Driving tool

Abstract

The invention provides a driving tool. In a driving tool for returning a driving device for driving a driving piece to a standby position through a lifting mechanism, a clamping part clamped with the driving device when the driving device returns to the standby position needs to be fully lubricated. The purpose of the present invention is to improve durability of a lifting mechanism by sufficiently lubricating an engagement portion of the lifting mechanism. In a lifting mechanism, a holder (39) that rotates integrally with a wheel section (33) is provided with a grease reservoir section (42). Grease (G) in the grease reservoir (42) flows through the inclined surface (45a) of the wall (45), the opening hole (47), the extension groove (33f), and the through groove (33h) to the support hole (33 g). Therefore, the wheel part (33), particularly the clamping part (34E), can be lubricated by a sufficient amount of lubricating grease (G), so that the durability can be improved.

Description

Technical Field

[0001] The invention relates to a driving tool for driving a driven workpiece into a driven workpiece. Background Art

[0002] Patent documents 1 and 2 disclose a driving tool, which has a piston and a driver, wherein the piston moves in a driving direction by compressed gas; the driver engages with the piston to strike the driven object. The driver, which reaches the lower moving end in the driving direction, returns to an upper standby position by a wheel portion rotated by an electric motor. A plurality of meshing teeth are provided on the driver along the driving direction. The meshing teeth sequentially engage with the engaging portion of the rotating wheel portion and return upward from the lower moving end position. [Prior art literature] [Patent Document]

[0003] Patent Document 1: Japanese Patent Application No. 6780772 Patent Document 2: Japanese Patent Application Publication No. 2022-118835 Summary of the invention [Technical problem to be solved by the invention]

[0004] In order to ensure durability, it is necessary to properly lubricate the engaging portion of the wheel part with which the meshing teeth of the driver engage. Patent document 1 discloses the case of providing a lubricating oil impregnated body for supplying lubricating oil to the engaging portion. Patent document 2 discloses the case of providing a grease reservoir for supplying lubricating oil to the engaging portion. The purpose of the present disclosure is to further improve the durability of the engaging portion of the wheel part by supplying a more sufficient amount of lubricating oil. [Technical solutions for solving technical problems]

[0005] According to one aspect of the present disclosure, for example, a driving tool has a driver and a wheel portion, wherein the driver moves in a driving direction to strike a driven object; and the wheel portion has a plurality of engaging portions for the driver to engage. For example, the driving tool has an electric motor, and the electric motor rotates the wheel portion so as to return the driver in a direction opposite to the driving direction through the engaging portion. For example, the driving tool has a retaining member, a grease reservoir, and a grease flow path, wherein the retaining member is provided on the wheel portion; the grease reservoir is provided on the retaining member; and the grease flow path connects the grease reservoir and at least one of the plurality of engaging portions that engages with the driver in a standby position of the driver.

[0006] Therefore, a sufficient amount of grease is filled into the grease reservoir of the retainer. The grease flows from the grease reservoir to the engaging portion that engages with the driver at least in the standby position of the driver via the grease flow path. Thus, a sufficient amount of grease can be supplied to the engaging portion to improve the durability of the wheel portion.

[0007] According to another aspect of the present disclosure, for example, the driving tool has a driver and a wheel, wherein the driver moves in a driving direction to strike the driven object; and the wheel has a clamping portion for clamping the driver. For example, the driving tool has an electric motor, and the electric motor rotates the wheel so that the driver returns in a direction opposite to the driving direction through the clamping portion. For example, the driving tool has a holder, which is mounted on the wheel and is provided with a magnet for detecting the rotation position of the wheel. For example, the driving tool has a grease reservoir provided on the holder.

