Search

CN-117444906-B - Electric hammer

CN117444906BCN 117444906 BCN117444906 BCN 117444906BCN-117444906-B

Abstract

The invention provides an electric hammer, the whole weight of which is between 0.9Kg and 1.6Kg, the electric hammer comprises a motor, an intermediate shaft, a swing rod bearing and a cylinder assembly, the motor is in transmission connection with the intermediate shaft, the cylinder assembly comprises a cylinder, a ram accommodated in the cylinder and a ram matched with the ram, the swing rod bearing is sleeved on the intermediate shaft, a swing rod of the swing rod bearing is connected with the cylinder, and the ratio of the distance from the central line of the cylinder to the central line of the intermediate shaft to the inner diameter of the cylinder is 1.20-1.44. The electric hammer provided by the invention has small volume under the condition of ensuring the working efficiency to be basically unchanged.

Inventors

  • LI ANGZI

Assignees

  • 苏州宝时得电动工具有限公司

Dates

Publication Date
20260508
Application Date
20170930

Claims (10)

  1. 1. The electric hammer comprises a motor, a middle shaft, a swing rod bearing and a cylinder assembly, wherein the weight of the electric hammer is between 0.9Kg and 1.6Kg, and the weight of the electric hammer is the weight of the electric hammer except for a battery pack, an auxiliary handle and a working head; the motor is in transmission connection with the intermediate shaft; The cylinder assembly comprises a cylinder, a ram accommodated in the cylinder and a ram matched with the ram; The swing rod bearing is sleeved on the intermediate shaft, and a swing rod of the swing rod bearing is connected with the air cylinder; Characterized in that the ratio of the distance from the center line of the cylinder to the center line of the intermediate shaft to the inner diameter of the cylinder is 1.20 to 1.44.
  2. 2. The electric hammer of claim 1, wherein the distance from the centerline of the cylinder to the centerline of the intermediate shaft is 23.5mm to 25.5mm.
  3. 3. The electric hammer of claim 1, further comprising an input gear sleeved on the intermediate shaft and in driving connection with the motor, and a chuck assembly mounted in front of the ram, wherein a ratio of a distance of the input gear to the chuck assembly to an inner diameter of the cylinder is 6.32 to 7.11.
  4. 4. The electric hammer of claim 3 wherein the input gear is 120mm to 135mm from the collet assembly.
  5. 5. The electric hammer of claim 4, wherein the ratio of the length of the striker rod to the inner diameter of the cylinder is 0.667 to 0.865, and/or the length of the striker rod is 13mm to 16mm.
  6. 6. The electric hammer of claim 1, wherein the motor has an outer diameter of no greater than 46mm.
  7. 7. The electric hammer of any one of claims 1-6, wherein the cylinder has an inside diameter of 18.5mm to 19.5mm.
  8. 8. The electric hammer of claim 7, wherein the weight of the ram is 36 grams to 46 grams.
  9. 9. The electric hammer of any one of claims 1-6 wherein the ram strikes the ram at a frequency of 5400 to 6000 times/min.
  10. 10. The electric hammer according to any one of claims 1-6, characterized in that the electric hammer has a total weight of 1.4Kg.

Description

Electric hammer Technical Field The invention relates to an electric hammer, and belongs to the technical field of electric tools. Background Various power tools are often used in engineering construction, such as drilling holes in concrete, floor slabs, brick walls, and stone using electric hammers. The existing electric hammer with the weight of the whole machine between 0.9Kg and 1.6Kg mainly comprises a motor, a transmission mechanism, an impact mechanism, a chuck and other components, wherein the weight of the whole machine refers to the weight of the electric hammer after a battery pack, an auxiliary handle and a working head are removed. The transmission mechanism comprises an intermediate shaft in transmission connection with the motor, a swing rod bearing and an intermediate gear, wherein the swing rod bearing and the intermediate gear are sleeved on the intermediate shaft, and the swing rod bearing and the intermediate gear can rotate together with the intermediate shaft. The impact mechanism comprises an air cylinder connected with a swing rod sleeved on a swing rod bearing, a ram accommodated in the air cylinder and a ram matched with the ram. The chuck is fixed at the front end of the impact mechanism to clamp different types of working heads, so that the purpose of drilling under different working conditions is achieved. However, the existing electric hammer has a large volume, and is uncomfortable for an operator to hold, so that the electric hammer is inconvenient to operate. Disclosure of Invention The present invention provides an electric hammer to solve the above-mentioned or other potential technical problems existing in the prior art. According to some embodiments of the invention, an electric hammer with a total weight of 0.9Kg to 1.6Kg is provided, and the electric hammer comprises a motor, an intermediate shaft, a swing rod bearing and a cylinder assembly, wherein the motor is in transmission connection with the intermediate shaft, the cylinder assembly comprises a cylinder, a hammer accommodated in the cylinder and a ram matched with the hammer, the swing rod bearing is sleeved on the intermediate shaft, a swing rod of the swing rod bearing is connected with the hammer, and the ratio of the distance from the center line of the cylinder to the center line of the intermediate shaft to the inner diameter of the cylinder is 1.20 to 1.75. The electric hammer as described above, wherein the distance from the center line of the cylinder to the center line of the intermediate shaft is 23.5mm to 25.5mm. The electric hammer as described above, wherein the distance from the center line of the cylinder to the center line of the intermediate shaft is 24.5mm. The electric hammer further comprises an input gear and a chuck assembly, wherein the input gear is sleeved on the intermediate shaft and is in transmission connection with the motor, the chuck assembly is arranged in front of the plunger rod, and the ratio of the distance from the input gear to the chuck assembly to the inner diameter of the air cylinder is 6.32-7.11. The electric hammer as described above, wherein the input gear is 120mm to 135mm from the collet assembly. The electric hammer comprises a first part and a second part, wherein the end face of the first part is matched with the hammer, the end face of the second part is matched with the working head, and the cross section area of the second part is larger than that of the first part. The electric hammer as described above, wherein a ratio of a length of the striker rod to an inner diameter of the cylinder is 0.667 to 0.865. The electric hammer as described above, wherein the length of the striking rod is 13mm to 16mm. The electric hammer as described above, wherein the outer diameter of the motor is not more than 46mm. The electric hammer as described above, wherein the stack length of the motor is not more than 15mm, wherein the stack length of the motor refers to the overlap length of the rotor and the stator in the motor. The electric hammer as described above, wherein the cylinder has an inner diameter of 18.5mm to 19.5mm. The electric hammer as described above, wherein the cylinder has an inner diameter of 19mm. The electric hammer as described above, wherein the weight of the hammer is 36 g to 46 g. The electric hammer as described above, wherein the weight of the hammer is 42 g. The electric hammer as described above, wherein the frequency at which the hammer strikes the striker is 5400 to 6000 times/min. The electric hammer, wherein the whole machine weight of the electric hammer is 1.4Kg. According to the technical scheme of the embodiment of the invention, when the ratio of the distance from the center line of the air cylinder to the center line of the intermediate shaft to the inner diameter of the air cylinder is 1.20-1.75, the electric hammer is small in size, the working efficiency is basically unchanged, an operator can grasp the electric hammer more convenient