JPH061776U - Starter for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a starter for an internal combustion engine, which prevents dust from entering from the rear of the nose and prevents wear of a metal and an amateur shaft. [Structure] A labyrinth 21 is provided on the outer circumference of a stopper 2 of an amateur shaft 1, and a counterbore surface 31 is provided on an inner circumference of the nose 3 at a position L apart from the labyrinth 21 by a predetermined distance L. Further, a lip 41 has a nose 3 Wall surface 3
A seal 4 is provided on the outer periphery of the stopper 2 of the amateur shaft 1 so as to be in sliding contact with the armature 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a starter for an internal combustion engine.

[0002]

[Prior art]

 The electric type starter that meshes with the outer circumference of the flywheel of the internal combustion engine to start the internal combustion engine will be explained by the output of the internal combustion engine, and the flywheel chamber of the internal combustion engine will be dry type, as described with reference to FIG. The configuration differs depending on whether it is wet or wet. In the former case, if the output is small, the nose 3 is not provided, but in the case of the large output, it is necessary to provide the nose 3 and hold the amateur shaft 1 both sides through the metal 5 provided in the nose 3. There is. In this case, it is necessary to prevent wear of the metal 5 and the armature shaft 1 due to the ingress of dust into the metal 5. That is, in the case of the former dry type, particularly in the case of the dry type that communicates with the outside air, the wear defect occurs due to the dust intrusion.

Therefore, in the conventional starter, as shown in FIG. 3 as well, a dust cover 6 is attached to the tip of the nose 3, or the dust entry passage area is reduced by overlaying the nose 3 to the rear inside, and The addition of an oil reservoir to the metal 5 prevents the dust from entering.

[0004]

[Problems to be solved by the device]

 However, in an internal combustion engine that operates in a dust atmosphere such as a sand dust area, dust entry from the tip of the nose 3 can be reduced by the dust cover 6, but dust entry from the rear stopper 9 of the nose 3 does not occur. However, the above configuration alone cannot sufficiently reduce the amount, and the metal 3 and the amateur shaft 1 are actually worn.

The present invention focuses on the above-mentioned prior art, and an object thereof is to provide a starter for an internal combustion engine that prevents dust from entering from the rear of the nose 3 and prevents wear of the metal 5 and the armature shaft 1.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the internal combustion engine starter according to the present invention will be described with reference to FIG. 1. A labyrinth 21 is provided on the outer circumference of the stopper 2 of the amateur shaft 1 and an inner circumference of the nose 3 is provided. A counterbore surface 31 is provided at an inner wall position separated from the labyrinth 21 by a predetermined distance L (claim 1).

Further, as shown in FIG. 2, a seal 4 may be provided on the outer periphery of the stopper 2 of the amateur shaft 1 so that the lip 41 is brought into sliding contact with the wall surface 32 of the nose 3. ).

[0008]

[Action]

 According to the above structure, dust from entering the metal 5 and the armature shaft 1 from the rear of the nose 3 is blocked by the labyrinth 21 or the seal 4 on the outer periphery of the stopper 2.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view showing an embodiment in which a labyrinth 21 is provided on the outer circumference of a stopper 2 of an amateur shaft 1 according to claim 1. In the figure, a labyrinth 21 is provided on the outer circumference of the stopper 2 of the amateur shaft 1 provided at the rear of the nose 3, and a counterbore surface 31 is provided on the inner circumference of the nose 3 at an inner wall position apart from the labyrinth 21 by a predetermined distance L. The tip of the nose 3 is provided with a dust cover 6 as in the prior art. The dust from the front of the nose 3 is blocked by the dust cover 6, and the dust from the rear of the nose is trapped by the labyrinth 31, so that the dust 1 is prevented from entering the metal 5 and the amateur shaft. Therefore, it is possible to prevent wear of the metal 5 and the amateur shaft 1.

The labyrinth 21 may be provided directly on the outer peripheral surface of the stopper 2, or the labyrinth 21 may be provided on the outer peripheral surface of a ring (not shown) and the ring may be fitted into the stopper 2 as appropriate. . Further, the predetermined interval L is appropriately determined according to the capacity of the starter, the destination (for dust, etc.), and the like.

Next, FIG. 2 is a view showing an embodiment in which a seal 4 is provided on the outer circumference of a stopper 2 of an amateur shaft 1 according to a second aspect. In the figure, a seal 4 is provided on the outer circumference of a stopper 2 of an armature shaft 1 provided at the rear of the nose 3, and a lip 41 of the seal 4 is in sliding contact with a wall surface 32 of the nose 3. The wall surface 32 with which the lip 41 is in sliding contact may be padded against wear of the sliding contact portion of the lip 41 due to long-term operation of the starter, or a washer (not shown) may be attached. A dust cover 6 is provided at the tip of the nose 3 as in the prior art. The dust from the front of the nose 3 is blocked by the dust cover 6, and the dust from the rear of the nose 3 is blocked by the seal 4, so that the dust entry into the metal 5 and the armature shaft 1 is blocked. Therefore, it is possible to prevent wear of the metal 5 and the amateur shaft 1.

[0012]

[Effect of device]

 As described above, in the starter for an internal combustion engine of the present invention, the labyrinth is provided on the outer circumference of the stopper of the amateur shaft, and the counterbore surface is provided on the inner wall position of the nose at a predetermined distance from the labyrinth. As a result, the dust from the rear of the nose is confined by the labyrinth, and the dust from the rear of the nose is blocked by the seal. Furthermore, since the seal is provided on the outer periphery of the stopper of the armature shaft so that the lip slides on the wall surface of the nose, dust from the rear of the nose is blocked by the seal. As a result, it becomes possible to prevent wear of the metal and the amateur shaft.

[Brief description of drawings]

1 is a partial cross-sectional external view of a starter showing an embodiment in which a labyrinth is provided on the outer circumference of a stopper of an amateur shaft according to claim 1 of the present invention.

FIG. 2 is a partial cross-sectional external view of a starter according to an embodiment of the present invention in which an armature shaft stopper is provided with a seal on the outer periphery thereof.

FIG. 3 is a partial cross-sectional external view of a starter according to a conventional technique.

[Explanation of symbols]

 1 Amateur shaft 2 Stopper 21 Labyrinth 3 Nose 4 Seal 41 Lip 5 Metal

Claims (2)

[Scope of utility model registration request] 1. A structure in which a labyrinth 21 is provided on the outer circumference of a stopper 2 of an amateur shaft 1, and a counterbore surface 31 is provided on an inner circumference of the nose 3 at an inner wall position separated from the labyrinth 21 by a predetermined distance L. Starter for internal combustion engine. 2. A starter for an internal combustion engine, characterized in that a seal 4 is provided on the outer circumference of a stopper 2 of an armature shaft 1 so that a lip 41 is brought into sliding contact with a wall surface 32 of a nose 3.