Electric tool

Abstract

The utility model discloses an electric tool which comprises a gear box, a shaft sleeve and an output shaft. A containing cavity is formed in the gearbox; at least part of the shaft sleeve is installed in the containing cavity, the shaft sleeve is provided with a shaft hole, an oil storage groove and a communicating groove are formed in the inner wall of the shaft hole in the circumferential direction of the shaft hole, the communicating groove is communicated with the oil storage groove, and one end of the communicating groove extends to the end face of the shaft sleeve and is communicated with the containing cavity; the output shaft comprises a shaft rod and a connecting piece connected to the axial end of the shaft rod, the connecting piece is installed in the containing cavity, the shaft rod is in sliding connection with the shaft hole, and the end, away from the connecting piece, of the shaft rod protrudes out of the shaft sleeve and the containing cavity. The electric tool can achieve long-term lubrication of the shaft sleeve and the output shaft.

Description

Technical Field

[0001] The utility model belongs to the technical field of power tools, and particularly relates to a power tool. Background Art

[0002] In power tools with impact structures such as impact screwdrivers, an oil storage groove is usually provided on the output shaft or the shaft sleeve, and an oil delivery hole is opened on the output shaft to ensure the lubrication between the two. However, the existing impact screwdriver needs to be as short as possible in overall length, so that the output shaft also needs to be shortened as much as possible. This leads to the situation that there is not enough space to set an oil delivery hole on the output shaft when there is already a hexagon socket for the bit, and the long-term lubrication cannot be achieved.

[0003] The information disclosed in this background art section is only intended to enhance the overall understanding of the utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a power tool that can achieve long-term lubrication between the shaft sleeve and the output shaft.

[0005] To achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows: A power tool, comprising:

[0006] A gearbox, which has an accommodation cavity therein;

[0007] A shaft sleeve, at least partially installed in the accommodation cavity. The shaft sleeve has a shaft hole, and an oil storage groove and a communication groove are provided along the circumferential direction of the inner wall of the shaft hole. The communication groove is connected to the oil storage groove, and one end of the communication groove extends to the end face of the shaft sleeve and is connected to the accommodation cavity;

[0008] An output shaft, comprising a shaft rod and a connector connected to one axial end of the shaft rod. The connector is installed in the accommodation cavity. The shaft rod is slidably connected to the shaft hole, and one end of the shaft rod away from the connector protrudes out of the shaft sleeve and the accommodation cavity.

[0009] In one or more embodiments of the utility model, two communication grooves are provided at intervals on the inner wall of the shaft hole.

[0010] In one or more embodiments of the utility model, a sealing groove is provided along the circumferential direction of the inner wall of the shaft hole. The sealing groove is arranged at an interval from the oil storage groove, and the sealing groove is located on the side of the oil storage groove away from the communication groove. A sealing ring is installed in the sealing groove; the sealing ring is sealingly connected to the shaft rod.

[0011] In one or more embodiments of the utility model, the gearbox is provided with a mounting hole, and the shaft sleeve is fixedly installed in the mounting hole.

[0012] In one or more embodiments of the present utility model, a limiting groove is provided on the inner wall of the mounting hole, a limiting protrusion is provided on the outer peripheral wall of the shaft sleeve, and the limiting protrusion is inserted into the limiting groove.

[0013] In one or more embodiments of the present utility model, along the axial direction of the output shaft, the connecting member abuts against the inner wall of the gearbox.

[0014] In one or more embodiments of the present utility model, along the axial direction of the output shaft, a gasket is provided between the connecting member and the inner wall of the gearbox.

[0015] In one or more embodiments of the present utility model, an installation groove is provided on the inner wall of the gearbox, and along the axial direction of the output shaft, a part of the gasket is installed in the installation groove.

[0016] In one or more embodiments of the present utility model, a guiding surface is provided at one end of the shaft hole axially facing the connecting member.

[0017] In one or more embodiments of the present utility model, a connecting groove is provided on one side of the connecting member facing away from the shaft rod, and the power tool further includes an impact mechanism, and the impact mechanism is inserted into the connecting groove.

[0018] Compared with the prior art, in the power tool of the present utility model, by providing an oil storage groove and a communication groove in the shaft sleeve, the oil storage groove is communicated with the accommodation cavity of the gearbox through the communication groove, and the grease in the oil storage groove and the communication groove can play a role in lubricating the shaft sleeve and the output shaft; in addition, when the output shaft is working (rotating and moving linearly along the axial direction), the connecting member of the output shaft can scrape the grease in the accommodation cavity of the gearbox into the communication groove, and the grease then flows into the oil storage groove through the communication groove, further ensuring long-term lubrication between the shaft sleeve and the output shaft. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a partial sectional view of a power tool in an embodiment of the present utility model;

