Electric work machine

Abstract

To provide an electric work machine which rationally makes sink marks less likely to occur on an outer surface of a housing.SOLUTION: An electric work machine has a motor 3a. The motor 3a is housed in a housing 1. A rib 9 protrudes from an inner peripheral surface of the housing 1. The rib 9 supports the motor 3a. A left insert member 6a is integrally joined to the housing 1. The left insert member 6a has a color different from that of an outer surface of the housing 1 and is exposed from the outer surface of the housing 1. A sink mark inhibition part 6d is provided at the left insert member 6a. The sink mark inhibition part 6d is disposed around the rib 9 to inhibit sink marks of the housing 1 caused by the rib 9.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an electric power tool, and for example to an electric power tool having a logo or the like integrally joined to a housing. [Background technology]

[0002] Electric power tools such as handheld saws have a motor as a power source and a housing that houses the motor. A logo or other markings are typically integrally bonded to the outer surface of the housing. The inner surface of the housing has multiple ribs that support the motor. The ribs are formed during the injection molding of the housing. However, the ribs can cause localized shrinkage differences, resulting in sink marks on the outer surface of the housing. These sink marks can potentially detract from the design.

[0003] Many structures for preventing sink marks have been disclosed in the past. For example, the resin molded product in Patent Document 1 integrates a lens body 40 (housing) and a seal portion 50 (rib) by two-color molding. The lens body 40 is formed so that the portion where it joins with the seal portion 50 is partially thickened. This increases the strength of the lens body 40 and suppresses the occurrence of sink marks.

[0004] The sensor of Patent Document 2 has a cylindrical wall 34 with a groove 35. The cylindrical wall 34 is formed with a small thickness to make the overall thickness nearly uniform. This allows the cylindrical wall 34 to solidify quickly and reduces the difference in shrinkage between the groove 35 and its surrounding area, thereby suppressing the occurrence of sink marks. Other commonly known configurations include making the thickness of a rib thinner than the thickness of the housing to suppress sink marks.

[0005] However, there has been a demand for thinner housings for electric power tools, for example, to reduce weight. Meanwhile, ribs are relatively thick to ensure sufficient strength to reliably support motors and other components. Furthermore, the ribs must have a certain protruding length to adequately support the motors and other components. This makes it difficult to achieve a uniform thickness throughout the housing. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6090177 [Patent Document 2] Patent No. 6344043 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, there has been a need for an electric power tool that is reasonably resistant to sink marks on the outer surface of the housing. [Means for solving the problem]

[0008] According to one aspect of the present disclosure, an electric work machine has a motor and a rotating member rotated by the motor. The motor or the rotating member is housed in a housing. Ribs protrude from an inner peripheral surface of the housing. The ribs support the motor or the rotating member. An insert member is integrally joined to the housing. The insert member is a different color from the outer surface of the housing and is exposed from the outer surface of the housing. A sink mark suppression portion is provided on the insert member. The sink mark suppression portion is arranged around the rib to suppress sink marks on the housing caused by the rib. Therefore, the sink mark suppression portion is integrally joined to the housing together with the insert member. Therefore, the sink mark suppression portion can be joined to the housing more easily than in a structure in which the sink mark suppression portion is joined to the housing separately from the insert. The sink mark suppression portion is arranged around the rib to effectively suppress sink marks on the housing caused by the rib. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. [Figure 2] FIG. 2 is a right side view of the electric operating machine with the right housing removed. [Figure 3] FIG. 10 is a view of the rib supporting the motor as seen from the right side. [Figure 4] FIG. [Figure 5] FIG. 4 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 10 is a right side view of the left insert member. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is a side view of an electric working machine according to another embodiment. [Figure 10] FIG. 10 is a side view of an electric working machine according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] According to another aspect of the present disclosure, the insert member has an exposed portion that is exposed from an outer surface of the housing. The sink mark suppression portion extends from the exposed portion. Therefore, the sink mark suppression portion can suppress sink marks around the exposed portion.

[0011] According to another aspect of the present disclosure, the sink mark suppression portion has an embedded portion that is embedded in the rib or the housing. Therefore, the embedded portion partially reduces the thickness of the rib or the housing around the rib. Therefore, the embedded portion can effectively suppress sink marks that may occur due to the thick wall thickness.

[0012] According to another aspect of the present disclosure, the embedded portion is located on one end side of the rib in the width direction. Therefore, compared to a configuration in which the embedded portion is located at the center of the rib in the width direction, the thickness of the sink mark suppression portion can be ensured, and the strength of the sink mark suppression portion itself can be maintained.

[0013] According to another aspect of the present disclosure, the embedded portion is embedded in the rib or the housing such that the connection point between the rib and the housing is equal to or less than half the thickness of the corresponding housing. Therefore, the embedded portion can reliably suppress sink marks caused by the rib.

[0014] According to another aspect of the present disclosure, the embedded portion is embedded in the housing and is located closer to the inner circumferential surface of the housing than halfway through the housing's thickness. Therefore, the embedded portion is provided so as not to make the housing too thin. Furthermore, by positioning the embedded portion close to the rib, it becomes easier to suppress sink marks caused by the rib.

[0015] According to another aspect of the present disclosure, the sink mark suppression portion has a protrusion that protrudes from an inner peripheral surface of the housing. The housing has a reinforcing portion that covers the protrusion of the sink mark suppression portion. Therefore, when the insert member is integrally molded with the housing, the protrusion can position the insert member. The reinforcing portion allows the sink mark suppression portion to be firmly attached to the housing.

[0016] According to another aspect of the present disclosure, the insert member has an exposed portion exposed from the outer surface of the housing. The sink mark suppression portion has a plurality of extending portions extending adjacent to each other from the exposed portion and a connecting portion connecting tips of the plurality of extending portions to each other. Therefore, the connecting portion increases the strength of the plurality of extending portions.

[0017] According to another aspect of the present disclosure, the sink mark suppression portion includes a long arm that extends perpendicular to the width direction of the rib and along the housing, multiple short arms that extend widthwise from the long arm and are adjacent to each other, and slits provided between the multiple short arms. Therefore, even if a thick rib is provided in the width direction, the multiple short arms extending widthwise can reduce the area of ​​the connection between the rib and the housing. This makes it possible to suppress sink marks caused by the thick rib. Furthermore, providing resin in the slits prevents excessive reduction in the strength of the connection between the housing and the rib.

[0018] According to another aspect of the present disclosure, the long arms, short arms, and slits are embedded in the ribs, thereby suppressing sink marks caused by the ribs without excessively reducing the strength of the ribs.

[0019] According to another aspect of the present disclosure, the rib supports a bearing that supports a rotating member. Therefore, the rib is thick to support the bearing. However, the long and short arms of the rib are thick, so sink marks due to the thick rib can be appropriately suppressed.

[0020] According to another aspect of the present disclosure, the outer surface of the housing is subjected to a surface treatment, thereby further enhancing the design of the outer surface.

[0021] According to another aspect of the present disclosure, the insert members are provided on both sides of the housing with the motor or the rotating member between them, so that the sink mark suppression portion can suppress sink marks on both sides of the motor or the rotating member.

[0022] According to another aspect of the present disclosure, the insert member has a logo that is exposed from the outer surface of the housing. Therefore, sink marks around the logo are suppressed, appropriately enhancing the design. In the embodiment, the registered trademark "makita" is displayed as the logo (see Figures 1 and 8). The logo, which is one of the features of the present disclosure, is exposed from the outer surface of the housing. By showing the actual logo in the figure, the feature can be best expressed. However, the logo is not limited to "makita" and may be any other registered trademark or any other letters, symbols, figures, etc.

[0023] According to another aspect of the present disclosure, the housing has a grip portion that is gripped by a user, thereby improving the handling of the electric power tool.

[0024] According to another aspect of the present disclosure, the housing is formed with a ventilating window that penetrates from the outer surface to the inner circumferential surface, thereby improving the heat dissipation of the electric operating machine.

[0025] According to another aspect of the present disclosure, the housing has a first housing and a second housing that sandwich the motor or the rotating member. Therefore, the motor or the rotating member can be easily accommodated by sandwiching it between the first housing and the second housing.

[0026] According to another aspect of the present disclosure, the housing has a boss into which a screw for connecting the first housing and the second housing is inserted, thereby making it possible to easily connect the first housing and the second housing to each other.

[0027] According to another aspect of the present disclosure, the motor is a brushless motor.

[0028] Next, one embodiment of the present disclosure will be described with reference to Figures 1 to 8. As shown in Figure 1, the electric work machine 10 is exemplified as a handheld saw used for cutting wood or the like. A user holds the electric work machine 10 in his / her hand and is positioned on the left side in Figure 1. In the following description, the side in front of the user is defined as the rear direction (user side), and the far side is defined as the front direction. The front-to-rear direction is defined based on a predetermined axis 3f. The up-down direction and the left-to-right direction are defined based on this front-to-rear direction and the user.

[0029] As shown in FIG. 2, the electric work machine 10 has a working unit 2 for performing cutting work and a housing 1 to which the working unit 2 is attached. The working unit 2 has a plate-shaped guide bar 2a extending in the front-to-rear and up-down directions and a circular saw chain 2b attached to the periphery of the guide bar 2a. The saw chain 2b has multiple cutters (not shown) connected to each other. The saw chain 2b rotates along the periphery of the guide bar 2a by the power of a drive unit 3, which will be described later. A user performs cutting work by pressing the rotating saw chain 2b against an object to be cut. The working unit 2 also has a work cover 2c that is placed over the saw chain 2b.

[0030] As shown in FIG. 2, the housing 1 is formed into a predetermined shape by injection molding. The housing 1 is configured to be separable in the left-right direction. The housing 1 has a left housing 1b and a right housing 1c. The left housing 1b and the right housing 1c are assembled to each other with a plurality of screws. The housing 1 has a plurality of bosses 1j into which the screws are inserted.

[0031] The housing 1 has a hollow shape that forms an accommodation space between the assembled left housing 1b and right housing 1c. The housing 1 has a housing main body 1a that accommodates a drive unit 3 that serves as a power source and a power transmission unit 4 that transmits the power of the drive unit 3 to the working unit 2. The housing main body 1a has a substantially cylindrical shape. The housing main body 1a extends along a predetermined axis 3f.

[0032] As shown in FIG. 2, the housing 1 has a grip 11 that is held by a user. The grip 11 extends diagonally downward and rearward from the lower part of the housing main body 1a. The grip 11 has a generally cylindrical shape. The housing 1 also has a battery mounting portion 13 that is connected to the lower part of the grip 11. The battery mounting portion 13 has a box shape that extends in a direction generally perpendicular to the extension direction of the grip 11. A controller 16 for controlling the operation of the electric work machine 10 is provided inside the battery mounting portion 13.

[0033] A battery pack 14 can be removably attached to the underside of the battery attachment section 13. The battery pack 14 is attached to the battery attachment section 13 by sliding it from the upper rear to the lower front. The battery pack 14 is electrically connected to the controller 16 when attached to the battery attachment section 13. This allows power to be supplied from the battery pack 14 to the controller 16. The battery pack 14 can be removed from the battery attachment section 13 and repeatedly charged and used with a separately provided charger.

[0034] As shown in FIG. 2, a trigger 12 that is pulled by the user with the fingertip is provided on the upper front side of the grip 11. A switch 15 that detects the pulling of the trigger 12 is provided inside the grip 11. The switch 15 is pushed rearward when the trigger 12 is pulled, thereby turning the switch 15 on. When the switch 15 is in the on state, it transmits a signal to the controller 16. The controller 16 operates the drive unit 3 based on the transmitted signal.

[0035] Also provided inside the housing 1 is a locking member 18 that switches between a state in which the pulling operation of the trigger 12 is permitted and a state in which it is restricted. The locking member 18 is located behind the trigger 12 and above the switch 15. The locking member 18 is rotatably supported relative to the housing 1. In its initial state, the locking member 18 is biased by a torsion spring 19 to a position in which it mechanically interferes with the trigger 12. When the trigger 12 is caught by the locking member 18, the pulling operation of the trigger 12 is restricted. When the locking member 18 is rotated to a position in which it does not interfere with the trigger 12, the pulling operation of the trigger 12 is permitted.

[0036] As shown in Figures 1 and 8, the locking member 18 has a left locking lever 1d and a right locking lever 1e that protrude from the housing 1 on both the left and right sides. By pressing down either of the locking levers 1d, 1e, the locking member 18 rotates to a position where it does not interfere with the trigger 12. For example, referring to Figure 8, a user holds the electric working machine 10 by grasping the grip 11 with their right hand. Then, the user presses down the left locking lever 1d with their right thumb. This releases the interference of the locking member 18, enabling the trigger 12 to be pulled. In this state, the user can pull the trigger 12 with the index finger of their right hand to drive the working unit 2.

[0037] As shown in FIGS. 1 and 8, the electric work machine 10 has a hand guard 17 that protects the user's hands gripping the grip 11. The hand guard 17 is a strip-shaped member that straddles the lower part of the housing main body 1a and the front part of the battery mounting portion 13. The hand guard 17 covers the grip 11 and the trigger 12 from the front. The hand guard 17 is made of a rubber material such as nitrile butadiene rubber. The hand guard 17 prevents the saw chain 2b, if broken during cutting work, from coming into contact with the user's hands gripping the grip 11. In this way, the hand guard 17 can protect the user's hands.

[0038] As shown in Figures 2 and 4, the drive unit 3 has a motor 3a having a generally cylindrical shape. The motor 3a is, for example, a DC brushless motor. The motor 3a has a stator 3c wound with coils 3b and a rotor 3d equipped with a permanent magnet. The rotor 3d is disposed inside the stator 3c. A motor shaft 3e is integrally formed at the center of the rotor 3d. The motor shaft 3e is rotatably supported by bearings 3g disposed in front and behind the motor 3a. As a result, the rotor 3d is configured to rotate integrally with the motor shaft 3e around an axis 3f.

[0039] A sensor board 3i equipped with a sensor (not shown) such as a Hall IC is provided behind the motor 3a. The sensor detects the rotational position of a permanent magnet provided on the rotor 3d. The sensor thereby detects the rotation speed of the motor 3a. The sensor outputs the detected rotation speed to the controller 16. This allows the controller 16 to grasp the operating state of the motor 3a.

[0040] A cooling fan 3h fixed to the motor shaft 3e is provided in front of the motor 3a. The cooling fan 3h rotates as the motor shaft 3e rotates. When the cooling fan 3h rotates, it creates an airflow from the front to the rear along the axis 3f. Air is drawn in through the left air intake 1f (see FIG. 8) and the right air intake 1g (see FIG. 1) and is discharged through the left air exhaust 1h and the right air exhaust 1i (see FIG. 2). This allows the motor 3a to be cooled as it is driven.

[0041] As shown in FIG. 2, a power transmission unit 4 is provided in front of the cooling fan 3h. The power transmission unit 4 has a reducer 4a for reducing the power of the motor 3a. The reducer 4a has a first bevel gear 4b connected to the front end of the motor shaft 3e and a second bevel gear 4c meshing with the first bevel gear 4b. Therefore, the first bevel gear 4b rotates as the motor shaft 3e rotates due to the drive of the motor 3a. The second bevel gear 4c then rotates in response to the rotation of the first bevel gear 4b. A drive shaft 4d, which has an axis extending in the left-right direction, is connected to the second bevel gear 4c. Therefore, as the second bevel gear 4c rotates, the drive shaft 4d rotates integrally with the second bevel gear 4c.

[0042] As shown in Figure 8, a sprocket 2k that rotates integrally with the drive shaft 4d is provided on the left side of the drive shaft 4d. A saw chain 2b is stretched across the sprocket 2k. As a result, as the sprocket 2k rotates, the saw chain 2b rotates along the guide bar 2a. As described above, the rotation of the motor shaft 3e is transmitted to the saw chain 2b via the reducer 4a, the drive shaft 4d, and the sprocket 2k (see Figure 2).

[0043] As shown in Figure 8, the sprocket 2k is exposed to the left from the housing main body 1a of the housing 1. As shown by the imaginary line in Figure 8, a sprocket cover 2d is placed on the exposed sprocket 2k from the left. The sprocket cover 2d has a cover main body 2e and a locking member 2g. The cover main body 2e has a sleeve 2f. A bolt 2n protruding from the elongated hole 2m of the guide bar 2a is passed through the sleeve 2f. The locking member 2g has a locking member main body 2h, a nut 2i, and a claw portion 2j. The sprocket cover 2d is attached to the housing main body 1a by passing the bolt 2n through the sleeve 2f and tightening the nut 2i. By tightening the nut 2i, the guide bar 2a is sandwiched and fixed between the housing main body 1a and the sprocket cover 2d.

[0044] Additionally, the user can easily loosen or tighten the nut 2i on the bolt 2n by rotating the claw portion 2j, which is raised relative to the locking member main body 2h, around the axis 3f of the bolt 2n. Loosening the nut 2i allows the guide bar 2a to slide along the elongated hole 2m relative to the housing main body 1a. This changes the distance between the guide bar 2a and the sprocket 2k. This allows the tension of the saw chain 2b to be adjusted. Furthermore, the nut 2i can be fastened with sufficient tightening torque without using any special tools.

[0045] As shown in FIG. 2, a worm gear 4e that rotates integrally with the drive shaft 4d is attached to the right side of the drive shaft 4d. A worm wheel 5c of an oil pump 5b meshes with the worm gear 4e. Therefore, when the drive shaft 4d rotates, the oil pump 5b is driven. The oil pump 5b pumps lubricating oil stored in the oil tank 5 from the suction portion 5d of the oil supply passage 5e. The pumped lubricating oil passes through the oil supply passage 5e and the discharge portion 5f and is supplied to the guide bar 2a and the saw chain 2b. The lubricating oil reduces friction between the guide bar 2a and the saw chain 2b. This allows the working unit 2 to be driven appropriately.

[0046] As shown in Figures 1 and 2, the oil tank 5 is provided on the front right side of the housing body 1a. The oil tank 5 has a filler opening (not shown) that opens to the right and a cap 5a that covers the filler opening. The cap 5a is removably attached to the filler opening. Lubricating oil can be refilled into the oil tank 5 through the filler opening. The cap 5a and the filler opening are exposed to the outside of the housing body 1a. This makes it easy to fill the oil tank 5 through the filler opening without disassembling the housing body 1a.

[0047] As shown in FIG. 2, a plurality of ribs 9 protrude from the inner peripheral surface of the housing main body 1a. Each rib 9 protrudes from the inner peripheral surface of the left housing 1b and the inner peripheral surface of the right housing 1c. The left and right ribs 9 are formed symmetrically with each other. The motor 3a is sandwiched between the ribs 9. This allows the motor 3a to be supported by the housing main body 1a.

[0048] As shown in FIG. 4, each rib 9 extends in the vertical direction. Each rib 9 is formed with a recess in the approximate center in the vertical direction. This allows each rib 9 to conform to the shape of the motor 3a. Each rib 9 has a motor support portion 9a that supports the motor 3a and a bearing support portion 9f that supports the bearing 3g. The motor support portion 9a has a first support portion 9b that supports the motor 3a from the front, a second support portion 9c and a third support portion 9d that support the motor 3a from the sides, and a fourth support portion 9e that supports the motor 3a from the rear. The bearing support portion 9f has multiple through holes 9g that penetrate in the protruding direction. Each through hole 9g reduces the weight of the bearing support portion 9f.

[0049] The ribs 9 are formed during injection molding of the housing 1. Generally, with this type of configuration, sink marks can occur on the outer surface of the housing due to localized shrinkage differences caused by the ribs. For example, as shown by the dotted lines in FIG. 5, sink marks can occur on the outer surface where the ribs 9 are formed (sink mark occurrence areas 1k). Furthermore, as shown in FIGS. 1 and 8, the logos 6c are exposed on both the left and right sides of the outer surface of the housing main body 1a of the present disclosure. The outer surface of the housing main body 1a is also subjected to a mirror finish to enhance the design. Therefore, if sink marks occur on the outer surface of the housing main body 1a, the gloss created by the mirror finish can accentuate the sink marks around the logos 6c. This could significantly impair the design of the housing main body 1a.

[0050] For this reason, as shown in Figure 3, an insert member 6 equipped with a sink mark suppression portion 6d for suppressing sink marks is integrally joined to the housing main body 1a. The insert member 6 is joined to the housing main body 1a by being set in the mold during injection molding of the housing 1. The insert members 6 include a left insert member 6a joined to the left housing side 1b and a right insert member 6b joined to the right housing side 1c (see Figure 1). Each insert member 6 has a different color from the housing main body 1a.

[0051] The left insert member 6a and the right insert member 6b are configured symmetrically to each other. The following describes the configuration of the left insert member 6a in detail as a representative example. As shown in FIGS. 6 and 7, the left insert member 6a is a resin molded product formed by injection molding. The left insert member 6a has the logo 6c and a sink mark suppression portion 6d extending from the logo 6c. The sink mark suppression portion 6d has a base portion 6e connecting each character of the logo 6c to each other and an extension portion 6f extending from the base portion 6e. The base portion 6e extends in the front-to-rear direction like a thin plate. The extension portion 6f has an upper extension portion 7 extending upward from the base portion 6e and a lower extension portion 8 extending downward from the base portion 6e.

[0052] As shown in Figures 6 and 7, the upper extension 7 has four upper arms extending upward and aligned in the front-to-back direction. The upper arms are, from the front, the first upper arm 7a, the second upper arm 7b, the third upper arm 7c, and the fourth upper arm 7d. Each of the upper arms 7a, 7b, 7c, and 7d extends in a stepped manner to the right from the base 6e. The tip of each of the upper arms 7a, 7b, 7c, and 7d forms an inclined portion 7e that slopes upward and to the right. The upper extension 7 also has two connecting portions that connect the upper arms 7a, 7b, 7c, and 7d in the front-to-back direction. The connecting portions include a first connecting portion 7f that connects the tips of the upper arms 7a, 7b, 7c, and 7d, and a second connecting portion 7g that connects the approximate centers of the second upper arm 7b, the third upper arm 7c, and the fourth upper arm 7d in the up-to-down direction. The first connecting portion 7f and the second connecting portion 7g increase the strength of each of the upper arms 7a, 7b, 7c, and 7d.

