JP6409315B2 - Hammering machine - Google Patents

Description

  The present invention relates to a striking work machine used for crushing roads and buildings, and more particularly to a striking work machine that strikes a striking element with a striking mechanism and transmits the striking force to a tip tool.

  Conventionally, there has been known a striking work machine that reciprocates a piston as a striking mechanism in a direction along the center line and raises the pressure of a fluid chamber formed between the piston and the striking element to apply a striking force to the striking element. The hitting machine is described in Patent Document 1. The striking work machine described in Patent Literature 1 has a cylindrical case and a cylindrical case, and the case and the case are concentrically connected and fixed. A cylindrical cylinder is provided in the case, and a piston that is movable in a direction along the center line of the cylinder is provided. In addition, a motion conversion mechanism that converts the rotational force of the power source into the reciprocating power of the piston is provided.

  Further, a striker is provided in the cylinder, and the striker is movable in a direction along the center line in the cylinder. In the cylinder, a fluid chamber is formed between the piston and the striker. In addition, a breathing hole that penetrates the cylinder in the radial direction and communicates with the fluid chamber is provided. Furthermore, a cylindrical tip tool holding member is provided from the inside to the outside of the case. The tip tool holding member is disposed concentrically with the cylinder, and the tip tool holding member supports the intermediate member and the tip tool so as to be movable in the direction along the center line.

  When the piston reciprocates in the cylinder by the rotational force of the power source, the pressure in the fluid chamber alternately repeats increasing and decreasing. When the pressure in the fluid chamber rises, the striker moves in a direction approaching the meson, and strikes the meson. When the tip tool is pressed against the object, the striking force applied to the meson is transmitted to the tip tool.

  On the other hand, when the tip tool is not pressed against the object, the intermediate element contacts the tip tool holding member, and movement in the direction along the center line is restricted by the tip tool. For this reason, when a striking force is applied to the intermediate element, the striking force is transmitted to the case via the tip tool holding member.

JP 2002-127043 A

  As described above, when the impact force is transmitted to the case when the tip tool is not pressed against the object, the case is pulled in the direction along the center line and the torsional load in the direction intersecting the center line. Will be added. The striking work machine described in Patent Document 1 has room for improvement rather than a case structure that takes this tensile load and torsional load into consideration.

  An object of the present invention is to provide a striking work machine capable of improving the strength of a case provided with a striking mechanism.

In one embodiment, a fluid chamber whose pressure is changed by the operation of a piston, a striker that operates by the pressure of the fluid chamber, a cylindrical case provided with the fluid chamber and the striker, and a case attached, and a striking working machine and a tool bit retaining member for holding a tool bit to be struck by the striker, projecting from an inner surface of the casing in the radial direction and the side surface of the case And a plurality of ribs inclined with respect to a center line on which the striker operates , and formed on the inner surface of the case between the plurality of ribs, and radially outward from the plurality of ribs. A plurality of recessed portions, wherein the plurality of recessed portions are separated from the tip tool holding member in a direction along the center line in the circumferential direction of the case in a side view of the case. Narrow with It includes a plurality of first concave corner shape, and a plurality of second recesses triangular made wider with the width in the circumferential direction away from the tool bit retaining member of the case.

In another embodiment, a fluid chamber whose pressure is changed by the operation of a piston, a striker that operates with the pressure of the fluid chamber, a cylindrical case provided with the fluid chamber and the striker, and a case An impact tool equipped with a tip tool holding member that holds the tip tool hit by the striker, a motor that reciprocates the piston, and supports the motor; and A plurality of first fixing elements arranged in a circumferential direction around a center line for fixing the housing to which the case is fixed, the tip tool holding member and the case are fixed to each other, and the striker operates A plurality of second fixing elements that fix the case and the housing to each other and are arranged at positions different from the plurality of first fixing elements in a circumferential direction around the center line; Above A plurality of ribs projecting radially from the inner surface of the case and inclined with respect to the center line in a side view of the case, and the plurality of ribs are provided in the side view of the case. It arrange | positions in the position which ties 1 fixing element and the said 2nd fixing element, respectively .

  According to the impact working machine of the present invention, the strength of the case can be increased in a direction inclined with respect to the center line. Therefore, when the striking force is transmitted to the case, it is possible to suppress stress concentration on the case.

