JPH0754740A - Engine starter - Google Patents

Abstract

PURPOSE:To impede a splash of lubricating oil of different kind from coming and going between both a casing and an engine case by isolating inner parts of the casing and the engine case for supporting a pinion shaft and a drive shaft for driving this pinion shaft. CONSTITUTION:To a front wall 1a of a casing 1 connected to an engine case E, a pinion shaft 13 inserted through this front wall is slidably supported. The front end of a drive shaft 8 for driving this pinion shaft 13 through an advance sleeve 40 and an overrunning clutch 17 is supported to th front wall 1a through the pinion shaft 13. By mounting an outer side oil seal 41 in contact with the periphery of the pinion shaft 13 on the front wall 1a and an inner side oil seal 42 in contact with the periphery of the drive shaft 8 on the pinion shaft 13 respectively, lubricating oil of different kind is impeded from coming and going between the casing 1 and the engine case E. In this way, preventing mixing the lubricating oil of different kind and forming the casing into compactness are realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine starter, and more particularly, to a casing joined to an engine case, which is provided with at least a front wall, an intermediate wall and a rear wall, and a starter motor is mounted on the rear wall of the engine starter. The front and rear end portions of the drive shaft are supported by the front wall and the intermediate wall, and the pinion shaft driven by the drive shaft is slidably fitted to the drive shaft through the advance sleeve and is rotated and slid on the drive shaft. By movably fitting and shifting the advance sleeve and pinion shaft in the axial direction by the electromagnetic actuator, the pinion at the front end of the pinion shaft moves from the retracted position where it disengaged from the ring gear in the engine case to the advanced position where it meshes with the ring gear. Things that were made to move-related to improvement.

[0002]

2. Description of the Related Art Such an engine starting device is already known, as disclosed, for example, in Japanese Utility Model Publication No. 59-28133.

[0003]

In such a conventional engine starting device, the front wall of the casing is bulged to support the front end of the drive shaft that extends forward through the pinion shaft, and one side of the casing is formed. In addition, since the window for engaging the pinion at the front end of the pinion shaft with the ring gear of the engine is opened, there is a possibility that the lubricating oil in the inside may come and go between the casing and the crankcase through the window. However, since the lubricating oil in the casing is highly viscous and the lubricating oil in the engine case is low viscous, it is not preferable to mix them because of lubrication.

The present invention has been made in view of the above points, and provides an engine starter for isolating the inside of a casing from the inside of an engine case to prevent the coming and going of lubricating oil splashes. With the goal.

[0005]

In order to achieve the above object, the present invention rotatably and slidably supports a pinion shaft having a pinion capable of meshing with a ring gear on the outside of the front wall of a casing. The drive shaft is supported by the front wall through the pinion shaft, the front wall is provided with an outer oil seal that is in close contact with the outer peripheral surface of the pinion shaft, and the pinion shaft is an inner oil seal that is in close contact with the outer peripheral surface of the drive shaft. Is mounted to separate the inside of the casing from the inside of the engine case.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1, a casing 1 of an engine starting device has a front wall 1a, an intermediate wall 1b and a rear wall 1c from the right side in the figure, and a pinion chamber 2 is provided between the front wall 1a and the intermediate wall 1b. A gear chamber 3 is defined between the intermediate wall 1b and the rear wall 1c.

The front wall 1a is formed with a boss portion 1ab which slightly bulges forward and a flange portion 1af which extends radially from the root of the boss portion 1ab. The boss portion 1ab is located on one side of the engine case E. The flange portion 1af is inserted into the opening Ea of the engine casing E, and the flange portion 1af is attached to the outer surface of the engine case E.
It is joined by the bolt 52 through.

The front end of the stator 5 of the starting motor 4 is joined to the rear wall 1c, and the front end of the rotor shaft 6 of the starting motor 4 is rotatably supported via the roller bearing 7. A rear end of the drive shaft 8 penetrating the pinion chamber 2 is rotatably supported on the intermediate wall 1b via a plain bearing 9.

