KR101773914B1 - Gear box of a power tools - Google Patents

Gear box of a power tools Download PDF

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Publication number
KR101773914B1
KR101773914B1 KR1020150150256A KR20150150256A KR101773914B1 KR 101773914 B1 KR101773914 B1 KR 101773914B1 KR 1020150150256 A KR1020150150256 A KR 1020150150256A KR 20150150256 A KR20150150256 A KR 20150150256A KR 101773914 B1 KR101773914 B1 KR 101773914B1
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KR
South Korea
Prior art keywords
lubricant
gear
gear box
power tool
housing
Prior art date
Application number
KR1020150150256A
Other languages
Korean (ko)
Other versions
KR20170049763A (en
Inventor
오성섭
이종진
Original Assignee
계양전기 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 계양전기 주식회사 filed Critical 계양전기 주식회사
Priority to KR1020150150256A priority Critical patent/KR101773914B1/en
Publication of KR20170049763A publication Critical patent/KR20170049763A/en
Application granted granted Critical
Publication of KR101773914B1 publication Critical patent/KR101773914B1/en

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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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B23B45/008—Gear boxes, clutches, bearings, feeding mechanisms or like equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • 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
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/045—Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Details Of Gearings (AREA)

Abstract

According to the present invention, there is provided a gear box of an electric power tool provided inside a power tool body for decelerating a rotational force of a motor to a tip tool side, comprising: a cylindrical gear box housing having one side opened; A planetary gear fixed to the inside of the gear box housing and provided adjacent to the planetary gear, the gear box being fixed to the gear box housing when the planetary gear is rotated, And a lubricant storage portion for storing the lubricant to prevent lubricant from being scattered by gears in the housing.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gear box of a power tool,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear box of a power tool, and more particularly, to a gear box of a power tool that prevents a lubricant flowing into a gear box housing from being scattered during a high-speed rotation of the power tool.

Generally, a power tool drives a built-in motor using electric power as a power source through a wire or a battery to rotate the tool selectively coupled according to the operation purpose of a driver and a drill to perform multi-task such as tightening a screw or drilling a hole It is a tool that can.

Since the motor used in the power tool is rotating at a high speed and lacks torque, which is a tightening force for direct work, there is a structure that a reduction gear is connected to the motor so as to obtain sufficient torque for the work by lowering the number of revolutions.

Particularly, a rechargeable power tool using a battery as a power source is required to be portable, so that a gear box type in which a planetary gear type is applied to achieve a reduction in size and weight and a high reduction ratio is provided.

That is, the planetary gear-type gear box has a ring gear, which is an internal gear fixed inside a generally cylindrical gearbox housing, and a plurality of planetary gears, which are disposed between the sun gears disposed in the axial portion of the ring gear, It has an interlocking structure.

In addition, since a large number of gears are engaged with each other in the gear box housing and continuously rotate at a high speed, heat and noise are generated due to friction. To prevent this, lubricant such as grease is filled.

At this time, when the power tool is driven, the lubricant is scattered to a portion adjacent to the gearbox housing due to the centrifugal force generated by the high-speed rotation of the planetary gear, resulting in insufficient lubricant between the gears.

It is an object of the present invention to provide a gear box of a power tool that prevents lubricant introduced into gears from being scattered even when the gear rotates at high speeds when the power tool is driven .

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a gear box of a power tool, which is provided inside a power tool body, for transmitting a rotational force of a motor to a tip tool side for transmission, A ring gear fixed to the inside of the gear box housing, the ring gear being an internal gear; a planetary gear engaged with the ring gear and fixed inside the gear box housing; And a lubricant reservoir for storing the lubricant to prevent lubricant from being scattered to gears in the gearbox housing during rotation of the planetary gear.

At this time, the lubricant storage portion includes at least one discharge slit into which the lubricant flows into the gears in the gearbox housing.

The lubricant reservoir further includes an inner wall formed with the discharge slit, an outer wall spaced apart from the inner wall, and a storage groove formed between the inner wall and the outer wall and storing the lubricant.

On the other hand, the lubricant may be introduced into the gears inside the gearbox housing when the discharge slit is parallel to the gravity direction toward the inside of the gearbox housing.

According to the above-mentioned problem solving means, the present invention provides a lubricant storing portion in which a lubricant is stored in a gear box housing, so that when the power tool is driven, lubricant is scattered into the gear box housing due to centrifugal force generated by high- And when the driving of the electric power tool is stopped, the lubricant is introduced into the gear box housing through the lubricant storage part, and the lubricating effect between the gears can be improved.

Particularly, the lubricant storage portion is formed to include the inner wall having the discharge slit through which the lubricant is discharged, and the outer wall spaced apart from the inner wall, so that even when the power tool is driven to rotate the gears of the gearbox housing, the lubricant is stored in the lubricant storage portion So that it is not scattered in the gearbox housing regardless of the centrifugal force generated in the gear rotation. Therefore, the lubricant stored in the lubricant storage portion is introduced into the gear after the power tool stops driving.

1 is a perspective view illustrating a power tool according to an embodiment of the present invention,
Fig. 2 is a partially cutaway perspective view of the gearbox of the power tool of Fig. 1,
FIG. 3 is a perspective view showing the structure of the lubricant storage unit of FIG. 2,
Fig. 4 is a view showing a driving embodiment of the lubricant storage portion of Fig. 2,
5 is a view showing a modified example of the electric power tool of the present invention.

It should be understood that the specific details of the invention are set forth in the following description to provide a more thorough understanding of the present invention and that the present invention may be readily practiced without these specific details, It will be clear to those who have knowledge.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to FIGS. 1 to 5, and a description will be given centering on parts necessary for understanding the operation and operation according to the present invention.

FIG. 1 is a perspective view showing a power tool according to an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view of a gear box of the power tool of FIG. 1, and FIG. 3 is a perspective view showing the structure of the lubricant storage unit of FIG. And FIG. 4 is a view showing a driving embodiment of the lubricant storage unit of FIG.

As shown in these figures, the gear box 10 of the power tool according to the embodiment of the present invention includes a cylindrical gear box housing 100 having one side opened and a gear box housing 100 A planetary gear 170 fixed to the inside of the gearbox housing 100 to be meshed with the ring gear 120 and installed adjacent to the planetary gear 170; And a lubricant storage unit 300 for storing a lubricant to prevent lubricant from being scattered to the outside of the planetary gear 170 when the planetary gear 170 is rotated.

By providing the lubricant storage portion 300 in which the lubricant O is stored in the gear box housing 100 as described above, the centrifugal force generated due to the high-speed rotation of the planetary gear 170 when the power tool 1 is driven The lubricant O is prevented from being scattered to the outside of the gearbox housing 100 when the driving of the power tool 1 is stopped, The lubricating effect between the gears can be improved by being introduced into the gears. The gear box housing 100 is generally a cylindrical member having an opening formed in one side surface thereof and accommodates a plurality of planetary gears and a sun gear ring gear, do.

The ring gear 120 is a circular insulator generally disposed at the outermost portion of the gear box of the power tool. At this time, a sun gear 180 is disposed in the axial center of the ring gear 120, and a plurality of planetary gears 170 are engaged between the ring gear 120 and the sun gear 180.

The planetary gear 170 includes a first planetary gear 140 and a second planetary gear 160 disposed at predetermined intervals and is disposed between the first planetary gear 140 and the second planetary gear 160 A lubricant storage unit 300 is provided.

The lubricant storage unit 300 installed between the first planetary gear 140 and the second planetary gear 160 is configured to rotate the gears in the gearbox housing 100 when the driving of the power tool 1 is stopped, (O).

More specifically, when the power tool 1 is driven, when the gear box housing 100 rotates together with the gearbox housing 100, and the gearbox housing 100 is in a position parallel to the direction of gravity toward the inside of the gearbox housing 100, And the lubricant (O) To this end, the lubricant reservoir 300 includes at least one discharge slit 350 through which the lubricant O is discharged.

The discharge slit 350 may be formed to a size such that a predetermined lubricant O can be discharged into the gearbox housing 100 when the driving of the power tool 1 is stopped, The gear box housing 100 may be formed so that the lubricant O can be introduced into the gearbox housing 100 when the discharge slit 350 is in the gravity direction toward the inside of the gearbox housing 100, It is preferable that a dog is formed.

Hereinafter, although the discharge slits 350 are formed at intervals of 180 degrees in the present invention, the positions and shapes of the discharge slits 350 can be changed according to the conditions required in the invention.

The lubricant storage part 300 includes an inner wall 340 formed with the discharge slit 350, an outer wall 360 spaced apart from the inner wall 340, and an inner wall 340 formed between the inner wall 340 and the outer wall 360 And a storage groove (380) in which the lubricant (O) is stored.

The lubricant storage portion 300 is formed in a donut shape and the outer wall 360 and the inner wall 340 are formed to have a predetermined height so that the lubricant O is easily stored in the storage groove 380 .

Particularly, a surface of the lubricant storage portion 300 facing the secondary planetary gears 1130 is sealed, and the other surface facing the primary planetary gears 140 is formed to be open. Generally, the lubricant O stored in the lubricant storage unit 300 has a viscosity property, so that the lubricant O does not flow or discharge through the opened other surface. Since the other surface of the lubricant storage unit 300 is opened as described above, the lubricant O can be stored in the lubricant storage unit 300 more easily because the lubricant O can be stored through the opened surface.

4, the lubricant O may flow into the ring gear 120 and the planetary gears when the discharge slit 350 is perpendicular to the direction of gravity toward the interior of the gearbox housing 100. [ That is, it can be assumed that the driving slit 350, which is located adjacent to the upper side of the gear box housing 100, is in a direction perpendicular to the direction of gravitational force when the driving of the power tool 1 is stopped . The lubricant O stored in the storage groove 380 is discharged through the discharge slit 350 while the discharge slit 350 is in the direction perpendicular to the direction of gravity toward the interior of the gearbox housing 100, And then flows into the gears inside the housing 100.

