CN212959800U - Angle grinder gear box sealing structure lubricated by lubricating oil and angle grinder - Google Patents

Abstract

The utility model discloses a use lubricated angle mill gear box's of lubricating oil seal structure and angle mill, including casing, drive mechanism, seal assembly, the liquid lubricating oil that is used for lubricating, drive mechanism includes motor shaft, driving gear, driven gear, drive output shaft, and motor shaft, drive output shaft rotate to be supported in the casing, and the driving gear assembles in the tip of motor shaft, and driven gear assembles in drive output shaft, and the driving gear meshes with driven gear and is connected the formation rotatory gear pair; 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 utility model discloses use liquid lubricating oil in the gear box, this liquid lubricating oil can carry out whole soaks to the rotatory gear pair of meshing, and is fully lubricated to can all realize effectively sealedly at angle mill operating condition and quiescent condition, and cooperate seal assembly's sealed effect, thereby can show the life who prolongs the angle mill.

Description

Angle grinder gear box sealing structure lubricated by lubricating oil and angle grinder

Technical Field

The utility model relates to an electric tool technical field, in particular to pack has gear box and angle mill of liquid lubricating oil.

Background

An angle grinder is an electric tool which is mainly used for cutting, grinding and polishing metal parts, stone and wood. The angle grinder mainly works by driving a cutting plate or a friction plate at the end part of an output shaft by a motor through driving a gear arranged on the output shaft. The angle grinder is therefore generally provided with a housing structure such as a motor housing, a gear housing and the like. The motor casing is used for accommodating the motor and the accessory electric parts thereof, and the gear box is used for accommodating the end gear of the motor shaft, the output shaft, the driven gear and the bearing for rotating and supporting the driven gear.

In the working process of the angle grinder, in order to prolong the service life of the meshing gear pair and reduce the running noise of the angle grinder, a lubricant is added into the gear box for lubrication. In order to prevent the lubricant from leaking and external dust from entering the gear box, the input ends of the gear box and the motor shaft are designed with related sealing structures or are provided with related sealing parts; meanwhile, in order to facilitate installation, a gearbox cover or a flange is designed to be sealed with the output end of the output shaft, or corresponding sealing parts are installed in the gearbox cover or the flange to be sealed.

In a gear box of the angle grinder, a gear at the end part of a motor shaft has the rotating speed of 30000-40000 rpm or higher. The traditional angle grinder adopts semi-solid lubricating oil to lubricate a bearing and a gear, and is limited by poor fluidity of the semi-solid lubricating oil, so that the traditional lubricating mode has poor lubricating effect. Therefore, it is necessary to select a good lubricant, an excellent sealing method, and a sealing part.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fill has angle mill gear box of liquid lubricating oil, can solve the above-mentioned defect among the prior art.

The technical scheme of the utility model as follows:

an angle grinder gearbox filled with liquid lubricating oil, the gearbox comprising a housing, a transmission mechanism and a seal assembly; the shell is provided with a first assembly hole and a second assembly hole; 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 achieve contact sealing; 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.

The preset gap prevents the oil-separating pressure reducing ring from contacting the shaft, so that friction and abrasion are avoided, and simultaneously the liquid lubricating oil in the shell cannot flow out of the preset gap, so that the leakage of the liquid lubricating oil is prevented, and a good sealing effect is achieved.

To the angle mill in the present global market all use semisolid lubricating grease to lubricate, the poor problem of lubricated effect of semisolid lubricating grease, the utility model discloses propose for the first time to use liquid lubricating oil to lubricate. This liquid lubricating oil can carry out whole infiltration to the rotatory gear pair of meshing, and fully lubricate to can all realize effectively sealing in order to guarantee the long-time lubrication of liquid lubricating oil rotatory gear pair at angle mill operating condition and quiescent condition, this seal assembly structure is compact reliable, forms the sealed and contact sealed dual seal form of cylinder clearance through seal assembly counter shaft and casing, thereby can realize showing the life who prolongs the angle mill totally.

