WO2020175006A1 - Electric work machine and method for forming housing thereof - Google Patents
Electric work machine and method for forming housing thereof Download PDFInfo
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- WO2020175006A1 WO2020175006A1 PCT/JP2020/003662 JP2020003662W WO2020175006A1 WO 2020175006 A1 WO2020175006 A1 WO 2020175006A1 JP 2020003662 W JP2020003662 W JP 2020003662W WO 2020175006 A1 WO2020175006 A1 WO 2020175006A1
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- WIPO (PCT)
- Prior art keywords
- rib
- housing
- ribs
- working machine
- electric working
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/02—Construction of casings, bodies or handles
Definitions
- the present invention relates to an electric working machine in which a motor is built in a housing and a method for molding the housing.
- the housing is provided with a vent hole serving as a wind window for cooling the motor. It was desired to prevent foreign matter such as dust and water droplets from entering through the mouth.
- the housing of the electric working machine has a structure in which the housing is divided into two parts on the left and right sides, the direction of extraction of the cavity part of the divided molding die and the core part fitted therein is opposite to each other. Therefore, in the case of providing a rib on the vent hole in consideration of dustproofness, by arranging the rib almost perpendicular to the extraction direction of the core part, the distance restricted by the draft angle is short and the desired vent shape was possible.
- Fig. 14 (8) to (M) show the ventilation holes 2 of the housing 200 to enhance the dustproof property.
- Ha (eight) A side cross-sectional view, (0) is a cross-sectional view taken along line XX of (8), and (M) is an explanatory view showing the appearance of the housing 200.
- the ventilation hole 20 1 is provided on the side surface of the housing 200 0 that has a cylindrical shape and houses the motor, but the outer ribs 20 2 provided on the ventilation hole 20 1
- the inner ribs 203 are formed in parallel with the axial direction of the tubular portion 203 of the housing 200.
- a molding die 300 having a core portion 300 that can be fitted into the outer casing 202, and an outer rib 202 provided in the ventilation hole 201 of the housing 200 and an arrangement that does not overlap the outer rib 202. It is considered to mold the inner ribs 203 of the at one time.
- the first cavity portion 301 and the second cavity portion 302 are reciprocally movable in the vertical direction, and the core portion 303 is reciprocally movable in the X direction orthogonal to the vertical direction, and the three members are joined.
- the molding space of the housing 200 is filled with resin for molding (eg injection molding).
- the outer ribs 20 2 provided on the air vents 20 1 have the first and second cavity portions 3 0 1, on both sides of the outer rib 20 2 on the side surface of the housing. 3 0 2 convex part It is performed by forming slit-shaped openings 205 by means of 302.
- the inner side ribs 203 provided in the ventilation hole 201 are formed by providing the core portion 303 with a recessed portion 303 which becomes the inner rib 203 inside the side surface of the housing 200. ..
- the second cavity portion 30 2 are separated from each other by moving the core portion 30 3 in the pull-out direction of the X direction orthogonal to the vertical direction.
- the die is moved by moving 3 02 in the direction of the bird's eye so that they are separated from each other.
- the width dimension of the outer rib 202 that is orthogonal to the X direction and the vertical direction is determined by the draft angle so that the outer diameter of the tubular shape of the housing 200 is outside the radial direction. It is getting smaller toward the side.
- the core portion 303 is arranged in the longitudinal direction of the inner ribs 203. ⁇ 2020/175006 3 ⁇ (:171? 2020 /003662
- each slit-shaped opening 205 that is the outer opening of the ventilation hole 201 corresponds to the width of the inner rib 203, as shown in Fig. 14 (o).
- the opening width is large, and the opening width becomes smaller in the pulling direction of the core portion 303.
- Patent Document 1 Japanese Patent Laid-Open No. 2 0 1 8 _ 1 8 7 7 0 1
- each rib is viewed in the side view of the housing having the tubular shape of the electric working machine. Becomes a slender trapezoidal shape, the width dimension of the slit-shaped opening on the outer surface of the housing becomes large and it becomes impossible to suppress the intrusion of foreign matter, or if the width dimension of the slit-shaped opening is reduced, There was a risk that the ribs would become thin and the strength would decrease.
- a first aspect of the present invention is an electric working machine.
- the electric working machine has a motor and a single tubular shape, and a housing for housing the motor therein, a ventilation hole provided on a predetermined outer surface of the housing for communicating the inside and outside of the housing, and the ventilation.
- a plurality of ribs provided in the mouth wherein the plurality of ribs include a first rib and a second rib that are different in position in a penetrating direction penetrating the inside and the outside of the housing, and the first rib and The second rib is integrally molded so as to have a portion that does not overlap with the predetermined outer surface when viewed in the penetrating direction.
- the ventilation port is provided on a side surface of the housing, communicates with the inside and outside of the housing along a radial direction of the tubular shape as the penetration direction, and the first rib and the second rib. It is preferable that the ribs have different positions in the radial direction and do not overlap in the radial direction.
- the longitudinal direction of the second rib may be non-parallel to the axial direction and the radial direction of the tubular shape.
- the position of the second rib in the penetrating direction is arranged inside the first rib, and the width of the second rib in the penetrating direction viewed on the predetermined outer surface is the penetrating direction. It is said that the side surface along the longitudinal direction of the second rib is formed so as to be inclined with respect to the penetrating direction so as to become smaller toward the inside.
- the second rib has a widthwise dimension of the predetermined outer surface as viewed in the penetrating direction that is substantially constant in the longitudinal direction.
- a plurality of the first ribs and a plurality of the second ribs are preferably provided.
- a second aspect of the present invention is a method for molding a housing of an electric working machine.
- the method of molding the housing of the electric working machine is such that the first and second cavities that can be brought into contact with and separated from each other and the core that can be fitted into the first and second cavities in the joined state are electrically driven.
- the housing formed by filling the molding space with resin has an integral cylindrical shape and is provided on a predetermined outer surface to communicate the inside and outside of the housing.
- the second rib is arranged at a position in the penetrating direction on the inner side of the /ribs from the first rib, and the longitudinal direction of the second rib is the first rib. It is not parallel to the contacting/separating direction of the first and second cavity portions and the fitting direction of the core portion.
- Fig. 1 is a schematic first embodiment of a method for molding an electric working machine and a housing thereof according to the present invention, wherein (8) is a plane cross section showing a housing and a molding die having an integral tubular shape.
- the housing is a cross-sectional view of (Mimi) 8_8 ⁇ , (Mimi) is a side view of the ventilation port provided in the housing as seen from the outside of the housing, and ( ⁇ ) is ( 8) No. 1 _ No. 1 side cross-section, (0) No. (8) No. 2 _ No. 2 side cross-section, (No.) is (8) No. 10 cross-section, () is the appearance of the housing Explanatory drawing to show.
- FIG. 2 is a side sectional view of a hammer drill as an electric working machine according to the second embodiment of the present invention.
- FIG. 3 An enlarged side view of a main part having a ventilation hole of a housing in the second embodiment.
- FIG. 4 A main part of the second embodiment, wherein (8) is a half cross-sectional view of FIG. 3 and is a half cross-sectional view showing a molding die together.
- FIG. 5 A main part of the second embodiment, wherein (8) is a 8 2 — 8 2 half cross-sectional view of FIG. 3, and (M) is a 2 — 2 half cross-sectional view showing a molding die together. ⁇ 2020/175006 6 ⁇ (:171? 2020/003662 Perspective view.
- FIG. 7 A main part of the second embodiment, in which (8) is a sectional view taken along the side of 1-Minami 1 of FIG. 4 (8), and (Mi) is a drawing of FIG. 1 _ Sumi 1 side sectional view.
- FIG. 8 A main part of the second embodiment, in which (8) is a sectional view taken along the line 2-2 in FIG. 4(8), and (()) is also shown in FIG. 2 _ Sumi 2 side sectional view.
- FIG. 9 A main part of the second embodiment, wherein (8) is a cross section taken along the line 10 (10) in FIG. 3, and (M) is a cross section taken along line (3 — 0) in FIG.
- FIG. 10 is a left side view showing a third embodiment of the present invention, in which a portion including a handle portion of a housing having an integral tubular shape is divided into two parts.
- Fig. 11 is an exploded perspective view from the left showing a configuration in which the portion including the handle portion of the cylindrical housing is divided into two.
- FIG. 12 is a right side view of the third embodiment, showing a configuration in which a portion including a handle portion of a cylindrical housing is divided into two.
- FIG. 13 An exploded perspective view from the right showing a structure in which a portion including a handle portion of a housing having the same tubular shape is divided into two.
- FIG. 14 A schematic comparative example of a method for molding an electric working machine and its housing, wherein (8) is a horizontal cross-sectional view showing the housing and the molding die, and the housing is a (8)-8 cross-sectional view of (Mimi).
- ⁇ (M) is a side view of the ventilation port provided in the cylindrical housing as seen from the outside of the housing as viewed from the radial direction
- ( ⁇ ) is a cross-sectional view of the (M) side of (8)
- (0) is ( (8) Cross-sectional view along line XX
- (M) is an explanatory view showing the appearance of the housing.
- Figs. 1 () to () are molding of an electric working machine and a housing thereof according to the present invention. ⁇ 2020/175006 7 ⁇ (:171? 2020/003662
- the dust-proof is provided on the side surface of the housing 10 of the electric operating machine that has the cylindrical portion 103 that has the shape of a cylindrical body and that houses the motor inside the cylindrical portion 103.
- an outer rib 12 as a first rib and an inner rib 13 as a second rib are provided to provide a ventilation port 11 having a so-called laplin structure.
- the vent 11 communicates with the inside and outside of the housing, and functions as a wind window for intake or exhaust of air that cools the motor inside the tubular portion 103.
- the outer ribs 12 and the inner ribs 13 provided in the vent hole 11 have a penetrating direction that penetrates the inside and the outside of the housing 10 (specifically, the cylindrical portion 10). (3 radial direction), the inner rib 13 is arranged inside the outer rib 12 so that the outer rib 1 2 and the inner rib 1 3 do not overlap each other when viewed in the radial direction. ..
- the outer ribs 12 and the inner ribs 13 are inclined with respect to the axial direction of the tubular portion 103 of the housing 10 (parallel to the X direction which is the moving direction of the core portion 10 3 described later). Are formed (non-parallel).
- the first and second cavity parts 10 1, 10 2 which can be contacted and separated from each other, and the first and second cavity parts 10 1, which are in a joined state.
- the molding die 100 having the core portion 10 3 which can be fitted into the concave portion formed by 10 2, the outer ribs 12 and the tubular portion 10 provided in the vent hole 11 of the housing 10 are used.
