CN112065970A - Angle grinder gear box sealing structure lubricated by lubricating oil and angle grinder - Google Patents

Abstract

The invention discloses a sealing structure of an angle grinder gear box lubricated by lubricating oil and an angle grinder, which comprise a shell, a transmission mechanism, a sealing assembly and liquid lubricating oil for lubrication, wherein the transmission mechanism comprises a motor shaft, a driving gear, a driven gear and a driving output shaft; the sealing assembly comprises an oil separation and pressure reduction ring and a sealing ring, a gap is formed between the oil separation and pressure reduction ring and the shaft for sealing, and the sealing ring and the shaft are in contact sealing. The invention provides the liquid lubricating oil for the first time in the gear box, the liquid lubricating oil can completely infiltrate and fully lubricate the meshed rotating gear pair, and the liquid lubricating oil can realize effective sealing in the working state and the static state of the angle grinder and can be matched with the sealing effect of the sealing component, thereby obviously prolonging the service life of the angle grinder.

Description

The sealing structure of the angle grinder gear box lubricated with lubricating oil and the angle grinder

technical field

The invention relates to the technical field of electric tools, in particular to a gear box and an angle grinder filled with liquid lubricating oil.

Background technique

An angle grinder is a power tool mainly used for cutting, grinding and polishing metal parts, stone and wood. The angle grinder is mainly driven by the motor through the gear mounted on the output shaft to drive the cutting disc or friction plate at the end of the output shaft. Therefore, angle grinders are generally provided with casing structures such as motor casings and gear boxes. The motor casing is used to accommodate the motor and its ancillary electrical components, and the gear box is used to accommodate the gear at the end of the motor shaft, the output shaft, the driven gear and its bearings for rotating support.

During the working process of the angle grinder, in order to increase the working life of the meshing gear pair and reduce the operating noise of the angle grinder, lubricant will be added to the gear box for lubrication. In order to prevent lubricant leakage and external dust from entering the gearbox, the input end of the gearbox and the motor shaft is designed with a relevant sealing structure or installed with relevant sealing parts; at the same time, for the convenience of installation, a gearbox cover or flange and output are designed. The shaft output end is sealed, or the corresponding sealing parts are installed in the gearbox cover or flange for sealing.

In the gear box of the angle grinder, the gear at the end of the motor shaft has a speed of 30,000 to 40,000 rpm or higher. Traditional angle grinders use semi-solid lubricating oil to lubricate bearings and gears, which are limited by the poor fluidity of semi-solid lubricating oil, so the traditional lubrication method has poor lubricating effect. Therefore, it is necessary to choose good lubricants, excellent sealing methods and sealing parts.

SUMMARY OF THE INVENTION

The present invention provides an angle grinder gear box filled with liquid lubricating oil, which can solve the above-mentioned defects in the prior art.

The technical scheme of the present invention is as follows:

An angle grinder gear box filled with liquid lubricating oil, the gear box includes a casing, a transmission mechanism and a sealing assembly; the casing has a first assembly hole and a second assembly hole; the transmission mechanism is assembled in the casing Inside the body, the transmission mechanism includes a motor shaft of a driving motor, a driving gear, a driven gear, and a driving output shaft. The motor shaft penetrates through the first assembly hole and is rotatably supported in the casing. The driving output shaft Passing through the second assembly hole and being rotatably supported in the casing; the driving gear is assembled on the end of the motor shaft, the driven gear is assembled on the drive output shaft, and the driving gear and the The driven gear is meshed and connected to form a rotating gear pair; the sealing assembly includes at least one oil-isolating decompression ring and at least one sealing ring, and the inner circumference of the oil-isolating decompression ring forms a predetermined clearance with the cylindrical surface of the shaft to achieve For the function of gap seal, the seal ring is in contact with the cylindrical surface of the shaft to achieve contact seal; wherein, the motor shaft and the drive output shaft are respectively provided with at least one set of the seal assemblies, through which the seal assemblies are The sealing of the connection between the shaft and the housing is realized, thereby reducing the leakage of the liquid lubricating oil and prolonging the bearing life.

The above-mentioned predetermined gap makes the oil separation pressure relief ring and the shaft not in contact, avoiding friction and wear, and at the same time, the predetermined gap prevents the liquid lubricating oil in the casing from flowing out of the predetermined gap, thereby preventing the liquid lubricating oil from flowing out. Leak, play a good sealing effect.