It is side surface sectional drawing of the hitting working machine in embodiment of this invention. It is principal part sectional drawing of the striking work machine in embodiment of this invention. (A) is a perspective view of the cylinder case shown in FIG.1 and FIG.2, (B) is sectional drawing of the cylinder case shown in FIG.1 and FIG.2. (I) is a cross-sectional plan view taken along line II in FIG. 2, (II) is a cross-sectional plan view taken along line II-II in FIG. 2, and (III) is a cross-sectional bottom view taken along line III-III in FIG. It is. It is a perspective view of the cylinder case in the hit working machine of a comparative example. (A) is a plane sectional view of the body part of the cylinder case shown in FIG. 5, and (B) is a plan sectional view of the boss part of the cylinder case shown in FIG.

(Embodiment)
Hereinafter, the impact working machine to which the present invention is applied will be described in detail with reference to FIGS. The striking work machine 10 includes a motor case 11 and a cylinder case 12 fixed to the motor case 11. An electric motor 13 is provided in the motor case 11. The electric motor 13 is a power source that converts electric energy into kinetic energy of the output shaft 14. A pinion gear 15 is provided on the output shaft 14 of the electric motor 13.

  An intermediate shaft 16 is provided in the motor case 11, and gears 17 and 18 are provided on the intermediate shaft 16. The number of teeth of the gear 17 is larger than the number of teeth of the pinion gear 15 and the number of teeth of the gear 18. The gear 17 is in mesh with the pinion gear 15. A crankshaft 19 is provided in the motor case 11, and the crankshaft 19 has a gear 20. The number of teeth of the gear 20 is larger than the number of teeth of the gear 18, and the gear 20 meshes with the gear 18. The crankshaft 19 has a pin 21 at a position eccentric from the rotation center line.

  Two handles 22 and 23 are provided outside the motor case 11, and the handles 22 and 23 are respectively attached to the handle holders. The handle holder can be operated within a range of a predetermined angle around the support shaft. One handle 23 is provided with a lever 24. The lever 24 is operated by an operator. A power cable 25 is connected to the handle 23, and the power cable 25 is connected to a commercial power source. When the lever 24 is operated, power is supplied to the electric motor 13 via the power cable 25, and the output shaft 14 rotates. The rotational force of the output shaft 14 is transmitted to the gear 20 via the gear 17 and the gear 18, and the crankshaft 19 rotates.

  When the reduction gear 26 is configured by the gear 17, the gear 18, and the gear 20, and the rotational force is transmitted from the output shaft 14 to the crankshaft 19, the rotational speed of the crankshaft 19 becomes lower than the rotational speed of the output shaft 14, and , The rotational force is amplified.

  The cylinder case 12 is integrally formed of a metal material, for example, aluminum. The cylinder case 12 includes a cylindrical body 12A and bosses 12B and 12C provided at both ends of the body 12A. The trunk portion 12A is disposed around the center line A1. In the radial direction about the center line A1, the thickness of the boss portion 12B is larger than the thickness of the trunk portion 12A, and the thickness of the boss portion 12C is larger than the thickness of the trunk portion 12A.

  The boss portion 12B is provided in an annular shape surrounding the center line A1, and the boss portion 12B has a substantially quadrangular outer peripheral shape in a plane perpendicular to the center line A1. As shown in FIG. 3A, a plurality of shaft holes 12D are provided in the boss portion 12B. The shaft holes 12D pass through the boss portion 12B in the direction along the center line A1, and the plurality of shaft holes 12D are arranged at equal intervals on the same circumference centered on the center line A1. The number of shaft holes 12D is four in the embodiment. The four shaft holes 12D are arranged at locations corresponding to the four corners of the boss portion.

  The boss portion 12B is provided with a plurality of reduced thickness portions 12E. The reduced thickness portion 12E includes a recess, a groove, a recess, and the like that are opened in the end face of the boss portion 12B. The plurality of thinned portions 12E are respectively disposed between the shaft holes 12D. Four screw members 52 that are respectively inserted into the four shaft holes 12 </ b> D are provided, and the cylinder case 12 is fixed to the motor case 11 by the screw members 52. The screw member 52 positions the cylinder case 12 and the motor case 11 to each other in the direction along the center line A1 and fixes them to each other. The motor case 11 is provided with four female screw holes into which the screw members 52 are screwed.

