CN212486256U - Air-cooled alternating-current generator - Google Patents

Abstract

The utility model provides an air-cooled alternator, includes front end housing, rear end cap, rotor, stator and belt pulley, the stator is installed in the accommodation space that front end housing and rear end cap enclose to close, the rotor corresponds the stator sets up to correspond the erection bracing through front bearing and rear bearing respectively on front end housing and the rear end cap, the belt pulley with the output shaft of rotor, the belt pulley with be provided with between the front end housing and support the cover, support the cover and install the rotor shaft of front end housing is downthehole, just support the both ends of cover respectively with front bearing and belt pulley butt, still be provided with flexible elastic seal spare between front end housing and the belt pulley. The utility model is suitable for a bad application operating mode sets up flexible elastic sealing element in the front bearing mounted position outside, can guarantee that the bearing is located operational environment ideal more and stable, guarantees that bearing operation life-span does not receive the outside rugged environment.

Description

Air-cooled alternating-current generator

Technical Field

The utility model relates to an air-cooled alternator for motor vehicle, especially an air-cooled alternator suitable for adverse circumstances.

Background

A prior art automotive alternator, as shown in fig. 1A, generally includes a pulley 1, a front end housing 2, a stator 3, a rotor 4, a rear end housing 5, a regulator assembly 6, a rectifier bridge 7, a shroud 8, a front bearing 9, a rear bearing 10, and a support sleeve 11. The rotor 4 generally includes a front fan 41, a rear fan 42, a rotor shaft 43, a claw machine 44, a field winding 45, and a slip ring 46. The rotor 4 is connected to the front end cover 2 via a front bearing 9. The rotor 4 is connected to the rear end cap 5 via a rear bearing 10.

The alternating current generator is a product which converts the mechanical energy of the engine into electric energy to be output by utilizing the electromagnetic induction principle that a wire cuts a magnetic line of force to induce electric potential. As shown in fig. 1B, the rotor 4 generally includes a front fan 41, a rear fan 42, a rotor shaft 43, a claw mechanism 44, a field winding 45, and a slip ring 46. The excitation winding 45 is supplied with a direct current to generate a magnetic field (referred to as a rotor magnetic field) having a distribution close to a sine wave. The stator 3 is generally composed of three-phase windings in which cores are uniformly arranged, and the like. When the engine runs, the belt pulley 1 is driven, the rotor 4 is driven to rotate through the front bearing 9 and the rear bearing 10, the rotor magnetic field rotates along with the rotor, each phase winding of the stator 3 is sequentially cut by magnetic lines of force per revolution, and three-phase alternating current potential is induced in the three-phase stator winding. The induced three-phase ac potential is full-wave rectified by the rectifier 7, and then supplies power to an external load in a state similar to dc. The regulator assembly 6, with the allowable voltage of the system as a reference point, realizes the stabilization of the external output voltage of the generator by regulating the direct current flowing through the excitation winding 45 of the rotor 4.

During the operation of the electric machine, the pulley 1 is dragged by the engine belt to rotate, and the blades 41 and 42 arranged circumferentially on the rotor 4 compress the air to generate a pressure difference when rotating, so as to generate a high pressure on the windward side of the blades and a low pressure on the leeward side of the fan. Under the action, the internal space of the motor is in a low-pressure state during the rotation of the generator of the double internal cooling fan. At this time, the outside air enters the inside of the motor through the ventilation holes arranged on the generator shield 8, and is discharged into the outside air through the ventilation holes arranged on the rear end cover 5, so as to form a rear cooling air duct of the generator. At this time, as shown in fig. 1C, the outside air enters the inside of the motor through the vent hole 21 provided in the front end cover 2 of the generator, and is discharged into the outside air through the vent hole 22 provided in the front end cover, so as to form a front cooling air duct of the generator.

