JPH0214994B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starter pinion transfer device,
In particular, the present invention relates to a starter pinion transfer device suitable for a starter for a vehicle.

A starter for a vehicle according to the prior art includes a pinion shaft that can be moved between an operating position and a non-operating position, a starter motor for rotationally driving the pinion shaft, and a magnet for driving the starter motor. A pinion shifting device, such as a lever, is provided for urging the pinion shaft into its operating position by the suction action of a plunger provided between the plunger of the magnetic switch and the pinion shaft.

In such conventional starters, the distance between the shafts of the pinion shaft and the plunger of the magnetic switch is relatively large, and in particular the direction of movement of the pinion shaft to the operating position and the suction direction of the plunger of the magnetic switch are relatively large. In contrasting starters, the aforementioned center distances are particularly large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pinion transfer device for a starter, which eliminates the drawbacks of the prior art described above and allows the starter to be miniaturized.

The starter pinion transfer device according to the present invention comprises:
The pinion shaft is movable between an operating position and a non-operating position and is provided between a pinion shaft rotationally driven by the starter motor and a switch that drives the starter motor. A pinion transfer device for a starter for transferring a shaft to its operating position, comprising teeth provided on a plunger of a switch;
It is characterized by having a gear part that engages with this tooth part, and a cam that is rotated by this gear part and presses the pinion shaft to its operating position, whereby the pinion shaft and the plunger of the switch are The distance between the shafts can be reduced, and the starter can be made smaller.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a starter equipped with a starter pinion transfer device according to the present invention, which includes a starter motor 10, a clutch 20, such as an overrunning clutch, and a magnetic switch 30 for driving the motor 10. has.

The clutch 20 includes a clutch outer 21 that transmits the rotation of the motor 10 via an idle gear (not shown) that meshes with the armature gear 11 of the motor 10.
The clutch outer 21 is supported by the housing 23 by the bearing 22 and is connected to the clutch outer 21 via the roller 24.
It has a sleeve-shaped clutch inner 25 which is rotated by the clutch inner 25, and a pinion shaft 26 which is slidably inserted into the clutch inner 25 in the axial direction and is rotated by the clutch inner 25.

A pinion 27 is mounted on the outer end of the pinion shaft 26 and engages with a ring gear (not shown) of the engine. A torsion spline 26a is formed near the inner end of the pinion shaft 26, and engages with a torsion spline 25a formed inside the clutch inner 25.
Biased to the inoperative position shown.

A switch 30, such as a magnetic switch, for operating the motor 10 is located adjacent to the motor 10, and between the clutch 20 and the switch 30 is a starter pinion transfer device 40 according to the present invention.

The pinion transfer device 40 is attached to rotate together with a shaft 42 having teeth 41 and formed integrally with the plunger 31 of the magnetic switch 30, and a gear portion 43 that meshes with the teeth 41. The cam 44 is connected to the motor 10.
The pinion shaft 26 is rotatably supported by a pin portion 45 fixed to the center case 12 between the housing 23 and the housing 23, and is in contact with the shaft portion 29 at the inner end of the pinion shaft 26.

In the starter having the above structure, when the starter switch (not shown) is closed, the magnetic switch 30 is energized and the switch 3 is turned off.
The plunger 31 of No. 0 is attracted as shown by the arrow a, the shaft 42 similarly moves to the right in FIG. As shown, it is rotated counterclockwise in FIG. 1 to push the pinion shaft 26 to the left in FIG. That is, the pinion shaft 26 is moved from the non-operating position shown in FIG. 1 to its operating position as indicated by arrow C, and the pinion 27 meshes with the ring gear (not shown) of the engine. At this time, the rotational force of the motor 10 is transmitted to the pinion 27 via the armature gear 11, idle gear (not shown), clutch outer 21, rollers 24, clutch inner 28, splines 25a, 26a, and pinion shaft 26 to rotate the engine. do.

As described above, in the present invention, since the cam is used as the pinion shifting device, the distance between the switch shaft and the pinion shaft can be reduced.

Furthermore, according to the present invention, by making the shape of the cam 44 appropriate, it is possible to freely select the stroke speed of the shaft 29, that is, the pinion 27, with respect to the suction speed of the plunger 31 of the switch 30. You can also get

That is, as shown in FIG.
Let B be the contact part with the cam 44, O be the rotation center of the cam 44, and let h be the distance between the line parallel to the pinion shaft 26 passing through the contact part B and the rotation center O of the cam 44, then the magnetic switch 30 Since the length of the distance OB changes according to the stroke of the plunger 31 of the switch 30, by making the cam 44 have an appropriate cam shape, the stroke of the shaft 29, that is, the pinion 28, can be adjusted according to the suction speed of the plunger 31 of the switch 30. You can gain speed freely.

This will be explained with reference to FIGS. 3a, 3b, and 4 as follows.

That is, the distance of cam 44' shown in FIG. 3a.
OB' is the distance of the cam 44'' shown in Figure 3b.
OB'', and when these are rotated by an angle (α), the respective abutting portions B' and B'' move as shown as C' and C'' in FIG. 4. Therefore, The extrusion speed of pinion shaft 26 by cam 44' is calculated by cam 44''C'B'/
It can be multiplied by C″B″.

Conversely, when the stroke speed of the pinion shaft is the same, by appropriately setting the cam shape, it is possible to use magnetic switches having different suction characteristics.

For example, as shown in FIG. 5, two magnetic switches have different attraction characteristics such that the attraction forces of the magnetic switch at a certain point F in the stroke of the magnetic switch are D and E.
Considering the case of M' and M'', magnetic switch M' has a suction force FD/FE times that of magnetic switch M'.Here, the cam shape at point F is When the magnetic switch is M'', it is as shown in Fig. 3b, and when the magnetic switch is M'', it is as shown in Fig. 3a, and C'B'/C''B'' = FD/FE.
Then, the stroke speed of the pinion shaft is F
At this point, both magnetic switches M' and M'' are the same.

As described above, according to the present invention, by using a cam having a gear portion that meshes with the plunger shaft, it is possible to reduce the distance between the shafts of the pinion shaft and the plunger of the magnetic switch. This is particularly noticeable when the direction of movement of the shaft and the suction direction of the plunger are opposite to each other.

Furthermore, the present invention has the effect that by selecting an appropriate cam shape, the stroke speed of the pinion shaft can be freely adjusted to the attraction characteristics of the magnetic switch.

In the above embodiment, the shaft 42 of the magnetic switch 30 is described as being integral with the plunger 31, but it is also possible to use a shaft 42 that engages with the plunger 31 via a drive spring (not shown) or the like. You can also do that.

Further, although it has been explained that the clutch outer 21 is engaged with the armature gear 11 via the idle gear, it is easily understood that the two can also be engaged directly.

Further, although gear portion 45 and cam 44 are illustrated and described as being separate parts, the sixth
As shown in the figure, it is also possible to form the gear portion 45A of the cam 44A directly on the outer circumference of the cam 44A.

[Brief explanation of drawings]

1 is a partially cutaway side view of a starter having a starter pinion transfer device according to the present invention; FIG.
The figures are enlarged views of the main parts of Figure 1, Figures 3a and 3b.
The figures are explanatory diagrams showing the operation of cams with different shapes,
FIG. 4 is a diagram showing the changes caused by the rotation of the cam shown in FIGS. 3a and 3b, and FIG. A diagram showing the relationship, FIG. 6 is a diagram showing another embodiment of the cam. 10...Motor, 20...Clutch, 21...
Clutch outer, 25...Clutch inner, 26
...Pinion shaft, 27 ...Pinion, 30
... switch, 31 ... plunger, 40 ... pinion transfer device, 41 ... tooth section, 42 ... shaft, 43 ... gear section, 44 ... cam.

Claims (1)

[Claims] 1. A pinion shaft that is movable between an operating position and a non-operating position and that is provided between a pinion shaft rotationally driven by a starter motor and a switch that drives the starter motor, and that is In the starter pinion shifting device for moving the pinion shaft to the operating position, the plunger 31 of the switch 30
a gear portion 45 that engages with the tooth portion 41; and a cam 44 that is rotated by the gear portion 45 and presses the pinion shaft 26 toward its operating position. A pinio transfer device for a starter, comprising: