A handheld electric tool

Abstract

The present invention relates to the technical field of handheld electric tools, and in particular to a handheld electric tool, comprising a rotor module and an output shaft module, wherein the rotor module and the output shaft module are connected via a housing, and within the cavity of the housing, the rotor module can drive the output shaft module to rotate clockwise or counterclockwise. The device and method are not only simple in structure and good in sealing effect, but also can realize rapid assembly and disassembly, and are easy to maintain, and can effectively reduce the production cost of the equipment and improve production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of handheld electric tools, and in particular to a handheld electric tool. Background Art

[0002] At present, handheld power tools such as pistol drills and angle grinders on the market are mainly composed of electrical parts and transmission parts. Their working principle is to use DC or AC to drive the spindle to rotate, driving the tool clamped at the front end to work. There are thousands of domestic power tool manufacturers, and the product quality is uneven. In addition to electrical problems such as leakage, insulation, and circuit heating, there are also mechanical failures such as loose connectors, vibration, and wear. After a failure, disassembly and assembly are cumbersome, and the maintenance cost is high. Therefore, many users directly give up maintenance and buy new products instead. Therefore, a handheld power tool that is cheap, reliable, and has a certain service life is urgently needed to fill the market.

[0003] However, given the internal structure of current electric tools, the mechanical part is mainly composed of a large number of parts such as spindles, bearings, large and small gears, retaining rings, and sealing rings. The number and type of parts determine the increase in the time consumed during assembly. Therefore, both the cost of the parts themselves and the labor cost during assembly production are the main factors determining the price of the product. In order to reduce the production cost of the product, most companies are trying to reduce the cost of the product by changing the material of the parts. However, the reduction in the quality of the parts will directly affect the performance of the product. For this reason, companies have tried to improve the difficulty of employment, reduce labor costs, and improve productivity by replacing people with machines. However, given the large number of parts, specifications, and materials in handheld power tools, such as rubber sealing rings, retaining rings and other parts, it is very difficult to implement automation, which directly leads to an increase in the complexity of automation and a straight increase in manufacturing costs. The above problems have become the "neck" problems in the development of power tools.

[0004] Therefore, a technology is urgently needed to solve this problem. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of the prior art and provide a handheld electric tool, wherein the rotor module and the output shaft module are clamped and connected to the shell through the shell, and the output shaft module is driven by the rotor module as a driving mechanism, so as to achieve the purpose of clockwise or counterclockwise rotation of the workpiece installed on the end of the output shaft. The device and method are not only simple in structure and good in sealing effect, but also can realize rapid assembly and disassembly, and are easy to maintain, which can effectively reduce the production cost of the equipment and improve production efficiency.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A handheld electric tool comprises a rotor module and an output shaft module, wherein the rotor module and the output shaft module are connected via a shell. In the cavity of the shell, the rotor module can drive the output shaft module to rotate clockwise or counterclockwise.

[0008] Furthermore, the rotor module includes a rotor shaft arranged at an axial position, and a cylindrical first step, a second step, a third step and a fourth step connected in sequence are arranged in sequence along the opposite direction of the end of the rotor shaft; the fourth step sleeve is provided with a fan, the third step sleeve is provided with a first bearing, the second step sleeve is provided with a first meshing gear, the first step can extend out of the first meshing gear, and the end of the first step limits the first meshing gear by riveting; a bearing sleeve is provided along the outer ring sleeve of the first bearing, and the bearing sleeve is used to be embedded in the housing.

[0009] Furthermore, the centers of the first step, the second step, the third step and the fourth step are located on the same central axis, and the outer diameter of the first step is smaller than the outer diameter of the second step, the outer diameter of the second step is smaller than the outer diameter of the third step, and the outer diameter of the third step is smaller than the outer diameter of the fourth step.

[0010] Furthermore, the height of the fan is smaller than the height of the fourth step, the height of the first bearing is larger than the height of the third step, and the height of the first meshing gear is larger than the height of the second step.

[0011] Further, the output shaft module includes an output shaft, and a cylindrical fifth step, a sixth step, a seventh step and a workpiece connecting portion are sequentially arranged in the opposite direction of the end of the output shaft; a second bearing and a second meshing gear are sleeved on the sixth step, the bottom of the second bearing is in contact with the top of the seventh step, and the top of the second bearing is in contact with the bottom of the second meshing gear; a third bearing is sleeved on the fifth step; the second bearing, the third bearing and the second meshing gear are encapsulated in the housing.