  On the other hand, in the plan view of the cylinder case 12, as shown in FIG. 4 (II), the outer peripheral shape of the boss portion 12C is circular, and a plurality of female screw holes 12F are provided in the boss portion 12C. Within a plane perpendicular to the center line A1, the plurality of female screw holes 12F are arranged at equal intervals on the same circumference centered on the center line A1. On the circumference centered on the center line A1, the position where the plurality of female screw holes 12F are arranged is different from the position where the plurality of shaft holes 12D are arranged. When the cylinder case 12 is viewed in plan, a plurality of female screw holes 12F and a plurality of shaft holes 12D are alternately arranged on a circumference centered on the center line A1. In addition, a plurality of thinned portions 12G are provided in the boss portion 12C. The thinned portion 12G includes a concave portion, a groove, a dent, and the like that are opened toward the trunk portion 12A. The plurality of thinned portions 12G are respectively disposed between the female screw holes 12F.

  Further, as shown in FIGS. 3B and 4I, a plurality of ribs 12H are provided on the inner surface of the cylinder case 12 so as to protrude from the inner surface. The rib 12H connects the boss portion 12B and the boss portion 12C. When the inner surface of the cylinder case 12 is developed, the rib 12H is disposed so as to connect a portion of the boss portion 12B where the shaft hole 12D is disposed and a portion of the boss portion 12C where the female screw hole 12F is disposed. . That is, the rib 12H is inclined with respect to the center line A1 and arranged linearly in a side view of the cylinder case 12. In the present embodiment, a total of eight ribs 12H are provided.

  On the inner surface of the cylinder case 12, a recess 12J is formed between the two ribs 12H and the boss portion 12C. The recess 12J is connected to the thinned portion 12G. On the inner surface of the cylinder case 12, a recess 12K is formed between the two ribs 12H and the boss portion 12B. When the inner surface of the cylinder case 12 is developed and viewed in plan, the side wall 12M that forms the inner edge of the recess 12J and the side wall 12N that forms the inner edge of the recess 12K both form a triangle.

  The recess 12J becomes narrower as the width of the cylinder case 12 in the circumferential direction becomes farther from the holder 30 in the direction along the center line A1. The recess 12K becomes wider as the width of the cylinder case 12 in the circumferential direction increases away from the holder 30 in the direction along the center line A1. In the thickness direction of the cylinder case 12, the depth of the recess 12J and the depth of the recess 12K are the same. In the cylinder case 12, the thickness of the portion where the rib 12H is disposed is larger than the thickness of the portion where the recess 12J is disposed and the thickness of the portion where the recess 12K is disposed.

  A cylindrical cylinder 27 is provided in the cylinder case 12. The cylinder 27 is made of metal, and the cylinder case 12 and the cylinder 27 are arranged concentrically. The center line A1 of the cylinder case 12 and the cylinder 27 is orthogonal to the center line B1 around which the output shaft 14 of the electric motor 13 rotates in a side view of the impact work machine 10. A piston 28 is accommodated in the cylinder 27, and the piston 28 is operable in a direction along the center line A1. A connecting rod 53 is connected to the piston 28, and the connecting rod 53 is rotatably connected to the pin 21. For this reason, when the crankshaft 19 rotates, the piston 28 reciprocates in the cylinder 27 in the direction along the center line A1. The crankshaft 19 and the pin 21 are a motion conversion mechanism that converts the rotational force of the gear 20 into the reciprocating power of the piston 28.

  Further, a striker 29 is provided in the cylinder 27, and the striker 29 is movable in a direction along the center line A1. An air chamber C <b> 1 is formed in the cylinder 27 between the piston 28 and the striker 29.

  Further, a plurality of breathing holes 45 penetrating the cylinder 27 in the radial direction are provided. A space E1 is formed between the cylinder 27 and the cylinder case 12, and the breathing hole 45 connects the space E1 and the air chamber C1. The breathing hole 45 is a passage through which air as a fluid enters and exits the air chamber C1. The space E1 communicates with the outside of the cylinder case 12. In addition, a plurality of idling prevention holes 46 penetrating the cylinder 27 in the radial direction are provided. The blanking prevention hole 46 connects the space E1 and the air chamber C1. The breathing hole 45 is disposed between the idling prevention hole 46 and the motor case 11 in the direction along the center line A1.

