JP2017013170A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working machine capable of preventing foreign objects from entering into a mounting hole.SOLUTION: A working machine that rotates a working tool with power of an electric motor and comprises: a front case 25 which supports the working tool; a gripping tool 36 attached to the front case 25 and gripped by a worker; a mounting hole 41 provided at the front case 25 and to which the gripping tool 36 is attached; and a cap 67 which closes the mounting hole 41 in a state where the gripping tool 36 is not attached to the mounting hole 41.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a working machine that rotates a work tool with the power of a motor.

  2. Description of the Related Art Conventionally, a work machine that rotates a work tool with the power of a motor is known, and an example of the work machine is described in Patent Document 1. The working machine described in Patent Literature 1 includes a main body and a handle as a gripping tool attached to the main body. The main body has a housing that houses the motor, and a grip that is continuous with the housing.

  Moreover, the working machine described in patent document 1 has a holder for attaching or detaching a handle to the main body. The holder has a ring shape having a notch, and the handle is fixed to the holder using bolts and nuts. The ring-shaped holder is attached to the outer peripheral surface of the housing. A mounting hole is provided in the holder, and a shaft portion of the bolt is disposed in the mounting hole. The handle has a cylindrical shape, and a nut is provided in the handle. The working machine described in Patent Document 1 can be attached to and detached from the main body by rotating a bolt.

JP 2012-96299 A

  On the other hand, there is a working machine in which a mounting hole is provided in the main body as a configuration in which the handle is attached to and detached from the main body. In the working machine having this configuration, the handle is screwed into the direct mounting hole without using the ring-shaped holder. In the working machine configured as described above, it is considered that foreign matter may enter the mounting hole into which the handle is screwed.

  An object of the present invention is to provide a working machine capable of preventing foreign matter from entering a mounting hole.

  The present invention is a work machine that rotates a work tool with the power of a motor, and is provided in the main body, a main body that supports the work tool, a gripping tool that is attached to the main body and that is gripped by an operator, And it has the attachment hole which attaches the said holding tool, and the sealing member which plugs up the said attachment hole in the state which is not attached to the said attachment hole.

  The present invention can prevent foreign matter from entering the mounting hole.

It is a perspective view in the state where the working machine of the present invention was assembled. It is a front view of the working machine of FIG. It is side surface sectional drawing which shows the internal structure of the working machine of FIG. It is side surface sectional drawing which shows the grip of the working machine of FIG. It is front sectional drawing which shows the example which attaches a holding tool to the working machine of FIG. It is front sectional drawing which decomposed | disassembled the holding | gripping tool. It is the perspective view which decomposed | disassembled the holding | gripping tool. (A) is a top view of the cap attached to the working machine, and (B) is a side view of the cap. (A) is a side view of a state where the plug of the cap is removed from the mounting hole, and (B) is a perspective view of the cap alone. (A)-(C) are front sectional drawings which show the process in which a cap is removed and a holding tool is attached to a front case. (A) is a side view of the mount member attached to the working machine of FIG. 1, and (B) is a side sectional view of the mount member. It is front sectional drawing which shows the example which attaches a holding | gripping tool to a front case. (A) is front sectional drawing which shows the example which attaches a holding tool to a front case, (B) is a side view of the mount member shown to FIG. 13 (A). (A) is a side view which shows the example which attaches a holding tool to a mounting part, (B) is a side view of the mounting part which can attach a holding tool. (A), (B) is sectional drawing in the EE line | wire of FIG. 14 (A).

  Hereinafter, embodiments of a working machine according to the present invention will be described in detail with reference to the drawings.

  1 to 3 includes a main body 11, an electric motor 12 provided in the main body 11, a chuck 13 which is disposed outside the main body 11 and to which torque of the electric motor 12 is transmitted. It is equipped with. A driver bit or a drill bit as a work tool can be attached to and detached from the chuck 13. The main body 11 includes a housing 14 and a grip 15 that is continuous with the housing 14. The grip 15 is provided for the operator to hold the work machine 10. A mounting portion 16 is provided at the end of the grip 15 opposite to the housing 14, and the battery pack 17 can be attached to or detached from the mounting portion 16.

  The battery pack 17 is a case that houses battery cells. As the battery cell, a lithium ion battery, a nickel hydrogen battery, a lithium ion polymer battery, a nickel cadmium battery, or the like can be used. As shown in FIG. 4, a control unit 18 is provided in the mounting unit 16, and the control unit 18 controls the voltage, current magnitude, and the like applied from the battery pack 17 to the electric motor 12. By this control, the rotation direction, rotation speed, and torque of the rotating shaft 20 of the electric motor 12 are controlled.

  The electric motor 12 is a power device that converts electric power into power. As shown in FIG. 3, the electric motor 12 includes a stator 19 fixed to the housing 14 and a rotor 21 that is rotatably provided in the housing 14. The stator 19 has a coil to which a voltage is applied, and the rotor 21 has a permanent magnet. The rotor 21 is fixed to the rotary shaft 20, and two bearings 22 and 23 that rotatably support the rotary shaft 20 are provided in the housing 14. The rotation center of the rotation shaft 20 is the axis A1.

  A rear case 24 is provided in the housing 14, and a front case 25 exposed outside the housing 14 is provided. The rear case 24 is disposed between the electric motor 12 and the front case 25 in a direction along the axis A1. A partition wall 26 is provided in the housing 14, and the partition wall 26 is disposed between the electric motor 12 and the rear case 24 in a direction along the axis A1. The partition wall 26 supports the bearing 23.

