Angle grinder

Abstract

The utility model discloses an angle grinder. The angle grinder comprises a first shell; the second shell is mounted on the first shell, and an accommodating cavity is defined by the second shell and the first shell; the check ring is fixedly installed on the second shell and located in the containing cavity; the first end of the output shaft is rotationally installed on the first shell, and the second end of the output shaft penetrates through the second shell. The bevel gear is arranged on the output shaft in a sleeving mode, and a movable groove is formed among the bevel gear, the check ring and the output shaft; the lock pin is arranged in the movable groove; in the first state, the bevel gear and the output shaft are locked, and the lock pin is movably arranged in the movable groove; in the second state, the bevel gear and the output shaft are unlocked, the lock pin is limited in the movable groove, and the lock pin abuts against the output shaft and the check ring. According to the angle grinder, the grinding piece can be directly detached and replaced through an external tool, time and labor are saved, and operation is convenient.

Description

Technical Field

[0001] This application belongs to the technical field of power tools, and particularly relates to an angle grinder. Background Art

[0002] An angle grinder is a portable power tool used for cutting and grinding. It uses grinding discs such as high-speed rotating thin grinding wheels, rubber grinding wheels, and wire wheels to grind, cut, remove rust, and polish workpieces to be processed.

[0003] After the angle grinder is used for a long time, the grinding disc on the angle grinder will wear. To avoid the deterioration of the processing effect of the angle grinder, the operator needs to regularly replace the grinding disc. The existing replacement method is mainly to press the locking pin on the outer shell of the angle grinder by hand to lock the bevel gear sleeved on the output shaft, and then use external tools such as a wrench to disassemble and replace the grinding disc. This replacement method is time-consuming and laborious, greatly affecting the normal progress of work.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of this application 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

[0005] The purpose of this application is to provide an angle grinder that can disassemble and replace the grinding disc in a time-saving and labor-saving manner, with convenient and simple operation.

[0006] To achieve the above purpose, the technical solution provided by a specific embodiment of this application is as follows:

[0007] An angle grinder, comprising:

[0008] A first housing;

[0009] A second housing, installed on the first housing and enclosing a receiving cavity with the first housing;

[0010] A retaining ring, fixedly installed on the second housing and located in the receiving cavity;

[0011] An output shaft, the first end of the output shaft is rotatably installed on the first housing, and the second end of the output shaft penetrates through the second housing;

[0012] A bevel gear, sleeved on the output shaft, and an activity groove is formed among the bevel gear, the retaining ring, and the output shaft;

[0013] A locking pin, arranged in the activity groove;

[0014] In the first state, the bevel gear is locked with the output shaft, and the locking pin is movably arranged in the activity groove;

[0015] In the second state, the bevel gear is unlocked from the output shaft, the locking pin is limited in the movable slot, and the locking pin abuts against both the output shaft and the retaining ring.

[0016] In one or more embodiments of the present application, the bevel gear includes a main body portion and a plurality of extending portions. The main body portion is sleeved on the output shaft, and the locking pin is located between two adjacent extending portions.

[0017] In one or more embodiments of the present application, the main body portion is provided with a mounting hole, the output shaft is installed through the mounting hole, the mounting hole is provided with a first abutting surface, and the output shaft is provided with a second abutting surface. In the first state, the first abutting surface abuts against the second abutting surface, and in the second state, the first abutting surface is separated from the second abutting surface.

[0018] In one or more embodiments of the present application, the second abutting surface is provided with a first locking position and a second locking position. The locking pin can move between the first locking position and the second locking position. In the first state, the locking pin is separated from both the first locking position and the second locking position, and in the second state, the locking pin abuts against the first locking position or the second locking position.

[0019] In one or more embodiments of the present application, the first abutting surface and / or the second abutting surface is one or a combination of a plane and a curved surface.

[0020] In one or more embodiments of the present application, in the first state, the locking pin abuts against the extending portion.

[0021] In one or more embodiments of the present application, one of the inner wall of the second housing and the outer wall of the retaining ring is provided with a mounting groove, and the other is provided with a mounting protrusion.

