JPS6027829Y2 - engine starting device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a starting device, and particularly to an improvement of an internal reduction type starting device.

First, a conventional internal deceleration type starting device will be explained based on FIG.

In FIG. 1, 1 is an armature shaft that is a drive shaft of a starting motor fitted into an armature core (not shown), 2 is a small gear provided at the tip of this armature shaft, and 3 rotatably supports the armature shaft 1. The ball bearing 4 is an intermediate bracket that supports the ball bearing 3.
The armature shaft 1 is supported through the armature shaft 1.

A large gear 5 transmits the rotational force of the armature shaft 1 via a small gear 2.

5a is a linear spline provided on the inner periphery of the large gear 5; 6 is an output shaft having a linear spline 6a that meshes with the spline 5a of the large gear 5, and supports the large gear 5.

6b is a helical spline provided on this output shaft 6;
6c is a spline wall formed at the tip of the helical spline 6b, 6d is a groove formed at the end of the output shaft 6, 7 is an overrunning clutch connected to the output shaft 6, and 8 is the spline wall formed at the end of the helical spline 6b. A cylindrical spline boss having a helical spline 8a that meshes with the helical spline 6b of the output shaft 6, 8b is a clutch outer formed in a continuous manner with this spline boss 8, and 8c is a fitting formed on the outer periphery of this clutch outer. 9 is a cylindrical sleeve rotatably supported on the output shaft 6 via a bearing metal 10, 9a is a cylindrical clutch inner formed at one end of this sleeve, and 9b is an anti-clutch of the sleeve 9. A linear spline is formed at the side end of the inner 9a, 9c is a groove provided at the tip of the sleeve 9, 11 is an engine drive pinion attached to the sleeve 9, and the inner periphery of the pinion 11 is is provided with a linear spline lla that meshes with the spline 9b of the sleeve 9.

A retaining ring 12 is fitted into the groove 9c of the sleeve 9 to fix the pinion 11 to the sleeve 9.

The amount of movement of the pinion 11 is limited by the collision between the helical spline wall 6c of the output shaft 6 and the spline 8a of the spline boss 8.

A roller 13 is installed between the clutch outer 8b and the clutch inner 9a, and serves to transmit the rotational force from the clutch outer 8b to the clutch inner 9a, and to block rotational force in the opposite direction.

14 is a plate fitted across the clutch outer 8b and the clutch inner 9a;
3 from jumping out toward the pinion 11 side.

A cover 15 is attached to the outer peripheral surface of the clutch outer 8b, and covers the clutch outer 8b, the roller 13, the plate 14, etc.

Reference numeral 16 denotes a gasket installed between each end surface of the clutch outer 8b, the plate 14, and the cover 15 to prevent grease (not shown) filled in the housing portion of the roller 13 from flowing out.

17 is a bearing metal that slidably supports the sleeve 9; 18 is a pole bearing into which the outer of the bearing metal 17 is fitted; 19 is this ball bearing;
A front bracket 20 supports the sleeve 9 via the bearing metal 17, and 20 is the intermediate bracket 4.
A bearing metal 21 is a retaining ring fitted into the groove 6d of the output shaft 6 to prevent the output shaft 6 from moving in the axial direction through a washer 22. are doing.

23 is attached to the intermediate bracket 4, and the retaining ring 2
1, a cover 24 is an electromagnetic switch attached to the upper part of the front bracket 19, 25 is a plunger attached to this electromagnetic switch and whose movement in the axial direction is restricted, and 26 is a lever at its upper end. 26a is connected to the plunger 25, and the lower end portion 26b is engaged with a fitting portion 8c provided on the outer periphery of the spline boss 8.

27 is a pin rotatably supported on this lever 26; 28
29 is a holder that is fitted into the lever 26 and rotatably supports the pin 27;
A compression spring 7 biases the lever 26, a gasket 30 supports the compression spring and seals the opening between the front bracket 19 and the intermediate bracket 4, and 31 is an engine glue (not shown). In Ngya,
It meshes with the pinion 11 and is rotationally driven.

Next, the operation of this conventional device will be explained.

