CN211082109U - Electric excitation planetary reduction starter - Google Patents

Abstract

The utility model discloses an electricity excitation planet speed reduction starter relates to starter technical field. In this application isolator assembly, use the speed reduction ring gear as the main part, the protecgulum carries out interference fit with the protecgulum tang with the rib diameter on the speed reduction ring gear excircle with the cooperation of isolator assembly, the stator also relies on the rib external diameter on the speed reduction ring gear excircle to carry out interference fit with the casing tang with the cooperation of isolator assembly, through this kind of cooperation, the protecgulum, the isolator assembly, the stator links together, the retaining ring of this application, spacer and rand cooperation are used, the removal scope of isolator has been injectd, prevent that the isolator from removing overload, cause the influence to the protecgulum, and through round pin axle and armature fixed connection on the shift fork, and the cooperation of shift fork lower extreme and isolator, the collision of isolator with other parts has been avoided. This application novel structure, the noise is little, can effectively prevent to mill the tooth, prolongs the life of starter.

Description

Electric excitation planetary reduction starter

Technical Field

The utility model relates to a starter technical field, more specifically say and relate to an electricity excitation planet speed reduction starter.

Background

It is known that starting an engine requires support from external forces, and that automobile starters play this role. In general, the starter uses three components to accomplish the entire starting process. The DC series motor introduces current from the storage battery and makes a driving gear of the starter generate mechanical motion; the transmission mechanism enables the driving gear to be meshed into the flywheel gear ring and can automatically disengage after the engine is started; the on-off of the starter circuit is controlled by an electromagnetic switch.

At present, the starting of an automobile engine is realized through external force, and a common starting mode is starting through an automobile starter. The existing automobile starter includes: the moving contact and the static contact connected with the battery can be conducted by the movement of the movable iron core, the armature is electrified, and the armature drives the driving gear to rotate, so that the automobile engine is started. The electromagnetic switch is a control switch on the automobile starter, is one of three main parts of the starter, is used for pushing out the driving gear to be meshed with the flywheel gear ring, and has the function of switching. When the static contact and the moving contact of the electromagnetic switch are closed, the main circuit of the starter is switched on, so that the armature of the starter rotates.

In the prior art, a chinese utility model patent document with an authorization announcement of CN207830023U and an authorization publication date of 09 and 07 in 2018 is proposed, and the technical scheme disclosed by the patent document is as follows: a permanent magnet automobile starter relates to the technical field of automobile starters. The utility model discloses a B terminal, M terminal, electromagnetic switch, armature assembly, brush yoke assembly and drive assembly, electromagnetic switch includes solenoid and movable core, movable core's axis and the axis coincidence of B terminal, movable core one end is provided with the rotating ring, and the other end is provided with armature, movable core drives rotating ring and armature along its axial reciprocating motion, and the bottom setting of M terminal and B terminal is in the coplanar, links to each other M terminal and B terminal through the rotating ring; and the M terminal is connected with the carbon brush of the brush holder assembly through a connecting wire.

In the actual use process, the following problems can occur in the technical scheme:

(1) the isolator cannot be limited, and in the moving process, when the isolator extends out or accidentally exceeds the tolerance, the front cover is easily pushed or milled, so that the isolator is damaged, and the service life is influenced.

(2) In the process that the shifting fork pushes the isolator to move, no buffer exists, the isolator can directly collide with other parts of the starter, and the service life is influenced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects and shortcomings in the prior art, the invention provides an electric excitation planet speed reduction starter, and aims to solve the problems that an isolator cannot be positioned when extending out and the buffer problem between a shifting fork and the isolator in the prior art. This application novel structure, the noise is little, can effectively prevent to mill the tooth, prolongs the life of starter.