[0053] The upper extension 7 also has an upper expanded diameter portion 7h that partially increases the front-to-rear width of the third upper arm 7c. The upper expanded diameter portion 7h is formed at the connection point between the third upper arm 7c and the base portion 6e and at the connection point between the third upper arm 7c and the second connecting portion 7g. The upper extension 7 also has five short arms 7i extending rearward from the fourth upper arm 7d. The short arms 7i are arranged in a line in the vertical direction. Slits 7j are formed between each of the short arms 7i.

[0054] As shown in Figures 6 and 7, the lower extension 8 has four lower arms extending downward and aligned in the front-to-rear direction. The lower arms are, from the front, the first lower arm 8a, the second lower arm 8b, the third lower arm 8c, and the fourth lower arm 8d. The lower arms 8a, 8b, 8c, and 8d extend in a stepped manner to the right from the base 6e. The lower extension 8 also has a third connecting portion 8e that connects the tips of the lower arms 8a, 8b, 8c, and 8d in the front-to-rear direction. The third connecting portion 8e increases the strength of the lower arms 8a, 8b, 8c, and 8d. The lower extension 8 also has a lower enlarged diameter portion 8f that partially increases the front-to-rear width of the third lower arm 8c. The lower enlarged diameter portion 8f is formed at the connection point between the third lower arm 8c and the third connecting portion 8e.

[0055] The left insert member 6a has multiple positioning pins 6p protruding rightward from various points on the base portion 6e and the extension portion 6f. Each positioning pin 6p is fitted into a mold when the left insert member 6a is insert-molded. Therefore, the left insert member 6a is set in the mold. This allows the left insert member 6a to be joined at an appropriate position to the housing main body 1a.

[0056] As shown in Figures 3 and 4, the left insert member 6a is integrally joined to the housing main body 1a. As a result, the sink mark suppression portion 6d is embedded in the housing main body 1a. The inclined portion 7e is configured to follow the curved shape of the housing main body 1a. The base portion 6e of the sink mark suppression portion 6d and the connecting portions 7f, 7g, and 8e are partially supported by the reinforcing portion 1r of the housing main body 1a. The reinforcing portion 1r has a covering portion 1s that covers the base portion 6e and the connecting portions 7f, 7g, and 8e so as to sandwich them between itself and the inner surface of the housing main body 1a, and a clamping portion 1t that clamps the base portion 6e and the connecting portions 7f, 7g, and 8e along the in-plane direction of the housing main body 1a.

[0057] As shown in FIG. 4, for example, the second connecting portion 7g of the upper extension portion 7 protrudes to the right (inward) from the inner circumferential surface of the housing main body 1a. A clamping portion 1t is formed to sandwich the second connecting portion 7g in the vertical direction. This clamping portion 1t also protrudes from the inner circumferential surface of the housing main body 1a. This clamping portion 1t is flush with the tip surface of the second connecting portion 7g. Furthermore, both front-rear portions of the second connecting portion 7g are covered from the right by a covering portion 1s. This covering portion 1s is integrally joined to the clamping portion 1t, which sandwiches the second connecting portion 7g. This provides strong support for the second connecting portion 7g. Similarly, portions of the sink mark suppression portion 6d other than the second connecting portion 7g are also firmly supported by the covering portion 1s and the clamping portion 1t. In this way, the sink mark suppression portion 6d is firmly attached to the housing 1 by being embedded in the housing main body 1a and by each reinforcing portion 1r.

[0058] 3 and 4, the upper arms 7a, 7b, 7c, and 7d of the upper extension portion 7 and the lower arms 8a, 8b, 8c, and 8d of the lower extension portion 8 are arranged along the ribs 9. Specifically, the first upper arm 7a, the second upper arm 7b, and the third upper arm 7c are arranged along the motor support portion 9a. The fourth upper arm 7d is arranged along the motor support portion 9a and the rear bearing support portion 9f. The first lower arm 8a, the second lower arm 8b, the third lower arm 8c, and the fourth lower arm 8d are arranged along the motor support portion 9a.

[0059] As shown in FIG. 5, the first upper arm 7a is disposed along the first support portion 9b. The first upper arm 7a is embedded in the connection portion between the housing main body 1a and the first support portion 9b (embedded portion 6m). The first upper arm 7a is embedded in the base end portion of the first support portion 9b from the rear end side. This allows the thickness of the base end portion of the first support portion 9b to be appropriately thin. Therefore, the base end portion of the first support portion 9b solidifies relatively quickly during molding of the housing 1. This reduces the effect of resin shrinkage during molding of the first support portion 9b on the sink mark occurrence portion 1k of the housing main body 1a. As a result, sink marks are less likely to occur in the sink mark occurrence portion 1k of the housing main body 1a.

[0060] The first upper arm 7a is embedded in the housing main body 1a from the inner peripheral surface side. The first upper arm 7a protrudes from the inner peripheral surface of the housing main body 1a and the rear end of the first support portion 9b (protrusion 6n). The protrusion 6n ensures the thickness of the first upper arm 7a, thereby maintaining the strength of the first upper arm 7a appropriately. The protrusion 6n can also be used as a positioning portion for the mold during insert molding.

[0061] The second upper arm 7b is disposed along the second support portion 9c. The second upper arm 7b is embedded in the connection portion between the housing main body 1a and the second support portion 9c (embedded portion 6m). The second upper arm 7b is embedded in the base end portion of the second support portion 9c from the front end side. This allows the thickness of the base end portion of the second support portion 9c to be appropriately thin. This prevents sink marks at the sink mark occurrence portion 1k caused by the second support portion 9c. The second upper arm 7b is embedded in the housing main body 1a from the inner peripheral surface side. The second upper arm 7b protrudes from the inner peripheral surface of the housing main body 1a and the front end of the second support portion 9c (protruding portion 6n).

