CN215761999U - Double-speed-reduction starter for automobile engine - Google Patents

Abstract

The utility model discloses a double-reduction starter for an automobile engine, which relates to the technical field of automobile starters and comprises a planet wheel primary reduction gear, a gear secondary reduction gear, an electromagnetic switch, an armature, a stator assembly, a brush carrier assembly, a front cover and a rear cover; the planet wheel primary speed reducer is connected with the gear secondary speed reducer, and the planet wheel primary speed reducer and the gear secondary speed reducer are both positioned in the front cover; the electromagnetic switch is arranged on the front cover and is connected with the gear secondary speed reducer; the armature is positioned in the stator assembly and is connected with the planet wheel primary speed reducing device; the stator assembly is arranged between the front cover and the rear cover; the brush holder assembly is positioned at the rear ends of the armature and the stator assembly, and the rear cover covers the rear end of the brush holder assembly. The rotation output by the armature is decelerated twice, so that the speed reduction ratio is high, and the output torque is large, so that an automobile engine is started; in addition, in the permanent magnet stator assembly, a plurality of auxiliary magnetic strips and a plurality of magnetic shoes are arranged through a plurality of positioning sheets, so that the structure is simple, and the installation is convenient.

Description

Double-speed-reduction starter for automobile engine

Technical Field

The utility model relates to the technical field of automobile starters, in particular to a double-speed-reduction starter for an automobile engine.

Background

The starter is also called a motor, and converts electric energy into mechanical energy to drive the flywheel of the engine to rotate so as to start the engine. The starter is divided into a direct current starter, a gasoline starter, a compressed air starter and the like according to the working principle. The direct current starters are mostly adopted in internal combustion engines, and are characterized by compact structure, simple operation and convenient maintenance. The dc starter, which is used exclusively to start the engine, requires a strong torque, and therefore, the amount of current to be passed is large, reaching several hundred amperes.

At present, the starting of an automobile engine is realized through external force, and a common starting mode is starting through a direct-current starter. In a dc starter, the rotation speed of an armature is high and the output torque is small, and in order to increase the output torque of the starter, a reduction mechanism is often connected to the output end of the armature to allow the starter to output a high torque.

In the prior art, a chinese patent with application number CN202021982371.1 discloses a novel planetary deceleration dc starter, relating to the technical field of automobile starters. The utility model comprises a front cover, a shell, a transmission shaft assembly, an electromagnetic switch, a stator, an armature, a brush holder assembly and a rear cover, and is different from the working mode of the traditional automobile starter; when the engine is stopped, the flywheel and the driving gear are automatically meshed together, and preparation is made for the next starting. Compared with a common automobile starter, the starter has the advantages that the starting frequency and the frequency are multiplied, the service life of the motor is more than 30 ten thousand times, and the performance requirements of a new energy oil-electric hybrid automobile on the high starting frequency and the high starting frequency of the starter are met.

In the above patent, the rotation output from the armature is decelerated by the planetary gear and the reduction ring gear, so that the starter outputs a high torque. However, for some automobile engines which need higher torque to start, the transmission shaft assembly for the starter is only provided with one-time speed reduction, so that the output torque is relatively low, and the starting requirement of the automobile engine cannot be met. In addition, the permanent magnet stator assembly of the starter has a complex structure and is inconvenient to install.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model aims to provide a double-speed-reduction starter for an automobile engine, which is used for starting the automobile engine by reducing the speed of the rotation output by an armature twice, wherein the speed reduction ratio is high, and the output torque is large; in addition, in the permanent magnet stator assembly, a plurality of auxiliary magnetic strips and a plurality of magnetic shoes are arranged through a plurality of positioning sheets, so that the structure is simple, and the installation is convenient.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a double-reduction starter for an automobile engine comprises a planet wheel primary reduction gear, a gear secondary reduction gear, an electromagnetic switch, an armature, a stator assembly, a brush carrier assembly, a front cover and a rear cover;

the planet wheel primary speed reducer is connected with the gear secondary speed reducer, and the planet wheel primary speed reducer and the gear secondary speed reducer are both positioned in the front cover; the electromagnetic switch is arranged on the front cover and connected with the gear secondary speed reducer to control the gear secondary speed reducer to move forwards or backwards so as to enable the gear secondary speed reducer to be meshed with or separated from a flywheel of an engine; the armature is positioned in the stator assembly, is connected with the planet wheel primary speed reducer and drives the planet wheel primary speed reducer to rotate; the stator assembly is arranged between the front cover and the rear cover; the brush holder assembly is positioned at the rear end of the armature and stator assembly, and the rear cover covers the rear end of the brush holder assembly.

The stator assembly comprises a stator shell, a plurality of positioning sheets, a plurality of auxiliary magnetic strips and a plurality of magnetic shoes; the magnetic shoe is arranged between two adjacent positioning sheets, and an armature installation cavity is formed on the inner sides of the auxiliary magnetic strips and the magnetic shoe.

