Electric hammer

Patent metadata

Field	Value
Publication number	US-12103155-B2
Application number	US-202318177535-A
Country	US
Kind code	B2
Filing date	Mar 2, 2023
Priority date	Sep 25, 2020
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

An electric hammer includes a housing, an electric motor, an output assembly, an impact assembly, a mounting shaft, a clutch assembly, and a switching assembly. The mounting shaft is rotatable about a second axis. When the electric hammer is in the drill mode, a sleeve of the output assembly rotates. When the electric hammer is in the hammer drill mode, the sleeve rotates and an impact block of the impact assembly reciprocates in the sleeve. The switching assembly is configured to switch the clutch assembly between a first state and a second state and includes a switching element. The switching element includes a forced end and a drive end, the output assembly moving along a first axis drives the forced end to move, and the drive end is configured to drive the clutch assembly to be switched to the first state.

First claim

What is claimed is:

1. An electric hammer, comprising:
a main body;
a housing as a sub-assembly of the main body;
an electric motor at least partially disposed in the housing;
an output assembly comprising a sleeve rotatable about a first axis;
an impact assembly comprising a swash bearing and an impact block capable of being driven by the swash bearing to reciprocate in the sleeve, wherein the impact block is capable of outputting an impact force forward when moving in the sleeve; and
a mounting shaft for mounting the swash bearing, wherein the mounting shaft is capable of being driven by the electric motor to rotate about a second axis;
wherein the electric hammer has a drill mode and a hammer drill mode, when the electric hammer is in the drill mode, the sleeve rotates, and, when the electric hammer is in the hammer drill mode, the sleeve rotates and the impact block reciprocates in the sleeve;
wherein the electric hammer further comprises a clutch assembly having a first state in which the swash bearing is capable of being driven to move with the mounting shaft and a second state in which the mounting shaft is allowed to rotate relative to the swash bearing,
wherein the sleeve has a length L1 along a direction of the first axis,
wherein the main body has a length L2 along the direction of the first axis,
wherein the housing has a length L3 in a direction perpendicular to the first axis, and
wherein a ratio of the length L2 to the length L1 is greater than or equal to 2.5 and less than or equal to 4, and the length L3 is greater than or equal to 55 mm and less than 70 mm.

2. The electric hammer according to claim 1 , wherein the sleeve is substantially symmetrical about a vertical plane.

3. The electric hammer according to claim 1 , further comprising a first transmission member configured to receive power outputted from the electric motor to drive the mounting shaft to rotate;
wherein the clutch assembly comprises:
an input portion rotating synchronously with the first transmission member or the mounting shaft; and
an output portion for mating with the input portion to drive the swash bearing to move;

wherein the swash bearing is slidable on the mounting shaft along the second axis, the output portion is slidable with the swash bearing along the second axis, and the swash bearing and is capable of driving a whole formed by the swash bearing and the output portion to slide along the second axis.

4. The electric hammer according to claim 3 , wherein the swash bearing comprises a bearing core mounted to the mounting shaft and the bearing core extends toward the first transmission member to form the output portion.

5. The electric hammer according to claim 1 , wherein the output assembly further comprises:
a first transmission portion fixedly connected to the sleeve; and
a second transmission portion rotating synchronously with the mounting shaft and driving the first transmission portion to rotate.

6. The electric hammer according to claim 1 , further comprising a support bracket fixedly connected to or integrally formed with the housing, wherein the support bracket is configured to support the mounting shaft.

7. The electric hammer according to claim 1 , wherein the output assembly further comprises:
a first transmission portion fixedly connected to the sleeve; and
a second transmission portion rotating synchronously with the mounting shaft and driving the first transmission portion to rotate;
wherein an orthographic projection of the first transmission portion on a plane perpendicular to the first axis has a highest point and a lowest point.

8. The electric hammer according to claim 1 , further comprising:
a transmission assembly comprising a first transmission member capable of being driven by the electric motor to rotate about the second axis, wherein the first transmission member is fixedly connected to the mounting shaft;
wherein the swash bearing comprises a bearing core mounted on the mounting shaft, wherein when the electric hammer is in the hammer drill mode, the sleeve rotates and the bearing core rotates synchronously with the mounting shaft;
the swash bearing is slidable on the mounting shaft along the second axis to a first position and a second position, wherein when the swash bearing is at the first position, the bearing core rotates synchronously with the mounting shaft, and when the swash bearing is at the second position, the mounting shaft is rotatable relative to the bearing core; and
the electric hammer further comprises a locking element, wherein when the swash bearing is at the second position, the locking element is configured to restrain the bearing core from rotating, and when the swash bearing is at the first position, the locking element allows the bearing core to rotate.

9. The electric hammer according to claim 8 , wherein the bearing core is connected to an engagement portion which mates with the locking element.

10. The electric hammer according to claim 9 , wherein the transmission assembly comprises an input portion configured to output power to the swash bearing, and the bearing core is connected to an output portion which mates with the input portion when the swash bearing is at the first position.

11. The electric hammer according to claim 10 , wherein the output portion and the engagement portion are disposed at two ends of the bearing core separately.

12. The electric hammer according to claim 1 , further comprising:
a transmission assembly comprising a first transmission member capable of being driven by the electric motor to rotate about the second axis, wherein the first transmission member is fixedly connected to the mounting shaft;
wherein the swash bearing comprises a bearing core mounted on the mounting shaft, wherein when the electric hammer is in the hammer drill mode, the sleeve rotates and the bearing core rotates synchronously with the mounting shaft;
wherein the swash bearing is slidable on the mounting shaft along the second axis to a first position and a second position;
wherein, when the swash bearing is at the first position, the bearing core rotates synchronously with the mounting shaft, and, when the swash bearing is at the second position, the mounting shaft is rotatable relative to the bearing core; and
wherein the electric hammer further comprises a locking element, wherein when the swash bearing is at the first position, the locking element is separated from the bearing core to allow the bearing core to rotate, and when the swash bearing is at the second position, the locking element meshes with the bearing core to restrain the bearing core from rotating.

13. The electric hammer according to claim 1 , wherein the output assembly further comprises a first transmission portion mating with the mounting shaft and configured to transmit power of the electric motor to the sleeve, the first transmission portion comprises a rotating member fixedly connected to the sleeve and an intermediate member mating with the rotating member, and an accommodation space configured to accommodate the intermediate member is formed on the rotating member.

14. The electric hammer according to claim 13 , wherein a diameter of the accommodation space is smaller than a root diameter of the rotating member.

15. The electric hammer according to claim 1 , wherein a transmission assembly further comprises an input portion configured to output power to the swash bearing, and the swash bearing is connected to an output portion which mates with the input portion;
wherein, when the electric hammer is in the drill mode, the output portion is separated fr

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Han Yan
• Yao Jiuling
• Cai Jianheng
• Sun Hongbo

Classifications

• B25D2250/331

  Use of bearings · CPC title

• B25D2250/121

  Housing details · CPC title

• B25D2250/095

  Electric motors · CPC title

• B25D2216/0084

  Mode-changing mechanisms · CPC title

• B25D16/003

  Clutches specially adapted therefor · CPC title