam groove 31a. The force overcomes the frictional resistance of the O-ring 7b and the rotation is released, and the driver 3 rotates to the lagging phase angle a with respect to the rotating normer support 5a.
- the O-ring 7b adjusts the frictional resistance value such that the rotating normal support 5a rotates with the rotation of the driver 3 and the revolving force is released when a repulsive force due to an impact is applied. Therefore, as shown in FIG. 4 (b), after the impact, the hammer 4a rotates in the opposite direction due to the repulsive force, and at the same time the rotating hammer support 5a supports the shaft 41 of the hammer 4a. The repulsive force is transmitted from the hammer 4a to the rotary normer support 5a and rebounds.
- the rotary normal support 5a overcomes the frictional resistance of the O-ring 7b, and the rotation is released, and the rotary normal support 5a rotates in the opposite direction relative to the driver 3.
- the driver 3 is the rotating normal support
- the advancer 5a rotates to the phase angle 13 and the wall of the cam groove 31a pushes the cam groove loose fitting portion 44 of the hammer 4a, so that the normer 4a rises. That is, when the driver 3 advances with respect to the rotary cutter 1 support body 5a and reaches a phase angle of
- the O-ring 7a does not have to be attached to both ends of the shaft portion 41 as described above, but may be attached to only one end of the shaft portion, or may be attached to the inner wall surface of the shaft support hole.
- a ring mounting groove may be formed, and the O-ring may be mounted on the shaft support hole side by fitting the O-ring into the O-ring mounting groove.
- the O-ring 7b may be only one, and may be mounted on the bearing portion 32 side instead of being mounted along the inner surface of the bearing hole 54 as described above.
- FIG. 5 and FIG. 6 show a second embodiment of an impact wrench according to the present invention.
- the impact wrench B includes a casing 1, an air motor 2, a driver 3, a hammer 4b, a rotating hammer support 5b, and an anvil 6.
- the rotary hammer support 5b is integrally connected via two semi-cylindrical connecting portions 59 facing the two hammer receiving portions 57, 58.
- One of the hammer receiving portions 57 has a bearing hole 57a and a bearing hole 57b as a bearing portion
- the other hammer receiving portion 58 has a through hole 58a of the anvil 6 and a bearing hole 57b.
- a shaft support hole 58b as a shaft support on the same axis.
- the hammer 4b includes a hammer body 46 and a shaft pin 47 serving as a shaft.
- the hammer body 46 includes hitting portions 42, 43 and a cam groove loose fitting portion 44 similar to the hammer 4a of the impact wrench A, and has a shaft pin through hole 46a. It is set up.
- the shaft pin 47 is formed with one O-ring mounting groove 47b, 47b at a portion fitted into the shaft support holes 57b, 58b at both ends, and two shafts at the insertion portion of the shaft pin through hole 46a.
- O ring attached Grooves 47a, 47a are formed, and O-rings 7c, 7d as posture holding means are mounted respectively.
- the driver 3, the hammer 4b, and the rotary hammer support 5b are provided with a cam groove forming portion 31 between the two hammer receiving portions 57, 58, similarly to the impact wrench A.
- the cam groove loose fitting portion 44 of the hammer body 46 enters the cam groove 31a of the driver 3, and The shaft pin through hole 46a is held in a state of being aligned with the axis of the shaft support holes 57b, 58b.
- the shaft pin 47 is transferred from the shaft support hole 57b (58b) of one hammer receiving portion 57 (58) through the shaft pin through hole 46a to the shaft support hole 58b (57b) of the other hammer receiving portion 58 (57). ), And the O-rings 7c at both ends are pressed against the inner wall surfaces of the shaft support holes 57b and 58b.
- the O-ring 7d is assembled by pressing the O-ring 7d against the inner wall surface of the shaft pin through-hole 46a.
- the O-ring 7c is adjusted to a frictional resistance value that can prevent rotation of the shaft pin 47 about the axis by the frictional resistance.
- the impact wrench B Since the impact wrench B is configured as described above, the repulsive force of the impact when rebounding and the force by which the wall surface of the cam groove 31a of the driver 3 pushes the cam groove play fitting portion 44 in the forward rotation direction. Due to the combined force of the above, the hitting portion 42 (43) in the forward rotation direction of the hammer main body 46 rises, and becomes a non-hitting posture. Then, even if the rebound ends and the normmer 4b starts to rotate in the normal rotation direction again, the frictional resistance of the O-rings 7c and 7d causes the hammer body 46 to rotate in the normal rotation direction. The hitting portion 42 (43) keeps the non-hitting position and rotates to the receiving portion 65 (66). Therefore, the striking portion 42 (43) does not "hit twice" or "slip hits” the receiving portion 65 (66).
- the hammer 4b climbs over the protrusions 64a, 64b while further accelerating. Similar to the impact wrench A, when the hammer 4b climbs over the protrusions 64a, 64b, the hammer 4b rotates in the reverse direction. Of the anvil 6 is lifted by the protrusions 64a, 64b so that the center of the anvil 6 moves away from the center of the anvil 6, and the hammer body 46 swings to hit the hitting portion 42 (43) in the forward rotation direction. Posture.
- the rotational force from the air motor 2 is transmitted to the hammer 4b, in which the striking portion 42 (43) in the forward rotation direction assumes the striking posture, as described below, and Rotate with 5 b. That is, since the driver 3 rotates integrally with the air motor 2, the wall surface of the cam groove 31a pushes the cam groove play fitting portion 44 of the hammer body 46 of the hammer 4b in the forward rotation direction. The hammer body 46 pushes the shaft support holes 57b and 58b of the rotary hammer support 5b via the shaft pin 47. Therefore, the hammer 4b and the rotary hammer support 5b rotate integrally. At this time, due to the frictional resistance of the O-rings 7c and 7d, the hammer 4b rotates while continuing to further accelerate while maintaining the striking posture of the striking portion 42 (43) in the forward rotation direction, and the receiving portion 65 ( Hit 66).
- the receiving portion 66 (65) of the anvil 6 moves from the maximum rebound position reached by the hitting portion 43 (42) in the reverse rotation direction after hitting by the hammer 4b in the normal use state.
- the hammer 4b in the reverse rotation direction strikes 43 (42) in the reverse rotation direction.
- the impact wrench B can quickly and efficiently tighten or loosen screws such as bolts and nuts.
- the O-rings 7c and 7d may be provided one by one. Further, it may be mounted not on the shaft pin 47 side but on the shaft pin through hole 46a and the shaft support holes 57b, 58b side.
- FIG. 7 shows an impact wrench according to a third embodiment of the present invention.
- the impact wrench C is provided with an O-ring mounting groove on both end surfaces of the hammer body 46 'of the hammer 4c in the axial direction of the force shaft pin hole 46a so as to surround the shaft pin hole 46a. 46c is formed, the O-ring mounting groove 46c is provided with an O-ring 7e as a posture holding means, and the shaft pin 47 'serving as a shaft portion is not V-mounted without the O-rings 7c and 7d. In the same manner as the impact wrench B described above.
- the impact wrench C is configured such that the O-ring 7e is pressed against the wall surfaces around the shaft support holes 57b and 58b of the hammer receiving portions 57 and 58, and the frictional resistance of the O-ring 7e rebounds the impact when rebounding
- the combined force of the force and the force of the wall of the cam groove 31a of the driver 3 pressing the cam groove play fitting portion 44 in the forward rotation direction is applied to the hammer 4c, and when the hammer 4c gets over the protrusions 64a and 64b.
- the hammer body 46 ' is connected to the shaft pin 47 except when a force is applied such that the hitting part 43 (42) in the reverse rotation direction is lifted so as to move away from the center force of the anvil 6 by the protrusions 64a and 64b. 'Don't rock around!
- the impact portion 42 (43) in the normal rotation direction assumes the non-impact position after the rebound
- the impact portion 42 (43) assumes the non-impact position due to the frictional resistance of the O-ring 7e.
- the striking part 42 (43) in the normal rotation direction assumes a striking posture, and the striking posture is maintained by the frictional resistance of the O-ring 7e! / RU
- the impact wrench C is configured as described above, has the same operation and effect as the impact wrench B, and has an O-ring 7e formed by connecting the rotating normer support 5b and the hammer body 46 '. With the structure in which the shaft pins 47 'are directly in contact with each other, the mounting of the shaft pin 47' becomes easy, and as a result, the assembling work becomes easy.
- the O-ring 7e may be one or may be attached to the hammer receiving portions 57, 58.
- FIGS. 8 and 9 show a fourth embodiment of an impact wrench according to the present invention.
- the impact wrench D is provided with a hammer body 40 of a hammer 4d and an O-ring 7e of a hammer 4c, instead of the O-ring 7e of the hammer 4c.
- the countersunk hole 40a which forms a part of the attitude holding means is symmetrical
- the impact is the same as described above, except that two locking members 8 are provided in the hammer receiving portion 58 ′ of the rotary hammer support 5 c on the anvil 6 side of the rotating hammer support 5 c and constitute the rest of the posture holding means. It is the same as wrench C.
- the locking member 8 includes a knock spring (coil spring) 81 and a steel ball 82 fixed to one end of the knock spring 81 by a force or the like, and is formed in the hammer receiving portion 58 ′.
- the knock spring 81 is inserted into the drilled hole 83 with the knock spring 81 as a tip, and the steel ball 82 is urged by the knock spring 81 so as to be constantly pressed against the side surface of the hitting portion 42 (43) of the hammer body.
- the impact wrench D takes the striking part 42 (43)
- the steel ball 82 of the locking member 8 corresponding to the countersunk hole 40a is fitted, the steel ball 82 locks the hammer body 40 so as not to swing, and maintains the posture of the hammer body 40.
- the steel ball 82 of the locking member 8 on the 43 (42) side is released from being locked to the corresponding dish hole 40a, and the striking portion 43 ( It comes into a state of being pressed against the wall of 42)!
- the impact wrench D is configured as described above.
- the steel ball 82 of the locking member 8 is fitted into the countersunk hole 40a in the forward rotation direction hitting portion 42 (43).