- the inner rib 13 which is arranged so as not to overlap the outer rib 12 when viewed in the penetration direction of 3 (specifically, in the radial direction) is molded at one time.
- the first cavity portion 10 1 and the second cavity portion 10 2 are capable of reciprocating movement in the vertical direction
- the core portion 10 3 is capable of reciprocating in the X direction orthogonal to the vertical direction
- the three members are joined.
- fill the molding space of the housing 10 with resin and mold (for example, injection molding).
- the outer ribs 12 provided on the ventilation holes 11 are, as shown in Fig. 1 (Mimi), located on the sides of the housing on both sides of the outer ribs 1 2 on both sides of the first and second cavity portions 1 0 1, 1 0 2 Convex part of This is done by forming a rectangular slit-shaped opening 15 shown in Figs. 1 (M) and () by 10 2 3.
- the inner ribs 13 provided on the vent 11 are located inside the side surface of the housing 10 (cylindrical portion). ⁇ 2020/175006 8 ⁇ (:171? 2020/003662
- the core 1033 is provided with a recess 1033 that will become the inner rib 13.
- the outer ribs 12 and the inner ribs 13 are arranged so that they do not necessarily overlap with each other when viewed in the radial direction of the tubular portion 103. Also inside ribs
- the first and second cavity parts 10 1 and 10 2 are moved in a direction in which they are separated from each other in the upward direction, and die-cutting is performed.
- the width dimension of the outer ribs 12 that are orthogonal to the X direction and the ridge direction is set so as to face the outer radial direction of the cylindrical shape of the housing 10 due to the draft. It has become smaller (substantially the same as the comparative example in Fig. 14).
- the core portion 103 is moved in the cutting direction in the X direction inclined with respect to the longitudinal direction of the inner ribs 13 to perform die cutting.
- the inner rib 13 is provided with a draft for smooth die cutting, but the reference surface 1 3 3 for drafting is the surface exposed to the outside of the housing of the inner rib 13 and the reference surface With 1 3 3 as the starting point of the draft, apply the required draft to the side surface 1 3 of the inner rib 1 3 along the longitudinal direction of the reference plane 1 3 3 .
- the longitudinal direction of the inner rib 13 is as shown in Fig.
- Fig. 1 ( ⁇ ) and (0) As shown in Fig. 1 (Mimi), the width dimension of the inner rib 13 perpendicular to the X and direction is smaller toward the inner side in the radial direction of the tubular shape. As a result, the side surface 1 3 along the longitudinal direction of the reference surface 1 3 3 of the inner rib 13 is formed as an inclined surface. Therefore, when the inner rib 13 is viewed from the radial direction of the cylinder, it is shown in Fig. 1 ( ⁇ ), ⁇ 2020/175006 9 ⁇ (:171? 2020/003662
- the widthwise dimension of the outer surface (reference surface 1 3 3) of the inner rib 13 which is orthogonal to the X direction and the vertical direction is constant (or substantially constant) along the longitudinal direction of the inner rib 13. It is possible to In other words, the width of the inner rib 13 seen from each slit-shaped opening 15 that is the outer opening of the ventilation hole 11 can be made constant (or approximately constant), as shown in Fig. 1 (Mitsumi) and (). In addition, each slit-shaped opening 15 can be made into an elongated rectangle in consideration of dust resistance.
- the plurality of ribs include an outer rib 12 and an inner rib 13 which penetrate the inside and the outside of the housing and have different positions in the penetration direction, and the outer rib 1 2
- the inner rib 13 and the inner rib 13 have a labyrinth structure integrally formed so that they do not overlap with each other on the predetermined outer surface when viewed in the penetration direction.
- the outer rib 1 2 and the inner rib 13 are arranged so as not to overlap with each other when viewed in the penetrating direction, as shown in Fig. 1 (Mimi), the first or second cavity portion 1 0 1, 1 0 2 and the core portion
- the outer ribs 12 and the inner ribs 13 can be integrally formed by alternately projecting 10 3 and 10 3 in the penetrating direction.
- the width of the inner rib 13 as viewed in the radial direction (X, the width dimension in the direction orthogonal to the vertical direction) can be made substantially constant.
- the slit-shaped openings 15 on both sides of the outer ribs 12 should be ⁇ 2020/175006 10 ⁇ (:171? 2020/003662
- a rectangle with a width slightly larger than the width can be used to improve dust resistance.
- the molding die 100 for molding the housing 10 is composed of the first and second cavity parts 1 0 1 and 10 2 and the first and second cavity parts 1 0 in the joined state.
- This is a structure having a core portion 10 3 which can be fitted into 1 and 10 2, and does not require a special structure.
- the longitudinal direction of the inner rib 13 is set to be non-parallel to the contact and separation direction of the first and second cavity parts 10 1 and 10 2 and the fitting direction of the core part 10 3, It is no longer necessary to provide a draft in the longitudinal direction of the inner rib 13.
- the width of the inner rib 13 in the radial direction can be made substantially constant.
- the hammer drill 1 applies a rotating force and a striking force to a tip tool (not shown) held by the tool holding unit 3 to perform scraping work, drilling work, and scraping work on work materials such as concrete and stone. Crushing work can be performed.
- the outer shell of the hammer drill 1 is composed of a housing 10 and a gear case 30.
- the housing 10 is a resin molded body.
- the gear case 30 is made of metal such as aluminum.
- a side handle 3 1 is provided on the gear case 30.
- the housing 10 has a tubular portion 103 having an integral tubular shape that serves as a motor housing portion for housing the motor 2 and the like, and a handle portion 10 for gripping by an operator.
- a trigger switch 5 is provided on the upper end of the handle 10 to allow the operator to instruct the motor 2 to drive or stop.
- the gear case 30 accommodates a power transmission mechanism 4 that transmits the rotation of the motor 2 and drives (rotates and strikes) the tip tool held by the tool holder 3. Since the structure of the power transmission mechanism 4 is well known, its details are omitted.
- FIG. 3 is a main part of the second embodiment.
- the vent 11 is a cylinder that is a part for housing the motor 2. ⁇ 2020/175006 1 1 ⁇ (:171? 2020/003662
- a plurality of slit-shaped openings 15 each having a substantially rectangular shape (having a substantially constant width), which are arranged closer to the handle portion 1013 than the shape portion 103, the outer ribs 12 formed between them, and the tube.
- the shape portion 103 has an inner rib 13 located inside the outer rib 12 in the radial direction. Further, the outer ribs 12 and the inner ribs 13 do not overlap each other when viewed in the radial direction, and the inner ribs 13 are visible from the slit-shaped openings 15. As a result, the vent 11 has a labyrinth structure.
- Fig. 4 (eight) is a 8 1 -8 1 half cross-sectional view of Fig. 3, (m) is an 8 1 _ 8 1 half cross-sectional view showing the molding die together, and Fig. 5 (eight) is the eight 1- 2-8 2 and a half sectional view, (M) shows 8 2 _ 8 2 and a half sectional view together with the molding die It is a perspective view.
- the inner ribs As you can see from these figures, the inner ribs
- a gap 16 is formed between the outer rib 12 and the inner rib 13 located radially inward of the outer rib 12 as an air passage communicating with the slit-shaped opening 15.
- Fig. 7 is a sectional view taken along the line 1-Min 1 of Fig. 4 (eight)
- (Min) is a sectional view showing the forming die together, and is shown in Fig. 4 (8).
- Fig. 8 is a sectional view taken along the side of Min 2__Min 2 in Fig. 4(8)
- (Min) is a sectional view showing the forming mold together with Fig. 4() It is a half cross-sectional view, and each inner rib 13 is formed with a draft in a drawing direction of a core part 103 which is parallel to an axial direction of the tubular part 103.
- the operation and effect of the second embodiment is similar to that of the schematic first embodiment, and is a housing 10 having a tubular portion 10 3 forming an integral tubular shape like a hammer drill 1.
- the labyrinth structure vent 11 with excellent dust resistance can be manufactured without using a special mold.
- Figs. 10 to 13 show Embodiment 3 in which the present invention is applied to a hammer drill as an electric working machine, in which the outer shell portion of the hammer drill 1 is a tubular portion that forms an integral tubular shape.
- the housing 10 has a structure in which a portion including the handle portion 10 is divided into two parts.
- Fig. 10 is a left side view showing a structure in which the part of the housing 10 including the handle portion 10 is divided into two parts.
- Fig. 11 is an exploded perspective view of the same from the left side.
- Fig. 12 is a right side view of the same.
- 13 is an exploded perspective view seen from the right side.
- the housing 10 has a tubular portion that forms an integral tubular shape.
- the outer ribs 12, inner ribs 13, slit-shaped openings 15 and the like provided in the vent hole 11 on one side (right side) of the housing 20 have the same configuration as in the second embodiment described above. It is molded at the same time with the same mold.
- the other (left) vent 11 is formed on the side of the housing 20 and the outer rib 12 and the slit-shaped opening 15 formed on the housing 21 which is another molded body. It has a labyrinth structure in combination with the inner ribs 13.
- one housing portion 20 integrally has a tubular portion 1033 for accommodating a motor and half of the handle portion 10 s, the strength of the handle 10 s Can be increased.
- the hammer drill is exemplified as the electric working machine. ⁇ 2020/175006 13 ⁇ (:171? 2020/003662
- housings that have an integral tubular shape, such as grinders, dust collectors, and mowers.
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Abstract
The present invention prevents entry of foreign matter into a housing while keeping durability around a vent provided in the housing. An electric work machine is provided with a housing (10) that has an integral cylindrical shape and stores a motor inside the housing; a vent (11) that is provided in a predetermined outer surface of the housing and communicates the inside and outside of the housing; and a plurality of ribs provided in the vent (11). The plurality of ribs include an outer rib (12) and an inner rib (13) at different locations in a penetration direction penetrating the inside and outside of the housing. The outer rib (12) and the inner rib (13) are arranged not to overlap with each other in the penetration direction when viewed from the predetermined outer surface.
Description
\¥0 2020/175006 1 卩(:17 2020 /003662 明 細 書 \¥0 2020/175006 1 卩 (: 17 2020 /003662 Clarification
発明の名称 : 電動作業機及びそのハウジングの成形方法 Title of invention: Electric working machine and method for molding housing thereof
技術分野 Technical field
[0001 ] 本発明は、 ハウジング内にモータを内蔵した電動作業機及びそのハウジング の成形方法に関する。 The present invention relates to an electric working machine in which a motor is built in a housing and a method for molding the housing.