[0022] In one or more embodiments of the present application, the output shaft includes a first mounting portion installed with the first housing, an assembly portion installed through the bevel gear, a second mounting portion protruding from the second housing, and a connecting portion connecting the assembly portion and the second mounting portion. The locking pin is at least partially disposed between the assembly portion and the retaining ring.

[0023] In one or more embodiments of the present application, the angle grinder further includes a bearing sleeved on the connecting portion and located in the second housing, and the outer ring of the bearing abuts against the retaining ring.

[0024] In one or more embodiments of the present application, the angle grinder further includes a pressing plate installed on the second housing. The pressing plate is sleeved on the connecting portion and abuts against the inner ring of the bearing.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The present application provides an angle grinder, which can directly disassemble and replace the grinding disc through an external tool, saving time and effort and being convenient to operate; at the same time, by arranging the locking pin on the bevel gear, it is possible to avoid opening holes on the first housing to install the locking pin, saving costs and preventing the leakage of lubricating oil in the receiving cavity to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application 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 application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 is an exploded structural schematic diagram of the angle grinder in an embodiment of the present application;

[0029] Figure 2 is a sectional structural schematic diagram of the angle grinder in an embodiment of the present application;

[0030] Figure 3 is Figure 1 a sectional structural schematic diagram of A-A in the first state in ;

[0031] Figure 4 is Figure 3 an enlarged partial structural view of A in ;

[0032] Figure 5 is Figure 1 a sectional structural schematic diagram of B-B in the first state in ;

[0033] Figure 6 is Figure 5 an enlarged partial structural view of B in ;

[0034] Figure 7 is Figure 1 a sectional structural schematic diagram of A-A in the second state in ;

[0035] Figure 8 is Figure 7 an enlarged partial structural view of C in ;

[0036] Figure 9 is Figure 1 a sectional structural schematic diagram of B-B in the second state in ;

[0037] Figure 10 is Figure 9 an enlarged partial structural view of D in .

[0038] Description of Main Reference Numerals:

[0039] 11. First housing; 12. Second housing; 121. Mounting groove; 13. Receiving cavity;

[0040] 2. Retaining ring; 21. Mounting bump;

[0041] 3. Output shaft; 31. First mounting portion; 32. Assembly portion; 321. Second abutting surface; 3211. First locking position; 3212. Second locking position; 33. Second mounting portion; 34. Connecting portion;

[0042] 4. Bevel gear; 41. Main body portion; 411. Mounting hole; 4111. First abutting surface; 412. Tooth portion; 42. Extension portion;

[0043] 5. Activity groove;

[0044] 6. Lock pin;

[0045] 7. Bearing; 71. Outer ring; 72. Inner ring; 73. Ball;

[0046] 8. Pressure plate. Detailed Implementation Manner

[0047] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0049] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0050] The technical solutions in this application will be described below in conjunction with the accompanying drawings.

[0051] Referring to Figures 1 to 10 As shown, the angle grinder in this embodiment includes: a first housing 11, a second housing 12, a retaining ring 2, an output shaft 3, a bevel gear 4, and a lock pin 6.

[0052] Wherein, the second housing 12 is installed on the first housing 11 and encloses a receiving cavity 13 with the first housing 11; the retaining ring 2 is fixedly installed on the second housing 12 and is located in the receiving cavity 13; the first end of the output shaft 3 is rotatably installed on the first housing 11, and the second end of the output shaft 3 penetrates through the second housing 12; the bevel gear 4 is sleeved on the output shaft 3, and an activity groove 5 is formed among the bevel gear 4, the retaining ring 2, and the output shaft 3; the locking pin 6 is arranged in the activity groove 5; in the first state, the bevel gear 4 is locked with the output shaft 3, and the locking pin 6 is movably arranged in the activity groove 5; in the second state, the bevel gear 4 is unlocked from the output shaft 3, the locking pin 6 is limited in the activity groove 5, and the locking pin 6 abuts against both the output shaft 3 and the retaining ring 2. It should be noted that a motor is arranged in the angle grinder, the transmission shaft of the motor extends into the first housing 11, a transmission wheel is installed on the transmission shaft, and the transmission wheel meshes with the bevel gear 4, so as to transmit the rotation of the motor to the bevel gear 4. In addition, lubricating oil can be filled in the receiving cavity 13 to reduce wear during the meshing process of the transmission wheel and the bevel gear 4.