In order to solve the problems existing in the prior art, the method is realized by the following technical scheme:

an electric excitation planet deceleration starter comprises a front cover, an isolator assembly, a shifting fork, an electromagnetic switch, a stator assembly, an armature assembly, a brush carrier assembly and a rear cover; the electromagnetic switch comprises a main body, an armature, a return spring and a pin shaft, and the stator assembly comprises a shell, a magnetic pole, a stator coil, a magnetic pole screw and a stator carbon brush; the method is characterized in that: the one-way clutch assembly comprises a check ring, a blocking sleeve, a planet shaft, a one-way clutch, a clamping ring and a speed reduction gear ring, ribs which are in interference fit with a front cover spigot and a shell spigot are arranged on the outer circle of the speed reduction gear ring, a positioning boss is further arranged on the speed reduction gear ring, and a groove which is matched with the positioning boss is arranged on the spigot surface of the front cover; the front cover and the shell press the speed reduction gear ring and are fixed together through a fastener; the brush frame bottom plate of the brush frame assembly is provided with at least two positioning holes, the seam allowance of the rear cover is provided with a boss corresponding to the positioning holes, the positioning holes are sleeved on the boss, and after the shell of the stator and the rear cover are assembled and fastened, the brush frame assembly is fixed between the rear cover and the stator; a pin shaft groove is formed in one end, connected with the armature, of the shifting fork, and a pin shaft is installed in the pin shaft groove to fixedly install one end of the shifting fork and the armature together; a shifting fork boss is arranged in the middle of the shifting fork, the shifting fork boss on the shifting fork is hinged in the front cover, and the other end of the shifting fork is matched with the isolator; one end of the planet shaft is provided with a groove for installing a check ring, and the check ring is installed in the groove to fix the blocking sleeve.

The planet gear mechanism is characterized in that a planet gear carrier is arranged at one end of the planet shaft, a plurality of planet gears are arranged on the planet gear carrier, the planet gears are riveted on the planet gear carrier through planet gear pins, the cross sections of the planet gear pins are T-shaped, and the planet gears rotate relative to the planet gear pins.

The planet shaft is provided with an isolator mounting part for mounting an isolator, and the isolator mounting part is provided with shaft teeth matched with the isolator.

The clamping ring is arranged at one end of the one-way device close to the planet wheel carrier.

The stator magnetic pole can be fixed through the magnetic pole screw, and the stator coil is fixed at the casing inner wall, just is located between two upper and lower magnetic poles.

The utility model discloses a theory of operation:

A12V direct current power supply is introduced through an S terminal of an electromagnetic switch, a pull-in coil and a maintaining coil of the electromagnetic switch are electrified in parallel to generate magnetic flux, the magnetic flux magnetizes an armature in the switch, the armature also becomes a magnet to generate a magnetic field, the magnetic field directions of the armature and the magnet are always attracted, as a result, the armature moves towards the S terminal of the switch, a shifting fork sleeved on the armature moves in the same direction, the other end of the shifting fork pushes an isolator to move towards a flywheel of an engine and is meshed with flywheel teeth through the action of a boss fulcrum of the shifting fork, a moving ring on the armature is contacted with a static ring on the switch to short circuit a switch coil, the current directions and the magnetic flux of the maintaining coil and the pull-in coil of the electromagnetic switch change to opposite directions to be mutually offset, and power supply voltage is applied to a circuit formed by connecting a stator and an armature coil in series, at the moment, the circuit resistance, the planetary shaft is driven to rotate, so that the one-way clutch is driven to rotate, the meshed engine flywheel is driven to rotate, and simultaneously, under the action of the switch return spring, the pushing teeth of the one-way clutch of the starter are meshed with the flywheel, so that the milled teeth are prevented, and the ignition starting of the engine is realized.