Aiming at the problem that the angle grinders in the global market currently use semi-solid grease for lubrication, and the semi-solid grease has poor lubricating effect, the present invention proposes for the first time to use liquid lubricating oil for lubrication. The liquid lubricating oil can fully infiltrate the meshing rotating gear pair, fully lubricate, and can achieve effective sealing in both the working state and the static state of the angle grinder to ensure the long-term lubrication of the rotating gear pair by the liquid lubricating oil. The structure is compact and reliable, and the double sealing form of cylindrical surface gap seal and contact seal is formed between the shaft and the housing by the sealing component, so that the service life of the angle grinder can be significantly extended as a whole.

By filling the gear box with liquid lubricating oil, the meshing gear pair is always in a state of infiltration of lubricating oil, and the meshing teeth can be covered with full oil film during the operation of the gears, which is continuously and fully lubricated. The transmission of frictional heat reduces the temperature of the tooth surface; the effective combination of the gap seal and the contact seal in the seal assembly ensures that the angle grinder using liquid lubricating oil does not leak oil during the entire use process, so that the gear pair will not leak. life more than doubled.

Preferably, the sealing components are respectively fixed in the first assembly hole and the second assembly hole in a non-rotatable manner.

Preferably, the shaft is disposed in a manner of penetrating the sealing assembly, and the gap between the oil separation and decompression ring and the shaft is set to 0.01-0.1mm, such as 0.09mm, 0.08mm, 0.07mm, 0.06mm, 0.05mm , 0.04mm, etc., the gap is preferably 0.02-0.03mm. A gap seal is formed between the oil separator and the shaft. If the gap is too small, it is technically difficult to achieve. If the gap is too large, it is easy to leak oil. Therefore, the setting of the gap between the oil separator and the shaft is very important. The essential.

Preferably, the transmission mechanism further includes a first bearing, the motor shaft is rotatably supported in the housing through the first bearing, the sealing assembly configured on the motor shaft is a first sealing assembly, the motor shaft, the The first bearing, the first seal assembly and the first assembly hole are coaxially arranged; the first seal assembly includes a first oil separation and decompression ring and a first seal ring, from the inside to the outside, the The first bearing, the first oil separation and decompression ring and the first sealing ring are sequentially fixed in the first assembly hole by interference fit. The oil separation and decompression ring is located between the bearing and the sealing ring, which is beneficial to reduce the pressure of the bearing on the sealing ring and improve the service life of the sealing ring.

Preferably, the transmission mechanism further includes a second bearing, the drive output shaft is rotatably supported in the housing through the second bearing, the seal assembly configured on the drive output shaft is a second seal assembly, and the drive output shaft is rotatably supported in the housing. The shaft, the second bearing, the second seal assembly and the second assembly hole are coaxially arranged; the second seal assembly includes a second oil separation and decompression ring and a second seal ring, extending from the inside to the In addition, the second bearing, the second oil separation and decompression ring, and the second sealing ring are sequentially fixed at the second assembly hole by interference fit.

Preferably, the oil separation and decompression ring is a dish-shaped structure, comprising an annular body and an outer ring perpendicular to the annular body in the circumferential direction, the oil separation decompression ring has the same outer diameter as the bearing, and the The outer ring of the oil separation decompression ring abuts against the bearing, so that an accommodation space for accommodating the liquid lubricating oil is formed between the oil separation decompression ring, the bearing and the cylindrical surface of the shaft. The oil separation pressure relief ring, the bearing end face and the motor shaft or the outer cylindrical surface of the drive output shaft together form an annular accommodation space. The annular accommodation space can accommodate the lubricating oil flowing to the oil separation pressure relief ring through the bearing to form an oil-containing space , the oil-containing space and the flow of lubricating oil in the inner space of the gear box can fully lubricate the bearing, reduce the heat generated during the rotation of the bearing, and effectively prolong the life of the bearing.

Preferably, the oil separation and decompression ring is integrally formed in the casing, or the oil separation decompression ring is made of metal material and then assembled to the casing.