[0053] When the motor rotates, the angle grinder is in the first state, the power of the motor is transmitted to the bevel gear 4 through the transmission wheel, and the bevel gear 4 rotates axially around the output shaft 3 until the bevel gear 4 is locked with the output shaft 3. At this time, the locking pin 6 slides relatively on the outer surface of the output shaft 3 and does not abut against the inner wall of the retaining ring 2. Therefore, the locking pin 6 will not block the rotation of the output shaft 3, so as to drive the output shaft 3 to rotate by starting the motor and realize the processing of the workpiece to be processed.

[0054] When the grinding disc is disassembled and replaced by an external tool, the output shaft 3 may rotate. During the rotation of the output shaft 3, since other structures inside the receiving cavity 13 do not move, the locking pin 6 slides relatively on the outer surface of the output shaft 3 and abuts against the inner wall of the retaining ring 2, so that the output shaft 3 is locked and the operator cannot rotate the output shaft 3 any further.

[0055] Compared with the traditional angle grinder, the angle grinder in the present application can directly disassemble and replace the grinding disc by an external tool, which is time-saving, labor-saving and convenient to operate; at the same time, by arranging the locking pin 6 on the bevel gear 4, it is possible to avoid opening holes on the first housing 11 to install the locking pin 6, saving costs and preventing the leakage of lubricating oil in the receiving cavity 13 to a certain extent.

[0056] Specifically, referring to Figure 1 、 Figure 2As shown, the bevel gear 4 in this embodiment includes a main body portion 41 and a plurality of extending portions 42. The extending portions 42 are circumferentially spaced apart on the surface of the main body portion 41 away from the first housing 11. The main body portion 41 is sleeved on the output shaft 3 so that the entire bevel gear 4 is sleeved on the output shaft 3. The locking pin 6 is disposed in the movable groove 5 and located between two adjacent extending portions 42. Among them, a tooth portion 412 is provided on the surface of the main body portion 41 facing the first housing 11 for meshing with the transmission wheel on the motor side.

[0057] For the convenience of installing the output shaft 3, refer to Figure 1 、 Figure 2 As shown, an installation hole 411 is provided on the main body portion 41 in this embodiment, and the output shaft 3 is inserted through and installed in the installation hole 411. Among them, a first abutting surface 4111 is provided on the installation hole 411, and a second abutting surface 321 is provided on the output shaft 3. The first abutting surface 4111 and the second abutting surface 321 are correspondingly arranged. Refer to Figure 3 、 Figure 4 、 Figure 7 、 Figure 8 As shown, in the first state, the first abutting surface 4111 abuts against the second abutting surface 321, so that the bevel gear 4 abuts against the output shaft 3 and is locked; in the second state, the first abutting surface 4111 is separated from the second abutting surface 321, so that the bevel gear 4 is separated from the output shaft 3 and unlocked. In a preferred solution, in the second state, the first abutting surface 4111 and the second abutting surface 321 are arranged substantially parallel. Among them, the number of the first abutting surfaces 4111 is the same as the number of the second abutting surfaces 321, and the number of the second abutting surfaces 321 is the same as the number of the locking pins 6.

[0058] During the process of replacing the grinding disc with an external tool, the operator may rotate the output shaft 3 clockwise or counterclockwise. Therefore, in order to enable the operator to lock the output shaft 3 from the outside when using either of the two rotation directions, refer to Figure 5 、 Figure 6 、 Figure 9 、 Figure 10 As shown, a first locking position 3211 and a second locking position 3212 are provided on the second abutting surface 321 in this embodiment. The locking pin 6 can move between the first locking position 3211 and the second locking position 3212. In the first state, the locking pin 6 is separated from both the first locking position 3211 and the second locking position 3212, and the motor can drive the output shaft 3 to rotate; in the second state, the locking pin 6 abuts against the first locking position 3211 or the second locking position 3212, and the operator cannot rotate the output shaft 3, so as to facilitate the disassembly and replacement of the grinding disc.

