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CN-113021272-B - Electric hammer

CN113021272BCN 113021272 BCN113021272 BCN 113021272BCN-113021272-B

Abstract

The invention discloses an electric hammer which comprises a motor, an output shaft, a motion conversion mechanism, an impact mechanism, a supporting mechanism and a supporting bearing, wherein the output shaft is used for being matched with a working head, the motion conversion mechanism comprises an intermediate shaft, a gear mechanism and a motion conversion piece sleeved on the intermediate shaft, the intermediate shaft can be selectively moved to a first position, a second position and a third position along the axis direction of the intermediate shaft, the impact mechanism comprises an impact piece which is used for receiving power of the motion conversion piece and reciprocates along the output axis, the supporting mechanism is used for supporting the impact piece to reciprocate, and the supporting bearing is used for supporting the intermediate shaft, when the intermediate shaft is in the third position, the working head only outputs rotation, and the supporting bearing is in supporting abutting joint with the supporting mechanism. Therefore, the supporting mechanism and the supporting bearing are matched, so that the supporting bearing and the supporting mechanism can be guaranteed to be supported together, the supporting bearing can be prevented from losing efficacy, the service life of the supporting bearing can be prolonged, and the service life of the electric hammer can be prolonged.

Inventors

  • QIU GUOFU
  • GU JINFA

Assignees

  • 苏州宝时得电动工具有限公司

Dates

Publication Date
20260508
Application Date
20201209
Priority Date
20191209

Claims (15)

  1. 1. An electric hammer comprising: A motor that rotates around a motor shaft; an output shaft for mating with a working head, the working head selectively outputting rotation about and/or reciprocating motion along an output axis; A motion conversion mechanism for receiving power of the motor, the motion conversion mechanism including an intermediate shaft, a gear mechanism transmitting power between the intermediate shaft and the output shaft, and a motion conversion member connected to the intermediate shaft, the output shaft being capable of being driven to rotate by the gear mechanism, the intermediate shaft being selectively movable in an intermediate shaft axis direction to a first position, a second position, and a third position; the impact mechanism comprises an impact piece which is used for receiving the power of the motion conversion piece and reciprocates along the output axis, and the impact piece is used for driving the working head to reciprocate along the output axis, wherein when the intermediate shaft moves to the first position, the working head only outputs reciprocating motion, when the intermediate shaft moves to the second position, the working head outputs reciprocating motion and rotation, and when the intermediate shaft moves to the third position, the working head only outputs rotation; The electric hammer is characterized by further comprising a supporting mechanism for supporting the impact piece to reciprocate and a supporting bearing for supporting the intermediate shaft, wherein the supporting bearing is in supporting and abutting connection with the supporting mechanism when the intermediate shaft is at a third position, and the supporting bearing is not separated from the supporting mechanism all the time in the process of moving the intermediate shaft along the axial direction.
  2. 2. The electric hammer of claim 1, wherein the support bearing is connected to the intermediate shaft without relative movement.
  3. 3. The electric hammer of claim 2, further comprising a position drive mechanism including a drive portion fixedly coupled to the support bearing, the drive portion being operable to drive the support bearing and the intermediate shaft to move in the direction of the intermediate shaft axis.
  4. 4. The electric hammer of claim 1, wherein the first, second, and third positions are disposed in sequence along the intermediate shaft axis, and wherein the support bearing is in supporting abutment with the support mechanism when the intermediate shaft is in both the first and second positions.
  5. 5. The electric hammer of claim 1, wherein the support mechanism includes a support member and a bracket, the support member being disposed between the impact member and the bracket, the support member being connected to the bracket without relative movement.
  6. 6. The electric hammer of claim 5, wherein the bracket is an aluminum bracket.
  7. 7. The electric hammer of claim 1, further comprising a first end bearing for supporting the intermediate shaft, the first end bearing being externally sleeved to the intermediate shaft, and the first end bearing being disposed at an end of the intermediate shaft proximate the working head.
  8. 8. The electric hammer of claim 7, wherein the support bearing is located between the first end bearing and an end of the intermediate shaft remote from the working head.
  9. 9. The electric hammer of claim 1, further comprising a second end bearing for supporting the intermediate shaft, the second end bearing being externally sleeved on the intermediate shaft, and the second end bearing being disposed at an end of the intermediate shaft remote from the working head.
  10. 10. The electric hammer of claim 7, further comprising a locking portion sleeved on the intermediate shaft, wherein the intermediate shaft has a fourth position along an axis of the intermediate shaft, and wherein the locking portion is coupleable with the intermediate shaft to lock the intermediate shaft in the fourth position.
  11. 11. The electric hammer of claim 10, wherein the locking portion has a stop portion for stopping the first end bearing, the stop portion being in supporting abutment with the first end bearing.
  12. 12. The electric hammer of claim 10, wherein the support bearing is in supporting abutment with a support mechanism when the intermediate shaft is in the fourth position.
  13. 13. The electric hammer of claim 1, wherein the intermediate shaft axis is disposed parallel to the output axis.
  14. 14. The electric hammer of claim 1, wherein the output axis is disposed parallel to an axis of a motor shaft.
  15. 15. The electric hammer according to claim 1, wherein the motion conversion member is provided as a swing rod bearing fitted to the intermediate shaft, the impact member is provided as a cylinder, and the impact mechanism further includes a striker fitted to the impact member and a striker fitted to the striker, the striker being adapted to be coupled to the working head.

Description

Electric hammer Technical Field The invention relates to the field of electric hammers, in particular to an electric hammer. Background The electric hammer has a transmission for switching between drilling, percussion drilling and chiseling modes of operation. When the electric hammer is in a drilling gear, the supporting bearing fixed on the intermediate shaft is separated from the supporting mechanism, the supporting mechanism cannot support the intermediate shaft, the supporting bearing on the intermediate shaft is easy to lose efficacy, and the motion conversion piece is easy to lose efficacy, so that the service lives of the supporting bearing and the motion conversion piece are influenced, and the service life of the electric hammer is further influenced. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide an electric hammer that can extend the service life of the electric hammer. The electric hammer comprises a motor, an output shaft, a motion conversion mechanism, a motion conversion member and an impact mechanism, wherein the motor rotates around a motor shaft, the output shaft is used for being matched with a working head, the working head can selectively output rotation around an output axis and/or output reciprocating motion along the output axis, the motion conversion mechanism is used for receiving power of the motor, the motion conversion mechanism comprises an intermediate shaft, a gear mechanism for transmitting power between the intermediate shaft and the output shaft, the motion conversion member is connected with the intermediate shaft, the output shaft can be driven by the gear mechanism to output rotation, the intermediate shaft can selectively move to a first position, a second position and a third position along the axis direction, the impact mechanism comprises an impact member for receiving power of the motion conversion member and performing reciprocating motion along the output axis, the impact member is used for driving the working head to reciprocate along the output axis, when the intermediate shaft moves to the first position, the working head only outputs reciprocating motion, when the intermediate shaft moves to the second position, the working head outputs reciprocating motion, the intermediate shaft can move to the first position, the second position and the impact member supports the working head to the third position, and the impact mechanism when the intermediate shaft moves to the third position, and the impact member supports the working head. According to the electric hammer, the supporting mechanism is matched with the supporting bearing, so that the supporting bearing and the supporting mechanism can be supported together, and the supporting bearing can be prevented from losing efficacy, so that the service life of the supporting bearing can be prolonged, and the service life of the electric hammer can be prolonged. In some examples of the invention, the support bearing is connected to the intermediate shaft without relative movement. In some examples of the invention, the drive mechanism further comprises a drive portion fixedly connected to the support bearing, the drive portion being operable to drive the support bearing and the intermediate shaft to move in the direction of the intermediate shaft axis. In some examples of the present invention, the first position, the second position, and the third position are sequentially disposed along the intermediate shaft axis, and the support bearing is in supporting abutment with the support mechanism when the intermediate shaft is in the first position and the second position. In some examples of the invention, the support mechanism includes a support member and a bracket, the support member being disposed between the impact member and the bracket, the support member being connected to the bracket without relative movement. In some examples of the invention, the bracket is an aluminum bracket. In some examples of the present invention, the electric hammer further includes a first end bearing for supporting the intermediate shaft, the first end bearing is sleeved on the intermediate shaft, and the first end bearing is disposed at an end of the intermediate shaft near the working head. In some examples of the invention, the support bearing is located between the first end bearing and an end of the intermediate shaft remote from the working head. In some examples of the present invention, the electric hammer further includes a second end bearing for supporting the intermediate shaft, the second end bearing is sleeved on the intermediate shaft, and the second end bearing is disposed at an end of the intermediate shaft away from the working head. In some examples of the invention, the electric hammer further comprises a locking part sleeved on the intermediate shaft, the intermediate shaft