背景技術 Background technology
[0002] —般に、 下記特許文献 1 に示すようなハウジング内にモータを内蔵した電動 工具等にあっては、 モータの冷却のための風窓となる通気口をハウジングに 設けているが、 通気口から粉塵や水滴等の異物が侵入することを抑制するこ とが望まれていた。 [0002] Generally, in an electric tool or the like in which a motor is built in a housing as shown in Patent Document 1 below, the housing is provided with a vent hole serving as a wind window for cooling the motor. It was desired to prevent foreign matter such as dust and water droplets from entering through the mouth.
[0003] 電動作業機のハウジングが左右二分割された構造の場合、 分割されたハウジ ングの成形型のキヤビティ部とこれに嵌入するコア部の抜き方向は正反対と なる。 このため、 防塵性に配慮して通気口にリブを設ける場合、 リブをコア 部の抜き方向に対してほぼ垂直に配置することで、 抜き勾配の制約を受ける 距離が短く、 任意の通気口形状が可能であった。 [0003] In the case where the housing of the electric working machine has a structure in which the housing is divided into two parts on the left and right sides, the direction of extraction of the cavity part of the divided molding die and the core part fitted therein is opposite to each other. Therefore, in the case of providing a rib on the vent hole in consideration of dustproofness, by arranging the rib almost perpendicular to the extraction direction of the core part, the distance restricted by the draft angle is short and the desired vent shape Was possible.
[0004] しかし、 キヤビティ部とコア部で抜き方向が 9 0度異なる筒形状を有するハ ウジングを成形する場合、 キヤビティ部の抜き方向に対して垂直に通気口の リブを配置すると、 コア部の抜き方向に対しては平行となるため、 抜き勾配 の制約を受ける距離が長くなり、 リブが細くなりすぎる、 又は通気口の外面 の開口が広くなり防塵性が損なわれる。 このことを以下の図 1 4の比較例で 説明する。 [0004] However, when molding a housing having a tubular shape in which the withdrawal direction differs by 90 degrees between the cavity portion and the core portion, if the rib of the vent hole is arranged perpendicularly to the withdrawal direction of the cavity portion, the core portion Since it is parallel to the pulling direction, the distance subject to the draft angle becomes longer, the rib becomes too thin, or the opening on the outer surface of the vent becomes wider, and the dustproof property is impaired. This is illustrated in the comparative example in Figure 14 below.
[0005] 図 1 4 (八) 〜 (巳) は防塵性を高めるためにハウジング 2 0 0の通気口 2 [0005] Fig. 14 (8) to (M) show the ventilation holes 2 of the housing 200 to enhance the dustproof property.
0 1 に外側リブ 2 0 2と内側リブ 2 0 3を設けてラビリンス構造とした電動 作業機及びそのハウジング 2 0 0の成形方法の模式的な比較例であって、 ( 八) はハウジング 2 0 0及び成形型を示す平断面図、 ハウジングは (巳) の 八_八断面図となっている} 、 (巳) はハウジング 2 0 0の外側から見た、 ハウジング側面に設けられた通気口 2 0 1の径方向視による側面図、 (〇)
〇 2020/175006 2 卩(:171? 2020 /003662 This is a schematic comparative example of a method of forming an electric working machine having a labyrinth structure by providing an outer rib 20 2 and an inner rib 20 3 on 0 1 and a method of molding the housing 20 0, where (8) is the housing 20 0 and a plan sectional view showing the molding die, the housing is an 8-8 sectional view of (Mitsumi)}, and (Mimi) is a ventilation port provided on the side surface of the housing 2 when viewed from the outside of the housing 200 Side view from the radial view of 0 1, (○) 〇 2020/175006 2 卩 (:171? 2020 /003662
は (八)
側断面図、 (0) は (八) の〇_〇断面図、 (巳) はハウ ジング 2 0 0の外観を示す説明図である。 この比較例では、 筒形状を有し、 内部にモータを収容するハウジング 2 0 0の側面に通気口 2 0 1 を設けてい るが、 通気口 2 0 1 に設けられた外側リブ 2 0 2及び内側リブ 2 0 3はハウ ジング 2 0 0の筒形状部 2 0 0 3の軸方向と平行にそれぞれ形成される。 こ のようなハウジング 2 0 0を成形する場合、 相互に接離可能な第 1及び第 2 キヤビティ部 3 0 1 , 3 0 2と、 接合状態の第 1及び第 2キヤビティ部 3 0 1 , 3 0 2に嵌入可能なコア部 3 0 3とを有する成形型 3 0 0を用いて、 ハ ウジング 2 0 0の通気口 2 0 1 に設けられる外側リブ 2 0 2及びこれと重な らない配置の内側リブ 2 0 3を一度に成形することが考慮されている。 Ha (eight) A side cross-sectional view, (0) is a cross-sectional view taken along line XX of (8), and (M) is an explanatory view showing the appearance of the housing 200. In this comparative example, the ventilation hole 20 1 is provided on the side surface of the housing 200 0 that has a cylindrical shape and houses the motor, but the outer ribs 20 2 provided on the ventilation hole 20 1 The inner ribs 203 are formed in parallel with the axial direction of the tubular portion 203 of the housing 200. When molding such a housing 200, the first and second cavity parts 3 01 and 30 2 which can be contacted and separated from each other and the first and second cavity parts 3 0 1 and 3 in the joined state are formed. Using a molding die 300 having a core portion 300 that can be fitted into the outer casing 202, and an outer rib 202 provided in the ventilation hole 201 of the housing 200 and an arrangement that does not overlap the outer rib 202. It is considered to mold the inner ribs 203 of the at one time.
[0006] この場合、 第 1キヤビティ部 3 0 1及び第 2キヤビティ部 3 0 2は丫方向、 コア部 3 0 3は丫方向に直交する X方向に往復移動可能であり、 三者が接合 した状態にてハウジング 2 0 0の成形空間に樹脂を充填して成形する (例え ば射出成形) 。 通気口 2 0 1 に設けられる外側リブ 2 0 2は、 図 1 4 (0) に示すようにハウジング側面において外側リブ 2 0 2となる部分の両側に第 1及び第 2キヤビティ部 3 0 1 , 3 0 2の凸部
3 0 2 3によって スリツ ト状開口 2 0 5を形成することで行う。 通気口 2 0 1 に設けられる内 側リブ 2 0 3は、 ハウジング 2 0 0の側面の内側において、 内側リブ 2 0 3 となる凹部 3 0 3 3をコア部 3 0 3に設けることで形成する。 [0006] In this case, the first cavity portion 301 and the second cavity portion 302 are reciprocally movable in the vertical direction, and the core portion 303 is reciprocally movable in the X direction orthogonal to the vertical direction, and the three members are joined. In this state, the molding space of the housing 200 is filled with resin for molding (eg injection molding). As shown in Fig. 14 (0), the outer ribs 20 2 provided on the air vents 20 1 have the first and second cavity portions 3 0 1, on both sides of the outer rib 20 2 on the side surface of the housing. 3 0 2 convex part It is performed by forming slit-shaped openings 205 by means of 302. The inner side ribs 203 provided in the ventilation hole 201 are formed by providing the core portion 303 with a recessed portion 303 which becomes the inner rib 203 inside the side surface of the housing 200. ..
[0007] 樹脂が固化した成形品のハウジング 2 0 0の型抜きは、 第 1キヤビティ部 3 [0007] The die-cutting of the housing 200 of the molded product in which the resin is solidified is performed using the first cavity portion 3
0 1及び第 2キヤビティ部 3 0 2を互いに離間する方向に、 コア部 3 0 3を 丫方向に直交する X方向の引き抜き方向に移動させることで行う。 0 1 and the second cavity portion 30 2 are separated from each other by moving the core portion 30 3 in the pull-out direction of the X direction orthogonal to the vertical direction.
[0008] 外側リブ 2 0 2については、 第 1キヤビティ部 3 0 1及び第 2キヤビティ部 [0008] Regarding the outer ribs 202, the first cavity portion 301 and the second cavity portion are
3 0 2を丫方向で相互に離間する向き移動させて型抜きする。 型抜きを円滑 に行うため、 図 1 4 (0) のように X方向及び丫方向に直交する外側リブ 2 0 2の幅方向寸法は、 抜き勾配によりハウジング 2 0 0の筒形状の径方向外 側に向かって小さくなっている。 The die is moved by moving 3 02 in the direction of the bird's eye so that they are separated from each other. In order to smoothly perform die cutting, as shown in Fig. 14 (0), the width dimension of the outer rib 202 that is orthogonal to the X direction and the vertical direction is determined by the draft angle so that the outer diameter of the tubular shape of the housing 200 is outside the radial direction. It is getting smaller toward the side.
[0009] 一方、 内側リブ 2 0 3については、 コア部 3 0 3を内側リブ 2 0 3の長手方
〇 2020/175006 3 卩(:171? 2020 /003662 [0009] On the other hand, regarding the inner ribs 203, the core portion 303 is arranged in the longitudinal direction of the inner ribs 203. 〇 2020/175006 3 卩 (:171? 2020 /003662
向である X方向に移動させて型抜きする。 型抜きを円滑に行うため、 図 1 4 (〇) のように X方向及び丫方向に直交する内側リブ 2 0 3の幅方向寸法は 、 抜き勾配により、 ハウジング 2 0 0の筒形状の軸方向 (X方向) において コア部 3 0 3の抜き方向に向かって小さくならざるを得ない (先細形状とな る) 。 従って、 通気口 2 0 1の外側開口となる各スリッ ト状開口 2 0 5は、 内側リブ 2 0 3の幅に対応して、 図 1 4 (º) に示すように、 同図の右端で 開口幅が大きく、 コア部 3 0 3の抜き方向に向かって開口幅が小さくなる。 このように、 内側リブ 2 0 3の長手方向に沿って抜き勾配を設ける必要があ るため、 抜き勾配による内側リブ 2 0 3の幅変化が無視できなくなり、 図 1 4 (巳) のような先細の内側リブ 2 0 3及びスリッ ト状開口 2 0 5を有する 通気口 2 0 1 となってしまう。 Move in the X direction, which is the direction, and perform die cutting. In order to facilitate the die-cutting, as shown in Fig. 14 (○), the widthwise dimension of the inner ribs 203 that are orthogonal to the X-direction and the hull-direction is due to the draft angle. In the (X direction), there is no choice but to decrease in the pulling direction of the core portion 303 (it becomes a tapered shape). Therefore, each slit-shaped opening 205 that is the outer opening of the ventilation hole 201 corresponds to the width of the inner rib 203, as shown in Fig. 14 (º). The opening width is large, and the opening width becomes smaller in the pulling direction of the core portion 303. In this way, since it is necessary to provide a draft along the longitudinal direction of the inner rib 203, the width change of the inner rib 203 due to the draft cannot be ignored, and as shown in Fig. 14 (Mimi). This results in a vent 2 01 with a tapered inner rib 203 and a slit-like opening 205.
