KR19990014644U - Reduction Gear Assembly of Automotive Start Motor - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a reduction gear assembly of a start motor for automobiles.

2. The technical problem the invention is trying to solve

In the related art, since the pinion of the reduction gear assembly is formed larger than the amateur shaft, a space is generated between the planetary gear shield and the pinion phase, thereby reducing the durability of the reduction gear assembly due to the outflow of grease and the inflow of foreign substances.

3. Summary of solution of design

In constructing the reduction gear assembly 30 of the start motor vehicle 10; A pinion 31 for rotating the planetary gears 33 and 34 connected to the ring gear 32 formed at the rear end of the driver shaft 20 from the armature shaft 12; Fixed to the indentation portion 41 formed smaller than the diameter of the amateur shaft 12 on the outside of the step 40 of the amateur shaft 12 so as not to protrude out of the planetary gears 33 and 34; The inner diameter of the planetary gear shield 35 is configured to have a diameter substantially the same as that of the press-fitting portion 41 formed outside the step 40 so that a space with the armature shaft 12 is not generated.

4. Important uses of the devise

By preventing grease and foreign matter from entering the reduction gear assembly, it is possible to increase the durability of the reduction gear assembly and improve the start-up of the start motor.

Description

Reduction Gear Assembly of Automotive Start Motor

The present invention relates to a reduction gear assembly of a start motor for an automobile, and more particularly, to the provision of a reduction gear assembly in which foreign material is excluded.

Automotive start motor is a part that supplies the energy required for the first suction and compression stroke for engine start. It operates by applying battery power and rotates the ring gear of the flywheel fixed to the outer end of the crankshaft of the engine. This allows the crankshaft to perform the first suction and compression stroke.

These start motors are driven by the armature assembly, which generates the rotation force for the connecting pinion to drive the ring gear, and the driver assembly, which rotates the ring gear of the engine, by receiving the rotation force of the armature, and sliding the connection pinion of the driver assembly. It consists largely of solenoid that connects with.

The portion that transmits the rotational force of the armature assembly to the drive shaft and at the same time decelerates the rotational force to a certain value is the reduction gear assembly, which is composed of pinion, planetary gear and ring gear at the tip of the armature shaft and the end of the driver assembly. .

Conventionally, since the pinion of the reduction gear assembly is formed to a considerable size, a space is generated between the planetary gear shield and the pinion phase installed for the purpose of preventing the planetary gear from being pushed outward.

As described above, when the space between the planetary gear shield and the pinion phase occurs, grease injected for lubrication flows out, and foreign matter penetrates into the reduction gear assembly.

If grease is leaked and foreign substances are introduced as above, it may cause problems of torque transfer due to the disturbance of the reduction gear assembly, as well as significantly reduce the durability of the reduction gear assembly, thereby lowering the overall performance of the start motor and reducing the service life. It provides a cause for shortening.

Therefore, in the present invention, the planetary shield is installed in close gap with the armature shaft by improving the structure of the pinion formed in the armature shaft to solve the above problems, thereby preventing the outflow of grease and infiltrating foreign substances. It is characterized by being prevented.

1 is a cross-sectional view of a general automotive start motor.

2 is a cross-sectional view of a conventional speed reducer assembly.

3 is a cross-sectional view of the reduction gear assembly to which the technique of the present invention is applied.

* Detailed description of the main parts of the drawings

10: start motor 30: reduction gear assembly

31: Pinion 32: Ring Gear

33,34: Planetary gear 35: Planetary gear shield

40 step 41: press-fitting part

Hereinafter, the configuration and operation of the present invention with reference to the accompanying drawings will be described.

1 is an overall cross-sectional view of a general motor start motor, FIG. 2 is an excerpt sectional view of a conventional speed reducer assembly, and FIG. 3 is an excerpt sectional view of a speed reducer assembly to which the technique of the present invention is applied.

As shown in FIG. 1, the starter for automobile 10 includes an armature shaft 12, an armature core 13, an armature coil 14, and a commutator 15 in the interior of the armature frame 11. A brush assembly 16, which accommodates a brush, is provided with an armature assembly 17 for generating a rotational force.

The front assembly of the armature assembly 17 is composed of an overrunning clutch 18, a connecting pinion 19, a driver shaft 20, and the like, and receives the rotational force of the armature assembly 17 to connect with the ring gear of the engine. A driver assembly 21 for driving this is provided.

Above the armature assembly 17, the spool bobbin 24 is wound with the pull-in and hold-in coil 23 in the inner side of the case 22 and the operation connected to the shell 25 of the driver assembly 21 in the inner side thereof. It consists of a solenoid 28 is provided with an operating plunger 27 to move the lever 26.

The reduction device assembly 30 is provided to reduce the rotational force transmission and the rotational force between the armature assembly 17 and the driver assembly 21.

The reduction device assembly 30 is connected to the pinion 31 which is integrally formed at the tip of the armature shaft 12 and the ring gear 32 which is arranged at the outside thereof and integrally formed at the end of the driver shaft 20. Planetary gears 33 and 34;

The planetary gears 33 and 34 are composed of a planetary gear shield 35 for preventing the planetary gears from being pushed out in the direction of the armature shaft 12.

Since the pinion 31 formed integrally with the armature shaft 12 is formed larger than the outer diameter of the armature shaft 12, the inner diameter of the planetary gear shield 35 for blocking the planetary gears 33 and 34. In addition, since it becomes larger at the same time, a space with the amateur shaft 12 is generated.

As described above, grease injected into the reduction gear assembly 30 flows out due to the space generated between the planetary gear shield 35 and the armature shaft 12, and foreign matter penetrates into the inside.

In view of the above problems, the present invention improves the amateur shaft (12) and pinion (31) to eliminate the space generated between the amateur shaft (12) and the planetary gear shield (35), the outflow of grease and foreign matter penetration Should be prevented.

Referring to the configuration of the present invention for achieving the above object in more detail with a third degree as follows.

The pinion 31 which rotates the planetary gears 33 and 34 connected to the ring gear 32 formed at the rear end of the driver shaft 20 is separated and manufactured to be coupled.

The pinion 31 is manufactured separately from the armature shaft 12 to the outside of the planetary gears 33 and 34 in the press-in portion 41 formed smaller than the diameter of the outer armature shaft 12 of the step 40. Secure it so as not to protrude.

The inner diameter of the planetary gear shield 35, which is installed to prevent the planetary gears 33 and 34 from being pushed out of the planetary gears 33 and 34, is almost equal to the indentation portion 41 formed outside the step 40. It is formed to have the same diameter so as not to generate a space with the armature shaft (12).

According to the present invention configured as described above, the pinion 31 is coupled to the indentation part 41 formed smaller than the diameter of the armature shaft 12 by separately manufacturing the pinion 31 and the pinion 31 is a planetary gear ( Since the planetary gear shield 35 is not protruded more than 33 and 34, the planetary gear shield 35 may also be positioned at the press-fit portion 41.

Therefore, since the space generation between the inner diameter of the planetary gear shield 35 and the press-in portion 41 formed on the armature shaft 12 is eliminated, the grease in the reduction gear assembly 30 is prevented from flowing out or foreign substances from flowing out. do.

The present invention as described above has the effect of increasing the durability of the reduction gear assembly and the startability of the start motor by preventing the outflow of grease and foreign matter in the reduction gear assembly.

Claims (1)

Pinion 31 formed integrally with the tip of the armature shaft 12 to reduce the rotational force transmission and the rotational force between the armature assembly 17 and the driver assembly 21 in the start motor 10 for the vehicle and its Planetary gears 33 and 34 arranged outside and connected to the ring gear 32 integrally formed at the end of the driver shaft 20; In the reduction gear assembly 30 composed of a planetary gear shield 35 for preventing the planetary gears 33 and 34 from being pushed out in the direction of the armature shaft 12, A pinion (31) for rotating the planetary gears (33, 34) connected to the ring gear (32) formed at the rear end of the driver shaft (20) separately from the armature shaft (12); Fixed to the indentation portion 41 formed smaller than the diameter of the amateur shaft 12 on the outside of the step 40 of the amateur shaft 12 so as not to protrude out of the planetary gears 33 and 34; The inner diameter of the planetary gear shield 35 has a diameter substantially the same as that of the press-in portion 41 formed on the step 40 so that the space between the planetary shaft 12 is not generated. Motor reducer assembly.