Oil leakage prevention structure of angle grinder

Abstract

The utility model discloses an oil leakage prevention structure of an angle grinder, which comprises a casing for assembling a motor, a head casing and a transmission mechanism, the head casing is arranged at the front part of the casing, the transmission mechanism comprises a driving gear, a driven gear, an input shaft and an output shaft, and a gear cavity for accommodating the driving gear and the driven gear is arranged in the head casing. The head shell is provided with a first assembly hole communicated with the gear cavity and the interior of the machine shell, the input shaft penetrates through the first assembly hole and is rotationally supported on the head shell, the driving gear is assembled on the input shaft, the output shaft is rotationally arranged in the head shell, and the driven gear is assembled on the output shaft and meshed with the driving gear. One end of the output shaft extends out of the head shell and is used for being connected with a working head assembly, an oil blocking piece is fixed to the input shaft or the driving gear and comprises a spiral blade, the spiral blade is arranged in the first assembly hole and used for pushing back grease overflowing into the first assembly hole during rotation, and the phenomenon that the grease overflows from the first assembly hole can be reduced.

Description

Technical Field

[0001] The utility model relates to an angle grinder, in particular to an oil leakage prevention structure of the angle grinder. Background Art

[0002] Angle grinder, also known as angle grinder, is an electric tool mainly used for cutting, polishing and grinding metal components and stones. Different grinding wheels can be used for cutting, polishing or grinding according to processing requirements. It has the characteristics of small size, light weight, high work efficiency, easy to carry and use. It can not only greatly reduce the labor intensity of the operator, but also improve work efficiency. It is very popular among users and is widely used in all walks of life.

[0003] For example, patent CN203679989U discloses an improved angle grinder, which includes a motor, a casing, a head casing, a motor shaft, a small bevel gear, a large bevel gear, a gear box, an output shaft and a grinding wheel. The motor is installed in the casing, the small bevel gear and the large bevel gear are arranged in the gear box, the grinding wheel is arranged on the output shaft, the motor shaft of the motor passes through the assembly hole opened on the gear box and is connected with the small bevel gear in the gear box, the small bevel gear and the large bevel gear are engaged to drive the output shaft fixed to the large bevel gear to rotate, and then drive the grinding wheel to rotate.

[0004] For another example, patent CN212272990U discloses a split power transmission structure of an angle grinder, which includes a casing, a gear box is arranged at the front of the casing, a rotatable main shaft is vertically arranged in the gear box, the lower end of the main shaft extends out of the gear box and is connected with the grinding disc, a large gear is sleeved on the upper part of the main shaft, and a rotatable transmission shaft is also horizontally arranged in the gear box, the transmission shaft is located between the output end of the motor and the upper end of the main shaft, the transmission shaft is connected to the motor shaft of the motor, the transmission shaft passes through the assembly hole opened on the gear box and is connected with the pinion in the gear box, and a small gear is sleeved on the front part of the transmission shaft, and the small gear is vertically meshed with the large gear.

[0005] Grease is required to connect the gears used for transmission. When rotating, the grease may overflow from the gear cavity where the transmission gear set is installed through the assembly hole into the housing where the motor is installed, resulting in a lack of grease lubrication between the gears and a reduced service life. Utility Model Content

[0006] Based on the problem that the grease applied between the transmission gear sets in the gear cavity is easy to overflow from the assembly hole into the casing where the motor is installed during rotation, the utility model provides an anti-oil leakage structure of an angle grinder.

[0007] The technical solution adopted by the utility model to solve the above technical problems is: an anti-oil leakage structure of an angle grinder, comprising a casing for assembling a motor, a head casing and a transmission mechanism, the head casing is installed at the front part of the casing, the transmission mechanism comprises a driving gear, a driven gear, an input shaft and an output shaft, a gear cavity for accommodating the driving gear and the driven gear is provided in the head casing, a first assembly hole connecting the gear cavity and the inside of the casing is provided on the head casing, the input shaft passes through the first assembly hole and is rotatably supported on the head casing, the driving gear is assembled on the input shaft, the output shaft is rotatably arranged in the head casing, the driven gear is assembled on the output shaft and meshes with the driving gear, one end of the output shaft extends out of the head casing for connecting a working head assembly, an oil blocking member is fixed on the input shaft or the driving gear, the oil blocking member comprises a spiral blade, and the spiral blade is arranged in the first assembly hole for pushing back grease overflowing into the first assembly hole during rotation.