[0021] Figure 2 It is a three-dimensional view of a shaft sleeve in an embodiment of the present utility model;

[0022] Figure 3The front view of the bushing in an embodiment of the present utility model;

[0023] Figure 4 is Figure 3 the sectional view at AA in

[0024] Figure 5 is Figure 3 the sectional view at BB in

[0025] Description of main reference numerals:

[0026] 1. Gearbox; 11. Accommodating cavity; 12. Mounting hole; 13. Limiting groove; 14. Mounting groove; 2. Bushing; 21. Shaft hole; 22. Oil storage groove; 23. Connecting groove; 24. Sealing groove; 25. Limiting protrusion; 26. Guiding surface; 3. Output shaft; 31. Shaft rod; 32. Connecting piece; 33. Connecting groove; 4. Gasket; 5. Impact mechanism; 6. Sealing ring. Detailed implementation manners

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] As Figures 1 to 5 shown,

[0029] An electric tool in an embodiment of the present utility model includes a gearbox 1, a bushing 2 and an output shaft 3; the gearbox 1 has an accommodating cavity 11 therein; at least a part of the bushing 2 is installed in the accommodating cavity 11, the bushing 2 has a shaft hole 21, an oil storage groove 22 and a connecting groove 23 are formed on the inner wall of the shaft hole 21 along its circumferential direction, the connecting groove 23 is communicated with the oil storage groove 22, and one end of the connecting groove 23 extends to the end face of the bushing 2 and is communicated with the accommodating cavity 11; the output shaft 3 includes a shaft rod 31 and a connecting piece 32 connected to one axial end of the shaft rod 31, the connecting piece 32 is installed in the accommodating cavity 11, the shaft rod 31 is slidably connected with the shaft hole 21, and one end of the shaft rod 31 far from the connecting piece 32 protrudes out of the bushing 2 and the accommodating cavity 11.

[0030] It should be noted that, in order to facilitate the description of the electric tool of the present utility model, an electric tool with an impact structure such as an impact screwdriver is taken as an example for description.

[0031] It should be noted that in this power tool, an oil storage groove 22 and a communication groove 23 are provided in the bushing 2. The grease in the oil storage groove 22 and the communication groove 23 can play a role in lubricating the bushing 2 and the output shaft 3. In addition, the oil storage groove 22 is communicated with the accommodation cavity 11 of the gearbox 1 through the communication groove 23. During the working process of impact-type structures such as impact screwdrivers, the output shaft 3 not only rotates along its axial direction but also vibrates along its axial direction (i.e., linear reciprocating motion along the axial direction). In the present utility model, the oil storage groove 22 is communicated with the accommodation cavity 11 of the gearbox 1 through the communication groove 23. That is, during the working process of impact-type structures such as impact screwdrivers, the connecting member 32 of the output shaft 3 can scrape the grease in the accommodation cavity 11 of the gearbox 1 into the communication groove 23, and the grease then flows into the oil storage groove 22 through the communication groove 23, further ensuring long-term lubrication between the bushing 2 and the output shaft 3.

[0032] Preferably, in this embodiment, the extending direction of the communication groove is the axial direction of the shaft hole 21. The shaft rod 31 and the connecting member 32 can be integrally formed, and the shaft rod 31 and the connecting member 32 are in a T shape.

[0033] As Figures 2 to 4 shown, in this embodiment, two communication grooves 23 are provided at intervals on the inner wall of the shaft hole 21. Such a setting can ensure that grease flows into the oil storage groove 22 through the communication groove 23. In other embodiments, more than two communication grooves 23 can also be provided at intervals on the inner wall of the shaft hole 21 to ensure uniform distribution of the grease in the bushing 2.

[0034] In a specific embodiment, a sealing groove 24 is provided along the circumferential direction of the inner wall of the shaft hole 21. The sealing groove 24 is spaced from the oil storage groove 22, and the sealing groove 24 is located on the side of the oil storage groove 22 away from the communication groove 23. A sealing ring 6 is installed in the sealing groove 24. Along the radial direction of the shaft hole 21, the sealing ring 6 is in sealing connection with the shaft rod 31. The sealing connection between the sealing ring 6 and the shaft rod 31 can be understood as that the sealing ring 6 and the shaft rod 31 are in close contact with each other, so as to prevent external dust from entering the accommodation cavity 11 from between the inner wall of the shaft hole 21 and the shaft rod 31, playing a role in dust prevention. The sealing ring 6 can be a sealing ring 6 made of rubber material or polymer material that can be purchased on the market.

[0035] In a specific embodiment, the gearbox 1 is provided with an installation hole 12, and the bushing 2 is fixedly installed in the installation hole 12. The cooperation between the bushing 2 and the installation hole 12 plays a role in ensuring the stable installation of the bushing 2 on the gearbox 1.

