JPS58214668A - Starter - Google Patents

Abstract

PURPOSE:To form a starter to small size, by decreasing a length of an output transmission shaft in the starter of electromagnetic throw-in type. CONSTITUTION:A running over clutch is arranged neighboring to a planetary gear reduction machine constituted by an internal gear 5 and a planetary gear 24, and the clutch is constituted by a clutch outer 3, roller 6, clutch inner shaft 8 and clutch cover 7. A pin 2a rotatably supporting a planetary gear 2 is fixedly press fitted to the clutch outer 3. A pinion gear 11 can be moved in the shaft direction with a magnet switch 14 by using the first lever 13 and the second lever 12, and a moving range of the gear 11 is limited by a stop collar 8a and a stepped part 8b of the shaft 8 in this way, a starter output transmission shaft is formed short.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starter for an internal combustion engine, and more particularly to miniaturization of an electromagnetic push type starter equipped with a planetary gear reducer and an overrunning clutch.

A conventional starter of the above type has a structure generally as shown in FIG. That is, the armature shaft 1a of the motor 15 is supported by the center case 4 via a pole bearing 1b. The sun ear 1 provided on the armature shirt Ia, the internal ear 5 fixed to the center case 4, and the planetary ear 2 are combined with each other to constitute a planetary gear reducer.

The planetary ear 2 is rotatably supported by a pin 2a, and the pin 2a is further fixed to a flange portion 18a of the clutch shaft 18. The clutch shaft 18 is internally supported rotatably by the armature shaft 1a via a needle bearing 9 at one end thereof, and a helical spline 18b is carved in a part of the shaft to engage with the spline tube 17. A stop collar 18Q is provided near the pinion ear 1 connected to the overrunning clutch 19.
The range of movement in the axial direction of 1 is limited. -Nionga 1
1, together with a spline tube 17 and an overrunning clutch 16, is moved in the axial direction by a magnet switch 14 via a lever 13, and is engaged with or disengaged from a ring gear (not shown) of the engine. In such a conventional structure, the distance A from the planetary gear reducer to the tip of the clutch shaft 18 that slidably supports the pinion ear has to be relatively long.On the other hand, the volumetric efficiency of the starter equipment has to be On the other hand, it causes a large bending torsion stress in the power transmission member.

The present invention provides an electromagnetic push type starter in which the above-mentioned parts are arranged υ more closely together than in the conventional one, thereby reducing the distance A and the number of parts, thereby alleviating the drawbacks of the prior art described above. At the same time, the aim is to reduce manufacturing costs.

That is, in the present invention, the above object is achieved by fixing the pin supporting the planetary ear to the clutch outer of the overrunning clutch and transmitting the operation of the magnetic switch to the pinion ear using a plurality of motion transmission levers. are doing.

FIG. 2 shows an embodiment of the invention, in which parts numbered the same as in FIG. 1 have the same functions as those in FIG. The armature shaft 1a of the motor 15 is supported by a center case 4 via a ball bearing 1b, and includes a sun ear 1 provided on the armature shaft 1a and an internal ear 5 fixed to the center case 4.
It is the same as in the prior art that the rotation of the shear matrices 1a is reduced by a planetary gear reducer constituted by a planetary gear 2 and a planetary gear 2. In the present invention, a running over clutch is disposed adjacent to the planetary gear reducer, and the clutch includes a clutch outer 3, a roller 6,
It consists of a clutch inner shaft 8 and a clutch cover 7 that holds the rollers 6 inside the clutch outer 3. A pin 2a that rotatably supports the planetary ear 2 is press-fitted into the clutch outer 3. The clutch inner shaft 8 has its central portion supported by a housing 16 via a pole bearing 10, and its end near the motor 15 internally supported by an armature shaft 1a via a needle bearing 9, etc. A stop collar 8o- is provided near the end. A pinion ear 11 to be engaged with a ring ear (not shown) of the engine is placed on the clutch inner shaft 8, and has a helical spline 11a on the inner surface of the hole through which the shaft 8 passes, and is threadedly engaged with the shaft 8. . Therefore, the pinion ear 11 is movable in the axial direction with relative rotation to the shaft 8, and its range of movement is limited by the stop collar 8a of the shaft 8 and the stepped portion 8b. When the relative movement in the axial direction is restrained, the rotation of the shaft 8 is completely transmitted to the pinion ear 11. In order to move the pinion ear 11 axially relative to the shaft 8, a magnetic switch 14 is provided, the actuation of which is controlled by a first spring lever 13;
The signal is transmitted to the negative ear 11 through the second lever 12, which is partially slidably held within the housing 16.

As shown in FIG. 6, the ear 11 is provided with a lever groove 11b, which engages with the fork-shaped portion of the lever 12 shown in FIG. 4 for relative rotation. The first drive spring lever 13 is swingably attached to the housing 16 at its intermediate portion, and is connected to the second lever 12 at one end and to the magnetic switch 14 at the other end. The magnetic switch 14 generates an attractive force when energized, and has a return force that pushes back the second lever 12 when not energized.

Next, the operation of this starter will be explained. When a starter switch (not shown) is turned on, the magnet switch 14 is energized, and its attractive force pushes out the t-ion ear 11 via the first spring lever 13 and the second lever 12. When the pushed out pinion gear 11 comes into contact with an engine ring ear (not shown), the movement of the pinion gear temporarily stops, but the spring of the first spring gear 13 is bent and the magnet
The plunger of the switch 14 is further attracted and the main contact for the motor 15 provided within the switch 14 is closed and the motor 15 is energized. The rotation of the motor 15 (marter shirt) 1a is decelerated by the planetary gear reducers 1, 2.5 and transmitted to the clutch outer 3, and further passes through the overrunning clutches 3, 6, 7, and 8.
It is transmitted to the clutch inner shaft 8. Since the V-shaped ear 11 is currently in contact with the ring gear and its movement in the axial direction is restricted, the rotation of the clutch inner shaft 8 is transmitted to the pinion gear 1 via the helical spline 11a.
1. When the pinion gear 11 rotates slightly, the gear 11 is pushed by the spring pressure of the first spring lever 13 and meshes with the ring gear, and the starter rotational force is transmitted to the engine and the engine starts. After starting, when the starter switch is turned off, the power to the magnet switch 14 is cut off, the return force of the switch 14 moves the syringe, and the main contact of the motor 15 is opened, and the return force is applied to the levers 13 and 12. It acts on the pinion gear 11 through the engine, pulls back the pinion ear, and stops the starter.

As explained above, according to the present invention, the V of the planetary gear 2
By directly fixing the clutch outer 3 to the clutch outer 3, and by using the second lever 12 and the second lever 12,
By moving only the magnet switch 14 in the axial direction, a compact starter with a short starter output transmission shaft can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing the arrangement of parts of a conventional starter, FIG. 2 is a partial sectional view of the starter of the present invention, and FIG.
FIG. 4 is a right side view of FIG. 6. In the figure, 2... Planetary gear, 3... Clutch outer, 8... Clutch inner shaft, 11... Pinion gear, 12... Second lever, 13... First
Spring lever, 14...Magnetic switch, 15...Motor. Representatives: Asamura and 4 people

Claims (2)

[Claims] (1) A starter having a planetary gear reduction device and an overrunning clutch, characterized in that a second gear supporting the planetary gear is fixed to a clutch outer of the overrunning clutch. (2) In a starter that has a planetary gear reduction device and an overrunning clutch and that moves a pinion gear slidably mounted on the starter output shaft in the p-axis direction using a magnetic switch, the planetary gear A starter characterized in that a pin supporting the pinion is fixed to a clutch outer of an overrunning clutch, and the operation of the magnetic switch is transmitted to the pinion ear using a plurality of motion transmission levers.