JPS5830471A - Pinion-shift device for starter - Google Patents

Abstract

PURPOSE:To engage a pinion with a ring gear before starting by providing a sleeve axially movable by an external force and another sleeve in one body with a clutch outer concentrically on the shaft of a starter motor. CONSTITUTION:When a starter switch is closed, a plunger 6 is attracted by an attraction coil 4 and a holding coil 5, and a shift lever 7 pushes a catching part 32 against a spring 14 to shift a pinion 8 toward a ring gear 9. At this stage, the first sleeve 22 is shifted toward the ring gear 9, and consequently, the second sleeve 23 is pushed by a spring 30. Then, the pinion 8 is shifted toward the ring gear 9 to enter into a concave part 27, and a clutch outer is turned by helical splines 22b and 23a for engaging the pinion 8 with the ring gear 9 perfectly. Simultaneously, a contact 12 is closed, and a starter motor 13 is started. After starting, the pinion 8 is disengaged from the ring gear 9 by the returning force of the spring 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pinion transfer device for a starter, and more particularly to a pinion transfer device for a starter having a pinion rotatably and movably supported on the rotating shaft of a starting motor used in an internal combustion engine. The present invention relates to a pinion transfer device suitable for reliably meshing a pinion with a ring gear before starting a starter motor.

Conventionally, starters for small and medium-sized car engines have often been of the electromagnetic push type. FIG. 1 is an operational diagram showing a typical example. In FIG. 1, when the starting switch 1 is turned on, current flows from the storage battery 2 to the attraction coil 4 and holding coil 5 of the electromagnetic switch 3, and the plunger 6 is attracted. Therefore, when the shift lever 70, one end of which is connected to the plunger 6, rotates, the pinion 8 is pushed out and hits a ring gear 9 of the engine (not shown). When the plunger 6 is further attracted, the push spring 11 of the overrunning clutch 10 is compressed. When the plunger 6 is further attracted and the contact 12 closes, a large current flows directly from the storage battery 2 to the starting motor 13, causing the armature 13a to rotate. This causes the teeth of pinion 8 to rub against ring gear 9.
, and the restoring force of the push-in spring 11 completely meshes with the teeth to drive the engine. When the engine starts and the rotation speed becomes faster than the electric motor 13, the automatic running clutch 10 causes the engine to rotate faster than the electric motor 13.
Power is prevented from being transmitted to 3. When the engine is completely started and the starting switch 1 is turned off, the pinion 8 and ring gear 9 are disengaged by the action of the return spring 14.

Since the starter with this configuration starts the electric motor 13 and engages the pinion 8 and the ring gear 9, it has the following drawbacks. That is, since the electric motor 13 starts with the full voltage applied to the storage battery 2, its rotation rapidly increases, so the force that presses the pinion 8 against the ring gear 9 is overcome by the rapid increase in rotation of the electric motor 13, and the pinion 8 and ring gear 9 mesh with each other. It is made as powerful as this, and the pinion 8
When the pinion hits the ring gear 9, the impact force becomes very large, and the end surfaces of the teeth of the pinion 8 and the ring gear 9 are worn out. When the wear on the end surfaces of the teeth increases, the pinion 8 and ring gear 9 will eventually no longer mesh with each other, resulting in a problem that the engine will not be able to start. The mesh between pinion 8 and ring gear 9 is a push spring 11.
The compression spring 11 is compressed and the restoring force of the push-in spring 11 helps, so the push-in spring 11 can be sufficiently compressed. The length of the starter is long, and the starter is large and expensive.

The present invention has been made in view of the above, and an object of the present invention is to provide a starter that can mesh a pinion and a ring gear before starting a starting motor, and can provide a starter with excellent starting durability. An object of the present invention is to provide a pinion transfer device.

In the present invention, first and second sleeves are provided concentrically on the rotating shaft of the starter motor so that the pinion and the ring gear can be engaged with each other without rotating the starter motor. The rotating shaft is fitted with a straight spline so that the first sleeve can be moved in the axial direction by an external force, and the second sleeve is integrally configured with a clutch outer of the overrunning clutch and Sleeve and helical spline - mating,
A fully interposed spring is provided between the sleeve of $1 and the second sleeve, and a recess into which the first sleeve can slide is provided inside the clutch clutch of the overrunning clutch, and the recess is opposite to this recess. It is characterized by a structure in which a pinion is integrally provided on the outer periphery of the side.

The present invention will be explained in detail below using the example sound shown in FIG.

FIG. 2 shows an embodiment of the present invention, and is a sectional view of a main part of a starter equipped with a pinion transfer device according to the present invention. In FIG. 2, reference numeral 15 denotes a housing, and a starter motor 13 is fixed to this housing 15 with bolts 16, and an electromagnetic switch 3 is bolted above the motor 13. The electromagnetic switch is composed of an attraction coil 4, a holding coil 5, and a plunger 6fr.The plunger 6 is connected to one end of a shift bar 7, and its position is restrained by a return spring 14. ], 3 a is the electric motor 13
The armature 17 is a rotating shaft of the electric motor 13, which is provided with a straight spline 17a'', and is supported on the protrusion 18 of the housing 15 via a bearing 19.8 is a pinion. The amount of movement is limited by a snap ring 20 and a stop ring 21 provided on the rotating shaft 17.