Further, the planet wheel primary speed reducing device comprises a planet shaft, a plurality of planet wheels, a speed reducing gear ring and a mounting rack assembly;

the planet shaft is rotatably installed on the mounting frame assembly, and the planet wheels are rotatably installed on the planet shaft, are positioned in the speed reduction gear ring and are meshed with the speed reduction gear ring and the armature gear of the armature.

Furthermore, a planet wheel mounting disc is arranged at the rear end of the planet shaft, and a plurality of planet wheel mounting columns are arranged on the planet wheel mounting disc; and the planet shaft is provided with a positioning clamping ring for limiting the rear end position of the isolator and a speed reduction gear ring adjusting pad for adjusting the axial position of the speed reduction gear ring on the planet shaft.

Further, the gear two-stage speed reduction device comprises a one-way device, a driving gear, a driving shaft, a driving gear shifting fork and a one-way device shifting fork;

the isolator is arranged on the planet shaft in a sliding mode, and an isolator gear is arranged on the isolator; the driving gear is slidably mounted on the driving shaft and meshed with the one-way gear, and the outer diameter of the driving gear is larger than that of the one-way gear; one end of the driving gear shifting fork is connected with the isolator, and the other end of the driving gear shifting fork is connected with the driving gear; one end of the isolator shifting fork is movably connected with the output end of the electromagnetic switch, and the other end of the isolator shifting fork is movably connected with the isolator and drives the isolator and the driving gear to synchronously move, so that the driving gear is meshed with or separated from a flywheel of the engine.

Furthermore, the isolator is in a penetrating cylindrical shape, the front end of the planet shaft penetrates through the isolator, the isolator gear is arranged at the front end of the isolator, the middle part of the outer wall of the isolator is provided with a clamping groove on a driving gear shifting fork, and the rear end of the outer wall of the isolator is provided with an isolator shifting fork hinge interface;

the driving gear is positioned below the isolator, and a lower clamping groove of a shifting fork of the driving gear is formed in the driving gear;

the upper part of the driving gear shifting fork is provided with a driving gear shifting fork upper clamping opening matched with the driving gear shifting fork upper clamping groove, and the lower part of the driving gear shifting fork is provided with a driving gear shifting fork lower clamping opening matched with the driving gear shifting fork lower clamping groove;

the upper portion of the isolator shifting fork is provided with an isolator shifting fork upper opening, the middle portion of the isolator shifting fork is provided with a rotating fulcrum, and the lower portion of the isolator shifting fork lower clamping opening.

Furthermore, a blocking sleeve is arranged between the outer wall of the front end of the isolator and the front cover, and a steel wire clamping ring clamped on the side wall of the isolator is arranged in the blocking sleeve;

the front end of the driving shaft is provided with a flat milling platform for radially stopping rotation of the driving shaft, and a positioning rotation stopping pin is clamped on the flat milling platform; the rear end of the driving shaft is provided with a shaft collar and sleeved with a compression spring, and the compression spring is positioned between the shaft collar and the front cover.

Furthermore, the stator shell is cylindrical, and a positioning plate limiting boss for axially limiting the position of the positioning plate and a positioning plate positioning boss for axially and radially fixing the position of the positioning plate are arranged in the stator shell; and the positioning sheet is provided with a positioning sheet positioning boss hole matched with the positioning sheet positioning boss.

Further, the spacer with be provided with the adhesive linkage between the stator casing inside wall, be provided with supplementary magnetic stripe support bar, supplementary magnetic stripe location strip, the radial fixed strip of magnetic shoe and magnetic shoe axial screens strip on the spacer, the material of spacer is the stainless steel.

Furthermore, a stator assembly positioning boss is arranged on the outer wall of the stator shell, and a gap is formed in the side wall of the rear end of the stator shell; the auxiliary magnetic strip is made of ferrite, and the magnetizing direction is in a lateral direction; the magnetic shoe is made of ferrite, and the magnetizing direction is radial.

Further, the brush holder assembly comprises a brush holder, and a wire protecting sleeve, a positive carbon brush and a negative carbon brush which are arranged on the brush holder.

The utility model has the beneficial effects that:

1. in the utility model, for the rotation output by the armature, the first-stage speed reducing device of the planet wheel reduces the speed of the rotation for the first time, the second-stage speed reducing device of the gear reduces the speed of the rotation for the second time, the speed reduction and speed reduction ratios of the two times are high, and the output torque is large, so that an automobile engine which can be started only by large torque can be smoothly started.

2. When an automobile engine is started, the electromagnetic switch controls the shifting fork of the isolator to rotate to drive the isolator at the lower end of the shifting fork to move forwards, and when the isolator moves forwards, the shifting fork of the driving gear synchronously drives the driving gear to move forwards so that the driving gear is meshed with a flywheel of the engine; and meanwhile, the armature rotates in the stator assembly, the rotation of the armature is subjected to primary speed reduction through the planet gear and the speed reduction gear ring, the speed of the isolator and the driving gear is reduced in a secondary speed reduction mode, and finally the rotation is transmitted to the driving gear, and the driving gear drives the flywheel of the engine to rotate so as to realize the starting of the automobile engine.