[0008] Therefore, a grease reservoir is provided on a retaining member provided with a magnet for detecting the rotational position. A sufficient amount of grease is filled into the grease reservoir. The grease in the grease reservoir flows to the engaging portion. Thus, a sufficient amount of grease can be supplied to the engaging portion, thereby improving the durability of the wheel portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the left side view of the driving tool. Figure 2 yes Figure 1 The II-II sectional view in FIG. 1 is a longitudinal sectional view of the tool body. This figure shows the state where the driver is in the standby position. Figure 3 This is a right side view of the driving tool. This figure shows the state in which the right side split housing is removed to expose the inside. Figure 4 It is the right view of the lifting mechanism. Figure 5 It is a three-dimensional diagram of the lifting mechanism. Figure 6 It is a three-dimensional exploded view of the lifting mechanism. Figure 7 This figure is a perspective view of the holder as viewed from the front surface side. Figure 8 This figure is a perspective view of the wheel portion. This figure is a perspective view viewed from the rear surface side. Fig. 9 yes Figure 8 IX view in the figure. Fig.10 This is a longitudinal sectional view of the first grease flow path. Fig.11 It is a longitudinal sectional view of the second grease flow path. [Explanation of Reference Numerals] W: driven part; t: driven part; 1: driving tool; 2: driving tool; 2a: engaging part; 3: grip; 4: switch operating lever; 4a: switch body; 5: battery installation part; 6: battery; 7: fixing screw; 8: controller; 10: tool body; 11: body shell; 11L: left split shell; 11R: right split shell; 12: cylinder; 13: piston; 14: pressure storage chamber; 15: machine head; 16: driving tool guide; 1 6a: front guide; 16b: rear guide; 16c: driving passage; 17: contact arm; 17a: dial; 17b: compression spring; 18: ejection port; 19: lower moving end damper; 20: nail magazine; 21: nail magazine body; 23: pusher; G: grease; G1: first grease flow path; G2: second grease flow path; 30: lifting mechanism; 31: electric motor; 32: reduction gear set; 32a: output shaft; 32b: plane 32c: front part; 32d: rear part; 33: wheel part; 33a: retreat area; 33b: front flange; 33c: rear flange; 33d: connecting part; 33e: support hole; 33f: extension groove; 33g: support hole; 33h: through groove; 33i: recess; 33j: connecting hole; 34: engaging part; 34F: initial engaging part; 34E: final engaging part; 35: mechanism housing; 36: bearing; 37: front supporting plate; 38 : Cover body; 38a: Support hole; 38b: Small diameter hole; 38c: Large diameter hole; 39: Retaining member; 39a: Abutment plate; 39b: Retaining ring; 39c: Support hole; 39d: Positioning protrusion; R: Rotation direction of wheel portion 33; 40: Magnet; 41: Sensor; 42, 43, 44: Grease reservoir; 45: Wall; 45a: Inclined surface; 46: Wall; 46a, 46b: Inclined surfaces; 47: Opening hole; 48: Recessed connecting hole. DETAILED DESCRIPTION

[0010] In one or more embodiments, for example, the wheel portion has a support hole for the engaging portion to penetrate. For example, the grease flow path has a first grease flow path, and the first grease flow path includes an extension groove formed on the outer surface of the wheel portion facing the retainer and extending from the support hole. Therefore, the grease of the grease reservoir is supplied to the support hole of the engaging portion via the extension groove.

[0011] In one or more embodiments, for example, the extension groove is in a long arc shape centered on the rotation center of the wheel portion. For example, the first grease flow path further includes a through groove, which penetrates the wheel portion along the inner circumferential surface of the support hole from the extension groove. Therefore, the grease can be more reliably supplied to the support hole via the through groove.

[0012] In one or more embodiments, for example, the wheel portion has a support hole for the engaging portion to penetrate. For example, the grease flow path has a second grease flow path, and the second grease flow path includes a recessed portion and a connecting hole, wherein the recessed portion is formed on the outer surface of the wheel portion facing the retainer; and the connecting hole is connected to the recessed portion and opens to the engaging portion. Therefore, the grease in the grease reservoir is supplied to the support hole via the recessed portion and the connecting hole serving as the second grease flow path.

[0013] In one or more embodiments, for example, the grease reservoir has an inclined surface at an end portion in the circumferential direction, the inclined surface being inclined relative to the depth direction of the grease reservoir and facing the grease flow path. Therefore, the grease in the grease reservoir flows smoothly to the grease flow path via the inclined surface.

[0014] In one or more embodiments, for example, a magnet for detecting the rotational position is provided on the holder, so that the rotational position of the holder can be detected by the magnet.

[0015] In one or more embodiments, for example, a cover body for closing the grease reservoir is provided between the wheel portion and the retainer, and a hole constituting a part of the grease flow path is provided in the cover body. Therefore, the grease in the grease reservoir is supplied to the engaging portion of the wheel portion through the hole in the cover body.

[0016] In one or more embodiments, for example, the cover body is provided with an opening hole opening into the extension groove of the wheel portion as part of the first grease flow path. Therefore, the grease in the grease reservoir flows to the extension groove via the opening hole forming part of the first grease flow path.

