JP2013039654A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power tool that has improved in dustproofness and water proof capabilities while preventing the occurrence of poor connection between lines caused by vibration.SOLUTION: This power tool provided is comprised of: a motor that drives a tool at its tip, a housing that retains the motor therein, and an LED light unit 25 that is mounted to the housing while delivering radiation to the tool at the tip and the vicinity thereof while the LED light unit 25 has formed therein an irradiating part 26 that emits light, a casing 27 including an accommodation space 27a that accommodates the irradiating part 26 whose portion located at least on the optical axis of the light is formed of a transparent material, and a transparent resin 28 that is disposed in the accommodation space 27a and fills the accommodation space 27a that accommodates the irradiating part 26.

Description

  The present invention relates to a power tool, and more particularly to a power tool with illumination.

  In recent years, with the development of batteries, battery-powered cordless products occupy a large market for power tools such as impact drivers. Cordless products have excellent portability and can be used both indoors and outdoors, but may be exposed to sudden rainfall when used outdoors. Therefore, there is a growing need for power tools that are dustproof and waterproof.

  Moreover, in order to improve the visibility at the time of an operation | work, illumination, such as LED, is provided, and the power tool which irradiates a front-end tool and a work location by this illumination is known. In an electric tool equipped with this illumination, the illumination needs to be dustproof and waterproof. In order to prevent dust and water, Patent Document 1 discloses a configuration in which an LED light is accommodated in a molded holder and a lid is formed with a molded component separate from the holder.

JP 2008-062344 A

  In the configuration in which the LED light is accommodated in the holder and the lid is covered with the molded part, a slight gap is formed between the holder and the molded part, so it is necessary to fill the gap with resin or the like, and the material cost increases. As a result, the assembly workability deteriorated. Further, the LED light vibrates in the holder due to the slight vibration during the work, and there is a possibility that the connection failure occurs due to this vibration. Accordingly, an object of the present invention is to provide an electric tool that improves dustproofness and waterproofness and prevents a poor connection caused by vibration.

  In order to solve the above problems, the present invention includes a motor that drives a tip tool, a housing that holds the motor, and an illumination unit that is attached to the housing and irradiates the tip tool and the vicinity of the tip tool. The illumination unit includes an irradiating unit for irradiating light, a housing in which a housing space for housing the irradiating unit is formed, and at least a portion located on the optical axis of the light is made of a transparent material; Provided is a power tool that includes a transparent resin that is disposed inside and fills a housing space in which the irradiation unit is housed.

  According to such a configuration, since the irradiated portion is covered with the transparent resin, water droplets and dust do not adhere to the irradiated portion, and dustproof and waterproof properties can be obtained. Moreover, since the interior of the accommodation space is filled with the transparent resin, the irradiation unit arranged in the accommodation space does not vibrate relative to the housing even if a slight vibration is generated in the power tool. Therefore, it is possible to prevent the defective connection of the irradiation part caused by vibration.

  In the electric tool configured as described above, the irradiation unit includes a light emitter, a substrate that holds the light emitter, and a conductor that is connected to the external power source and is connected to the substrate and supplies power to the light emitter. It is preferable that the transparent resin covers at least the light-emitting body and the portion where the conductor is connected to the substrate.

  According to such a configuration, it is possible to protect the part that is most required to be dustproof and waterproof and the part that is susceptible to vibration with the transparent resin.

  The light emitter is preferably an LED element.

  Further, it is preferable that a position defining portion for defining the substrate at a predetermined position is provided in the accommodation space.

  According to such a configuration, the position of the substrate within the housing can be defined. Further, the movement of the substrate can be suppressed when the accommodating space is filled with the transparent resin.

  Moreover, it is preferable that this housing | casing is comprised by the tank shape in which this accommodation space was formed. According to such a configuration, the transparent resin can be easily filled into the accommodation space, and the assembly workability can be improved.

  In addition, it is preferable that a lens is defined in a portion of the housing located on the optical axis of the light, and the lens is configured to protrude on the outer surface of the housing.

  According to such a structure, the irradiation performance by an irradiation part can be improved.