3. In the stator assembly, the plurality of positioning sheets are arranged in the stator shell along the circumferential direction of the stator shell, the auxiliary magnetic strips are arranged on the plurality of positioning sheets, the magnetic shoes are arranged between two adjacent positioning sheets, and the inner sides of the auxiliary magnetic strips and the magnetic shoes form an armature installation cavity, so that the stator assembly is simple in structure and convenient to install; meanwhile, the auxiliary magnetic strips are arranged to assist, supplement and strengthen the main magnetic field generated by the magnetic tiles.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a right side view of the present invention;

FIG. 3 is a schematic view of a planetary gear primary reduction gear of the present invention;

FIG. 4 is a schematic view of a planet axle of the present invention;

FIG. 5 is a schematic view of the gear reduction stage of the present invention;

FIG. 6 is a schematic view of an isolator according to the present invention;

FIG. 7 is a schematic view of the drive gear of the present invention;

FIG. 8 is a schematic view of the drive gear fork of the present invention;

FIG. 9 is a schematic view of a one-way clutch fork of the present invention;

FIG. 10 is a side view of the stator assembly of the present invention;

FIG. 11 is a cross-sectional view of a stator assembly of the present invention;

FIG. 12 is a cross-sectional view of a stator housing of the stator assembly of the present invention;

FIG. 13 is a left side view of a locating tab of the stator assembly of the present invention;

FIG. 14 is a right side view of a locating tab of the stator assembly of the present invention;

FIG. 15 is a schematic view of a locating tab in the stator assembly of the present invention;

FIG. 16 is a schematic view of an auxiliary magnetic stripe in the stator assembly of the present invention;

FIG. 17 is a schematic view of a brush holder assembly according to the present invention;

reference numerals:

1. a planet wheel primary speed reducing device; 11. a planet shaft; 111. a planet wheel mounting disc; 112. a planet wheel mounting post; 12. a planet wheel; 13. a reduction gear ring; 14. a mounting bracket assembly; 15. a positioning collar; 16. a reduction gear ring adjusting pad; 2. a gear secondary reduction unit; 21. a one-way clutch; 211. an isolator gear; 212. a clamping groove is formed in the shifting fork of the driving gear; 213. a isolator shift fork hinge interface; 22. a drive gear; 221. a lower clamping groove of a shifting fork of the driving gear; 23. a drive shaft; 231. milling a flat platform; 24. driving a gear shifting fork; 241. driving a gear shifting fork to clamp the opening; 242. a lower clamping opening of a shifting fork of the driving gear; 25. a one-way clutch shift fork; 251. the isolator shifting fork is provided with an upper opening; 252. a rotation fulcrum; 253. a lower clamping opening of the isolator shifting fork; 201. a blocking sleeve; 202. a steel wire retainer ring; 203. positioning the rotation stopping pin; 204. a collar for the shaft; 205. a compression spring; 3. an electromagnetic switch; 4. an armature; 5. a stator assembly; 51. a stator housing; 511. a boss is limited by the positioning plate; 512. the positioning lug boss is positioned by the positioning piece; 513. a stator assembly positioning boss; 514. a notch; 52. positioning plates; 521. the positioning piece positions the boss hole; 522. auxiliary magnetic stripe support bars; 523. auxiliary magnetic strip positioning strips; 524. radial magnetic shoe fixing strips; 525. the magnetic shoe is axially clamped by the clamping strip; 53. an auxiliary magnetic stripe; 54. a magnetic shoe; 55. an armature mounting cavity; 56. an adhesive layer; 6. a brush holder assembly; 61. a brush holder; 62. a wire protecting sleeve; 63. a positive electrode carbon brush; 64. a negative carbon brush; 7. a front cover; 8. and (7) a rear cover.

Detailed Description

The conception, the specific structure and the technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Example 1

A double-reduction starter for an automobile engine is shown in figure 1 and comprises a planet wheel primary reduction gear 1, a gear secondary reduction gear 2, an electromagnetic switch 3, an armature 4, a stator assembly 5, a brush carrier assembly 6, a front cover 7 and a rear cover 8;

the planet wheel primary speed reducer 1 is connected with the gear secondary speed reducer 2, and the planet wheel primary speed reducer 1 and the gear secondary speed reducer 2 are both positioned in the front cover 7; the electromagnetic switch 3 is arranged on the front cover 7 and connected with the gear secondary speed reducer 2 to control the gear secondary speed reducer 2 to move forwards or backwards so as to enable the gear secondary speed reducer 2 to be meshed with or separated from a flywheel of an engine; the armature 4 is positioned in the stator assembly 5, is connected with the planet wheel primary speed reducer 1 and drives the planet wheel primary speed reducer 1 to rotate; the stator assembly 5 is arranged between the front cover 7 and the rear cover 8; the brush holder assembly 6 is arranged at the rear ends of the armature 4 and the stator assembly 5, and the rear cover 8 covers the rear end of the brush holder assembly 6.