[0012] Further, the centers of the fifth step, the sixth step, the seventh step and the workpiece connection portion are located on the same central axis, and the outer diameter of the fifth step is smaller than the outer diameter of the sixth step, the outer diameter of the sixth step is smaller than the outer diameter of the seventh step, and the outer diameter of the seventh step is larger than the outer diameter of the workpiece connection portion.

[0013] Furthermore, the shell is cylindrical, with an output shaft port for the output shaft to extend out being provided at one end, and a transmission cavity being formed by a matching end cover seal at the other end; a rotor module connecting sleeve for connecting the rotor module is provided along the side wall of the shell, and the rotor module connecting sleeve is connected to the transmission cavity.

[0014] Furthermore, the end cover includes a conical cap and a limit sleeve which are connected to each other, the conical cap is used to be connected to the housing, and the limit sleeve is located in the transmission cavity; a third bearing ring groove for embedding the third bearing and an output shaft ring groove for limiting the top movement of the output shaft are provided along the inner wall of the limit sleeve; a second bearing ring groove for embedding the second bearing is provided at the transmission cavity position corresponding to the output shaft port; the second meshing gear is located between the limit sleeve and the second bearing; and the seventh step corresponds to the output shaft port.

[0015] Furthermore, an end cover ring groove is opened on the inner wall corresponding to the top of the shell, and the conical cover cap also includes an annular flange that can match the end cover ring groove, the height of the end cover ring groove is greater than the height of the annular flange, and the annular flange is connected to the end cover ring groove by riveting.

[0016] Furthermore, a dust cover installation groove for installing a dust cover is provided along the outer wall of the output shaft port; and an annular dust cover groove is also provided along the end of the output shaft port.

[0017] Beneficial Effects

[0018] The handheld electric tool provided by the present invention clamps the rotor module and the output shaft module through the housing and transmits them in the housing, and transmits the output shaft module through the rotor module as a driving mechanism, so as to achieve the purpose of clockwise or counterclockwise rotation of the workpiece installed on the end of the output shaft. The device and method are not only simple in structure and good in sealing effect, but also can realize rapid assembly and disassembly, and are easy to maintain, which can effectively reduce the production cost of the equipment and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A side view of a handheld electric tool according to the present invention;

[0020] Figure 2 This is a cross-sectional view of the internal connection of a housing of a handheld electric tool according to the present invention;

[0021] Figure 3 This is a schematic diagram of the connection between the first meshing gear and the second meshing gear of a handheld electric tool according to the present invention;

[0022] Figure 4This is a schematic diagram of the rotor shaft structure of a handheld electric tool according to the present invention;

[0023] Figure 5 This is a schematic diagram of the output shaft structure of a handheld electric tool according to the present invention;

[0024] Figure 6 This is a schematic structural diagram of an output shaft module of a handheld electric tool according to the present invention;

[0025] Figure 7 A three-dimensional diagram of a housing of a handheld electric tool according to the present invention;

[0026] Figure 8 An exploded view of a housing of a handheld electric tool according to the present invention;

[0027] Fig. 9 This is a cross-sectional view of a housing of a handheld electric tool according to the present invention.

[0028] Graphic marking:

[0029] 1-rotor module, 11-rotor shaft, 12-first step, 13-second step, 14-third step, 15-fourth step, 16-fan, 17-first bearing, 18-first meshing gear, 19-bearing sleeve, 2-output shaft module, 21-output shaft, 22-fifth step, 23-sixth step, 24-seventh step, 25-workpiece connection part, 26-second bearing, 27-third bearing, 28-second meshing gear, 3-housing, 31-output shaft port, 32-end cover, 33-transmission cavity, 34-rotor module connecting sleeve, 35-first bearing ring groove, 36-second bearing ring groove, 37-third bearing ring groove, 38-output shaft ring groove, 39-end cover ring groove, 310-conical cap, 311-limiting sleeve, 312-annular flange, 313-dustproof groove, 314-dustproof cover mounting groove. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below based on the accompanying drawings and embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1-3 As shown, a handheld electric tool includes a rotor module 1 and an output shaft module 2, wherein the rotor module 1 and the output shaft module 2 are connected via a shell 3, and within the cavity of the shell 3, the rotor module 1 can drive the output shaft module 2 to rotate clockwise or counterclockwise.