  Further, the holder 30 is fixed to the end of the cylinder case 12 opposite to the motor case 11 in the direction along the center line A1. The holder 30 has a cylindrical shape centered on the center line A1, and the holder 30 includes a large diameter portion 30A, a medium diameter portion 30B, and a small diameter portion 30C. The holder 30 is integrally formed of a steel material. The outer diameter of the large diameter portion 30A is larger than the outer diameter of the medium diameter portion 30B, and the outer diameter of the medium diameter portion 30B is larger than the outer diameter of the small diameter portion 30C. A medium diameter portion 30B is disposed between the large diameter portion 30A and the small diameter portion 30C in the direction along the center line A1. A flange 47 protruding from the outer peripheral surface of the large diameter portion 30A is provided. The flange 47 protrudes outward in the radial direction about the center line A1.

  An annular damper 36 is disposed in the large diameter portion 30A, and the damper 36 is integrally formed of a rubber-like elastic material. A sleeve 33 is provided from the large diameter portion 30 </ b> A of the holder 30 to the inside of the cylinder case 12. The sleeve 33 is made of metal, and the sleeve 33 includes a cylindrical portion 34 and a flange portion 35 projecting outward from the outer peripheral surface of the cylindrical portion 34 in the radial direction of the cylindrical portion 34. The flange portion 35 is disposed in the large diameter portion 30 </ b> A, and the cylindrical portion 34 is disposed in the cylinder case 12. The damper 36 is interposed between the flange portion 35 and the cylinder case 12 in a direction along the center line A1. The sleeve 33 is movable within a range in which the damper 36 is elastically deformed in a direction along the center line A1.

  An annular plate 48 is disposed outside the large diameter portion 30A, and a flange 47 is disposed between the plate 48 and the cylinder case 12 in a direction along the center line A1. The flange 47 is provided with a plurality of shaft holes 47A. The plurality of shaft holes 47A pass through the flange 47 in the direction along the center line A1, and the plurality of shaft holes 47A are arranged at equal intervals on the circumference centered on the center line A1. The number of shaft holes 47A is four.

  The plate 48 and the holder 30 are fixed to the cylinder case 12 by a screw member 31 that is a fixing element. The screw member 31 positions the holder 30 and the cylinder case 12 to each other in the direction along the center line A1 and fixes them to each other. A plurality of screw members 31 are provided, and the screw members 31 are respectively screwed into the female screw holes 12F. The number of screw members 31 is four, which is the same as the number of screw members 52. When the plate 48 is viewed from the bottom as shown in FIG. 4 (III), the location where the screw member 31 is arranged differs from the location where the screw member 52 is arranged on the circumference centered on the center line A1. . Specifically, the screw members 31 and the screw members 52 are alternately arranged along the circumferential direction of the plate 48.

  An intermediate element 37 is provided from the cylinder 27 to the holder 30. The meson 37 is made of metal, and the meson 37 includes a columnar small-diameter portion 38 and a large-diameter portion 39 continuous with the small-diameter portion 38. The outer diameter of the large diameter portion 39 is larger than the outer diameter of the small diameter portion 38, and the small diameter portion 38 is disposed in the cylinder portion 34 and the cylinder 27. The large diameter portion 39 is disposed in the support hole 32 of the holder 30. The support hole 32 is provided in the medium diameter part 30B. The outer diameter of the large diameter portion 39 is larger than the inner diameter of the cylindrical portion 34. The meson 37 is movable in the direction along the center line A1 with respect to the sleeve 33. When the meson 37 moves toward the cylinder case 12 and the large diameter portion 39 contacts the flange portion 35, the meson 37 is moved. Stop.

  On the other hand, a holding hole 42 is provided in the small diameter portion 30 </ b> C, and the holding hole 42 is connected to the support hole 32. The holding hole 42 has a smaller diameter than the support hole 32, and a step portion 49 is formed between the holding hole 42 and the support hole 32. When the meson 37 moves away from the piston 28 in the direction along the center line A1 and the large diameter portion 39 contacts the step portion 49, the meson 37 stops. That is, the meson 37 is restricted from moving in the direction along the center line A <b> 1 in a direction away from the piston 28. A stopper 50 is provided in the small diameter portion 30C. The stopper 50 is bent in a U shape, and the stopper 50 is attached to the small diameter portion 30 </ b> C so as to be rotatable about the support shaft 51. The stopper 50 has a receiving portion 50A. 50 A of receiving parts are extended in the direction which cross | intersects centerline A1.

