JPH01224463A - Inertial diving starter motor for outboard motors - Google Patents

Abstract

PURPOSE:To prevent intrusion of external water into a clutch and provide stable performance by installing a resilient member on the fixed part of a clutch cover, extending this resilient member to a groove formed in a part of a pinion, and thereby accomplishing a contactless structure. CONSTITUTION:The inner 2 of an over-running clutch 3 is formed on the shaft 11 of a pinion 1. A roller 5 and a roller push spring 6 are interposed between the inner 2 and outer 4 of this clutch 3. A semicircular supporting plate 7 is placed on the end faces of these inner 2 and outer 4, and a peripheral covering 9 is put with a cover 8 of resilient substance interposed. A groove 12 is formed in the lower part of the pinion 1, and in this groove 12 a protrusion as an extension of the cover 8 shall be located as facing contactlessly. This allows water drops, which are attached to the periphery of the pinion 1 and flow down, to drip down to a front bracket 18 through the mentioned peripheral covering 9, and then they are exhausted from a drain hole 19.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a pinion clutch structure of an inertial plunge starter motor for an outboard motor, and in particular, the effectiveness of the clutch is impaired due to rust caused by salt water intrusion. The present invention relates to a structure of a clutch part of a starting motor that is mounted vertically and is suitable for preventing such problems.

[Conventional technology]

The conventional device is Utility Model No. 52-100443.100444
As described in the above issue, the elastic body of the clutch cover caulking part is extended and slid on the shaft of the pinion, and
A structure in which a cover is provided on the outer periphery of the pinion as described in No. 100444, and a structure in which a cover is provided on the outer periphery of the pinion shaft extending from the clutch cover caulking part as described in Japanese Utility Model Application No. 54-82826. The engaged structure and the like were known.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, when the salt water dries, the sliding parts wear out quickly due to the salt, resulting in poor durability.

Due to the increased weight of the pinion, if it is kicked back by the engine's ring gear, it will quickly disengage.

Furthermore, since the pinion locking member is assembled in two parts, there are problems such as a lack of waterproofing effect.

The object of the present invention is to extend the elastic cover of the clutch cover caulking part to the circumferential groove provided below the pinion, that is, on the clutch side, in order to prevent water from entering from above. The purpose is to prevent water from entering the clutch and prevent water from forming.

Furthermore, in order not to reduce the performance of the clutch, this elastic cover is made out of contact with the pinion.

[Means to solve the problem]

The above purpose is to extend the elastic cover when tightening the clutch cover to the circumferential groove provided at the bottom of the pinion, creating a labyrinth structure to prevent water intrusion and improve corrosion resistance. Since it is a contact, the performance of the clutch can be guaranteed without changing the reverse engagement force, which is the performance of the clutch, from the conventional one, and the purpose is achieved.

[Effect]

Inertial plunge starter motors for outboard motors are usually installed vertically, and when the engine is running, moisture-laden air sucked in from the intake hole is stirred by a ring gear, and the scattered water droplets are absorbed by the starter motor's pinion shaft and It hits the pinion part and adheres to it, drips from the clutch part along the outer periphery of the motor, flows down to the bottom cover of the outboard motor, and is discharged to the outside.

Therefore, in order to prevent water droplets that flow down from the pinion from entering the clutch, the elastic cover of the clutch cover caulking part is extended to the circumferential groove below the pinion, creating a labyrinth structure to prevent water from entering the clutch. to prevent sticking.

Furthermore, since the elastic cover does not come into contact with the pinion, the reverse engagement force, which is an important performance of the clutch, does not increase, and malfunction can be prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1 is a pinion, and an inner 2 of an overrunning clutch 3 is formed on a pinion shaft 11, and a plurality of rollers 5 and roller pressing springs 6 are interposed between the inner 2 and the outer 4 of the overrunning clutch 3. Further, two semicircular branch plates 7 are placed on the end face of the inner 2 and the end face of the outer 4, and an outer circumferential cover 9 is placed on the end face of the inner 2 and the end face of the outer 4 through a cover 8 made of an elastic body. The structure is such that the roller pressure spring 6 and the grease filled in these parts do not scatter.

Further, a circumferential groove 12 is provided below the pinion l in a portion where the pinion is not machined, and the extended protruding portion 81 of the cover 8 is disposed between the grooves 12 in a non-contact manner.

Further, the armature shaft 10 is provided with a helical spline 13, which is engaged with a spline boss 14 and is molded integrally with the outer 4 of the clutch outer 3.

15 is a pinion stopper that prevents movement of the pinion 1, and 16 is a pinion return spring.

Next, reference numeral 18 denotes a front bracket having a drain hole 19, which supports the armature shaft 1o by a bearing metal 20.

17 is a stator, 21 is a rotor, and 22 is a ring gear of the engine.

Next, when the motor is started, the rotor 21 rotates, and the pinion 1, which is integral with the overrunning clutch 3, flies out to the pinion stopper 15 by the helical spline 13, meshes with the ring gear 22, and starts the engine.

When the rotational force of the engine becomes stronger than the rotational force of the motor, the pinion 1 is pushed back to its original position by the force of the pinion return spring 16 due to the action of the roller clutch, and after the starting of the engine is confirmed, the motor is stopped.

In such a configuration, the water contained in the intake air is stirred by the ring gear and becomes water droplets that adhere to the outer periphery of the pinion 1, collect, flow downward, and drip onto the front bracket 18 through the outer periphery cover 9. The water is discharged to the outside from the drain hole 19. Therefore, water droplets do not enter the clutch even when the motor is rotating or stopped.

Since the conventional structure did not have the circumferential groove 12 and the extended protruding portion 81 of the cover 8, it had the disadvantage that water droplets from the top would enter the inside of the clutch if it was installed vertically.

〔Effect of the invention〕

According to the present invention, in a vertically mounted structure such as a starter motor for an outboard motor, even if water droplets that have hit the pinion flow down toward the pinion clutch, the labyrinth structure between the extended protrusion of the elastic cover and the circumferential groove of the pinion By preventing water from entering the inside of the clutch, rust can be prevented, and poor performance due to clutch sticking can be prevented.

Furthermore, since the waterproof structure is non-contact, it is possible to prevent an increase in reverse engagement force, which is the most important factor in clutch performance, and it has the effect of being able to exhibit stable performance over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a main part showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Pinion, 3... Overrunning clutch 7... Support body, 8... Cover, 81... Cover protrusion, 12... Groove, 9... Outer periphery cover, 32...
・Ring gear.

Claims (1)

[Claims] 1. In an inertia plunge starter motor for outboard motors that has a roller clutch mounted on the pinion shaft, the elastic body provided in the part where the clutch cover is crimped and fixed extends to the groove provided in part of the pinion. An inertial plunge starter motor for an outboard motor, characterized in that it has a non-contact structure and that water from outside the vertically mounted starter motor does not enter inside the clutch.