Hand-Held Power Tool

Patent metadata

Field	Value
Publication number	US-2021170560-A1
Application number	US-201816613789-A
Country	US
Kind code	A1
Filing date	Jun 1, 2018
Priority date	Jun 12, 2017
Publication date	Jun 10, 2021
Grant date	—

Abstract

A system includes first and second power tools that each have a percussion mechanism, a motor, and a transmission. The transmission includes a striking mechanism and is configured to transfer a driving motion of the motor to an insert tool held in a tool holder. The transmission has a guide tube that is identical in some regions along a working axis and accommodates a striker. The guide tube is rotatably coupled to the motor by a first transmission unit. The striker is driven to linearly oscillate by a piston of a second transmission unit. A ratio between a diameter of the tool holder and a diameter of the guide tube is 1.8 times greater in the first power tool than in the second power tool. A striking energy of the second power tool is mechanically reduced compared to a striking energy of the first power tool.

First claim

1 . A system, comprising:
a first hand-held power tool and a second hand-held power tool, the first and second hand-held power tools each having a percussion mechanism, a motor, and a transmission that includes the percussion mechanism and that is configured to transmit a driving motion of the motor to an insert tool accommodated in a tool receiver, wherein the respective transmissions each have a guide tube that is identical in regions along a working axis and in which a striker is carried in an axially movable manner, herein the guide tube rotatably coupled to the motor via a first transmission unit, the striker configured to be driven in a linearly oscillating manner via a piston of a second transmission unit, wherein a ratio between a diameter of the tool receiver and a diameter of the guide tube of the first hand-held power tool is 1.8 times greater than a ratio between a diameter of the tool receiver and a diameter of the guide tube of the second hand-held power tool, and wherein a single-strike energy of the second hand-held power tool is mechanically reduced in comparison with a single-strike energy of the first hand-held power tool.

2 . The system as claimed in claim 1 , wherein a first crank stroke of the second transmission unit of the second hand-held power tool is reduced in comparison with a second crank stroke of the second transmission unit of the first hand-held power tool.

3 . The system as claimed in claim 1 , wherein the respective pistons of the first and second hand-held power tools are driven via respective eccentric units, and wherein an eccentricity of the eccentric unit of the second hand-held power tool is less than an eccentricity of the eccentric unit of the first hand-held power tool.

4 . The system as claimed in claim 1 , wherein a first air-spring length of the percussion mechanism of the first hand-held power tool differs from a second air-spring length of the percussion mechanism of the second hand-held power tool.

5 . The system as claimed in claim 1 , wherein a bearing distance of the percussion mechanism of the first hand-held power tool is equal to a bearing distance of the percussion mechanism of the second hand-held power tool.

6 . The system as claimed in claim 1 , wherein a strike point of the first hand-held power tool is the same as a strike point of the second hand-held power tool.

7 . The system as claimed in claim 1 , wherein the first and second hand-held power tools each have a B percussion damping system that are identical to each other.

8 . The system as claimed in claim 1 , wherein the first and second hand-held power tools each have a transmission housing, and wherein mechanical components within each transmission housing are at least 80% identical.

9 . The system as claimed in claim 1 , wherein a diameter of the tool receiver of the second hand-held power tool is under 18 mm, and wherein the ratio between a diameter of the guide tube and the diameter of the tool receiver of the second hand-held power tool lies in a range of between 2.8 and 3.4.

10 . A hand-held power tool, having comprising:
a percussion mechanism; a motor; and a transmission that includes the percussion mechanism and that is configured to transmit a driving motion of the motor to an insert tool accommodated in a tool receiver, wherein the transmission has a guide tube in which a striker is carried in an axially movable manner, the guide tube is rotatably coupled to the motor via a first transmission unit, the striker configured to be driven in a linearly oscillating manner via a piston of a second transmission unit, and wherein a ratio between a diameter of the guide tube and a diameter of the tool receiver lies in a range of between 2.8 and 3.4.

11 . The hand-held power tool as claimed in claim 10 , wherein the diameter of the tool receiver is under 18 mm.

12 . The system as claimed in claim 2 , wherein the first crank stroke is reduced by 20% in comparison with the second crank stroke.

13 . The system as claimed in claim 4 , wherein the first air-spring length is greater than the second air-spring length.

14 . The system as claimed in claim 9 , wherein the diameter of the tool receiver of the second hand-held power tool is 10 mm, and wherein the ratio between the diameter of the guide tube and the diameter of the tool receiver of the second hand-held power tool lies in a range of between 2.9 and 3.1.

15 . The hand-held power tool as claimed in claim 10 , wherein the ratio between the diameter of the guide tube and the diameter of the tool receiver lies in a range of between 2.9 and 3.1.

16 . The hand-held power tool as claimed in claim 11 , wherein the diameter of the tool receiver is 10 mm.

Assignees

• Bosch Gmbh Robert

Inventors

• Kurz Andre
• Brinkmann Thomas
• Schmid Lars
• Schmitz Pascal
• Schmid Hardy
• Heinen Patrick
• Koalick Jan

Classifications

• B25F5/001 Primary

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• B25D2250/275

  Tools having at least two similar components · CPC title

• B25D2217/0019

  Guide-sleeves · CPC title

• B25D2211/003

  Crossed drill and motor spindles · CPC title

• B25D17/084

  Rotating chucks or sockets · CPC title