先行技術文献 Prior art documents
特許文献 Patent literature
[0010] 特許文献 1 :特開 2 0 1 8 _ 1 8 7 7 0 1号公報 [0010] Patent Document 1: Japanese Patent Laid-Open No. 2 0 1 8 _ 1 8 7 7 0 1
発明の概要 Summary of the invention
発明が解決しようとする課題 Problems to be Solved by the Invention
[001 1 ] 上述したように、 風窓となる通気口に設ける外側リブ及び内側リブの配置に 工夫がない比較例の場合、 電動作業機の筒形状を有するハウジングの側面方 向視において、 各リブが細長い台形形状となってしまうため、 ハウジング外 面におけるスリッ ト状開口の幅寸法が大型化して異物の侵入を抑制できなく なってしまったり、 スリッ ト状開口の幅寸法を小さく しようとすると各リブ が薄くなって強度が低下する虞があった。 [001 1] As described above, in the case of the comparative example in which the arrangement of the outer ribs and the inner ribs provided in the ventilation hole that serves as the wind window is not devised, each rib is viewed in the side view of the housing having the tubular shape of the electric working machine. Becomes a slender trapezoidal shape, the width dimension of the slit-shaped opening on the outer surface of the housing becomes large and it becomes impossible to suppress the intrusion of foreign matter, or if the width dimension of the slit-shaped opening is reduced, There was a risk that the ribs would become thin and the strength would decrease.
[0012] 本発明はこうした状況を認識してなされたものであり、 その目的は、 ハウジ ングに設ける通気口の周辺の耐久性を維持しながら、 ハウジング内への異物 の侵入を抑制可能な電動作業機及びそのハウジングの成形方法を提供するこ とにある。 [0012] The present invention has been made in view of such a situation, and an object thereof is an electric motor capable of suppressing the intrusion of foreign matter into the housing while maintaining the durability around the ventilation port provided in the housing. Another object of the present invention is to provide a method for forming a working machine and its housing.
課題を解決するための手段
〇 2020/175006 4 卩(:171? 2020 /003662 Means for solving the problem 〇 2020/175006 4 boxes (:171? 2020/003662
[0013] 本発明の第 1の態様は電動作業機である。 この電動作業機は、 モータと、 一 体の筒形状を有し、 内部に前記モータを収容するハウジングと、 前記ハウジ ングの所定外面に設けられて前記ハウジング内外を連通する通気口と、 前記 通気口に設けられる複数のリブと、 を備え、 前記複数のリブは、 前記ハウジ ング内外を貫通する貫通方向における位置が異なる第 1のリブと第 2のリブ とを含み、 前記第 1のリブと前記第 2のリブとは前記所定外面での前記貫通 方向視において重ならない部分を有するように一体に成形されている。 A first aspect of the present invention is an electric working machine. The electric working machine has a motor and a single tubular shape, and a housing for housing the motor therein, a ventilation hole provided on a predetermined outer surface of the housing for communicating the inside and outside of the housing, and the ventilation. A plurality of ribs provided in the mouth, wherein the plurality of ribs include a first rib and a second rib that are different in position in a penetrating direction penetrating the inside and the outside of the housing, and the first rib and The second rib is integrally molded so as to have a portion that does not overlap with the predetermined outer surface when viewed in the penetrating direction.
[0014] 前記通気口は、 前記ハウジングの側面に設けられ、 前記貫通方向としての前 記筒形状の径方向に沿って前記ハウジング内外を連通しており、 前記第 1の リブと前記第 2のリブは、 前記径方向における位置が異なり、 かつ前記径方 向視において重ならない配置であるとよい。 The ventilation port is provided on a side surface of the housing, communicates with the inside and outside of the housing along a radial direction of the tubular shape as the penetration direction, and the first rib and the second rib. It is preferable that the ribs have different positions in the radial direction and do not overlap in the radial direction.
[0015] 前記第 2のリブの長手方向が、 前記筒形状の軸方向及び前記径方向に対して 非平行であるとよい。 [0015] The longitudinal direction of the second rib may be non-parallel to the axial direction and the radial direction of the tubular shape.
[0016] 前記第 2のリブは、 前記貫通方向における位置が前記第 1のリブよりも内側 に配置され、 前記所定外面での前記貫通方向視における前記第 2のリブの幅 が、 前記貫通方向内側に向けて小さくなるように、 前記第 2のリブの長手方 向に沿った側面が前記貫通方向に対して傾斜するように形成されているとよ い。 The position of the second rib in the penetrating direction is arranged inside the first rib, and the width of the second rib in the penetrating direction viewed on the predetermined outer surface is the penetrating direction. It is said that the side surface along the longitudinal direction of the second rib is formed so as to be inclined with respect to the penetrating direction so as to become smaller toward the inside.
[0017] 前記第 2のリブは、 前記所定外面での前記貫通方向視における幅方向の寸法 が、 前記長手方向において略一定であるとよい。 [0017] It is preferable that the second rib has a widthwise dimension of the predetermined outer surface as viewed in the penetrating direction that is substantially constant in the longitudinal direction.
[0018] 前記第 1のリブ及び前記第 2のリブは、 それぞれ複数設けられるとよい。 [0018] A plurality of the first ribs and a plurality of the second ribs are preferably provided.
[0019] 本発明の第 2の態様は電動作業機のハウジングの成形方法である。 この電動 作業機のハウジングの成形方法は、 相互に接離可能な第 1及び第 2キヤビテ ィ部と、 接合状態の前記第 1及び第 2キヤビティ部に嵌入可能なコア部と、 を用いて電動作業機のハウジングの成形空間を構成する場合において、 前記 成形空間内への樹脂充填で形成される前記ハウジングは、 一体の筒形状を有 するとともに、 所定外面に設けられて前記ハウジング内外を連通する通気口 と、 前記通気口に設けられる複数のリブと、 を有し、 前記複数のリブは、 前
〇 2020/175006 5 卩(:171? 2020 /003662 A second aspect of the present invention is a method for molding a housing of an electric working machine. The method of molding the housing of the electric working machine is such that the first and second cavities that can be brought into contact with and separated from each other and the core that can be fitted into the first and second cavities in the joined state are electrically driven. In the case of forming the molding space of the housing of the working machine, the housing formed by filling the molding space with resin has an integral cylindrical shape and is provided on a predetermined outer surface to communicate the inside and outside of the housing. A vent and a plurality of ribs provided on the vent, wherein the plurality of ribs are 〇 2020/175006 5 卩(: 171-1? 2020/003662
記ハウジング内外を貫通する貫通方向における位置が異なる第 1のリブと第 2のリブとを含み、 前記第 1のリブと前記第 2のリブとは前記所定外面での 前記貫通方向視において重ならない部分を有する配置であり、 前記第 2のリ ブは、 前記貫通方向における位置が前記第 1のリブよりも前記/ヽウジングの 内側に配置され、 かつ前記第 2のリブの長手方向が前記第 1及び第 2キャビ ティ部の接離方向及び前記コァ部の嵌入方向に対して非平行である。 It includes a first rib and a second rib that penetrate the inside and outside of the housing at different positions in the penetrating direction, and the first rib and the second rib do not overlap with each other in the penetrating direction on the predetermined outer surface. The second rib is arranged at a position in the penetrating direction on the inner side of the /ribs from the first rib, and the longitudinal direction of the second rib is the first rib. It is not parallel to the contacting/separating direction of the first and second cavity portions and the fitting direction of the core portion.
[0020] なお、 以上の構成要素の任意の組合せ、 本発明の表現を方法やシステム等の 間で変換したものもまた、 本発明の態様として有効である。 [0020] It should be noted that any combination of the above constituent elements and one obtained by converting the expression of the present invention between methods and systems are also effective as an aspect of the present invention.
発明の効果 Effect of the invention
[0021] 本発明によれば、 電動作業機のハウジングに設ける通気口の周辺の耐久性を 維持し、 かつハウジング内への異物の侵入を効果的に抑制可能であり、 防塵 性を向上させることができる。 [0021] According to the present invention, it is possible to maintain the durability around the vent hole provided in the housing of the electric working machine, effectively suppress the intrusion of foreign matter into the housing, and improve the dustproof property. You can
図面の簡単な説明 Brief description of the drawings
[0022] [図 1]本発明に係る電動作業機及びそのハウジングの成形方法の模式的な実施 の形態 1であって、 (八) は一体の筒形状を有するハウジング及び成形型を 示す平断面図、 ハウジングは (巳) の八_八断面図である} 、 (巳) はハウ ジングの外側から見た、 ハウジングに設けられた通気口の径方向視による側 面図、 (〇) は (八) の巳 1 _巳 1側断面図、 (0) は (八) の巳 2 _巳 2 側断面図、 (巳) は (八) の〇一〇断面図、 ( ) はハウジングの外観を示 す説明図。 [0022] [Fig. 1] Fig. 1 is a schematic first embodiment of a method for molding an electric working machine and a housing thereof according to the present invention, wherein (8) is a plane cross section showing a housing and a molding die having an integral tubular shape. Figure, The housing is a cross-sectional view of (Mimi) 8_8}, (Mimi) is a side view of the ventilation port provided in the housing as seen from the outside of the housing, and (○) is ( 8) No. 1 _ No. 1 side cross-section, (0) No. (8) No. 2 _ No. 2 side cross-section, (No.) is (8) No. 10 cross-section, () is the appearance of the housing Explanatory drawing to show.
[図 2]本発明の実施の形態 2であって、 電動作業機としてのハンマドリルの側 断面図。 FIG. 2 is a side sectional view of a hammer drill as an electric working machine according to the second embodiment of the present invention.
[図 3]実施の形態 2において、 ハウジングの通気口を有する要部の拡大側面図 [FIG. 3] An enlarged side view of a main part having a ventilation hole of a housing in the second embodiment.
[図 4]実施の形態 2の要部であって、 (八) は図 3の八 1 _八 1半断面図、 ( B) は成形型を併せて示す 半断面図。 [FIG. 4] A main part of the second embodiment, wherein (8) is a half cross-sectional view of FIG. 3 and is a half cross-sectional view showing a molding die together.
[図 5]実施の形態 2の要部であって、 (八) は図 3の八 2 _八 2半断面図、 ( 巳) は成形型を併せて示す 2 _ 2半断面図。
〇 2020/175006 6 卩(:171? 2020 /003662
斜視図。 [FIG. 5] A main part of the second embodiment, wherein (8) is a 8 2 — 8 2 half cross-sectional view of FIG. 3, and (M) is a 2 — 2 half cross-sectional view showing a molding die together. 〇 2020/175006 6 卩(:171? 2020/003662 Perspective view.