[0062] The third upper arm 7c is disposed along the third support portion 9d. The third upper arm 7c is embedded in the connection portion between the housing main body 1a and the third support portion 9d (embedded portion 6m). The third upper arm 7c is embedded over the entire area in the front-to-rear direction. In addition, the upper expanded diameter portion 7h extending from the third upper arm 7c is also embedded in the connection portion between the housing main body 1a and the third support portion 9d. This allows the base end portion of the third support portion 9d, which is formed with a relatively large width in the front-to-rear direction, to be appropriately thin. This makes it possible to suppress sink at the sink mark generation portion 1k due to the third support portion 9d.

[0063] The fourth upper arm 7d and the short arm 7i are arranged along the bearing support portion 9f. The fourth upper arm 7d and the short arm 7i are embedded in the connection portion between the housing main body 1a and the bearing support portion 9f (embedded portion 6m). The fourth upper arm 7d and the short arm 7i are embedded over a wide range in the front-to-rear direction of the base end of the bearing support portion 9f. This allows the base end of the bearing support portion 9f, which is formed with a relatively thick width in the front-to-rear direction, to be appropriately thinned. In addition, multiple short arms 7i are formed side by side in the vertical direction (see FIG. 6). This allows the vertical thickness of the base end of the bearing support portion to be thinned. This allows sink marks at the sink mark generation portion 1k due to the bearing support portion 9f to be appropriately suppressed. In addition, the thickness of the tip portion of the bearing support portion 9f extending rightward from the base end is partially thinned by the through hole 9g. This further reduces sink marks due to the bearing support portion 9f.

[0064] Furthermore, resin is formed in each slit 7j (see FIG. 6) between each short arm 7i so as to directly connect the housing main body 1a and the bearing support portion 9f. This allows the strength of the base end of the bearing support portion 9f to be relatively increased compared to a configuration without the slits 7j. This allows adjustment so that the strength of the base end of the bearing support portion 9f is not reduced too much. In this way, it is possible to appropriately achieve both the suppression of sink marks in the bearing support portion 9f by the fourth upper arm 7d and the short arm 7i and the assurance of strength of the bearing support portion 9f by the slits 7j.

[0065] Although not shown, the lower arms 8a, 8b, 8c, and 8d of the lower extension 8 are also embedded in the connection points between the housing main body 1a and the ribs 9. This allows the thickness of the base end of each rib 9 of the lower arms 8a, 8b, 8c, and 8d to be thin. Therefore, sink marks caused by each rib 9 can also be suppressed for each of the lower arms 8a, 8b, 8c, and 8d.

[0066] As shown in FIG. 5, it is desirable that the rib thickness B of the thinner base end of each rib 9 be, for example, less than half the housing thickness A of the housing main body 1a. More preferably, it is desirable that the rib thickness B be approximately 40% of the housing thickness A. Even if the rib thickness B is thin, the embedded portion 6m supports each rib 9, thereby preventing a decrease in the strength of each rib 9. Furthermore, even if the sink mark suppression portion 6d is provided, the thickness of the tip of each rib 9 is maintained. Therefore, each rib 9 can adequately support the motor 3a.

[0067] As described above, the sink mark suppression portion 6d can appropriately suppress sink marks caused by each rib 9. Moreover, as shown in FIGS. 6 and 7, the sink mark suppression portion 6d is formed to extend around the logo 6c. This makes it possible to appropriately suppress sink marks that may occur around the logo 6c. Furthermore, as shown in FIG. 8, the logo 6c is exposed from the outer surface of the housing main body 1a by joining the left insert member 6a. This makes it possible to efficiently assemble the logo 6c into the housing main body 1a and suppress sink marks around it.

[0068] As described above, as shown in FIG. 2 , the electric work machine 10 has a motor 3a and a rotating member rotated by the motor 3a. The motor 3a or the rotating member is housed in the housing 1. Ribs 9 protrude from the inner circumferential surface of the housing 1. The ribs 9 support the motor 3a or the rotating member. An insert member 6 is integrally joined to the housing 1. The insert member 6 is a different color from the outer surface of the housing 1 and is exposed from the outer surface of the housing 1. The insert member 6 is provided with a sink mark suppression portion 6d. The sink mark suppression portion 6d is disposed around the rib 9 to suppress sink marks in the housing 1 due to the rib 9. Therefore, the sink mark suppression portion 6d is integrally joined to the housing 1 together with the insert member 6. Therefore, the sink mark suppression portion 6d can be more easily joined to the housing 1 than in a structure in which the sink mark suppression portion 6d is bonded to the housing 1 separately from the insert member. The sink mark suppression portion 6d is disposed around the rib 9 to effectively suppress sink marks in the housing 1 due to the rib 9.

[0069] 1, the insert member 6 has an exposed portion that is exposed from the outer surface of the housing 1. The sink mark suppression portion 6d extends from the exposed portion, and therefore, the sink mark suppression portion 6d can suppress sink marks around the exposed portion.

[0070] 5, the sink mark suppression portion 6d has an embedded portion 6m that is embedded in the rib 9 or the housing 1. Therefore, the embedded portion 6m partially reduces the thickness of the rib 9 or the housing 1 around the rib 9. Therefore, the embedded portion 6m can effectively suppress sink marks that may occur due to the thick wall thickness.

