Torque output tool

Patent metadata

Field	Value
Publication number	US-2023019359-A1
Application number	US-202217957039-A
Country	US
Kind code	A1
Filing date	Sep 30, 2022
Priority date	Jun 29, 2021
Publication date	Jan 19, 2023
Grant date	—

Abstract

A torque output tool includes an output shaft, a motor, a transmission assembly, and a gearbox. The gearbox is used for accommodating the transmission assembly. The transmission assembly includes a first planetary gearset and a second planetary gearset. The transmission assembly is capable of being switched to a first state and a second state such that the transmission assembly outputs a first gear ratio or a second gear ratio separately, where the first gear ratio is greater than the second gear ratio. When the transmission assembly outputs the first gear ratio, a rotational speed of the output shaft is greater than or equal to 300 r/min and less than or equal to 800 r/min. A length of the gearbox in an axial direction is greater than or equal to 38 mm and less than or equal to 46 mm.

First claim

What is claimed is:

1 . A torque output tool, comprising:
an output shaft for outputting torque; a motor for driving the output shaft to rotate around a first axis; a housing for supporting the motor; a transmission assembly for transmitting output of the motor to the output shaft; and a gearbox for accommodating at least a portion of the transmission assembly; wherein the transmission assembly comprises: a sun gear fixedly connected to the motor shaft; a first planetary gearset comprising first planet gears and a first planet carrier, wherein the first planet gears are driven by the motor, and the first planet carrier is used for mounting the first planet gears; and a second planetary gearset comprising second planet gears and a second planet carrier, wherein the second planet carrier is used for mounting the second planet gears; wherein the transmission assembly is capable of being switched to a first state and a second state such that the transmission assembly outputs a first gear ratio or a second gear ratio separately, and the first gear ratio is greater than the second gear ratio; wherein the motor comprises: a motor shaft that rotates around the first axis; wherein each of the first planet gears comprises: an external engagement portion that forms external engagement with the sun gear; and an internal engagement portion fixedly connected to the external engagement portion; and wherein a length of the gearbox in an axial direction of the first axis is greater than or equal to 38 mm and less than or equal to 46 mm.

2 . The torque output tool of claim 1 , wherein the transmission assembly comprises a first-stage internal ring gear that forms internal engagement with the internal engagement portion, and a projection of the first-stage internal ring gear in a radial direction of the first axis at least partially overlaps with a projection of the internal engagement portion in the radial direction of the first axis.

3 . The torque output tool of claim 2 , wherein the external engagement portion comprises an external engagement post, the internal engagement portion comprises an internal engagement post, and on a plane perpendicular to the first axis, a cross-sectional area of the external engagement post is greater than a cross-sectional area of the internal engagement post.

4 . The torque output tool of claim 3 , wherein the transmission assembly comprises a second-stage internal ring gear engaged with the second planet gears and a lock, the second-stage internal ring gear comprises a plurality of bumps, the lock comprises locking teeth that mate with the plurality of bumps, the lock is capable of moving to at least a first position and a second position, the locking teeth and the plurality of bumps are staggered in a circumferential direction of the first axis when the lock is at the first position, and the locking teeth and the plurality of bumps are disengaged in the circumferential direction of the first axis when the lock is at the second position.

5 . The torque output tool of claim 4 , further comprising a toggle switch disposed on the housing and used for switching the lock to the first position or the second position; and a link that penetrates through the gearbox and connects the toggle switch to the lock.

6 . The torque output tool of claim 1 , wherein a gear ratio outputted by the first planetary gearset is greater than or equal to 10 and less than or equal to 18.

7 . The torque output tool of claim 1 , wherein, when the transmission assembly outputs the first gear ratio, a rotational speed of the output shaft is greater than or equal to 300 r/min and less than or equal to 800 r/min.

8 . The torque output tool of claim 1 , further comprising a torque adjustment ring sleeved on a front end of the gearbox and capable of moving forward and backward on the gearbox, an elastic member support connected to the torque adjustment ring, and an elastic member disposed on the elastic member support, wherein the elastic member support is at least partially sleeved on the torque adjustment ring such that the elastic member support at least partially overlaps with the torque adjustment ring in the radial direction of the first axis.

9 . The torque output tool of claim 1 , wherein the motor comprises a stator assembly and a rotor assembly, the rotor assembly comprises a rotor sleeve and permanent magnets, the permanent magnets are mounted on the rotor sleeve, the rotor sleeve is configured to be sleeved outside the stator assembly, and an output rotational speed of the motor is greater than or equal to 6400 r/min and less than or equal to 30000 r/min.

10 . The torque output tool of claim 9 , wherein the first gear ratio is greater than or equal to 16 and less than or equal to 36.

11 . The torque output tool of claim 1 , wherein the housing comprises a head housing in which the motor and the transmission assembly are disposed; and a grip connected to the head housing and used for a user to hold; wherein a length of the head housing in the axial direction of the first axis is configured to be greater than or equal to 80 mm and less than or equal to 120 mm.

12 . A torque output tool, comprising:
an output shaft for outputting torque; a motor for driving the output shaft to rotate around a first axis; a transmission assembly for transmitting output of the motor to the output shaft; and a gearbox for accommodating at least a portion of the transmission assembly; wherein the transmission assembly comprises: a first planetary gearset comprising first planet gears and a first planet carrier, wherein the first planet gears are driven by the motor, and the first planet carrier is used for mounting the first planet gears; and a second planetary gearset comprising second planet gears and a second planet carrier, wherein the second planet carrier is used for mounting the second planet gears; wherein the transmission assembly is capable of being switched to a first state and a second state such that the transmission assembly outputs a first gear ratio or a second gear ratio separately, and the first gear ratio is greater than the second gear ratio; wherein when the transmission assembly outputs the first gear ratio, a rotational speed of the output shaft is greater than or equal to 300 r/min and less than or equal to 800 r/min; and wherein a length of the gearbox in an axial direction of the first axis is greater than or equal to 38 mm and less than or equal to 46 mm.

13 . The torque output tool of claim 12 , wherein the motor comprises a motor shaft that rotates around the first axis; the transmission assembly comprises a sun gear fixedly connected to the motor shaft; and a first planet gear of the first planet gears comprises an external engagement portion that forms external engagement with the sun gear and an internal engagement portion fixedly connected to the external engagement portion.

14 . The torque output tool of claim 13 , wherein the transmission assembly comprises a first-stage internal ring gear that forms internal engagement with the internal engagement portion, wherein a projection of the first-stage internal ring gear in a radial direction of the first axis at least partially overlaps with a projection of the internal engagement portion in the radial direction of the first axis.

15 . The torque output tool of claim 14 , wherein the external engagement portion comprises an external engagement post, the internal engagement portion comprises an internal engagement post, and on any plane perpendicular to the first axis, a cross-sectional area of the external engagemen

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Li Chunrui
• Tong Shubin
• Wang Hejun
• Zheng Hanqing

Classifications

• B25B21/007

  Attachments for drilling apparatus for screw or nut setting or loosening · CPC title

• B25B21/008

  with automatic change-over from high speed-low torque mode to low speed-high torque mode · CPC title

• B25F5/001 Primary

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

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• B25B21/00

  Portable power-driven screw or nut setting or loosening tools; (details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; {for mounting or dismounting wheels B60B29/006}); Attachments for drilling apparatus serving the same purpose (machines B23P19/06) · CPC title