[図 7]実施の形態 2の要部であって、 (八) は図 4 (八) の巳 1 -巳 1側断面 図、 (巳) は成形型を併せて示す図 4 ( ) の巳 1 _巳 1側断面図。 [FIG. 7] A main part of the second embodiment, in which (8) is a sectional view taken along the side of 1-Minami 1 of FIG. 4 (8), and (Mi) is a drawing of FIG. 1 _ Sumi 1 side sectional view.
[図 8]実施の形態 2の要部であって、 (八) は図 4 (八) の巳 2 -巳 2側断面 図、 (巳) は成形型を併せて示す図 4 ( ) の巳 2 _巳 2側断面図。 [FIG. 8] A main part of the second embodiment, in which (8) is a sectional view taken along the line 2-2 in FIG. 4(8), and (()) is also shown in FIG. 2 _ Sumi 2 side sectional view.
[図 9]実施の形態 2の要部であって、 (八) は図 3の〇一〇半断面図、 (巳) は成形型を併せて示す図 3の(3 _ 0半断面図。 [FIG. 9] A main part of the second embodiment, wherein (8) is a cross section taken along the line 10 (10) in FIG. 3, and (M) is a cross section taken along line (3 — 0) in FIG.
[図 10]本発明の実施の形態 3であって、 一体の筒形状を有するハウジングの ハンドル部を含む部分を 2分割した構成を示す左側面図。 FIG. 10 is a left side view showing a third embodiment of the present invention, in which a portion including a handle portion of a housing having an integral tubular shape is divided into two parts.
[図 1 1]同じく筒形状を有するハウジングのハンドル部を含む部分を 2分割し た構成を示す左方からみた分解斜視図。 [Fig. 11] Fig. 11 is an exploded perspective view from the left showing a configuration in which the portion including the handle portion of the cylindrical housing is divided into two.
[図 12]実施の形態 3であって、 筒形状を有するハウジングのハンドル部を含 む部分を 2分割した構成を示す右側面図。 FIG. 12 is a right side view of the third embodiment, showing a configuration in which a portion including a handle portion of a cylindrical housing is divided into two.
[図 13]同じく筒形状を有するハウジングのハンドル部を含む部分を 2分割し た構成を示す右方からみた分解斜視図。 [FIG. 13] An exploded perspective view from the right showing a structure in which a portion including a handle portion of a housing having the same tubular shape is divided into two.
[図 14]電動作業機及びそのハウジングの成形方法の模式的な比較例であって 、 (八) はハウジング及び成形型を示す平断面図、 ハウジングは (巳) の八 _八断面図である} 、 (巳) はハウジングの外側から見た、 筒形状を有する ハウジングに設けられた通気口の径方向視による側面図、 (〇) は (八) の 巳側断面図、 (0) は (八) の〇_〇断面図、 (巳) はハウジングの外 観を示す説明図。 [FIG. 14] A schematic comparative example of a method for molding an electric working machine and its housing, wherein (8) is a horizontal cross-sectional view showing the housing and the molding die, and the housing is a (8)-8 cross-sectional view of (Mimi). }, (M) is a side view of the ventilation port provided in the cylindrical housing as seen from the outside of the housing as viewed from the radial direction, (○) is a cross-sectional view of the (M) side of (8), and (0) is ( (8) Cross-sectional view along line XX, and (M) is an explanatory view showing the appearance of the housing.
発明を実施するための形態 MODE FOR CARRYING OUT THE INVENTION
[0023] 以下、 図面を参照しながら本発明の好適な実施の形態を詳述する。 なお、 各 図面に示される同一または同等の構成要素、 部材、 処理等には同一の符号を 付し、 適宜重複した説明は省略する。 また、 実施の形態は発明を限定するも のではなく例示であり、 実施の形態に記述されるすべての特徴やその組み合 わせは必ずしも発明の本質的なものであるとは限らない。 [0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, treatments, etc. shown in the drawings are denoted by the same reference numerals, and the duplicated description will be omitted as appropriate. Further, the embodiment is not a limitation of the invention but an example, and all the features and combinations thereof described in the embodiment are not necessarily essential to the invention.
[0024] 図 1 ( ) 乃至 ( ) は本発明に係る電動作業機及びそのハウジングの成形
〇 2020/175006 7 卩(:171? 2020 /003662 [0024] Figs. 1 () to () are molding of an electric working machine and a housing thereof according to the present invention. 〇 2020/175006 7 卩(:171? 2020/003662
方法の模式的な実施の形態 1 を示す。 この実施の形態 1では、 _体の筒形状 を成す筒形状部 1 〇 3を有し、 筒形状部 1 0 3の内部にモータを収容する電 動作業機のハウジング 1 0の側面に、 防塵性を高めるために第 1のリブとし ての外側リブ 1 2と、 第 2のリブとしての内側リブ 1 3を設けていわゆるラ ピリンス構造とした通気口 1 1 を設けている。 通気口 1 1はハウジング内外 を連通しており、 筒形状部 1 〇 3内部のモータを冷却する空気の吸気又は排 気のための風窓として機能する。 1 shows a schematic first embodiment of the method. In the first embodiment, the dust-proof is provided on the side surface of the housing 10 of the electric operating machine that has the cylindrical portion 103 that has the shape of a cylindrical body and that houses the motor inside the cylindrical portion 103. In order to improve the property, an outer rib 12 as a first rib and an inner rib 13 as a second rib are provided to provide a ventilation port 11 having a so-called laplin structure. The vent 11 communicates with the inside and outside of the housing, and functions as a wind window for intake or exhaust of air that cools the motor inside the tubular portion 103.
[0025] 図 1 (八) のように通気口 1 1 に設けられた外側リブ 1 2及び内側リブ 1 3 は、 ハウジング 1 0の内外を貫通する貫通方向 (具体的には筒形状部 1 〇 3 の径方向) における位置が異なり、 外側リブ 1 2よりも内側に内側リブ 1 3 が配され、 径方向視において外側リブ 1 2と内側リブ 1 3とは互いに重なら ない配置となっている。 また、 外側リブ 1 2及び内側リブ 1 3は、 ハウジン グ 1 0の筒形状部 1 0 3の軸方向 (後述のコア部 1 0 3の移動方向である X 方向と平行) に対して傾斜して (非平行に) 形成される。 [0025] As shown in Fig. 1 (eight), the outer ribs 12 and the inner ribs 13 provided in the vent hole 11 have a penetrating direction that penetrates the inside and the outside of the housing 10 (specifically, the cylindrical portion 10). (3 radial direction), the inner rib 13 is arranged inside the outer rib 12 so that the outer rib 1 2 and the inner rib 1 3 do not overlap each other when viewed in the radial direction. .. The outer ribs 12 and the inner ribs 13 are inclined with respect to the axial direction of the tubular portion 103 of the housing 10 (parallel to the X direction which is the moving direction of the core portion 10 3 described later). Are formed (non-parallel).
[0026] このようなハウジング 1 0を成形する場合、 相互に接離可能な第 1及び第 2 キヤビティ部 1 0 1 , 1 0 2と、 接合状態の第 1及び第 2キヤビティ部 1 0 1 , 1 0 2で形成された凹部に嵌入可能なコア部 1 0 3とを有する成形型 1 0 0を用いて、 ハウジング 1 0の通気口 1 1 に設けられる外側リブ 1 2及び 筒形状部 1 〇 3の貫通方向視 (具体的には径方向視) において外側リブ 1 2 と重ならない配置の内側リブ 1 3を一度に成形する。 [0026] When molding such a housing 10, the first and second cavity parts 10 1, 10 2 which can be contacted and separated from each other, and the first and second cavity parts 10 1, which are in a joined state. By using the molding die 100 having the core portion 10 3 which can be fitted into the concave portion formed by 10 2, the outer ribs 12 and the tubular portion 10 provided in the vent hole 11 of the housing 10 are used. The inner rib 13 which is arranged so as not to overlap the outer rib 12 when viewed in the penetration direction of 3 (specifically, in the radial direction) is molded at one time.
[0027] ここで、 第 1キヤビティ部 1 0 1及び第 2キヤビティ部 1 0 2は丫方向、 コ ア部 1 0 3は丫方向に直交する X方向に往復移動可能であり、 三者が接合し た状態にてハウジング 1 〇の成形空間に樹脂を充填して成形する (例えば射 出成形) 。 通気口 1 1 に設けられる外側リブ 1 2は、 図 1 (巳) に示すよう にハウジング側面において外側リブ 1 2となる部分の両側に第 1及び第 2キ ヤビティ部 1 0 1 , 1 0 2の凸部
1 0 2 3によって図 1 (巳) , ( ) に示す長方形をなすスリッ ト状開口 1 5を形成することで行う。 通気口 1 1 に設けられる内側リブ 1 3は、 ハウジング 1 0の側面の内側 (筒形状部
〇 2020/175006 8 卩(:171? 2020 /003662 [0027] Here, the first cavity portion 10 1 and the second cavity portion 10 2 are capable of reciprocating movement in the vertical direction, the core portion 10 3 is capable of reciprocating in the X direction orthogonal to the vertical direction, and the three members are joined. In this state, fill the molding space of the housing 10 with resin and mold (for example, injection molding). The outer ribs 12 provided on the ventilation holes 11 are, as shown in Fig. 1 (Mimi), located on the sides of the housing on both sides of the outer ribs 1 2 on both sides of the first and second cavity portions 1 0 1, 1 0 2 Convex part of This is done by forming a rectangular slit-shaped opening 15 shown in Figs. 1 (M) and () by 10 2 3. The inner ribs 13 provided on the vent 11 are located inside the side surface of the housing 10 (cylindrical portion). 〇 2020/175006 8 卩(:171? 2020/003662
1 〇 3の径方向内側) において、 内側リブ 1 3となる凹部 1 0 3 3をコア部 1 0 3に設けることで形成する。 図 1 (巳) に示すように、 外側リブ 1 2と 内側リブ 1 3とは筒形状部 1 0 3の径方向視において必然的に重ならない配 置となる。 また、 内側リブ
(Diameter inside of 103)), the core 1033 is provided with a recess 1033 that will become the inner rib 13. As shown in FIG. 1 (Mimi), the outer ribs 12 and the inner ribs 13 are arranged so that they do not necessarily overlap with each other when viewed in the radial direction of the tubular portion 103. Also inside ribs
方向に対して傾いており、 第 1及び第 2キヤビティ部 1 0 1 , 1 0 2の接離 方向 (丫方向) 及びコア部 1 0 3の嵌入方向 (X方向) に対して非平行であ る。 It is tilted with respect to the direction, and is not parallel to the contacting/separating direction of the first and second cavity parts 1 0 1 and 1 0 2 (falling direction) and the fitting direction of the core part 10 3 (X direction). It
[0028] 樹脂が固化した成形品のハウジング 1 0の型抜きは、 第 1キヤビティ部 1 0 [0028] The die-molding of the housing 10 of the molded product in which the resin is solidified is performed using the first cavity portion 10
1及び第 2キヤビティ部 1 0 2を丫方向において互いに離間する方向、 コア 咅^ 1 0 3を丫方向に直交する X方向において抜き方向に移動させることで行 ぅ。 This is done by moving the first and second cavity parts 102 in a direction in which they are separated from each other in the vertical direction, and by moving the core socket 1030 in the removal direction in the X direction orthogonal to the vertical direction.