Based on the above information, the front bearing 9 and the rear bearing 10 are the key to the principle implementation of the generator function. The life of the front bearing 9 and the rear bearing 10 directly determines the reliable operating life of the generator. Based on the aforesaid cooling air duct trend during the generator operation, the front bearing 9 will encounter great challenges in the generator operation if a continuous flushing environment is encountered, and the sealing protection of the front bearing 9 is met.

The structure of the conventional deep groove ball bearing is shown in fig. 1D, and comprises a bearing outer ring 91, a bearing inner ring 92, bearing balls 93, a retainer 95 and a sealing cover 94, and grease for ensuring the reliable operation of the bearing is filled in the bearing. The bearing outer ring 91 and the bearing inner ring 92 realize relative rotation through the balls 93. The balls 93 perform the radial positioning function of the bearing through the retainer 95. In a static state of the bearing, the sealing structure of the bearing sealing ring 94 can effectively ensure the protection of the bearing outer ring 91 and the bearing inner ring 92, and prevent external foreign matters from entering the inside of the bearing. However, during the operation of the bearing, the connection part of the sealing structure of the bearing sealing ring 94 and the bearing inner ring 92 is in a relative motion state, and the internal air pressure disturbance inside the bearing due to the motion of the balls 93 can also affect the sealing performance of the bearing sealing cover 94 and the bearing inner ring 92, and in a severe case, external foreign matters can enter the inside of the bearing through the connection position.

The front bearing 9 of the alternating-current generator usually adopts narrow slits and a labyrinth design to realize the external sand protection and water prevention of the bearing part, and fully adopts the narrow slits and the labyrinth structure to realize the reduction of external water volume and water pressure, thereby ensuring the degree of external foreign matter entering the bearing, especially when the bearing is static. As shown in FIG. 1A, a zigzag narrow slit labyrinth design is formed by the belt pulley 1, the front end cover 2 and the support sleeve 11, so that the application environment of the front bearing 9 is optimized. The structure can effectively ensure the operations such as high-pressure flushing and the like under the static state of the vehicle. However, when the generator is in operation, if continuous water pressure and water quantity are formed and continuously exist in the narrow slit labyrinth structure, the probability of water inflow of the bearing is greatly improved. The deep water washing tank is usually used for daily engineering vehicles to pass through a deep water washing tank, and the working condition of a high-pressure washing area is particularly under the condition that the working condition lasts for a long time. When water enters the bearing, the grease is degraded, the lubricating capability of the grease is reduced, the service life of the bearing is directly affected, the bearing is heated at a high temperature, the inner retainer 95 is broken, and the bearing loses the radial support and running functions of the rotor, so that the generator fails.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to the above-mentioned defect of prior art, provide an air-cooled alternator suitable for adverse circumstances.

In order to achieve the above object, the utility model provides an air-cooled alternator, including front end housing, rear end cap, rotor, stator and belt pulley, the stator is installed in the accommodation space that front end housing and rear end cap enclose to close, the rotor corresponds the stator sets up to correspond the installation through front bearing and rear bearing respectively and support on front end housing and the rear end cap, the belt pulley with the output shaft of rotor, the belt pulley with be provided with between the front end housing and support the cover, support the cover and install the rotor shaft of front end housing is downthehole, just support the both ends of cover respectively with front bearing and belt pulley butt, wherein, still be provided with flexible elastic sealing spare between front end housing and the belt pulley.

The flexible elastic sealing element comprises a rigid supporting part and a flexible sealing part, an end cover boss extending outwards is arranged at the edge of a through hole of a rotor shaft of the front end cover, the rigid supporting part is installed on the end cover boss, the flexible sealing part is installed on the rigid supporting part, and the flexible sealing part is abutted to the end face of the belt pulley.

In the above air-cooled alternator, a first boss and a second boss are disposed on a side of the belt pulley connected to the flexible sealing portion, the first boss abuts against the support sleeve, an outer diameter of the first boss is smaller than an outer diameter of the support sleeve, and an outer edge of the flexible sealing portion abuts against an inner side of the second boss.

