JPH0634622Y2 - Drainage structure of engine starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] <Industrial field of application> The present invention relates to a water draining structure for an engine starter, and more particularly to an engine improved to prevent water from entering the casing from the outside. Related to a drainage structure of a starting device for a vehicle.

<Prior Art> Conventionally, there are various starters as a starter for starting an engine.
As disclosed in the publication, a pinion gear is integrally provided in a one-way clutch driven by a DC electric motor via a speed reducer composed of a planetary gear device, and the pinion gear is an engine ring gear depending on whether an electromagnetic switch is turned on or off. There is one that selectively engages the teeth to start the engine.

By the way, since it is inevitable to inject water into the housing that receives the ring gear of the engine from the outside, the casing of the starter that communicates with the inside of the housing must be
A drain hole is provided that opens to the outside of the engine with the starter attached. Also, with conventional starters,
A mounting flange portion for the engine is provided at the base end of the fitting boss portion, and the water drain hole opens outside the mounting surface corresponding to the mounting flange portion on the engine side.
Therefore, there is a possibility that water splashed up while running may enter the starter through the drain hole.

<Problems to be Solved by the Invention> In view of such problems of the conventional technology, the main purpose of the present invention is to prevent water splashed up while running, etc. The present invention relates to a water draining structure for an engine starter capable of suitably preventing entry into a casing.

[Means for Solving the Problems] <Means for Solving the Problems> According to the present invention, there is provided a casing for receiving a pinion gear connected to an electric motor for driving a ring gear of an engine, and a mounting hole for the engine. A fitting boss portion provided on the outer periphery of the intermediate portion of the casing for the Niiro soldering, and a position axially separated from the base end of the fitting boss portion of the casing for fixing the casing to the engine. And a fitting boss portion of the casing so as to face the wall surface between the mounting outward flange portion provided on the engine and the mounting surface corresponding to the mounting hole and the outward flange portion of the engine. It is achieved by providing a water draining structure for an engine starting device, characterized in that it has a water draining hole provided between it and the outward flange portion.

<Operation> Since the outer opening end of the water drain hole faces the outer wall surface between the engine mounting hole and the mounting flange portion mounting surface in this way, the outside of the water drain hole is covered by the engine wall surface. By intersecting the axial direction of the water drain hole with the extending direction of the outer wall surface of the engine, or by narrowing the gap between the outer open end of the water drain hole and the outer wall surface of the engine as much as possible. Therefore, it is possible to suitably prevent the water splashed up during traveling from entering the casing of the engine starter.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show the whole of a starter 1 with a speed reducer as an engine starting device to which the present invention is applied. The starter 1 is required for starting an engine by rotating a DC motor 2. It produces a rotational force. The right end of the motor shaft 2a of the DC motor 2 in the figure is rotatably supported by a ball bearing 5 fixed to an end cover 4 covering the commutator 3, and the left side of the figure is a separator 6 as an end plate of the motor 2. It is rotatably supported by a metal bearing 7 which is fixed to the.

A planetary gear unit 9 as a reduction gear device is provided on the left side of the motor shaft 2a in FIG. 2, a sun gear 9a is formed at the left protruding end of the motor shaft 2a, and a planetary gear 9b is provided on the sun gear 9a. It is in mesh. A center bracket 11 having large and small cylindrical portions coaxially formed in the axial direction is superposed on the left side portion of the separator 6 in the drawing, and the large diameter cylindrical portion of the center bracket 11 receives an internal gear ring gear 9c. The planetary gear unit 9 is received in a space defined by the separator 6 and the center bracket 11.

The separator 6 and the center bracket 11 are gear covers as a casing that receives a pinion gear 12 and the like described later.
It is sandwiched and fixed between 13 and the casing 2b of the motor 2. A metal bearing 14 fixed to the left protruding end of the gear cover 13 in FIG. 2 and a roller bearing 15 provided on the small-diameter cylindrical portion of the center bracket 11 make both ends of the drive shaft 16 coaxial with the motor shaft 2a. A planetary gear 9b is pivotally supported on a radially outward flange portion formed at the right end of FIG. 2 received in the center bracket 11 of the drive shaft 16.

Between the outer peripheral surface of the intermediate portion of the drive shaft 16 and the inner peripheral portion of the clutch outer 18 of the one-way roller clutch, a spline coupling portion 17 by a helical spline is formed, and the clutch inner 19 of the drive shaft is It is fitted in 16 so as to be rotatable and slidable in the axial direction. A pinion gear 12 for driving a ring gear 30 of the engine is integrally provided at a tip end in the axial direction on the left side of the clutch inner 19 in FIG.

The clutch outer 18 is provided with an annular concave portion 21 in the circumferential direction, and the bifurcated operating end portion 22a of the shift lever 22 is engaged therewith. The shift lever 22 is received in a radially outward peninsular portion 13a formed integrally with the gear cover 13, and the yoke 2 of the electromagnetic switch 23 coupled to the peninsular portion 13a.
A middle portion of the shift lever 22 is pivotally supported by a support bracket 25 sandwiched between the 4 and the peninsular portion 13a. One free end of the spring 27 is connected to the plunger 26 of the electromagnetic switch 23.
The middle portion of 27 is supported by a support bracket 25, and the other free end of the spring 27 is engaged between the pivot of the shift lever 22 and the operating end 22a. A free end portion 22b of the shift lever 22 opposite to the operating end portion 22a is also formed in a bifurcated shape, and the free end portion 22b is formed by the plunger 26 of the spring 27.
It is adapted to resiliently contact the side free end. Therefore, the plunger 26 due to the attraction force due to the excitation of the electromagnetic switch 23 and the biasing force of the return spring inside the electronic switch when not excited
The shift lever 22 can swing with the movement of the.

A battery (not shown) is electrically connected to the battery connection terminal 28 of the electromagnetic switch 23, and an ignition switch (not shown) is electrically connected to the switch terminal 20.
The motor connection terminal 29 of the electromagnetic switch 23 and the motor 2 are electrically connected to each other. When the ignition switch is set to the starter-on state, the electromagnetic switch 23 is excited and the plunger 26 is attracted, and the shift lever 22 is rotated via the spring 27 in the clockwise direction in the figure. The operating end 22a of the shift lever 22 allows the spline joint 17
Since the clutch outer 18 is pushed out while rotating by the helical spline, the clutch inner 19, that is, the pinion gear 12 meshes with the ring gear 30 of the engine. And
With the suction operation of the plunger 26, the internal contact is closed and the motor 2 is rotated. The rotation is reduced by the planetary gear unit 9 and transmitted to the pinion gear 12, the ring gear 30 is rotated, and the engine can be rotated. .

Even when the pinion gear 12 does not engage with the end faces of the teeth of the ring gear 30 during the movement of the plunger 26, the spring 26 bends and the plunger 26 is completely attracted, so the contact of the electromagnetic switch 23 closes. The motor 2 rotates, and the rotation of the motor 2 can further rotate the pinion gear 12, and the pinion gear 12 can be reliably meshed with the ring gear 30.

In the vicinity of the base end portion on the right side of FIG. 2 of the gear cover 13 of the starter 1 configured in this way, a mounting hole 32a provided in the mission case 32 for mounting the starter 1 in the mission case 32 of the engine is provided. A fitting boss portion 31 having an outer peripheral surface coaxially with the drive shaft 16 is formed so as to be joined together by brazing, and the base end of the fitting boss portion 31 of the gear cover 13 extends in the axial direction. At the separated positions, a pair of mounting outward flange portions 33 protruding outward in the radial direction are provided.
Are formed. Insert the fitting boss portion 31 into the mounting hole 32a and bring the flange portion 33 into close contact with the corresponding mounting surface 32b of the engine transmission case 32, and attach the mounting bolt to the bolt insertion hole provided at the protruding end portion of the flange portion 33. The starter 1 is fixed to the transmission case 32 by inserting the mounting bolt 34 into the screw hole provided on the transmission case 32 side through the mounting bolt 34.