[0071] 5, the embedded portion 6m is located on one end side in the width direction of the rib 9. Therefore, compared to a configuration in which the embedded portion 6m is provided in the center in the width direction of the rib 9, the thickness of the sink mark suppression portion 6d can be ensured, and the strength of the sink mark suppression portion 6d itself can be maintained.

[0072] 5, the embedded portion 6m is embedded in the rib 9 or the housing 1 so that the connection point between the rib 9 and the housing 1 is less than half the thickness of the corresponding housing 1. Therefore, the embedded portion 6m can reliably suppress sink marks caused by the rib 9.

[0073] 5, the embedded portion 6m is embedded in the housing 1 and is located closer to the inner circumferential surface of the housing 1 than halfway through the thickness of the housing 1. Therefore, the embedded portion 6m is provided so as not to make the thickness of the housing 1 too thin. Furthermore, by positioning the embedded portion 6m close to the rib 9, sink marks caused by the rib 9 can be more easily suppressed.

[0074] 3 and 4, the sink mark suppression portion 6d has a protrusion 6n that protrudes from the inner circumferential surface of the housing 1. The housing 1 has a reinforcing portion 1r that covers the protrusion 6n of the sink mark suppression portion 6d. Therefore, when the insert member 6 is integrally molded with the housing 1, the protrusion 6n can position the insert member 6. The reinforcing portion 1r allows the sink mark suppression portion 6d to be firmly attached to the housing 1.

[0075] 6 and 7, the insert member 6 has an exposed portion that is exposed from the outer surface of the housing 1. The sink mark suppression portion 6d has multiple extending portions 6f that extend adjacent to each other from the exposed portion and a connecting portion that connects the tips of the multiple extending portions 6f to each other. Therefore, the connecting portion increases the strength of the multiple extending portions 6f.

[0076] 6 and 7, the sink mark suppression portion 6d has a long arm that extends perpendicular to the width direction of the rib 9 and along the housing 1, multiple short arms 7i that extend widthwise from the long arm and are adjacent to each other, and slits 7j provided between the multiple short arms 7i. Therefore, even if a thick rib 9 is provided in the width direction, the multiple short arms 7i extending in the width direction can reduce the area of ​​the connection portion between the rib 9 and the housing 1. In this way, sink marks caused by the thick rib 9 can be suppressed. Moreover, by providing resin in the slits 7j, the strength of the connection portion between the housing 1 and the rib 9 can be prevented from being reduced too much.

[0077] 3, the long and short arms 7i and the slits 7j are filled with the rib 9. Therefore, sink marks due to the rib 9 can be suppressed without reducing the strength of the rib 9 too much.

[0078] As shown in Fig. 4, the ribs 9 support bearings 3g that support a rotating member. Therefore, the ribs 9 are thick to support the bearings 3g. However, the long and short arms 7i can appropriately suppress sink marks caused by the thick ribs 9.

[0079] As shown in Fig. 1, the outer surface of the housing 1 is subjected to a surface treatment, which further enhances the design of the outer surface.

[0080] 2, the insert members 6 are provided on both sides of the housing 1 with the motor 3a or the rotating member sandwiched therebetween. Therefore, the sink mark suppressing portions 6d can suppress sink marks on both sides of the motor 3a or the rotating member.

[0081] 1 and 8, the insert member 6 has a logo 6c exposed from the outer surface of the housing 1. Therefore, sink marks around the logo 6c are suppressed, thereby appropriately improving the design.

[0082] 1, the housing 1 has a grip portion that is gripped by a user, which improves the ease of handling of the electric operating machine 10.

[0083] 1, the housing 1 is formed with a ventilating window that penetrates from the outer surface to the inner circumferential surface, thereby improving the heat dissipation performance of the electric operating machine 10.

[0084] 2, the housing 1 has a first housing and a second housing that sandwich the motor 3a or the rotating member. Therefore, the motor 3a or the rotating member can be easily accommodated by sandwiching it between the first housing and the second housing.

[0085] 2, the housing 1 has bosses 1j into which screws for connecting the first and second housings are inserted, so that the first and second housings can be easily connected to each other.

[0086] As shown in FIG. 2, the motor 3a is a brushless motor.

[0087] Various modifications can be made to the above-described embodiment. For example, a handheld saw has been exemplified as the power tool. Alternatively, as shown in Figures 9 and 10, the insert member 6 of the present disclosure can be applied to a chainsaw 20 or a grinder 30. The insert member 6 can also be applied to various other electric power machines and power tools, as long as the housing has ribs that support the motor or rotating member. For example, the insert member 6 can be similarly applied to hammers, hammer drills, drills, drivers, wrenches, circular saws, reciprocating saws, jigsaws, cutters, planes, nail guns (including tack guns), hedge trimmers, lawn mowers, lawn clippers, brush cutters, cleaners, blowers, sprayers, spreaders, dust collectors, etc.

[0088] The housing may be configured to accommodate only the motor or the rotating member. The insert member may be configured to be provided around a rib that supports the rotating member. The insert member may be configured to be integrally joined to the housing body by two-color molding. The rotating member may be any member such as a power transmission unit, a fan, a resin case, or anything else that is rotated by the motor. The exposed portion of the insert member is not limited to a logo, and may be any member that is exposed from the outer surface of the housing.

[0089] The sink mark suppression portion can be formed in any shape to match the position and width of the rib. For example, the number of upper arms and lower arms is not limited to four, but may be one to three, or five or more. The enlarged diameter portion of the extension portion may be provided at any appropriate location, or may not be provided at all. The sink mark suppression portion may be configured to extend only from the upper or lower side of the exposed portion. The long arms may not have slits. The sink mark suppression portion is configured to be embedded in the connection portion between the housing main body and the rib. Alternatively, the sink mark suppression portion may be configured to be embedded only in the housing main body or only in the rib. The sink mark suppression portion may not have a protruding portion protruding from the housing main body, and may be entirely embedded in the housing main body or the rib. The embedded portions of the sink mark suppression portion may be located at both widthwise ends of a single rib. [Explanation of symbols]

[0090] 10 Electric work equipment 11 Grip (holding part) 12 Triggers 13 Battery mounting section 14 Battery pack 15 Switch 16 Controllers 17 Handguard 18 Locking member 19 Torsion spring 1. Housing 1a Housing body 1b Left housing (first housing) 1c Right housing (second housing) 1d Left lock lever 1e Right side lock lever 1F left side air intake (ventilation window) 1g Right side air intake (ventilation window) 1h Left side exhaust port (ventilation window) 1i Right side exhaust port (wind window) 1j boss 1k Sink mark area 1r Reinforcement part 1s Cover 1t clamping part 2 Working section 2a Guide bar 2b saw chain 2c Work cover 2d sprocket cover 2e Cover body 2F Sleeve 2g Locking member 2h Locking member body 2i nut 2j Claw part 2k sprocket 2m long hole 2n volts 3 Drive unit 3a motor 3b coil 3c Stator 3d rotor 3e Motor shaft 3f axis 3g bearing 3h Cooling fan 3i Sensor Board 4 Power transmission part (rotating member) 4a reducer 4b 1st bevel gear 4c 2nd bevel gear 4d Drive shaft 4e Worm gear 5 Oil Tank 5a Cap 5b Oil pump 5c worm wheel 5d Intake section 5e Oil supply passage 5f Discharge part 6 Insert material 6a Left insert member 6b Right insert member 6c Logo (exposed area) 6d Sinkage suppression part 6e Base 6f extension 6m embedded section 6n protrusion 6p Locating Pin 7 Upper extension 7a First upper arm 7b Second upper arm 7c 3rd upper arm 7d Fourth upper arm (long arm) 7e Slope 7f 1st connection part 7g 2nd connection part 7h Upper enlarged diameter part 7i short arm 7j slit 8 Lower extension 8a 1st lower arm 8b 2nd lower arm 8c 3rd lower arm 8d 4th lower arm 8e 3rd connection part 8f Lower expanded diameter part 9. Ribs 9a Motor support 9b 1st support part 9c 2nd support part 9d Third support part 9e 4th support part 9f Bearing support part 9g through hole A Housing Thickness B Rib Thickness 20 Chainsaw 30 Grinder

Claims

1. An electric work machine, A motor; a rotating member rotated by the motor; a housing that accommodates the motor or the rotating member; a rib protruding from an inner peripheral surface of the housing to support the motor or the rotating member; an insert member that has a color different from the outer surface of the housing and is integrally joined to the housing so as to be exposed from the outer surface; The electric operating machine has a sink mark suppression portion that is provided on the insert member and arranged around the rib to suppress sink marks on the housing caused by the rib.

2. The electric operating machine according to claim 1, the insert member has an exposed portion exposed from the outer surface of the housing, The sink mark suppression portion extends from the exposed portion of the electric work machine.

3. The electric operating machine according to claim 1 or 2, The sink mark suppression portion has an embedded portion that is embedded in the rib or the housing.

4. The electric operating machine according to claim 3, The embedded portion is located on one end side of the rib in the width direction.

5. The electric operating machine according to claim 3 or 4, The embedded portion is embedded in the rib or the housing so that the width of the connection point between the rib and the housing is equal to or less than half the thickness of the corresponding housing.

6. The electric operating machine according to any one of claims 3 to 5, The embedded portion is embedded in the housing and is located closer to the inner circumferential surface of the housing than halfway through the thickness of the housing.

7. The electric operating machine according to any one of claims 1 to 6, the sink mark suppression portion has a protruding portion protruding from the inner circumferential surface of the housing, The housing has a reinforcing portion that covers the protruding portion of the sink mark suppression portion.

8. An electric operating machine according to any one of claims 1 to 7, the insert member has an exposed portion exposed from the outer surface of the housing, The sink mark suppression portion of the electric work machine includes a plurality of extension portions extending adjacent to each other from the exposed portion, and a connecting portion connecting the tips of the plurality of extension portions to each other.

9. An electric operating machine according to any one of claims 1 to 8, The sink mark suppression portion is an electric work machine having a long arm that extends perpendicular to the width direction of the rib and in a direction along the housing, a plurality of short arms that extend from the long arm in the width direction and are adjacent to each other, and slits that are provided between the plurality of short arms.

10. The electric operating machine according to claim 9, The long arm, the short arm and the slit are embedded in the rib.

11. The electric operating machine according to claim 10, The rib supports a bearing of the motor.

12. An electric operating machine according to any one of claims 1 to 11, The outer surface of the housing is subjected to a surface treatment.

13. An electric operating machine according to any one of claims 1 to 12, The insert members are provided on both sides of the housing with the motor or the rotating member in between.

14. An electric operating machine according to any one of claims 1 to 13, The insert member has a logo exposed from the outer surface of the housing.

15. An electric operating machine according to any one of claims 1 to 14, The housing has a grip portion that is held by a user.

16. An electric operating machine according to any one of claims 1 to 15, The housing has a ventilating window formed therein, the ventilating window extending from the outer surface to the inner circumferential surface.

17. An electric operating machine according to any one of claims 1 to 16, The housing is an electric working machine having a first housing and a second housing that sandwich the motor or the rotating member.

18. The electric operating machine according to claim 17, The housing has a boss into which a screw is inserted to connect the first housing and the second housing.

19. An electric operating machine according to any one of claims 1 to 18, The electric working machine, wherein the motor is a brushless motor.

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