The air-cooled alternating-current generator is characterized in that the flexible elastic sealing element comprises a rigid supporting part and a flexible sealing part, a belt pulley boss extending outwards is arranged at the position of the output shaft connecting hole of the rotor, the rigid supporting part is installed on the belt pulley boss, the flexible sealing part is installed on the rigid supporting part, and the flexible sealing part is abutted to the end face of the front end cover.

The air-cooled alternator comprises a flexible sealing portion, wherein the flexible sealing portion comprises a body and a plurality of annular lip edges connected with the body, the annular lip edges are coaxially arranged, and a positioning groove is formed in the inner side of the body.

The above air-cooled alternator wherein a radially outwardly extending projection is provided at an edge of the annular lip of the outermost ring.

In the above air-cooled alternator, the flexible elastic sealing element is a rubber sealing ring wrapped outside the support sleeve, and the rubber sealing ring and the support sleeve are an integral injection molding part.

The air-cooled alternator comprises a rubber sealing ring, wherein the rubber sealing ring comprises a sealing ring body and a first sealing portion arranged on the outer surface of the sealing ring body, and the outer surface of the first sealing portion abuts against the inner wall of the rotor shaft through hole of the front end cover.

The air-cooled alternator further comprises a second sealing portion coaxially arranged with the first sealing portion, the second sealing portion is connected with the sealing ring body and located on the outer side of the first sealing portion, and the outer edge of the second sealing portion abuts against the end face of the front end cover.

In the above air-cooled alternator, the first sealing portion is provided with a plurality of annular grooves parallel to each other, the second sealing portion is of an annular structure, an annular surface of the annular structure is inclined toward the first sealing portion, and an annular protrusion is provided at an outer edge of the annular surface of the annular structure.

The technical effects of the utility model reside in that:

the utility model discloses be more applicable to abominable applied operating mode, bearing mounted position outside is provided with flexible elastic sealing element in the front, guarantees that the bearing is located operational environment ideal more and stable, guarantees that bearing operation life-span does not receive the abominable environment in outside, especially harsh water environment, for example, non-road vehicle receives the condition that external high pressure water continuously erodees when actually moving.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

Drawings

FIG. 1A is a schematic diagram of a prior art air-cooled alternator;

FIG. 1B is a schematic view of a prior art rotor configuration;

FIG. 1C is a schematic view of a prior art front end cap configuration;

FIG. 1D is a schematic view of a prior art front bearing configuration;

fig. 2A is a schematic structural view of an air-cooled ac generator according to an embodiment of the present invention;

fig. 2B is a schematic structural view of a front end cover according to an embodiment of the present invention;

fig. 2C is a schematic structural view of a flexible elastic sealing member according to an embodiment of the present invention;

FIG. 2D is a cross-sectional view of FIG. 2C;

fig. 2E is a schematic structural diagram of a belt pulley according to an embodiment of the present invention;

fig. 3A is a schematic structural view of an air-cooled alternator according to another embodiment of the present invention;

FIG. 3B is a schematic view of a pulley and flexible elastomeric seal according to another embodiment of the present invention;

fig. 4A is a schematic structural view of an air-cooled alternator according to another embodiment of the present invention;

FIG. 4B is a cross-sectional view of a flexible elastomeric seal according to yet another embodiment of the present invention;

fig. 5A is a schematic structural view of an air-cooled ac generator according to yet another embodiment of the present invention;

fig. 5B is a cross-sectional view of a flexible elastomeric seal according to yet another embodiment of the present invention.

