Transmission mechanism for electric tool and electric tool with transmission mechanism

Abstract

The utility model relates to a transmission mechanism for an electric tool and the electric tool with the transmission mechanism, the transmission mechanism comprises a speed reduction unit, the speed reduction unit is provided with a first bevel gear and a second bevel gear, the first transmission gear and the second transmission gear are arranged on the same side of a rotating shaft, and the axis of a first speed reduction shaft and the axis of a second speed reduction shaft are parallel to each other; a bidirectional sealing structure of the rotating shaft and the second speed reducing shaft is provided; the locking unit is arranged on the same direction side of the second speed reduction shaft and the first speed reduction shaft and is in the same plane; the utility model further relates to the electric tool with the transmission mechanism, the transmission mechanism is reliable in transmission, convenient and rapid to disassemble, assemble and maintain and long in service life, and therefore the electric tool comprising the transmission mechanism also has the corresponding advantages.

Description

Technical Field

[0001] The present application relates to the technical field of electric tools, and in particular to a transmission mechanism for electric tools and an electric tool having the transmission mechanism. Background Art

[0002] In the field of electric tools, especially in tools such as cutting machines and slotting machines, a two-stage reduction transmission mechanism is required for torque output. Since there is a lot of water, dust and mud in the working environment of tools such as cutting machines and slotting machines, the rationality of the transmission mechanism design and the reliability of the seal directly determine the average failure rate of the whole machine.

[0003] In the prior art, this type of transmission mechanism design is mostly divided into two types:

[0004] Reference Figure 1 As shown, the structure of the first reduction unit is that the first bevel gear a1, the second bevel gear a2, the first transmission gear a3 and the second transmission gear a4 are distributed on both sides of the rotating shaft, and the structure is very inconvenient to disassemble and repair.

[0005] Reference Figure 2 As shown, the structure of the second reduction unit is that the axes of the first reduction shaft b1 and the second reduction shaft b2 are perpendicular to each other, which requires a relatively large installation space, which is very unfavorable for the compact design of the power tool. In addition, the structure of the transmission mechanism itself is also relatively complex, and the manufacturing cost is relatively high.

[0006] The above contents are only used to assist in understanding the technical solution of the present application, and do not constitute an admission that the above contents are the closest prior art to the present application. Summary of the invention

[0007] Based on this, the present application provides a transmission mechanism for an electric tool and an electric tool having the transmission mechanism to solve one of the above-mentioned technical problems.

[0008] The technical solution adopted by the present application to solve its technical problems is: a transmission mechanism for an electric tool, comprising: an electric tool body; a motor, providing driving force for the electric tool; a reduction unit, comprising: a first bevel gear, connected to the motor through a rotating shaft; a second bevel gear, meshing with the first bevel gear; a first transmission gear, connected to the first bevel gear through a first reduction shaft; a second transmission gear, meshing with the first transmission gear, with a second reduction shaft installed at its axis, the second reduction shaft being used to connect a working head; a locking unit, cooperating with the second transmission gear, for locking the rotating shaft; a total of two bidirectional sealing structures, divided into a first bidirectional sealing structure and a second bidirectional sealing structure, the first bidirectional sealing structure being used to seal the rotating shaft, and the second bidirectional sealing structure being used to seal the second reduction shaft; the first bevel gear is driven by the rotating shaft, and the second reduction shaft is driven via the second bevel gear, the first transmission gear, the first reduction shaft and the second transmission gear.

[0009] In some embodiments, the second bevel gear has a larger number of teeth than the first bevel gear, the rotation speed of the second bevel gear decreases, and the torque increases accordingly, thereby decelerating the first reduction shaft.

[0010] In some embodiments, the second transmission gear has a larger number of teeth than the first transmission gear, the rotation speed of the second transmission gear decreases, and the torque increases accordingly, thereby decelerating the second reduction shaft.

[0011] In some embodiments, an axis of the first reduction shaft and an axis of the second reduction shaft are parallel to each other.

[0012] In some embodiments, a locking hole is formed on the second transmission gear.

[0013] In some embodiments, the locking unit includes: a locking shaft, used to cooperate with the locking hole; an operating button, installed on the top of the locking shaft, for pressing operation; a spring, one end of which is connected to the operating button, and the other end is connected to the outer shell of the power tool body to provide a reset force for the locking shaft; a sealing gasket, installed on the locking shaft for sealing.

[0014] In some embodiments, when viewed from the forward direction, the first reduction shaft and the second reduction shaft are in the same plane and are on the same side of the rotation axis.

[0015] In some embodiments, the first bidirectional sealing structure includes: an O-ring, which is installed on the rotating shaft through a flange, and the flange is also used to press the bearing installed on the rotating shaft; a first skeleton oil seal, which is arranged in the flange and is used to seal the rotating shaft.

[0016] In some embodiments, the second bidirectional sealing structure includes: a labyrinth seal ring, which is a non-contact labyrinth seal ring, disposed on the second reduction shaft; and a second skeleton oil seal, which is disposed on the second reduction shaft and is used to seal the second reduction shaft.

[0017] On the other hand, the present application provides an electric tool, which has a transmission mechanism as shown in any of the above embodiments.

[0018] The beneficial effects of the present application are that the first bevel gear, the second bevel gear, the first transmission gear and the second transmission gear in the reduction unit are distributed on the same side of the rotating shaft, the axes of the first reduction shaft and the second reduction shaft are parallel to each other, and a bidirectional sealing structure is arranged on the first reduction shaft and the second reduction shaft, which optimizes the rationality and reliability of the transmission mechanism design, reduces the average failure rate of the whole machine, is easy to disassemble and maintain, and has a compact structure, so that it is possible to save installation space, simplify the structure of the transmission mechanism itself and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the first type of deceleration unit in the prior art of this application.

[0021] Figure 2 This is a schematic diagram of the second deceleration unit in the prior art of this application.

[0022] Figure 3 It is a schematic diagram of a partial cross-section in the forward direction of the present application.

[0023] Figure 4 It is a three-dimensional schematic diagram of this application.

[0024] Figure 5 It is a schematic diagram of the reduction unit of the present application.

[0025] Explanation of the accompanying drawings: 1. Power tool body, 2. Motor, 3. Reduction unit, 301. First bevel gear, 302. Second bevel gear, 303. First transmission gear, 304. Second transmission gear, 305. First reduction shaft, 306. Second reduction shaft, 4. Rotating shaft, 5. Locking unit, 501. Locking shaft, 502. Operating button, 503. Spring, 504. Sealing gasket, 6. First bidirectional sealing structure, 601. O-ring, 602. First skeleton oil seal, 7. Second bidirectional sealing structure, 701. Labyrinth seal, 702. Second skeleton oil seal, 8. Locking hole, 9. Flange. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection of this application.

[0027] In the embodiments of this application, please refer to Figure 1-5 As shown, the transmission mechanism for the electric tool and the electric tool with the transmission mechanism mainly include: an electric tool body 1; a motor 2, which provides driving force for the electric tool; a reduction unit 3, including: a first bevel gear 301, which is connected to the motor 2 through a rotating shaft 4; a second bevel gear 302, which is meshed with the first bevel gear 301; a first transmission gear 303, which is connected to the first bevel gear 301 through a first reduction shaft 305; a second transmission gear 304, which is meshed with the first transmission gear 303, and a second reduction shaft 306 is installed at its axis, and the second reduction shaft 306 is used to connect the working head ( The working head can be an angle grinder, a saw blade, a drill bit, etc.); a locking unit 5, which cooperates with the second transmission gear 304 to lock the rotating shaft 4; a two-way sealing structure, a total of two, is divided into a first two-way sealing structure 6 and a second two-way sealing structure 7, the first two-way sealing structure 6 is used to seal the rotating shaft 4, and the second two-way sealing structure 7 is used to seal the second reduction shaft 306; the first bevel gear 301 is driven by the rotating shaft 4, and the second reduction shaft 306 is driven via the second bevel gear 302, the first transmission gear 303, the first reduction shaft 305 and the second transmission gear 304.

[0028] The motor 2 drives the rotating shaft 4 to rotate the first bevel gear 301 on the rotating shaft 4, and the first bevel gear 301 drives the second bevel gear 302 to rotate, so that the first reduction shaft 305 is driven, and then drives the first transmission gear 303, drives the second transmission gear 304 meshing with the first transmission gear 303, so that the second reduction shaft 306 is driven, and drives the working head to rotate.

[0029] Some preferred / improved embodiments based on the above embodiments will be described below. Any one of the following embodiments may be selected, or multiple embodiments may be selected and combined.

[0030] like Figure 3 or Figure 5 As shown, the second bevel gear 302 has more teeth than the first bevel gear 301. When the first bevel gear 301 drives the second bevel gear 302, the speed of the second bevel gear 302 decreases, so that the speed of the first reduction shaft 305 is lower than that of the rotating shaft 4, and the torque increases accordingly.

[0031] Furthermore, the number of teeth of the second transmission gear 304 is greater than that of the first transmission gear 303. When the first transmission gear 303 drives the second transmission gear 304, the speed of the second transmission gear 304 is reduced, so that the speed of the second reduction shaft 306 is lower than that of the first reduction shaft 305, and the torque will increase accordingly, so that the output force of the working head is greater.

[0032] Specifically, compared with the problem that the prior art requires a relatively large installation space, such as the attached Figure 2 The reduction unit 3 shown in the present application has made the following improvements: the axis of the first reduction shaft 305 and the axis of the second reduction shaft 306 are parallel to each other, the required installation space is smaller, the design is compact, and the manufacturing cost is reduced.

[0033] Furthermore, the second transmission gear 304 is provided with locking holes 8 , and there are a plurality of locking holes 8 distributed in a circular array on the second transmission gear 304 .

[0034] Furthermore, the locking unit 5 includes: a locking shaft 501, used to cooperate with the locking hole 8 to lock the second transmission gear 304, so as to achieve the purpose of locking the rotating shaft 4; an operating button 502, installed on the top of the locking shaft 501, for pressing operation; a spring 503, one end of which is connected to the operating button 502, and the other end is connected to the outer shell of the power tool body 1, to provide a reset force for the locking shaft 501; a sealing gasket 504, installed on the locking shaft 501, for sealing.

[0035] Furthermore, compared with the problem of inconvenient disassembly of the structure in the prior art, the attached Figure 1The reduction unit 3 shown in the present application has made the following improvements: looking from the forward direction, the first reduction shaft 305 and the second reduction shaft 306 are in the same plane and are on the same side of the rotating shaft 4; the second bevel gear 302 and the first transmission gear 303 installed on the first reduction shaft 305 are distributed up and down and are both below the axis of the rotating shaft 4; the second transmission gear 304 installed on the second reduction shaft 306 and meshing with the first transmission gear 303 is also below the axis of the rotating shaft 4 for easy disassembly and repair.

[0036] Specifically, the first bidirectional sealing structure 6 includes: an O-ring 601, which is installed on the rotating shaft 4 through a flange 9, and the flange 9 is also used to tighten the bearing installed on the rotating shaft 4, and the compression degree of the bearing can be adjusted according to usage; a first skeleton oil seal 602, which is arranged in the flange 9 and is used to seal the rotating shaft 4.

[0037] Furthermore, the second bidirectional sealing structure 7 includes: a labyrinth seal ring 701, which is a non-contact labyrinth seal ring 701, which is arranged on the second reduction shaft 306. During the sealing process of the labyrinth seal, there is no direct contact between the rotating parts and the fixed parts, thereby avoiding wear and heat caused by friction; a second skeleton oil seal 702, which is arranged on the second reduction shaft 306 and is used to seal the second reduction shaft 306.

[0038] In the above content, the first skeleton oil seal 602 and the second skeleton oil seal 702 are used to isolate the parts in the transmission components that need lubrication from the external environment or the output parts to prevent the leakage of lubricating oil. Specifically in this embodiment, it is mainly aimed at the rotating shaft 4 and the second reduction shaft 306.

[0039] For example Figure 4 As shown, the present application provides an electric tool having a transmission mechanism as shown in any of the above embodiments.

[0040] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the present application, and the aforementioned embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A transmission mechanism for an electric tool, characterized in that: include: Power tool body; The motor provides driving force for the power tool; Reduction unit, comprising: A first bevel gear connected to the motor via a rotating shaft; A second bevel gear meshing with the first bevel gear; A first transmission gear connected to the first bevel gear via a first reduction shaft; The second transmission gear meshes with the first transmission gear, and a second reduction shaft is installed at the axis of the second transmission gear, and the second reduction shaft is used to connect the working head; A locking unit, cooperating with the second transmission gear, for locking the rotating shaft; Two bidirectional sealing structures, divided into a first bidirectional sealing structure and a second bidirectional sealing structure, wherein the first bidirectional sealing structure is used to seal the rotating shaft, and the second bidirectional sealing structure is used to seal the second reduction shaft; The first bevel gear is driven by the rotating shaft, and the second reduction shaft is driven via the second bevel gear, the first transmission gear, the first reduction shaft, and the second transmission gear.

2. The transmission mechanism for an electric tool according to claim 1, characterized in that: The number of teeth of the second bevel gear is greater than that of the first bevel gear, the rotation speed of the second bevel gear is reduced, and the torque is increased accordingly, so that the first reduction shaft is decelerated.

3. The transmission mechanism for an electric tool according to claim 1, characterized in that: The number of teeth of the second transmission gear is greater than that of the first transmission gear, the rotation speed of the second transmission gear is reduced, and the torque is increased accordingly, so that the second reduction shaft is decelerated.

4. The transmission mechanism for an electric tool according to claim 1, characterized in that: An axis of the first reduction shaft and an axis of the second reduction shaft are parallel to each other.

5. The transmission mechanism for an electric tool according to claim 1, characterized in that: The second transmission gear is provided with a locking hole.

6. The transmission mechanism for an electric tool according to claim 5, characterized in that: The locking unit comprises: A locking shaft, used to cooperate with the locking hole; An operating button, mounted on the top of the locking shaft, for pressing operation; A spring, one end of which is connected to the operating button and the other end of which is connected to the housing of the power tool body, providing a resetting force for the locking shaft; Sealing washer, installed on the locking shaft, for sealing.

7. The transmission mechanism for an electric tool according to claim 1, characterized in that: Looking forward, the first reduction shaft and the second reduction shaft are in the same plane and on the same side of the rotation axis.

8. The transmission mechanism for an electric tool according to claim 1, characterized in that: The first bidirectional sealing structure comprises: An O-shaped sealing ring is mounted on the rotating shaft through a flange, and the flange is also used to press the bearing mounted on the rotating shaft; The first skeleton oil seal is arranged in the flange and is used for sealing the rotating shaft.

9. The transmission mechanism for an electric tool according to claim 1, characterized in that: The second bidirectional sealing structure comprises: A labyrinth seal ring is a non-contact labyrinth seal ring and is arranged on the second reduction shaft; The second skeleton oil seal is arranged on the second reduction shaft and is used for sealing the second reduction shaft.

10. An electric tool, characterized in that: The electric tool has a transmission mechanism as claimed in any one of claims 1-9.

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