That is, when the power tool 1 is driven, centrifugal force is generated while the planetary gear 170 of the gearbox housing 100 rotates at a high speed. If the lubricant O is scattered outside the planetary gear 170 due to the centrifugal force generated when the lubricant storage portion 300 is not stored, the lubricant O is not properly introduced into the gears, I can not. The lubricant O is stored in the lubricant storage portion 300 so that the lubricant O is prevented from being scattered into the gear box housing 100 due to the centrifugal force due to the rotation of the planetary gear 170, . The lubricant O stored in the lubricant storage unit 300 can be introduced into the gears inside the housing 100 by stopping the driving of the power tool 1. [

5 is a view showing a modified example of the power tool of the present invention.

Before describing FIG. 5 in detail, assuming that the reference numerals shown in FIG. 5 and the reference numerals shown in FIGS. 1 to 4 are the same, the detailed description will be omitted.

Referring to FIG. 5, the lubricant storage portion 400 of the modified example of the power tool of the present invention is provided between the gearbox housing 100 and the internal gear provided inside the gearbox housing 100. More specifically, the lubricant storage part 400 is an empty space between the gearbox housing 100 and the ring gear 120. When the electric tool 1 is rotated by storing the lubricant O in the empty space, And the lubricant O is injected into the gear box housing 100 from the gear portion 400.

A lubricant input hole 124 is formed in the ring gear 120 so that lubricant O can be injected into the gear box housing 100 from the lubricant input hole 124 when the power tool 1 is rotated have.

The lubricant input hole 124 is formed at a position not directly contacting the planetary gear 170 so that the lubricant injection hole 124 is blocked by the planetary gear 170 so that the lubricant O is introduced into the gear box housing 100 To prevent it from being injected.

By providing the lubricant storage portion 300 in which the lubricant O is stored in the gear box housing 100 as described above, the centrifugal force generated due to the high-speed rotation of the planetary gear 170 when the power tool 1 is driven The lubricant O is prevented from being scattered into the gear box housing 100 when the driving of the power tool 1 is stopped, The lubricating effect between the gears can be improved by being introduced into the gears. The lubricant storage portion 300 is formed to include the inner wall 340 formed with the discharge slit 350 through which the lubricant O is discharged and the outer wall 360 spaced apart from the inner wall 340, Since the lubricant O is stored in the lubricant storage portion 300 even if the gears of the gearbox housing 100 are driven to rotate, the lubricant O is not scattered in the gearbox housing 100 regardless of the centrifugal force generated in the gear rotation . Therefore, all of the lubricant O stored in the lubricant storage unit 300 can be introduced into the gear after the driving of the electric tool 1 is stopped.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

10: Power tool 100: Gear box housing
300: lubricant storage part 320: pin mounting hole
340: Inner wall 350: Discharge slit
360: outer wall 380: storage groove

Claims (4)

A gear box of a power tool provided inside a power tool body, which decelerates the rotational force of the motor to the tip tool side,
A cylindrical gear box housing having one side opened;
A ring gear fixed to the inside of the gear box housing and being an internal gear;
A planetary gear interposed between the ring gear and fixed to the inside of the gear box housing; And
And a lubricant storage portion provided adjacent to the planetary gear and storing the lubricant to prevent lubricant from being scattered to gears in the gearbox housing upon rotation of the planetary gear,
The lubricant reservoir includes at least one or more discharge slits into which the lubricant is introduced into the gears in the gearbox housing,
Wherein the lubricant is introduced into the gears inside the gearbox housing when the driving tool is stopped and the discharge slit is perpendicular to the gravity direction toward the inside of the gearbox housing. box. delete The method according to claim 1,
Wherein the lubricant storage portion includes:
An inner wall on which the discharge slit is formed,
An outer wall spaced apart from the inner wall,
Further comprising a storage groove formed between the inner wall and the outer wall and storing the lubricant. delete
KR1020150150256A 2015-10-28 2015-10-28 Gear box of a power tools KR101773914B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150150256A KR101773914B1 (en) 2015-10-28 2015-10-28 Gear box of a power tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150150256A KR101773914B1 (en) 2015-10-28 2015-10-28 Gear box of a power tools

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KR20170049763A KR20170049763A (en) 2017-05-11
KR101773914B1 true KR101773914B1 (en) 2017-09-04

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000254810A (en) * 1999-03-05 2000-09-19 Hitachi Koki Co Ltd Vibrating drill
JP2004058266A (en) 2002-05-22 2004-02-26 Atlas Copco Tools Ab Portable power tool with grease lubrication angle drive device
JP2009214226A (en) 2008-03-10 2009-09-24 Makita Corp Impact tool
JP2012076179A (en) * 2010-09-30 2012-04-19 Hitachi Koki Co Ltd Power tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000254810A (en) * 1999-03-05 2000-09-19 Hitachi Koki Co Ltd Vibrating drill
JP2004058266A (en) 2002-05-22 2004-02-26 Atlas Copco Tools Ab Portable power tool with grease lubrication angle drive device
JP2009214226A (en) 2008-03-10 2009-09-24 Makita Corp Impact tool
JP2012076179A (en) * 2010-09-30 2012-04-19 Hitachi Koki Co Ltd Power tool

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KR20170049763A (en) 2017-05-11

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