Wherein the reference numerals

Prior Art

1 Belt pulley

2 front end cover

21 vent hole

22 vent hole

3 stator

4 rotor

41 front fan

42 rear fan

43 rotor shaft

44 claw machine

45 field winding

46 collector ring

5 rear end cover

6 regulator assembly

7 rectifier bridge

8 protective cover

9 front bearing

91 bearing outer ring

92 bearing inner race

93 bearing ball

94 sealing cover

95 holding rack

10 rear bearing

11 support sleeve

The utility model discloses

10 belt pulley

101 first boss

102 second boss

103 belt pulley boss

20 front end cover

201 rotor shaft via hole

202 end cover boss

30 stator

40 rotor

50 rear end cap

60 front bearing

70 rear bearing

80 support sleeve

90 flexible elastomeric seal

901 rigid support

902 flexible seal

903 body

904 annular lip

905 locating slot

906 convex

907 sealing ring body

908 first seal portion

909 second seal

910 annular projection

100 regulator

110 rectifier bridge

120 shield

Detailed Description

The following describes the structural and operational principles of the present invention in detail with reference to the accompanying drawings:

referring to fig. 2A-2E, fig. 2A is the air-cooled alternator structure schematic diagram of an embodiment of the present invention, fig. 2B is the front end cover 20 structure schematic diagram of an embodiment of the present invention, fig. 2C is the sealing member structure schematic diagram of an embodiment of the present invention, fig. 2D is the cross-sectional view of fig. 2C, fig. 2E is the belt pulley 10 structure schematic diagram of an embodiment of the present invention. The utility model discloses an air-cooled alternator, including front end housing 20, rear end housing 50, rotor 40, stator 30 and belt pulley 10, still include regulator 100, rectifier bridge 110, guard shield 120 etc, stator 30 installs in the accommodation space that front end housing 20 and rear end housing 50 enclose to close, rotor 40 corresponds to stator 30 sets up, contains front fan, back fan, rotor 40 axle, claw machine, magnetic field winding and current collecting ring etc. usually, and this rotor 40 axle is installed through front bearing 60 and is supported front end housing 20 respectively, through rear bearing 70 installation support on rear end housing 50, belt pulley 10 with the output shaft of rotor 40, belt pulley 10 with be provided with support cover 80 between front end housing 20, support cover 80 installs in front end housing 20's rotor 40 axle through hole 201, just support cover 80's both ends respectively with front bearing 60 and belt pulley 10 butt, the front end cap 20 is further provided with a flexible elastic seal 90 corresponding to the front bearing 60. The composition, structure, mutual position relation, connection relation and function etc. of other parts of this air-cooled alternator are more mature prior art, so do not do the repeated description here, only explain in detail below the structure, position and connection relation of the utility model discloses a flexible elastic sealing member 90.

Referring to fig. 2C and 2D, in the present embodiment, the flexible elastic sealing element 90 is mounted on the front end cover 20 to achieve sealing, the flexible elastic sealing element 90 includes a rigid support portion 901 and a flexible sealing portion 902, an end cover boss 202 extending outward is disposed at an edge of the shaft through hole 201 of the rotor 40 of the front end cover 20, the rigid support portion 901 is mounted on the end cover boss 202 and may be connected by interference fit, the flexible sealing portion 902 is mounted on the rigid support portion 901, and the flexible sealing portion 902 abuts against an end face of the pulley 10. A first boss 101 and a second boss 102 may be further disposed on a side of the pulley 10 connected to the flexible sealing portion 902, the first boss 101 abuts against the support sleeve 80, an outer diameter of the first boss 101 is smaller than an outer diameter of the support sleeve 80, an outer edge of the flexible sealing portion 902 abuts against an inner side of the second boss 102, and the second boss 102 may form a radial barrier for an outer edge of the flexible sealing portion 902, i.e., an annular lip 904.

Referring to fig. 3A and 3B, fig. 3A is a schematic structural view of an air-cooled alternator according to another embodiment of the present invention, and fig. 3B is a schematic connection view of a belt pulley 10 and a sealing member according to another embodiment of the present invention. In this embodiment, the flexible elastic sealing element 90 is installed on the pulley 10 to realize sealing, the flexible elastic sealing element 90 includes a rigid support portion 901 and a flexible sealing portion 902, an outwardly extending pulley boss 103 is disposed at an output shaft connection hole of the pulley 10 and the rotor 40, the rigid support portion 901 is installed on the pulley boss 103 and can be connected by interference fit, the flexible sealing portion 902 is installed on the rigid support portion 901, and the flexible sealing portion 902 abuts against an end face of the front end cover 20.