  The front case 25 and the rear case 24 do not rotate with respect to the housing 14. The front case 25 is fixed to the housing 14 using a screw member 74. Both the front case 25 and the rear case 24 are cylindrical. The rear case 24 and the front case 25 are made of metal, for example, aluminum, and the rigidity of the rear case 24 and the front case 25 is higher than the rigidity of the housing 14. A transmission 27 is disposed in the front case 25 and the rear case 24. The rear case 24 and the front case 25 may be formed of the same resin as the housing 14 as long as rigidity can be ensured.

  The transmission device 27 includes a first planetary gear mechanism 28, a second planetary gear mechanism 29, and a third planetary gear mechanism 30. The first planetary gear mechanism 28 and the second planetary gear mechanism 29 are disposed in the rear case 24. The third planetary gear mechanism 30 is disposed in the front case 25. The first planetary gear mechanism 28, the second planetary gear mechanism 29, and the third planetary gear mechanism 30 each include an input element, a reaction force element, and an output element. The rotating shaft 20 is connected to an input element of the first planetary gear mechanism 28. The output element of the third planetary gear mechanism 30 is connected to the spindle 31, and the chuck 13 is attached to the spindle 31.

  Two bearings 78 that rotatably support the spindle 31 are provided in the front case 25. That is, the main body 11 supports the spindle 31 and the chuck 13 via the front case 25 and the bearing 78. The transmission 27 is a transmission mechanism that transmits the rotational force of the electric motor 12 to the spindle 31, and the transmission 27 changes the ratio between the rotational speed of the rotary shaft 20 and the rotational speed of the spindle 31.

  The power transmitted from the electric motor 12 to the first planetary gear mechanism 28 is transmitted to the spindle 31 via the second planetary gear mechanism 29 and the third planetary gear mechanism 30. When transmitted from the second planetary gear mechanism 29 to the spindle 31 via the third planetary gear mechanism 30, a reaction force element of the third planetary gear mechanism 30, for example, a ring gear, takes charge of the reaction force torque.

  The front case 25 has a first cylinder part 32 and a second cylinder part 33. As shown in FIG. 7, a plurality of boss portions 75 protruding from the outer peripheral surface of the first cylinder portion 32 are provided, and holes 76 are provided in the plurality of boss portions 75, respectively. The screw members 74 are inserted into the plurality of holes 76, respectively. The outer diameter of the first cylinder part 32 is larger than the outer diameter of the second cylinder part 33. The third planetary gear mechanism 30 is disposed in the first cylindrical portion 32, and the spindle 31 is disposed from the first cylindrical portion 32 to the second cylindrical portion 33. A clutch dial 34 is attached to the front case 25. The clutch dial 34 is rotatable with respect to the front case 25.

  The reaction element of the third planetary gear mechanism 30 is provided so as to be rotatable with respect to the front case 25, and the reaction element can be fixed to the front case 25. That is, the front case 25 supports the third planetary gear mechanism 30 located on the most downstream side in the power transmission path from the electric motor 12 to the spindle 31. When the clutch dial 34 is operated, the rotational speed of the reaction force element of the third planetary gear mechanism 30 is adjusted, and the torque output from the spindle 31 can be adjusted.

  Next, a usage example of the work machine 10 will be described. A changeover switch that switches the rotation direction of the rotating shaft 20 of the electric motor 12 between forward rotation and reverse rotation is provided in the main body 11. The changeover switch is operated by an operator, and an operation signal of the changeover switch is input to the control unit 18. The control unit 18 changes the direction of the current supplied to the coil of the electric motor 12 and switches the rotation direction of the rotary shaft 20.

  Further, a trigger 35 is provided in the grip 15, and a trigger switch 77 is provided in the grip 15. The trigger switch 77 is disposed between the housing 14 and the mounting portion 16 in the direction of the straight line A3. When the operator operates the trigger 35, the trigger switch 77 is turned on or off, and a signal output from the trigger switch 77 is input to the control unit 18. The control unit 18 outputs a control signal for connecting or blocking a path for supplying current to the stator 19 of the electric motor 12.

  During the operation of driving the electric motor 12 to rotate the work tool, a moment about the axis A <b> 1 is generated with respect to the housing 14. The work machine 10 includes a gripping tool 36 illustrated in FIGS. 1, 2, and 5 to 7. The gripping tool 36 is provided to prevent the main body 11 from vibrating in a direction that rotates about the axis A1. The vibration of the main body 11 is to rotate about the axis A1. The gripping tool 36 has a joint 37 and a handle 38. The work machine 10 also has a mount member 39. The mount member 39 supports the gripping tool 36 attached to the main body 11. The first end of the joint 37 is attached to the front case 25, the mount member 39 supports the joint 37, and the handle 38 is attached to the second end of the joint 37.

  In FIG. 2 when the work machine 10 is viewed from the front, a fixing portion 40 is provided at a location opposite to the location where the grip 15 is disposed in the circumferential direction of the front case 25. The place where the fixing portion 40 is provided is the opposite side of the place where the grip 15 is disposed with the axis A1 therebetween. The fixed portion 40 has a mounting hole 41 that penetrates in a plane direction perpendicular to the axis A1. The attachment hole 41 is disposed outside the third planetary gear mechanism 30 in the radial direction centered on the axis A1. A female screw 42 is formed on the inner surface of the mounting hole 41. The fixed portion 40 includes concave portions 43 and 44 connected to the attachment hole 41 on both sides of the attachment hole 41 in the direction of the center line A2.

