JPH032704Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial field of application This invention has a drive shaft that has a pinion at the front end that can mesh with the ring gear of the engine, which can move in the axial direction and rotate around the axis. The starter motor and the drive shaft are connected via a helical spline to push the drive shaft toward the front end according to the rotation of the starter motor when the drive shaft is braked. A return spring is interposed between the drive shafts and urges the drive shafts rearward,
Inside the housing, a brake coil facing the front side and a holding coil facing the rear side are arranged facing each other with a gap between them, and the brake plate facing the brake coil is allowed to move relative to each other in the axial direction. A starter device that is installed on the drive shaft with rotation prevented, and that is installed on the drive shaft with the holding plate facing the holding coil allowed to rotate relative to each other and allow relative axial movement within a limited range. Regarding.

(2) Prior Art Conventionally, in such a starter device, a brake plate and a drive shaft are connected via a straight spline.

(3) Problems that the invention aims to solve By the way, when the brake coil attracts the brake plate and brakes its rotation, the drive shaft is pushed toward the front end in response to the rotation of the starter motor. In the above-mentioned conventional gear, since the forward resistance due to friction in the straight spline is large, it is difficult to obtain stable meshing of the pinion with the ring gear.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a starter device that reduces forward resistance and can stably mesh a pinion with a ring gear.

B. Structure of the invention (1) Means for solving the problems According to the invention, between the drive shaft and the brake plate, a plurality of grooves extending in the axial direction are provided on the outer surface of the drive shaft. A plurality of possible rolling elements are interposed.

(2) Effect When the brake plate is attracted to the brake coil, rotation of the drive shaft is prevented because the groove extends in the axial direction, but relative movement of the drive shaft in the axial direction with respect to the brake plate is prevented by the rolling elements. Rolling within the groove reduces frictional resistance and is permitted.

(3) Embodiment Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. First, in FIG. 1, the housing 1 is
The motor accommodating part 2, the reducer accommodating part 3, and the actuating mechanism accommodating part 4 are integrally connected. An output shaft 6 of the starting motor 5 housed in the motor housing 2 projects into the reducer housing 3, and a pinion 7 is integrally provided at the tip of the output shaft 6. The pinion 7 meshes with the internal gear 8 within the reducer housing 3 . This internal gear 8 is coaxially and integrally provided with a cylindrical portion 9 that extends toward the actuating mechanism accommodating portion 4 and is rotatably supported by the housing 1 . In addition, a drive shaft 10 is disposed coaxially with the cylindrical portion 9 in the actuating mechanism housing portion 4.
will be placed. The front end portion of the drive shaft 10 is rotatably and axially movably supported by the housing 1, and the front end of the drive shaft 10 protruding from the housing 1 has a pinion 12 that can mesh with the ring gear 11 of the engine. It will be permanently installed.

A cylindrical member 13 is fixed to the rear end of the drive shaft 10, and the outer surface of the cylindrical member 13 and the inner surface of the cylindrical portion 9 are coupled via a helical spline 14. Moreover, the helical direction of the helical spline 14 is such that when braking the rotation of the drive shaft 10,
The drive shaft 10 is set so as to be pushed forward (to the right in FIG. 1) in accordance with the rotation of the starting motor 5, that is, the rotation of the internal gear 8.

A retaining ring 15 that can come into contact with the cylindrical member 13 is fitted on the inner surface of the inner end of the cylindrical portion 9, and
As shown in FIG. 1, the pinion 12 is in contact with the housing 1, and the cylindrical member 13 is in contact with the retaining ring 1.
5 and is movable in the axial direction.

In the actuation mechanism accommodating portion 4, a brake coil 16 having an annular shape concentrically surrounding the drive shaft 10 is disposed on one end wall facing the front end side of the drive shaft 10. Further, on the other end wall, an annular holding coil 17 facing the brake coil 16 is arranged with an interval in the axial direction.

In the actuating mechanism accommodating portion 4, the drive shaft 10 has a brake plate 18 facing the brake coil 16 and a holding plate 19 facing the holding coil 17.
is installed. The brake plate 18 is connected to the drive shaft 10
The holding plate 19 is allowed to move relative to the drive shaft 10 in the axial direction and is prevented from rotating relative to the drive shaft 10, and the holding plate 19 is allowed to rotate relative to the drive shaft 10 and is allowed to move relative to the drive shaft 10 within a limited range. Permissible.

In FIGS. 2 and 3, the outer surface of the drive shaft 10 has a plurality of grooves 20, for example ten, extending in the axial direction.
are bored at equal intervals in the circumferential direction, and each groove 20 is formed in a semicircular shape. On the other hand, the brake plate 18 is
It is formed into a disk shape with a through hole 21 in the center through which the drive shaft 10 is inserted, and a holding groove 22 corresponding to each groove 20 extends in the axial direction on the inner surface of the through hole 21. will be established. Moreover, each holding groove 20 is also formed in a semicircular shape.

A steel ball 23 serving as a rolling element that can roll within the groove 20 is interposed between each groove 20 and the holding groove 22 . Furthermore, regulating plates 24 and 25 are provided on both inner edges of the brake plate 18 so as to close both ends of the holding groove 22.
are fixed flush. Therefore, the steel ball 23 is held within the holding groove 22.

A retaining ring 26 that can come into contact with the steel balls 23 is fitted onto the outer surface of the drive shaft 10 near the cylindrical member 13, and the drive shaft 10 moves toward the front end until the retaining ring 26 comes into contact with each steel ball 23. can do. Further, a brake plate 18 is provided on the inner surface of the side part of the actuating mechanism accommodating portion 4.
A retaining ring 27 that can come into contact with the outer peripheral edge of the brake plate 18 is fitted, and the brake plate 18 is movable in the axial direction between a position where it is most attracted to the brake coil 16 and a position where it comes into contact with the retaining ring 27. It is.

Referring again to FIG. 1, a basically cylindrical support tube 28 is fixed to the drive shaft 10 at a portion closer to the front end than the brake plate 18. The retaining plate 19 is formed into a disk shape with an outer diameter that does not come into contact with the retaining ring 27, and a support cylinder 28 is inserted concentrically and gently through the center of the retaining plate 19. Moreover, at the end of the support tube 28 near the brake plate 18, a regulating collar 29 is provided that protrudes radially outward and can come into contact with one surface of the holding plate 19 on the brake plate 18 side. A thrust bearing 30 that can come into contact with the other surface of the holding plate 19 is fitted into the support tube 28 . Therefore, the holding plate 19 is rotatable relative to the support tube 28 fixed to the drive shaft 10, and is movable relative to the regulating collar 29 and the thrust bearing 30 only in the axial direction.

A coiled return spring 31 is interposed between the holding plate 19 and the housing 1, and the spring force of this return spring 31 urges the holding plate 19 in a direction away from the holding coil 17. Accordingly, the drive shaft 10 is urged toward the rear side.

A holding coil 1 is installed on the side of the actuating mechanism accommodating portion 4.
A position detection sensor 32 is disposed at a portion near 7, and this position detection sensor 32 detects the position of the retaining plate 19 when the drive shaft 10 advances and the pinion 12 and ring gear 11 start to mesh, and the position of the pinion. 1
2 and the position of the retaining plate 19 when the ring gear 11 is fully engaged.

Next, the operation of this embodiment will be explained. First, when the drive shaft 10 is retracted as shown in FIG. Excite it. As a result, the drive shaft 10 attempts to rotate, but a steel ball 23 is interposed between the holding groove 22 of the brake plate 18, which is attracted by the brake coil 16, and the groove 20 of the drive shaft 10. Because there are
The integral rotation operation with the brake plate 18 is prevented, and the drive shaft 10 is pushed toward the front end side by the action of the helical spline 14.

At this time, since the steel balls 23 roll within each groove 20, the drive shaft 10 is smoothly pushed out toward the front end while reducing the frictional resistance with the brake plate 18.

When the pinion 12 comes into contact with the side surface of the ring gear 11 as the drive shaft 10 moves forward, and is prevented from moving further, the drive shaft 10 slightly rotates the brake plate 18 against the attraction force of the brake coil 16. The pinion 12 and ring gear 11
When the phases match, the drive shaft 10 advances further and the pinion 12 meshes with the ring gear 11.

During this engagement, the retaining plate 19 is connected to the position detection sensor 32.
The coils 16 and 17 are located at a position where the coils 16 and 17 are detected. Therefore, the attraction of the brake plate 18 to the brake coil 16 is released, but the pinion 12 is not connected to the ring gear 1.
1, the drive shaft 10 continues to move forward, and when the position detection sensor 32 detects that the pinion 12 is completely engaged with the ring gear 11, both coils 16 and 17 are energized again. . As a result, the retaining plate 19 is attached to the retaining coil 17
The position of the drive shaft 10 is maintained by the suction.

Furthermore, when the dormitory coils 16 and 17 are energized again, the starting motor 5 is driven at the rated power. Therefore, the drive shaft 10 rotates the ring gear 11 via the pinion 12 with a rated driving force to start the engine. The reaction force at this time is received by the holding plate 19 that is attracted by the holding coil 17, but since the holding plate 19 is rotatable relative to the support cylinder 28 and is stopped, the return spring 31 is twisted. Never.

After starting the engine, the driving of the starting motor 5 is stopped and both coils 1
6 and 17 are demagnetized, and the holding plate 19 and drive shaft 1
0 is returned to the starting motor 5 side by the return spring 31. Therefore, the pinion 12 is also the ring gear 1.
Leave from 1.

C. Effects of the invention As described above, according to the invention, there are a plurality of rolling elements between the drive shaft and the brake plate that extend in the axial direction and can roll in a plurality of grooves provided on the outer surface of the drive shaft. Because the brake plate is attracted to the brake coil and the drive shaft moves forward during braking, the rolling elements roll in the groove, reducing the forward resistance and stabilizing the pinion to the ring gear. can be meshed together.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional side view, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a sectional view taken along the line -- in FIG. 2. 1...Housing, 5...Starting motor, 10...
... Drive shaft, 11 ... Ring gear, 12 ... Pinion, 14 ... Helical spline, 16 ... Brake coil, 17 ... Holding coil, 18 ...
Brake plate, 19... Retention plate, 20... Groove, 23
...Steel ball as a rolling element, 31...Return spring.

Claims (1)

[Scope of utility model registration request] A drive shaft having a pinion at the front end that can mesh with the ring gear of the engine is supported by the housing so as to be able to move freely in the axial direction and rotate around the axis. The drive shaft is connected via a helical spline to push the drive shaft toward the front end in accordance with the rotation of the starter motor during braking, and a return spring is interposed between the housing and the drive shaft to bias the drive shaft rearward. Inside the housing, a brake coil facing the front side and a holding coil facing the rear side are arranged facing each other with a gap between them, and the brake plate facing the brake coil is allowed to move relative to each other in the axial direction. A starter device that is installed on the drive shaft with rotation prevented, and that is installed on the drive shaft with the holding plate facing the holding coil allowed to rotate relative to each other and allow relative axial movement within a limited range. A starting device characterized in that a plurality of rolling elements are interposed between the drive shaft and the brake plate and can extend in the axial direction and roll in a plurality of grooves provided on the outer surface of the drive shaft. .