  Further, the holder 30 holds a tip tool 43. The tip tool 43 is formed by molding a metal material into a rod shape, and the tip tool 43 is disposed in the support hole 32 and the holding hole 42. A locking portion 44 is provided at a midway position in the length direction of the tip tool 43. The tip tool 43 is movable in the direction along the center line A <b> 1 while being held by the holder 30, and a portion of the tip tool 43 disposed in the support hole 32 contacts the intermediate element 37. An example of the overall length and mass of the impact work machine 10 is the total length in the direction along the center line A1, for example, the length from the upper end of the motor case 11 to the distal end of the tip tool 43 is 1 m, and the mass is 30 kg.

  Next, an example in which the worker uses the impact work machine 10 will be described. First, as shown in FIG. 1, when the end portion of the tip tool 43 is pressed against the object W1, the intermediate piece 37 is pushed by the tip tool 43, the large diameter portion 39 comes into contact with the flange portion 35, and the intermediate piece 37 stops. When the operator operates the lever 24, the output shaft 14 of the electric motor 13 rotates, and the piston 28 reciprocates in the direction along the center line A1 in the cylinder 27. That is, the rotational force of the output shaft 14 is converted into the reciprocating power of the piston 28.

  When the piston 28 rises, the pressure in the air chamber C1 becomes lower than the pressure in the space E1, and the air in the space E1 passes through the breathing hole 45 and is sucked into the air chamber C1, and the striker 29 rises. . The piston 28 moves up is to move in a direction approaching the crankshaft 19 in a direction along the center line A1. When the striker 29 rises, the striker 29 moves in a direction away from the intermediate element 37 in the direction along the center line A1.

  When the striker 29 rises, the breathing hole 45 is closed by the striker 29 and air is not sucked into the air chamber C1. When the piston 28 reaches the top dead center and the piston 28 descends from the top dead center, the pressure in the air chamber C1 rises and a striking force is applied to the striker 29 according to the pressure in the air chamber C1. . For this reason, the striker 29 descends in a direction approaching the intermediate element 37, and the striker 29 strikes the intermediate element 37. The striking force applied to the meson 37 is transmitted to the object W1 via the tip tool 43, and operations such as crushing the object W1, crushing work, and the like can be performed. The striking force applied to the meson 37 and the tip tool 43 is the direction along the center line A1.

  The breathing hole 45 is opened immediately before the striker 29 strikes the intermediate element 37, and until the piston 28 reaches the bottom dead center, the air in the air chamber C1 passes through the breathing hole 45 and is discharged to the space E1. When the striking force is transmitted from the meson 37 to the tip tool 43 and the piston 28 reaches the bottom dead center, the piston 28 moves from the bottom dead center toward the top dead center. Thereafter, while the output shaft 14 of the electric motor 13 is rotating, the pressure of the air chamber C1 is changed by repeatedly raising and lowering the piston 28 and raising and lowering the striker 29. Therefore, the striking force of the striking element 29 is intermittently transmitted to the tip tool 43 via the intermediate element 37.

  When the end portion of the tip tool 43 is not pressed against the object W1, the intermediate piece 37 is lowered by its own weight, and the large diameter portion 39 comes into contact with the stepped portion 49 and the intermediate piece 37 stops as shown in FIG. The striker 29 also descends by its own weight, and the striker 29 comes into contact with the intermediate element 37 and stops. In other words, both the breathing hole 45 and the idling prevention hole 46 are opened. Further, the locking portion 44 is engaged with the receiving portion 50A of the retaining member 50, and the tip tool 43 is supported. For this reason, the tip tool 43 does not come out of the holder 30. Note that when the retainer 50 is rotated, the locking portion 44 is not engaged with the retainer 50, so that the tip tool 43 can be removed from the holder 30.

  Next, an example in which the lever 24 is operated in a state where the end portion of the tip tool 43 is not pressed against the object W1 will be described. In this case, since the blanking prevention hole 46 is opened, even if the piston 28 reciprocates in the direction along the center line A1, the blanking prevention hole 46 is closed by the pressure in the air chamber C1. Lower than the pressure of the case. Therefore, the striking force applied to the striking element 29 is lower than the striking force generated when the tip tool 43 is pressed against the object W1.