  Further, as shown in FIGS. 6 and 7, the fixing portion 40 includes a contact surface 45 that surrounds the two concave portions 43 and 44. The two contact surfaces 45 are flat and are inclined with respect to a straight line A3 passing through the axis A1. The straight line A3 passes through the center of the grip 15 and the axis A1 in FIG. That is, the grip 15 protrudes from the housing 14 in the direction of the straight line A3 when the work machine 10 is viewed from the front. Further, as shown in FIGS. 5 and 6, the intersection B1 between the center line A2 and the straight line A3 is the center of the mounting hole 41 in the direction of the center line A2. The two contact surfaces 45 are inclined in such a direction that the distance in the direction of the center line A2 becomes narrower as the distance from the straight line A3 increases. That is, the two contact surfaces 45 are opposite to each other in the inclination direction with respect to the straight line A3.

  The joint 37 is a shaft that connects the handle 38 and the front case 25, and the joint 37 is made of a metal material, for example, a steel material. In the joint 37, the first shaft portion 46 and the second shaft portion 47 are continuously arranged in the direction of the center line A2, and the outer diameter of the first shaft portion 46 is smaller than the outer diameter of the second shaft portion 47. . An annular groove 48 is provided on the outer periphery of the second shaft portion 47. The first shaft portion 46 is inserted into the mounting hole 41, and a male screw 49 is formed on the outer peripheral surface of the first shaft portion 46. The first shaft portion 46 is screwed into the mounting hole 41 and the joint 37 is fixed to the front case 25. The joint 37 is arranged from the inside of the mounting hole 41 to the outside. The range in the direction of the center line A2 where the male screw 49 is formed on the first shaft portion 46 is shorter than the length of the mounting hole 41 in the direction of the center line A2.

  In a state where the male screw 49 is screwed into the female screw 42 of the attachment hole 41, a part of the first shaft portion 46 is located outside the attachment hole 41 and the recess 43. In the joint 37, a fixing hole 50 is provided at an end opposite to the first shaft portion 46. A female screw 51 is formed on the inner peripheral surface of the fixing hole 50. The mount member 39 is integrally formed of synthetic resin. The mount member 39 has a cylindrical shape and has a first support hole 52 and a second support hole 53. The inner diameter of the first support hole 52 is smaller than the inner diameter of the second support hole 53. The inner diameter of the first support hole 52 is constant in the direction of the center line A2, and the inner diameter of the second support hole 53 is constant in the direction of the center line A2. That is, no internal thread is provided on the inner surfaces of the first support hole 52 and the second support hole 53.

  A step portion 54 is provided that continues the inner surface of the first support hole 52 and the inner surface of the second support hole 53. The step portion 54 is a flat surface that is formed in an annular shape around the center line A2 and that is perpendicular to the center line A2. Then, in the state where the first shaft portion 46 is disposed in the first support hole 52 and the second shaft portion 47 is disposed in the second support hole 53, the male screw 49 of the first shaft portion 46 is connected to the first support hole 52. Arranged outside.

  In addition, a hole 55 that penetrates a portion corresponding to the second support hole 53 in the radial direction of the mount member 39 is provided, and a stopper 56 is inserted into the hole 55. The retaining member 56 is disposed in the groove 48 in the direction of the center line A2, and the retaining member 56 is engaged with the second shaft portion 47, whereby the mount member 39 and the joint 37 are positioned in the direction of the center line A2. . When the male screw 49 of the joint 37 is screwed into the female screw 42 of the fixing portion 40 and tightening is completed, the gripping tool 36 is positioned and fixed with respect to the front case 25 as shown in FIG. Specifically, the end surface 57 of the second shaft portion 47 is pressed against the step portion 54 of the mount member 39, and the mount member 39 is sandwiched between the fixed portion 40 and the second shaft portion 47. The tip 37A of the joint 37 is located between the recess 44 and the intersection B1 in the direction of the center line A2. That is, the tip 37A is located closer to the recess 44 than the straight line A3.

  Further, as shown in FIGS. 6 and 7, a contact surface 58 that surrounds the opening end of the first support hole 52 in the mount member 39 is provided. The contact surface 58 is flat and is inclined in the same direction as the contact surface 45 of the fixed portion 40. When the mounting member 39 is pressed against the fixing portion 40 and positioned, the mounting member 39 is sandwiched between the fixing portion 40 and the joint 37 with the contact surface 58 in surface contact with the contact surface 45.

  Further, a protrusion 59 is provided on the outer surface of the mount member 39. When the operator positions the mount member 39 on the front case 25, the operator can confirm the position of the mount member 39 in the circumferential direction of the circle centering on the center line A2 by visually checking the protrusion 59.

  The handle 38 includes a main body 60 that is integrally formed of a synthetic resin, and an annular flange 61 that is provided on the main body 60. The flange 61 protrudes outward from the outer peripheral surface of the main body 60. A shaft hole 62 is provided in the main body 60, and a shaft portion 64 of a bolt 63 is disposed in the shaft hole 62. A male screw 65 is formed on the outer peripheral surface of the shaft portion 64, and a part of the shaft portion 64 is disposed outside the main body 60. The center line A <b> 2 is common with the center line of the bolt 63, and the male screw 65 of the bolt 63 is screwed into the female screw 51 of the joint 37.

  That is, the handle 38 is fixed to the joint 37 by tightening the bolt 63. The fixing hole 50 is filled with an adhesive to prevent the bolt 63 from loosening. Further, a metal washer 66 is interposed between the joint 37 and the handle 38. The washer 66 is annular, and the shaft portion 64 of the bolt 63 is passed through the washer 66.

  The gripping tool 36 can give the front case 25 a torque that suppresses the rotation of the front case 25 about the axis A1. The torque that can be generated by the gripping tool 36 is a value corresponding to the arm length of the moment from the axis A1 to the handle 38. The torque that can be generated by the gripping tool 36 is higher as the length of the moment arm is larger. For example, as shown in FIG. 2, the distance L1 from the axis A1 to the flange 61 can be grasped as the length of the moment arm.

  The mount member 39 supports a portion of the first shaft portion 46 where the female screw 49 is not provided and a part of the second shaft portion 47 in the radial direction. That is, the mount member 39 apparently increases the range in which the joint 37 is supported in the direction of the center line A2. For this reason, it is possible to suppress the joint 37 from being elastically deformed in the radial direction at the boundary position between the first shaft portion 46 and the second shaft portion 47.

  The gripper 36 can tighten or loosen the male screw 49 when the operator grasps the handle 38 and rotates the handle 38 and the joint 37 together. That is, the gripping tool 36 can be attached to and detached from the front case 25. Accordingly, the operator can rotate the handle 38 with one hand to perform the work of attaching the gripping tool 36 to the front case 25 and the work of removing it from the front case 25, and the handling and operability of the work machine 10 are improved. To do. Furthermore, since the front case 25 and the joint 37 are fixed by a screw mechanism, the number of parts can be reduced.

  Furthermore, the mount member 39 is partially disposed on the outer peripheral surface of the front case 25, and it is not necessary to surround the outer peripheral surface of the front case 25 in the circumferential direction. Therefore, it can suppress that the working machine 10 enlarges in the radial direction centering on the axis A1. In addition, the working machine 10 according to the present embodiment can be prevented from being enlarged in the direction of the axis A1 with respect to the configuration of the conventional working machine in which the gripping tool is attached to the main body using a ring-shaped holder.

  Further, the front case 25 to which the gripping tool 36 is attached is an element provided to accommodate the third planetary gear mechanism 30. That is, it is not necessary to provide a dedicated element for fixing the gripping tool 36 to the main body 11. Therefore, it is possible to reduce the number of parts of the work machine 10, reduce the weight of the work machine 10, and reduce the manufacturing cost of the work machine 10.

  In addition, the gripper 36 can disassemble the mount member 39 and the joint 37, which pulls out the stopper 56 from the hole 55 in a state where the male screw 49 is loosened and the joint 37 is removed from the front case 25. Therefore, a plurality of types of joints 37 having different lengths in the direction of the center line A2 can be prepared, and the length of the joint 37 to be used can be changed according to the torque generated by the chuck 13. Furthermore, when the mount member 39 is damaged, the mount member 39 can be replaced alone, and the front case 25 and the joint 37 need not be replaced.

  The mounting hole 41 passes through the fixed portion 40 in the direction of the center line A2, and concave portions 43 and 44 are provided on both sides of the mounting hole 41. Therefore, the gripping tool 36 can be attached to the right side of the front case 25 in front view of the work machine 10 in FIG. 2, and the gripping tool 36 can be attached to the front case 25 in front view of the work machine 10 in FIG. 2. It is also possible to attach it to the left side. When the gripping tool 36 is attached to the left side of the front case 25, the first shaft portion 46 may be inserted into the attachment hole 41 from the recess 44.

  In addition, the attachment hole 41 is common when the gripping tool 36 is attached to either the right side or the left side in a front view of the work machine 10. For this reason, it is not necessary to provide a mounting hole separately for the case where the gripping tool 36 is attached to the right side and the case where it is attached to the left side when the work machine 10 is viewed from the front. Therefore, the length of the mounting hole 41 in the direction of the center line A2 can be shortened as much as possible.

  Further, the mounting hole 41 penetrates the fixed portion 40 in the direction of the center line A2. For this reason, in the process of processing the front case 25, the mounting hole 41 can be formed by cutting the front case 25 from one direction with a drill. Therefore, the processing man-hour of the front case 25 can be reduced, the productivity is improved, and the cost of the work machine 10 can be reduced. Furthermore, since the attachment hole 41 penetrates the fixed portion 40 in the direction of the center line A2, the metal material constituting the front case 25 can be reduced, and the work implement 10 can be made as light as possible or as small as possible. .

  Furthermore, one of the factors that determine the fixing strength between the joint 37 and the front case 25 is the connection length between the joint 37 and the fixing portion 40 in the direction of the center line A2. And since the attachment hole 41 has penetrated the fixing | fixed part 40, the connection length of the joint 37 and the fixing | fixed part 40 can be enlarged as much as possible in the centerline A2 direction. For example, when the joint 37 is attached by moving from the first opening of the attachment hole 41 in the direction of the center line A2, the tip 37A of the joint 37 is located between the center in the left-right direction of the attachment hole 41 and the recess 44. The connection length between the joint 37 and the fixed portion 40 can be set so as to be positioned at the position. Here, the first opening is the recess 43 and the second opening is the recess 44. Further, the center of the mounting hole 41 in the left-right direction is an intersection B1 between the straight line A3 and the center line A2. Therefore, the fixing strength between the joint 37 and the front case 25 can be increased.

  Further, the two contact surfaces 45 provided on the fixed portion 40 are inclined with respect to the straight line A3 in such a direction that the distance in the direction of the center line A2 becomes narrower with distance from the axis A1. Therefore, the height of the fixing portion 40 in the direction of the straight line A3 can be made as low as possible, and the fixing portion 40 can be prevented from contacting an object.

  When it is assumed that the inclined portion of the contact surface 45 in the fixed portion 40 is formed on the inner surfaces of the recesses 43 and 44, the thickness from the inner periphery to the outer periphery of the first cylindrical portion 32 of the front case 25 in the direction of the straight line A3. The thickness becomes smaller. For this reason, when a load is applied to the first tube portion 32, the first tube portion 32 is easily damaged. In contrast, the front case 25 of the present embodiment is provided with the contact surface 45 inclined to the outside of the recesses 43 and 44. That is, by leaving a portion with a large thickness in the first tube portion 32, the first tube portion 32 is hardly damaged even when a load is applied to the first tube portion 32. Moreover, by providing the contact surface 45 in the fixed part 40, it can be set as the structure which is hard to be damaged even if the contact surface 45 hits a wall etc. during an operation | work.

  The joint 37 is fixed to the front case 25 via a mount member 39. For this reason, the mount member 39 plays a role of receiving a load in a direction in which the joint 37 intersects the center line A2. Therefore, the joint 37 can be prevented from swinging with the fixed portion 40 as a fulcrum. Further, when the joint 37 is fixed to the fixing portion 40, the contact surface 45 of the fixing portion 40 and the contact surface 58 of the mount member 39 are in surface contact. That is, the contact area between the fixed portion 40 and the mount member 39 can be increased as much as possible, and the function of the mount member 39 supporting the joint 37 is improved.

  Further, a mount member 39 is interposed between the front case 25 and the joint 37 to fix the joint 37 to the front case 25. For this reason, the shape and structure of the mount member 39 may be matched to the shape and structure of the front case 25. That is, the joint 37 can be fixed to the front case 25 regardless of the shape and structure of the front case 25.

  Moreover, the work machine 10 may include a cap 67 shown in FIGS. The cap 67 is a sealing element that closes the attachment hole 41. The cap 67 is integrally formed of synthetic rubber. As shown in FIG. 9, the cap 67 has two grip portions 68, a connection portion 69 that connects the two grip portions 68, and the two grip portions 68. A plug 70 provided and a base 71 provided in the connection portion 69 are provided. The connecting portion 69 can be elastically deformed. A locking groove 72 is provided in the fixed portion 40 of the front case 25, and the base 71 is disposed in the locking groove 72. The base 71 is sandwiched between the fixing portion 40 of the front case 25 and the housing 14, and a cap 67 is attached to the front case 25. The plug 70 is provided with an insertion hole 73 as shown in FIG.

  When the gripping tool 36 is not attached to the front case 25, the operator can insert the plug 70 into the mounting hole 41 from the recesses 43 and 44 by gripping the gripping portion 68 with a finger and elastically deforming the connecting portion 69. . The cap 67 closes the attachment hole 41 as shown in FIG. 10A and prevents foreign matter from entering the attachment hole 41. In other words, the cap 67 protects the female screw 42. Foreign materials include chips and dust.

  When attaching the gripping tool 36 to the front case 25, the operator grasps the grip portion 68 with a finger and pulls out the plug 70 from the mounting hole 41 as shown in FIG. Next, the male screw 49 of the joint 37 is screwed into the female screw 42 of the mounting hole 41, and the gripping tool 36 is fixed to the front case 25 as shown in FIG. Then, the operator presses the grip portion 68 with a finger and fits the projection 59 of the mount member 39 into the hole 73 of the plug 70. Even if the front case 25 vibrates during use of the work implement 10, since the protrusion 59 is fitted into the hole 73, the gripping portion 68 can be prevented from vibrating with the connecting portion 69 as a fulcrum. Therefore, the worker can concentrate on the work without worrying about the presence of the cap 67. Further, it is possible to prevent the grip portion 68 from being disconnected from the connection portion 69 due to vibration.

  The base 71 is sandwiched between the front case 25 and the housing 14, and the cap 67 is fixed to the front case 25. Therefore, the cap 67 is not dropped from the front case 25 in a state where the plug 70 is removed from the attachment hole 41, and is not lost.

  The housing 14 may be divided into two parts, that is, a first component piece and a second component piece along the straight line A3. And it is good also as a structure which provides the locking groove 72 in each of a 1st component piece and a 2nd component piece, and pinches | interposes the base 71 with a 1st component piece and a 2nd component piece. In this way, even when the housing 14 is divided into two parts, the cap 67 can be prevented from being lost.

  Further, as shown in FIG. 10A, in a state where the plug 70 is inserted into the attachment hole 41, the cap 67 is disposed between the upper end of the fixed portion 40 and the axis A1 in the direction of the straight line A3. That is, the cap 67 does not protrude from the upper end of the fixed portion 40. For this reason, it can suppress that the cap 67 contacts a surrounding object in a work place, or is caught or rubbed, and the cap 67 can be prevented from being turned over or dropped.

  Two gripping portions 68 are provided, and each gripping portion 68 is provided with a plug 70. In FIG. 10, only one gripping portion 68 and plug 70 are shown for convenience. Further, the structure for fixing the cap 67 includes a structure for fixing the cap 67 by an adhesive or pressure bonding, in addition to a structure for sandwiching the cap 67 between the front case 25 and the housing 14.

  Next, the center of gravity of the work machine 10 will be described. In FIG. 3, the center of gravity W <b> 1 is in the arrangement area of the trigger switch 77 in a side view of the work machine 10. That is, the center of gravity W1 is located between the housing 14 and the mounting portion 16 in the direction of the straight line A3. The center of gravity W1 is the center of gravity when the battery pack 17 is attached to the mounting portion 16. Furthermore, the position of the center of gravity of the mount member 39 alone is shown in FIG. The center of gravity W <b> 2 of the mount member 39 alone is located between the axis A <b> 1 and the center line A <b> 2 of the first support hole 52 and the second support hole 53. In other words, the center line A2 is located between the protrusion 59 and the center of gravity W2, and the center of gravity W2 is located below the center line A2.

  For this reason, when the gripping tool 36 to which the mount member 39 is attached is attached to the front case 25, the protrusion 59 is positioned above the center line A2. In other words, just by inserting the joint 37 into the first support hole 52 and the second support hole 53 and attaching the joint 37 to the mount member 39, the mounting state of the mount member 39 with respect to the joint 37 is as shown in FIG. Thus, the protrusion 59 is automatically positioned above the center line A2 by its own weight. Therefore, the work of fixing the gripping tool 36 to the front case 25 can be easily performed.

  FIG. 12 shows an example in which the gripping tool 36 is fixed to the front case 25. The internal thread 42 is not provided on the inner surface of the mounting hole 41. In a state where the first shaft portion 46 of the joint 37 is inserted into the mounting hole 41, the male screw 49 provided on the first shaft portion 46 is disposed outside the mounting hole 41. In addition to the mount member 39, a mount member 79 is provided. The mount member 79 has a support hole 80, and the first shaft portion 46 is disposed in the support hole 80. The mount member 79 is integrally formed of synthetic resin. In the first shaft portion 46, the portion where the male screw 49 is formed is disposed outside the support hole 80.

  A nut 81 is attached to the male screw 49, and the nut 81 is tightened so that the gripping tool 36 is fixed to the front case 25. The fixed portion 40 is sandwiched between the mount member 39 and the mount member 79 in the direction of the center line A2. That is, the second shaft portion 47 and the nut 81 apply a compressive load in the direction of the center line A2 to the mount members 39 and 79 and the fixed portion 40. The mount member 79 has a contact surface 82, and the contact surface 82 and the contact surface 45 are in contact with each other. That is, the contact surface 82 is pressed against the contact surface 45 in a state where the nut 81 is tightened. The contact surface 82 is inclined similarly to the contact surface 58.

  FIG. 13 shows an example in which the gripping tool 36 is attached to the front case 25. In the joint 37 shown in FIG. 13, the male screw 49 is not provided on the first shaft portion 46. An annular groove 83 is provided on the outer peripheral surface of the first shaft portion 46, and the groove 83 is formed in the first shaft portion 46 in a state where the first shaft portion 46 is inserted into the mounting hole 41. Is located outside the mounting hole 41.

  A mount member 84 attached to the first shaft portion 46 is provided. The mount member 84 has a C shape in a plan view that intersects the center line A2. That is, the mount member 84 has the notch 86. Further, a protrusion 85 is provided on the inner peripheral surface of the mount member 84. The protrusion 85 protrudes inward in the radial direction from the inner peripheral surface of the mount member 84. The mount member 84 is disposed outside the attachment hole 41. The mount member 84 has a contact surface 87. The contact surface 87 is configured in the same manner as the contact surface 58.

  The mount member 84 is integrally formed of synthetic resin. When the mount member 84 is pressed against the first shaft portion 46, the notch 86 is enlarged and the mount member 84 is attached to the first shaft portion 46. When the mount member 84 is attached to the first shaft portion 46, the protrusion 85 is positioned in the groove 83. That is, the joint 37 and the mount member 84 are positioned and fixed in the direction of the center line A2 by the engaging force between the protrusion 85 and the first shaft portion 46. Further, the contact surface 87 of the mount member 84 is pressed against the contact surface 45 in a state where the mount member 84 is attached to the first shaft portion 46. That is, the fixing portion 40 is sandwiched between the mount member 39 and the mount member 84, and the gripping tool 36 is fixed to the front case 25.

  Further, the width of the notch 86 is less than the outer diameter of the first shaft portion 46. Accordingly, the mount member 84 is not detached from the first shaft portion 46 unless the mount member 84 is elastically deformed. Furthermore, the mount member 84 can be attached to and detached from the first shaft portion 46 by moving the mount member 84 in the radial direction with respect to the first shaft portion 46 and elastically deforming the mount member 84. That is, the mount member 84 can be attached to and detached from the first shaft portion 46 with one operation, and the work of attaching and detaching the gripping tool 36 to the front case 25 is facilitated.

  In the attachment example of the gripping tool 36 shown in FIGS. 12 and 13, it is possible to close the mounting hole 41 with the cap 67 described in FIGS. 8 to 11 in a state where the gripping tool 36 is not attached to the front case 25. is there. 12 and 13, the mounting hole 41 penetrates through the fixing portion 40, and the effects described with reference to FIGS. 1 to 7 can be obtained because the gripping tool 36 is attached via the mount member 39. Can do.

  FIG. 14A shows an example in which the gripping tool 36 is attached to the mounting portion 16. In addition, the example which attaches the holding | gripping tool 36 to the mounting part 16 is shown by the dashed-two dotted line in FIG. As shown in FIG. 14B, the mounting portion 16 is provided with a fixing portion 88. A nut 89 is fixed to the fixing portion 88, and a female screw 91 is provided on the inner surface of the mounting hole 90 of the nut 89. The fixing portion 88 has openings 92 and 93 disposed on both sides of the attachment hole 90. The gripping tool 36 is attached to the fixing portion 88 via a mount member 94 shown in FIGS. 15 (A) and 15 (B). The mount member 94 is configured in the same manner as the mount member 39 shown in FIGS. The mounting member 94 shown in FIG. 15 does not include the contact surface 58.

  When attaching the gripping tool 36 of FIG. 14 to the mounting portion 16, the nut 89 and the gripping tool 36 are positioned concentrically as shown in FIG. 15A, and the first shaft portion 46 is attached to the mounting hole via the opening 92. Insert into 90 and rotate handle 38. Then, the male screw 49 of the first shaft portion 46 is screwed into the female screw 91 of the nut 89. Then, as shown in FIG. 15B, when the mount member 94 is sandwiched between the second shaft portion 47 and the fixing portion 88, the fastening of the joint 37 is completed, and the gripping tool 36 is fixed to the mounting portion 16. Is done.

  When the gripping tool 36 is fixed to the mounting portion 16, the center line A4 of the joint 37 is parallel to the center line A2. In FIG. 2, the center line A4 and the straight line A3 intersect at an intersection B2. When the gripping tool 36 is fixed to the mounting portion 16, the distance L1 from the axis A1 to the flange 61 is the same as the distance L1 from the axis A1 to the flange 61 when the gripping tool 36 is fixed to the front case 25. It is. The distance from the axis A1 to the intersection B2 is longer than the distance from the axis A1 to the intersection B1. That is, when the main body 11 vibrates around the axis A1, the vibration amount generated at the intersection B2 is larger than the vibration amount generated at the intersection B1. Therefore, the vibration of the main body 11 can be effectively suppressed by attaching the gripping tool 36 to the mounting portion 16. The vibration of the main body 11 can be grasped as the rotation of the main body 11, and the vibration force of the main body 11 can be grasped as the rotation amount of the main body 11.

  Further, when the gripping tool 36 is attached to the mounting portion 16, the distance L2 from the straight line A3 to the tip of the handle 38 is the distance from the straight line A3 to the tip of the handle 38 when the gripping tool 36 is attached to the front case 25. It is shorter than the distance L3. Therefore, when the gripping tool 36 is attached to the mounting portion 16, it is possible to avoid the handle 38 from contacting the object.

  FIG. 15 shows an example in which the first shaft portion 46 is inserted into the opening 92 and the gripping tool 36 is fixed to the mounting portion 16. On the other hand, the work machine 10 in FIG. 14 can also fix the gripping tool 36 to the mounting portion 16 by inserting the first shaft portion 46 shown in FIG. 15 into the opening 93. Furthermore, the working machine 10 may be provided with the mounting hole 91 in the mounting portion 16 and the mounting hole 41 in the front case 25. The gripping tool 36 is attached to either the front case 25 or the mounting portion 16. That is, the gripping tool 36 is not attached to both the mounting portion 16 and the front case 25. In addition, it is also possible to close the attachment hole 41 with the cap 67 in a state where the gripping tool 36 is not attached to the front case 25 shown in FIG. Furthermore, it is also possible to close the attachment hole 91 with a seal member in a state where the gripping tool 36 is not attached to the fixing portion 88 of FIG.

  The correspondence between the configuration described in each embodiment and the configuration of the present invention is as follows. The electric motor 12 corresponds to the motor of the present invention, the work machine 10 corresponds to the work machine of the present invention, the transmission device 27 corresponds to the transmission mechanism of the present invention, and the front case 25 corresponds to the case of the present invention. It corresponds to. The gripping tool 36 corresponds to the gripping tool of the present invention, the mounting hole 41 corresponds to the mounting hole of the present invention, and the recesses 43 and 44 and the openings 92 and 93 correspond to the first and second openings of the present invention. The joint 37 corresponds to the opening and the shaft 37 of the present invention.

  The tip 37A of the joint 37 corresponds to the “tip of the shaft” in the present invention, the intersection B1 corresponds to the “center in the center line direction” in the present invention, and the contact surface 45 corresponds to the contact surface of the present invention. The mount members 39 and 79 correspond to the intermediate member of the present invention. The first support hole 52 and the second support hole 53 correspond to the support hole of the present invention, the male screw 49 and the female screw 42 correspond to the screw mechanism of the present invention, and the retainer 56 corresponds to the retainer of the present invention. To do.

  The grip 15 corresponds to the grip of the present invention, the direction of the straight line A3 corresponds to the “direction intersecting the axis” of the present invention, and the battery pack 17 corresponds to the power supply mechanism of the present invention. The cap 67 corresponds to the seal member of the present invention, the housing 14 corresponds to the housing of the present invention, the base portion 71 corresponds to the base portion of the present invention, and the connection portion 69 corresponds to the connection portion of the present invention. The plug 70 corresponds to the plug of the present invention, the protrusion 59 corresponds to the support portion of the present invention, and the center of gravity W2 corresponds to “the center of gravity of the intermediate member” in the present invention.

  The working machine of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the working machine. For example, the working machine of the present invention includes a driver that rotates a work tool to tighten or loosen a screw member or a bolt, and a drill that cuts or drills a counterpart member with the work tool. In addition, the work machine described in the embodiment is a work machine having a first structure that applies a rotational force to the work tool. The work machine of the present invention includes a work machine having a second structure and a work machine having a third structure. The work machine having the second structure can apply a rotational force and a striking force in the rotational direction to the work tool. The work machine having the third structure can apply a rotational force and an axial striking force to the work tool.

  The transmission mechanism of the present invention is a mechanism that transmits the rotational force of the motor to the work tool, and the transmission mechanism includes a gear transmission mechanism, a winding transmission mechanism, and a friction transmission mechanism. The motor of the present invention includes an electric motor, a hydraulic motor, a pneumatic motor, and an engine. The power source that supplies power to the electric motor includes a DC power source and an AC power source. The power supply mechanism attached to and detached from the grip includes a battery pack as a DC power source and an adapter connected to the AC power source. The work machine of the present invention includes a structure in which a power cable attached to a grip is connected to a DC power source provided separately from the work machine or an AC power source. That is, the power supply mechanism of the present invention includes a power supply itself and a path for supplying power from the power supply to the electric motor.

  In the embodiment of the working machine, the connection structure between the joint and the handle includes a structure in which a male screw provided in the joint is screwed into a female screw provided in the handle. The working machine 10 described in the embodiment is an example in which the smaller angle formed between the straight line A3 and the center line A2 is 90 degrees as shown in FIG. The work machine of the present invention includes a structure in which the smaller angle formed between the straight line A3 and the center line A2 is different from 90 degrees. For example, a structure in which the straight line A3 and the center line A2 overlap in a front view of the work machine as shown in FIG. The working machine having this structure is configured to connect a power cable attached to a grip to an AC power source. Furthermore, the working machine of the present invention also includes a structure in which an angle formed between the straight line A3 and the center line A2 is 180 degrees in a front view of the working machine as shown in FIG. In the present invention, the planar view that intersects the axis that is the rotation center of the work tool includes a planar view that is perpendicular to the axis and a planar view that is not perpendicular to the axis.

  25 ... front case, 36 ... gripping tool, 41 ... mounting hole, 67 ... cap.

Claims (14)

A working machine that rotates a work tool with the power of a motor,
A main body for supporting the work tool;
A gripping tool attached to the main body and grasped by an operator;
An attachment hole provided in the main body and for attaching the gripping tool;
In a state where the gripping tool is not attached to the attachment hole, a seal member that closes the attachment hole;
Having a working machine. The body is
A housing containing the motor;
A case fixed to the housing;
Have
A transmission mechanism for transmitting the rotational force of the motor to the work tool is supported by the case,
The work machine according to claim 1, wherein the attachment hole is provided in the case.   The work machine according to claim 2, wherein the attachment hole penetrates the case in a plan view intersecting with an axis that is a rotation center of the work tool. An intermediate member interposed between the gripping tool and the case is provided,
The work machine according to claim 3, wherein the intermediate member supports the gripping tool.   The work machine according to claim 2, wherein the seal member is sandwiched between the housing and the case. The sealing member is
A base sandwiched between the housing and the case;
A connecting portion that is continuous with the base and is deformable;
A plug that is continuous with the connecting portion and is fitted into the mounting hole;
Have
The work machine according to claim 4, wherein the intermediate member includes a support portion that supports the plug. A first opening and a second opening are formed on both sides in the center line direction of the mounting hole,
The gripping tool has a shaft portion inserted into the mounting hole,
The tip end of the shaft portion inserted into the mounting hole from the first opening is located between the center in the center line direction and the second opening. The working machine described. The case has a contact surface with which the intermediate member contacts,
The work machine according to claim 4 or 6, wherein the contact surface is inclined with respect to a center line of the attachment hole.   The working machine according to claim 4 or 6, wherein the center of gravity of the intermediate member is disposed between the axis and the center line of the gripping tool in a plan view intersecting the axis. The gripping tool has a shaft portion arranged in the mounting hole,
The intermediate member has a support hole in which the shaft portion is disposed,
The working machine according to any one of claims 4, 6, and 9, wherein an inner diameter of the support hole is constant in a center line direction of the mounting hole.   The work machine according to any one of claims 2, 4, 6, 8, 9, and 10, wherein a screw mechanism for fixing the case and the gripping tool is provided.   The working machine according to claim 10, wherein a retaining member is provided to prevent the gripping tool from slipping out of the support hole. The main body has a grip protruding from the case in a direction intersecting with an axis that is a rotation center of the work tool,
The work machine according to any one of claims 2, 3, 4, 5, 6, 8, 9, 10, 11, and 12, wherein the attachment hole is provided in the grip. The motor is an electric motor that converts electric power into power,
The work machine according to claim 13, wherein the grip is detachably attachable to a power supply mechanism that supplies power to the motor.

Images