[0036] Furthermore, a limiting groove 13 is provided on the inner wall of the installation hole 12, and a limiting protrusion 25 is provided on the outer peripheral wall of the bushing 2. The limiting protrusion 25 is inserted into the limiting groove 13. The insertion of the limiting protrusion 25 into the limiting groove 13 plays a role in restricting the movement of the bushing 2 in the axial direction of the bushing 2.

[0037] AsFigure 1 As shown, along the axial direction of the output shaft 3 , the connecting member 32 can abut against the inner wall of the gear box 1 , and such a setting plays a role in limiting the connecting member 32 along the axial direction of the output shaft 3 .

[0038] Furthermore, a gasket 4 is provided between the connector 32 and the inner wall of the gearbox 1 along the axial direction of the output shaft 3. The gasket 4 can be a common elastic gasket 4 on the market, such as a gasket 4 made of rubber material; the gasket 4 plays a role in protecting the inner wall of the gearbox 1.

[0039] Furthermore, a mounting groove 14 is provided on the inner wall of the gearbox 1, and the gasket 4 is partially installed in the mounting groove 14 along the axial direction of the output shaft 3. The mounting groove 14 serves to limit the installation position of the gasket 4, and the gasket 4 can be bonded in the mounting groove 14.

[0040] like Figures 2 to 5 As shown, a guide surface 26 is provided at one end of the shaft hole 21 axially facing the connecting member 32. The guide surface 26 is arranged obliquely with respect to the axial direction of the shaft hole 21, and plays a role in guiding the shaft rod 31 to be inserted into the shaft hole 21.

[0041] In a specific embodiment, a connecting groove 33 is provided on the side of the connecting member 32 away from the shaft 31, and the electric tool further comprises an impact mechanism 5, which is plugged into the connecting groove 33. The impact structure plays a role in driving the output shaft 3 to rotate along its axial direction and vibrate along its axial direction. The impact mechanism 5 is a common impact mechanism or impact device in electric tools with impact structures such as existing impact screwdrivers.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electric tool, characterized in that: include: A gear box (1) having a receiving chamber (11) therein; A shaft sleeve (2) is at least partially installed in the accommodating cavity (11), the shaft sleeve (2) having an axial hole (21), an oil storage groove (22) and a connecting groove (23) being provided on the inner wall of the axial hole (21) along its circumference, the connecting groove (23) being connected to the oil storage groove (22), one end of the connecting groove (23) extending to the end surface of the shaft sleeve (2) and being connected to the accommodating cavity (11); The output shaft (3) comprises a shaft rod (31) and a connecting piece (32) connected to one axial end of the shaft rod (31); the connecting piece (32) is installed in the accommodating cavity (11); the shaft rod (31) is slidably connected to the shaft hole (21); and one end of the shaft rod (31) away from the connecting piece (32) protrudes out of the shaft sleeve (2) and the accommodating cavity (11).

2. The electric tool according to claim 1, characterized in that: Two communicating grooves (23) are arranged at intervals on the inner wall of the shaft hole (21).

3. The electric tool according to claim 1, characterized in that: A sealing groove (24) is provided on the inner wall of the shaft hole (21) along its circumference. The sealing groove (24) is spaced apart from the oil storage groove (22), and the sealing groove (24) is located on a side of the oil storage groove (22) away from the connecting groove (23). A sealing ring (6) is installed in the sealing groove (24); the sealing ring (6) is sealingly connected to the shaft rod (31).

4. The electric tool according to claim 1, characterized in that: The gear box (1) is provided with a mounting hole (12), and the shaft sleeve (2) is fixedly mounted in the mounting hole (12).

5. The electric tool according to claim 4, characterized in that: A limiting groove (13) is provided on the inner wall of the mounting hole (12), and a limiting protrusion (25) is provided on the outer peripheral wall of the shaft sleeve (2), and the limiting protrusion (25) is plugged into the limiting groove (13).

6. The electric tool according to claim 1, characterized in that: Along the axial direction of the output shaft (3), the connecting piece (32) abuts against the inner wall of the gear box (1).

7. The electric tool according to claim 6, characterized in that: Along the axial direction of the output shaft (3), a gasket (4) is provided between the connecting piece (32) and the inner wall of the gear box (1).

8. The electric tool according to claim 7, characterized in that: The inner wall of the gear box (1) is provided with a mounting groove (14), and along the axial direction of the output shaft (3), a portion of the gasket (4) is mounted in the mounting groove (14).

9. The electric tool according to claim 1, characterized in that: A guide surface (26) is provided at one end of the shaft hole (21) axially facing the connecting piece (32).

10. The electric tool according to claim 1, characterized in that: A connecting groove (33) is provided on the side of the connecting member (32) facing away from the shaft (31), and the electric tool further comprises an impact mechanism (5), wherein the impact mechanism (5) is plugged into the connecting groove (33).

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