[0029] 外側リブ 1 2については、 第 1及び第 2キヤビティ部 1 0 1 , 1 0 2を丫方 向において互いに離間する向きに移動させて型抜きする。 型抜きを円滑に行 うため、 図 1 (巳) のように X方向及び丫方向に直交する外側リブ 1 2の幅 方向寸法は、 抜き勾配によりハウジング 1 〇の筒形状の径方向外側に向かっ て小さくなっている (図 1 4の比較例と実質同じ) 。 With respect to the outer ribs 12, the first and second cavity parts 10 1 and 10 2 are moved in a direction in which they are separated from each other in the upward direction, and die-cutting is performed. In order to facilitate the die cutting, as shown in Fig. 1 (Min), the width dimension of the outer ribs 12 that are orthogonal to the X direction and the ridge direction is set so as to face the outer radial direction of the cylindrical shape of the housing 10 due to the draft. It has become smaller (substantially the same as the comparative example in Fig. 14).
[0030] —方、 内側リブ 1 3については、 コア部 1 0 3を内側リブ 1 3の長手方向に 対し傾斜した X方向において抜き方向に移動させて型抜きする。 この場合、 型抜きを円滑に行うための抜き勾配を内側リブ 1 3に設けるが、 抜き勾配を 付けるための基準面 1 3 3は内側リブ 1 3のハウジング外側に露出する面と なり、 基準面 1 3 3を抜き勾配の開始点として基準面 1 3 3の長手方向に沿 った内側リブ 1 3の側面 1 3匕に所要の抜き勾配を付ける。 つまり、 抜き勾 配は、 内側リブ 1 3の長手方向とコア部 1 0 3の抜き方向とが非平行である ため、 図 1 (〇) , (0) に示すように内側リブ 1 3の長手方向に対して傾斜 した方向に設けることになり、 図 1 (巳) のように内側リブ 1 3の X , 丫方 向に垂直な幅寸法は、 筒形状の径方向内側に向かって小さくなっていて、 内 側リブ 1 3の基準面 1 3 3の長手方向に沿った側面 1 3 が傾斜面に形成さ れる。 このため、 内側リブ 1 3を筒形状の径方向視で見たとき、 図 1 (〇) ,
〇 2020/175006 9 卩(:171? 2020 /003662 On the other hand, with respect to the inner ribs 13, the core portion 103 is moved in the cutting direction in the X direction inclined with respect to the longitudinal direction of the inner ribs 13 to perform die cutting. In this case, the inner rib 13 is provided with a draft for smooth die cutting, but the reference surface 1 3 3 for drafting is the surface exposed to the outside of the housing of the inner rib 13 and the reference surface With 1 3 3 as the starting point of the draft, apply the required draft to the side surface 1 3 of the inner rib 1 3 along the longitudinal direction of the reference plane 1 3 3 . In other words, since the longitudinal direction of the inner rib 13 is not parallel to the longitudinal direction of the core part 103, the longitudinal direction of the inner rib 13 is as shown in Fig. 1 (○) and (0). As shown in Fig. 1 (Mimi), the width dimension of the inner rib 13 perpendicular to the X and direction is smaller toward the inner side in the radial direction of the tubular shape. As a result, the side surface 1 3 along the longitudinal direction of the reference surface 1 3 3 of the inner rib 13 is formed as an inclined surface. Therefore, when the inner rib 13 is viewed from the radial direction of the cylinder, it is shown in Fig. 1 (○), 〇 2020/175006 9 卩(:171? 2020/003662
(〇) のように X方向及び丫方向に直交する内側リブ 1 3の外面 (基準面 1 3 3) の幅方向寸法は、 内側リブ 1 3の長手方向に沿って一定 (若しくは略 一定) にすることが可能である。 つまり、 通気口 1 1の外側開口となる各ス リッ ト状開口 1 5から見える内側リブ 1 3の幅は一定 (若しくは略一定) に することができ、 図 1 (巳) , ( ) のように各スリッ ト状開口 1 5は防塵性 に配慮した細長い長方形とすることができる。 As shown in (○), the widthwise dimension of the outer surface (reference surface 1 3 3) of the inner rib 13 which is orthogonal to the X direction and the vertical direction is constant (or substantially constant) along the longitudinal direction of the inner rib 13. It is possible to In other words, the width of the inner rib 13 seen from each slit-shaped opening 15 that is the outer opening of the ventilation hole 11 can be made constant (or approximately constant), as shown in Fig. 1 (Mitsumi) and (). In addition, each slit-shaped opening 15 can be made into an elongated rectangle in consideration of dust resistance.
[0031 ] 本実施の形態によれば、 下記の効果を奏することができる。 [0031] According to the present embodiment, the following effects can be obtained.
[0032] (1) 筒形状部 1 0 3を有し、 その内部にモータを収容するハウジング 1 0と 、 ハウジング 1 0の所定外面に設けられてハウジング内外を連通する通気口 1 1 と、 通気口 1 1 に設けられる複数のリブと、 を備える場合において、 複 数のリブは、 ハウジング内外を貫通する貫通方向における位置が異なる外側 リブ 1 2と内側リブ 1 3とを含み、 外側リブ 1 2と内側リブ 1 3は、 所定外 面での前記貫通方向視において重ならないように一体に成形されたラビリン ス構造とした。 これにより、 粉塵や水滴等の異物が通気口 1 1から侵入する ことを抑制して防塵性を高めることが可能であるとともに、 外側リブ 1 2と 内側リブ 1 3とを別体で形成する構成と比べて強度を向上することができる 。 尚、 内側リブ 1 2と外側リブ 1 3とが貫通方向視において重ならないよう に配置したため、 図 1 (巳) に示すように第 1あるいは第 2キヤビティ部 1 0 1 , 1 0 2とコア部 1 0 3とを貫通方向へ互い違いに突出させ、 外側リブ 1 2と内側リブ 1 3とを一体に形成することが可能である。 [0032] (1) A housing 10 having a tubular portion 103, in which a motor is housed, a vent 11 provided on a predetermined outer surface of the housing 10 for communicating the inside and outside of the housing, and a vent. When a plurality of ribs provided in the mouth 11 are provided, the plurality of ribs include an outer rib 12 and an inner rib 13 which penetrate the inside and the outside of the housing and have different positions in the penetration direction, and the outer rib 1 2 The inner rib 13 and the inner rib 13 have a labyrinth structure integrally formed so that they do not overlap with each other on the predetermined outer surface when viewed in the penetration direction. As a result, it is possible to prevent foreign matter such as dust and water droplets from entering through the vent 11 to improve the dustproof property, and to form the outer rib 1 2 and the inner rib 13 separately from each other. The strength can be improved compared with. Since the inner ribs 12 and the outer ribs 13 are arranged so as not to overlap with each other when viewed in the penetrating direction, as shown in Fig. 1 (Mimi), the first or second cavity portion 1 0 1, 1 0 2 and the core portion The outer ribs 12 and the inner ribs 13 can be integrally formed by alternately projecting 10 3 and 10 3 in the penetrating direction.
[0033] (2) 内側リブ 1 3の長手方向が、 筒形状部 1 0 3の軸方向及び径方向に対し て非平行であるため、 所定外面での貫通方向視における内側リブ 1 3の幅を 、 貫通方向内側に向けて小さく し、 内側リブ 1 3の長手方向に沿った側面を 傾斜面とすることで、 成形時の抜き勾配を内側リブ 1 3の長手方向に設ける 必要がなくなる。 これにより、 内側リブ 1 3の径方向視における幅 (X , 丫 方向に直交する方向の幅寸法) を略一定にできる。 従って、 内側リブ 1 3の 長手方向の全長にわたり十分な幅寸法を確保し、 所要の強度を得ることがで きる。 さらに、 外側リブ 1 2の両側のスリッ ト状開口 1 5は内側リブ 1 3の
〇 2020/175006 10 卩(:171? 2020 /003662 (2) Since the longitudinal direction of the inner rib 13 is non-parallel to the axial direction and the radial direction of the tubular portion 103, the width of the inner rib 13 on the predetermined outer surface when viewed in the penetrating direction. Is reduced inward in the penetrating direction, and the side surface along the longitudinal direction of the inner rib 13 is an inclined surface, so that it is not necessary to provide a draft at the time of molding in the longitudinal direction of the inner rib 13. As a result, the width of the inner rib 13 as viewed in the radial direction (X, the width dimension in the direction orthogonal to the vertical direction) can be made substantially constant. Therefore, it is possible to secure a sufficient width dimension over the entire length of the inner rib 13 in the longitudinal direction and obtain a required strength. In addition, the slit-shaped openings 15 on both sides of the outer ribs 12 should be 〇 2020/175006 10 卩(:171? 2020/003662
幅よりも僅かに大きな幅の長方形とすることが可能で防塵性の向上が可能で ある。 A rectangle with a width slightly larger than the width can be used to improve dust resistance.
[0034] (3) ハウジング 1 0を成形するための成形型 1 0 0は、 第 1及び第 2キヤビ ティ部 1 0 1 , 1 0 2と、 接合状態の第 1及び第 2キヤビティ部 1 0 1 , 1 0 2に嵌入可能なコア部 1 0 3とを有する構造であり、 特殊な構造を必要と しない。 また、 内側リブ 1 3の長手方向を第 1及び第 2キヤビティ部 1 0 1 , 1 0 2の接離方向及びコア部 1 0 3の嵌入方向に対して非平行に設定する ことにより、 成形時の抜き勾配を内側リブ 1 3の長手方向に設ける必要がな くなる。 これにより、 内側リブ 1 3の径方向視における幅を略一定にできる (3) The molding die 100 for molding the housing 10 is composed of the first and second cavity parts 1 0 1 and 10 2 and the first and second cavity parts 1 0 in the joined state. This is a structure having a core portion 10 3 which can be fitted into 1 and 10 2, and does not require a special structure. Also, by setting the longitudinal direction of the inner rib 13 to be non-parallel to the contact and separation direction of the first and second cavity parts 10 1 and 10 2 and the fitting direction of the core part 10 3, It is no longer necessary to provide a draft in the longitudinal direction of the inner rib 13. As a result, the width of the inner rib 13 in the radial direction can be made substantially constant.
[0035] 図 2乃至図 9を用いて、 本発明を電動作業機としてのハンマドリルに適用し た実施の形態 2を説明する。 ハンマドリル 1は、 工具保持部 3で保持される 先端工具 (図示せず) に回転力と打撃力を加えることで、 コンクリートや石 材等の被削材に対して、 斫り作業、 穴あけ作業、 破砕作業を行うことができ る。 ハンマドリル 1の外殻部は、 ハウジング 1 0及びギヤケース 3 0によつ て構成される。 ハウジング 1 0は、 樹脂成形体である。 ギヤケース 3 0は、 例えばアルミ等の金属製である。 ギヤケース 3 0には、 サイ ドハンドル 3 1 が設けられる。 A second embodiment in which the present invention is applied to a hammer drill as an electric working machine will be described with reference to FIGS. 2 to 9. The hammer drill 1 applies a rotating force and a striking force to a tip tool (not shown) held by the tool holding unit 3 to perform scraping work, drilling work, and scraping work on work materials such as concrete and stone. Crushing work can be performed. The outer shell of the hammer drill 1 is composed of a housing 10 and a gear case 30. The housing 10 is a resin molded body. The gear case 30 is made of metal such as aluminum. A side handle 3 1 is provided on the gear case 30.
[0036] ハウジング 1 0は、 モータ 2等を収容するモータ収容部となる一体の筒形状 をなす筒形状部 1 〇 3と、 作業者が把持するハンドル部 1 0匕と、 を有する 。 ハンドル部 1 0匕の上端部に、 作業者がモータ 2の駆動、 停止を指示する ためのトリガスイッチ 5が設けられる。 ギヤケース 3 0は、 モータ 2の回転 を伝達して工具保持部 3で保持された先端工具を駆動 (回転及び打撃) する 動力伝達機構 4を収容する。 この動力伝達機構 4の構成は周知なので、 詳細 は省略する。 [0036] The housing 10 has a tubular portion 103 having an integral tubular shape that serves as a motor housing portion for housing the motor 2 and the like, and a handle portion 10 for gripping by an operator. A trigger switch 5 is provided on the upper end of the handle 10 to allow the operator to instruct the motor 2 to drive or stop. The gear case 30 accommodates a power transmission mechanism 4 that transmits the rotation of the motor 2 and drives (rotates and strikes) the tip tool held by the tool holder 3. Since the structure of the power transmission mechanism 4 is well known, its details are omitted.
[0037] ハウジング 1 0において一体の筒形状を成す筒形状部 1
及び通気口 1 1 を有する図 3に示す部分について詳述する。 図 3は実施の形態 2の要部であ つて、 この図に示すように、 通気口 1 1はモータ 2を収納する部分である筒
〇 2020/175006 1 1 卩(:171? 2020 /003662 [0037] The tubular portion 1 that forms an integral tubular shape in the housing 10 The portion shown in FIG. 3 having the ventilation holes 11 will be described in detail. FIG. 3 is a main part of the second embodiment. As shown in this figure, the vent 11 is a cylinder that is a part for housing the motor 2. 〇 2020/175006 1 1 卩(:171? 2020/003662
形状部 1 〇 3よりもハンドル部 1 〇 13寄りに配置され、 複数の略長方形状 ( 幅が略一定) のスリツ ト状開口 1 5、 それらの間に形成された外側リブ 1 2 、 及び筒形状部 1 〇 3の径方向において外側リブ 1 2よりも内側位置にある 内側リブ 1 3を有している。 また、 外側リブ 1 2と内側リブ 1 3は、 径方向 視において重ならず、 スリツ ト状開口 1 5から内側リブ 1 3が見える配置で ある。 これにより、 通気口 1 1はラビリンス構造となっている。 A plurality of slit-shaped openings 15 each having a substantially rectangular shape (having a substantially constant width), which are arranged closer to the handle portion 1013 than the shape portion 103, the outer ribs 12 formed between them, and the tube. The shape portion 103 has an inner rib 13 located inside the outer rib 12 in the radial direction. Further, the outer ribs 12 and the inner ribs 13 do not overlap each other when viewed in the radial direction, and the inner ribs 13 are visible from the slit-shaped openings 15. As a result, the vent 11 has a labyrinth structure.
[0038] 図 4 (八) は図 3の八 1 -八 1半断面図、 (巳) は成形型を併せて示す八 1 _八 1半断面図、 図 5 (八) は図 3の八 2 -八 2半断面図、 (巳) は成形型 を併せて示す八 2 _八 2半断面図、 及び図
斜視図である。 こ れらの図からわかるように、 内側リブ
[0038] Fig. 4 (eight) is a 8 1 -8 1 half cross-sectional view of Fig. 3, (m) is an 8 1 _ 8 1 half cross-sectional view showing the molding die together, and Fig. 5 (eight) is the eight 1- 2-8 2 and a half sectional view, (M) shows 8 2 _ 8 2 and a half sectional view together with the molding die It is a perspective view. As you can see from these figures, the inner ribs
方向 (コア部 1 0 3の抜き方向 (X方向) と平行) に対して傾斜し、 第 1キ ヤビティ部 1 0 1 (及び第 2キヤビティ部:実施の形態 2では図示省略) の 移動方向である丫方向に対しても非平行である。 また、 外側リブ 1 2と、 こ れより径方向位置が内側の内側リブ 1 3との間にはスリツ ト状開口 1 5に連 通する空気通路となる隙間 1 6が形成されている。 Direction (parallel to the extraction direction (X direction) of the core portion 103) and the moving direction of the first cavity portion 10 1 (and the second cavity portion: not shown in the second embodiment) It is also non-parallel to a certain direction. In addition, a gap 16 is formed between the outer rib 12 and the inner rib 13 located radially inward of the outer rib 12 as an air passage communicating with the slit-shaped opening 15.
[0039] 図 7 (八) は図 4 (八) の巳 1 -巳 1側断面図、 (巳) は成形型を併せて示 す図 4 (八) の巳 1 _巳 1側断面図、 図 8 (八) は図 4 (八) の巳 2 _巳 2 側断面図、 (巳) は成形型を併せて示す図 4 ( ) の巳 2 _巳 2側断面図、 及び図
半断面図であり、 各内側リブ 1 3は筒形状部 1 0 3 の軸方向と平行なコア部 1 〇 3の抜き方向に向かって抜き勾配が形成されて いる。 つまり、 内側リブ 1 3の長手方向は筒形状部 1 0 3の軸方向に対して 傾斜しているから、 抜き勾配は内側リブ 1 3の長手方向に一致するように形 成する必要がなくなり、 図 7 (八) , (巳) 及び図 8 (八) , (巳) のように 、 筒形状部 1 0 3の径方向視でみた内側リブの幅寸法を略一定にすることが 可能である。 また、 図 3の〇_〇半断面図である図 9 (八) , (巳) において 、 前記径方向視における内側のリブ 1 3の幅は、 前記抜き勾配に起因して前 記径方向の内側に向けて小さくなり、 内側リブ 1 3の長手方向に沿った側面 が傾斜面に形成される。
〇 2020/175006 12 卩(:171? 2020 /003662 [0039] Fig. 7 (eight) is a sectional view taken along the line 1-Min 1 of Fig. 4 (eight), and (Min) is a sectional view showing the forming die together, and is shown in Fig. 4 (8). Fig. 8 (eight) is a sectional view taken along the side of Min 2__Min 2 in Fig. 4(8), and (Min) is a sectional view showing the forming mold together with Fig. 4() It is a half cross-sectional view, and each inner rib 13 is formed with a draft in a drawing direction of a core part 103 which is parallel to an axial direction of the tubular part 103. That is, since the longitudinal direction of the inner rib 13 is inclined with respect to the axial direction of the tubular portion 103, it is not necessary to form the draft so as to match the longitudinal direction of the inner rib 13. As shown in Fig. 7 (8), (Mimi) and Fig. 8 (8), (Mimi), it is possible to make the width dimension of the inner rib of the cylindrical portion 103 as viewed in the radial direction substantially constant. .. In addition, in FIGS. 9 (8) and (M), which is a cross-sectional view taken along line XX of FIG. 3, the width of the inner rib 13 in the radial direction is the same as that of the radial direction due to the draft. The side surface along the longitudinal direction of the inner rib 13 becomes smaller toward the inner side and is formed as an inclined surface. 〇 2020/175006 12 卩(:171? 2020/003662
[0040] 実施の形態 2の作用効果は、 模式的な実施の形態 1 と同様であり、 ハンマド リル 1のような一体の筒形状を成す筒形状部 1 0 3を有するハウジング 1 0 であっても防塵性の優れたラビリンス構造の通気口 1 1 を特殊な成形型を用 いることなく作製可能である。 The operation and effect of the second embodiment is similar to that of the schematic first embodiment, and is a housing 10 having a tubular portion 10 3 forming an integral tubular shape like a hammer drill 1. The labyrinth structure vent 11 with excellent dust resistance can be manufactured without using a special mold.
[0041 ] 図 1 0乃至図 1 3は本発明を電動作業機としてのハンマドリルに適用した実 施の形態 3であって、 ハンマドリル 1の外殻部は、 一体の筒形状を成す筒形 状部 1 0 3を有するハウジング 1 0及びギヤケース 3 0を有するが、 ハウジ ング 1 0はハンドル部 1 0匕を含む部分を 2分割した構成となっている。 図 1 0はハウジング 1 0のハンドル部 1 0 を含む部分を 2分割した構成を示 す左側面図、 図 1 1は同じく左方からみた分解斜視図、 図 1 2は同じく右側 面図、 図 1 3は同じく右方からみた分解斜視図である。 [0041] Figs. 10 to 13 show Embodiment 3 in which the present invention is applied to a hammer drill as an electric working machine, in which the outer shell portion of the hammer drill 1 is a tubular portion that forms an integral tubular shape. Although it has a housing 10 having a 10 3 and a gear case 30, the housing 10 has a structure in which a portion including the handle portion 10 is divided into two parts. Fig. 10 is a left side view showing a structure in which the part of the housing 10 including the handle portion 10 is divided into two parts. Fig. 11 is an exploded perspective view of the same from the left side. Fig. 12 is a right side view of the same. Similarly, 13 is an exploded perspective view seen from the right side.
[0042] これらの図に示すように、 ハウジング 1 0は、 一体の筒形状を成す筒形状部 [0042] As shown in these figures, the housing 10 has a tubular portion that forms an integral tubular shape.
1 0 3を一体に有し、 かつハンドル部 1 0 13の半分を有するハウジング部 2 0と、 ハンドル部 1 0匕の残りの半分を含む部分を有するハウジング部 2 1 の組み合わせ構造 (例えばネジ止めで一体化する構造) である。 ハウジング 部 2 0の一方 (右側) の通気口 1 1 に設けられる外側リブ 1 2 , 内側リブ 1 3、 スリッ ト状開口 1 5等は前述の実施の形態 2と同様の構成であって、 同 様の成形型で同時に成形される。 A combined structure of a housing part 20 having an integral part of 10 3 and a half of the handle part 10 13 and a housing part 2 1 having a part including the other half of the handle part 10 13 (for example, screwing It is a structure that is integrated with. The outer ribs 12, inner ribs 13, slit-shaped openings 15 and the like provided in the vent hole 11 on one side (right side) of the housing 20 have the same configuration as in the second embodiment described above. It is molded at the same time with the same mold.
[0043] 他方 (左側) の通気口 1 1は、 別の成形体であるハウジング部 2 1 に形成さ れた外側リブ 1 2及びスリッ ト状開口 1 5と、 ハウジング部 2 0側に形成さ れた内側リブ 1 3との組み合わせでラビリンス構造としている。 The other (left) vent 11 is formed on the side of the housing 20 and the outer rib 12 and the slit-shaped opening 15 formed on the housing 21 which is another molded body. It has a labyrinth structure in combination with the inner ribs 13.
[0044] この実施の形態 3の場合、 一方のハウジング部 2 0がモータを収納する筒形 状部 1 0 3とハンドル部 1 0匕の半分を一体に有するため、 ハンドル 1 〇匕 の強度を高めることができる。 [0044] In the case of the third embodiment, since one housing portion 20 integrally has a tubular portion 1033 for accommodating a motor and half of the handle portion 10 s, the strength of the handle 10 s Can be increased.
[0045] 以上、 実施の形態を例に本発明を説明したが、 実施の形態の各構成要素や各 処理プロセスには請求項に記載の範囲で種々の変形が可能であることは当業 者に理解されるところである。 以下、 変形例について触れる。 Although the present invention has been described with reference to the exemplary embodiments, it will be understood by those skilled in the art that various modifications can be made to each constituent element and each processing process of the exemplary embodiments within the scope of the claims. Is understood by. The modified examples will be described below.
[0046] 本発明の実施の形態 2 , 3では電動作業機としてハンマドリルを例示したが
〇 2020/175006 13 卩(:171? 2020 /003662 [0046] In the second and third embodiments of the present invention, the hammer drill is exemplified as the electric working machine. 〇 2020/175006 13 卩(:171? 2020/003662
、 グラインダ、 集塵機、 草刈り機等の一体の筒形状を有するハウジングに適 用可能である。 It can be applied to housings that have an integral tubular shape, such as grinders, dust collectors, and mowers.
符号の説明 Explanation of symbols
[0047] 1 電動作業機、 2 モータ、 3 工具保持部、 4 動力伝達機構、 1 0, [0047] 1 electric working machine, 2 motor, 3 tool holder, 4 power transmission mechanism, 10,
200 ハウジング、 1 〇 3, 2003 筒形状部、 1 01^"ハンドル部、 1 1 , 201 通気口、 1 2, 202 外側リブ、 1 3, 203 内側リブ 、 1 5, 205 スリッ ト状開口、 1 01, 301 第 1キヤビティ部、 1 02, 302 第 2キヤビティ咅1 1 03, 303 コア咅6
200 Housing, 1 03, 2003 Cylindrical part, 101^" Handle, 1 1, 201 Vent, 1 2, 202 Outer rib, 1 3, 203 Inner rib, 1 5, 205 Slit-like opening, 1 01, 301 1st section, 1 02, 302 2nd section 1 1 03, 303 Core section 6
Claims
[請求項 1 ] モータと、 [Claim 1] A motor,
一体の筒形状を有し、 内部に前記モータを収容するハウジングと、 前記ハウジングの所定外面に設けられて前記ハウジング内外を連通す る通気口と、 A housing having an integral tubular shape and containing the motor therein; and a vent hole provided on a predetermined outer surface of the housing for communicating the inside and outside of the housing,
前記通気口に設けられる複数のリブと、 を備え、 A plurality of ribs provided in the vent,
前記複数のリブは、 前記ハウジング内外を貫通する貫通方向における 位置が異なる第 1のリブと第 2のリブとを含み、 前記第 1のリブと前 記第 2のリブとは前記所定外面での前記貫通方向視において重ならな い部分を有するように一体に成形されている、 電動作業機。 The plurality of ribs include a first rib and a second rib that penetrate the inside and the outside of the housing and have different positions in the penetrating direction, and the first rib and the second rib are formed on the predetermined outer surface. An electric working machine integrally molded so as to have non-overlapping portions when viewed in the penetration direction.
[請求項 2] 前記通気口は、 前記ハウジングの側面に設けられ、 前記貫通方向とし ての前記筒形状の径方向に沿つて前記/ヽウジング内外を連通しており 前記第 1のリブと前記第 2のリブは、 前記径方向における位置が異な り、 かつ前記径方向視において重ならない配置である、 請求項 1 に記 載の電動作業機。 [Claim 2] The ventilation port is provided on a side surface of the housing, and communicates the inside/outside of the casing along the radial direction of the tubular shape as the penetration direction, and the first rib and the first rib. The electric working machine according to claim 1, wherein the second ribs are arranged at different positions in the radial direction and do not overlap each other when viewed in the radial direction.
[請求項 3] 前記第 2のリブの長手方向が、 前記筒形状の軸方向及び前記径方向に 対して非平行である、 請求項 1又は 2に記載の電動作業機。 3. The electric working machine according to claim 1, wherein a longitudinal direction of the second rib is nonparallel to the axial direction and the radial direction of the tubular shape.
[請求項 4] 前記第 2のリブは、 前記貫通方向における位置が前記第 1のリブより も内側に配置され、 前記所定外面での前記貫通方向視における前記第 2のリブの幅が、 前記貫通方向内側に向けて小さくなるように、 前記 第 2のリブの長手方向に沿つた側面が前記貫通方向に対して傾斜する ように形成されている、 請求項 1乃至 3の何れか一項に記載の電動作 業機。 4. The second rib is arranged at a position in the penetrating direction inside the first rib, and the width of the second rib in the penetrating direction on the predetermined outer surface is 4. The side surface along the longitudinal direction of the second rib is formed to be inclined with respect to the penetrating direction so as to become smaller toward the inner side in the penetrating direction. Electric operation machine described.
[請求項 5] 前記第 2のリブは、 前記所定外面での前記貫通方向視における幅方向 の寸法が、 前記長手方向において略一定である、 請求項 4に記載の電 動作業機。 5. The electric operating machine according to claim 4, wherein the second rib has a dimension in the width direction in the penetration direction on the predetermined outer surface that is substantially constant in the longitudinal direction.
[請求項 6] 前記第 1のリブ及び前記第 2のリブは、 それぞれ複数設けられる、 請
〇 2020/175006 15 卩(:171? 2020 /003662 [Claim 6] The plurality of first ribs and the plurality of second ribs are respectively provided. 〇 2020/175006 15 卩(:171? 2020/003662
求項 1乃至 5の何れか一項に記載の電動作業機。 The electric working machine according to any one of claims 1 to 5.
[請求項 7] 相互に接離可能な第 1及び第 2キヤビティ部と、 接合状態の前記第 1 及び第 2キヤビティ部に嵌入可能なコア部と、 を用いて電動作業機の ハウジングの成形空間を構成する電動作業機のハウジングの成形方法 であって、 [Claim 7] A molding space for a housing of an electric working machine, comprising: first and second cavity portions that can be brought into and out of contact with each other; and a core portion that can be fitted into the first and second cavity portions in a joined state. A method of molding a housing of an electric working machine, which comprises:
前記成形空間内への樹脂充填で形成される前記ハウジングは、 一体の 筒形状を有するとともに、 所定外面に設けられて前記ハウジング内外 を連通する通気口と、 前記通気口に設けられる複数のリブと、 を有し \ The housing, which is formed by filling the molding space with resin, has an integral tubular shape, and has a ventilation port provided on a predetermined outer surface for communicating the inside and outside of the housing, and a plurality of ribs provided on the ventilation port. Has, \
前記複数のリブは、 前記ハウジング内外を貫通する貫通方向における 位置が異なる第 1のリブと第 2のリブとを含み、 前記第 1のリブと前 記第 2のリブとは前記所定外面での前記貫通方向視において重ならな い部分を有する配置であり、 The plurality of ribs include a first rib and a second rib that penetrate the inside and the outside of the housing and have different positions in the penetrating direction, and the first rib and the second rib are formed on the predetermined outer surface. The arrangement has non-overlapping parts when viewed in the penetration direction,
前記第 2のリブは、 前記貫通方向における位置が前記第 1のリブより も前記ハウジングの内側に配置され、 かつ前記第 2のリブの長手方向 が前記第 1及び第 2キヤビティ部の接離方向及び前記コア部の嵌入方 向に対して非平行である、 電動作業機のハウジングの成形方法。
The position of the second rib in the penetrating direction is arranged inside the housing with respect to the first rib, and the longitudinal direction of the second rib is the contacting/separating direction of the first and second cavities. And a method of molding a housing of an electric working machine, which is non-parallel to the fitting direction of the core portion.
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JP2019-033348 | 2019-02-26 | ||
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PCT/JP2020/003662 WO2020175006A1 (en) | 2019-02-26 | 2020-01-31 | Electric work machine and method for forming housing thereof |
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JPH0320489U (en) * | 1989-03-16 | 1991-02-28 | ||
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JP2010105130A (en) * | 2008-10-30 | 2010-05-13 | Makita Corp | Ventilation window of electric power tool |
CN202713036U (en) * | 2012-08-02 | 2013-01-30 | 无锡锐克电动工具有限公司 | Cylinder type motor housing air inlet structure used for electric hammer |
JP2013039652A (en) * | 2011-08-19 | 2013-02-28 | Hitachi Koki Co Ltd | Electric power tool |
JP2018075685A (en) * | 2016-11-10 | 2018-05-17 | 株式会社マキタ | Electric tool |
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JPH0320489U (en) * | 1989-03-16 | 1991-02-28 | ||
JPH1133934A (en) * | 1997-07-25 | 1999-02-09 | Ryobi Ltd | Housing for electric tool |
JP2008302467A (en) * | 2007-06-07 | 2008-12-18 | Makita Corp | Power tool |
JP2010105130A (en) * | 2008-10-30 | 2010-05-13 | Makita Corp | Ventilation window of electric power tool |
JP2013039652A (en) * | 2011-08-19 | 2013-02-28 | Hitachi Koki Co Ltd | Electric power tool |
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