First, when the electromagnetic switch 24 is energized, the electromagnetic force causes the plunger 25 to move to the right, so that the lever 26 moves to the pin 27.
The spline boss 8 rotates in the direction of rotation of the clock using the spline boss 8 as a fulcrum.
The pinion 11 is then screwed to the left along the helical spline 6b, causing the pinion 11 and the ring gear 31 to mesh with each other.

There is no problem if the pinion 11 and ring gear 31 mesh immediately with this operation, but if these teeth collide, after the collision, the compression spring 29 is compressed and the holder 2
8 and the pin 27 supported thereby move to the right.

Since the plunger 25 also moves to the right, a switch (not shown) of the electromagnetic switch 24 closes as the plunger 25 moves to the right, thereby rotating the armature shaft 1.

The rotational force of the armature shaft 1 is transmitted from the small gear 2 to the large gear 5, the spline 5a provided on the inner periphery of the large gear 5, and the spline 6a of the output shaft 6 to the output shaft 6. The transmission is transmitted from the helical spline 6b to the spline boss 8 via the spline 8a that engages with the helical spline 6b, and then to the clutch outer 8b10-ra 13, which is integrated with the spline boss 8, to the clutch inner 9a, and further transmitted to the clutch inner 9a, which is integrated with the clutch inner 9a. spline 9b
, is transmitted to the pinion 11 via the spline 11a of the pinion 11.

Therefore, the pinion 11 is rotated in a state in which it is in pressure contact with the end face of the ring gear 31, and as the pinion 11 rotates, it meshes with the ring gear 31 due to the stored force of the compression spring 29.
The rotational force is transmitted to the ring gear 31.

Even if the rotation of the pinion 11 exceeds the rotation speed caused by the drive of the starter when the engine is started, only the components of the pinion 11 and the sleeve 9 rotate fully due to the action of the overrunning clutch, and the armature shaft 1 of the starter does not overrun.

In the above conventional structure, the spline boss 8 has a roller 13,
Since it is integrated with the pinion 11 via the sleeve 9, the spline boss 8 also moves as the pinion 11 moves, so the gap between the spline boss 8 and the ball bearing 18 is equal to the amount of movement of the pinion. In younger models, it has to be set to a higher value, which has the disadvantage of increasing the axial dimension of the starter.

The present invention solves the above-mentioned drawbacks and at the same time provides an excellent engine starting device that has a simplified overrunning clutch structure and is miniaturized.

An embodiment of this invention shown in FIG. 2 will be described below.

That is, in FIG. 2, 32 is an output shaft which is a rotating shaft having a linear spline 32a that fits with the spline lla of the pinion 11, and has a helical spline 32b in the center thereof, and the tip of the spline 32b. has a wall portion 32c.

32d is formed at the end of the output shaft 32 and is connected to the lever 2.
A fitting groove 32e is for engaging with the output shaft 32.
The pinion 11 is fixed to the output shaft 32 by fitting the retaining ring 12 into the fitting groove formed at the other end.

33 is an overrunning clutch connected to the output shaft 32 via a spline 32b; 34 is the output shaft 3;
The sleeve has a helical spline 34a fitted with the second helical spline 32b, and both ends thereof are rotatably supported by the ball bearing 18 and the ball bearing 35 attached to the front bracket 19.

34b is a clutch inner formed on the sleeve 34, 36 is a clutch boss having a clutch outer 36a fitted into the sleeve 34, and the roller 13 is installed between the clutch outer 36a and the clutch inner 34b. .

37 is a large gear formed on the outer periphery of the clutch boss 36 and meshed with the small gear 12; 38 is a lever engagement plate fitted into the output shaft 32 and the fitting groove 32d; Attach the lever lower end 26 to the mating plate 38.
b is engaged.

Next, the operation of this embodiment will be explained.

First, when the electromagnetic switch 24 is energized, the plunger 26 is moved to the right by the electromagnetic force, and therefore the lever 26 is rotated in the rotational direction of the clock using the pin 27 as a fulcrum. The portion 26b presses the output shaft 32 to the left via the engagement plate 38.