- the striking portions 65 and 66 are struck while the striking portions 42 and 43 do not swing and maintain the striking posture.
- the repulsive force of the impact when rebounding after the impact and the force of pushing the wall of the cam groove 31a of the driver 3 in the forward direction by the rotational force of the air motor 2 cause the impact in the forward direction.
- the locking of the locking member 8 to the countersunk hole 40a of the portion 42 (43) by the steel pole 82 is released, and the striking portion 42 (43) in the forward rotation direction rises until the striking portion 42 (43) becomes the non-striking posture.
- the steel ball 82 of the other locking member 8 is fitted into the countersunk hole 40a of the hitting portion 43 (42) in the reverse rotation direction, and the hammer body 40 is locked so as not to swing.
- the impact portion 42 (43) in the forward rotation direction is maintained in the non-impact position.
- the hammer body 40 is swung, and the striking portion 42 (43) in the forward rotation direction assumes the striking posture, and at the same time, the countersunk hole 40a of the striking portion 42 (43) in the forward rotation direction is The steel ball 82 is fitted again, and the hitting portion 42 (43) in the forward rotation direction is held in the hitting posture.
- the hitting portion 42 (43) in the forward rotation direction as described above assumes the hitting posture, and the hammer 4d moves the hitting portion 42 (43) in the forward rotation direction by the locking by the locking member 8. While maintaining the striking posture, the rotor rotates while further accelerating, and strikes the receiver 65 (66).
- the impact wrench D can quickly and efficiently tighten and loosen screws such as bolts and nuts.
- an elastic body such as a rubber elastomer may be used in place of the knock spring 81.
- the impact wrench working on the present invention is not limited to the above embodiment.
- the impact wrench A described above may have a structure in which the O-ring 7a and the O-ring 7b are provided or only one of the O-rings!
- a frictional resistance value is adjusted by an O-ring or the like as in the impact wrench A as in the impact wrench A, in which the bearing hole 57a of the rotating normal support 5b is not provided with an O-ring. It doesn't matter! / ⁇ .
- the air motor 2 is used as the motor, but another motor such as an electric motor (including a rechargeable motor) may be used.
- a countersunk hole is provided on the hammer main body side and a locking member is provided on the hammer receiving portion side, but may be reversed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004080041A JP2005262396A (ja) | 2004-03-19 | 2004-03-19 | インパクトレンチ |
JP2004-080041 | 2004-03-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005090004A1 true WO2005090004A1 (ja) | 2005-09-29 |
Family
ID=34993514
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/000299 WO2005090004A1 (ja) | 2004-03-19 | 2005-01-13 | インパクトレンチ |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP2005262396A (ja) |
TW (1) | TW200600280A (ja) |
WO (1) | WO2005090004A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2435213A2 (en) * | 2009-05-29 | 2012-04-04 | Ingersoll Rand Company | Swinging weight assembly for impact tool |
CN108942853A (zh) * | 2018-09-05 | 2018-12-07 | 上海运征机电科技有限公司 | 一种带直流撞击式电动扳手的智能装配小车 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI549784B (zh) * | 2015-08-28 | 2016-09-21 | 王奕柔 | 動力工具錘打組 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3661217A (en) * | 1970-07-07 | 1972-05-09 | Spencer B Maurer | Rotary impact tool and clutch therefor |
US4683961A (en) * | 1984-12-21 | 1987-08-04 | Atlas Copco Aktiebolag | Hydraulic torque impulse motor |
US6070674A (en) * | 1998-06-11 | 2000-06-06 | Chicago Pneumatic Tool Company | Modified cage member for an impact mechanism |
-
2004
- 2004-03-19 JP JP2004080041A patent/JP2005262396A/ja active Pending
-
2005
- 2005-01-13 WO PCT/JP2005/000299 patent/WO2005090004A1/ja active Application Filing
- 2005-03-18 TW TW094108267A patent/TW200600280A/zh unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3661217A (en) * | 1970-07-07 | 1972-05-09 | Spencer B Maurer | Rotary impact tool and clutch therefor |
US4683961A (en) * | 1984-12-21 | 1987-08-04 | Atlas Copco Aktiebolag | Hydraulic torque impulse motor |
US6070674A (en) * | 1998-06-11 | 2000-06-06 | Chicago Pneumatic Tool Company | Modified cage member for an impact mechanism |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2435213A2 (en) * | 2009-05-29 | 2012-04-04 | Ingersoll Rand Company | Swinging weight assembly for impact tool |
EP2435213A4 (en) * | 2009-05-29 | 2013-08-07 | Ingersoll Rand Co | SWINGING WEIGHT ARRANGEMENT FOR A IMPACT TOOL |
CN108942853A (zh) * | 2018-09-05 | 2018-12-07 | 上海运征机电科技有限公司 | 一种带直流撞击式电动扳手的智能装配小车 |
CN108942853B (zh) * | 2018-09-05 | 2021-09-21 | 上海运征机电科技有限公司 | 一种带直流撞击式电动扳手的智能装配小车 |
Also Published As
Publication number | Publication date |
---|---|
TW200600280A (en) | 2006-01-01 |
JP2005262396A (ja) | 2005-09-29 |
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