Electric tool

Abstract

The utility model relates to an electric tool, which comprises a gear box, a gear box, a transmission shaft and a transmission shaft, the motor is positioned at the rear part of the gear box and comprises a driving shaft; the first bearing comprises a bearing outer ring and a bearing inner ring, the bearing outer ring is mounted in the mounting groove, and the driving shaft is sleeved with the bearing inner ring; the bearing sealing ring is connected to the driving shaft in a sleeving manner, and the first bearing and the mounting groove jointly clamp the bearing sealing ring; a first annular protruding part is arranged on the front surface of the bearing sealing ring, and the first annular protruding part is tightly attached to the groove bottom wall of the installation groove. According to the electric tool, the bearing sealing ring is arranged between the first bearing and the mounting groove of the gear box, the bearing sealing ring is connected with the driving shaft in a sleeved mode, and the first annular protruding part is arranged on the bearing sealing ring so that the bearing sealing ring can be tightly attached to the bottom wall of the groove. Lubricating oil in the gearbox can be prevented from leaking through a bearing chamber of the first bearing and an assembly gap between the bearing outer ring and the mounting groove.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to an electric tool. Background Art

[0002] The electric tool mainly includes a motor, a gear reduction mechanism, a gear box and an output shaft. The gear box is used to accommodate the gear reduction mechanism. The high speed generated by the motor is decelerated by the gear reduction mechanism and then transmitted to the output shaft, which drives the tool head to rotate and work. In order to reduce the wear of the gear reduction mechanism, lubricating oil is applied between the various parts of the gear reduction mechanism, and lubricating grease is filled in the cavity between the front end surface of the gear reduction mechanism and the inner wall of the gear box. During the operation of the electric tool, the lubricating oil is easy to leak from the assembly of the gear box and the outer ring of the motor bearing and from the gap between the outer ring of the bearing and the inner ring of the bearing, which will cause the friction of the gear reduction mechanism to increase due to the loss of lubricating oil, thereby reducing its life. In addition, if the leaked grease flows to the outside of the casing, it will also affect the user experience. Utility Model Content

[0003] Based on the above defects in the prior art, the purpose of the present invention is to provide a

[0004] To this end, the utility model provides the following technical solutions.

[0005] The utility model provides an electric tool, comprising:

[0006] A gear box having a mounting groove formed on its rear end surface;

[0007] a motor located at the rear of the gearbox and comprising a drive shaft;

[0008] A first bearing, comprising a bearing outer ring and a bearing inner ring, wherein the bearing outer ring is mounted in the mounting groove, and the bearing inner ring is sleeved on the drive shaft;

[0009] A bearing sealing ring is sleeved on the drive shaft, and the first bearing and the mounting groove jointly clamp the bearing sealing ring; a first annular protrusion is provided on the front surface of the bearing sealing ring, and the first annular protrusion is tightly attached to the bottom wall of the mounting groove.

[0010] Optionally, the bearing sealing ring is an elastic structure, and the first annular protrusion squeezes the groove bottom wall and deforms.

[0011] Optionally, the first bearing includes two dust covers, which are respectively covered at both ends of the bearing chamber of the first bearing; a second annular protrusion is provided on the rear surface of the bearing sealing ring, and the second annular protrusion squeezes one of the dust covers and deforms it.

[0012] Optionally, the first annular protrusion and the second annular protrusion are respectively located at the outer peripheral ends of the bearing sealing ring, and the two are symmetrically distributed.

[0013] Optionally, the second annular protrusion partially presses the bearing outer ring.

[0014] Optionally, the bearing sealing ring is interference fit with the drive shaft.

[0015] Optionally, the thickness of the bearing sealing ring is 1.5 mm-4 mm.

[0016] Optionally, the gear box includes a rear cover and a front shell, a cavity for accommodating the gear reduction mechanism is formed between the rear cover and the front shell, and the mounting groove is provided on the rear cover.

[0017] Optionally, a first sealing ring is provided at the assembly point of the rear cover and the front shell.

