Bevel gear and angle grinder

Abstract

The utility model discloses a bevel gear and an angle grinder. The top face of the bevel gear is provided with a concave part and tooth parts distributed on the outer portion of the concave part at intervals in the circumferential direction, a tooth groove is formed between every two adjacent tooth parts, a shaft hole is formed in the concave part in the axial direction in a penetrating mode, a first boss is arranged on the concave part, and the shaft hole penetrates through the first boss; a plurality of oil storage grooves are formed between the first boss and the tooth part and communicate with the tooth grooves. According to the angle grinder, through the arrangement of the oil storage tank, an oil storage space is provided for grease, a transmission part is conveniently lubricated when the angle grinder works, and the service life of the bevel gear is prolonged; meanwhile, compared with an existing bevel gear, the bevel gear is lighter in weight, lower in mechanical loss and higher in working efficiency; in addition, the oil storage tank can also play a role of a tool withdrawal groove in the tooth part machining process, and machining of the bevel gear is facilitated.

Description

Technical Field

[0001] The present application belongs to the technical field of electric tools, and in particular relates to a bevel gear and an angle grinder. Background Art

[0002] The transmission part of the existing angle grinder is generally composed of a pair of bevel gears, which include a large bevel gear arranged on one side of the transmission shaft of the motor and a small bevel gear arranged on one side of the output shaft of the angle grinder.

[0003] Since the small bevel gear located on one side of the output shaft of the angle grinder is not provided with an auxiliary lubrication structure, grease cannot be stored on the top surface of the small bevel gear. Therefore, if the transmission part is to be lubricated, the small bevel gear and the large bevel gear can only be meshed with each other, so that the grease in the gear box is brought to the meshing point for lubrication. However, the above lubrication method has great limitations, which are specifically reflected in the following two aspects: on the one hand, the grease that can be used in the gear box is limited to the grease near the small bevel gear, and the grease in other places cannot play a lubricating role, which easily causes grease waste; on the other hand, since there is less grease available for lubrication, not only the lubrication effect is poor, but also the service life of the bevel gear is easily shortened.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The purpose of the present application is to provide a bevel gear and an angle grinder, which can lubricate the transmission part, improve the lubrication effect, increase the service life of the bevel gear, and avoid grease waste.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the present application is as follows:

[0007] A bevel gear, wherein the top surface of the bevel gear is provided with a recessed portion and teeth portions distributed on the outside of the recessed portion at intervals along the circumferential direction, a tooth groove is provided between two adjacent teeth portions, an axial hole is axially penetrated through the recessed portion, a first boss is provided on the recessed portion, the axial hole penetrates the first boss, a plurality of oil storage grooves are formed between the first boss and the teeth portion, and the oil storage grooves are communicated with the tooth grooves.

[0008] In one or more embodiments of the present application, one end of the tooth groove facing the oil storage tank is higher than the bottom surface of the oil storage tank.

[0009] In one or more embodiments of the present application, a height difference between an end of the tooth groove facing the oil storage tank and a bottom surface of the oil storage tank is greater than or equal to 1 mm.

[0010] In one or more embodiments of the present application, the recessed portion is provided with a plurality of shaft locking holes spaced apart along the circumference of the shaft hole, the recessed portion is provided with a plurality of second bosses, and the shaft locking holes penetrate through the second bosses.

[0011] In one or more embodiments of the present application, at least one of the second bosses is connected to the first boss; and / or,

[0012] At least one of the second bosses is connected to the tooth groove; and / or,

[0013] The top surface of the second boss is flush with the top surface of the first boss.

[0014] In one or more embodiments of the present application, the tooth groove is a straight groove, a curved groove, or a combination of the two.

[0015] In one or more embodiments of the present application, the bottom area of ​​the oil storage tank is 10% to 90% of the bottom area of ​​the recessed portion.