  The striking force applied to the striking element 29 is transmitted to the step portion 49 via the intermediate element 37. For this reason, the load of the direction which leaves | separates the holder 30 from the cylinder case 12 is added. That is, the holder 30 receives external force from the striker 29 and the intermediate element 37. The external force received by the holder 30 is transmitted to the cylinder case 12 via the screw member 31.

  As described above, the cylinder case 12 has the boss portion 12 </ b> B fixed to the motor case 11 using the screw member 52. In the motor case 11, an electric motor 13, gears 17, 18 and the like as heavy objects are disposed. For this reason, when an external force is transmitted from the holder 30 to the motor case 11 and the motor case 11 vibrates in the direction along the center line A1, the motor case 11 as a structure by the inertial force in the direction along the center line A1. The movement occurs later than the movement of the cylinder case 12. Therefore, a tensile load in a direction along the center line A1 is applied to the cylinder case 12, and stress may concentrate.

  As shown in FIG. 3B, the tensile load applied to the cylinder case 12 is an action line F1 in a direction connecting the portion where the screw member 52 is attached to the boss portion 12B and the portion where the screw member 31 is attached to the boss portion 12C. Along the line. The cylinder case 12 of the present embodiment has ribs 12H along the action line F1, and the strength or rigidity is increased as compared with a portion where the action line F1 does not pass. Here, “along the action line F1” means that the rib 12H is arranged such that the action line F1 is located in the arrangement area of the rib 12H. Therefore, since the rib 12H mainly receives the tensile load applied to the cylinder case 12 and the torsional load in the direction intersecting with the center line A1, the life of the impact working machine 10 can be extended.

  Further, when the inner surface of the cylinder case 12 is developed, the ribs 12H and the boss portions 12B are arranged in a triangular shape. The triangular reinforcing structure, which is the minimum unit of a figure, can withstand loads from all directions, as represented by a truss structure or the like.

  Further, the boss portion 12C is provided with a reduced thickness portion 12G, and the boss portion 12B is provided with a reduced thickness portion 12E. For this reason, the metal material which comprises the cylinder case 12 can be decreased, and it becomes possible to achieve both high rigidity and high strength of the cylinder case 12 and light weight.

  Further, the rib 12H is provided on the inner surface of the cylinder case 12, and no irregularities are formed on the outer surface of the cylinder case 12. Therefore, when an operator moves the impact work machine 10, the knee may be applied to the outer surface of the cylinder case 12. In such a case, even if the knee is applied to the outer surface of the cylinder case 12, It is possible to avoid an increase in contact pressure per unit area with the cylinder case 12, and it is difficult for an operator to feel fatigue and workability is improved.

  The relationship between the configuration described in the present embodiment and the configuration of the present invention will be described. The air chamber C1 corresponds to the fluid chamber of the present invention, the cylinder case 12 corresponds to the case of the present invention, and the motor case. 11 corresponds to the housing of the present invention, and the holder 30 corresponds to the tip tool holding member of the present invention. The electric motor 13 corresponds to the motor of the present invention, the screw member 31 and the female screw hole 12F correspond to the first fixing element of the present invention, and the screw member 52 and the shaft hole 12D correspond to the second fixing of the present invention. It corresponds to an element, the action line F1 corresponds to the connecting position of the present invention, the boss portion 12C corresponds to the first boss portion of the present invention, and the boss portion 12B corresponds to the second boss portion of the present invention. . Further, the thinned portion 12G corresponds to the first thinned portion of the present invention, the thinned portion 12E corresponds to the second thinned portion of the present invention, and the meson 37 is an impact force transmitting member of the present invention. The step 49 corresponds to the stopper of the present invention. Further, the recesses 12J and 12K correspond to the recesses of the present invention, the recess 12J corresponds to the first recess of the present invention, and the recess 12K corresponds to the second recess of the present invention. Further, the crankshaft 19 and the pin 21 correspond to the motion conversion mechanism of the present invention.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, a motor that is a power source for generating a striking force includes an electric motor, a hydraulic motor, a pneumatic motor, an engine, and the like. That is, the rotational force of the motor is converted into the reciprocating force of the piston, and a striking force is generated. Furthermore, the number of fixed elements can be set arbitrarily. Further, the hitting machine includes a structure capable of applying a hitting force and a rotating force to the tip tool in addition to a structure in which a hitting force is applied to the tip tool in a direction along the center line.