In the embodiment, the planet wheel primary speed reducer 1 is used for carrying out primary speed reduction on the rotation output by the armature 4; the gear secondary speed reducer 2 is used for carrying out secondary speed reduction on the rotation output by the armature 4 so as to output larger torque and further start an automobile engine; the electromagnetic switch 3 is used for controlling the gear secondary speed reducer 2 to be meshed with or separated from a flywheel of an engine and controlling the armature 4 to rotate; the armature 4 is used for generating rotation so as to drive the star wheel primary speed reducer 1 and the gear secondary speed reducer 2 to rotate; the stator assembly 5 is used for generating a magnetic field to rotate the armature 4; the brush holder assembly 6 is used for installing a carbon brush to conduct current; the front cover 7 and the rear cover 8 are a housing of the starter.

For the rotation output by the armature 4, the planet wheel primary speed reducer 1 performs primary speed reduction on the rotation, the gear secondary speed reducer 2 performs secondary speed reduction on the rotation, the two-time speed reduction and speed reduction ratio is high, and the output torque is large, so that an automobile engine which can be started only by large torque can be started smoothly.

The front cover 7 plays a role in installation, support and fixation in the whole structure, is installed on the engine through a bottom foot plane and a bottom foot hole of the front cover, is positioned through a pin shaft of the front cover, and is fastened on the engine through a fastening piece. Meanwhile, the electromagnetic switch 3 is fixed on the front cover through a screw hole and a bolt.

Example 2

In this embodiment, a further improvement is made on the basis of embodiment 1, as shown in fig. 1, the planetary primary speed reduction device 1 includes a planetary shaft 11, a plurality of planetary wheels 12, a reduction ring gear 13 and a mounting frame assembly 14; the planet shaft 11 is rotatably mounted on the mounting frame assembly 14, and the plurality of planet wheels 12 are rotatably mounted on the planet shaft 11 and positioned in the reduction gear ring 13 to be meshed with the reduction gear ring 13 and the armature gear of the armature 4.

In this embodiment, the primary planet gear speed reducer 1 is used for reducing the speed of the rotation output by the armature once, wherein the planet shaft 11 is used for transmitting the reduced rotation, the planet gear 12 and the speed reduction gear ring 13 are used for reducing the speed of the rotation output by the armature, and the mounting frame assembly 14 is used for mounting the planet shaft 11 and the speed reduction gear ring 13. As shown in fig. 3, three planetary gears 12 are provided, and the inner ends of the three planetary gears 12 are engaged with the armature gear of the armature, and the outer ends thereof are engaged with the reduction ring gear 13.

As shown in fig. 1, 3 and 4, the rear end of the planet shaft 11 is provided with a planet wheel mounting plate 111, and three planet wheel mounting columns 112 are arranged on the planet wheel mounting plate 111 for mounting three planet wheels 12. The planet shaft 11 is provided with a positioning retainer ring 15 for limiting the rear end position of the one-way clutch 21, and a reduction gear ring adjusting pad 16 for adjusting the axial position of the reduction gear ring 13 on the planet shaft 11.

Example 3

This embodiment is further improved on the basis of embodiment 2, and as shown in fig. 1, 5 to 9, the gear two-stage reduction gear 2 includes a one-way clutch 21, a drive gear 22, a drive shaft 23, a drive gear shift fork 24, and a one-way clutch shift fork 25.

The one-way clutch 21 is slidably mounted on the planet shaft 11, and the one-way clutch 21 is provided with a one-way clutch gear 211; the drive gear 22 is slidably mounted on the drive shaft 23 and engaged with the one-way clutch gear 211, and the outer diameter of the drive gear 22 is larger than that of the one-way clutch gear 211; one end of a driving gear shifting fork 24 is connected with the isolator 21, and the other end is connected with the driving gear 22; one end of the isolator shifting fork 25 is movably connected with the output end of the electromagnetic switch 3, and the other end is movably connected with the isolator 21 and drives the isolator 21 and the driving gear 22 to synchronously move, so that the driving gear 22 is meshed with or separated from a flywheel of an engine.

In this embodiment, the gear secondary speed reducer 2 is used to reduce the speed of the rotation output by the armature for the second time to output a large torque, so as to start the automobile engine. Wherein the one-way clutch 21 and the driving gear 22 are used to transmit the rotation while slowing down the rotation. Specifically, as shown in fig. 5, the one-way gear 211 of the one-way clutch 21 is a pinion gear, and the drive gear 22 is a bull gear, so that both can decelerate the rotation. The driving shaft 23 is used for mounting the driving gear 22, the driving gear shift fork 24 is used for enabling the isolator 21 and the driving gear 22 to advance and retreat together, and the isolator shift fork 25 is used for controlling the isolator 21 and the driving gear 22 to advance and retreat together, so that the driving gear 22 is meshed with or separated from a flywheel of an engine.