By the way, in this embodiment, the first sleeve 22 and the second sleeve 23 are arranged concentrically around the outer periphery of the rotating shaft 17, and the first sleeve 22 and the rotating shaft 17 are arranged at a distance L/-.
1- Straight spline fitting is performed between the splices 722a and 178, and the first sleeve 22 and the second sleeve 23
The helical splines 22b and 238 are helical spline fitted. And the second sleeve 23
is clutch outer 2 of overrunning clutch 13
4, and inside the clutch outer 24,
The clutch inner 26 is entirely supported via the rollers 25. A recess 27 is provided inside the clutch inner 26 so that the first sleeve 22 can slide in the axial direction within the recess 27. The first sleeve 22 and the second sleeve 23 are connected to a first sleeve on the outer periphery of the second sleeve 23.
It is separated by a spring 30 provided between the locking ring 29 supported by the stopper 28 at the end of the first sleeve 22 and the clutch outer 24, and its position is relative to the protrusion 22C of the first sleeve 22. It is recommended to limit the amount. In this way, the first sleeve 22 and the second sleeve 2
4 are separated to the maximum by the reaction force of the spring 30, so that the fourth part 27 and the space part 3 form a space. The other end of the shift lever 7 is fixed to a locking portion 32 of a locking ring 29. 9 is a ring gear.

Next, the operation will be explained. As explained using FIG. 1, when the starting switch 1 is fully turned on, the electromagnetic switch 3 is energized and the plunger 6 is attracted to the left by the action of the attraction coil 4 and the holding coil 50. Return spring 14 fully deflected -1: While shifting, the locking portion 32 is moved so that the shift l-V bar 7 moves the pinion 8 to the tenth position of the ring gear 9.
Press. At this point, the trench spring 30 is not compressed, so the first spring 22 and the second sleeve 2
It is farthest from 3. As a result, the first sleeve 22
spline 22 towards ring gear 9)
a, 17a, and as the second sleeve 23 is moved by the spring 30, the pinion 8 moves linearly toward the ring gear 9, and 1'n Sometimes it meshes with pinion 8/gugya 9. However, in most cases, the tooth traces of the pinion 8 and the ring gear 9 do not match, so the ends of the teeth of the two will collide. In this case, when the plunger 6 is further suctioned, the pinion 8 is left in that position,
Since the first sleeve 22 is further moved forward while compressing the spring 30 by the shift lever 7, the space 32 is contracted and the first sleeve 22 is inserted into the recess 27.
When the clutch outer 24 rotates due to the relationship between the helical splines 22b and 23a, the pinion 8 rotates, and the tooth traces of the pinion 8 and gear 9 match, and the pinion When the pinion 8 is completely restricted in its movement by the stop ring 21, it is pushed by the spring 30 and moves forward again, and the pinion 8 comes to completely mesh with the ring gear 9. 1. When the pinion 8 and the ring gear 9 mesh, the contact 12 in FIG. 1 closes at the same time, so the motor 1
3 is activated, the engine starts. En′
)/ is started and when the start switch 1 is turned off, the return spring 14
The restoring force causes the pinions 8 and 9 to disengage, returning to the original state as shown.

As described above, according to an embodiment of the present invention, the electric motor 13
Since the pinion 8 and ring gear 9 can be completely engaged before starting the pinion 8, the suction force of the electromagnetic switch 3 can be weakened, and the force with which the pinion/8 is pressed against the lever/guya 9 can be weakened. . As a result, the impact force when the pinion 8 hits the ring gear 9 becomes smaller, and the pinion 8
(9) The wear of the tooth end surface of the ring gear 9 can be minimized, and the starting durability of the starter can be improved. Furthermore, since the meshing between the pinion 8 and the ring gear 9 does not require a large restoring force like the conventional push-in spring 11, the axial length for this purpose is unnecessary.
Moreover, the required rotation angle of the pinion 8 is 1 of the teeth of the pinion 8.
Since only the pitch is required, the necessary axial length for this purpose is extremely short, and the axial length of the pinion transfer device can be made shorter than before. From the above,
The electromagnetic switch 3 can be made smaller, and this makes it possible to make the starter smaller and lighter.

As explained above, according to the invention, the pinion and ring gear can be reliably engaged before starting the starter motor, which reduces wear on the tooth end surfaces of the pinion and ring gear, and increases the durability of the starter when starting. It has the effect of improving sexual performance.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the operation of a conventional electromagnetic push-in starter, Figure 2
The figure is a sectional view of a main part of a starter showing an embodiment of the starter pinion transfer device according to the invention. (10) 7...Shift pumper, 8...Pinion, 9...Link gear, 13...Overrunning clutch, 1
7... Rotating shaft, 17a, 22a... Straight spline, 22... First sleeve, 221), 23a
...Helical spline, 23...Second sleeve, 24...Clutch outer, 25...Roller, 26
...clutch inner, 27...recess, 29...locking ring, 30...spring (11)

Claims (1)

[Claims] 1. In an internal combustion engine starter equipped with a pinion rotatably and movably supported on the rotating shaft of a starting motor,
A first sleeve and a second sleeve are all arranged concentrically on the rotating shaft, and the rotating shaft and the sleeve i1 are fitted with a straight spline, and the first sleeve is moved in the axial direction by an external force. The second sleeve is integrally formed with a clutch outer of the overrunning clutch and is helically spline fitted to the first sleeve, and there is a gap between the first sleeve and the second sleeve. The clutch inner of the overrunning clutch is provided with a recess in which the sleeve i1 can slide, and a pinion is integrally provided on the outer periphery on the opposite side of the recess. Starter pinion transfer device.