CN220890378U - Permanent magnet direct current planetary reduction automobile starter - Google Patents

Abstract

The utility model discloses a permanent magnet direct current planetary reduction automobile starter, which relates to the technical field of starters and comprises a isolator assembly, a front end cover, an electromagnetic switch, a shifting fork, a stator assembly, an armature, a brush holder assembly and a rear cover. The isolator assembly comprises an isolator and a planet shaft, the isolator is assembled on the planet shaft in a sliding mode, a blocking sleeve is assembled at the front end of the planet shaft, a first hole section is formed in the front end of the isolator, and when the shifting fork drives the isolator to move back and forth on the planet shaft, the blocking sleeve moves in the first hole section and is limited by the step face of the inner end of the first hole section. That is, the first hole section at the inner end of the isolator limits the moving stroke, and compared with the limiting mode in the prior art, the total length of the planetary shaft is reduced under the condition that the moving stroke is fixed, so that the volume of the starter can be reduced.

Description

Permanent magnet direct current planetary reduction automobile starter

Technical Field

The utility model relates to the technical field of starters, in particular to a permanent magnet direct current planetary reduction automobile starter.

Background

The starter is called a motor, which converts electric energy into mechanical energy to drive the flywheel of the engine to rotate so as to realize the starting of the engine. The starter is classified into a direct current starter, a gasoline starter, a compressed air starter, etc. according to the working principle. The internal combustion engine is mostly a direct current starter, and has the characteristics of compact structure, simple operation and convenient maintenance. Dc starters are specially designed to start the engine and require a high torque, so the amount of current to be passed is very large, reaching hundreds of amperes.

At present, the starting of an automobile engine is realized through external force, and a common starting mode is that a direct current starter is used for starting. In a dc starter, the rotation speed of an armature is high, the output torque of the armature is small, and in order to increase the output torque of the starter, a speed reducing mechanism is usually connected to the output end of the armature so that the starter outputs high torque.

In the prior art, the publication number is CN215761999U, a double-reduction starter for an automobile engine is disclosed, and relates to the technical field of automobile starters, and the double-reduction starter comprises a planetary gear primary reduction gear, a gear secondary reduction gear, an electromagnetic switch, an armature, a stator assembly, a brush holder assembly, a front cover and a rear cover; the planetary gear primary speed reducer is connected with the gear secondary speed reducer, and the planetary gear 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 two-stage speed reducer; the armature is positioned in the stator assembly and connected with the planetary gear primary speed reducer; the stator assembly is arranged between the front cover and the rear cover; the brush frame 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 frame assembly. The rotation output by the armature is decelerated twice, the deceleration ratio is high, and the output torque is large, so that the 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.

The double-reduction starter disclosed in the patent is characterized in that a retaining sleeve is arranged on the outer wall of the front end of the isolator, and a steel wire clamping ring clamped on the side wall of the isolator is arranged in the retaining sleeve. The retaining sleeve and the wire collar are used for limiting the position of the front end of the isolator.

When the isolator is positioned at the rightmost end, the distance between the left end face of the isolator and the retaining sleeve forms the moving stroke of the isolator, and under the condition of a certain moving stroke, the mode needs a longer planetary shaft, so that the whole volume of the starter is larger.

Disclosure of utility model

In order to overcome the defects in the prior art, the utility model aims to provide a permanent magnet direct current planetary reduction automobile starter so as to solve the problem that a longer planetary shaft is needed.

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

A permanent magnet direct current planetary reduction automobile starter comprises a isolator assembly, a front end cover, an electromagnetic switch, a shifting fork, a stator assembly, an armature, a brush carrier assembly and a rear cover;

The electromagnetic switch is assembled on the upper part of the rear end of the front end cover, and the stator assembly is assembled on the lower part of the rear end of the front end cover; the isolator assembly and the shifting fork are both positioned in the front end cover, the top end of the shifting fork is connected with the electromagnetic switch, and the bottom end of the shifting fork is connected with the isolator assembly; the armature is positioned in the stator assembly, the front end of the armature is connected with the isolator assembly, and the rear end of the armature is connected with the brush frame assembly; the brush holder assembly is positioned in the rear cover, and the rear cover is positioned behind the stator assembly;

The isolator assembly comprises an isolator and a planet shaft, the isolator is assembled on the planet shaft in a sliding mode, a blocking sleeve is assembled at the front end of the planet shaft, a first hole section is formed in the front end of the isolator, and when the shifting fork drives the isolator to move back and forth on the planet shaft, the blocking sleeve moves in the first hole section and is limited by the step face of the inner end of the first hole section.

Preferably, the isolator assembly further comprises a planetary gear and a reduction gear ring;

A shifting fork mounting groove is formed in the outer side wall of the rear end of the isolator, a through planetary shaft mounting hole is formed in the length direction of the shifting fork mounting groove, the front section of the planetary shaft mounting hole comprises a first hole section and a second hole section which are coaxial, the inner diameter of the first hole section is larger than that of the second hole section, and a step surface is formed at the joint of the first hole section and the second hole section;

The planetary shaft passes through the planetary shaft mounting hole and is in sliding fit with the planetary shaft mounting hole, a plurality of planetary gears are arranged and are assembled at the rear end of the planetary shaft, and the reduction gear ring is sleeved on the plurality of planetary gears and meshed with the planetary gears;

The planet axle front end's lateral wall is provided with the rand mounting groove, be equipped with the rand on the rand mounting groove, be equipped with the fender cover on the rand, when shifting fork drive isolator back and forth movement on the planet axle, the fender cover is in remove in the first hole section and by the ladder facing removal of first hole section inner restriction.

Preferably, the isolator comprises a first unidirectional section at the front part and a second unidirectional section at the rear part, the first unidirectional section and the second unidirectional section are in running fit through rollers, the first hole section and the second hole section are positioned in the first unidirectional section, and the shifting fork mounting groove is positioned on the outer side wall of the second unidirectional section;

the front part of the second hole section is provided with an oil-containing bearing, and the side wall of the rear part is provided with a spline mounting groove.

Preferably, a spline matched with the spline mounting groove is arranged on the side wall of the planet shaft; the rear end of the planetary shaft is provided with a mounting disc, and a plurality of intermediate shafts for mounting the planetary gears are arranged on the mounting disc.

Preferably, the speed reduction gear ring is provided with a radial positioning boss and a piece passing notch, and the speed reduction gear ring is a multi-internal tooth plastic piece.

Preferably, a deep groove ball bearing is arranged on the outer side wall of the middle part of the isolator, and a driving gear is arranged on the outer side wall of the front end.

Preferably, the front end cover is an aluminum casting, and the front end of the front end cover is provided with a mounting spigot.

Preferably, the armature has a wave winding coil structure.

Preferably, the armature comprises 25 coils.

Preferably, the 25 coils form two parallel circuits.

The utility model has the beneficial effects that:

According to the automobile starter provided by the utility model, the front end of the planetary shaft is provided with the retaining sleeve, the front end of the isolator is internally provided with the first hole section, and when the shifting fork drives the isolator to move forwards and backwards on the planetary shaft, the retaining sleeve moves in the first hole section and is limited by the movement of the step surface at the inner end of the first hole section. That is, the first hole section at the inner end of the isolator limits the moving stroke, and compared with the limiting mode in the prior art, the total length of the planetary shaft is reduced under the condition that the moving stroke is fixed, so that the volume of the starter can be reduced.

Drawings

FIG. 1 is a schematic diagram of a starter according to the present utility model;

FIG. 2 is a schematic view of a front end cap of the present utility model;

FIG. 3 is a schematic illustration of a isolator assembly of the present utility model;

FIG. 4 is a schematic view of a one-way clutch of the present utility model;

FIG. 5 is a schematic view of a planetary shaft of the present utility model;

FIG. 6 is a schematic view of a reduction gear ring of the present utility model;

FIG. 7 is a schematic view of a brush holder assembly according to the present utility model;

FIG. 8 is a view of the rear cover of the starter according to the present utility model;

fig. 9 is an enlarged view of fig. 8;

FIG. 10 is a view showing the position of the armature wire and carbon brush of the starter according to the present utility model;

FIG. 11 is a schematic diagram of the starter armature wiring of the present utility model;

Reference numerals:

1. A isolator assembly; 11. a one-way device; 111. a fork mounting groove; 112. a first bore section; 113. a second bore section; 114. a first unidirectional section; 115. a second unidirectional section; 116. a roller; 117. an oil-impregnated bearing; 118. a spline mounting groove; 12. a planetary shaft; 121. a collar mounting groove; 122. a spline; 123. a mounting plate; 124. an intermediate shaft; 13. a planetary gear; 14. a reduction gear ring; 141. radial positioning bosses; 142. a passing notch; 15. a collar; 16. a blocking sleeve; 17. deep groove ball bearings; 2. a front end cover; 21. installing a spigot; 3. an electromagnetic switch; 4. shifting fork; 5. a stator assembly; 6. an armature; 7. a brush holder assembly; 8. and a rear cover.

Detailed Description

The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model.

Example 1

A permanent magnet direct current planetary reduction automobile starter, as shown in figure 1, comprises a isolator assembly 1, a front end cover 2, an electromagnetic switch 3, a shifting fork 4, a stator assembly 5, an armature 6, a brush holder assembly 7 and a rear cover 8;

The electromagnetic switch 3 is assembled at the upper part of the rear end of the front end cover 2, and the stator assembly 5 is assembled at the lower part of the rear end of the front end cover 2; the isolator assembly 1 and the shifting fork 4 are both positioned in the front end cover 2, the top end of the shifting fork 4 is connected with the electromagnetic switch 3, and the bottom end is connected with the isolator assembly 1; the armature 6 is positioned in the stator assembly 5, the front end of the armature is connected with the isolator assembly 1, and the rear end of the armature is connected with the brush holder assembly 7; the brush holder assembly 7 is positioned in the rear cover 8, and the rear cover 8 is positioned behind the stator assembly 5;

As shown in fig. 3, the isolator assembly 1 comprises an isolator 11 and a planetary shaft 12, the isolator 11 is slidably assembled on the planetary shaft 12, a retaining sleeve 16 is assembled at the front end of the planetary shaft 12, a first hole section 112 is arranged in the front end of the isolator 11, and when the fork 4 drives the isolator 11 to move back and forth on the planetary shaft 12, the retaining sleeve 16 moves in the first hole section 112 and is limited by the movement of a step face at the inner end of the first hole section 112.

In this embodiment, the front end of the planet shaft 12 is equipped with a retaining sleeve 16, a first hole section 112 is provided in the front end of the isolator 11, and when the shift fork 4 drives the isolator 11 to move back and forth on the planet shaft 12, the retaining sleeve 16 moves in the first hole section 112 and is limited by the step face of the inner end of the first hole section 112. That is, the first hole section 112 at the inner end of the isolator 11 limits the moving stroke, and in case of a certain moving stroke, the total length of the planetary shaft of the present utility model will be reduced compared with the limiting mode in the prior art, so that the volume of the starter can be reduced.

The embodiment item relates to an automobile starter, the structure of the automobile starter is permanent magnet direct current planetary reduction, the electric voltage is generally designed to be 12V, and the power can cover 1.2-1.8kW series products. Widely used for ignition starting of motor vehicles such as Mitsubishi and Hitachi. The device has the characteristics of large output torque, high power, low failure rate, long service life and high cost performance.

As shown in fig. 1, 2 and 3, the front end cover 2 is an aluminum casting, is a foundation of an integral structure, and is provided with a spigot excircle of a spigot surface and a mounting hole which are matched and connected with a generator so as to fix the starter on an engine, a isolator assembly is assembled on a stator spigot surface of the starter, and a rear cover, the stator assembly and an electromagnetic switch are axially fixed through bolts. Compared with a common planetary reduction gear, the isolator assembly has the following characteristics: the limiting mode is different, the moving stroke of the planetary shaft is limited from the inner hole of the isolator through the installation of the steel wire clamping ring and the gear sleeve on the planetary shaft, and the total length of the planetary shaft is shortened.

Example 2

This embodiment is further described on the basis of embodiment 1, as shown in fig. 3-6, the isolator assembly 1 further includes a planetary gear 13 and a reduction gear ring 14;

The outer side wall of the rear end of the isolator 11 is provided with a shifting fork mounting groove 111, a through planetary shaft mounting hole is formed in the length direction of the shifting fork mounting groove, the front section of the planetary shaft mounting hole comprises a first hole section 112 and a second hole section 113 which are coaxial, the inner diameter of the first hole section 112 is larger than that of the second hole section 113, and a step surface is formed at the joint of the first hole section 112 and the second hole section 113;

The planetary shaft 12 passes through the planetary shaft mounting hole and is in sliding fit with the planetary shaft mounting hole, a plurality of planetary gears 13 are arranged and are assembled at the rear end of the planetary shaft 12, and a reduction gear ring 14 is sleeved on the plurality of planetary gears 13 and meshed with the planetary gears 13;

The outer side wall of the front end of the planet shaft 12 is provided with a clamping ring mounting groove 121, the clamping ring mounting groove 121 is provided with a clamping ring 15, the clamping ring 15 is provided with a retaining sleeve 16, and when the shifting fork 4 drives the isolator 11 to move back and forth on the planet shaft 12, the retaining sleeve 16 moves in the first hole section 112 and is limited by the step face of the inner end of the first hole section 112.

Specifically, when the shifting fork in the shifting fork mounting groove 111 drives the isolator 11 to move forward, the retaining sleeve 16 slides in the first hole section 112, and when the retaining sleeve 16 abuts against the step surface at the inner end of the first hole section 112, the isolator 11 is limited to move forward continuously; when the shifting fork in the shifting fork mounting groove 111 drives the isolator 11 to move backwards, the retaining sleeve 16 is far away from the stepped surface at the inner end of the first hole section 112, and when the rear end surface of the isolator 11 abuts against the reduction gear ring 14, the isolator 11 is limited to move backwards continuously. In fig. 3, the left end is the front, and the right end is the rear.

In the prior art, when the isolator is positioned at the rightmost end, the distance between the left end face of the isolator and the retaining sleeve forms the movement stroke of the isolator.

In this embodiment, when the isolator is located at the rightmost end, the distance between the stepped surface between the first hole section 112 and the second hole section 113 of the isolator 11 and the retainer 16 forms the movement stroke of the isolator. Under the condition that the length of the isolator and the moving stroke of the isolator are unchanged, the length of the planetary shaft matched with the isolator in the embodiment is smaller than that of the planetary shaft in the prior art, so that the volume of the starter can be integrally reduced.

According to the embodiment, the limit modes of the retaining sleeve are different, and the moving stroke of the retaining sleeve is limited from the inner hole of the isolator through the installation of the steel wire retainer ring and the retaining sleeve on the planetary shaft, so that the total length of the planetary shaft is shortened.

As shown in fig. 4, the isolator 11 comprises a front first unidirectional section 114 and a rear second unidirectional section 115, the first unidirectional section 114 and the second unidirectional section 115 are in running fit through a roller 116, the first hole section 112 and the second hole section 113 are positioned in the first unidirectional section 114, and the shifting fork mounting groove 111 is positioned on the outer side wall of the second unidirectional section 115; the second bore section 113 is fitted with an oil bearing 117 at the front and a spline mounting groove 118 on the side wall of the rear section. The deep groove ball bearing 117 is arranged on the outer side wall of the middle part of the isolator 11, and the reliability of torque transmission is improved. The outer side wall of the front end of the isolator 11 is provided with a driving gear.

In this embodiment, the isolator 11 is one of the core components and functions to transmit and output torque, transmitting torque through its internal spline, and outputting torque through its front drive gear.

As shown in fig. 5, the side wall of the planetary shaft 12 is provided with splines 122 which mate with the spline mounting grooves 118; the rear end of the planetary shaft 12 is provided with a mounting plate 123, and the mounting plate 123 is provided with a plurality of intermediate shafts 124 for mounting the planetary gears 13.

In this embodiment, the planetary shaft 12 is also one of the core components, and is structurally designed with a collar mounting groove 121, an external spline 122 matched with the isolator 11, and an intermediate shaft 124 in interference tight fit, which has the task of providing a slideway of the isolator 11, transmitting the torque from the armature, and implementing the driving of the engine flywheel to rotate to start the engine.

As shown in fig. 6, the speed reduction gear ring 14 is provided with a radial positioning boss 141 and a through piece notch 142, and the speed reduction gear ring 14 is a multi-internal tooth plastic piece.

In this embodiment, the reduction gear ring 14 is a multi-internal tooth plastic member, is mounted on the front cover of the starter, is designed with a boss positioned in the inner diameter of the end cover, and is provided with a through bolt passing notch, which is a support for the whole reduction gear and is a key part for realizing reduction. The planetary gear 13 is an intermediate part for realizing deceleration transmission and a transition part for transmitting torque, and does not change the rotation speed itself; the steel wire retainer ring 15 and the retaining sleeve 16 mainly serve to limit the sliding position of the isolator and prevent the isolator from sliding out of the planet axle 12 to damage other parts.