Compared with the prior art, the beneficial technical effects brought by the application are shown in that:

1. the one-way assembly is characterized in that a speed reduction gear ring is taken as a main body, a planet shaft is arranged in the speed reduction gear ring, a planet wheel is fixed on a planet carrier and forms a meshing relationship with an inner gear ring of the planet wheel, a front cover and the one-way assembly are matched through interference fit with a front cover spigot according to the diameter of a rib on the excircle of the speed reduction gear ring being Ø B, a stator and the one-way assembly are also matched through interference fit with a shell spigot according to the outer diameter of a rib on the excircle of the speed reduction gear ring being Ø A, the special fit is achieved.

2. The utility model discloses a 12V 1.8kW automobile starter, the structure is electric excitation planet speed reduction DC motor, is applicable to the many serial cars of faleo. The application of the retainer ring, the retainer sleeve and the retainer ring is matched for use, the moving range of the isolator is limited, the isolator is prevented from moving and overloading, the front cover is influenced, and the collision of the isolator and other parts is avoided through the pin shaft on the shifting fork and the fixed connection of the armature as well as the matching of the lower end of the shifting fork and the isolator.

3. The planet shaft is a core component of the motor, particularly a key component for transmitting torque, and the motor cannot work without the planet shaft. The specific working process is that armature shaft teeth on an armature rotating shaft are meshed with the planet wheel, the planet wheel is driven to rotate through armature output torque, meanwhile, the planet wheel is meshed with inner teeth of the speed reduction gear ring and rotates along inner teeth of the inner gear ring in accordance with armature steering, the planet wheel drives the planet shaft to rotate through the pin shaft, the planet shaft drives the isolator on the planet shaft to rotate, the isolator drives the engine flywheel to rotate, and ignition and starting of the automobile are achieved. In order to enable the one-way clutch to transmit enough torque to the engine flywheel, a speed reduction gear ring with the number of teeth much larger than that of the armature is arranged to form a proper speed reduction ratio, and enough torque is output.

4. Compared with the common planetary reduction mechanism, the planetary gear carrier is a composite planetary gear carrier, the planetary gear and the planetary shaft are riveted together through the T-shaped pin shaft, the fixation is firm, the falling is not easy, the motor works stably, the noise is low, and meanwhile, the transportation and the storage are easy, and the integral assembly of the motor is convenient; in the application, the special design of the pin shaft, the common planet speed reducing structure adopts the cylindrical pin, the planet wheel sleeve and the cylindrical pin are arranged in the motor assembly instead of riveting the planet wheel and the planet shaft together, and the open structure ensures that the planet wheel is easy to fall off from the planet shaft when the motor assembly, so that a cover plate is required to be added to cover the planet wheel, the cover plate is fixed firmly, otherwise, the planet wheel is still easy to fall off, the thickness of the cover plate is limited, and the motor is easy to deform due to impact when in work. Therefore, the material is consumed, the cost is increased, and the quality is difficult to ensure. The structure of the planet wheel carrier can well solve the problem.

Drawings

Fig. 1 is a schematic cross-sectional structural diagram of the starter of the present invention;

fig. 2 is a schematic structural view of the electromagnetic switch of the present invention;

FIG. 3 is a side view of the shifting fork of the present invention;

FIG. 4 is a front view of the fork of the present invention;

fig. 5 is a sectional view of the stator assembly of the present invention;

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

fig. 7 is a schematic structural view of the reduction gear ring of the present invention;

fig. 8 is a schematic structural view of the planet shaft of the present invention;

reference numerals: 1. front cover, 2, isolator assembly, 3, shift fork, 4, electromagnetic switch, 5, stator assembly, 6, armature assembly, 7, brush holder assembly, 8, rear cover, 9, main body, 10, armature, 11, return spring, 12, pin shaft, 13, casing, 14, magnetic pole, 15, stator coil, 16, magnetic pole screw, 17, stator carbon brush, 18, retainer ring, 19, retainer sleeve, 20, planet shaft, 21, isolator, 22, retainer ring, 23, reduction gear ring, 24, rib, 25, positioning boss, 26, pin shaft groove, 27, shift fork boss, 28, groove, 29, planet carrier, 30, planet wheel, 31, planet wheel pin shaft, 32, isolator mounting part, 33, shaft tooth.

Detailed Description

The technical scheme of the application is further elaborated in the following by combining the drawings in the specification.

Example 1

Referring to fig. 1-7 of the specification, this embodiment discloses:

an electric excitation planet deceleration starter comprises a front cover 1, a one-way clutch assembly 2, a shifting fork 3, an electromagnetic switch 4, a stator assembly 5, an armature assembly 6, a brush carrier assembly 7 and a rear cover 8; the electromagnetic switch 4 comprises a main body 9, an armature 10, a return spring 11 and a pin shaft 12, and the stator assembly 5 comprises a machine shell 13, a magnetic pole 14, a stator coil 15, a magnetic pole screw 16 and a stator carbon brush 17; the one-way clutch assembly 2 comprises a retainer ring 18, a retainer sleeve 19, a planet shaft 20, a one-way clutch 21, a retainer ring 22 and a speed reduction gear ring 23, wherein ribs 24 in interference fit with a front cover 1 spigot and a casing 13 spigot are arranged on the excircle of the speed reduction gear ring 23, a positioning boss 25 is also arranged on the speed reduction gear ring 23, and a groove matched with the positioning boss 25 is arranged on the spigot surface of the front cover 1; the front cover 1 and the machine shell 13 compress the speed reduction gear ring and are fixed together through a fastener; at least two positioning holes are formed in a brush frame bottom plate of the brush frame assembly 7, bosses corresponding to the positioning holes are arranged at the seam allowance of the rear cover 8, the positioning holes are sleeved on the bosses, and after a shell 13 of the stator is assembled and fastened with the rear cover 8, the brush frame assembly 7 is fixed between the rear cover 8 and the stator; a pin shaft groove 26 is formed in one end, connected with the armature 10, of the shifting fork 3, and a pin shaft 12 is installed in the pin shaft groove 26 to fixedly install one end of the shifting fork 3 and the armature 10 together; a shifting fork boss 27 is arranged in the middle of the shifting fork 3, the shifting fork boss 27 on the shifting fork 3 is hinged in the front cover 1, and the other end of the shifting fork 3 is matched with the isolator 21; one end of the planet shaft 20 is provided with a groove for installing the retainer ring 18, and the retainer ring 18 is installed in the groove to fix the retaining sleeve 19.

The working principle of the embodiment is as follows: A12V direct current power supply is introduced through a terminal S of an electromagnetic switch 4, a pull coil and a maintaining coil of the electromagnetic switch 4 are electrified in parallel to generate magnetic flux, the magnetic flux magnetizes an armature 10 in the switch, the armature 10 also becomes a magnet to generate a magnetic field, the magnetic field directions of the two are always attracted, as a result, the armature 10 moves towards the terminal S of the switch, a shifting fork 3 sleeved on the armature moves in the same direction, through the action of a fulcrum 27 of a boss 27 of the shifting fork, the other end of the shifting fork 3 pushes a one-way device 21 to move towards the flywheel direction of an engine and is meshed with the flywheel teeth, a moving ring on the armature 10 is contacted with a static ring on the switch at the moment to short-circuit a switch coil, the current directions and the magnetic fluxes of the maintaining coil and the pull coil of the electromagnetic switch 4 are changed into opposite directions to be mutually counteracted, a power supply voltage is applied to a line in, the gear teeth 33 are transmitted to the planet wheel 30 in the isolator 21 to drive the planet shaft 20 to rotate, so that the isolator 21 is driven to rotate, the meshed engine flywheel is driven to rotate, and simultaneously, under the action of the switch return spring 11, the pushing teeth of the starter isolator 21 are meshed with the flywheel to prevent the milled teeth and realize the ignition starting of the engine.

In the embodiment, in the isolator assembly 2, a speed reduction gear ring 23 is taken as a main body 9, a planet shaft 20 is arranged in the isolator assembly 2, a planet wheel 30 is fixed on the planet carrier and forms a meshing relation with an inner gear ring of the planet wheel 30, the front cover 1 is matched with the isolator assembly 2 by means of interference fit between ribs 24 with the diameter of Ø B on the excircle of the speed reduction gear ring 23 and a spigot of a casing 13, a stator is matched with the isolator assembly 2 by means of interference fit between ribs 24 with the outer diameter of Ø A on the excircle of the speed reduction gear ring 23 and the spigot of the casing 13, the special fit is adopted, the front cover 1, the isolator assembly 2 and the stator are connected together by the fit, in order to prevent relative rotation between the speed reduction gear ring 23 and the front cover 1 or the stator, a positioning boss 25 is designed on the speed reduction gear ring 23, two grooves are correspondingly designed on the spigot surface of the front cover 1 and matched with the same, the stator casing 13 and the front cover 1 are axially pressed and decelerated by the stator casing, the brush carrier assembly 7 is fixed into a whole by a novel axial fastening mode that the brush carrier assembly 7 is sleeved on a rear cover 8 and a rear shifting switch 8, a brush carrier 7 is designed by a novel axial bolt fastening mechanism which is not fixed on the casing by a shaft, and a shifting shaft 7, the shifting mechanism is designed to form a novel axial fastening mode that the axial direction of the axial switch, and a shifting fork assembly 7 and a shifting mechanism which is not by a shifting mechanism which is designed to form a unique axial bolt 12, and a unique axial switch, and a unique bolt assembly which is designed to form a unique bolt assembly which.

Example 2

As another preferred embodiment of the present invention, referring to fig. 1-8 of the specification, the present embodiment discloses:

an electric excitation planet deceleration starter comprises a front cover 1, a one-way clutch assembly 2, a shifting fork 3, an electromagnetic switch 4, a stator assembly 5, an armature assembly 6, a brush carrier assembly 7 and a rear cover 8; the electromagnetic switch 4 comprises a main body 9, an armature 10, a return spring 11 and a pin shaft 12, and the stator assembly 5 comprises a machine shell 13, a magnetic pole 14, a stator coil 15, a magnetic pole screw 16 and a stator carbon brush 17; the one-way clutch assembly 2 comprises a retainer ring 18, a retainer sleeve 19, a planet shaft 20, a one-way clutch 21, a retainer ring 22 and a speed reduction gear ring 23, wherein ribs 24 in interference fit with a front cover 1 spigot and a casing 13 spigot are arranged on the excircle of the speed reduction gear ring 23, a positioning boss 25 is also arranged on the speed reduction gear ring 23, and a groove matched with the positioning boss 25 is arranged on the spigot surface of the front cover 1; the front cover 1 and the machine shell 13 compress the speed reduction gear ring and are fixed together through a fastener; at least two positioning holes are formed in a brush frame bottom plate of the brush frame assembly 7, bosses corresponding to the positioning holes are arranged at the seam allowance of the rear cover 8, the positioning holes are sleeved on the bosses, and after a shell 13 of the stator is assembled and fastened with the rear cover 8, the brush frame assembly 7 is fixed between the rear cover 8 and the stator; a pin shaft groove 26 is formed in one end, connected with the armature 10, of the shifting fork 3, and a pin shaft 12 is installed in the pin shaft groove 26 to fixedly install one end of the shifting fork 3 and the armature 10 together; a shifting fork boss 27 is arranged in the middle of the shifting fork 3, the shifting fork boss 27 on the shifting fork 3 is hinged in the front cover 1, and the other end of the shifting fork 3 is matched with the isolator 21; one end of the planet shaft 20 is provided with a groove for installing the retainer ring 18, and the retainer ring 18 is installed in the groove to fix the retaining sleeve 19. A planet wheel carrier 29 is arranged at one end of the planet shaft 20, a plurality of planet wheels 30 are arranged on the planet wheel carrier 29, the planet wheels 30 are riveted on the planet wheel carrier 29 through planet wheel pins 31, the cross section of each planet wheel pin 31 is T-shaped, and the planet wheels 30 rotate relative to the planet wheel pins 31. The planet shaft 20 is provided with an isolator mounting part 32 for mounting the isolator 21, and the isolator mounting part 32 is provided with shaft teeth 33 matched with the isolator 21.

In the embodiment, the planet shaft 20 is a core component of the motor, especially a key component for transmitting torque, and the motor cannot work without the planet shaft 20. The specific working process is that armature shaft teeth 33 on an armature rotating shaft are meshed with the planet wheel 30, the planet wheel 30 is driven to rotate through armature output torque, meanwhile, the planet wheel 30 is meshed with the inner teeth of the reduction gear ring 23 and rotates along the inner teeth of the inner gear ring in accordance with the armature rotation direction, the planet wheel 30 drives the planet shaft 20 to rotate through the pin shaft 12, the planet shaft 20 drives the one-way clutch 21 on the planet shaft to rotate, the one-way clutch 21 drives the engine flywheel to rotate, and ignition and starting of the automobile are achieved. In order to transmit sufficient torque to the engine flywheel, the one-way clutch 21 is provided with a reduction ring gear 23 with a number of teeth much larger than that of the armature, so that a proper reduction ratio is formed, and sufficient torque is output.

Example 3

As another preferred embodiment of the present invention, referring to fig. 1-8 of the specification, the present embodiment discloses:

an electric excitation planet deceleration starter comprises a front cover 1, a one-way clutch assembly 2, a shifting fork 3, an electromagnetic switch 4, a stator assembly 5, an armature assembly 6, a brush carrier assembly 7 and a rear cover 8; the electromagnetic switch 4 comprises a main body 9, an armature 10, a return spring 11 and a pin shaft 12, and the stator assembly 5 comprises a machine shell 13, a magnetic pole 14, a stator coil 15, a magnetic pole screw 16 and a stator carbon brush 17; the one-way clutch assembly 2 comprises a retainer ring 18, a retainer sleeve 19, a planet shaft 20, a one-way clutch 21, a retainer ring 22 and a speed reduction gear ring 23, wherein ribs 24 in interference fit with a front cover 1 spigot and a casing 13 spigot are arranged on the excircle of the speed reduction gear ring 23, a positioning boss 25 is also arranged on the speed reduction gear ring 23, and a groove matched with the positioning boss 25 is arranged on the spigot surface of the front cover 1; the front cover 1 and the machine shell 13 compress the speed reduction gear ring and are fixed together through a fastener; at least two positioning holes are formed in a brush frame bottom plate of the brush frame assembly 7, bosses corresponding to the positioning holes are arranged at the seam allowance of the rear cover 8, the positioning holes are sleeved on the bosses, and after a shell 13 of the stator is assembled and fastened with the rear cover 8, the brush frame assembly 7 is fixed between the rear cover 8 and the stator; a pin shaft groove 26 is formed in one end, connected with the armature 10, of the shifting fork 3, and a pin shaft 12 is installed in the pin shaft groove 26 to fixedly install one end of the shifting fork 3 and the armature 10 together; a shifting fork boss 27 is arranged in the middle of the shifting fork 3, the shifting fork boss 27 on the shifting fork 3 is hinged in the front cover 1, and the other end of the shifting fork 3 is matched with the isolator 21; one end of the planet shaft 20 is provided with a groove for installing the retainer ring 18, and the retainer ring 18 is installed in the groove to fix the retaining sleeve 19.

