EP1584423A2 - Power tool - Google Patents
Power tool Download PDFInfo
- Publication number
- EP1584423A2 EP1584423A2 EP05251698A EP05251698A EP1584423A2 EP 1584423 A2 EP1584423 A2 EP 1584423A2 EP 05251698 A EP05251698 A EP 05251698A EP 05251698 A EP05251698 A EP 05251698A EP 1584423 A2 EP1584423 A2 EP 1584423A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- power tool
- discharge port
- air
- transmission mechanism
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
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Images
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
- B25F5/008—Cooling means
-
- 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 a power tool having a novel cooling arrangement.
- a conventional power tool has a fan disposed near to the motor so that the motor is easily cooled.
- the axis of the motor and the axis of the working piece form a certain angle which makes the transmission mechanism difficult to cool thereby resulting in the transmission mechanism reaching a high temperature during use.
- the present invention seeks to improve the cooling arrangement in a power tool by providing a fan which not only cools the motor but also cools the transmission mechanism.
- a power tool comprising:
- the power tool in an embodiment comprises a motor disposed in a housing, a transmission mechanism attached to the rotary shaft of the motor and a fan disposed on the motor.
- the housing near to the fan defines a first air discharge port.
- the housing outside the transmission mechanism defines a second air discharge port.
- An inner wall of the housing between the first air discharge port and the transmission mechanism forms an air baffle.
- the air baffle and the second air discharge port advantageously define a second flow path for cooling air generated by the fan to cool the transmission device.
- the housing typically consists of a motor-containing part contiguous with a transmission mechanism-containing part.
- the axis of the motor-containing part may be substantially perpendicular to the axis of the transmission mechanism-containing part.
- the first air discharge port may be contained in the motor-containing part.
- the second air discharge port may be contained in the transmission mechanism-containing part.
- the transmission mechanism-containing part may be multiply ribbed.
- the motor-containing part is adapted externally to be used as a handle.
- the transmission mechanism-containing part is adapted at an end to mount the cutting element externally.
- the air baffle is an elongate interior wall of the housing.
- the second air discharge port is disposed in the housing at a position effectively coincident with the intersection of the axis of the rotary motor and the axis of the transmission mechanism.
- the second air discharge port is a plurality of discrete air vents which are disposed circumferentially in the housing in close proximity to the transmission mechanism.
- the discrete air vents are substantially evenly disposed circumferentially in the housing in close proximity to the transmission mechanism.
- the cooling air advantageously flows out uniformly from the second air discharge port and carries away heat from the transmission mechanism evenly.
- the discrete air vents are disposed circumferentially in the housing in a plane containing the intersection of the axis of the rotary motor and the axis of the transmission mechanism.
- the discrete air vents are disposed circumferentially in the housing in a plane substantially containing the axis of the air baffle.
- the discrete air vents are each disposed at the end of an axial rib in the exterior surface of the housing.
- the first discharge port is disposed in at least a part of a portion of the housing which is substantially coplanar with the fan.
- the first air discharge port is disposed in at least a part of a portion of the housing which is substantially coaxial with the fan.
- the first air discharge port skirts the fan.
- the transmission mechanism comprises:
- the elongate output shaft is downstream from the rotary gear wheel in the second flow path.
- the second air discharge port is disposed in at least a part of a portion of the housing which is substantially coplanar with the elongate output shaft.
- the second air discharge port is disposed in at least a part of a portion of the housing which is substantially coaxial with the elongate output shaft.
- the second air discharge port skirts the elongate output shaft.
- the first air discharge port may be a grille or mesh.
- the fan may be mounted coaxially on the rotary motor.
- the air baffle extends from the first air discharge port to the second air discharge port.
- the axis of the air baffle may be substantially parallel to the axis of the motor-containing part of the housing.
- the power tool may be a power drill or the like.
- a power tool comprises generally a housing 3, a rotary motor 9 disposed in the housing 3 and a transmission mechanism 8 attached to a rotary shaft of the rotary motor 9.
- the transmission mechanism 8 comprises a rotary gear wheel 8a intermeshed with the rotary shaft and an elongate output shaft 7 extending from the rotary gear wheel 8a to a cutting element (not shown).
- the angle between the axis of the rotary motor 9 and the axis of the cutting element is obtuse.
- the housing consists of a motor-containing part 3b contiguous with a transmission mechanism-containing part 3a which is multiply ribbed.
- the motor-containing part 3b is adapted externally to be used as a handle.
- the transmission mechanism-containing part 3a is adapted at an end 300 to mount the cutting element externally.
- a fan 2 is integrally and coaxially disposed on the rotary motor 9.
- the housing 3 near to the fan 2 defines a first air discharge port 1 in the form of a grille contained in the motor-containing part 3b and the housing 3 defines a second air discharge port 4 contained in the transmission mechanism-containing part 3a outside the transmission mechanism 8.
- the second air discharge port 4 is a plurality of discrete air vents evenly arranged at the end of an axial rib in the housing 3 outside the transmission mechanism 8.
- An inner wall of the housing 3 between the first air discharge port 1 and the transmission mechanism 8 forms an air baffle 6.
- the air baffle 6 serves to direct air along a path from the fan 2 to the second air discharge port 4.
- the rotary motor 9 is readily cooled due to the close proximity of the fan 2 and of the first air discharge port 1. Meanwhile, the flow of cooling air from the fan 2 to the second air discharge port 4 cools the transmission mechanism 8.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Portable Power Tools In General (AREA)
Abstract
Description
- The present invention relates to a power tool having a novel cooling arrangement.
- A conventional power tool has a fan disposed near to the motor so that the motor is easily cooled. However, in some power tools, the axis of the motor and the axis of the working piece form a certain angle which makes the transmission mechanism difficult to cool thereby resulting in the transmission mechanism reaching a high temperature during use.
- The present invention seeks to improve the cooling arrangement in a power tool by providing a fan which not only cools the motor but also cools the transmission mechanism.
- Viewed from a first aspect the present invention provides a power tool comprising:
- a housing;
- a rotary motor disposed in the housing and having a rotary shaft;
- a transmission mechanism in engagement with the rotary shaft;
- a fan for generating an airflow mounted radially on the rotary motor, wherein the housing near to the fan defines a first air discharge port for discharging air at the end of a first flow path and wherein the housing in close proximity to the transmission mechanism defines a second air discharge port for discharging air at the end of a second flow path, wherein an air baffle between the first air discharge port and the transmission mechanism is adapted to direct air along the second flow path, wherein the air directed along the second flow path serves to cool the transmission mechanism in use.
-
- The power tool in an embodiment comprises a motor disposed in a housing, a transmission mechanism attached to the rotary shaft of the motor and a fan disposed on the motor. The housing near to the fan defines a first air discharge port. The housing outside the transmission mechanism defines a second air discharge port. An inner wall of the housing between the first air discharge port and the transmission mechanism forms an air baffle.
- The air baffle and the second air discharge port advantageously define a second flow path for cooling air generated by the fan to cool the transmission device.
- The housing typically consists of a motor-containing part contiguous with a transmission mechanism-containing part. The axis of the motor-containing part may be substantially perpendicular to the axis of the transmission mechanism-containing part. The first air discharge port may be contained in the motor-containing part. The second air discharge port may be contained in the transmission mechanism-containing part. The transmission mechanism-containing part may be multiply ribbed. The motor-containing part is adapted externally to be used as a handle. The transmission mechanism-containing part is adapted at an end to mount the cutting element externally.
- Preferably the air baffle is an elongate interior wall of the housing.
- Preferably the second air discharge port is disposed in the housing at a position effectively coincident with the intersection of the axis of the rotary motor and the axis of the transmission mechanism.
- Preferably the second air discharge port is a plurality of discrete air vents which are disposed circumferentially in the housing in close proximity to the transmission mechanism. Particularly preferably the discrete air vents are substantially evenly disposed circumferentially in the housing in close proximity to the transmission mechanism. In this embodiment, the cooling air advantageously flows out uniformly from the second air discharge port and carries away heat from the transmission mechanism evenly.
- Particularly preferably the discrete air vents are disposed circumferentially in the housing in a plane containing the intersection of the axis of the rotary motor and the axis of the transmission mechanism. Particularly preferably the discrete air vents are disposed circumferentially in the housing in a plane substantially containing the axis of the air baffle. Particularly preferably the discrete air vents are each disposed at the end of an axial rib in the exterior surface of the housing.
- Preferably the first discharge port is disposed in at least a part of a portion of the housing which is substantially coplanar with the fan.
- Preferably the first air discharge port is disposed in at least a part of a portion of the housing which is substantially coaxial with the fan.
- Preferably the first air discharge port skirts the fan.
- In a preferred embodiment, the transmission mechanism comprises:
- a rotary gear wheel intermeshed with the rotary shaft; and
- an elongate output shaft extending from the rotary gear wheel to a cutting element. Typically the angle between the axis of the rotary motor and the axis of the cutting element (and the transmission mechanism) is obtuse.
-
- Preferably the elongate output shaft is downstream from the rotary gear wheel in the second flow path.
- Preferably the second air discharge port is disposed in at least a part of a portion of the housing which is substantially coplanar with the elongate output shaft.
- Preferably the second air discharge port is disposed in at least a part of a portion of the housing which is substantially coaxial with the elongate output shaft.
- Preferably the second air discharge port skirts the elongate output shaft.
- The first air discharge port may be a grille or mesh.
- The fan may be mounted coaxially on the rotary motor.
- Typically the air baffle extends from the first air discharge port to the second air discharge port. The axis of the air baffle may be substantially parallel to the axis of the motor-containing part of the housing.
- The power tool may be a power drill or the like.
- The present invention will now be described in a non-limitative sense with reference to the accompanying Figures in which:
- Figure 1 is a perspective view of an embodiment of the power tool of the present invention;
- Figure 2 is a partial view of the internal structure of the embodiment of the power tool of the present invention.
-
- Referring to Figures 1 and 2, a power tool comprises generally a
housing 3, arotary motor 9 disposed in thehousing 3 and atransmission mechanism 8 attached to a rotary shaft of therotary motor 9. Thetransmission mechanism 8 comprises a rotary gear wheel 8a intermeshed with the rotary shaft and anelongate output shaft 7 extending from the rotary gear wheel 8a to a cutting element (not shown). The angle between the axis of therotary motor 9 and the axis of the cutting element is obtuse. - The housing consists of a motor-containing part 3b contiguous with a transmission mechanism-containing part 3a which is multiply ribbed. The motor-containing part 3b is adapted externally to be used as a handle. The transmission mechanism-containing part 3a is adapted at an
end 300 to mount the cutting element externally. - A
fan 2 is integrally and coaxially disposed on therotary motor 9. Thehousing 3 near to thefan 2 defines a firstair discharge port 1 in the form of a grille contained in the motor-containing part 3b and thehousing 3 defines a secondair discharge port 4 contained in the transmission mechanism-containing part 3a outside thetransmission mechanism 8. Referring to Figure 1, the secondair discharge port 4 is a plurality of discrete air vents evenly arranged at the end of an axial rib in thehousing 3 outside thetransmission mechanism 8. - An inner wall of the
housing 3 between the firstair discharge port 1 and thetransmission mechanism 8 forms an air baffle 6. The air baffle 6 serves to direct air along a path from thefan 2 to the secondair discharge port 4. - During operation of the power tool, the
rotary motor 9 is readily cooled due to the close proximity of thefan 2 and of the firstair discharge port 1. Meanwhile, the flow of cooling air from thefan 2 to the secondair discharge port 4 cools thetransmission mechanism 8.
Claims (15)
- A power tool comprising:a housing (3);a rotary motor (9) disposed in the housing (3) and having a rotary shaft;a transmission mechanism (8) in engagement with the rotary shaft;a fan (2) for generating an airflow mounted radially on the rotary motor (9),
- A power tool as claimed in claim 1 wherein the air baffle (6) is an elongate interior wall of the housing (3).
- A power tool as claimed in claim 1 or 2 wherein the second air discharge port (4) is disposed in the housing (3) at a position effectively coincident with the intersection of the axis of the rotary motor (9) and the axis of the transmission mechanism (8).
- A power tool as claimed in any preceding claim wherein the second air discharge port (4) is a plurality of discrete air vents which are disposed circumferentially in the housing (3) in close proximity to the transmission mechanism (8).
- A power tool as claimed in claim 4 wherein the discrete air vents are substantially evenly disposed circumferentially in the housing (3) in close proximity to the transmission mechanism (8).
- A power tool as claimed in claim 4 or 5 wherein the discrete air vents are disposed circumferentially in the housing (3) in a plane containing the intersection of the axis of the rotary motor (9) and the axis of the transmission mechanism (8).
- A power tool as claimed in claim 4, 5 or 6 wherein the discrete air vents are disposed circumferentially in the housing (3) in a plane substantially containing the axis of the air baffle (6).
- A power tool as claimed in any preceding claim wherein the first discharge port (1) is disposed in at least a part of a portion of the housing (3) which is substantially coplanar with the fan (2).
- A power tool as claimed in any preceding claim wherein the first air discharge port (1) is disposed in at least a part of a portion of the housing (3) which is substantially coaxial with the fan (2).
- A power tool as claimed in any preceding claim wherein the first air discharge port (1) skirts the fan (2).
- A power tool as claimed in any preceding claim wherein the transmission mechanism (8) comprises:a rotary gear wheel intermeshed with the rotary shaft; andan elongate output shaft (7) extending from the rotary gear wheel to a cutting element.
- A power tool as claimed in claim 11 wherein the elongate output shaft (7) is downstream from the rotary gear wheel in the second flow path.
- A power tool as claimed in claim 11 or 12 wherein the second air discharge port (4) is disposed in at least a part of a portion of the housing (3) which is substantially coplanar with the elongate output shaft (7).
- A power tool as claimed in claim 11, 12 or 13 wherein the second air discharge port (4) is disposed in at least a part of a portion of the housing (3) which is substantially coaxial with the elongate output shaft (7).
- A power tool as claimed in any of claims 11 to 14 wherein the second air discharge port (4) skirts the elongate output shaft (7).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNU2004200257489U CN2688454Y (en) | 2004-03-25 | 2004-03-25 | Cooling structure of electric tool |
CN200420025748 | 2004-03-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1584423A2 true EP1584423A2 (en) | 2005-10-12 |
EP1584423A3 EP1584423A3 (en) | 2005-10-19 |
Family
ID=34669993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05251698A Withdrawn EP1584423A3 (en) | 2004-03-25 | 2005-03-21 | Power tool |
Country Status (3)
Country | Link |
---|---|
US (1) | US20050230134A1 (en) |
EP (1) | EP1584423A3 (en) |
CN (1) | CN2688454Y (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2086727A1 (en) * | 2006-12-01 | 2009-08-12 | Atlas Copco Tools AB | Pneumatic power tool with air cooling system |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004055268A1 (en) * | 2004-11-17 | 2006-05-18 | Robert Bosch Gmbh | Hand tool |
DE102006000084A1 (en) * | 2006-02-20 | 2007-08-23 | Hilti Ag | Electric hand tool comprises openings provided on a separating element for releasing a delimited cord passage region from a pressure region in the suction region |
DE102010004724A1 (en) * | 2010-01-15 | 2011-07-21 | Wacker Neuson SE, 80809 | Drilling and / or hammer with cooling of device components |
JP5836621B2 (en) * | 2011-03-31 | 2015-12-24 | 株式会社マキタ | Power tools |
US20130299207A1 (en) * | 2012-05-10 | 2013-11-14 | Black & Decker, Inc. | Power tool cooling |
JP6085225B2 (en) | 2013-06-27 | 2017-02-22 | 株式会社マキタ | Screw tightening electric tool |
USD725981S1 (en) | 2013-10-29 | 2015-04-07 | Black & Decker Inc. | Screwdriver with nosepiece |
US20150151424A1 (en) | 2013-10-29 | 2015-06-04 | Black & Decker Inc. | Power tool with ergonomic handgrip |
TW201534442A (en) * | 2014-03-12 | 2015-09-16 | bo-hong Chen | Heat dissipation structure of powered hand tool |
US20210001465A1 (en) * | 2019-07-04 | 2021-01-07 | Griot's Garage, Inc. | Eccentric mechanism and power tool provided with the eccentric mechanism |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2155082A (en) * | 1937-03-23 | 1939-04-18 | Black & Decker Mfg Co | Portable electric tool and casing |
US3003073A (en) * | 1959-03-20 | 1961-10-03 | Black & Decker Mfg Co | Cooling means for portable electric tool |
EP0794038A2 (en) * | 1996-01-08 | 1997-09-10 | Kress-elektrik GmbH + Co. Elektromotorenfabrik | Hand tool with cooling arrangement |
US6127751A (en) * | 1998-09-02 | 2000-10-03 | Hilti Aktiengesellschaft | Electric tool |
CH692488A5 (en) * | 1996-02-06 | 2002-07-15 | Bosch Gmbh Robert | Hand tool with a header. |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2844086A1 (en) * | 1978-10-10 | 1980-04-30 | Bosch Gmbh Robert | HAND MACHINE, IN PARTICULAR HAMMER |
DE3824234A1 (en) * | 1988-07-16 | 1990-01-25 | Bosch Gmbh Robert | HAND MACHINE TOOL WITH DRAFT VENTILATED DRIVE MOTOR |
DE19631517A1 (en) * | 1996-08-03 | 1998-02-05 | Wacker Werke Kg | Variable-speed, hand-held power tool driven by an electric motor that can be connected to single-phase alternating current |
DE19924552A1 (en) * | 1999-05-28 | 2000-11-30 | Hilti Ag | Electrically powered hand device e.g. electric screwdriver, has cooling air channel arranged downstream of electric motor and gearbox with outflow openings arranged to direct heated air away from user |
DE10156387B8 (en) * | 2001-11-16 | 2008-07-24 | Robert Bosch Gmbh | Hand tool with air inlet or air outlet openings in the housing |
JP3890970B2 (en) * | 2001-12-14 | 2007-03-07 | 日立工機株式会社 | Electric tool |
JP4075540B2 (en) * | 2002-09-10 | 2008-04-16 | 松下電工株式会社 | Electric tool |
DE10261572A1 (en) * | 2002-12-23 | 2004-07-01 | Robert Bosch Gmbh | Electric hand tool machine e.g. drill, has arrangement for generating additional cooling air flow that passes at least one machine component outside or in low flow region of cooling air flow |
-
2004
- 2004-03-25 CN CNU2004200257489U patent/CN2688454Y/en not_active Expired - Lifetime
-
2005
- 2005-03-21 EP EP05251698A patent/EP1584423A3/en not_active Withdrawn
- 2005-03-24 US US11/088,690 patent/US20050230134A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2155082A (en) * | 1937-03-23 | 1939-04-18 | Black & Decker Mfg Co | Portable electric tool and casing |
US3003073A (en) * | 1959-03-20 | 1961-10-03 | Black & Decker Mfg Co | Cooling means for portable electric tool |
EP0794038A2 (en) * | 1996-01-08 | 1997-09-10 | Kress-elektrik GmbH + Co. Elektromotorenfabrik | Hand tool with cooling arrangement |
CH692488A5 (en) * | 1996-02-06 | 2002-07-15 | Bosch Gmbh Robert | Hand tool with a header. |
US6127751A (en) * | 1998-09-02 | 2000-10-03 | Hilti Aktiengesellschaft | Electric tool |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2086727A1 (en) * | 2006-12-01 | 2009-08-12 | Atlas Copco Tools AB | Pneumatic power tool with air cooling system |
EP2086727A4 (en) * | 2006-12-01 | 2011-05-04 | Atlas Copco Tools Ab | Pneumatic power tool with air cooling system |
Also Published As
Publication number | Publication date |
---|---|
EP1584423A3 (en) | 2005-10-19 |
US20050230134A1 (en) | 2005-10-20 |
CN2688454Y (en) | 2005-03-30 |
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