The double reduction mechanism of the present embodiment is supported and fixed in the starter mainly by the mounting bracket assembly 14, the planetary shaft 11 and the drive shaft 23. The first-stage speed reduction is realized by the armature gear of the armature and the internal teeth of the speed reduction gear ring 13 through the planet wheel 12 and the planet shaft 11, and the first-stage speed reduction ratio of the embodiment is 3.08. The two-stage speed reduction is completed by meshing the one-way gear 211 with the driving gear 22, and the speed reduction ratio of the two-stage speed reduction mechanism is 1.73, so that the speed reduction ratio of the double-speed reduction mechanism is 5.33, which is quite large, and the output torque is correspondingly large.

As shown in fig. 1 and 6, the isolator 21 is a through cylinder, the front end of the planet shaft 11 passes through the isolator 21, the isolator gear 211 is arranged at the front end of the isolator 21, the middle part of the outer wall of the isolator 21 is provided with a driving gear fork upper clamping groove 212 for mounting the driving gear fork 24, and the rear end of the outer wall of the isolator 21 is provided with an isolator fork hinge interface 213 for mounting the isolator fork 25.

As shown in fig. 1 and 7, the driving gear 22 is located below the one-way clutch 21, and a driving gear fork lower clamping groove 221 for mounting the driving gear fork 24 is provided on the driving gear 22.

As shown in fig. 1 and 8, the upper portion of the driving gear fork 24 is opened with a driving gear fork upper jaw 241 fitted to the driving gear fork upper jaw 212, and the lower portion thereof is opened with a driving gear fork lower jaw 242 fitted to the driving gear fork lower jaw 221. The driving gear fork upper jaw 241 and the driving gear fork lower jaw 242 are respectively connected to the driving gear fork upper jaw 212 and the driving gear fork lower jaw 221 so that the isolator 21 and the driving gear 22 synchronously move to advance and retreat together.

As shown in fig. 1 and 9, the isolator shift fork 25 is provided at an upper portion thereof with an isolator shift fork upper opening 251, at a middle portion thereof with a rotation fulcrum 252, and at a lower portion thereof with an isolator shift fork lower nip 253. The upper opening 251 of the isolator shift fork is connected with the output end of the electromagnetic switch 3, and the isolator shift fork 25 is controlled by the electromagnetic switch 3 to rotate around a rotating fulcrum 252, so that the isolator 21 connected with the lower clamping opening 253 of the isolator shift fork moves back and forth.

As shown in fig. 1, a retaining sleeve 201 is provided between the outer wall of the front end of the one-way clutch 21 and the front cover 7, and a wire retainer 202 clamped on the side wall of the one-way clutch 21 is provided in the retaining sleeve 201. The retaining sleeve 201 and the wire collar 202 are used for limiting the position of the front end of the one-way device 21, specifically, the retaining sleeve 201 is in contact with the front cover 7, the front cover 7 limits the forward movement of the retaining sleeve 201, and the retaining sleeve 201 limits the position of the front end of the one-way device 21 through the wire collar 202.

As shown in fig. 1 and 2, a flat milling platform 231 for radially stopping rotation of the driving shaft 23 is arranged at the front end of the driving shaft 23, and a positioning rotation stopping pin 203 is clamped on the flat milling platform 231; when the radial rotation stop of the drive shaft 23 is required, the rotation stop pin 203 is engaged with the mill flattening table 231 to radially stop the rotation of the drive shaft 23.

As shown in fig. 1, the rear end of the drive shaft 23 is provided with a shaft collar 204 and is sleeved with a compression spring 205, and the compression spring 205 is located between the shaft collar 204 and the front cover 7. The two ends of the driving shaft 23 are fixed on the starter front cover in a hole-shaft assembly mode, and the total length of the driving shaft 23 is larger than the distance between the end faces of the two matching holes, so that the shaft is firstly installed at one end with the compression spring 28 when being assembled, the spring can be installed after being compressed, the other end of the driving shaft can be installed after being compressed, and the driving shaft 23 is fixed at a proper axial position through the resilience of the spring. The shaft collar 204 is used to axially position the drive shaft 23.

Example 4

The present embodiment is further improved on the basis of embodiment 3, and as shown in fig. 1, 10 to 16, the stator assembly 5 includes a stator housing 51, six positioning pieces 52, six auxiliary magnetic strips 53 and six magnetic tiles 54.

The stator housing 51 is cylindrical, and a positioning sheet limiting boss 511 for axially limiting the position of the positioning sheet 52 and a positioning sheet positioning boss 512 for axially and radially fixing the position of the positioning sheet 52 are arranged in the stator housing 51; the positioning plate 52 is provided with a positioning plate positioning boss hole 521 adapted to the positioning plate positioning boss 512.

Six positioning pieces 52 are arranged in the stator housing 51 along the circumferential direction of the stator housing 51, the auxiliary magnetic strips 53 are arranged on the six positioning pieces 52, the magnetic shoes 54 are arranged between two adjacent positioning pieces 52, and armature installation cavities 55 are formed on the inner sides of the auxiliary magnetic strips 53 and the magnetic shoes 54 and used for installing the armatures 4.

In this embodiment, the stator housing 51 is a housing of the stator assembly 5; the positioning sheet 52 is used for installing an auxiliary magnetic strip 53 and a magnetic tile 54; the auxiliary magnetic strip 53 is used for assisting, supplementing and reinforcing the main magnetic field generated by the magnetic shoe 54; the magnetic shoe 54 is a key stator component and is a magnetic field source of the starter. In the embodiment, the positioning sheet limiting boss 511 is arranged in the stator casing 51 so as to limit the position of the positioning sheet 52 in the axial direction; the positioning plate 52 is fixed in the axial and radial directions by providing the positioning plate positioning boss 512 in the stator housing 51 and by being caught in the positioning plate positioning boss hole 521 of the positioning plate 52.

As shown in fig. 10, an adhesive layer 56 is disposed between the positioning sheet 52 and the inner side wall of the stator housing 51 for adhering the positioning sheet 52, and the adhesive layer 56 in this embodiment is an AB glue layer.

As shown in fig. 11 and 13-15, the positioning plate 52 is provided with an auxiliary magnetic stripe support bar 522, an auxiliary magnetic stripe positioning bar 523, a magnetic tile radial fixing bar 524 and a magnetic tile axial clamping bar 525, the positioning plate 52 is made of stainless steel, and the stainless steel has the functions of rust prevention and magnetic isolation to block the magnetic leakage flux between the magnetic tiles.

The auxiliary magnetic stripe supporting bar 522 is used for supporting the auxiliary magnetic stripe 53, the auxiliary magnetic stripe positioning bar 523 can be bent, and the magnetic stripe is sealed after bending to prevent the auxiliary magnetic stripe 53 from moving. Supplementary magnetic stripe location strip 523 is U type structure (before not buckling), and the back of buckling, the board card goes into supplementary magnetic stripe 53 along axial front and back both ends about its U type structure, and the supplementary magnetic stripe 53 axial displacement is sealed to the bottom plate of U type structure, makes supplementary magnetic stripe 53 be located between the bottom plate of U type structure and supplementary magnetic stripe support bar 522, prevents its radial movement.

The magnetic shoe radial fixing strips 524 are positioned at the left end and the right end of the positioning sheet 52 and are used for fixing the radial position of the magnetic shoe 54; the magnetic shoe axial locking strips 525 are located at the front and rear ends of the positioning plate 52 and are used for locking the magnetic shoe 54 in the axial direction.

As shown in fig. 10 and 12, a stator assembly positioning boss 513 is disposed on an outer wall of the stator housing 51, and the stator assembly positioning boss 513 is configured to cooperate with a front cover positioning notch of the starter to determine a relative position of the permanent magnet stator assembly in the front cover and the complete machine; a gap 514 is arranged on the side wall of the rear end of the stator shell 51 and used for clamping a lead-out wire protecting sleeve on the starter brush holder assembly.

As shown in fig. 10 and 16, the magnetic shoe 54 is made of ferrite, and the magnetizing direction is radial; the auxiliary magnetic strips 53 are made of ferrite, the magnetizing direction is in a lateral direction, and the auxiliary magnetic strips play a role in assisting, supplementing and strengthening a main magnetic field generated by the magnetic tiles.

Example 5

In this embodiment, a further improvement is made on the basis of embodiment 4, and as shown in fig. 17, a brush holder assembly 6 includes a brush holder 61, and a wire sheath 62, a positive carbon brush 63, and a negative carbon brush 64 mounted on the brush holder 61. The wire sheath 62 protects the circuit, and the positive carbon brush 63 and the negative carbon brush 64 allow current to flow therethrough.

In this embodiment, the brush holder assembly 6 and the rear cover 8 are fastened by screws, the radial position is aligned and matched with each other by the gap on the rear cover and the corresponding gap 514 on the stator casing through the wire sheath 62 of the outgoing line of the brush holder assembly, and the rear cover and the front cover are fastened together by assembling bolts. The relative position between the carbon brush on the brush holder assembly and the stator magnetic shoe is determined by the relative position of the brush holder assembly on the rear cover.

For a better understanding of the present invention, the following is a complete description of the working principle of the present invention:

when the engine is started, the electromagnetic switch 3 controls the one-way device shifting fork 25 to rotate around the rotating fulcrum 252, so that the one-way device 21 connected with the lower clamping opening 253 of the one-way device shifting fork moves forwards on the planet shaft 11, and the one-way device 21 drives the driving gear 22 to synchronously move forwards on the driving shaft 23 through the driving gear shifting fork 24, so that the driving gear 22 is meshed with a flywheel of the engine.

Meanwhile, the electromagnetic switch 3 controls the current to be transmitted to the anode carbon brush 63 of the brush holder assembly 6, then to the armature commutator and the armature coil of the armature 4, then to the cathode carbon brush 64 of the brush holder assembly 6, then to the brush holder bottom plate, and then to the rear cover 8 to form a passage, and the current in the armature 4 generates torque under the action of the stator magnetic field. The armature 4 drives the planet wheel 12 to rotate in the speed reduction gear ring 13 through the armature gear, and drives the planet shaft 11 to rotate, so that the rotation output by the armature is subjected to primary speed reduction; the planet shaft 11 drives the one-way clutch 21 to rotate, the one-way clutch gear 211 of the one-way clutch 21 drives the driving gear 22 to rotate, the rotation output by the armature is decelerated for the second time, and finally the driving gear 22 drives the flywheel of the engine to rotate, so that the starting of the automobile engine is realized.

After the engine is started, the electromagnetic switch 3 controls the one-way clutch shift fork 25 to rotate in the opposite direction, so that the driving gear 22 retreats and is separated from the flywheel of the engine, and simultaneously controls the armature to stop rotating, so that the driving gear 22 stops rotating.

When assembling the stator assembly 5, firstly, the bottom surface of the positioning sheet 52 is uniformly coated with the AB glue, and then the positioning sheet positioning boss holes 521 are aligned with the two positioning sheet positioning bosses 512 on the stator housing 51 and clamped into the positioning sheet positioning bosses, so that the positioning sheets 52 are uniformly adhered to the inner end surface of the stator housing 51, and all the positioning sheets 52 are assembled in sequence.

Then, with the positioning plate 52 at the notch 514 on the stator housing 51 as a reference, the auxiliary magnetic stripe 53 is installed on the auxiliary magnetic stripe support bar 522 in the positioning plate 52 according to the polarity, the complete auxiliary magnetic stripe 53 is sequentially assembled, whether each polarity is correct is checked according to fig. 10, and then the auxiliary magnetic stripe positioning bar 523 on the positioning plate 52 is bent to seal the auxiliary magnetic stripe 53.

Secondly, by taking the notch 514 on the stator shell 51 as a reference, the first magnetic shoe 54 is assembled, note that the magnetic shoe 54 is an N pole (the inner hole of the magnetic shoe is an N pole), the magnetic shoe 54 is pressed between the two positioning sheets 52 and tightly attached to the radial magnetic shoe fixing strips 524 of the positioning sheets 52, a certain pressure is required during pressing, because a part of the width between the two radial magnetic shoe fixing strips 524 is smaller than the width of the magnetic shoe 54, the width of the magnetic shoe 54 is only enough by deforming the two elastic radial magnetic shoe fixing strips 524 to widen the distance, and only by this way, the magnetic shoe 54 can be clamped and fixed on the stator in the radial direction, then the second magnetic shoe 54 is assembled, the polarity is opposite to that of the first magnetic shoe 54, and by this way, all the magnetic shoes 54 are assembled, and the axial magnetic shoe clamping strips 525 of the positioning sheets 52 are clamped on the end surface of the magnetic shoe 54.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and the equivalents or substitutions are included in the scope of the present invention defined by the claims.

Claims (10)

1. The utility model provides a double reduction starter for automobile engine which characterized in that: the device comprises a planet wheel primary speed reducer (1), a gear secondary speed reducer (2), an electromagnetic switch (3), an armature (4), a stator assembly (5), a brush carrier assembly (6), a front cover (7) and a rear cover (8);

the planet wheel primary speed reducing device (1) is connected with the gear secondary speed reducing device (2), and the planet wheel primary speed reducing device (1) and the gear secondary speed reducing device (2) are both positioned in the front cover (7); the electromagnetic switch (3) is arranged on the front cover (7) and connected with the gear secondary speed reducer (2) to control the gear secondary speed reducer (2) to move forwards or backwards, so that the gear secondary speed reducer (2) is meshed with or separated from a flywheel of an engine; the armature (4) is positioned in the stator assembly (5), is connected with the planet wheel primary speed reducer (1) and drives the planet wheel primary speed reducer (1) to rotate; the stator assembly (5) is arranged between the front cover (7) and the rear cover (8); the brush holder assembly (6) is positioned at the rear ends of the armature (4) and the stator assembly (5), and the rear cover (8) covers the rear end of the brush holder assembly (6);

the stator assembly (5) comprises a stator shell (51), a plurality of positioning sheets (52), a plurality of auxiliary magnetic strips (53) and a plurality of magnetic shoes (54); the magnetic bearing is characterized in that the plurality of positioning pieces (52) are arranged in the stator shell (51) along the circumferential direction of the stator shell (51), the auxiliary magnetic strips (53) are arranged on the plurality of positioning pieces (52), the magnetic shoes (54) are arranged between two adjacent positioning pieces (52), and armature installation cavities (55) are formed on the inner sides of the auxiliary magnetic strips (53) and the magnetic shoes (54).

2. The dual reduction starter of claim 1, wherein: the planet wheel primary speed reducing device (1) comprises a planet shaft (11), a plurality of planet wheels (12), a speed reducing gear ring (13) and a mounting rack assembly (14);

the planet shaft (11) is rotatably mounted on the mounting frame assembly (14), and the planet wheels (12) are rotatably mounted on the planet shaft (11), positioned in the speed reduction gear ring (13) and meshed with the speed reduction gear ring (13) and an armature gear of the armature (4).

3. The dual reduction starter of claim 2, wherein: a planet wheel mounting plate (111) is arranged at the rear end of the planet shaft (11), and a plurality of planet wheel mounting columns (112) are arranged on the planet wheel mounting plate (111); and the planet shaft (11) is provided with a positioning retainer ring (15) for limiting the rear end position of the one-way device (21) and a speed reduction gear ring adjusting pad (16) for adjusting the axial position of the speed reduction gear ring (13) on the planet shaft (11).

4. The dual reduction starter of claim 2, wherein: the gear two-stage speed reduction device (2) comprises a one-way device (21), a driving gear (22), a driving shaft (23), a driving gear shifting fork (24) and a one-way device shifting fork (25);

the one-way clutch (21) is slidably mounted on the planet shaft (11), and a one-way clutch gear (211) is arranged on the one-way clutch (21); the driving gear (22) is slidably mounted on the driving shaft (23) and meshed with the one-way gear (211), and the outer diameter of the driving gear (22) is larger than that of the one-way gear (211); one end of the driving gear shifting fork (24) is connected with the one-way device (21), and the other end of the driving gear shifting fork is connected with the driving gear (22); one end of the isolator shifting fork (25) is movably connected with the output end of the electromagnetic switch (3), the other end of the isolator shifting fork is movably connected with the isolator (21) and drives the isolator (21) and the driving gear (22) to synchronously move, so that the driving gear (22) is meshed with or separated from a flywheel of an engine.

5. The dual reduction starter of claim 4, wherein: the isolator (21) is in a penetrating cylindrical shape, the front end of the planet shaft (11) penetrates through the isolator (21), the isolator gear (211) is arranged at the front end of the isolator (21), the middle of the outer wall of the isolator (21) is provided with a driving gear shifting fork upper clamping groove (212), and the rear end of the outer wall of the isolator (21) is provided with an isolator shifting fork hinge joint (213);

the driving gear (22) is positioned below the isolator (21), and a driving gear shifting fork lower clamping groove (221) is formed in the driving gear (22);

the upper part of the driving gear shifting fork (24) is provided with a driving gear shifting fork upper clamping opening (241) matched with the driving gear shifting fork upper clamping groove (212), and the lower part of the driving gear shifting fork upper clamping opening is provided with a driving gear shifting fork lower clamping opening (242) matched with the driving gear shifting fork lower clamping groove (221);

the upper part of the isolator shifting fork (25) is provided with an isolator shifting fork upper opening (251), the middle part is provided with a rotating fulcrum (252), and the lower part is provided with an isolator shifting fork lower clamping opening (253).

6. The dual reduction starter of claim 4, wherein: a blocking sleeve (201) is arranged between the outer wall of the front end of the one-way device (21) and the front cover (7), and a steel wire clamping ring (202) clamped on the side wall of the one-way device (21) is arranged in the blocking sleeve (201);

the front end of the driving shaft (23) is provided with a flat milling platform (231) for radially stopping rotation of the driving shaft (23), and a positioning rotation stopping pin (203) is clamped on the flat milling platform (231); the rear end of the driving shaft (23) is provided with a shaft collar (204) and sleeved with a compression spring (205), and the compression spring (205) is positioned between the shaft collar (204) and the front cover (7).

7. The dual reduction starter of claim 1, wherein: the stator shell (51) is cylindrical, and a positioning plate limiting boss (511) for axially limiting the position of the positioning plate (52) and a positioning plate positioning boss (512) for axially and radially fixing the position of the positioning plate (52) are arranged in the stator shell (51); the positioning piece (52) is provided with a positioning piece positioning boss hole (521) matched with the positioning piece positioning boss (512).

8. The dual reduction starter of claim 7, wherein: the utility model discloses a stator casing, including stator casing (51), spacer (52) and stator casing, be provided with adhesive linkage (56) between stator casing (51) inside wall, be provided with supplementary magnetic stripe support bar (522), supplementary magnetic stripe location strip (523), the radial fixed strip of magnetic shoe (524) and magnetic shoe axial screens strip (525) on spacer (52), the material of spacer (52) is the stainless steel.

9. The dual reduction starter of claim 7, wherein: a stator assembly positioning boss (513) is arranged on the outer wall of the stator casing (51), and a notch (514) is formed in the side wall of the rear end of the stator casing (51); the auxiliary magnetic strip (53) is made of ferrite, and the magnetizing direction is in a lateral direction; the magnetic shoe (54) is made of ferrite, and the magnetizing direction is radial.

10. The dual reduction starter of claim 1, wherein: the brush holder assembly (6) comprises a brush holder (61), and a wire protecting sleeve (62), a positive carbon brush (63) and a negative carbon brush (64) which are arranged on the brush holder (61).

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