Preferably, the space other than the transmission mechanism and the sealing assembly in the gear box is the remaining space, wherein the gear box is filled with liquid lubricating oil, and the liquid lubricating oil fills the remaining space. More than 50%, preferably 70%-98%, more preferably 80%-95%. It can fully infiltrate the meshing rotating gear pair, fully lubricate it, and cooperate with the sealing function of the sealing component to achieve effective sealing in both the working state and the static state of the angle grinder to ensure the long-term lubrication of the rotating gear pair with liquid lubricating oil.

Preferably, the sealing ring is at least one of a skeleton oil seal, an O-ring, an X-ring or a Y-ring.

The present invention also provides an angle grinder comprising an angle grinder gear box filled with liquid lubricating oil as described above.

Compared with the prior art, the beneficial effects of the present invention are as follows:

First, the present invention proposes the use of liquid lubricating oil in the angle grinder for the first time. The liquid lubricating oil can fully infiltrate the meshing rotating gear pair and lubricate fully; the structure of the sealing assembly is compact and reliable, and the oil separation and pressure reduction ring The effective combination of the two sealing forms of the gap seal and the contact seal of the sealing ring ensures that the angle grinder using liquid lubricating oil does not leak oil during the entire use process, so that the angle grinder can be effectively used in both working and stationary states. Sealed to ensure long-term lubrication of the rotating gear pair by liquid lubricating oil, so that the life of the gear pair is more than doubled.

Second, in the present invention, by filling the gear box with liquid lubricating oil, the meshing gear pair is always in a state of infiltration of lubricating oil, and the entire oil film covering the meshing teeth can be achieved during the operation of the gears, and the lubricating oil can accelerate the generation of the meshing teeth. The transmission of frictional heat and the reduction of the tooth surface temperature can not only prolong the working life of the transmission gear pair, but also reduce the operating noise of the angle grinder and the working temperature of the gear box.

Thirdly, the oil separation and decompression ring of the present invention has a dish-shaped structure. The annular accommodating space can accommodate the lubricating oil flowing through the bearing to the oil-separating pressure reducing ring, forming an oil-containing space. The oil-containing space and the flow of lubricating oil in the inner space of the gear box can fully lubricate the bearing and reduce the pressure on the bearing. The wear and heat during the rotation of the small bearing can effectively prolong the life of the bearing.

Fourth, the oil separation and decompression ring of the present invention is located between the bearing and the sealing ring, and the dish-shaped structure of the oil separation decompression ring is beneficial to reduce the pressure of the bearing on the sealing ring and improve the service life of the sealing ring.

Of course, it is not necessary for any product embodying the present invention to achieve all of the above-described advantages simultaneously.

Description of drawings

FIG. 1 is a schematic structural diagram of a gearbox according to Embodiment 1 of the present invention;

Fig. 2 is a partial structural schematic diagram of the connection between the shaft and the sealing assembly according to Embodiment 1 of the present invention;

3 is a schematic structural diagram of the sealing assembly according to Embodiment 1 of the present invention;

FIG. 4 is another structural schematic diagram of the gearbox according to Embodiment 1 of the present invention;

Fig. 5 is the sectional schematic diagram of the angle grinder of embodiment 2 of the present invention;

FIG. 6 is a schematic three-dimensional structure diagram of an angle grinder according to Embodiment 2 of the present invention.

Reference numerals: housing 100; oil separation pressure relief ring 101; sealing ring 102; flange 103; driving gear 104; main housing 105; drive output shaft 106; driven gear 107; end cover 108; third seal ring 109; first assembly hole 110a; second assembly hole 110b; motor shaft 111; drive motor 112; grinding head 114; auxiliary handle 116; third bearing 121; second bearing 122; first bearing 123; accommodating space 131 ; liquid lubricating oil 201; gap 301; first oil separation and decompression ring 101a; first sealing ring 102a; second oil separation decompression ring 101b; second sealing ring 102b; annular body 1011; part 1101; second step part 1102.

Detailed ways

In the description of the present invention, it should be noted that "inner" refers to the inside of the casing, and "outer" refers to the outside of the casing. The term "shaft" is the motor shaft or drive output shaft, and the term "bearing" is the first bearing or the second bearing.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", etc. is Based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood to limit the present invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As used in this specification, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.

The present invention will be further described below in conjunction with specific embodiments.

Example 1

This embodiment provides an angle grinder gear box filled with liquid lubricating oil. Referring to FIG. 1 to FIG. 4 , it is a schematic structural diagram of the gear box of this embodiment.

In this embodiment, the gearbox includes a casing 100 , a transmission mechanism assembled in the casing 100 , and a sealing assembly; the casing 100 has a first assembly hole 110 a and a second assembly hole 110 b , and the transmission mechanism includes a motor shaft for driving the motor 112 111. The driving gear 104, the driven gear 107, the drive output shaft 106, the motor shaft 111 penetrates the first assembly hole 110a and is rotatably supported in the housing 100, and the drive output shaft 106 passes through the second assembly hole 110b and is rotatably supported in the Inside the housing 100; the drive gear 104 is assembled on the end of the motor shaft 111, the driven gear 107 is assembled on the drive output shaft 106, the drive gear 104 is meshed with the driven gear 107 to form a rotating gear pair; the sealing assembly includes at least one oil separator The pressure reducing ring 101 and at least one sealing ring 102, the inner circumference of the oil separation pressure reducing ring 101 and the cylindrical surface of the shaft form a predetermined gap 301 to achieve the effect of gap sealing, and the sealing ring 102 is in contact with the cylindrical surface of the shaft to achieve Contact sealing; wherein, the motor shaft 111 and the drive output shaft 106 are respectively provided with at least one set of sealing components, and the sealing components are used to seal the connection between the shaft and the housing, thereby reducing the leakage of liquid lubricating oil and prolonging the bearing life.

In this embodiment, liquid lubricating oil is used for lubrication. The liquid lubricating oil can fully infiltrate the meshing rotating gear pair, and the meshing teeth can be covered with full oil film during the operation of the gears, which is continuously and fully lubricated. The transmission of friction heat can reduce the temperature of the tooth surface; the effective combination of the two sealing forms of the gap seal between the oil separation pressure relief ring and the cylindrical surface of the shaft and the contact seal of the seal ring in the seal assembly ensures the use of liquid lubricating oil for angle grinding. The machine does not leak oil during the entire use process, and can achieve effective sealing in both the working state and the static state of the angle grinder to ensure the long-term lubrication of the rotating gear pair by the liquid lubricating oil, so as to achieve a significant overall prolongation of the angle grinder. The service life of the gear pair is more than doubled.

In this embodiment, the housing 100 includes a main housing 105 and an end cover 108 , wherein the first mounting hole 110 a is provided on the main housing 105 , and the second mounting hole 110 b is provided on the end cover 108 . After the end cover 108 is assembled to the main casing 105, an accommodating cavity is formed for accommodating the above-mentioned transmission mechanism and sealing assembly, wherein the end cover 108 and the main casing 105 are fastened by screws, and at the connection stop The third sealing ring 109 is used for sealing, and the third sealing ring 109 is an O-ring.

Further, the transmission mechanism further includes a first bearing 122 , the first bearing 122 is fixed at the first assembly hole 110 a , and the motor shaft 111 is disposed through the first assembly hole 110 a and is rotatably supported by the first bearing 123 . A drive gear 104 is arranged at the end of the motor shaft 111 , and the drive gear 104 and the motor shaft 111 cannot move relative to each other during operation. The sealing assembly configured on the motor shaft 111 is the first sealing assembly, and the first sealing assembly realizes the sealing between the motor shaft 111 and the main casing 105 . The motor shaft 111 , the first bearing 123 , the first sealing component and the first assembly hole 110a are coaxially disposed; the first sealing component includes a first oil separation and decompression ring 101a and a first sealing ring 102a, wherein from the inside to the In addition, the first bearing 123 , the first oil separation and decompression ring 101a and the first sealing ring 102a are sequentially fixed in the first assembly hole 110a by interference fit.

The transmission mechanism further includes a second bearing 122 and a third bearing 121, the second bearing 122 is fixedly installed at the second assembly hole 110b, the third bearing 121 is fixedly installed in the main housing 105, and the driving output shaft 106 is disposed through the second At the mounting hole 110b, the drive output shaft 106 is rotatably supported by the third bearing 121 and the second bearing 122, respectively. The seal assembly disposed on the drive output shaft 106 is the second seal assembly, and the second seal assembly realizes sealing between the drive output shaft 106 and the end cover 108 . The drive output shaft 106 , the second bearing 122 , the second seal assembly and the second assembly hole 110b are coaxially disposed; the second seal assembly includes a second oil separation and decompression ring 101b and a second seal ring 102b, from the inside to the outside , the second bearing 122 , the second oil separation and decompression ring 101b and the second sealing ring 102b are sequentially fixed at the second assembly hole 110b with an interference fit. The driven gear 107 is arranged on the drive output shaft 106 , and the end of the drive output shaft 106 is arranged with a grinding head 114 for grinding.

Preferably, the shaft is disposed through the sealing assembly, and the gap 301 between the oil separation and decompression ring and the shaft is set to 0.01-0.04mm, preferably 0.02-0.03mm, as shown in FIG. 2 . A gap seal is formed between the oil separator and the shaft. If the gap is too small, it is technically difficult to achieve. If the gap is too large, it is easy to leak oil. Therefore, the setting of the gap between the oil separator and the shaft is very important. The essential. Wherein, the gap between the cylinder surface of the motor shaft 111 and the first oil isolation and decompression ring 101a is 0.02-0.03mm, and the gap between the cylinder surface of the drive output shaft 106 and the second oil isolation decompression ring 101b is 0.02-0.03mm .

The first gap seal, that is, the oil separation pressure reduction ring 101 and the motor shaft 111 or the drive output shaft 106 have a small gap 301 in the radial direction, and the "oil separation" purpose is achieved through the cooperation of the small gap 301. During the rotational movement of the motor shaft 111 and the drive output shaft 106, the oil separation and decompression ring 101 will not produce friction and wear, so the gap seal can play a good and consistent oil separation function throughout the use of the angle grinder. .

Referring to FIG. 3 , in the sealing assembly in this embodiment, the oil-separating and decompressing ring 101 has a dish-shaped structure, including an annular body 1011 and an outer ring 1012 perpendicular to the annular body 1011 in the circumferential direction. The oil-separating and decompressing ring 101 has the same Bearings with the same outer diameter, the outer ring 1012 of the oil separation decompression ring 101 abuts against the bearing, so that an accommodation space 131 for accommodating liquid lubricating oil is formed between the oil separation decompression ring 101 , the bearing end face and the cylindrical surface of the shaft. The oil separation decompression ring 101, the bearing end face and the motor shaft 111 or the outer cylindrical surface of the drive output shaft 106 together form an annular accommodating space 131, the annular accommodating space 131 can accommodate the lubricating oil flowing to the oil separation decompression ring through the bearing , forming an oil-containing space, the oil-containing space and the flow of lubricating oil in the inner space of the gear box can fully lubricate the bearing, reduce the heat generated during the rotation of the bearing, and effectively prolong the life of the bearing.

Preferably, the oil separation and decompression ring 101 is integrally formed in the housing 100 , and the integral molding has the advantage of a simple molding process. Or, the oil separation and decompression ring 101 is made of metal material and then assembled to the housing 100 . The oil separation pressure relief ring made of metal material has high strength and rigidity, and can effectively withstand the pressure difference during the operation of the gearbox, thereby playing a good "decompression" effect and reducing the contact seal mainly composed of rubber materials. The pressure difference between the inner and outer sides of the formed sealing ring improves the sealing performance and service life of the contact seal.

Preferably, the space other than the above-mentioned transmission mechanism and sealing components in the gear box is the remaining space, wherein the gear box is filled with liquid lubricating oil 201, and the liquid lubricating oil 201 fills 80%-95% of the remaining space. By filling up the liquid lubricating oil 201 in the gear box, the meshing gear pair is always in a state of infiltration of lubricating oil, and the meshing teeth can be covered with full oil film during the operation of the gear, and the continuous and sufficient lubrication can be achieved.

In this embodiment, the sealing ring 102 in the sealing assembly is at least one of a skeleton oil seal, an O-ring, an X-ring or a Y-ring. The second contact seal consists of two seal rings mainly composed of rubber materials to form contact seals with the outer cylindrical surfaces of the motor shaft 111 and the drive output shaft 106 respectively. Preferably, the sealing ring 102 is a skeleton oil seal.

In this embodiment, in order to facilitate processing and installation, the first oil separation and decompression ring 101a, the first sealing ring 102a and the first bearing 123 have the same outer diameter, and the second oil separation decompression ring 101b and the second bearing 122 have the same outer diameter. have the same size outer diameter. In this embodiment, referring to FIG. 1 and FIG. 4, at the first assembly hole 110a, the driving gear 104, the first bearing 123, the first oil separation and decompression ring 101a, and the first sealing ring 102a are arranged in sequence from the inside to the outside. The outer side of the first sealing ring 102a is fixed by a flange 103, and the flange 103 is fixed with the main casing 105 by screws, and axially restricts the movement of the first oil separation and decompression ring 101a and the first sealing ring 102a.

Referring to FIG. 4 , in this embodiment, the second assembly hole 110b includes a first step portion 1101 and a second step portion 1102, wherein the second sealing ring 102b is assembled at the first step portion 1101, and the second oil separation and decompression The ring 101b is assembled at the second step portion 1102, and the second bearing 122 is assembled inside the second oil separation and decompression ring 101b. An assembly groove is provided at a predetermined position in the main housing 105 , the third bearing 121 is fixed in the assembly groove, and one end of the drive output shaft 106 is rotatably supported by the third bearing 121 . .

In this embodiment, the sealing assembly adopts an oil separation pressure relief ring 101 and a sealing ring 102. Of course, in other optional embodiments, the number of oil separation pressure reduction rings 101 in the sealing assembly can be selected from 1, 2, 3 one or more, and the number of sealing rings 102 can also be 1, 2, 3 or more, and the number of oil separation and decompression rings 101 and sealing rings 102 in the sealing assembly can be set according to actual sealing requirements . Wherein, it is necessary to ensure that the outer sides of the first bearing 123 and the second bearing 122 are respectively press-fitted with an oil separation decompression ring 101 to form a gap seal. The quantities of the oil separation and decompression ring 101 and the sealing ring 102 are not used to limit the protection scope of the present invention, and will not be repeated here.

In this embodiment, the assembling process of the gear box of the angle grinder filled with liquid lubricating oil is as follows:

The third bearing 121 is pre-pressed in the main housing 105, the driving gear 104 is pre-installed in the main housing 105, and the first bearing 123, the first oil separation and decompression ring 101a, and the first sealing ring 102a are press-fitted in the first assembly In the hole 110a, the motor shaft 111 is assembled into the first assembly hole 110a, and a flange 103 is assembled outside the first assembly hole 110a to form a first assembly. The second sealing ring 102b, the second oil separation and decompression ring 101b, and the second bearing 122 are sequentially press-fitted into the second assembly hole 110b, and then the drive output shaft 106 is press-fitted into the second assembly hole 110b, and the driven gear 107 is then press-fitted into the second assembly hole 110b. It is press-fitted on the drive output shaft 106 and assembled into a second assembly, and then the second assembly and the first assembly are assembled to form the above-mentioned gearbox.

The liquid lubricating oil can be filled in the first assembly, or an oil injection hole is provided on the housing 100 , and after the gear box is assembled to form, the lubricating oil is filled through the provided oil injection hole.

Example 2

This embodiment provides an angle grinder filled with liquid lubricating oil. Refer to FIG. 5 and FIG. 6 for schematic structural diagrams of the angle grinder of this embodiment. Gear box, drive motor 112 and grinding head 114, the drive motor 112 is a drive motor, the drive motor can be a brush motor, or a brushless motor with electronic drive, the drive motor 112 is installed in the motor housing 113, The motor shaft 111 is rotatably supported within the main casing 105 . A grinding head 114 is fixed at the end of the drive output shaft 106 , and the grinding head 114 works for cutting or grinding tools such as cutting discs, friction discs, etc.

In this embodiment, an auxiliary handle 116 is configured on the angle grinder to facilitate holding during operation.

The above disclosures are merely preferred embodiments of the present invention. The preferred embodiments do not exhaust all the details, nor do they limit the invention to only the described embodiments. It should be understood that these embodiments are only used to illustrate the present invention, but not to limit the protection scope of the present invention. Improvements and adjustments made by those skilled in the art according to the present invention in practical applications still belong to the protection scope of the present invention.