The rotor shaft 6 and the drive shaft 8 are eccentric to each other by a predetermined distance and arranged in parallel with each other, and are connected to each other in the gear chamber 3 via a speed reducer 10. This reducer 10
Is composed of a small-diameter external gear 11 cut on the rotor shaft 6 and a large-diameter internal gear 12 that is connected to the drive shaft 8 and meshes with the external gear 11.

A pinion shaft 13 passing through the boss portion 1ab of the front wall 1a of the casing 1 is rotatably and slidably supported via an outer plain bearing 14. The pinion shaft 13 has a pinion 13a on the outer periphery of the front end portion and a shaft hole 13b in the center portion. The front end portion of the drive shaft 8 is relatively rotatable and slidable through the inner plain bearing 15 in the shaft hole 13b. Mated. Therefore, the front end of the drive shaft 8 is supported by the boss portion 1ab via the pinion shaft 13.

As shown in FIG. 2, the outer plain bearing 14 is fixedly mounted on the inner peripheral surface of the boss portion 1ab, and the outer oil seal 41, which is adjacent to the inner end of the bearing 14 and is in close contact with the outer peripheral surface of the pinion shaft 13, is formed on the boss. It is fitted on the inner peripheral surface of the portion 1ab. The inner plain bearing 15 is the pinion shaft 13
The inner oil seal 42, which is fixed to the inner peripheral surface of the shaft hole 13b of the pinion shaft 13 and is in close contact with the outer peripheral surface of the drive shaft 8 adjacent to the rear end of the bearing 15, is connected to the rear end of the shaft hole 13b of the pinion shaft 13 and has a large diameter. It is fitted in the hollow portion 16 of the. By doing this,
The inside of the casing 1 is isolated from the inside of the engine case E.

An overrunning clutch 17 capable of transmitting torque from the former direction to the latter direction in only one direction is interposed between the drive shaft 8 and the pinion shaft 13. The overrunning clutch 17 includes a clutch case 19 integrated with an advance sleeve 40 slidably fitted to the outer periphery of the drive shaft 8 via a helical spline 18, and an inner peripheral surface of the clutch case 19. A plurality of clutch rollers 20 are provided, and the rear end portion of the pinion shaft 13 is inserted into the clutch case 19 so as to sandwich the clutch rollers 20.

The helical spline 18 is capable of converting a part of the rotational torque of the drive shaft 8 into a forward (rightward in the figure) thrust with respect to the advance sleeve 40.

The clutch case 19 and the pinion shaft 13 are
The cover plate 21 and the circlip 22 are connected so that they can rotate relative to each other but cannot move relative to each other in the axial direction. Thus, the pinion shaft 13 is the clutch case 1
9 can slide on the drive shaft 8 between the retracted position A and the advanced position B, and at the retracted position A, the pinion 13
a is disengaged from the ring gear 27 of the engine, and the pinion 13a is meshed with the ring gear 27 at the forward position.

The retracted position A of the pinion shaft 13 is restricted by the rear end of the advance sleeve 40 contacting the annular shoulder 24 formed on the drive shaft 8 adjacent to the rear of the helical spline 18, and the retracted position A is advanced. B is restricted by the front end of the advance sleeve 40 contacting an annular pinion stopper 26 fixed to the drive shaft 8 by a locking ring 25 in the hollow portion 16 of the pinion shaft 13.

Referring again to FIG. 1, an electromagnetic actuator 28 for moving the pinion shaft 13 back and forth is arranged on one side of the starting motor 4. Housing 29 of this electromagnetic actuator 28
Is fixed to the rear end of the lateral bulging portion 1d of the casing 1 which is continuous with the front wall 1a. In the housing 29, a solenoid 30 and a fixed core 31 connected to the rear end thereof are housed and supported, and a movable core 32 facing the fixed core 31 is arranged in the hollow portion of the solenoid 30. The movable core 32 is integrally provided with an operating rod 32a protruding into the bulging portion 1d, and the operating rod 32a is connected to the advance sleeve 40 via a lever 33.