[0018] Optionally, the electric tool comprises an output shaft for driving a tool head to operate, the output shaft is inserted into the front shell, and a second sealing ring is provided at the assembly point of the output shaft and the front shell.

[0019] The utility model has the following technical effects:

[0020] The utility model provides an electric tool, wherein a bearing sealing ring is arranged between a first bearing and a mounting groove of a gear box, and through the sleeve connection relationship between the bearing sealing ring and the drive shaft, the lubricating oil in the gear box can be prevented from flowing along the drive shaft to the inner ring of the bearing, and a first annular protrusion is arranged on the bearing sealing ring to be in close contact with the bottom wall of the groove, so that the lubricating oil in the gear box can be prevented from flowing along the mounting groove to the outer ring of the bearing, and further, the lubricating oil in the gear box can be prevented from leaking through the bearing chamber of the first bearing and the assembly gap between the outer ring of the bearing and the mounting groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural cross-sectional view of the electric tool of the utility model;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0024] Figure 4 for Figure 1 Enlarged view of point C in the middle;

[0025] Figure 5 It is an exploded view of the assembly structure of the motor, the first bearing, the second bearing and the bearing sealing ring of the utility model;

[0026] Figure 6 It is a three-dimensional structural schematic diagram of the bearing sealing ring of the utility model.

[0027] Description of Reference Numerals

[0028] 100. Power tools;

[0029] 1. gear box; 11. rear cover; 111. mounting slot; 1111. slot bottom wall; 12. front shell; 13. cavity;

[0030] 2. Motor; 21. Drive shaft; 22. Stator; 23. Rotor;

[0031] 3. First bearing; 31. Bearing outer ring; 32. Bearing inner ring; 33. Dust cover; 34. Ball; 35. Bearing chamber;

[0032] 4. Bearing sealing ring; 41. First annular protrusion; 42. Second annular protrusion;

[0033] 5. The first sealing ring;

[0034] 6. Output shaft;

[0035] 7. Second sealing ring;

[0036] 8. Gear reduction mechanism;

[0037] 9. Second bearing. DETAILED DESCRIPTION

[0038] In order to make the technical solution and beneficial effects of the utility model more obvious and easy to understand, the following is a detailed description by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used in this article have the same meaning as those in the technical field to which this application belongs.

[0039] In the description of the present invention, unless otherwise explicitly defined, terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “height”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of simplified description of the present invention, and do not indicate that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation on the present invention.

[0040] In the present invention, the terms "first" and "second" are used only for the purpose of clear description and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly include at least one of the features. In the description of the present invention, "multiple" means at least two; "several" means at least one, unless otherwise clearly defined.

[0041] In the present invention, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0043] The "front" and "rear" mentioned in this utility model are all Figure 1 The markings in shall prevail.

[0044] According to the following Figures 1 to 6 The electric tool of the utility model is described in detail.

[0045] In this embodiment, if Figure 1 , Figure 2 and Figure 5As shown, the electric tool 100 includes a gear box 1, a motor 2, a first bearing 3, a bearing seal 4 and an output shaft 6. The motor 2 is located at the rear of the gear box 1. The motor 2 includes a drive shaft 21, a stator 22 and a rotor 23. The gear reduction mechanism 8 is located inside the gear box 1. One end of the output shaft 6 is located inside the gear box 1 and is transmitted and matched with the gear reduction mechanism 8 through the main shaft. The other end of the output shaft 6 extends out of the gear box 1 to be connected to a tool head (such as a drill bit or a screwdriver). The power of the motor 2 is transmitted to the gear reduction mechanism 8 through the drive shaft 21, and is transmitted to the output shaft 6 through the main shaft after being reduced in speed by the gear reduction mechanism 8, and finally drives the tool head to rotate through the output shaft 6.