  The striking work machine of the present invention includes a structure that applies a striking force to a tip tool for drilling, such as concrete or stone. The striking work machine of the present invention includes a structure that applies a striking force to the tip tool to harden the ground. Furthermore, the impact working machine of the present invention includes a structure in which a tip tool is impacted to form a hole or a groove in the object, or a corner is formed in the object.

  Furthermore, the fixing element in the present invention includes a combination of a stud bolt and a nut in addition to a combination of a screw member and a female screw hole. Furthermore, the motion conversion mechanism that converts the rotational force of the output shaft of the motor into the reciprocating power of the piston includes a structure using a cam mechanism in addition to a structure using a crankshaft. Furthermore, the impact working machine of the present invention has a structure in which the center line of the output shaft of the motor and the center line of the piston operating direction intersect with each other, the center line of the motor output shaft, and the piston It includes a structure in which the center line in the movement direction is arranged in parallel. The rib in the present invention may be provided on the outer surface of the case. That is, the rib should just protrude in the radial direction from the surface of the case. Furthermore, the impact working machine of the present invention includes a structure in which a battery pack that supplies power to the electric motor can be attached to and detached from the case.

  Further, the striking mechanism according to the present invention strikes the striking element with the elastic force of the spring in addition to the first means for converting the rotational force of the motor into the reciprocating power of the piston and striking the striking element with the pressure of the fluid chamber. And second means for striking the striker with the pressure of compressed air. The second means is a mechanism that operates the striker against the elastic force of the spring with the power of the motor, then lowers the power of the motor transmitted to the striker and strikes the striker with the elastic force of the spring. is there. The third means has an air chamber that generates pressure for striking the striker, a compressed air passage connected to the air chamber, a valve that opens and closes the passage, and strikes the striker by opening and closing the valve. Mechanism.

  The rib in the present invention is a structure for increasing the strength of the case in the direction along the center line. The motor in the present invention is a power source for operating the piston. The fixing element in the present invention positions the case and the case in a direction along the center line, and fixes the case to each other. The thinned portion in the present invention is formed for the purpose of reducing the weight and reducing the material constituting the case in the configuration in which the strength of the case is increased.

(Comparative example)
A cylinder case used in the impact working machine of the comparative example will be described with reference to FIGS. 5 and 6A and 6B. The cylinder case 100 includes a cylindrical body 101 and bosses 102 and 103 formed at both ends of the body 101. A plurality of shaft holes 104 are provided in the boss portion 102, and screw members 105 are respectively inserted into the plurality of shaft holes 104 to fix the cylinder case 100 to the case. A plurality of female screw holes 109 are provided in the boss portion 103, and a plurality of screw members 106 inserted into the female screw holes 109 are provided. The plurality of screw members 106 fix the holder to the boss portion 103.

  Ribs 107 are provided on the outer surface of the body 101 in a direction along the center line D1. The rib 107 protrudes from the outer surface of the body portion 101. A plurality of ribs 107 are arranged along the circumferential direction of the body portion 101. The ribs 107 are arranged in parallel. The boss portion 103 is provided with a plurality of thickness reducing portions 108. The thinned portion 108 is opened on the outer peripheral surface of the boss portion 103. In the circumferential direction of the cylinder case 100, the thinned portions 108 and the female screw holes 109 are alternately arranged.

  In the impact working machine of the comparative example, the rib 107 and the thinned portion 108 are provided on the outer surface of the cylinder case 100, and irregularities exist on the outer surface of the cylinder case 100. For this reason, when an operator's knee contacts the outer surface of the cylinder case 100, the contact pressure per unit area between the knee and the outer surface of the cylinder case 100 increases. Therefore, the worker feels pain and the working efficiency is remarkably lowered.

  DESCRIPTION OF SYMBOLS 10 ... Blow work machine, 11 ... Motor case, 12 ... Cylinder case, 12A ... Trunk part, 12B, 12C ... Boss part, 12D ... Shaft hole, 12E, 12G ... Thinning part, 12F ... Female screw hole, 12H ... Rib, 12J, 12K ... concave portion, 12M, 12N ... side wall, 28 ... piston, 29 ... striker, 30 ... holder, 31, 52 ... screw member, 37 ... meson, 43 ... tip tool, 49 ... step, A1 ... center line , C1 ... air chamber, F1 ... action line.