That is, one end of the lever 33 is connected to the operating rod 3
The roller 3 is engaged with the connecting hole 37 at the front end of the roller 2a, and the other end is connected to the annular fork engaging portion 38 projecting from the end wall connecting the advance sleeve 40 and the clutch case 19.
It is engaged via 9. The intermediate portion of the lever 33 is located between the actuation rod 32a and the clutch case 19 and is the casing 1
The slider 34 is swingably supported via a pivot shaft 35 by a slider 34 supported so as to be movable back and forth within a small stroke range, and the slider 34 is biased forward (to the right in the figure) by a damper spring 36. Therefore, the lever 33
When a large rearward impact force is applied to the slider 34, the slider 34 retracts while compressing the damper spring 36, and the impact force can be alleviated.

A return spring 43 for urging the rod 32a forward is attached to the operating rod 32a, and its elastic force acts on the advance sleeve 40 via the lever 33 as a retracting force.

The starting motor 4 is provided at the rear end of the electromagnetic actuator 28.
A start switch 44 for activating the is attached. The start switch 44 includes a switch case 45 fixed to the rear end of the electromagnetic actuator 28, a pair of fixed contacts 46 and 46 fixedly mounted on the switch case 45, and the switch case 4.
5, there is a movable contact 47 facing the fixed contacts 46, 46, and the movable contact 47 is urged by an opening spring 48 in a direction away from the fixed contacts 46, 46.

The movable contact 47 is held by a holding spring 50 on a rod 49 which slidably penetrates through the central portion of the fixed core 31 and faces the movable core 32.

The solenoid 30 is connected to a power source via a starting switch (not shown), and the starting motor 4 is connected to a power source via a starting switch 44.

Next, the operation of this embodiment will be described.

The movable core 32 is moved by closing a start switch (not shown) and energizing the solenoid 30 of the electromagnetic actuator 28.
Is attracted to the fixed core 31, and the lever 33 is swung counterclockwise in FIG. 1 around the pivot shaft 41 against the return spring 43, and the lever 33 moves the advance sleeve 40 forward. Along with this, the pinion shaft 13 moves to the forward drive position B regulated by the pinion stopper 26 to mesh the pinion 13a with the ring gear 27 of the engine.

When the pinion 13a meshes with the ring gear 27, the movable core 32 presses the operating rod 32a to bring the movable contact 47 of the starting switch 44 into contact with both fixed contacts 46 and 46, so that the starting switch 44 is closed and the starting motor is closed. 4 is activated.

When the starting motor 4 operates, the rotor shaft 6 decelerates and drives the drive shaft 8 via the speed reducer 10, and further the advance sleeve 40 and the overrunning clutch 1 are operated.
Since the pinion shaft 13 is driven via 7, the pinion 1
The ring gear 27 meshing with 3a rotates, the engine is cranked, and the engine can be started.

When the pinion shaft 13 is rotated at a high speed from the ring gear 27 side with this start, the overrunning clutch 17 is brought into a free state, so that transmission of reverse load to the drive shaft 8 is prevented.

After the start, if the start switch is turned off and the solenoid 28 is deenergized, the return action of the return spring 43 causes the movable core 32 and the advance sleeve 40 to return to their original positions, so that the pinion shaft 13 is retracted and the ring gear is retracted. Leave from 27. On the other hand, in the start switch 44, the movable contact 47 moves the fixed contacts 46, 4 due to the action of the opening spring 48.
Since it is separated from 6, the starting motor 4 is stopped.