[0017] In one or more embodiments, for example, a recessed communicating hole opening in the recessed portion of the wheel portion is formed in the cover as part of the second grease flow path. Therefore, the grease in the grease reservoir flows to the recessed portion via the recessed communicating hole constituting part of the second grease flow path.

[0018] In one or more embodiments, for example, an opening hole opened in the extension groove of the wheel portion is formed in the cover body as a part of the first grease flow path, and a recessed portion communicating hole opened in the recessed portion of the wheel portion is formed as a part of the second grease flow path. Therefore, the grease in the grease reservoir flows to the extension groove via the opening hole constituting a part of the first grease flow path, and flows to the recessed portion via the recessed portion communicating hole constituting a part of the second grease flow path. [Example]

[0019] In the embodiment of the present invention, as an example of the driving tool 1, a gas spring type driving tool is illustrated which uses the air pressure of the pressure accumulator chamber above the air cylinder as the thrust for driving the driving member t. The driving member t is, for example, a rod-shaped nail. In the following description, the driving direction of the driving member t is defined as the downward direction, and the direction opposite to the driving direction is defined as the upward direction. The user of the driving tool 1 is located at Figure 1 The right side of the driving tool 1 (handle 3 side) is inserted in the middle. The side near the user is set as the rear direction (user side), and the side opposite to the near side is set as the front direction. The left and right directions are based on the user holding the handle 3.

[0020] like Figures 1 to 3 As shown, the driving tool 1 has a tool body 10. The tool body 10 has a main body shell 11 made of resin. The main body shell 11 has a left-right split structure in which left-right split shells 11L and 11R are facing each other and screwed together. A cylinder 12 is accommodated in the main body shell 11. A piston 13 is accommodated in the cylinder 12 in a manner that it can reciprocate up and down. A long driving tool 2 is connected to the center of the lower surface of the piston 13. The lower side of the driving tool 2 enters the driving passage 16c described later. The upper part of the cylinder 12 above the piston 13 is connected to the pressure storage chamber 14. Compressed gas such as air is sealed in the pressure storage chamber 14. The air pressure of the pressure storage chamber 14 acts as a thrust to move the upper surface of the piston 13 downward.

[0021] A machine head 15 is provided at the lower part of the tool body 10. The machine head 15 has a driver guide 16 and a contact arm 17. The driver guide 16 has a front guide 16a at the front side and a rear guide 16b at the rear side. The front guide 16a and the rear guide 16b are joined to each other to form the driver guide 16. A driver passage 16c is formed between the front guide 16a and the rear guide 16b. The driver passage 16c is connected to the inner peripheral side of the cylinder 12. The driver 2 enters the driver passage 16c in a manner that it can reciprocate up and down.

[0022] The contact arm 17 is supported around the driver guide 16 in a manner that allows for vertical displacement. The contact arm 17 extends upward from around the lower end (injection port 18) of the driver guide 16. Figure 2 As shown in FIG. 1 , the contact arm 17 is urged toward the lower disconnected position by the compression spring 17 b. In the disconnected position, the lower end of the contact arm 17 is located below the ejection port 18.

[0023] The triggering operation of the switch operating lever 4 is made effective by pressing the contact arm 17 against the driven part W and moving it upward relatively (closing operation). A dial 17a for adjusting the driving depth is provided below the compression spring 17b. By rotating the dial 17a, the disconnected position of the contact arm 17 can be displaced up and down. In this way, the stroke of the contact arm 17 is changed, thereby changing the position of the ejection port 18 relative to the driven part W during the closing operation. In this way, the driving depth of the driven part t relative to the driven part W is switched.

[0024] like Figure 1 As shown, a magazine 20 is connected to the rear surface side of the machine head 15. A plurality of driven pieces t are loaded in the magazine 20. The magazine 20 has a magazine body 21 for accommodating the plurality of driven pieces t, and a pusher 23 for pushing the accommodated driven pieces t toward the driving passage 16c of the machine head 15. One driven piece t pushed by the pusher 23 and supplied from the magazine body 21 to the driving passage 16c is struck by the downwardly moving driving device 2 and ejected from the ejection port 18.

[0025] A grip 3 for the user to hold is provided on the rear surface side of the tool body 10. The grip 3 has a split structure in which left and right grip shells 3L and 3R integrally provided on the main body shell 11 face each other and are screwed together. A start switch operating lever 4 for the user to press with his fingertips is provided on the front lower surface of the grip 3. Figure 3 As shown, a switch main body 4a is installed above the switch operating rod 4. When the switch operating rod 4 is pulled upward, the switch main body 4a is turned on. When the switch main body 4a is turned on, power is supplied to the lifting mechanism 30 described later.

[0026] like Figure 3 As shown, a battery mounting portion 5 is provided at the rear of the handle 3. A battery 6 is mounted on the battery mounting portion 5. The battery 6 is mounted on the battery mounting portion 5 by sliding downward. The mounted battery 6 can be removed from the battery mounting portion 5 by sliding upward. The battery 6 can be repeatedly used by being removed from the battery mounting portion 5 and charged by a separately prepared charger. The battery 6 has the versatility to be used as a power source for other electric tools. The electric motor 31 of the lifting mechanism 30 is operated with the power of the battery 6 as a power source.

[0027] A rectangular flat controller 8 is installed in the battery mounting portion 5. The controller 8 is arranged to extend vertically along the front surface side of the mounted battery 6. By turning on the switch operating lever 4 and the contact arm 17, the lifting mechanism 30 is operated and the driving operation is started. The operation of the electric motor 31 of the lifting mechanism 30 is mainly controlled by the controller 8.

[0028] like Figure 2As shown, a lower moving end damper 19 for absorbing the impact at the lower moving end of the piston 13 is arranged at the lower part of the cylinder 12. The lower side of the driver 2 enters the driving passage 16c through the inner peripheral side of the lower moving end damper 19. The driver 2 moves downward in the driving passage 16c due to the air pressure of the pressure accumulation chamber 14 acting on the upper surface of the piston 13. The top end (lower end) of the driver 2 moving downward in the driving passage 16c strikes a driving member t supplied to the driving passage 16c. The driving member t struck by the piston 13 reaches the lower moving end and is ejected from the ejection port 18. The ejected driving member t is driven into the driven member W.

[0029] A lifting mechanism 30 is provided below the handle 3. The lifting mechanism 30 has an electric motor 31 as a driving source. A wheel portion 33 is supported in front of the electric motor 31 via a reduction gear group 32. The wheel portion 33 is covered by a mechanism housing 35. The driver 2 and the piston 13 that have reached the lower moving end are returned to the upper standby position (in the opposite direction to the driving direction of the driven part t) through the lifting mechanism 30. The wheel portion 33 is supported by the output shaft 32a of the reduction gear group 32. The wheel portion 33 moves to the upper side. Figure 2 The direction shown in the middle arrow R (counterclockwise in the figure) rotates. Accordingly, the driver 2 returns upward (in the opposite direction of the driving direction).

[0030] For example, nine engaging portions 2a are provided on the right side of the driver 2. Each engaging portion 2a has a rack tooth shape protruding to the right. The plurality of engaging portions 2a are arranged at regular intervals in the longitudinal direction (vertical direction) of the driver 2. The wheel portion 33 of the lifting mechanism 30 is sequentially engaged with the plurality of engaging portions 2a.

[0031] The wheel portion 33 is arranged on the right side of the driver 2. The wheel portion 33 has, for example, nine engaging portions 34 that are sequentially engaged with the engaging portion 2a of the driver 2. Each engaging portion 34 uses a cylindrical shaft member. The nine engaging portions 34 are arranged at a certain interval along the outer periphery of the wheel portion 33. The engaging portion 34 that first engages with the engaging portion 2a of the driver 2 that reaches the lower moving end through the rotation action of the wheel portion 33 in the direction of the arrow R is marked with the reference numeral 34F, and the engaging portion 34 that is engaged last is marked with the reference numeral 34E, and they are distinguished according to needs. The last engaging portion 34E engages with the engaging portion 2a of the driver 2 when the driver 2 is in the standby position. In the stage where the driver 2 moves upward from the standby position to the upper moving end position and then releases the engagement of the driver 2, a large load is applied to the last engaging engaging portion 34E. Therefore, it is particularly necessary to fully lubricate the last engaging portion 34E.

[0032] By starting the electric motor 31, the wheel portion 33 rotates in the direction of the arrow R. After the driver 2 reaches the lower moving end through the driving action, the engaging portion 34 is engaged with the engaging portion 2a of the driver 2 from below in sequence by the rotation of the wheel portion 33 in the direction of the arrow R, so that the driver 2 returns upward. The piston 13 is returned upward by the lifting mechanism 30, thereby increasing the air pressure in the pressure storage chamber 14. When the driver 2 returns to the lower moving end, the piston 13 is moved upward. Figure 2 When the electric motor 31 reaches the standby position shown (a position where the last engagement portion 34E is engaged with the engagement portion 2a of the driver 2), the electric motor 31 stops, and a series of driving operations are completed.

[0033] When the switch operating lever 4 is pulled again, the lifting mechanism 30 is activated again. Accordingly, the wheel portion 33 starts to rotate in the direction of arrow R, thereby the driver 2 and the piston 13 are further raised upward from the standby position. Accordingly, the last engaging portion 34E is disengaged from the engaging portion 2a of the driver 2.

[0034] A large gap in the rotation direction is provided between the first engaging portion 34F and the last engaging portion 34E in the rotation direction of the wheel portion 33 as shown by the arrow R in the figure (the retreat area 33a of the engaging portion 34 does not exist). When the retreat area 33a faces the driver 2 side by the rotation of the wheel portion 33 in the direction of the arrow R, the engagement state of the wheel portion 33 with respect to all the engaging portions 2a of the driver 2 is released. Accordingly, the piston 13 and the driver 2 move downward by the air pressure of the pressure accumulator chamber 14 acting on the piston 13. As the driver 2 moves downward in the driving passage 16c, the driving member t is struck and driven into the driven member W.

[0035] like Figures 4 to 6 As shown, the electric motor 31, the reduction gear set 32 ​​and the wheel portion 33 are arranged on the same axis with the motor axis J as the center. A cooling fan 31a is supported on the output shaft of the electric motor 31. The reduction gear set 32 ​​has a planetary gear set connected in three stages. The wheel portion 33 is supported on the output shaft 32a of the third stage planetary gear set.

[0036] The wheel portion 33 has a front flange 33b on the front side and a rear flange 33c on the rear side. The front flange 33b and the rear flange 33c are integrally joined and parallel to each other via a cylindrical connecting portion 33d. The periphery of the front flange 33b and the periphery of the rear flange 33c extend radially from the connecting portion 33d. Each of the nine engaging portions 34 is supported at both ends by spanning between the periphery of the front flange 33b and the periphery of the rear flange 33c. The end of each engaging portion 34 is inserted into a supporting hole 33g provided in the front flange 33b and the rear flange 33c and supported at both ends.

[0037] The nine engaging portions 34 are arranged at approximately constant intervals around the axis J. The interval (withdrawal area 33a) between the first engaging portion 34F and the last engaging portion 34E in the circumferential direction becomes larger. An oblong support hole 33e is provided at the center of the connecting portion 33d. The output shaft 32a is inserted into the support hole 33e. The flat portion 32b of the output shaft 32a is inserted into the support hole 33e. Accordingly, the wheel portion 33 is supported to rotate integrally with the output shaft 32a around the motor axis J, and can be displaced within a certain range in a radial direction orthogonal to the motor axis J relative to the output shaft 32a.

[0038] The front portion 32c of the output shaft 32a is rotatably supported by a front support plate 37 via a bearing 36. The front support plate 37 is threadedly engaged with the front portion of the mechanism case 35. The front portion of the mechanism case 35 is closed by the front support plate 37.

[0039] A cover body 38 is supported on the rear surface side of the wheel portion 33. A retaining member 39 is supported on the rear surface side of the cover body 38. The cover body 38 and the retaining member 39 each have a disc shape. The retaining member 39 abuts against the rear surface of the wheel portion 33 in a manner that the cover body 38 is sandwiched between the wheel portion 33 and the retaining member 39. The circular abutment plate 39a abuts against the rear surface of the retaining member 39. The rear portion 32d of the output shaft 32a protrudes from the abutment plate 39a. A retaining ring 39b is installed on the rear portion 32d. Accordingly, the wheel portion 33, the cover body 38 and the retaining member 39 are supported in a manner that they cannot be displaced in the axial direction relative to the output shaft 32a. The flat portion 32b of the output shaft 32a is inserted into the support hole 33e of the wheel portion 33, the support hole 38a of the cover body 38 and the support hole 39c of the retaining member 39. According to this, the wheel portion 33, the cover body 38, and the holder 39 rotate integrally with the output shaft 32a.

[0040] like Figure 7 As shown, a plurality of recesses are provided on the front surface of the retainer 39. For example, three of the plurality of recesses are provided as grease reservoirs 42, 43, and 44. A sufficient amount of grease (lubricating oil) G is stored in the grease reservoirs 42, 43, and 44. The rear side of the grease reservoir 42 on the outer peripheral side in the rotation direction R is divided from the adjacent recesses by a wall 45. The position of the wall 45 in the rotation direction R of the wheel portion 33 is set to a position behind the last engaging portion 34E. The relative position of the wall 45 and the last engaging portion 34E does not change.

[0041] The grease reservoirs 42, 43, 44 and other recesses are closed by the cover 38. The cover 38 is provided with four small-diameter holes 38b and two large-diameter holes 38c in a point-symmetrical relationship. Figure 7The small diameter hole 38b on the rotation direction R side of the two small diameter holes 38b (in the near front side) becomes an opening hole 47 constituting a part of the grease flow path. The remaining three small diameter holes 38b are provided as dummy holes for eliminating the assembly directionality of the cover body 38.

[0042] The large diameter hole 38c on the side matching the wall portion 46 of the two large diameter holes 38c serves as a concave communicating hole 48 constituting a part of the grease flow path. A cylindrical positioning protrusion 39d provided on the front surface of the retainer 39 is inserted into the large diameter hole 38c on the opposite side. Thus, the cover 38 is positioned relative to the retainer 39 in the rotation direction R. By providing the two large diameter holes 38c in a point-symmetrical positional relationship, the assembly directionality of the cover 38 can be eliminated.

[0043] like Fig.10 As shown, the front surface of the wall portion 45 in the rotation direction R is formed as an inclined surface 45a. The inclined surface 45a is inclined with respect to the depth direction of the grease reservoir 42 and is inclined toward the downstream side of the grease flow path (the opening hole 47 side of the cover body 38).

[0044] like Figures 8 to 10 As shown in FIG. 1 , an arc-shaped extension groove 33f is provided on the rear surface of the rear flange 33c of the wheel portion 33. The extension groove 33f extends from the support hole 33g of the engaging portion 34E along the rear surface of the rear flange 33c. A through groove 33h is provided along the inner circumference of the support hole 33g from the extension groove 33f. The through groove 33h penetrates the rear flange 33c. The extension groove 33f and the through groove 33h also constitute a part of the grease flow path.

[0045] The grease G flows from the grease reservoir 42 into the opening hole 47 via the inclined surface 45a. The grease G flowing into the opening hole 47 flows into the support hole 33g through the extension groove 33f and the through groove 33h. In this way, the engaging portion 34E is lubricated. The grease reservoir 42, the inclined surface 45a of the wall portion 45, the opening hole 47, the extension groove 33f, the through groove 33h, and the support hole 33g constitute a first grease flow path G1 for lubricating the engaging portion 34E.

[0046] like Figure 7 As shown, the two grease reservoirs 43 and 44 on the inner circumference are divided from each other by a wall 46. Fig.11 As shown, both surfaces of the wall portion 46 in the rotation direction R are formed as inclined surfaces 46a, 46b. The inclined surfaces 46a, 46b are inclined relative to the depth direction of the grease reservoirs 43, 44 and are inclined toward the downstream side of the grease flow path (the recessed communication hole 48 side of the cover body 38).

[0047] like Figure 8 , 9As shown in Figures 11 and 12, an oblong recess 33i is provided on the rear surface of the rear flange 33c of the wheel portion 33. The recess 33i is formed with a depth reaching the front portion of the connecting portion 33d. The depth of the recess 33i does not reach the front flange 33b. A connecting hole 33j is provided in the middle of the depth direction of the recess 33i. The connecting hole 33j is a circular hole, which is provided to penetrate the wall thickness direction of the connecting portion 33d (radial direction of the wheel portion 33). The connecting hole 33j opens on the inner peripheral side of the last engaging portion 34E.

[0048] The grease G flows from the grease reservoirs 43 and 44 into the recessed communicating hole 48 via the inclined surfaces 46a and 46b. The grease G flowing into the recessed communicating hole 48 flows out to the support hole 33g and the last engaging portion 34E via the recess 33i and the communicating hole 33j. Thus, the engaging portion 34E is lubricated. The grease reservoirs 43 and 44, the inclined surfaces 46a and 46b of the wall 46, the recessed communicating hole 48, the recess 33i and the communicating hole 33j constitute a second grease flow path G2 for lubricating the engaging portion 34E.

[0049] Two magnets 40 are mounted on the lower surface of the holder 39. The two magnets 40 are arranged along the periphery. Figure 3 As shown in FIG. 1 , a sensor 41 is mounted on the outer surface of the mechanism case 35 . The magnet 40 is detected by the sensor 41 . Based on this, the rotation position of the wheel portion 33 is detected. The detection signal of the sensor 41 is input to the controller 8 .

[0050] According to the embodiment, the holder 39 provided with the magnet 40 for detecting the rotational position is provided with grease reservoirs 42, 43, 44. The grease reservoirs 42, 43, 44 are filled with a sufficient amount of grease G. The grease G flows mainly from the grease reservoirs 42, 43, 44 to the engaging portion 34E via the first grease flow path G1 and the second grease flow path G2. Thus, a sufficient amount of grease G is supplied to the engaging portion 34E and its periphery, thereby improving the durability of the wheel portion 33.

[0051] According to the embodiment, the wheel portion 33 has a support hole 33g through which the engaging portion 34 is inserted. The first grease flow path G1 includes an extension groove 33f formed on the rear surface of the wheel portion 33 facing the retainer 39 and extending from the support hole 33g. Therefore, the grease G in the grease reservoir 42 is supplied to the support hole 33g of the engaging portion 34E and the engaging portion 34E via the extension groove 33f.

[0052] According to the embodiment, the extension groove 33f is in a long arc shape centered on the rotation center (motor axis J) of the wheel portion 33. The first grease flow path G1 further includes a through groove 33h that penetrates the wheel portion 33 from the extension groove 33f along the inner circumferential surface of the support hole 33g. Therefore, the grease G can be more reliably supplied to the support hole 33g and the engaging portion 34E via the through groove 33h.

[0053] According to the embodiment, the second grease flow path G2 includes a recessed portion 33i and a connecting hole 33j, wherein the recessed portion 33i is formed on the rear surface of the wheel portion 33 facing the retainer 39, and the connecting hole 33j is connected to the recessed portion 33i and opens to the engaging portion 34E. Therefore, the grease G in the grease reservoirs 43 and 44 is supplied to the support hole 33g and the engaging portion 34E via the recessed portion 33i and the connecting hole 33j serving as the second grease flow path G2.

[0054] According to the embodiment, the grease reservoirs 42, 43, 44 have inclined surfaces 45a, 46a, 46b at the ends in the circumferential direction thereof, and the inclined surfaces 45a, 46a, 46b are inclined with respect to the depth direction of the grease reservoirs 42, 43, 44 and face the first grease flow path G1 and the second grease flow path G2. Therefore, the grease G in the grease reservoirs 42, 43, 44 flows smoothly into the first grease flow path G1 and the second grease flow path G2 via the inclined surfaces 45a, 46a, 46b.

[0055] According to the embodiment, the magnet 40 for detecting the rotational position is provided on the holder 39 that rotates integrally with the wheel 33. Therefore, the rotational position of the wheel 33 can be detected by the magnet 40. The operation of the electric motor 31 can be controlled based on the detected rotational position of the wheel 33.

[0056] According to the embodiment, the cover 38 for closing the grease reservoirs 42, 43, 44 is provided between the wheel portion 33 and the holder 39. Therefore, the cover 38 can prevent the grease G from leaking from the grease reservoirs 42, 43, 44.

[0057] According to the embodiment, the cover 38 has an opening hole 47 opened in the extension groove 33f of the wheel portion 33 as the first grease flow path G1. Therefore, the grease G in the grease reservoir 42 flows to the extension groove 33f through the opening hole 47 constituting a part of the first grease flow path G1.

[0058] According to the embodiment, the cover 38 is provided with a recessed communicating hole 48 opening into the recessed portion 33i of the wheel portion 33 as the second grease flow path G2. Therefore, the grease G in the grease reservoirs 43 and 44 flows to the recessed portion 33i via the recessed communicating hole 48 constituting a part of the second grease flow path G2.

[0059] The above-described embodiment can be modified. For example, although the configuration having two systems of grease flow passages G1 and G2 is exemplified, any one system of the grease flow passages may be omitted.

[0060] The first grease flow path G1 and the second grease flow path G2 are illustrated as the paths through which the grease G flows to the last engaging portion 34E, but for example, the grease may be supplied from the grease reservoir of the retainer 39 to other engaging portions 34 by adding more flow paths.