[0016] In one or more embodiments of the present application, the bevel gear further includes a retaining rib disposed in the oil storage tank.

[0017] In one or more embodiments of the present application, the retaining ribs are in a grid shape or an arc shape.

[0018] Another specific embodiment of the present application provides a technical solution as follows:

[0019] An angle grinder comprises the bevel gear as described above.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] The present application provides an oil storage space for grease by setting up an oil storage tank, which is convenient for lubricating the transmission part when the angle grinder is working, thereby extending the service life of the bevel gear and the angle grinder; at the same time, compared with the existing bevel gears and angle grinders, the bevel gears and angle grinders in the present application are lighter, have lower mechanical losses, and have higher working efficiency; in addition, the oil storage tank in the present application can also play the role of a tool retraction groove during the processing of the tooth portion, thereby facilitating the processing of the bevel gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the bevel gear in the first embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the top view of the bevel gear in the first embodiment of the present application;

[0025] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0026] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure at the middle BB;

[0027] Figure 5 This is an enlarged view of the local structure of the angle grinder in Example 2 of the present application.

[0028] Description of main reference numerals:

[0029] 1. Recessed portion; 10. Small bevel gear; 11. Shaft hole; 12. First boss; 13. Shaft locking hole; 14. Second boss;

[0030] 21. tooth portion; 22. tooth groove;

[0031] 3. Oil storage tank;

[0032] 4. Resistant tendons;

[0033] 5. Large bevel gear;

[0034] 6. Gearbox. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0038] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0039] Embodiment 1:

[0040] Reference Figure 1 to Figure 4 As shown, the top surface of the bevel gear in this embodiment is provided with a recessed portion 1 and teeth 21 distributed on the outside of the recessed portion 1 at intervals along the circumferential direction, a tooth groove 22 is provided between two adjacent teeth 21, an axial hole 11 is provided through the recessed portion 1 in the axial direction, a first boss 12 is provided on the recessed portion 1, the axial hole 11 passes through the first boss 12, a plurality of oil storage grooves 3 are formed between the first boss 12 and the teeth 21, and the oil storage grooves 3 are connected to the tooth grooves 22. It should be noted that the oil storage grooves 3 in this embodiment can be processed by forging or milling.

[0041] By setting up the oil storage tank 3, an oil storage space is provided for grease, which is convenient for lubricating the transmission part when the angle grinder is working, thereby extending the service life of the bevel gear; at the same time, compared with the existing bevel gear, the bevel gear in this embodiment is lighter, has lower mechanical loss, and higher working efficiency; in addition, the oil storage tank 3 in this embodiment can also play the role of a tool withdrawal groove during the process of machining the tooth portion 21, thereby facilitating the machining of the bevel gear.

[0042] Reference Figure 3 As shown, the design of the first boss 12 can prevent grease from flowing out of the oil storage tank 3 from the shaft hole 11. In order to facilitate processing, the connection between the first boss 12 and the oil storage tank 3 in this embodiment can be a right angle transition. Of course, in other embodiments, the connection between the first boss 12 and the oil storage tank 3 can also be an arc transition, or an obtuse angle transition, or other shapes.

[0043] Reference Figure 1 , Figure 2 As shown, the tooth groove 22 in this embodiment is a curved groove in the shape of an arc. In other embodiments, the tooth groove 22 can also be a straight groove, or a special-shaped groove composed of a straight groove and a curved groove.

[0044] In order to store grease conveniently and prevent grease from flowing out of the oil storage tank 3 directly from the tooth groove 22, refer to Figure 3 As shown, in this embodiment, one end of the tooth groove 22 facing the oil storage tank 3 is higher than the bottom surface of the oil storage tank 3 .

