Electric tool

Abstract

The utility model provides an electric tool which comprises a machine shell, a motor assembly, a transmission assembly and an output assembly, the motor assembly, the transmission assembly and the output assembly are arranged in the machine shell, the transmission assembly is connected between the motor assembly and the output assembly, and the motor assembly comprises a motor shaft and a first driving gear installed on the motor shaft. The transmission assembly comprises a transmission shaft and a first transmission gear installed on the transmission shaft, the first driving gear is meshed with the first transmission gear, the electric tool further comprises a first positioning piece and a second positioning piece, the machine shell is provided with a first positioning hole and a second positioning hole, the first positioning piece is installed in the first positioning hole, and the second positioning piece is installed in the second positioning hole. In the extending direction of the transmission shaft, the first positioning piece and the second positioning piece are located on the two sides of the transmission shaft respectively, the transmission shaft comprises a first end and a second end, the first positioning piece is adjacent to the first end, and the second positioning piece is adjacent to the second end. And the transmission shaft is axially supported.

Description

Technical Field

[0001] The present application relates to the field of tools, and in particular to an electric tool. Background Art

[0002] The electric tool includes a housing and a motor assembly, a transmission assembly, and an output assembly arranged in the housing. The transmission assembly includes a transmission shaft and a bearing installed on the transmission shaft. The housing is provided with a mounting groove, and the bearing is installed in the mounting groove. The motor assembly drives the transmission shaft to rotate, and the transmission shaft is prone to axial movement during the rotation process. The housing is made of engineering plastics. During the axial movement of the transmission shaft, the groove wall of the mounting groove is prone to thermal deformation. After the groove wall of the mounting groove is thermally deformed, the ability of the groove wall of the mounting groove to withstand axial impact is reduced and it is easy to be damaged.

[0003] It is necessary to provide a new electric tool. Utility Model Content

[0004] The present application provides an electric tool with a simple structure, stability and low cost.

[0005] Specifically, the present application provides an electric tool, which includes a housing and a motor assembly, a transmission assembly, and an output assembly arranged in the housing, the transmission assembly is connected between the motor assembly and the output assembly, the motor assembly includes a motor shaft and a first driving gear installed on the motor shaft, the transmission assembly includes a transmission shaft and a first transmission gear installed on the transmission shaft, the first driving gear is meshed with the first transmission gear, the electric tool also includes a first positioning member and a second positioning member, the housing is provided with a first positioning hole and a second positioning hole, the first positioning member is installed in the first positioning hole, and the second positioning member is installed in the second positioning hole, in the extension direction of the transmission shaft, the first positioning member and the second positioning member are respectively located on both sides of the transmission shaft, the transmission shaft includes a first end and a second end, the first positioning member is adjacent to the first end, and the second positioning member is adjacent to the second end, and the first positioning member and the second positioning member are configured to axially support the transmission shaft when the transmission shaft moves axially.

[0006] Furthermore, the transmission assembly also includes a first bearing installed on the transmission shaft, the housing is provided with a first mounting groove, and the first bearing is installed in the first mounting groove.

[0007] Furthermore, in the extension direction of the transmission shaft, the first installation groove has a first groove wall and a second groove wall that are arranged opposite to each other, and the transmission shaft passes through the first groove wall and the second groove wall.

[0008] Furthermore, the transmission assembly also includes a second bearing installed on the transmission shaft, the housing is provided with a second mounting groove, and the second bearing is installed in the second mounting groove.

[0009] Furthermore, in the extension direction of the transmission shaft, the second installation groove has a third groove wall and a fourth groove wall that are arranged opposite to each other, the third groove wall is closer to the first installation groove than the fourth groove wall, and the transmission shaft passes through the third groove wall.

[0010] Furthermore, a first gap is defined between the first end and the first positioning member, and a second gap is defined between the second end and the second positioning member.

[0011] Further, in the extension direction of the transmission shaft, the size D1 of the first gap satisfies: 0.1 mm≤D1≤0.3 mm, and the size D2 of the second gap satisfies: 0.1 mm≤D2≤0.3 mm.