By the way, the pinion shaft 13 has the casing 1
Since the pinion 13a is supported on the front wall 1a of the engine through an outer plain bearing 14 and the pinion 13a is engaged with the ring gear 27 of the engine outside the front wall 1a, the casing 1 covers the entire pinion shaft 13. In comparison, this can be made compact. Drive shaft 8
Is supported on the pinion shaft 13 via the inner plain bearing 15, so that the inner and outer plain bearings 14,
15 are concentrically arranged, and the axial dimension of the casing 1 can be shortened. Furthermore, advance sleeve 40
The pinion stopper 26 that abuts the front end of the pinion to regulate the forward movement position B of the pinion shaft 13 is the hollow portion 1 of the pinion shaft 13.
Since it is locked to the drive shaft 8 at 6, there is no need to provide an installation space dedicated to the pinion stopper 26 in the casing 1, and the casing 1 can be made more compact. Furthermore, the front wall 1a has a pinion shaft 13
An outer oil seal 41 that is in close contact with the outer circumference, and an inner oil seal 4 that is in close contact with the outer circumference of the drive shaft 8 on the pinion shaft 13
Since the inside of the casing 1 is isolated from the inside of the engine case E, the lubricating oils scattered inside the casings can be prevented and mixing of different types of lubricating oils can be avoided.

In the above embodiment, various design changes can be made without departing from the gist of the present invention. For example,
The plain bearings 14 and 15 may be replaced with ball bearings or other bearings.

[0031]

As described above, according to the present invention, a pinion shaft having a pinion capable of meshing with a ring gear outside the front wall is rotatably and slidably supported on the front wall of the casing, and this pinion shaft is supported. The drive shaft is supported by the front wall via the front wall, an outer oil seal that is in close contact with the outer peripheral surface of the pinion shaft is attached to the front wall, and an inner oil seal that is in close contact with the outer peripheral surface of the drive shaft is attached to the pinion shaft. Since the inside of the casing is isolated from the inside of the engine case, it is possible to prevent the lubricating oil from flying back and forth between the casing and the engine case, and prevent the deterioration of each lubricating oil due to the mixing of different types of lubricating oil. Moreover, by making the pinion of the pinion shaft mesh with the ring gear of the engine in front of the casing, and by arranging the bearing portions of the pinion shaft and the drive shaft concentrically, it is possible to greatly contribute to downsizing of the casing.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an engine starting device of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 1 ... Casing 1a ... Front wall 1b ... Intermediate wall 1c ... Rear wall 4 ... Starting motor 8 ... Drive shaft 13 ... Pinion Shaft 13a ... Pinion 27 ... Ring gear 28 ... Electromagnetic actuator 40 ... Advance sleeve 41 ... Outer oil seal 42 ... Inner oil seal A ... Retreat Position B: Forward position E: Engine case

Claims (1)

[Claims] 1. A casing (1) joined to an engine case (E) has at least a front wall (1a) and an intermediate wall (1).
b) and the rear wall (1c) are provided, the starting motor (4) is attached to the rear wall (1c), and the front and rear ends of the drive shaft (8) driven by the starting motor (4) are connected to the front wall (1a). And a pinion shaft (13) supported by the intermediate wall (1b) and driven by the drive shaft (8) via an advance sleeve (40) slidably fitted to the drive shaft (8). (8) is rotatably and slidably fitted, and the advance sleeve (40) and the pinion shaft (13) are axially shifted by the electromagnetic actuator (28), so that the pinion (13) at the front end of the pinion shaft (13) is moved. 13a) is moved from a retracted position (A) disengaged from a ring gear (27) in an engine case (E) to an advance position (B) in which the ring gear (27) is meshed with the engine starter. A pinion (13a) capable of meshing with a front wall (1a) of (1) with a ring gear (27) outside the front wall (1a).
A pinion shaft (13) having a shaft is rotatably and slidably supported, and a drive shaft (8) is supported by the front wall (1a) through the pinion shaft (13), and the front wall (1a) is supported by the front wall (1a). The outer oil seal (4
1), and the pinion shaft (13) is equipped with an inner oil seal (42) in close contact with the outer peripheral surface of the drive shaft (8) to isolate the inside of the casing (1) from the inside of the engine case (E). An engine starting device, characterized by: