JP2002130097A - Jump-in type engine starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the noise in the starting of an engine and to improve the jump-in property and separating property of a pinion gear 8 to a ring gear 9. SOLUTION: This jump-in type starter comprises the ring gear 9 connected to the crankshaft of the engine and the pinion gear 8 connected to a starting motor 1, and it starts the engine by jumping the pinion gear 8 to the ring gear 9 side in the start of the engine and meshing the pinion gear 8 with the ring gear 9. The ring gear 9 and the pinion gear 8 are formed of helical gears. The twisting directions of teeth of both the gears 8 and 9 are set so that a jumping directional thrust acts on the pinion gear 8 in the state where the pinion gear 8 drives the ring gear 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dive engine starting apparatus mainly applied to a vehicle engine.

[0002]

2. Description of the Related Art A dive-type engine starter includes a ring gear connected to a crankshaft of an engine, and a pinion gear connected to a starter motor. The engine is started by engaging with a ring gear. Conventionally, the ring gear and the pinion gear of such a starter are constituted by spur gears.

[0003]

In recent years, with the increasing demand for quietness of vehicles, noise at the time of starting the engine has been regarded as a problem. In particular, when performing an idle stop to improve fuel efficiency, the frequency of starting the engine increases, and therefore, measures against noise at the time of starting the engine are strongly required.

[0004] Here, in the above-mentioned diving-type engine starting device, noise due to meshing between the ring gear and the pinion gear is likely to be generated, and the noise at the time of starting the engine is relatively large. Therefore, when the idle stop system is adopted, it has been considered that a motor is arranged on the crankshaft of the engine and the engine is directly driven by the motor. However, this requires a high-output motor and a high-voltage power supply, which increases costs.

In view of the above, it is an object of the present invention to provide a low-cost, low-noise dive-type engine starter applicable to an engine employing an idle stop system.

[0006]

Means for Solving the Problems In order to solve the above problems,
The present invention includes a ring gear connected to a crankshaft of an engine, and a pinion gear connected to a start motor, and the pinion gear jumps into the ring gear side at the time of starting the engine to mesh with the ring gear. A ring gear and a pinion gear are constituted by helical gears, the direction of twisting of the teeth of the ring gear and the pinion gear, and the pinion gear drives the ring gear. In this state, it is set so that the thrust force in the diving direction acts on the pinion gear.

According to the present invention, the meshing ratio between the ring gear and the pinion gear is increased as compared with the case where the ring gear and the pinion gear are constituted by spur gears, and noise is reduced.
Also, once the axial end of the pinion gear meshes with the ring gear at the time of engine start, the pinion gear receives the thrust force generated by the twist angle of the teeth of both gears, and the pinion gear advances in the diving direction by itself. Of the ring gear into the ring gear is improved. When the pinion gear is driven by the ring gear after the engine is started, a thrust force acting on the pinion gear in a direction away from the ring gear is applied. Therefore, the releasability of the pinion gear from the ring gear after starting the engine is also improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a starting motor. A driving shaft 4 is connected to a rotor shaft 2 of the motor 1 via a planetary gear type reduction gear 3. A mover 7 that is advanced and retracted in the axial direction by a magnet switch 5 via a lever 6 is spline-engaged with the drive shaft 4. Also,
A pinion gear 8 is supported on the drive shaft 4 so as to be able to advance and retreat in the axial direction toward a ring gear 9 connected to a crankshaft of the engine. Then, the pinion gear 8 is connected to the mover 7 through a one-way clutch 10 as shown in FIG. 2, and the output of the starting motor 1 is the planetary gear type reduction gear 3, the drive shaft 4, the mover 7, and the one-way clutch. 10 to the pinion gear 8.

When the engine is started, the pinion gear 8 is moved by the magnet switch 5 via the lever 6 and the mover 7.
Jumps into the ring gear 9 side, meshes with the ring gear 9, and the ring gear 9 is driven by the pinion gear 8.
When the starter switch is turned off after the engine is started, the mover 7 is pulled back via the lever 6 by the return spring in the magnet switch 5, and the pinion gear 8 is disengaged from the ring gear 9.

Here, the ring gear 9 and the pinion gear 8
Is constituted by a helical gear as clearly shown in FIG. The torsional directions of the teeth of the ring gear 9 and the pinion gear 8 are set such that a thrust force Fa in the diving direction acts on the pinion gear 8 while the pinion gear 8 drives the ring gear 9. According to this, when the engine is started, the axial end of the pinion gear 8 is
Once the gears are engaged with each other, the above-mentioned thrust force Fa is generated, so that the pinion gear 8 advances in the dive direction by itself, and the diveability of the pinion gear 8 into the ring gear 9 is improved. Further, when the engine is started and the pinion gear 8 is driven by the ring gear 9, a thrust force Fb in the detaching direction acts on the pinion gear 8, and the pinion gear 8 is moved from the ring gear 9 after the engine starts. The detachability is improved.

When the ring gear 9 and the pinion gear 8 are constituted by helical gears as described above, the meshing ratio becomes higher than that of the case where both gears 8 and 9 are constituted by spur gears. The noise due to the meshing of No. 9 is reduced, and the noise at the time of starting the engine is reduced. FIG. 4 shows the measurement results of the noise at the time of starting the engine, and shows the ring gear 9 and the pinion gear 8.
It has been confirmed that the use of helical gears significantly reduces the noise as compared with the use of spur gears.

The engine starting device according to the above embodiment is
Although the present invention is applied to a magnetic shift type dive engine starting device in which the pinion gear 8 is moved forward and backward by the magnet switch 5, the present invention is similarly applied to other dive type engine starting devices such as a Bendix type. Applicable.

[0013]

As is apparent from the above description, according to the present invention, the noise at the time of starting the engine can be reduced,
It is possible to improve the jumping and releasability of the pinion gear with respect to the ring gear, and since the configuration is merely a helical gear between the ring gear and the pinion gear, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of an example of the apparatus of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the apparatus of FIG.

FIG. 3 is an enlarged side view of a ring gear and a pinion gear.

FIG. 4 is a graph showing measurement results of noise at the time of engine start.

[Explanation of symbols]

 1 Starting motor 8 Pinion gear 9 Ring gear

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Hiramatsu 1-4-1 Chuo, Wako, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Takashi Aoki 1-4-1 Chuo, Wako, Saitama Prefecture Inside Honda R & D Co., Ltd.

Claims (1)

[Claims] An engine includes a ring gear connected to a crankshaft of an engine, and a pinion gear connected to a motor for starting. The pinion gear jumps into the ring gear when the engine is started, and meshes with the ring gear. In a dive-type engine starter that starts the engine, the ring gear and the pinion gear are composed of helical gears, the direction in which the teeth of the ring gear and the pinion gear are twisted, and the pinion gear drives the ring gear A thrust force in a dive direction acting on the pinion gear when the pinion gear is turned on.