[0032] Example 1

[0033] like Figure 3 and 4 As shown, the rotor module 1 includes a rotor shaft 11 arranged at an axial position, and a cylindrical first step 12, a second step 13, a third step 14 and a fourth step 15 are sequentially arranged in the opposite direction of the end of the rotor shaft 11; the outer wall of the fourth step 15 is sleeved with a fan 16, the outer wall of the third step 14 is sleeved with a first bearing 17, the outer wall of the second step 13 is sleeved with a first meshing gear 18, the first step 12 can extend out of the first meshing gear 18, and the end of the first step 12 is riveted by a riveting machine to form a spherical surface for limiting the first meshing gear 18, and the outer diameter of the spherical surface is larger than the inner diameter of the first step 12; a bearing sleeve 19 is sleeved along the outer ring of the first bearing 17, and the bearing sleeve 19 is used to be embedded in the housing 3 to facilitate the first meshing gear 18 to mesh with the second meshing gear 28.

[0034] A rotor module connecting sleeve 34 for connecting the rotor module 1 is provided along the side wall of the housing 3, and the rotor module connecting sleeve 34 is communicated with the transmission cavity 33 of the housing 3. Specifically, a first bearing ring groove 35 is provided in the rotor module connecting sleeve 34, and the first bearing ring groove 35 is used to embed the bearing sleeve 19, so that the free rotation of the rotor shaft 11 relative to the housing 3 can be ensured.

[0035] like Figure 4 As shown, as an optimization of the rotor shaft 11, the centers of the first step 12, the second step 13, the third step 14 and the fourth step 15 are located on the same central axis, and the outer diameter of the first step 12 is smaller than the outer diameter of the second step 13, the outer diameter of the second step 13 is smaller than the outer diameter of the third step 14, and the outer diameter of the third step 14 is smaller than the outer diameter of the fourth step 15.

[0036] As connection requirements for the fan 16 , the first bearing 17 and the first meshing gear 18 , the height of the fan 16 is smaller than the height of the fourth step 15 , the height of the first bearing 17 is larger than the height of the third step 14 , and the height of the first meshing gear 18 is larger than the height of the second step 13 .

[0037] The fan 16 in this embodiment is used to cool the transmission components.

[0038] Example 2

[0039] like Figure 5 and 6As shown, the output shaft module 2 includes an output shaft 21, and a cylindrical fifth step 22, a sixth step 23, a seventh step 24 and a workpiece connecting portion 25 (the outer wall of the workpiece connecting portion 25 is provided with a thread for screwing with the workpiece) are sequentially arranged in the opposite direction of the end of the output shaft 21; a second bearing 26 and a second meshing gear 28 are sleeved on the sixth step 23, the bottom of the second bearing 26 is in contact with the top of the seventh step 24, and the top of the second bearing 26 is in contact with the bottom of the second meshing gear 28; a third bearing 27 is sleeved on the fifth step 22; the second bearing 26, the third bearing 27 and the second meshing gear 28 are encapsulated in the housing 3.

[0040] like Figure 5 As shown, as an optimization of the output shaft 21, the centers of the fifth step 22, the sixth step 23, the seventh step 24 and the workpiece connecting portion 25 are located on the same central axis, and the outer diameter of the fifth step 22 is smaller than the outer diameter of the sixth step 23, the outer diameter of the sixth step 23 is smaller than the outer diameter of the seventh step 24, and the outer diameter of the seventh step 24 is larger than the outer diameter of the workpiece connecting portion 25.

[0041] Example 3

[0042] like Figure 7-8 As shown, the housing 3 is cylindrical, one end of which is provided with an output shaft port 31 for the output shaft 21 to extend out, and the other end is sealed by a matching end cover 32 to form a transmission cavity 33.

[0043] The end cover 32 includes a conical cap 310 and a cylindrical limiting sleeve 311 with an inner cavity that are connected to each other. The conical cap 310 is used to be connected to the housing 3, and the limiting sleeve 311 is located in the transmission cavity 33; a third bearing ring groove 37 for embedding the third bearing 27 and an output shaft ring groove 38 for movable limiting the top of the output shaft 21 are opened along the inner wall of the limiting sleeve 311; a second bearing ring groove 36 for embedding the second bearing 26 is opened at the position of the transmission cavity 33 corresponding to the output shaft port 31.

[0044] In order to ensure that the second meshing gear 28 has enough rotation space, the second meshing gear 28 is located between the limiting sleeve 311 and the second bearing 26; in this embodiment, the seventh step 24 corresponds to the output shaft port 31; the workpiece connecting portion 25 extends out of the output shaft port 31.

[0045] like Figure 8As shown, as an optimization of the connection between the shell 3 and the end cover 32 in this embodiment, an end cover annular groove 39 is opened on the inner wall corresponding to the top of the shell 3; the conical cap 310 also includes an annular flange 312 that can match the end cover annular groove 39, the height of the end cover annular groove 39 is greater than the height of the annular flange 312, and the annular flange 312 and the end cover annular groove 39 are riveted by a riveting machine, and the sealing effect is good.

[0046] As a further optimization of the shell 3, a dust cover mounting groove 314 for mounting a dust cover is provided along the outer wall of the output shaft port 31; an annular dust cover groove 313 is also provided along the end of the output shaft port 31; the dust cover mounting groove 314 and the dust cover groove 313 are both used to block dust or residue generated during work to protect the operator's operation safety.

[0047] The shell in this embodiment is made of metal, but is not limited to aluminum alloy or stainless steel.

[0048] In the above embodiment, the first meshing gear 18 and the second meshing gear 28 may be spiral bevel gears, and the teeth thereof mesh with each other.

[0049] The above description is only for illustrating the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A handheld electric tool, characterized in that: It includes a rotor module and an output shaft module, wherein the rotor module and the output shaft module are connected through a shell, and within the cavity of the shell, the rotor module can drive the output shaft module to rotate clockwise or counterclockwise; The rotor module comprises a rotor shaft arranged at the axis position, and a cylindrical first step, a second step, a third step and a fourth step connected in sequence are arranged in sequence along the reverse direction of the end of the rotor shaft; the fourth step sleeve is provided with a fan, the third step sleeve is provided with a first bearing, the second step sleeve is provided with a first meshing gear, the first step can extend out of the first meshing gear, and the end of the first step is limited to the first meshing gear by riveting; a bearing sleeve is provided along the outer ring sleeve of the first bearing, and the bearing sleeve is used to be embedded in the housing; The centers of the first step, the second step, the third step and the fourth step are located on the same central axis, and the outer diameter of the first step is smaller than the outer diameter of the second step, the outer diameter of the second step is smaller than the outer diameter of the third step, and the outer diameter of the third step is smaller than the outer diameter of the fourth step; The output shaft module comprises an output shaft, and a cylindrical fifth step, a sixth step, a seventh step and a workpiece connecting portion are sequentially arranged in the reverse direction of the end of the output shaft; a second bearing and a second meshing gear are sleeved on the sixth step, the bottom of the second bearing abuts against the top of the seventh step, and the top of the second bearing abuts against the bottom of the second meshing gear; a third bearing is sleeved on the fifth step; the second bearing, the third bearing and the second meshing gear are encapsulated in the housing; The centers of the fifth step, the sixth step, the seventh step and the workpiece connecting portion are located on the same central axis, and the outer diameter of the fifth step is smaller than the outer diameter of the sixth step, the outer diameter of the sixth step is smaller than the outer diameter of the seventh step, and the outer diameter of the seventh step is larger than the outer diameter of the workpiece connecting portion.

2. A handheld electric tool according to claim 1, characterized in that: The height of the fan is smaller than the height of the fourth step, the height of the first bearing is larger than the height of the third step, and the height of the first meshing gear is larger than the height of the second step.

3. A handheld electric tool according to claim 1, characterized in that: The shell is cylindrical, with an output shaft port for the output shaft to extend out being provided at one end, and a transmission cavity being formed by a matching end cover seal at the other end; a rotor module connecting sleeve for connecting the rotor module is provided along the side wall of the shell, and the rotor module connecting sleeve is connected to the transmission cavity.

4. A handheld electric tool according to claim 3, characterized in that: The end cover includes a conical cap and a limiting sleeve which are connected to each other, the conical cap is used to be connected to the housing, and the limiting sleeve is located in the transmission cavity; a third bearing ring groove for embedding the third bearing and an output shaft ring groove for limiting the top activity of the output shaft are provided along the inner wall of the limiting sleeve; a second bearing ring groove for embedding the second bearing is provided at the transmission cavity position corresponding to the output shaft port; the second meshing gear is located between the limiting sleeve and the second bearing; the seventh step corresponds to the output shaft port.

5. A handheld electric tool according to claim 4, characterized in that: An end cover annular groove is provided on the inner wall corresponding to the top of the shell, and the conical cover cap also includes an annular flange that can match the end cover annular groove, the height of the end cover annular groove is greater than the height of the annular flange, and the annular flange is connected to the end cover annular groove by riveting.

6. A handheld electric tool according to claim 3, characterized in that: A dust cover installation groove for installing a dust cover is provided along the outer wall of the output shaft port; and an annular dust cover groove is also provided along the end of the output shaft port.

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