Example 3

The embodiment is further described on the basis of embodiment 2, as shown in fig. 1 and 7-11, the armature is characterized by adopting a wave winding coil structure, the relative positions of wiring and +/-carbon brushes on the outer circle of the armature commutator are shown in fig. 10, according to the graph, the direction of electromagnetic force applied to the armature coil under 6 pairs of magnetic poles can be judged by using a left hand rule, as shown by the electromagnetic force applied to F in the graph, the stress direction under each pole is the same, and the working direction of the driving teeth of the unidirectional device assembly seen from the front end of the starter is clockwise. The two pairs of +/-carbon brushes on the brush holder assembly (figure 7) divide the 25 coils of the armature into two parallel paths as shown in figure 11, wherein the coils 1 and 13 are respectively short-circuited by the + carbon brushes and the-carbon brushes, and the two parallel paths are changed into two parallel paths through the carbon brushes and the wave winding structure. In order to more clearly illustrate the internal structure and the rotating direction of the starter, a radial structure diagram of a cover after simulated sectioning is specially drawn, fig. 8 shows the relative radial positions of +/-carbon brush and N/S pole magnetic shoes of a stator in an actual product, two circles of inner circles of circles indicate the head and the tail of two coils on each piece of a commutator, two circles of outer circles of circles indicate the head and the tail of two coils in a punching slot, current is seen to flow from a carbon brush into the coils from +carbon brush into the coils, 6-slot coil current around the inner circle of the stator is all at a gap part in the middle of each magnetic shoe, the stress direction of the coils is judged to be perpendicular to the armature by a left hand rule, only radial moment is generated, tangential moment on the circumference cannot be generated basically, the armature cannot rotate, current in the 4 th coil starts to flow below the magnetic shoe, the generated moment is generated by the coil under each pole, the direction is consistent like the figure, the directions are all anticlockwise, and the direction is clockwise when the starter is seen from the front end, namely the working direction.

For a better understanding of the present utility model, the following is a complete description of the principles of the utility model:

The working process of the starter is different from that of other planetary reduction structure motors. When the automobile starts, the starting switch is turned on, the power supply is turned on, the switch B+ terminal and the electromagnetic switch S terminal are electrified, the current is arranged in the attraction coil and the maintenance coil of the two coils of the switch, the maintenance coil is directly grounded, a branch is independently formed, the tail end of the attraction coil is connected with the lead-out wire lug of the brush frame assembly and the end of the switch M, the brush frame assembly, the carbon brush and the reversing sheet are connected with the armature coil, the armature coil is connected with the carbon brush and grounded to form another branch, the switch attraction coil is connected in series with the branch, the resistance is very large relative to the armature coil, the current is very small, the torque generated on the armature coil is very small, the armature cannot rotate, but the two coils of the switch generate magnetic fields, the armature in the switch coil is magnetized, and magnetic fluxes opposite to the magnetic fields of the switch coil are also generated, the armature moves towards the direction B+ and drives the shifting fork to move in the same direction, the other end of the shifting fork drives the isolator in the isolator assembly to move reversely to the flywheel of the engine and to be meshed in place, at the moment, the armature also drives the movable ring in the switch to move in place and short-circuits the B+ and M terminals, at the moment, the sucking coil of the switch is short-circuited, the circuit is changed, one path becomes an S-switch maintaining coil-grounding, the other path (B+) -M end-sucking coil-maintaining coil, the currents of the two coils are opposite and mutually offset, the magnetic field in the coil is basically disappeared, so that the armature is beneficial to retreating, the other path is a main circuit, (B+) -M end- + carbon brush-armature coil-carbon brush-grounding, because the branch is only provided with the carbon brush and the armature coil, the switch coil with large resistance is not provided, the resistance is very small, the current is very large, the armature generates very large torque, the intermediate gear is meshed with the intermediate gear in the isolator assembly through the shaft teeth, the intermediate gear is driven to rotate along the circumference of the inner gear ring in the isolator assembly, and meanwhile, the intermediate gear is sleeved on the planetary shaft of the isolator assembly, so that the planetary shaft is driven to rotate, the planetary shaft is connected with the isolator through the spline, the isolator meshed with the flywheel of the engine is driven to rotate, the flywheel is rotated, ignition starting of the engine is achieved, and the armature and the isolator are retracted by the return spring in the switch.

While the embodiments of the present utility model have been described in detail, the present utility model is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model, and these are intended to be included in the scope of the present utility model as defined in the appended claims.

Claims (10)

1. The permanent magnet direct current planetary reduction automobile starter is characterized by comprising a one-way clutch assembly (1), a front end cover (2), an electromagnetic switch (3), a shifting fork (4), a stator assembly (5), an armature (6), a brush carrier assembly (7) and a rear cover (8);

The electromagnetic switch (3) is assembled at the upper part of the rear end of the front end cover (2), and the stator assembly (5) is assembled at the lower part of the rear end of the front end cover (2); the isolator assembly (1) and the shifting fork (4) are both positioned in the front end cover (2), the top end of the shifting fork (4) is connected with the electromagnetic switch (3), and the bottom end of the shifting fork is connected with the isolator assembly (1); the armature (6) is positioned in the stator assembly (5), the front end of the armature is connected with the isolator assembly (1), and the rear end of the armature is connected with the brush holder assembly (7); the brush holder assembly (7) is positioned in the rear cover (8), and the rear cover (8) is positioned behind the stator assembly (5);

Isolator assembly (1) are including isolator (11) and planet axle (12), isolator (11) sliding fit is in on planet axle (12), the front end of planet axle (12) is equipped with fender cover (16), and isolator (11) front end inside is provided with first hole section (112), and when shifting fork (4) drive isolator (11) back and forth movement on planet axle (12), fender cover (16) are in first hole section (112) remove and are restricted by the ladder facing removal of first hole section (112) inner.

2. The vehicle starter according to claim 1, characterized in that the isolator assembly (1) further comprises a planetary gear (13) and a reduction gear ring (14);

A shifting fork mounting groove (111) is formed in the outer side wall of the rear end of the isolator (11), a through planetary shaft mounting hole is formed in the length direction of the shifting fork mounting groove, the front section of the planetary shaft mounting hole comprises a first hole section (112) and a second hole section (113) which are coaxial, the inner diameter of the first hole section (112) is larger than that of the second hole section (113), and a step surface is formed at the joint of the first hole section and the second hole section;

The planetary shaft (12) passes through the planetary shaft mounting hole and is in sliding fit with the planetary shaft mounting hole, the planetary gears (13) are provided with a plurality of planetary gears, the planetary gears are assembled at the rear end of the planetary shaft (12), and the reduction gear ring (14) is sleeved on the plurality of planetary gears (13) and meshed with the planetary gears;

Be provided with collar mounting groove (121) on the lateral wall of planet axle (12) front end, be equipped with collar (15) on collar mounting groove (121), be equipped with on collar (15) and keep off cover (16), when shifting fork (4) drive isolator (11) back and forth on planet axle (12), keep off cover (16) and remove in first hole section (112) and limit by the ladder facing removal of first hole section (112) inner.

3. The automobile starter according to claim 2, wherein the isolator (11) comprises a first forward one-way section (114) and a second rearward one-way section (115), the first one-way section (114) and the second one-way section (115) being in rolling engagement with each other by means of a roller (116), the first and second hole sections (112, 113) being located within the first one-way section (114), the fork mounting groove (111) being located on an outer side wall of the second one-way section (115);

The front part of the second hole section (113) is provided with an oil-retaining bearing (117), and the side wall of the rear part is provided with a spline mounting groove (118).

4. A starter for a vehicle according to claim 3, characterized in that the side wall of the planetary shaft (12) is provided with splines (122) which are matched with the spline mounting grooves (118), the rear end of the planetary shaft (12) is provided with a mounting disc (123), and the mounting disc (123) is provided with a plurality of intermediate shafts (124) for mounting the planetary gears (13).

5. The automobile starter according to claim 2, wherein the reduction gear ring (14) is provided with a radial positioning boss (141) and a through piece notch (142), and the reduction gear ring (14) is a multi-internal tooth plastic piece.

6. The automobile starter according to claim 2, characterized in that the middle outer side wall of the isolator (11) is provided with a deep groove ball bearing (17), and the front outer side wall is provided with a driving gear.

7. The automobile starter according to claim 1, characterized in that the front end cover (2) is an aluminum casting, the front end of which is provided with a mounting spigot (21).

8. The automobile starter according to claim 1, characterized in that the armature (6) is of wave winding coil construction.

9. The vehicle starter according to claim 8, characterized in that the armature (6) comprises 25 coils.

10. The automobile starter of claim 9 wherein the 25 coils form two parallel circuits.