Therefore, the output shaft 32 spirals on the helical spline 34a of the sleeve 34 to engage the pinion 11 and the ring gear 31. At the same time, as the plunger 25 moves to the right, a switch (not shown) of the electromagnetic switch 24 closes. The armature shaft 1 is driven to rotate.

The rotational force of the armature shaft 1 is transmitted from the small gear 2 to the large gear 37, the clutch outer 36a roller 13 integrated with the large gear 37, the clutch inner 34b1, and the sleeve 34, and the helical spline 34 integrated with the sleeve 34.
The signal is transmitted from a to the helical spline 32b that engages with the helical spline 32b, and further transmitted to the pinion 11 via the spline 32a1, which is integrated with the helical spline 32b, and the spline lla of the pinion 11, thereby driving the ring gear 31 to rotate.

That is, in this embodiment, the pinion 11 is attached to the output shaft 32, the sleeve 34 and the pinion 11 are separated, and the output shaft 32 is pressed by the lever 26 from the opposite end of the output shaft 32 where the pinion 11 is attached. Since the overrunning clutch 33 such as the sleeve 34, clutch inner 34b10-ra 13, clutch boss 36, etc. does not move in the axial direction, the overrunning clutch 33 does not move in the axial direction. The axial dimension can be shortened by the amount that does not move.

Also, in this embodiment, since the large gear 37 is formed on the outer periphery of the clutch boss 36, it is easier to attach the large gear 5 compared to the conventional case where the large gear 5 is attached to the output shaft 6. Since the axial dimension of can be shortened, the device can be further downsized.

Moreover, since the number of man-hours for assembling the large gear 5 and the output shaft 6 is reduced, manufacturing is also simplified.

As described above, this invention includes an electromagnet device arranged in parallel with the opposite end of the rotating shaft and the drive shaft, and one end of which is engaged with the drive section of this electromagnet device, and the other end is engaged with the drive shaft of the electromagnet device. a lever that engages with the opposite end of the rotating shaft, has a substantially central portion pivotally supported by the housing, is driven by the electromagnetic device, and can move the rotating shaft so that the pinion and the ring gear can mesh with each other; Since the end of the rotating shaft on the opposite pinion side and the connection part between this end and the lever can be arranged using the space around the armature of the starting motor, the end on the opposite side of the rotating shaft and this end The connecting part between the lever and the lever can be placed without affecting the axial dimension of the device, and the axial dimension can be reduced when the rotating shaft, drive shaft, and electromagnetic device are combined, making it possible to reduce the axial dimension of the engine starting device. It is possible to achieve miniaturization, which has been an issue in the past.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional device, and FIG. 2 is a sectional view showing an embodiment of this invention. In the figure, 1 is an amateur shaft, 2 is a small gear, 5.37 is a large gear, 6 and 32 are output shafts, 6b and 32b are helical splines, 7 and 33 are overrunning clutches, and 8b
t36a is a clutch outer, 9, 34 are sleeves, 8at34a is a helical spline, 9a, 34b are clutch inners, 11 is a pinion, 13 is a roller, 1
4 is a plate, 15 is a cover, 16 is a gasket, 19 is a front bracket, 24 is an electromagnetic switch, 25 is a plunger, 26 is a lever, 31 is a ring gear, and 38 is an engagement plate. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] It is housed in a housing and has a reduction gear on the outer circumference that reduces the rotation of the drive shaft of the starter motor on an axis different from the drive shaft, and has a first spline on the inner circumference to reduce rotation in the axial direction. Overrunning clutch whose movement is prevented, the above-mentioned first
a rotating shaft having a second spline that meshes with the spline of the engine, is movable in the axial direction, and has a pinion fixed to one end that can mesh with a ring gear of the engine; an end of the rotating shaft on the opposite side of the pinion; an electromagnet device disposed in parallel and overlapping with the drive shaft; one end of the electromagnet device is engaged with the drive portion, and the other end is engaged with the opposite end of the rotating shaft; and approximately the center is pivotally supported by the casing,
A starting device comprising a lever driven by the electromagnetic device and capable of moving the rotating shaft to engage the pinion and the ring gear.