[0061] Although the gas spring type driving tool 1 is exemplified, the exemplified lubrication structure can also be applied to a lifting mechanism in a mechanical spring type driving tool that uses the urging force of a compression spring as a thrust for driving.

[0062] The driving tool 1 of the embodiment is an example of the driving tool of one aspect of the present disclosure. The driving member t of the embodiment is an example of the driving member of one aspect of the present disclosure. The driving device 2 of the embodiment is an example of the driving device of one aspect of the present disclosure. The engaging portion 34 of the embodiment is an example of the engaging portion of one aspect of the present disclosure. The wheel portion 33 of the embodiment is an example of the wheel portion of one aspect of the present disclosure.

[0063] The electric motor 31 of the embodiment is an example of an electric motor in one aspect of the present disclosure. The retaining member 39 of the embodiment is an example of a retaining member in one aspect of the present disclosure. The magnet 40 of the embodiment is an example of a magnet in another aspect of the present disclosure. The grease reservoirs 42, 43, 44 of the embodiment are examples of grease reservoirs in one aspect of the present disclosure. The first grease flow path G1 and the second grease flow path G2 of the embodiment are examples of grease flow paths in one aspect of the present disclosure.

Claims

1. A driving tool, characterized in that: The invention comprises a driver, a wheel, an electric motor, a retainer, a grease reservoir and a grease flow path, wherein: The driver moves in the driving direction to strike the driven part; The wheel portion has a plurality of engaging portions for the driver to engage with; The electric motor rotates the wheel portion so as to return the driver in a direction opposite to the driving direction through the engaging portion; The retaining member is arranged on the wheel portion; The grease reservoir is disposed on the retaining member; The grease flow path connects the grease reservoir and at least one of the plurality of engagement portions that engages with the driver at a standby position of the driver.

2. The driving tool according to claim 1, characterized in that The wheel portion has a support hole for the engaging portion to penetrate. The grease flow path has a first grease flow path including an extension groove formed on an outer surface of the wheel portion facing the retainer and extending from the support hole.

3. The driving tool according to claim 2, characterized in that The extension groove is in the shape of a long circular arc centered at the rotation center of the wheel portion. The first grease flow path further includes a through groove extending from the extension groove and penetrating the wheel portion along an inner peripheral surface of the support hole.

4. The driving tool according to any one of claims 1 to 3, characterized in that: The wheel portion has a support hole for the engaging portion to penetrate. The grease flow path has a second grease flow path, and the second grease flow path includes a recessed portion and a connecting hole, wherein the recessed portion is formed on the outer surface of the wheel portion facing the retaining member; the connecting hole is connected to the recessed portion and opens to the engaging portion.

5. The driving tool according to any one of claims 1 to 4, characterized in that: The grease reservoir has an inclined surface at an end portion in the circumferential direction thereof, the inclined surface being inclined with respect to a depth direction of the grease reservoir and facing the grease flow path.

6. The driving tool according to any one of claims 1 to 5, characterized in that: The holder is provided with a magnet for detecting a rotational position.

7. The driving tool according to any one of claims 1 to 6, characterized in that: A cover body is provided between the wheel portion and the retaining member to seal the grease reservoir. The cover body is provided with a hole constituting a part of the grease flow path.

8. Driving tool according to claim 7 as appended to claim 2 or 3, characterized in that The cover body is provided with an opening hole opened in the extension groove of the wheel portion as a part of the first grease flow path.

9. The driving tool according to claim 7 as appended to claim 4, characterized in that The cover body is provided with a recessed portion communicating hole opened in the recessed portion of the wheel portion as a part of the second grease flow path.

10. Driving tool according to claim 7 as a function of claim 4 as a function of claim 2 or 3, characterized in that The cover body has an opening hole opened in the extension groove of the wheel portion as a part of the first grease flow path, and a recessed portion communicating hole opened in the recessed portion of the wheel portion as a part of the second grease flow path.

11. A driving tool, characterized in that: The invention comprises a driver, a wheel, an electric motor, a retainer and a grease reservoir, wherein: The driver moves in the driving direction to strike the driven part; The wheel portion has an engaging portion for engaging the driver; The electric motor rotates the wheel portion so as to return the driver in a direction opposite to the driving direction through the engaging portion; The retaining member is mounted on the wheel portion and is provided with a magnet for detecting the rotational position of the wheel portion; The grease reservoir is provided on the retainer.

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