[0046] like Figure 2 , Figure 5 and Figure 6 As shown, the first bearing 3 includes a bearing outer ring 31 and a bearing inner ring 32, a mounting groove 111 is formed on the rear end face of the gear box 1, the bearing outer ring 31 is mounted in the mounting groove 111, the bearing inner ring 32 is sleeved on the front part of the drive shaft 21, the front part of the drive shaft 21 is supported by the first bearing 3, the rear part of the drive shaft 21 is supported by the second bearing 9, the drive shaft 21 passes through the mounting groove 111 and is in transmission cooperation with the gear reduction mechanism 8. The bearing seal ring 4 is sleeved on the drive shaft 21, the first bearing 3 and the mounting groove 111 jointly clamp the bearing seal ring 4, the front surface of the bearing seal ring 4 is provided with a first annular protrusion 41, and the first annular protrusion 41 is closely attached to the groove bottom wall 1111 of the mounting groove 111.

[0047] By adopting the above technical solution, a bearing sealing ring 4 is arranged between the first bearing 3 and the mounting groove 111 of the gear box 1. Through the sleeve connection between the bearing sealing ring 4 and the drive shaft 21, the lubricating oil in the gear box 1 can be prevented from flowing along the drive shaft 21 to the bearing inner ring 32. In addition, by providing a first annular protrusion 41 on the bearing sealing ring 4 to fit tightly against the groove bottom wall 1111, the lubricating oil in the gear box 1 can be prevented from flowing along the mounting groove 111 to the bearing outer ring 31, thereby preventing the lubricating oil in the gear box 1 from leaking through the bearing chamber 35 of the first bearing 3 and the assembly gap between the bearing outer ring 31 and the mounting groove 111.

[0048] In one embodiment, the bearing sealing ring 4 is an elastic structure, for example, the bearing sealing ring 4 is a rubber ring, so that the first annular protrusion 41 squeezes the groove bottom wall 1111 and deforms, which can improve the sealing performance of the bearing sealing ring 4 on the assembly gap between the bearing outer ring 31 and the mounting groove 111.

[0049] Furthermore, if Figure 2 and Figure 5As shown, the first bearing 3 includes two dust covers 33 and a plurality of balls 34. The balls 34 are arranged in a bearing chamber 35 surrounded by a bearing outer ring 31 and a bearing inner ring 32. The two dust covers 33 are respectively arranged at both ends of the bearing chamber 35 of the first bearing 3 to prevent dust from entering the bearing chamber 35 and affecting the rolling performance of the balls 34. The rear surface of the bearing seal ring 4 is provided with a second annular protrusion 42. The second annular protrusion 42 squeezes the dust cover 33 located in front of the balls 34 and deforms. In this way, the deformation of the bearing seal ring 4 can be increased, so that the deformation is greater than 30%, and the sealing effect is better. In this way, the mounting groove 111 of the gear box 1, the drive shaft 21 and the first bearing 3 can be fully sealed through the bearing seal ring 4.

[0050] Furthermore, if Figure 2 and Figure 6 As shown, the first annular protrusion 41 and the second annular protrusion 42 are respectively located at the outer peripheral ends of the bearing sealing ring 4, and the first annular protrusion 41 and the second annular protrusion 42 are symmetrically distributed.

[0051] Furthermore, if Figure 2 As shown, the second annular protrusion 42 partially squeezes the bearing outer ring 31. On the one hand, the second annular protrusion 42 can seal the assembly gap between the dust cover 33 and the bearing outer ring 31. On the other hand, the bearing outer ring 31 can also withstand part of the extrusion force applied by the second annular protrusion 42, thereby preventing the dust cover 33 from being detached due to excessive extrusion pressure, which is not conducive to the sealing work of the bearing sealing ring 4.

[0052] In one embodiment, if Figure 2 As shown, the bearing seal ring 4 is interference fit with the drive shaft 21 to prevent the lubricating oil from flowing along the drive shaft 21 to the bearing inner ring 32 .