The rigid support 901 is preferably made of steel, the steel may be 45# steel, 20# steel, etc., and the flexible sealing portion 902 is preferably made of rubber. The rubber material can be selected according to the temperature rise of the product, and the rubber material can be preferably Nitrile Butadiene Rubber (NBR), acrylate rubber (ACM) and fluorine rubber (FPM) according to the temperature from low to high. Wherein, the nitrile rubber is preferably selected when the working temperature is-30 ℃ to 100 ℃; the working temperature is preferably acrylate rubber at-25 ℃ to 150 ℃; the working temperature is preferably-20 ℃ to 200 ℃ and is preferably fluororubber. The rigid support 901 and the flexible sealing portion 902 may be formed by one-time injection molding. The flexible sealing portion 902 comprises a body 903 and a plurality of annular lips 904 connected with the body 903, the annular lips 904 are coaxially arranged, and a positioning groove 905 is arranged on the inner side of the body 903 and used for realizing circumferential limitation of the flexible sealing portion 902. Wherein, the edge of the annular lip edge 904 at the outermost ring is provided with a bulge 906 extending along the radial direction, so that after the outside is subjected to wind pressure or water pressure, the annular lip edge 904 can be pressed by converted pressure to be attached to the end surface of the belt pulley 10, and the protection and isolation of the external harsh water environment are realized.

Referring to fig. 4A and 4B, fig. 4A is a schematic structural view of an air-cooled alternator according to another embodiment of the present invention, and fig. 4B is a cross-sectional view of a sealing member according to another embodiment of the present invention. The composition, structure, mutual position relationship, connection relationship and functions of other parts of this embodiment are the same as those of the previous embodiment, and the difference is that the flexible elastic sealing element 90 of this embodiment is directly integrated with the supporting sleeve 80, the flexible elastic sealing element 90 is a rubber sealing ring coated outside the supporting sleeve 80, and the rubber sealing ring and the supporting sleeve 80 are preferably integrally injection-molded parts, which not only satisfies the supporting adjustment function, but also can realize the sealing effect. The two ends of the support sleeve 80 are respectively connected with the pulley boss 103 and the inner steel ring of the front bearing 60 in a contact and compaction manner, the pulley boss 103 is directly abutted on the support sleeve 80, and the outer diameter of the pulley boss 103 is smaller than that of the support sleeve 80. The rubber sealing ring comprises a sealing ring body 907 and a first sealing part 908 arranged on the outer surface of the sealing ring body 907, the outer surface of the first sealing part 908 abuts against the inner wall of the rotor 40 shaft through hole 201 of the front end cover 20, the outer surface of the first sealing part 908 and the inner surface of the rotor 40 shaft through hole 201 are preferably in transition fit, and the sealing ring body 907 and the supporting sleeve 80 are compacted on the inner steel ring of the front bearing 60 together.

Referring to fig. 5A and 5B, fig. 5A is a schematic structural view of an air-cooled alternator according to another embodiment of the present invention, and fig. 5B is a sectional view of a flexible elastic sealing member 90 according to another embodiment of the present invention. In this embodiment, the composition, structure, mutual positional relationship, connection relationship and functions thereof of other parts are the same as those of the air-cooled alternator shown in fig. 4A, and the difference of this embodiment is that the flexible elastic sealing member 90 further includes a second sealing portion 909, the second sealing portion 909 is connected to the sealing ring body 907 and is located outside the first sealing portion 908, and an outer edge of the second sealing portion 909 abuts against an end surface of the front end cover 20. The first sealing portion 908 is provided with a plurality of annular grooves parallel to each other, the second sealing portion 909 is a circular ring structure, an annular surface of the circular ring structure faces the first sealing portion 908, an annular protrusion 910 is disposed at an outer edge of the annular surface of the circular ring structure, and after the assembly, when the external environment is subjected to wind pressure or water pressure, the second sealing portion 909 can be pressed by converting pressure to be attached to the end surface of the front end cover 20.

The utility model discloses an air-cooled alternator for motor vehicle, its flexible elastic sealing member can be applied to the belt pulley wheel side of the abominable front bearing of operating mode, also can be applied to the front bearing rotor side, or the protection of rear bearing rotor side, the specially adapted severe water environment. The protective structure made of flexible elastic materials is arranged on the peripheral structure of the bearing installation position of the rotating key part of the generator, and can effectively prevent or relieve external harsh water environment from entering the bearing configuration space, so that the working environment of the bearing is more ideal, and the running life of the bearing is more stably ensured not to be limited by the harsh environment outside.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims (10)

1. The utility model provides an air-cooled alternator, includes front end housing, rear end cap, rotor, stator and belt pulley, the stator is installed in the accommodation space that front end housing and rear end cap enclose to close, the rotor corresponds the stator sets up to correspond the installation support through front bearing and rear bearing respectively on front end housing and the rear end cap, the belt pulley with the output shaft of rotor, the belt pulley with be provided with between the front end housing and support the cover, support the cover and install the rotor shaft of front end housing is downthehole, just support the both ends of cover respectively with front bearing and belt pulley butt, its characterized in that, still be provided with flexible elastic sealing spare between front end housing and the belt pulley.

2. The air-cooled alternator according to claim 1, wherein the flexible elastomeric seal comprises a rigid support portion and a flexible seal portion, wherein the rotor shaft through hole edge of the front end cap is provided with an end cap boss extending outward, the rigid support portion is mounted on the end cap boss, the flexible seal portion is mounted on the rigid support portion, and the flexible seal portion abuts against the end face of the pulley.

3. The air-cooled alternator according to claim 2, wherein a first boss and a second boss are provided on a side of the pulley connected to the flexible sealing portion, the first boss abuts against the support sleeve, an outer diameter of the first boss is smaller than an outer diameter of the support sleeve, and an outer edge of the flexible sealing portion abuts against an inner side of the second boss.

4. The air-cooled alternator according to claim 1, wherein the flexible elastic sealing member includes a rigid support portion and a flexible sealing portion, the pulley is provided with a pulley boss extending outward at the output shaft connection hole of the rotor, the rigid support portion is mounted on the pulley boss, the flexible sealing portion is mounted on the rigid support portion, and the flexible sealing portion abuts against the end face of the front end cover.

5. An air-cooled alternator according to claim 2, 3 or 4, wherein the flexible seal comprises a body and a plurality of annular lips connected to the body, the plurality of annular lips being coaxially arranged, the body being provided with locating grooves on an inner side thereof.

6. An air-cooled alternator according to claim 5, wherein a radially outwardly extending projection is provided at the edge of the annular lip of the outermost ring.

7. The air-cooled alternator according to claim 1, wherein the flexible elastomeric seal is a rubber seal wrapped around the support sleeve, the rubber seal being an integral injection molded part of the support sleeve.

8. The air-cooled alternator according to claim 7, wherein the rubber seal includes a seal body and a first seal portion provided on an outer surface of the seal body, an outer surface of the first seal portion abutting against an inner wall of the rotor shaft passage hole of the front cover.

9. The air-cooled alternator according to claim 8, wherein the flexible elastic sealing member further includes a second sealing portion disposed coaxially with the first sealing portion, the second sealing portion being connected to the seal ring body and located outside the first sealing portion, an outer edge of the second sealing portion abutting against an end surface of the front end cover.

10. The air-cooled alternator according to claim 9, wherein the first sealing portion is provided with a plurality of annular grooves parallel to each other, the second sealing portion has an annular structure, the annular surface of the annular structure is inclined toward the first sealing portion, and an annular protrusion is provided at an outer edge of the annular surface of the annular structure.

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