[0008] A further preferred technical solution of the utility model is: a gear shaft is fixed to the driving gear, the oil blocking member includes a sleeve, the spiral blades are arranged on the outer peripheral side wall of the sleeve, and the sleeve is sleeved on the gear shaft and fixed to the driving gear.

[0009] A further preferred technical solution of the utility model is that the spiral blades are arranged to extend along the axial direction of the input shaft.

[0010] A further preferred technical solution of the utility model is that the outer edge of the blade fits with the inner wall of the first assembly hole without contacting it.

[0011] A further preferred technical solution of the utility model is: the driving gear and the driven gear are both bevel gears, and the driving gear and the driven gear are vertically variable-direction transmission.

[0012] A further preferred technical solution of the utility model is: a notch for reflux of overflowing grease is provided at one end of the first assembly hole connected to the gear cavity, and the starting end of the spiral blade is opposite to the notch.

[0013] A further preferred technical solution of the utility model is: the blades extend from one end of the sleeve to the other end of the sleeve.

[0014] A further preferred technical solution of the utility model is: a step is provided between the driving gear and the gear shaft, and an end surface of one end of the sleeve sleeved on the gear shaft abuts against the step.

[0015] A further preferred technical solution of the utility model is: a bearing groove is opened on the head shell, the bearing groove is located at the end of the first assembly hole away from the gear cavity, a bearing is installed in the bearing groove, the input shaft passes through the center of the bearing and is rotatably supported by the bearing.

[0016] A further preferred technical solution of the utility model is: the head shell includes a main shell and an end cover, the first assembly hole is arranged on the main shell, the end cover is provided with a second assembly hole for the output shaft to extend out, and the gear cavity is formed after the end cover is assembled on the main shell.

[0017] Compared with the prior art, the advantage of the utility model is that an oil blocking member is fixed on the input shaft or the driving gear, and the oil blocking member includes a spiral blade, and the spiral blade is arranged in the first assembly hole. When rotating, the spiral blade can push the grease overflowing from the gear cavity into the first assembly hole back into the gear cavity, so as to reduce the loss of grease in the gear cavity and ensure the lubrication of grease between the gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the overall structure of the angle grinder;

[0020] Figure 2 This is a disassembled diagram of the casing and head shell;

[0021] Figure 3 This is a disassembled diagram of the housing, head housing and motor;

[0022] Figure 4 It is a cross-sectional schematic diagram of the motor and the head shell;

[0023] Figure 5 It is a structural schematic diagram of the head shell;

[0024] Figure 6 It is a schematic cross-sectional view of the head shell;

[0025] Figure 7 It is a structural schematic diagram of the oil blocking component;

[0026] Figure 8 It is a partial cross-sectional view of the interior of the head shell;

[0027] Fig. 9 Schematic diagram of the main shell structure.

[0028] In the figure: 1. casing; 2. head casing; 3. working head assembly; 4. driving gear; 5. input shaft; 6. oil blocking member; 7. first bearing; 8. motor; 9. main casing; 10. end cover; 11. output shaft; 12. second assembly hole; 13. second bearing groove; 14. second bearing; 15. driven gear; 16. gear cavity; 17. first assembly hole; 18. first bearing groove; 19. sleeve; 20. blade; 21. gear shaft; 22. notch. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0030] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0031] Figure 1-Figure 9 As shown, the angle grinder comprises a housing 1 , a head housing 2 , a motor 8 , a transmission mechanism and a working head assembly 3 . The head housing 2 is mounted at the front of the housing 1 , and the motor 8 is mounted inside the housing 1 .

[0032] Preferably, the head shell 2 is fixedly connected to the front of the casing 1 by bolts, and the front of the casing 1 has an opening.

[0033] Figure 3-Figure 6 As shown, the transmission mechanism includes a driving gear 4, a driven gear 15, an input shaft 5 and an output shaft 11. A gear cavity 16 for accommodating the driving gear 4 and the driven gear 15 is provided in the head shell 2. The driving gear 4 and the driven gear 15 are arranged in the gear cavity 16. A first assembly hole 17 connecting the gear cavity 16 and the inside of the casing 1 is provided on the head shell 2. The input shaft 5 passes through the first assembly hole 17 and is rotatably supported on the head shell 2. The driving gear 4 is assembled on the input shaft 5. The output shaft 11 is rotatably arranged in the head shell 2. The driven gear 15 is assembled on the output shaft 11 and meshes with the driving gear 4. One end of the output shaft 11 extends out of the head shell 2 for connecting the working head assembly 3.

[0034] The working head assembly 3, such as a grinding wheel, is used to grind the surface of an object.

[0035] Figure 1 , Figure 2 As shown, preferably, the head shell 2 includes a main shell 9 and an end cover 10, a first assembly hole 17 is provided on the main shell 9, a second assembly hole 12 for the output shaft 11 to extend is provided on the end cover 10, and the end cover 10 is assembled on the main shell 9 to form a gear chamber 16. The end cover 10 is fixedly connected to the main shell 9 by bolts.

[0036] Preferably, a second bearing groove 13 is provided on the inner side of the end cover 10, the second assembly hole 12 falls on the bottom of the second bearing groove 13, a second bearing 14 is installed in the second bearing groove 13, the output shaft 11 passes through the center of the second bearing 14, and the second bearing 14 supports the output shaft 11.

[0037] Preferably, a first bearing groove 18 is provided on the side of the main shell 9 facing the casing 1. The first bearing groove 18 is located at an end of the first assembly hole 17 away from the gear cavity 16. The first assembly hole 17 falls on the bottom of the first bearing groove 18. A first bearing 7 is installed in the first bearing groove 18. The input shaft 5 passes through the center of the first bearing 7. The first bearing 7 provides rotational support for the input shaft 5 passing through.

[0038] The driving gear 4 and the driven gear 15 can be cylindrical gears. When the driving gear 4 and the driven gear 15 are cylindrical gears, the input shaft 5 and the output shaft 11 are parallel and drive in the same direction. Figure 4 , Figure 6 As shown, for example, in this patent, preferably, the driving gear 4 and the driven gear 15 are both bevel gears, the driving gear 4 and the driven gear 15 are vertically variable transmission, the driving gear 4 is sleeved on the input shaft 5 and fixed to the input shaft 5, and the driven gear 15 is sleeved on the output shaft 11 and fixed to the output shaft 11, and at this time the input shaft 5 and the output shaft 11 are perpendicular to each other.

[0039] The input shaft 5 may be a transmission shaft connected to the motor shaft of the motor 8. Preferably, as in this patent, the motor shaft of the motor 8 passes through the first assembly hole 17 as the input shaft 5 and is connected to the driving gear 4.

[0040] Figure 6-Figure 9 As shown, an oil blocking member 6 is fixed on the input shaft 5 or the driving gear 4. The oil blocking member 6 includes a spiral blade 20. The spiral blade 20 is arranged in the first assembly hole 17 to push back the grease overflowing into the first assembly hole 17 during rotation.

[0041] When the motor 8 is started, the motor shaft of the motor 8 drives the spiral blades 20 and the driving gear 4 to rotate, the driving gear 4 drives the driven gear 15 to rotate, and the output shaft 11 rotates coaxially with the driven gear 15, so that the working head assembly 3 fixed on the output shaft 11 rotates to perform the grinding operation. During the rotation of the input shaft 5, the spiral blades 20 rotate to push the grease overflowing from the gear cavity 16 into the first assembly hole 17 back to the gear cavity 16, so as to reduce the loss of grease in the gear cavity 16 and ensure the lubrication of grease between the gears.

[0042] The spiral blade 20 may be a part of the input shaft 5 and formed integrally with the input shaft 5 ; or the spiral blade 20 may be a part of the driving gear 4 and formed integrally with the driving gear 4 ; or the oil blocking member 6 may be a component sleeved on the input shaft 5 .

[0043] Or, for example, in this patent, preferably, the oil blocking member 6 is a member sleeved on the driving gear 4. Specifically, a gear shaft 21 is fixed to the driving gear 4, and the oil blocking member 6 includes a sleeve 19, and a spiral blade 20 is arranged on the outer peripheral side wall of the sleeve 19, and the sleeve 19 is sleeved on the gear shaft 21 and fixed to the driving gear 4. The sleeve 19 is tightly matched with the gear shaft 21.