[0012] Furthermore, the transmission shaft includes a second transmission gear, which is arranged adjacent to the first positioning member, and the output assembly includes an output shaft and a second drive gear installed on the output shaft, and the second transmission gear is meshed with the second drive gear.

[0013] Furthermore, the transmission assembly also includes a third bearing installed on the transmission shaft, and the electric tool also includes a piston impact assembly arranged in the housing, the piston impact assembly is connected to the output shaft, and the third bearing is connected to the piston impact assembly.

[0014] Furthermore, in the extending direction of the transmission shaft, the third bearing is located between the first transmission gear and the second transmission gear.

[0015] In the present application, the first bearing and the second bearing are respectively installed on the transmission shaft, the housing is provided with a first mounting groove and a second mounting groove, the first bearing is installed in the first mounting groove, and the second bearing is installed in the second mounting groove. In the extension direction of the transmission shaft, the first positioning member and the second positioning member are respectively located on both sides of the transmission shaft, the transmission shaft includes a first end and a second end, the first positioning member is arranged adjacent to the first end, and the second positioning member is arranged adjacent to the second end, and the first positioning member and the second positioning member are configured to: when the transmission shaft moves axially, the transmission shaft is axially supported; this design prevents the transmission shaft from axially moving, and solves the problem of easy damage to the groove wall of the mounting groove with extremely low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the electric tool of the present application.

[0017] Figure 2 yes Figure 1 A structural schematic diagram of a partial structure of the electric tool shown.

[0018] Figure 3 yes Figure 2 A schematic structural diagram of the first half shell of the electric tool is shown.

[0019] Figure 4 yes Figure 1 The power tool is shown in a cross-sectional view along AA.

[0020] Figure 5 yes Figure 3 The first half shell is shown in a cross-sectional view along line BB.

[0021] Figure 6 yes Figure 1 A schematic structural diagram of the electric tool from another perspective is shown.

[0022] Figure 7 yes Figure 6 The power tool is shown in a cross-sectional view along CC. DETAILED DESCRIPTION

[0023] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application.

[0024] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this utility model belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate quantity restrictions, but indicate that there is at least one. "Multiple" or "several" means two and more than two. Unless otherwise specified, similar words such as "front", "rear", "lower" and / or "upper" are only for convenience of explanation and are not limited to one position or one spatial orientation. Similar words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0025] Please combine Figures 1 to 7 The present application provides an electric tool 100, which includes a housing 10 and a motor assembly 20, a transmission assembly 30, and an output assembly 40 disposed in the housing 10. The transmission assembly 30 is connected between the motor assembly 20 and the output assembly 40, and the motor assembly 20 transmits the rotational power to the output assembly 40 through the transmission assembly 30. The motor assembly 20 includes a motor 21 and a first driving gear 22, the motor 21 includes a motor shaft 210, the first driving gear 22 is mounted on the motor shaft 210, the transmission assembly 30 includes a transmission shaft 31 and a first transmission gear 32 mounted on the transmission shaft 31, and the first driving gear 22 is meshed with the first transmission gear 32. The transmission shaft 31 includes a second transmission gear 33, specifically, the transmission shaft 31 includes a shaft portion 37 and a second transmission gear 33, the shaft portion 37 and the second transmission gear 33 are integrally arranged, and the first transmission gear 32 is mounted on the shaft portion 37. The output assembly 40 includes an output shaft 41 and a second driving gear 42 mounted on the output shaft 41, and the second transmission gear 33 is meshed with the second driving gear 42.

[0026] The transmission assembly 30 further includes a first bearing 34 mounted on the transmission shaft 31. The housing 10 is provided with a first mounting groove 11, and the first bearing 34 is mounted in the first mounting groove 11. In the extension direction of the transmission shaft 31, the first mounting groove 11 has a first groove wall 111 and a second groove wall 112 arranged oppositely, and the transmission shaft 31 passes through the first groove wall 111 and the second groove wall 112. The transmission assembly 30 further includes a second bearing 35 mounted on the transmission shaft 31. The housing 10 is provided with a second mounting groove 12, and the second bearing 35 is mounted in the second mounting groove 12. In the extension direction of the transmission shaft 31, the second mounting groove 12 has a third groove wall 121 and a fourth groove wall 122 arranged oppositely, and the third groove wall 121 is closer to the first mounting groove 11 than the fourth groove wall 122, and the transmission shaft 31 passes through the third groove wall 121. The transmission assembly 30 further includes a third bearing 36 mounted on the transmission shaft 31. The power tool 100 further includes a piston impact assembly 50 disposed in the housing 10. The piston impact assembly 50 is connected to the output shaft 41. The third bearing 36 is connected to the piston impact assembly 50. In the extension direction of the transmission shaft 31, the third bearing 36 is located between the first bearing 34 and the second bearing 35. Specifically, the first bearing 34, the second bearing 35 and the third bearing 36 are all installed on the shaft portion 37. In the extension direction of the transmission shaft 31, the first bearing 34 is located between the second transmission gear 33 and the third bearing 36, and the first transmission gear 32 is located between the third bearing 36 and the second bearing 35. In the present application, the third bearing 36 is a rod end rocker bearing.

[0027] The motor 21 transmits the rotational power to the first transmission gear 32 through the first driving gear 22, the first transmission gear 32 transmits the rotational power to the transmission shaft 31, the transmission shaft 31 transmits the rotational power to the second driving gear 42 through the second transmission gear 33, the second driving gear 42 transmits the rotational power to the output shaft 41, and the output shaft 41 outputs the rotational power. The transmission shaft 31 transmits the rotational power to the rod end rocker bearing 36, the rod end rocker bearing 36 and the piston impact assembly 50 jointly convert the rotational motion into a linear reciprocating motion, the rod end rocker bearing 36 transmits the axial reaction force to the transmission shaft 31, the transmission shaft 31 transmits the axial reaction force to the first bearing 34 and the second bearing 35, the first bearing 34 transmits the axial reaction force to the first groove wall 111 and the second groove wall 112 of the first installation groove 11 in the axial direction, and the second bearing 35 transmits the axial reaction force to the third groove wall 121 and the fourth groove wall 122 of the second installation groove 12 in the axial direction.

[0028] The electric tool 100 further includes a first positioning member 60 and a second positioning member 70. The housing 10 is provided with a first positioning hole 101 and a second positioning hole 102. The first positioning member 60 is installed in the first positioning hole 101, and the second positioning member 70 is installed in the second positioning hole 102. The first positioning member 60 is arranged adjacent to the second transmission gear 33, and the second positioning member 70 is arranged adjacent to the second bearing 35. The housing 10 includes a first half shell 13 and a second half shell 14 arranged opposite to each other. The first positioning hole 101 can be arranged in the first half shell 13 or the second half shell 14, and the second positioning hole 102 can be arranged in the first half shell 13 or the second half shell 14; in the present application, the first positioning hole 101 is arranged in the first half shell 13, and the second positioning hole 102 is arranged in the first half shell 13. In the extension direction of the transmission shaft 31, the first positioning member 60 and the second positioning member 70 are respectively located on both sides of the transmission shaft 31. The transmission shaft 31 includes a first end and a second end. The first positioning member 60 is arranged adjacent to the first end, and the second positioning member 70 is arranged adjacent to the second end. The first positioning member 60 and the second positioning member 70 are configured to axially support the transmission shaft 31 when the transmission shaft 31 moves axially. There is a first gap between the first end and the first positioning member 60, and there is a second gap between the second end and the second positioning member 70. In the extension direction of the transmission shaft 31, the size D1 of the first gap satisfies: 0.1mm≤D1≤0.3mm, and the size D2 of the second gap satisfies: 0.1mm≤D2≤0.3mm. In the present application, the first positioning member 60 and the second positioning member 70 are both pins with extremely high hardness. This design prevents the transmission shaft 31 from axial movement, and solves the problem of easy damage to the groove wall of the mounting groove with extremely low cost.

[0029] In the present application, the first bearing 34 and the second bearing 35 are respectively installed on the transmission shaft 31, the housing 10 is provided with a first mounting groove 11 and a second mounting groove 12, the first bearing 34 is installed in the first mounting groove 11, the second bearing 35 is installed in the second mounting groove 12, in the extension direction of the transmission shaft 31, the first positioning member 60 and the second positioning member 70 are respectively located on both sides of the transmission shaft 31, the transmission shaft 31 includes a first end and a second end, the first positioning member 60 is arranged adjacent to the first end, and the second positioning member 70 is arranged adjacent to the second end, and the first positioning member 60 and the second positioning member 70 are configured to: when the transmission shaft 31 moves axially, the transmission shaft 31 is axially supported. This design prevents the transmission shaft 31 from axial movement, and solves the problem of easy damage to the groove wall of the mounting groove at a very low cost.

[0030] The above is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application has been disclosed as a preferred embodiment as above, it is not intended to limit the present application. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of the technical solution of the present application.

Claims

1. An electric tool, comprising a housing and a motor assembly, a transmission assembly, and an output assembly disposed in the housing, wherein the transmission assembly is connected between the motor assembly and the output assembly, the motor assembly comprises a motor shaft and a first driving gear mounted on the motor shaft, the transmission assembly comprises a transmission shaft and a first transmission gear mounted on the transmission shaft, the first driving gear meshes with the first transmission gear, and is characterized in that: The electric tool also includes a first positioning member and a second positioning member, the housing is provided with a first positioning hole and a second positioning hole, the first positioning member is installed in the first positioning hole, and the second positioning member is installed in the second positioning hole, in the extension direction of the transmission shaft, the first positioning member and the second positioning member are respectively located on both sides of the transmission shaft, the transmission shaft includes a first end and a second end, the first positioning member is arranged adjacent to the first end, and the second positioning member is arranged adjacent to the second end, and the first positioning member and the second positioning member are configured to: when the transmission shaft moves axially, provide axial support to the transmission shaft.

2. The electric tool according to claim 1, characterized in that: The transmission assembly further includes a first bearing installed on the transmission shaft, the housing is provided with a first mounting groove, and the first bearing is installed in the first mounting groove.

3. The electric tool according to claim 2, characterized in that: In the extending direction of the transmission shaft, the first installation groove has a first groove wall and a second groove wall that are arranged opposite to each other, and the transmission shaft passes through the first groove wall and the second groove wall.

4. The electric tool according to claim 2, characterized in that: The transmission assembly further includes a second bearing mounted on the transmission shaft, the housing is provided with a second mounting groove, and the second bearing is mounted in the second mounting groove.

5. The electric tool according to claim 4, characterized in that: In the extending direction of the transmission shaft, the second installation slot has a third slot wall and a fourth slot wall that are arranged opposite to each other, the third slot wall is closer to the first installation slot than the fourth slot wall, and the transmission shaft passes through the third slot wall.

6. The electric tool according to claim 1, characterized in that: A first gap is formed between the first end and the first positioning member, and a second gap is formed between the second end and the second positioning member.

7. The electric tool according to claim 6, characterized in that: In the extending direction of the transmission shaft, a size D1 of the first gap satisfies: 0.1 mm≤D1≤0.3 mm, and a size D2 of the second gap satisfies: 0.1 mm≤D2≤0.3 mm.

8. The electric tool according to claim 1, characterized in that: The transmission shaft includes a second transmission gear, which is disposed adjacent to the first positioning member. The output assembly includes an output shaft and a second drive gear mounted on the output shaft, and the second transmission gear is meshed with the second drive gear.

9. The electric tool according to claim 8, characterized in that: The transmission assembly also includes a third bearing installed on the transmission shaft. The electric tool also includes a piston impact assembly arranged in the housing. The piston impact assembly is connected to the output shaft, and the third bearing is connected to the piston impact assembly.

10. The electric tool according to claim 9, characterized in that: In the extending direction of the transmission shaft, the third bearing is located between the first transmission gear and the second transmission gear.

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