[0059] Optionally, refer to Figure 4 、 Figure 8As shown, the first abutting surface 4111 and the second abutting surface 321 in this embodiment are correspondingly arranged, wherein both the first abutting surface 4111 and the second abutting surface 321 are flat surfaces. Of course, the present application is not limited to this, and the first abutting surface 4111 and the second abutting surface 321 can also be curved surfaces, or a combination of flat surfaces and curved surfaces. Compared with other solutions, the design where both the first abutting surface 4111 and the second abutting surface 321 are flat surfaces is more convenient for processing and production and reduces costs.

[0060] It should be noted that during the process of the motor driving the output shaft 3 to rotate, it is the motor that first drives the transmission wheel to rotate, then drives the bevel gear 4 to rotate via the transmission wheel, and finally drives the output shaft 3 to rotate via the bevel gear 4. Therefore, referring to Figure 5 、 Figure 6 、 Figure 9 、 Figure 10 As shown, in the first state, during the rotation of the bevel gear 4, the extending portion 42 also rotates along the axis direction of the output shaft 3, and the locking pin 6 abuts against the extending portion 42. When the bevel gear 4 drives the output shaft 3 to rotate together, it will not be affected by the locking pin 6.

[0061] Referring to Figure 1 、 Figure 2 As shown, the output shaft 3 in this embodiment includes a first mounting portion 31 mounted to the first housing 11, an assembly portion 32 penetrating and mounted in the bevel gear 4, a second mounting portion 33 protruding from the second housing 12, and a connecting portion 34 connecting the assembly portion 32 and the second mounting portion 33. The locking pin 6 is at least partially disposed between the assembly portion 32 and the retaining ring 2. Among them, the second abutting surface 321 is circumferentially spaced on the assembly portion 32. The grinding disc is detachably mounted on the second mounting portion 33. In order to facilitate the installation of the grinding disc, external threads can be provided on the second mounting portion 33.

[0062] In order to facilitate the installation of the structure inside the receiving cavity 13 and prevent the internal structure of the receiving cavity 13 from being worn during the rotation of the output shaft 3, referring to Figure 1 、 Figure 2 As shown, the angle grinder in this embodiment further includes a bearing 7 sleeved on the connecting portion 34 and located in the second housing 12. The bearing 7 includes an outer ring 71, an inner ring 72, and balls 73 located between the outer ring 71 and the inner ring 72. Among them, the upper surface of the outer ring 71 of the bearing 7 abuts against the lower surface of the retaining ring 2, the outer side wall of the outer ring 71 of the bearing 7 abuts against the inner side wall of the second housing 12, and the inner side wall of the inner ring 72 of the bearing 7 abuts against the outer side wall of the connecting portion 34.

[0063] Preferably, in order to facilitate the installation of the bearing 7 and prevent the bearing 7 from falling off from the receiving cavity 13, referring to Figure 1 、 Figure 2As shown, the angle grinder in this embodiment further includes a pressing plate 8 mounted on the second housing 12. The pressing plate 8 is sleeved on the connecting portion 34 and abuts against the inner ring 72 of the bearing 7. The pressing plate 8 can rotate with the rotation of the output shaft 3.

[0064] In order to install the retaining ring 2 in the second housing 12 and prevent the retaining ring 2 from rotating in the second housing 12, refer to Figure 1 、 Figure 5 As shown, an installation groove 121 is provided on the inner wall of the second housing 12 in this embodiment, and an installation protrusion 21 that cooperates with the installation groove 121 is provided on the outer wall of the retaining ring 2. In other embodiments, an installation protrusion is provided on the inner wall of the second housing 12, and an installation groove that cooperates with the installation protrusion is provided on the outer wall of the retaining ring 2, which are all within the protection scope of this application.