Obviously, many modifications and variations are possible in light of the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (10)

1. A seal structure of a gear box of an angle grinder lubricated with lubricating oil, comprising:

the shell is provided with a first assembly hole and a second assembly hole, and liquid lubricating oil for lubrication is filled in the shell;

the transmission mechanism is assembled in the shell and comprises a motor shaft of a driving motor, a driving gear, a driven gear and a driving output shaft, the motor shaft penetrates through the first assembling hole and is rotatably supported in the shell, and the driving output shaft penetrates through the second assembling hole and is rotatably supported in the shell; the driving gear is assembled at the end part of the motor shaft, the driven gear is assembled at the driving output shaft, and the driving gear and the driven gear are meshed and connected to form a rotary gear pair;

the sealing assembly comprises at least one oil-separating pressure-reducing ring and at least one sealing ring, a preset gap is formed between the inner periphery of the oil-separating pressure-reducing ring and the cylindrical surface of the shaft to achieve the effect of gap sealing, and the sealing ring is in contact connection with the cylindrical surface of the shaft to realize contact sealing; wherein,

the motor shaft and the driving output shaft are respectively provided with at least one group of sealing assemblies, and the sealing assembly is used for sealing the joint of the shaft and the shell, so that the leakage of liquid lubricating oil is reduced, and the service life of the bearing is prolonged.

2. The lubrication oil lubricated angle mill gearbox seal structure according to claim 1, wherein said seal assembly is non-rotatably fixed within said first and second mounting holes, respectively.

3. The seal structure of a gearbox of an angle grinder lubricated with lubricating oil according to claim 1, wherein a shaft is provided through said seal assembly, and a gap between said oil-removing pressure-reducing ring and the shaft is set to 0.01-0.1 mm.

4. The seal structure of a gearbox of an angle grinder lubricated with lubricating oil according to claim 1, wherein said transmission mechanism further comprises a first bearing through which said motor shaft is rotatably supported in said housing, said motor shaft being provided with a first seal assembly, said motor shaft, said first bearing, said first seal assembly and said first fitting hole being coaxially disposed therebetween; the first sealing assembly comprises a first oil separation and pressure reduction ring and a first sealing ring, and the first bearing, the first oil separation and pressure reduction ring and the first sealing ring are sequentially fixed in the first assembling hole in an interference fit manner from inside to outside.

5. The seal structure of a gearbox of an angle grinder lubricated with lubricating oil according to claim 1, wherein said transmission mechanism further comprises a second bearing through which said drive output shaft is rotatably supported in said housing, said drive output shaft being provided with a seal assembly which is a second seal assembly, said drive output shaft, said second bearing, said second seal assembly and said second fitting hole being coaxially disposed therebetween; the second sealing assembly comprises a second oil-separating pressure-reducing ring and a second sealing ring, and the second bearing, the second oil-separating pressure-reducing ring and the second sealing ring are sequentially fixed at the second assembling hole in an interference fit manner from inside to outside.

6. The sealing structure of the angle mill gearbox lubricated by the lubricating oil according to claim 4 or 5, wherein the oil-separating pressure reducing ring is of a dish-shaped structure and comprises an annular body and an outer ring perpendicular to the annular body along the circumferential direction, the oil-separating pressure reducing ring has the same outer diameter as the bearing, and the outer ring of the oil-separating pressure reducing ring abuts against the bearing, so that an accommodating space for accommodating the liquid lubricating oil is formed among the oil-separating pressure reducing ring, the bearing and the cylindrical surface of the shaft.

7. The seal structure of a gearbox of an angle grinder lubricated with lubricating oil according to claim 1, wherein the oil-separating pressure-reducing ring is integrally formed with the housing, or is made of a metal material and is assembled to the housing.

8. The seal structure of a gearbox of a angle grinder lubricated with lubricating oil according to claim 1, wherein a space inside said housing excluding said transmission mechanism and said seal assembly is a surplus space, wherein said liquid lubricating oil fills more than 50% of said surplus space.

9. The seal structure of a gearbox of an angle grinder lubricated with lubricating oil according to claim 1, wherein the seal ring is at least one of a skeleton oil seal, an O-ring, an X-ring or a Y-ring.

10. An angle grinder comprising a sealing structure of a gear box of an angle grinder lubricated with a lubricating oil according to any one of claims 1 to 9.

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