[0053] In one embodiment, the thickness of the bearing sealing ring 4 is 1.5mm-4mm. Compared with the skeleton oil seal, the bearing sealing ring 4 of this solution can be miniaturized in thickness. Compared with ordinary sealing rings, the bearing sealing ring 4 of this solution is a special-shaped sealing ring with better sealing effect.

[0054] In one embodiment, if Figure 1 and Figure 5 As shown, the gear box 1 includes a rear cover 11 and a front shell 12 , a cavity 13 for accommodating the gear reduction mechanism 8 is formed between the rear cover 11 and the front shell 12 , and a mounting groove 111 is provided on the rear cover 11 .

[0055] Furthermore, if Figure 1 and Figure 3 As shown, a first sealing ring 5 is provided at the assembly point of the rear cover 11 and the front shell 12 to prevent the lubricating oil in the cavity 13 from leaking from the assembly point of the rear cover 11 and the front shell 12 .

[0056] Furthermore, if Figure 1 and Figure 4 As shown, one end of the output shaft 6 is inserted into the front housing 12 , and a second sealing ring 7 is provided at the assembly point of the output shaft 6 and the front housing 12 to prevent the lubricating oil in the cavity 13 from leaking from the assembly point of the output shaft 6 and the front housing 12 .

[0057] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the utility model that may not be explicitly described. Therefore, the above embodiments only express several implementations of the utility model and do not limit the scope of protection of the utility model patent.

Claims

1. An electric tool, characterized in that: The electric tool (100) comprises: The gear box (1) has a mounting groove (111) formed on its rear end surface; A motor (2) located at the rear of the gearbox (1) and comprising a drive shaft (21); A first bearing (3), comprising a bearing outer ring (31) and a bearing inner ring (32), wherein the bearing outer ring (31) is installed in the installation groove (111), and the bearing inner ring (32) is sleeved on the drive shaft (21); A bearing sealing ring (4) is sleeved on the drive shaft (21), and the first bearing (3) and the mounting groove (111) jointly clamp the bearing sealing ring (4); a first annular protrusion (41) is provided on the front surface of the bearing sealing ring (4), and the first annular protrusion (41) is tightly attached to the bottom wall (1111) of the mounting groove (111).

2. The electric tool according to claim 1, characterized in that: The bearing sealing ring (4) is an elastic structure, and the first annular protrusion (41) squeezes the groove bottom wall (1111) and deforms.

3. The electric tool according to claim 2, characterized in that: The first bearing (3) comprises two dust covers (33), which are respectively arranged at two ends of a bearing chamber (35) of the first bearing (3); a second annular protrusion (42) is arranged on the rear surface of the bearing seal ring (4), and the second annular protrusion (42) squeezes one of the dust covers (33) and causes deformation.

4. The electric tool according to claim 3, characterized in that: The first annular protrusion (41) and the second annular protrusion (42) are respectively located at the outer peripheral ends of the bearing sealing ring (4), and the two are symmetrically distributed.

5. The electric tool according to claim 3, characterized in that: The second annular protrusion (42) partially presses the bearing outer ring (31).

6. The electric tool according to any one of claims 1 to 5, characterized in that: The bearing sealing ring (4) and the driving shaft (21) are interference fit.

7. The electric tool according to any one of claims 1 to 5, characterized in that: The thickness of the bearing sealing ring (4) is 1.5 mm-4 mm.

8. The electric tool according to any one of claims 2 to 5, characterized in that: The gear box (1) comprises a rear cover (11) and a front shell (12), a cavity (13) for accommodating a gear reduction mechanism is formed between the rear cover (11) and the front shell (12), and the mounting groove (111) is provided on the rear cover (11).

9. The electric tool according to claim 8, characterized in that: A first sealing ring (5) is provided at the assembly point of the rear cover (11) and the front shell (12).

10. The electric tool according to claim 8, characterized in that: The electric tool (100) comprises an output shaft (6) for driving a tool head to operate, the output shaft (6) is inserted into the front housing (12), and a second sealing ring (7) is provided at the assembly point between the output shaft (6) and the front housing (12).

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