  According to the electric tool of the present invention, the dustproof / waterproofness can be improved and the connection failure caused by the vibration can be prevented.

Side surface sectional drawing of the impact driver which concerns on embodiment of this invention. Side surface sectional drawing of the irradiation unit of the impact driver which concerns on embodiment of this invention. Side surface sectional drawing (state before transparent resin filling) of the irradiation unit of the impact driver which concerns on embodiment of this invention. Sectional drawing along the IV-IV line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. An impact driver 1 which is an electric tool shown in FIG. 1 is a tool for fastening bolts, nuts, and screws with a tip tool such as a bit or a socket, and mainly includes a housing 2, a motor 3, a gear mechanism 4, and the like. The impact mechanism 5 is a tool that is driven by using a rechargeable battery 6 as a power source.

  The housing 2 is a resin housing made of 6 nylon, and includes a body part 2A in which the motor 3 and the like are accommodated, and a handle 2B extending from the body part 2A. The inside of the body part 2A and the handle 2B A housing space is defined, and the housing is divided into two substantially symmetric divided housings in a plane extending in the up-down direction and the front-rear direction, which will be described later. The motor 3, the gear mechanism 4, and the impact mechanism 5 are coaxially arranged from one end side to the other end side at a location corresponding to the body portion 2 </ b> A in the accommodation space. In the axial direction in which the motor 3, the gear mechanism 4, and the impact mechanism 5 are arranged, the motor 3 side is defined as the rear side and defined as the front-rear direction. In addition, the vertical direction is defined with the direction perpendicular to the front-rear direction and the handle 2B extending from the body portion 2A as the downward direction, and the horizontal direction with the upper direction in FIG. Define.

  In the body portion 2A, an exhaust port and an intake port (not shown) are formed at the front and rear positions of the motor 3 and the left and right side surfaces of the body portion 2A, respectively. In the housing 2, a terminal portion 21 to which the battery 6 is mounted and electrically connected is disposed at the lower end position of the handle 2 </ b> B. A control circuit unit 100 that controls the rotation of the motor 3 and the light irradiation of the irradiation unit 26 described later is disposed above the terminal unit 21. At the base portion of the handle 2B, a trigger 23A that is operated by an operator is provided, and a switch unit 23B that is connected to the trigger 23A and the control circuit unit 100 and controls conduction to the motor 3 is provided. A forward / reverse switching lever (not shown) for switching the rotation direction of the motor 3 is provided at the base of the handle 2B and above the trigger 23A. As shown in FIG. 1, a cooling passage 2 c is formed in the housing 2 so as to surround the motor 3 and extend from the intake port 2 a to the exhaust port (not shown).

  An LED light unit 25 that is an irradiation unit that is connected to the control circuit unit 100 and irradiates the front side is provided at the front end of the housing 2 and below the impact mechanism 5.

  As shown in FIG. 2, the LED light unit 25 mainly includes an irradiation unit 26, a casing 27, and a transparent resin 28. As shown in FIG. 3, the irradiation unit 26 mainly includes a substrate 26 </ b> A, an LED element 26 </ b> B, and a conductive wire 26 </ b> C. The substrate 26A is configured in a substantially rectangular flat plate shape. The LED element 26B is a known surface-mounted element, and is disposed on the front side of the substrate 26A with the front as the optical axis direction. The conducting wire 26C is connected to the control circuit unit 100 (FIG. 1), and is connected to the rear surface of the substrate 26A by solder to supply power to the LED element 26B.

  The casing 27 is made of a transparent urethane resin, is formed in a tank shape with an accommodation space 27a that opens in the right direction, and has a lens portion 27A on the front surface. Grooves 27b and 27c that are substantially the same as the thickness of the substrate 26A and extend in parallel in the left-right direction are formed in the upper and lower positions in the accommodation space 27a. The distance to the bottom of the substrate 26A is substantially the same as the longitudinal dimension of the substrate 26A. The substrate 26A is accommodated in the accommodation space 27a so that the upper and lower edges of the substrate 26A are accommodated in the grooves 27b and 27c. That is, the position of the substrate 26A within the accommodation space 27a is regulated by the grooves 27b and 27c. The grooves 27b and 27c correspond to the position defining portion.