A planet wheel carrier 29 is arranged at one end of the planet shaft 20, a plurality of planet wheels 30 are arranged on the planet wheel carrier 29, the planet wheels 30 are riveted on the planet wheel carrier 29 through planet wheel pins 31, the cross section of each planet wheel pin 31 is T-shaped, and the planet wheels 30 rotate relative to the planet wheel pins 31. The planet shaft 20 is provided with an isolator mounting part 32 for mounting the isolator 21, and the isolator mounting part 32 is provided with shaft teeth 33 matched with the isolator 21. The collar 22 is mounted on the one-way clutch 21 near one end of the planet carrier 29. The stator magnetic pole 14 can be fixed by a magnetic pole screw 16, and the stator coil 15 is fixed on the inner wall of the machine shell 13 and positioned between the upper magnetic pole 14 and the lower magnetic pole 14.

Claims (5)

1. An electric excitation planet deceleration starter comprises a front cover (1), a one-way device assembly (2), a shifting fork (3), an electromagnetic switch (4), a stator assembly (5), an armature assembly (6), a brush carrier assembly (7) and a rear cover (8); the electromagnetic switch (4) comprises a main body (9), an armature (10), a return spring (11) and a pin shaft (12), and the stator assembly (5) comprises a shell (13), a magnetic pole (14), a stator coil (15), a magnetic pole screw (16) and a stator carbon brush (17); the method is characterized in that: the one-way clutch assembly (2) comprises a retainer ring (18), a retainer sleeve (19), a planet shaft (20), a one-way clutch (21), a clamping ring (22) and a speed reduction gear ring (23), wherein ribs (24) in interference fit with a front cover (1) spigot and a casing (13) spigot are arranged on the excircle of the speed reduction gear ring (23), a positioning boss (25) is further arranged on the speed reduction gear ring (23), and a groove matched with the positioning boss (25) is arranged on the spigot surface of the front cover (1); the front cover (1) and the shell (13) are pressed against the speed reduction gear ring and fixed together through a fastener; at least two positioning holes are formed in a brush frame bottom plate of the brush frame assembly (7), bosses corresponding to the positioning holes are arranged at the seam allowance of the rear cover (8), the positioning holes are sleeved on the bosses, and after a shell (13) of the stator and the rear cover (8) are assembled and fastened, the brush frame assembly (7) is fixed between the rear cover (8) and the stator; a pin shaft groove (26) is formed in one end, connected with the armature (10), of the shifting fork (3), and a pin shaft (12) is installed in the pin shaft groove (26) to fixedly install one end of the shifting fork (3) and the armature (10) together; a shifting fork boss (27) is arranged in the middle of the shifting fork (3), the shifting fork boss (27) on the shifting fork (3) is hinged in the front cover (1), and the other end of the shifting fork (3) is matched with the one-way device (21); one end of the planet shaft (20) is provided with a groove (28) for installing the check ring (18), and the check ring (18) is installed in the groove (28) to fix the stop sleeve (19).

2. An electrically excited planetary reduction starter as claimed in claim 1, wherein: one end of the planet shaft (20) is provided with a planet wheel carrier (29), a plurality of planet wheels (30) are arranged on the planet wheel carrier (29), the planet wheels (30) are riveted on the planet wheel carrier (29) through planet wheel pin shafts (31), the cross section of each planet wheel pin shaft (31) is T-shaped, and the planet wheels (30) rotate relative to the planet wheel pin shafts (31).

3. An electrically excited planetary reduction starter as claimed in claim 1 or 2, wherein: the planet shaft (20) is provided with an isolator mounting part (32) of an isolator (21) for mounting, and the isolator mounting part (32) is provided with shaft teeth (33) matched with the isolator (21).

4. An electrically excited planetary reduction starter as claimed in claim 2, wherein: the clamping ring (22) is mounted at one end of the one-way clutch (21) close to the planet wheel carrier (29).

5. An electrically excited planetary reduction starter as claimed in claim 1, wherein: the magnetic poles (14) are fixed on the shell (13) through magnetic pole screws (16), and the stator coil (15) is fixed on the inner wall of the shell (13) and positioned between the upper magnetic pole and the lower magnetic pole (14).

Images