[0044] Preferably, a step is provided between the driving gear 4 and the gear shaft 21 , and an end surface of one end of the sleeve 19 sleeved on the gear shaft 21 abuts against the step.

[0045] Preferably, the spiral blades 20 extend from one end of the sleeve 19 to the other end of the sleeve 19 .

[0046] Preferably, the spiral blades 20 are arranged to extend along the axial direction of the input shaft 5 .

[0047] Preferably, the outer edge of the spiral blade 20 fits with the inner wall of the first assembly hole 17 without contacting it, so as to achieve the effect of pushing the grease overflowing into the first assembly hole 17 back into the gear cavity 16 to the greatest extent.

[0048] Preferably, a notch 22 is provided at one end of the first assembly hole 17 connected to the gear cavity 16 for the backflow of overflowed grease, and the starting end of the spiral blade 20 is opposite to the notch 22 to ensure that the grease pushed back by the spiral blade 20 can flow back into the gear cavity 16.

[0049] The other parts of the angle grinder are the same as those of the existing angle grinders, such as internal electronic components, control switches, etc.

[0050] The above is an introduction to the oil leakage prevention structure of the angle grinder provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An anti-leakage structure of an angle grinder, comprising a casing for assembling a motor, a head casing and a transmission mechanism, the head casing being mounted at the front of the casing, the transmission mechanism comprising a driving gear, a driven gear, an input shaft and an output shaft, a gear cavity for accommodating the driving gear and the driven gear is provided in the head casing, a first assembly hole connecting the gear cavity and the inside of the casing is provided on the head casing, the input shaft passes through the first assembly hole and is rotatably supported on the head casing, the driving gear is assembled on the input shaft, the output shaft is rotatably arranged in the head casing, the driven gear is assembled on the output shaft and meshes with the driving gear, one end of the output shaft extends out of the head casing for connecting a working head assembly, characterized in that: An oil-blocking member is fixed on the input shaft or the driving gear. The oil-blocking member includes a spiral blade. The spiral blade is arranged in the first assembly hole and is used to push back the grease overflowing into the first assembly hole during rotation.

2. The oil leakage prevention structure of the angle grinder according to claim 1, characterized in that: A gear shaft is fixed to the driving gear, and the oil blocking member comprises a sleeve, and spiral blades are arranged on the outer peripheral side wall of the sleeve. The sleeve is sleeved on the gear shaft and fixed to the driving gear.

3. The oil leakage prevention structure of the angle grinder according to claim 1 or 2, characterized in that: The spiral blades are arranged to extend along the axial direction of the input shaft.

4. The oil leakage prevention structure of the angle grinder according to claim 1 or 2, characterized in that: The outer edge of the blade fits with the inner wall of the first assembly hole without contacting it.

5. The oil leakage prevention structure of the angle grinder according to claim 1, characterized in that: The driving gear and the driven gear are both bevel gears, and the driving gear and the driven gear are vertically variable in direction.

6. The oil leakage prevention structure of the angle grinder according to claim 1, characterized in that: One end of the first assembly hole connected to the gear cavity is provided with a notch for the overflowed grease to flow back, and the starting end of the spiral blade is opposite to the notch.

7. The oil leakage prevention structure of the angle grinder according to claim 2, characterized in that: The blades extend from one end of the sleeve to the other end of the sleeve.

8. The oil leakage prevention structure of the angle grinder according to claim 2, characterized in that: A step is arranged between the driving gear and the gear shaft, and an end surface of one end of a sleeve sleeved on the gear shaft abuts against the step.

9. The oil leakage prevention structure of the angle grinder according to claim 1, characterized in that: The head shell is provided with a bearing groove, which is located at an end of the first assembly hole away from the gear cavity. A bearing is installed in the bearing groove, and the input shaft passes through the center of the bearing and is rotatably supported by the bearing.

10. The oil leakage prevention structure of the angle grinder according to claim 1, characterized in that: The head shell comprises a main shell and an end cover, a first assembly hole is arranged on the main shell, a second assembly hole for the output shaft to extend is arranged on the end cover, and the gear cavity is formed after the end cover is assembled on the main shell.

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