  The lens portion 27A is configured to protrude forward on the front surface of the housing 27, and is disposed on the optical axis of the LED element 26B, and includes a tip tool (not shown) that emits light emitted from the LED element 26B. It converges so that the workpiece can be irradiated.

  As shown in FIGS. 3 and 4, a groove 27 d is formed on the right side surface on the rear end side of the housing 27 so as to lead out the conducting wire 26 </ b> C without being bent outside the accommodation space 27 a.

  The transparent resin 28 shown in FIG. 2 is a silicon resin or urethane resin that cures at room temperature, and is filled in the accommodation space 27a so as to fill the accommodation space 27a. Therefore, the irradiation unit 26 is integrally bonded to the housing 27, and the LED element 26B on the substrate 26A and the conductor 26C of the substrate 26A are soldered to the irradiation unit 26, and the groove 27d extending from the substrate 26A. The conductive wire 26 </ b> C is covered with a transparent resin 28 and fixed.

  As shown in FIG. 1, the housing 2 is provided with a rubber cap 25 </ b> A that covers the LED light unit 25 while leaving the lens portion 27 </ b> A in a state where the LED light unit 25 is mounted. The rubber cap 25A protects the LED light unit 25 and suppresses the workpiece from being damaged by the LED light unit 25 coming into contact with the workpiece.

  The motor 3 is a DC brushless motor, and mainly includes a stator 31, a rotor 32, and a motor drive circuit device 33. The stator 31 is formed in a cylindrical shape, forms an outer shell of the motor 3, and an outer peripheral surface is held by the housing 2.

  The rotor 32 is rotatably arranged in the stator 31, and a rotor shaft 32 </ b> A extending in the front-rear direction is provided at the rotation axis position so as to rotate coaxially and integrally. At the front end of the rotor shaft 32A, a fan 32B and a pinion gear 32C are mounted so as to rotate coaxially and a bearing 32D is mounted and supported by a frame 4A described later. A bearing 32E is attached to the rear end of the rotor shaft 32A and is supported by the body portion 2A. The rotor shaft 32A is rotatably supported by these bearings 32D and 32E. By rotating the fan 32B integrally with the rotor shaft 32A, an airflow is formed that passes from the inlet port (not shown) through the cooling passage 2c in the housing space in the body portion 2A to the exhaust port (not shown).

  The motor drive circuit device 33 that is a circuit board is disposed behind the stator 31 and fixed to the stator 31, and includes a plurality of switching elements.

  A gear mechanism 4 is disposed on the front side of the motor 3 in the body portion 2A. The gear mechanism 4 is a planetary gear mechanism in which the pinion gear 32C is a sun gear, and is mounted on the housing 2 with the frame body 4A as an outer shell. The gear mechanism 4 includes a spindle 41, a ring gear 42, and a plurality of planetary gears 43. ing. The spindle 41 is a planetary carrier that supports a plurality of planetary gears 43, and supports an anvil 52 described later at the front end thereof so as to be coaxially rotatable, and is supported at the rear end thereof so as to be rotatable via a bearing 4B. . In the vicinity of the rear end of the spindle 41, a flange 41A for supporting the planetary gear 43 and receiving a first spring 54A described later is provided. The spindle 41 is provided with a later-described hammer 53 that is movable in the front-rear direction, and is formed with a pair of grooves 41a, 41a that extend obliquely with respect to the axial direction. Balls 41B and 41B are inserted and connected to the hammer 53 by the balls 41B and 41B.

  The ring gear 42 is disposed so as to be coaxially positioned on the outer periphery of the spindle 41 and is fixed to the frame body 4A so as not to rotate. The plurality of planetary gears 43 are rotatably supported by the spindle 41, meshed with the ring gear 42 and meshed with the pinion gear 32C. With the above configuration, the rotation of the pinion gear 32C is decelerated and transmitted to the spindle 41.

  The impact mechanism 5 mainly includes a hammer case 51, an anvil 52, a hammer 53, and a first spring 54A.

  The hammer case 51 has a cylindrical shape with a narrowed front end, is coaxially connected to the body portion 2A of the housing 2 at the rear end portion, and is coaxially connected to the motor 3, and a bearing 51A that rotatably supports the anvil 52 at the front end portion. have.

  The anvil 52 is formed in a cylindrical shape extending in the front-rear direction, is rotatably supported by the hammer case 51 by a bearing 51A, and the tip end portion of the spindle 41 is fitted in a clearance in a bore 52a formed at the rear end. 41 is rotatably supported. At the front end portion of the anvil 52, a tip tool mounting portion 52A to which a socket (not shown) is mounted is provided. The tip tool mounting portion 52A includes a plurality of balls 52C that can project into a mounting hole 52b formed at the front end of the anvil 52, and are biased rearwardly by a spring and balls 52C in a state of being biased rearward. It is mainly composed of an operation portion 52D that comes into contact with and protrudes the ball 52C into the mounting hole 52b. Further, at the rear end of the anvil 52, blade portions 52E and 52E which are a pair of engaged portions respectively extending in the radial direction and in the opposite directions are integrally provided.

  The hammer 53 is formed in a cylindrical shape in which a through hole 53 a that is mounted on the spindle 41 is formed. The front end of the hammer 53 is a pair of engaging portions, and claw portions 53A and 53A that can engage with the blade portions 52E and 52E, respectively, are provided. The claw portions 53A and 53A protrude from the front end of the hammer 53 to the front side, are disposed at positions 180 degrees apart around the axis, and are formed in a symmetrical shape around the axis. The side surfaces intersecting the circumferential direction of the claw portions 53A and 53A are obliquely configured so that the claw portion 53A is tapered. Therefore, when a load is applied to the hammer 53 with respect to the anvil 52, the anvil 52 moves to the front side relative to the hammer 53 along this side surface, so that the blade portions 52E, 52E are claw portions 53A. 53A, the hammer 53 can rotate relative to the anvil 52. During actual work, the anvil 52 cannot move forward relative to the housing 2, and the hammer 53 moves backward relative to the anvil 52, so that the blade portions 52 </ b> E and 52 </ b> E are similarly moved to the claw portions 53 </ b> A, The hammer 53 can rotate with respect to the anvil 52 over 53A.

  In the hammer 53, grooves 53b and 53b extending in the front-rear direction in which the pair of balls 41B and 41B are inserted are formed on the inner surface of the through hole 53a. The pair of balls 41B and 41B are inserted into the grooves 53b and 53b and the grooves 41a and 41a, respectively, so that the hammer 53 can rotate coaxially and integrally with the spindle 41. On the rear end side of the hammer 53, a receiving portion 53c that receives the first spring 54A is formed in series around a wall that defines the through hole 53a.

  The first spring 54A is supported on the flange 41A of the spindle 41 via a washer, and the front end portion of the spindle 41 is inserted into the first spring 54A through the inside of the first spring 54A and inserted into the receiving portion 53c. The shaft 41 is biased axially and forward. Therefore, the urging direction of the first spring 54A coincides with the axial direction and the front side direction. When the first spring 54A biases the hammer 53 forward, the claw portions 53A and 53A of the hammer 53 can be engaged with the blade portions 52E and 52E of the anvil 52.

  Also, when the hammer 53 moves backward with respect to the anvil 52 under the load described above, the blades 52E and 52E get over the claw portions 53A and 53A, and at the same time, the first spring 54A causes the hammer 53 to be on the front side. The claw portions 53A, 53A and the blade portions 52E, 52E come into contact with each other. As described above, the hammer 53 rotates with respect to the anvil 52, and the claw portions 53A and 53A come into contact with the blade portions 52E and 52E, whereby a striking force in the rotation direction is applied to the anvil 52.

  In the impact driver 1 having the above configuration, the control circuit unit 100 detects a signal output when the trigger 23A is slightly pulled, and supplies power to the LED light unit 25 from the control circuit unit 100 based on the detection result. And irradiate with light. As described above, the irradiation unit 26 is vulnerable to moisture and dust because it includes the LED element 26B, which is an electronic component, and the substrate 26A that holds the LED element 26B and supplies power to the LED element 26B. In addition, since the conductor 26C is connected to the board 26A by solder, the connection place where the board 26A is vibrated in the accommodation space 27a by the slight vibration generated during the operation of the impact driver 1 and the conductor 26C is soldered. May be peeled off, resulting in poor connection. However, since the irradiation part 26 is covered and fixed by the transparent resin 28 filled in the accommodation space 27a, water droplets and dust do not adhere to the LED element 26B and the substrate 26A. The irradiation part 26 does not vibrate in the accommodation space 27a, and the connection failure is suppressed.

  Since the casing 27 filled with the transparent resin 28 has a tank shape with the right side opened as described above, the casing 27 is arranged so that the opening faces upward, and the irradiation unit 26 is accommodated in the accommodation space 27a. In this state, by pouring the transparent resin 28 before curing into the accommodation space 27a, the irradiation part 26 can be easily covered with the transparent resin 28, and the assembling workability is improved.

  Further, since the lens portion 27A is integral with the housing 27, it is not necessary to prepare a separate lens portion. Therefore, the number of component parts constituting the impact driver 1 can be reduced, and productivity can be improved.

  In the impact driver 1 according to the present embodiment, the LED light unit 25 is disposed at the front end of the housing 2 and below the impact mechanism 5, but is not limited to this position. For example, the handle 2B is disposed near the control circuit unit 100. May be.

The power tool of the present invention is not limited to the above-described impact driver, and can be widely used for power tools provided with illumination.

1: Impact driver 2: Housing 2A: Body part 2B: Handle 2a: Intake port 2c: Cooling passage 3: Motor 4: Gear mechanism 4A: Frame body 4B: Bearing 5: Impact mechanism 6: Battery 21: Terminal part 23A: Trigger 23B: Switch unit 25: Light unit 25A: Rubber cap 26: Irradiation unit 26A: Substrate 26B: LED element 26C: Conductor 27: Housing 27A: Lens unit 27a: Housing space 27b: Groove 27c: Groove 27d: Groove 28: Transparent Resin 31: Stator 32: Rotor 32A: Rotor shaft 32B: Fan 32C: Pinion gear 32D: Bearing 32E: Bearing 33: Motor drive circuit device 41: Spindle 41A: Gutter 41B: Ball 41a: Groove 42: Ring gear 43: Planetary gear 51 : Hammer case 51A: Bearing 52 : Anvil 52A: Tip tool mounting part 52C: Ball 52D: Operation part 52E: Blade 52a: Perforation 52b: Mounting hole 53: Hammer 53A: Claw part 53a: Through hole 53b: Groove 53c: Receiving part 54A: First spring 100 : Control circuit

Claims (6)

A motor that drives the tip tool;
A housing for holding the motor;
An illumination unit that is mounted on the housing and irradiates the tip tool and the vicinity of the tip tool, and
The illumination unit includes an irradiating unit that irradiates light, a housing in which a housing space for housing the irradiating unit is formed, and at least a portion located on the optical axis of the light is made of a transparent material, And a transparent resin that fills the accommodation space in which the irradiation unit is accommodated. The irradiation unit includes a light emitter, a substrate that holds the light emitter, and a conductor that is connected to an external power source and is connected to the substrate and supplies power to the light emitter.
The power tool according to claim 1, wherein the transparent resin covers at least the light emitter and a portion where the conductor is connected to the substrate. The power tool according to claim 2, wherein the light emitter is an LED element.   The power tool according to claim 2, wherein a position defining portion that defines the substrate at a predetermined position is provided in the housing space.   The power tool according to any one of claims 1 to 4, wherein the housing is configured in a tank shape with the accommodation space formed therein.   6. The lens according to claim 1, wherein a lens is defined in a portion of the housing located on the optical axis of the light, and the lens is configured to protrude on the outer surface of the housing. The electric tool as described in any one.

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