In this starter 1, as shown in the drawing, a groove 41 is formed on the inner peripheral surface of the gear cover 13 along the axial direction at the bottom of the starter 1 in the mounted state. A drainage hole 42 that communicates the inside and outside of the gear cover 13 is provided between the fitting boss portion 31 and the flange portion 33 on the bottom surface of the. The drain hole 42 is a gap 43 with respect to the wall surface 32c between the fitting hole 32a and the mounting surface 32b of the mission case 32 in a state where the starter 1 is mounted on the mission case 32 of the engine.
It is open facing each other. Therefore, for example, the water splashed up while traveling is passed through the water drainage hole 42 and the gear cover.
Since it is prevented that the inside of 13 is directly reached, it is possible to preferably prevent the infiltration of water from the outside through the drain hole 42.

Further, due to the above structure, the ring gear 30 is provided inside the gear cover 13.
The water that has entered from the side is drained to the outside through the drainage hole 42 through the groove 41, so that the center bracket 11 of the planetary gear unit 9 is prevented from being immersed in water, and the waterproofness of the planetary gear unit 9 is prevented. Can improve.

[Effects of the Invention] As described above, according to the present invention, the drain hole can be provided so as to face the wall surface of the engine, and the outer opening end of the drain hole is covered by the wall surface of the engine. It is possible to suitably prevent the water splashed up during traveling from directly reaching the inside of the casing through the water drain hole.

[Brief description of drawings]

FIG. 1 is a front view showing an engine starting device to which the present invention is applied. FIG. 2 is a view showing a section along the line II-II in FIG. 1 ... Starter, 2 ... Motor 2a ... Motor shaft, 2b ... Casing 3 ... Commutator, 4 ... End cover 5 ... Ball bearing, 6 ... Separator 7 ... Metal bearing, 9 ... Planetary gear Unit 9a …… Sun gear, 9b …… Planetary gear 9c …… Internal ring gear, 11 …… Center bracket 12 …… Pinion gear, 13 …… Gear cover 13a …… Peninsular part, 14 …… Metal bearing 15 …… Roller bearing, 16 ...... Drive shaft 17 …… Spline coupling 18 …… Clutch outer, 19 …… Clutch inner 20 …… Switch terminal, 21 …… annular recess 22 …… Shift lever, 22a …… Operating end 22b …… Free end , 23 …… electromagnetic switch 24 …… yoke, 25 …… support bracket 26 …… plunger, 27 …… spring 28 …… battery connection terminal 29 …… motor connection terminal, 30 …… ring gear 31 …… fitting boss, 32 ... Missionke 32a …… Mating hole, 32b …… Mounting surface 32c …… Wall surface, 33 …… Flange part 34 …… Mounting bolt, 41 …… Groove 42 …… Drainage hole, 43 …… Gap

Continuation of the front page (56) Bibliographic references Sho 58-32174 (JP, U) Actual opening Sho 56-133252 (JP, U) Actual opening Sho 55-116877 (JP, U) Actual opening Sho 50-144832 (JP , U)

Claims (1)

[Scope of utility model registration request] 1. A casing for receiving a pinion gear coupled to an electric motor for driving a ring gear of an engine,
A fitting boss portion provided on an outer periphery of an intermediate portion of the casing for brazing with an attachment hole of the engine, and an axis line from a base end of the fitting boss portion of the casing for fixing the casing to the engine. The outward flange portion for mounting provided at a position separated in the direction, and the opening of the casing facing the wall surface between the mounting hole of the engine and the mounting surface corresponding to the outward flange portion. A drainage structure for an engine starter, comprising a drainage hole provided between a fitting boss portion and the outward flange portion.