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CN-224229186-U - Multi-stage transmission mechanism for electric tool and electric tool

CN224229186UCN 224229186 UCN224229186 UCN 224229186UCN-224229186-U

Abstract

The application discloses a multi-stage transmission mechanism for an electric tool and the electric tool, which comprise a shell, a motor, a first-stage speed reduction unit, a second-stage speed reduction unit and a third-stage speed reduction unit, wherein the motor is provided with a driving shaft, a first-stage driving gear is arranged at the end part of the driving shaft, the first-stage speed reduction unit comprises a first-stage output shaft, a second-stage driving gear and a first-stage driven gear, the first-stage driven gear is meshed with the first-stage driving gear, the second-stage speed reduction unit comprises a second-stage output shaft, a third-stage driving gear and a second-stage driven gear, the second-stage driving gear is meshed with the second-stage driven gear, the third-stage speed reduction unit comprises a third-stage output shaft and a third-stage driven gear, the third-stage driving gear is meshed with the third-stage driven gear, the third-stage output shaft can form a power output end of the electric tool, the second-stage driving gear and the third-stage driving gear are identical in size and parameters, and the first-stage output shaft and the second-stage output shaft are identical in size and parameters.

Inventors

  • Jin Luxiang

Assignees

  • 永康市精泳工贸有限公司

Dates

Publication Date
20260512
Application Date
20250716

Claims (10)

  1. 1. A multi-stage transmission for a power tool, comprising: A housing; the motor is provided with a driving shaft, and a primary driving gear is arranged at the end part of the driving shaft; The primary speed reduction unit comprises a primary output shaft, a secondary driving gear and a primary driven gear, and the primary driven gear is meshed with the primary driving gear; the secondary speed reduction unit comprises a secondary output shaft, a tertiary driving gear and a secondary driven gear, and the secondary driving gear is meshed with the secondary driven gear; The three-stage speed reduction unit comprises a three-stage output shaft and a three-stage driven gear, the three-stage driving gear is meshed with the three-stage driven gear, and the three-stage output shaft can form a power output end of the electric tool; The size and the parameters of the primary output shaft and the secondary output shaft are completely the same, and the size and the parameters of the secondary driven gear and the tertiary driven gear are completely the same; The shell is provided with a first sealing structure and a second sealing structure on the driving shaft and the three-stage output shaft respectively.
  2. 2. The multi-stage transmission mechanism for a power tool as claimed in claim 1, wherein the drive shaft is arranged perpendicularly to the primary output shaft, and the primary drive gear and the first driven gear are bevel gears.
  3. 3. The multi-stage transmission mechanism for a power tool as claimed in claim 1, wherein the secondary drive gear is integrally formed with the primary output shaft and forms a first gear shaft, and the tertiary drive gear is integrally formed with the secondary output shaft and forms a second gear shaft.
  4. 4. The multi-stage transmission mechanism for a power tool of claim 1, wherein the primary output shaft and the secondary output shaft are each provided with a key slot for receiving a key for transmitting torque.
  5. 5. The multi-stage transmission mechanism for a power tool according to claim 1, wherein each of the primary output shaft, the secondary output shaft, and the tertiary output shaft is provided with a stopper ring, the primary driven gear is located between the stopper ring and the secondary driving gear and is restrained from axial movement, and the secondary driven gear is located between the stopper ring and the tertiary driving gear and is restrained from axial movement.
  6. 6. The multi-stage transmission mechanism for a power tool according to claim 5, wherein a bearing is provided on the housing, an abutment portion is formed on one side of the three-stage driven gear and the two-stage transmission gear, the abutment portion abuts against an inner ring of the bearing, and the three-stage driven gear is located between the retainer ring and the bearing and is restrained from axial movement.
  7. 7. The multi-stage transmission mechanism for a power tool as recited in claim 6, wherein the abutment is annular in cross-sectional profile and defines a receiving cavity.
  8. 8. The multi-stage transmission mechanism for a power tool as claimed in claim 1, wherein the first sealing structure comprises an O-ring mounted on the drive shaft via a flange for pressing a bearing mounted on the drive shaft, and a first skeleton oil seal provided in the flange for sealing the drive shaft.
  9. 9. The multi-stage transmission mechanism for a power tool according to claim 1, wherein the second sealing structure comprises a labyrinth seal, which is a non-contact labyrinth seal, provided on the three-stage output shaft, and a second skeleton oil seal provided on the three-stage output shaft for sealing the three-stage output shaft.
  10. 10. A power tool having a multi-stage transmission mechanism for a power tool as claimed in any one of claims 1 to 9.

Description

Multi-stage transmission mechanism for electric tool and electric tool Technical Field The application relates to the technical field of electric tools, in particular to a multi-stage transmission mechanism for an electric tool and the electric tool. Background In the field of power tools, particularly in cutters, wall cutters and the like having saw blade diameters greater than 500mm, low-speed transmission mechanisms are required for high torque output. Because a large amount of water, dust, slurry and the like exist in the working environment of the cutting machine, the wall cutting machine and the like, the rationality of the design of the transmission mechanism and the reliability of sealing directly determine the average failure rate of the whole machine. The prior multi-stage transmission mechanism, such as the transmission mechanism of the CN222798094U for the electric tool and the electric tool with the transmission mechanism, has compact structure, can save installation space, simplify the structure of the transmission mechanism and reduce cost, but for partial electric tools, the two-stage transmission mechanism can not meet the use requirement, the prior three-stage transmission mechanism needs more gears and transmission shafts, the arrangement problem of the prior three-stage transmission mechanism causes various kinds of gears and transmission shafts, the management and the installation are difficult, and the maintenance cost is high, so the problem is solved. The foregoing is provided merely for the purpose of facilitating understanding of the application and is not intended to represent the closest prior art to which the application pertains. Disclosure of Invention Based on the above, the present application provides a multi-stage transmission mechanism for a power tool and a power tool, which solve one of the above technical problems. The technical scheme includes that the multistage transmission mechanism for the electric tool comprises a shell, a motor, a first-stage reduction unit, a second-stage reduction unit, a third-stage reduction unit and a third-stage reduction unit, wherein the motor is provided with a driving shaft, a first-stage driving gear is arranged at the end part of the driving shaft, the first-stage reduction unit comprises a first-stage output shaft, a second-stage driving gear and a first-stage driven gear, the first-stage driven gear is meshed with the first-stage driving gear, the second-stage reduction unit comprises a second-stage output shaft, a third-stage driving gear and a second-stage driven gear, the second-stage driving gear is meshed with the second-stage driven gear, the third-stage driving gear is meshed with the third-stage driven gear, the third-stage output shaft can form a power output end of the electric tool, the second-stage driving gear and the third-stage driving gear are identical in size and parameter, the first sealing structure and the second sealing structure are respectively arranged on the driving shaft and the third-stage output shaft. In some embodiments, the drive shaft is disposed perpendicular to the primary output shaft, and the primary drive gear and the first driven gear are bevel gears. In some embodiments, the secondary drive gear is integrally formed with the primary output shaft and forms a first gear shaft, and the tertiary drive gear is integrally formed with the secondary output shaft and forms a second gear shaft. In some embodiments, the primary output shaft and the secondary output shaft are provided with keyways for placing keys to transmit torque. In some embodiments, the primary output shaft, the secondary output shaft and the tertiary output shaft are all provided with limiting snap rings, the primary driven gear is located between the limiting snap rings and the secondary driving gear and is limited to axially move, and the secondary driven gear is located between the limiting snap rings and the tertiary driving gear and is limited to axially move. In some embodiments, a bearing is arranged on the shell, an abutting part is formed on one side of the three-stage driven gear and one side of the two-stage transmission gear, the abutting part abuts against the inner ring of the bearing, and the three-stage driven gear is positioned between the limiting snap ring and the bearing and is limited to axially move. In some embodiments, the abutment cross-sectional profile is annular and forms a receiving cavity. The first sealing structure comprises an O-shaped sealing ring which is arranged on the driving shaft through a flange and is also used for compressing a bearing arranged on the driving shaft, and a first framework oil seal which is arranged in the flange and is used for sealing the driving shaft. In some embodiments, the second sealing structure comprises a labyrinth sealing ring, a second framework oil seal and a third-stage output shaft, wherein the labyrinth sealing ring is a non-contact labyrinth sealing ring an