[0045] Specifically, refer to Figure 3 As shown, the height difference between the end of the tooth groove 22 facing the oil storage tank 3 and the bottom surface of the oil storage tank 3 in this embodiment is greater than or equal to 1mm. Exemplarily, the height difference between the end of the tooth groove 22 facing the oil storage tank 3 and the bottom surface of the oil storage tank 3 is 2mm, that is, the height of the maximum oil storage volume in the oil storage tank 3 is about 2mm. Of course, the present application is not limited to this, and the height difference between the end of the tooth groove 22 facing the oil storage tank 3 and the bottom surface of the oil storage tank 3 in other embodiments can also be 1mm, or 3mm, or any height value greater than 1mm and not 2mm.

[0046] It is understandable that, referring to Figure 3 , Figure 4 As shown, the top surface of the first boss 12 is higher than the bottom surface of the oil storage tank 3. In the preferred embodiment, the height difference between the top surface of the first boss 12 and the bottom surface of the oil storage tank 3 is also greater than or equal to 1mm. Of course, in other embodiments, under the premise that the top surface of the first boss 12 is higher than the bottom surface of the oil storage tank 3, the height difference between the top surface of the first boss 12 and the bottom surface of the oil storage tank 3 is 0mm to 1mm, which can also prevent grease from flowing out of the oil storage tank 3 from the shaft hole 11. The second protrusion 14 (described below) is similar and will not be repeated here.

[0047] The recessed portion 1 in this embodiment is provided with a plurality of shaft locking holes 13 spaced apart along the circumference of the shaft hole 11, and a plurality of second bosses 14 are provided on the recessed portion 1. The shaft locking holes 13 penetrate through the second bosses 14. Through the design of the shaft locking holes 13, the bevel gear can be stopped urgently during actual use to ensure the stability of the structure. Figure 2 As shown, illustratively, there are two shaft locking holes 13 in this embodiment and they are symmetrically arranged on both sides of the shaft hole 11, and there are also two second bosses 14, and each shaft locking hole 13 passes through the corresponding second boss 14. Of course, the present application is not limited to this, and the shaft locking holes 13 in other embodiments can be 3, or 4, or more than 4. Compared with the solution of setting more than 2 shaft locking holes 13, under the premise of ensuring structural stability, when the shaft locking holes 13 are set to 2, the processing is most convenient and quick, and the processing cost is also the lowest.

[0048] Since the oil storage tank 3 in the present application can be processed by forging or milling, after the oil storage tank 3 is processed, the first boss 12 and the second boss 14 can be naturally formed. Figure 3 , Figure 4 As shown, in this embodiment, the top surface of the second boss 14 is flush with the top surface of the first boss 12. Of course, if the heights of the first boss 12 and the second boss 14 are inconsistent, it is also within the protection scope of the present application.

[0049] Reference Figure 2 As shown, the second boss 14 in this embodiment is not only connected to the first boss 12, but also connected to the tooth groove 22. That is, when there are two locking shaft holes 13 and two second bosses 14, an oil storage tank 3 is respectively provided on both sides of the first boss 12 and the second boss 14, which can not only ensure the storage capacity of grease storage, but also facilitate the uniform lubrication of different areas of the bevel gear during actual working. It can be understood that when the number of second bosses 14 is set more, the number of oil storage tanks 3 formed between the first boss 12, the second boss 14, and the tooth portion 21 is also more, which can facilitate more uniform lubrication of the bevel gear.

[0050] In other embodiments, the second boss 14 may not be connected to the first boss 12 or communicated with the tooth groove 22 ; or, the second boss 14 may neither be connected to the first boss 12 nor communicated with the tooth groove 22 .

[0051] In order to ensure that the oil storage tank 3 stores enough grease, refer to Figure 2 , Figure 3 As shown, the bottom area of ​​the oil storage tank 3 in this embodiment is 10% to 90% of the bottom area of ​​the recessed portion 1. For example, the bottom area of ​​the oil storage tank 3 is 20% of the bottom area of ​​the recessed portion 1. Of course, the present application is not limited thereto, and in other embodiments, the bottom area of ​​the oil storage tank 3 may be 10%, or 90%, or any percentage value in the range of 10% to 90% and not 20% of the bottom area of ​​the recessed portion 1.

[0052] In order to prevent the grease in the oil storage tank 3 from flowing into the tooth groove 22 too quickly, refer to Figure 1 to Figure 3 As shown, the bevel gear in this embodiment further includes a resisting rib 4 disposed in the oil storage tank 3. The resisting rib 4 may be in an arc shape. In other embodiments, the resisting rib 4 may also be in a grid shape.

[0053] Embodiment 2:

[0054] Reference Figure 2 As shown, the angle grinder in this embodiment includes the bevel gear as shown in the first embodiment, which is a small bevel gear 10. The small bevel gear 10 is located on one side of the output shaft and meshes with the large bevel gear 5 located on the motor side. The transmission part composed of the large bevel gear 5 and the small bevel gear 10 is located inside the gear box 6. Through the design of the bevel gear, the transmission part can be fully lubricated, the lubrication effect is improved, and the service life of the angle grinder is increased.

[0055] It can be seen from the above technical solutions that the present application has the following beneficial effects:

[0056] The present application provides an oil storage space for grease by setting up an oil storage tank, which is convenient for lubricating the transmission part when the angle grinder is working, thereby extending the service life of the bevel gear and the angle grinder; at the same time, compared with the existing bevel gears and angle grinders, the bevel gears and angle grinders in the present application are lighter, have lower mechanical losses, and have higher working efficiency; in addition, the oil storage tank in the present application can also play the role of a tool retraction groove during the processing of the tooth portion, thereby facilitating the processing of the bevel gear.

[0057] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present application 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 application. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0058] 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. A bevel gear, characterized in that: The top surface of the bevel gear is provided with a recessed portion (1) and teeth (21) distributed at intervals along the circumferential direction on the outside of the recessed portion (1); a tooth groove (22) is provided between two adjacent teeth (21); an axial hole (11) is axially penetrated on the recessed portion (1); a first boss (12) is provided on the recessed portion (1); the axial hole (11) penetrates the first boss (12); a plurality of oil storage grooves (3) are formed between the first boss (12) and the teeth (21); the oil storage grooves (3) are communicated with the tooth grooves (22).

2. The bevel gear according to claim 1, characterized in that: One end of the tooth groove (22) facing the oil storage tank (3) is higher than the bottom surface of the oil storage tank (3).

3. The bevel gear according to claim 2, characterized in that: The height difference between one end of the tooth groove (22) facing the oil storage tank (3) and the bottom surface of the oil storage tank (3) is greater than or equal to 1 mm.

4. The bevel gear according to claim 1, characterized in that: The recessed portion (1) is provided with a plurality of shaft locking holes (13) spaced apart along the circumference of the shaft hole (11), and the recessed portion (1) is provided with a plurality of second bosses (14), and the shaft locking holes (13) penetrate through the second bosses (14).

5. The bevel gear according to claim 4, characterized in that: At least one of the second bosses (14) is connected to the first boss (12); and / or, At least one of the second bosses (14) is connected to the tooth groove (22); and / or, The top surface of the second boss (14) is arranged flush with the top surface of the first boss (12).

6. The bevel gear according to claim 1, characterized in that: The tooth groove (22) is a straight groove, a curved groove, or a combination of the two.

7. The bevel gear according to claim 1, characterized in that: The bottom area of ​​the oil storage tank (3) is 10% to 90% of the bottom area of ​​the recessed portion (1).

8. The bevel gear according to claim 1, characterized in that: The bevel gear also includes a resisting rib (4) arranged in the oil storage tank (3).

9. The bevel gear according to claim 8, characterized in that: The retaining ribs (4) are in a grid shape or an arc shape.

10. An angle grinder, characterized in that: The angle grinder comprises the bevel gear according to any one of claims 1 to 9.

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