[0065] From the above technical solutions, it can be seen that this application has the following beneficial effects:

[0066] This application provides an angle grinder that can directly disassemble and replace the grinding disc through an external tool, which is time-saving, labor-saving and convenient to operate; at the same time, by arranging the locking pin on the bevel gear, it is possible to avoid opening holes on the first housing to install the locking pin, saving costs and preventing the leakage of lubricating oil in the receiving cavity to a certain extent.

[0067] For those skilled in the art, it is obvious that this application is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of this application, this application can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of this application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in this application. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0068] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An angle grinder, characterized in that: The angle grinder comprises: A first housing (11); A second shell (12) is mounted on the first shell (11) and encloses the first shell (11) to form a receiving cavity (13); A retaining ring (2) is fixedly mounted on the second shell (12) and is located in the receiving cavity (13); an output shaft (3), wherein a first end of the output shaft (3) is rotatably mounted on the first housing (11), and a second end of the output shaft (3) passes through the second housing (12); A bevel gear (4) is sleeved on the output shaft (3), and a movable groove (5) is formed between the bevel gear (4), the retaining ring (2), and the output shaft (3); A locking pin (6) is arranged in the movable groove (5); In the first state, the bevel gear (4) and the output shaft (3) are locked, and the locking pin (6) is movably disposed in the movable groove (5); In the second state, the bevel gear (4) and the output shaft (3) are unlocked, the locking pin (6) is limited in the movable groove (5), and the locking pin (6) is in contact with both the output shaft (3) and the retaining ring (2).

2. The angle grinder according to claim 1, characterized in that: The bevel gear (4) comprises a main body (41) and a plurality of extensions (42); the main body (41) is sleeved on the output shaft (3); and the locking pin (6) is located between two adjacent extensions (42).

3. The angle grinder according to claim 2, characterized in that: The main body (41) is provided with a mounting hole (411), the output shaft (3) is installed through the mounting hole (411), the mounting hole (411) is provided with a first abutting surface (4111), and the output shaft (3) is provided with a second abutting surface (321). In a first state, the first abutting surface (4111) abuts against the second abutting surface (321), and in a second state, the first abutting surface (4111) is separated from the second abutting surface (321).

4. The angle grinder according to claim 3, characterized in that: The second abutting surface (321) is provided with a first locking position (3211) and a second locking position (3212), and the locking pin (6) can move between the first locking position (3211) and the second locking position (3212). In a first state, the locking pin (6) is separated from the first locking position (3211) and the second locking position (3212); in a second state, the locking pin (6) abuts against the first locking position (3211) or the second locking position (3212).

5. The angle grinder according to claim 3, characterized in that: The first abutting surface (4111) and / or the second abutting surface (321) is a plane, a curved surface, or a combination of the two.

6. The angle grinder according to claim 2, characterized in that: In the first state, the locking pin (6) abuts against the extending portion (42).

7. The angle grinder according to claim 1, characterized in that: One of the inner wall of the second shell (12) and the outer wall of the retaining ring (2) is provided with a mounting groove (121), and the other is provided with a mounting protrusion (21) matching with the mounting groove (121).

8. The angle grinder according to claim 1, characterized in that: The output shaft (3) comprises a first mounting portion (31) mounted on the first housing (11), an assembly portion (32) penetrating and mounted in the bevel gear (4), a second mounting portion (33) protruding from the second housing (12), and a connecting portion (34) connecting the assembly portion (32) and the second mounting portion (33), and the locking pin (6) is at least partially arranged between the assembly portion (32) and the retaining ring (2).

9. The angle grinder according to claim 8, characterized in that: The angle grinder further comprises a bearing (7) sleeved on the connecting portion (34) and located in the second housing (12), and an outer ring (71) of the bearing (7) abuts against a retaining ring (2).

10. The angle grinder according to claim 9, characterized in that: The angle grinder further comprises a pressure plate (8) mounted on the second housing (12); the pressure plate (8) is sleeved on the connecting portion (34) and abuts against the inner ring (72) of the bearing (7).

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