Claims (10)

A fluid chamber whose pressure is changed by the operation of the piston, a striking element that operates with the pressure of the fluid chamber, a cylindrical case provided with the fluid chamber and the striking element, attached to the case, and An impact tool including an end tool holding member for holding an end tool hit by the striker,
Projecting from an inner surface of the casing in the radial direction and, when viewed from the side of the case, a plurality of ribs which are inclined with respect to the center line of the striker is operated,
A plurality of recesses formed between the plurality of ribs on the inner surface of the case and recessed outward in the radial direction from the plurality of ribs; and
The plurality of recesses are
In a side view of the case, a plurality of triangular first recesses whose width in the circumferential direction of the case becomes narrower as the distance from the tip tool holding member in the direction along the center line decreases.
A plurality of triangular second recesses, the width of the case in the circumferential direction becoming wider as the distance from the tip tool holding member increases;
Including a blow work machine. A fluid chamber whose pressure is changed by the operation of the piston, a striking element that operates with the pressure of the fluid chamber, a cylindrical case provided with the fluid chamber and the striking element, attached to the case, and An impact tool including an end tool holding member for holding an end tool hit by the striker,
A motor for reciprocating the piston;
A housing that supports the motor and to which the case is fixed;
A plurality of first fixing elements arranged in a circumferential direction around a center line for fixing the tip tool holding member and the case to each other and operating the striker;
A plurality of second fixing elements that fix the case and the housing to each other and are arranged at positions different from the plurality of first fixing elements in a circumferential direction around the center line;
A plurality of ribs protruding radially from the inner surface of the case and inclined with respect to the center line in a side view of the case;
Is provided,
The striking work machine, wherein the plurality of ribs are arranged at positions connecting the first fixing element and the second fixing element, respectively, in a side view of the case . The striking work machine according to claim 2, wherein the number of the first fixed elements and the number of the second fixed elements are the same . The case is
A trunk surrounding the centerline;
A first boss part and a second boss part connected to both ends of the body part in a direction along the center line;
With
The plurality of ribs are provided on an inner surface of the body portion,
The first fixing element fixes the first boss portion and the tip tool holding member to each other,
The second fixing element fixes the second boss portion and the housing to each other,
The impact working machine according to claim 2 or 3, wherein the first boss portion includes a first thinning portion, and the second boss portion includes a second thinning portion . A striking force transmission member for transmitting the striking force of the striking element to the tip tool is provided,
5. The tool according to claim 2, wherein the tip tool holding member includes a stopper that restricts the striking force transmission member from moving in a direction along the center line in a direction away from the piston. 6. The hitting work machine described. The striking work machine according to claim 2 , further comprising a plurality of recesses formed between the plurality of ribs on the inner surface of the case and recessed outward in the radial direction from the plurality of ribs . A plurality of first fixing elements for fixing the tip tool holding member to the case are provided in a circumferential direction around the center line;
The impact working machine according to claim 1, wherein the plurality of first recesses are respectively disposed between the plurality of first fixing elements in the circumferential direction . A motor for reciprocating the piston;
A housing that supports the motor and is fixed to the case;
A plurality of second fixing elements that fix the case to the housing and that are arranged at positions different from the plurality of first fixing elements in the circumferential direction;
Is provided,
The impact working machine according to claim 7, wherein the plurality of second recesses are respectively disposed between the plurality of second fixing elements in the circumferential direction . The case is
A body part surrounding the center line, and a first boss part and a second boss part connected to both ends of the body part in a direction along the center line;
With
The plurality of recesses are provided on the inner surface of the body part,
The first fixing element fixes the first boss portion and the tip tool holding member to each other,
The second fixing element fixes the second boss portion and the housing to each other,
The first boss part includes a first thinning part,
The second boss part includes a second thinning part,
The impact working machine according to claim 8, wherein the first recess is connected to the first thinning portion . A striking force transmission member for transmitting the striking force of the striking element to the tip tool is provided,
10. The tool according to claim 7, wherein the tip tool holding member includes a stopper that restricts the striking force transmission member from moving in a direction along the center line in a direction away from the piston. The hitting work machine described.

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