The gear box is filled with liquid lubricating oil, so that the meshing gear pair is always in a lubricating oil infiltration state, full oil film coverage on meshing teeth can be realized in the gear running process, continuous and sufficient lubrication can be realized, meanwhile, the lubricating oil can accelerate the transmission of friction heat generated by the meshing teeth, and the temperature of the tooth surface is reduced; the effective combination of two sealing forms of clearance sealing and contact sealing in the matching sealing assembly ensures that the angle grinder using liquid lubricating oil does not leak oil in the whole using process, so that the service life of the gear pair is prolonged by more than one time.

Preferably, the sealing assembly is non-rotatably fixed in the first assembly hole and the second assembly hole respectively.

Preferably, the shaft is arranged in a manner penetrating through the sealing assembly, and the gap between the oil-separating and pressure-reducing ring and the shaft is 0.01-0.1mm, such as 0.09mm, 0.08mm, 0.07mm, 0.06mm, 0.05mm, 0.04mm and the like, and the gap is preferably 0.02-0.03 mm. The oil separation pressure reducing ring and the shaft form a gap seal, if the gap is too small, the technical realization is difficult, and if the gap is too large, oil leakage is easy, so the arrangement of the gap between the oil separation pressure reducing ring and the shaft is critical.

Preferably, the transmission mechanism further includes a first bearing, the motor shaft is rotatably supported in the housing through the first bearing, a sealing assembly configured on the motor shaft is a first sealing assembly, and the motor shaft, the first bearing, the first sealing assembly and the first assembling hole are coaxially disposed; 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. The oil-separating pressure-reducing ring is positioned between the bearing and the sealing ring, so that the pressure of the bearing on the sealing ring is favorably reduced, and the service life of the sealing ring is prolonged.

Preferably, the transmission mechanism further includes a second bearing, the driving output shaft is rotatably supported in the housing through the second bearing, a sealing assembly configured on the driving output shaft is a second sealing assembly, and the driving output shaft, the second bearing, the second sealing assembly and the second assembling hole are coaxially arranged; 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.

Preferably, the oil removal pressure reducing ring is a dish-shaped structure and comprises an annular body and an outer ring perpendicular to the annular body along the circumferential direction, the oil removal pressure reducing ring has the same outer diameter as the bearing, and the outer ring of the oil removal pressure reducing ring abuts against the bearing, so that an accommodating space for accommodating liquid lubricating oil is formed among the cylindrical surfaces of the oil removal pressure reducing ring, the bearing and the shaft. The oil removal pressure reducing ring and the bearing end face and the outer cylindrical surface of the motor shaft or the drive output shaft jointly enclose an annular accommodating space, the annular accommodating space can accommodate lubricating oil flowing to the oil removal pressure reducing ring through the bearing, an oil containing space is formed, the bearing can be fully lubricated by the flowing of the lubricating oil in the oil containing space and the inner space of the gear box, the heating in the rotating process of the bearing is reduced, and the service life of the bearing is effectively prolonged.

Preferably, the oil-separating pressure-reducing ring is integrally formed with the housing, or the oil-separating pressure-reducing ring is made of a metal material and then assembled to the housing.

Preferably, a space in the gear box excluding the transmission mechanism and the seal assembly is a remaining space, wherein the gear box is filled with liquid lubricating oil, and the liquid lubricating oil fills more than 50%, preferably 70% to 98%, and more preferably 80% to 95% of the remaining space. Can carry out whole infiltration to the rotating gear pair of meshing, fully lubricate, cooperation seal assembly's sealing action can all realize effectively sealing in angle mill operating condition and quiescent condition in order to guarantee the long-time lubrication of liquid lubricating oil rotating gear pair.

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

The utility model discloses still provide one kind contain as above arbitrary the angle mill that is filled with the angle mill gear box of liquid lubricating oil.

Compared with the prior art, the beneficial effects of the utility model are as follows:

firstly, the utility model firstly proposes to use the liquid lubricating oil in the angle grinder, and the liquid lubricating oil can completely infiltrate and fully lubricate the meshed rotating gear pair; the structure of the sealing component is compact and reliable, and the effective combination of two sealing forms of gap sealing of the oil separation and pressure reduction ring and contact sealing of the sealing ring ensures that the angle grinder using liquid lubricating oil does not leak oil in the whole using process, so that the working state and the static state of the angle grinder can realize effective sealing to ensure that the liquid lubricating oil lubricates the rotary gear pair for a long time, and the service life of the gear pair is prolonged by more than one time.

Second, the utility model discloses an add full liquid lubricating oil in the gear box, make the vice infiltration state that is in lubricating oil all the time of meshing gear, can realize the full oil film of meshing tooth at gear operation in-process and cover, the transmission of the frictional heat that the meshing tooth produced can be accelerated to lubricating oil, reduces flank of tooth temperature, not only can prolong the vice life of transmission gear, can also reduce the operating temperature of angle mill running noise and gear box.

Third, the utility model discloses an oil removal pressure reducing ring is the dish shape structure, and the bearing is supported to oil removal pressure reducing ring's outer lane, and oil removal pressure reducing ring encloses into annular accommodation space with bearing end face and motor shaft or drive output shaft's cylinder jointly, and this annular accommodation space can hold the lubricating oil through bearing flow direction oil removal pressure reducing ring, forms an oil-containing space, and the flow of lubricating oil can carry out fully lubricated to the bearing in this oil-containing space and the gear box inner space, reduces the wearing and tearing of the rotatory in-process of bearing and generates heat, effectively prolongs the bearing life-span.

Fourth, the utility model discloses an oil removal pressure reducing ring is located between bearing and the sealing washer to and the ware shape structure of oil removal pressure reducing ring is favorable to reducing the pressure of bearing to the sealing washer, improves the life of sealing washer.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

Fig. 1 is a schematic structural view of a gear box according to embodiment 1 of the present invention;

fig. 2 is a partial structural schematic view of a connection part of a shaft and a sealing assembly in embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a seal assembly according to embodiment 1 of the present invention;

fig. 4 is another schematic structural view of a gear box according to embodiment 1 of the present invention;

FIG. 5 is a schematic cross-sectional view of an angle grinder according to embodiment 2 of the present invention;

fig. 6 is a schematic perspective view of an angle grinder according to embodiment 2 of the present invention.

Reference numerals: a housing 100; an oil-removal pressure-reduction ring 101; a seal ring 102; a flange plate 103; a drive gear 104; a main housing 105; a drive output shaft 106; a driven gear 107; an end cap 108; a third seal ring 109; a first fitting hole 110 a; a second fitting hole 110 b; a motor shaft 111; a drive motor 112; a grinding head 114; an auxiliary handle 116; a third bearing 121; a second bearing 122; a first bearing 123; an accommodating space 131; liquid lubricating oil 201; a gap 301; a first oil removal pressure reducing ring 101 a; a first seal ring 102 a; a second oil-removal pressure-reduction ring 101 b; a second seal ring 102 b; an annular body 1011; an outer ring 1012; a first step 1101; second step 1102.

Detailed Description

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

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

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 with reference to the following specific examples.

Example 1

The embodiment provides a gear box of an angle grinder filled with liquid lubricating oil, and the gear box is a structural schematic diagram of the gear box of the embodiment with reference to fig. 1-4.

In this embodiment, the gearbox includes a housing 100, a transmission mechanism fitted within the housing 100, and a seal assembly; the housing 100 has a first assembly hole 110a and a second assembly hole 110b, the transmission mechanism includes a motor shaft 111 of a driving motor 112, a driving gear 104, a driven gear 107, and a driving output shaft 106, the motor shaft 111 penetrates through the first assembly hole 110a and is rotatably supported in the housing 100, and the driving output shaft 106 penetrates through the second assembly hole 110b and is rotatably supported in the housing 100; the driving gear 104 is assembled at the end part of the motor shaft 111, the driven gear 107 is assembled at the driving output shaft 106, and the driving gear 104 and the driven gear 107 are meshed and connected to form a rotary gear pair; the sealing assembly comprises at least one oil separation pressure reducing ring 101 and at least one sealing ring 102, the inner periphery of the oil separation pressure reducing ring 101 and the cylindrical surface of the shaft form a preset gap 301 to achieve the effect of gap sealing, and the sealing ring 102 is in contact connection with the cylindrical surface of the shaft to achieve contact sealing; the motor shaft 111 and the driving output shaft 106 are respectively provided with at least one group of sealing components, and the sealing of the joint of the shaft and the shell is realized through the sealing components, so that the leakage of liquid lubricating oil is reduced, and the service life of the bearing is prolonged.

In the embodiment, the liquid lubricating oil is used for lubricating, the liquid lubricating oil can completely infiltrate the meshed rotary gear pair, full oil film coverage on the meshed teeth can be realized in the gear running process, continuous and sufficient lubrication can be realized, meanwhile, the lubricating oil can accelerate the transmission of friction heat generated by the meshed teeth, and the temperature of the tooth surface is reduced; through the effective combination of two sealing forms of the gap seal of the middle oil pressure reducing ring and the shaft cylindrical surface and the contact seal of the sealing ring in the sealing assembly, the angle grinder using the liquid lubricating oil is ensured not to leak oil in the whole using process, and the long-time lubrication of the liquid lubricating oil to the rotary gear pair can be ensured by effectively sealing in the working state and the static state of the angle grinder, so that the service life of the angle grinder can be obviously prolonged, and the service life of the gear pair is prolonged by more than one time.

In this embodiment, the housing 100 includes a main housing 105 and an end cap 108, wherein a first fitting hole 110a is provided on the main housing 105, and a second fitting hole 110b is provided on the end cap 108. The end cap 108 is assembled to the main housing 105 to form an accommodating cavity for accommodating the transmission mechanism and the sealing assembly, wherein the end cap 108 is fastened to the main housing 105 by screws and sealed at the connecting seam by a third sealing ring 109, 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 mounting hole 110a, and the motor shaft 111 is penetratingly disposed at the first mounting hole 110a and rotatably supported by the first bearing 123. The end of the motor shaft 111 is provided with a driving gear 104, and the driving gear 104 and the motor shaft 111 cannot move relatively during operation. The sealing component configured on the motor shaft 111 is a first sealing component, and the first sealing component realizes sealing between the motor shaft 111 and the main housing 105. The motor shaft 111, the first bearing 123, the first sealing assembly and the first assembling hole 110a are coaxially arranged; the first sealing assembly comprises a first oil-separating pressure-reducing ring 101a and a first sealing ring 102a, wherein the first bearing 123, the first oil-separating pressure-reducing ring 101a and the first sealing ring 102a are sequentially fixed in the first assembling hole 110a in an interference fit manner from inside to outside.

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, the driving output shaft 106 penetrates through the second assembly hole 110b, and the driving 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 a second seal assembly that seals between the drive output shaft 106 and the end cap 108. The driving output shaft 106, the second bearing 122, the second sealing component and the second assembling hole 110b are coaxially arranged; the second sealing assembly comprises a second oil-separating pressure-reducing ring 101b and a second sealing ring 102b, and a second bearing 122, the second oil-separating pressure-reducing ring 101b and the second sealing ring 102b are sequentially fixed at the second assembling hole 110b in an interference fit manner from inside to outside. The driven gear 107 is disposed on the drive output shaft 106, and the end of the drive output shaft 106 is provided with a grinding head 114 for grinding.

Preferably, the shaft is disposed through the seal assembly, and the gap 301 between the oil-separating pressure relief ring and the shaft is set to 0.01-0.04mm, preferably 0.02-0.03mm, as shown in FIG. 2. The oil separation pressure reducing ring and the shaft form a gap seal, if the gap is too small, the technical realization is difficult, and if the gap is too large, oil leakage is easy, so the arrangement of the gap between the oil separation pressure reducing ring and the shaft is critical. Wherein, the clearance between the cylindrical surface of the motor shaft 111 and the first oil-separating pressure-reducing ring 101a is 0.02-0.03mm, and the clearance between the cylindrical surface of the driving output shaft 106 and the second oil-separating pressure-reducing ring 101b is 0.02-0.03 mm.

The first gap seal, namely the oil-separating pressure-reducing ring 101 and the motor shaft 111 or the drive output shaft 106 have a small gap 301 in the radial direction, the purpose of oil separation is achieved through the matching of the small gap 301, and meanwhile due to the existence of the gap, the oil-separating pressure-reducing ring 101 cannot generate friction wear in the rotating motion process of the motor shaft 111 and the drive output shaft 106, so that the gap seal can play a good and consistent oil separation role in the whole angle grinder using process.

Referring to fig. 3, in the seal assembly in the present embodiment, the oil-separating pressure-reducing ring 101 is a dish-shaped structure, and includes an annular body 1011 and an outer ring 1012 perpendicular to the annular body 1011 along the circumferential direction, the oil-separating pressure-reducing ring 101 has the same outer diameter as the bearing, and the outer ring 1012 of the oil-separating pressure-reducing ring 101 abuts against the bearing, so that an accommodating space 131 for accommodating liquid lubricating oil is formed between the oil-separating pressure-reducing ring 101, the end surface of the bearing, and the cylindrical surface of the shaft. The oil-separating pressure-reducing ring 101, the end face of the bearing and the outer cylindrical surface of the motor shaft 111 or the drive output shaft 106 jointly enclose an annular accommodating space 131, the annular accommodating space 131 can accommodate lubricating oil flowing to the oil-separating pressure-reducing ring through the bearing to form an oil-containing space, the bearing can be fully lubricated by the flowing of the lubricating oil in the oil-containing space and the inner space of the gear box, the heat generated in the rotating process of the bearing is reduced, and the service life of the bearing is effectively prolonged.

Preferably, the oil-separating and pressure-reducing ring 101 is integrally formed on the housing 100, and the integrally formed housing has the advantage of simple forming process. Alternatively, the oil-separating and pressure-reducing ring 101 is made of a metal material and is assembled to the housing 100. The oil-separating pressure-reducing ring made of metal material has higher strength and rigidity, and can effectively bear the pressure difference in the running process of the gear box, thereby playing a good role of pressure reduction, reducing the pressure difference between the inner side and the outer side of the sealing ring mainly made of rubber material in contact sealing, improving the sealing performance of the contact sealing and prolonging the service life of the contact sealing.

Preferably, the space in the gear box except the transmission mechanism and the sealing assembly is a residual space, wherein the gear box is filled with liquid lubricating oil 201, and the liquid lubricating oil 201 fills 80% -95% of the residual space. By adding the liquid lubricating oil 201 into the gear box, the meshing gear pair is always in a lubricating oil infiltration state, and full oil film coverage and continuous and sufficient lubrication of meshing teeth can be realized in the gear running process.

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 is formed by two seal rings mainly made of rubber materials and respectively forms contact seals with the outer cylindrical surfaces of the motor shaft 111 and the drive output shaft 106. Preferably, the sealing ring 102 is a framework oil seal.

In this embodiment, for convenience of processing and installation, the first oil-separating pressure-reducing ring 101a and the first seal ring 102a have the same outer diameter as the first bearing 123, and the second oil-separating pressure-reducing ring 101b has the same outer diameter as the second bearing 122. In this embodiment, referring to fig. 1 and 4, at the first assembly hole 110a, the driving gear 104, the first bearing 123, the first oil-separating pressure-reducing ring 101a, and the first seal ring 102a are sequentially disposed from inside to outside, and are fixed at the outer side of the first seal ring 102a by a flange 103, and the flange 103 is fixed with the main housing 105 by screws, and axially limits the play of the first oil-separating pressure-reducing ring 101a and the first seal ring 102 a.

Referring to fig. 4, in the present embodiment, the second fitting hole 110b includes a first step portion 1101 and a second step portion 1102, wherein the second seal ring 102b is fitted at the first step portion 1101, the second oil-separating pressure-reducing ring 101b is fitted at the second step portion 1102, and the second bearing 122 is fitted inside the second oil-separating pressure-reducing ring 101 b. A fitting groove is provided at a predetermined position in the main housing 105, a third bearing 121 is fixed in the fitting groove, and one end of the drive output shaft 106 is rotatably supported by the third bearing 121.

In this embodiment, the sealing assembly employs one oil-separating pressure-reducing ring 101 and one sealing ring 102, but in other alternative embodiments, the number of the oil-separating pressure-reducing rings 101 in the sealing assembly may be selected to be 1, 2, 3 or more, the number of the sealing rings 102 may also be 1, 2, 3 or more, and the numbers of the oil-separating pressure-reducing rings 101 and the sealing rings 102 in the sealing assembly may be set according to actual sealing requirements. Wherein, it is required to ensure that the outer sides of the first bearing 123 and the second bearing 122 are respectively pressed with an oil-separating pressure-reducing ring 101 for forming a clearance seal. The number of the oil-separating and pressure-reducing rings 101 and the sealing rings 102 is not used to limit the protection scope of the present invention, and is not described herein again.

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

the third bearing 121 is pressed in the main housing 105 in advance, the driving gear 104 is pre-assembled in the main housing 105, the first bearing 123, the first oil separating and pressure reducing ring 101a and the first sealing ring 102a are press-assembled in the first assembling hole 110a, the motor shaft 111 is assembled in the first assembling hole 110a, and a flange plate 103 is assembled outside the first assembling hole 110a to form a first assembly. The second seal ring 102b, the second oil-separating pressure-reducing ring 101b, and the second bearing 122 are sequentially press-fitted into the second fitting hole 110b, the drive output shaft 106 is press-fitted into the second fitting hole 110b, the driven gear 107 is press-fitted to the drive output shaft 106, and the second assembly and the first assembly are assembled to form the gear box.

Liquid lubricating oil can be filled in the first assembly, or an oil filling hole is formed in the shell 100, and after the gear box is assembled and formed, the lubricating oil is filled through the oil filling hole.

Example 2

The present embodiment provides an angle grinder filled with liquid lubricant, and fig. 5 and 6 are schematic structural diagrams of the angle grinder of the present embodiment, wherein the angle grinder of the present embodiment includes the gear box, the driving motor 112 and the grinding head 114 described in embodiment 1, the driving motor 112 is a driving motor, the driving motor may be a brush motor or a brushless motor with electronic drive, the driving motor 112 is installed in a motor housing 113, and the motor shaft 111 is rotatably supported in the main housing 105. A grinding head 114 is fixed at the end of the driving output shaft 106, and the grinding head 114 works for cutting or grinding tools such as cutting plates, friction plates and the like.

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

The above disclosure is only illustrative of the preferred embodiments of the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. It should be understood that these examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. In practical applications, the improvement and adjustment made by those skilled in the art according to the present invention still belong to the protection scope of the present invention.

Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention. The present invention is 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 content of the first and second substances,

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.

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 gear box lubricated by using 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 which is perpendicular to the annular body along the circumferential direction, the oil-separating pressure reducing ring has the same outer diameter as that of 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 seal structure of a gear box of an angle grinder lubricated with lubricating oil according to any one of claims 1 to 9.

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