JPS6116263A - Starter - Google Patents

Abstract

PURPOSE:To prevent a spline from damage and surely promote its coupling, by changing a helical angle of the two splines, which transmit rotation of a starter motor to a pinion, so as to enable the spline to absorb a shock when the pinion engages with a ring gear. CONSTITUTION:If a magnet switch 21 is started, a plunger 22 moves pulling a lever 20 to be turned about a supporting point 20a serving as the center. Consequently, a pinion 10 moves to the side of a ring gear 15 further flexes a spring 19, turning on a contact of the switch 21 and starting electrification in a starter motor 1. Then an internal-combustion engine is started by rotating an armature 2 further rotating the pinion 10 and the ring gear 15. Here an excessive impact is applied if the pinion 10 while rotating is meshed with the ring gear 15 with the internal-combustion engine not starting. However, the above described impact is absorbed by deforming a helical spline 6a consisting of an elastic material because two helical splines 3a, 6a provide a relative helical angle theta.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a starter for starting an internal combustion engine.

[Conventional technology]

As shown in Japanese Utility Model Publication No. 49/2244, there is a conventional type in which a spline tube and a clutch outer are made separately so as to be spline-coupled with the armature shaft, and are coupled with a thalassochi cover.

By the way, in order to reduce weight, it is possible to make the spline tube from a relatively light material such as resin, but during inertia rotation of the starter, the rotating pinion will be restarted and the ring of the internal combustion engine will be damaged. When the gears mesh and an excessive impact in the circumferential direction is applied to the starter drive system, the impact in the circumferential direction is applied to the spline tube, and when the spline tube is twisted and deformed due to elasticity, the resin spline of the spline tube However, because the spline end of the armature shaft receives a large surface pressure, the spline tube deforms in the circumferential direction and the resin spline of the spline tube deforms and dents, causing the pinion to separate from the ring gear. There was a drawback that the recess in the resin spline of the tube interfered with the end of the spline on the armature shaft side.

[Problem that the invention seeks to solve]

To prevent damage to splines in at least one of a shaft and a spline tube made of an elastic material and to surely perform spline connection when an excessive impact in the circumferential direction is applied.

[Means for solving problems]

A pinion that meshes with a ring gear of an internal combustion engine, a shaft that transmits the rotation of a starter motor to the pinion and has a first spline formed on its outer periphery, and a second spline that is coupled to the first spline formed on its inner periphery. a spline tube, in which at least one of the first spline and the second spline is made of an elastic material, wherein the first spline and the second spline have different twist angles. It is to be used as a starter.

[For production]

Changing the helix angle between the first spline of the shaft and the second spline of the spline tube to provide a relative torsion angle between the first spline and the second spline when the pinion and the ring gear mesh, During this twist angle, the elastic deformation of the spline made of elastic material absorbs the impact in the circumferential direction.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

As shown in FIGS. 1 and 2, a shaft 3 is fixed to the center of an armature 2 of a starter motor 1. As shown in FIGS.

The housing 5 is located on the side of the shaft 3 opposite to the armature 2.
is rotatably held via a bearing 5a. Further, a first helical spline 3a is formed on the outer periphery of the shaft 3.
is formed. A cylindrical spline tube 6, which has a second helical spline 6a coupled to the first helical spline 3a on its inner periphery and a flange 6b at its end opposite to the armature 2, is connected to the shaft 3. Helical spline connection on the outer periphery. Further, the spline tube 6 is made of resin, which is an elastic material, in order to reduce the weight.

A ring-shaped clutch outer 7 is disposed at the outer peripheral end of the collar 6b of the spline tube 6. Further, on the inner periphery of the clutch outer 7, a plurality of wedge chambers 7a are provided.
is formed. Furthermore, a pin 4 is driven in to prevent the clutch outer 7 and spline tube 6 from rotating.

A clutch inner 8 is rotatably and slidably held on the outer periphery of the shaft 3 coaxially with the spline tube 6 via a bearing 9. Further, a pinion 10 is integrally formed at one end of the clutch inner 8. Between the wedge chamber 7a of the clutch outer 7 and the end of the clutch inner 8 on the side opposite to the pinion 10, there are provided a roller 11 that controls the connection state between the clutch outer 7 and the clutch inner 8, and a spring (not shown) that presses the roller 11. It has been inserted. Further, a thrust washer 12 whose inner circumference abuts the outer circumference of the clutch inner 8 is arranged on the end surface of the roller 11 on the pinion 10 side. And this thrust washer 12
This restricts the movement of the roller 11 in the axial direction and prevents the grease provided in the wedge chamber 7a of the clutch outer 7 from flowing out.

The thrust washer 12, the clutch outer 7, and the brim portion 6b of the spline tube 6 are connected to the clutch cover 14.
The guides 14a of the guides 14a tighten the wires, press each other, and fix the wires.

Further, 15 is a ring gear that meshes with the pinion 10 and starts the internal combustion engine. A cylindrical glue retainer 16 that slides on the outer periphery of the spline tube 6 has a stepped portion 16a formed at one end. Also, a snap ring 17 is attached to the outer periphery of the spline tube 6 on the starter motor 1 side.
A disk-shaped stopper 18 that restricts axial movement by
is installed. Furthermore, the starter motor 1 is connected to the stepped portion 16a of the retainer 1G and the collar portion 6a of the spline tube 6.
A drive spring 19 is installed between the side end surfaces.

The lever 20 is rotatably attached to the housing 5 about a fulcrum 20a, one end of the lever 20 engages with the outer periphery of the retainer 16, and the other end engages with the magnetic switch 2.
It is engaged with one end of the plunger 22 of No. 1. Furthermore, by closing the contacts of the magnet switch 2, the starter motor 1 is energized from the battery and rotated.

Here, FIG. 3 shows the states of the first helical spline 3a of the shaft 3 and the second helical spline 6a of the spline tube 6 when viewed from six directions shown in FIG. The second helical spline 6a shown by a dotted line is in a state when the pinion 10 returns, and the second helical spline 6a shown by a solid line is in a state when the pinion 10 and the ring gear 15 are engaged. Further, the torsion angle of the second helical spline 6a is made smaller than that of the first helical spline 3a. The angle θ is a relative twist angle between the rotational direction side end surface of the first helical spline 3a and the opposite rotational direction side end surface of the second helical spline 6a.

Further, A is the length of the first helical spline 3a in the axial direction, and is set to 25 (+am).

Furthermore, B is the length of the solid line between the end surface of the second helical spline 6a on the side opposite to the pinion 10 and the end surface of the first helical spline 3a on the armature 2 side, and is set to 13(n). At this time, the angle θ is set to 4.5 degrees.

Next, the operation of the above configuration will be explained.

Close the starter switch and Magne Noto Sui Nochi 21
When activated, the plunger 22 moves and the lever 20 is pulled on the magnetic switch 21 (regularly).Then, the lever 20 rotates around the fulcrum 20a.Then, the rotation of the lever 20 causes the retainer 16, the drive spring 19, The pinion 10 is moved to the ring gear 15 side via the spline tube 6, clutch outer 7, roller 11, and clutch inner 8.Then, when the pinion 10 directly contacts the ring gear 15, the drive spring 19 is bent and the magnetic switch 21 is The contact enters,
Start energizing starter motor 1. When the starter motor 1 is energized, the armature 2 rotates, and this rotation is transmitted to the pinion 10 via the shaft 3, spline tube 6, clutch outer 7, roller 11, clutch inner 8, and the rotation of the pinion 10 is transmitted to the ring gear 15. tell to.

Then, the internal combustion engine is started using the ring gear 15. After starting the internal combustion engine, the lever 20 is returned to its original position by a return spring (not shown) provided on the magnet switch 21 by opening the starter switch. At this time, the drive spring 19 pushes the retainer 6 back toward the starter motor 1 side, causing the retainer 16 to come into contact with the end surface of the stopper 18. The pinion 10 is also separated from the ring gear 15 and returned to the starter motor 1 side. It then returns to its original position and completes starting the internal combustion engine.

However, the internal combustion engine did not start and restarted during Stark's inertia rotation, causing the rotating pinion 10 to shift to the ring gear 1.
5, and at the time of this meshing, an excessive impact in the circumferential direction is applied. Due to this impact, as shown in Figure 3,
The first helical spline 3a and the second helical spline 6a receive forces in the directions of arrows C and D, respectively. Here, since the relative torsion angle θ with the first and second helical splines 3a and 6a is provided, the second helical spline 6a formed of elastic resin has an elasticity equal to the torsion angle θ. Because it can be deformed, this elastic deformation
Can absorb impact in the circumferential direction.

Therefore, damage to the second helical spline 6a caused by the first helical spline 3a can be prevented.

Then, a reliable spline connection between the first helical spline 3a and the second helical spline 6a can be obtained.

Also, in the case of an axial impact, the end portion of the second helical spline 6a on the armature 2 side is applied to the first helical spline 3a.
The elasticity of the resin of the second helical spline 6a allows it to be absorbed to some extent.

As shown in FIG. 4, the shape of the second helical spline 6a formed in the spline tube 6 is such that the end face on the rotation direction side is disposed on the rotation direction side. It may have a shape in which it is brought into contact with the first helical spline 3a, and the end face on the counter-rotational direction is inclined toward the first helical spline 3a, which is disposed on the rotational direction side, as it goes toward the pinion 10 side.

Further, as shown in FIG. 5, the second helical spline 6a is arranged with the pinion side end of the rotational direction side end face on the rotational direction side while maintaining the angle θ with respect to the first helical spline 3a. The first helical spline 3. is brought into contact with the first helical spline 3a, and the opposite end of the opposite-rotational side end face is disposed on the opposite-rotational side. a
It may be shaped so that it comes into contact with.

Furthermore, as shown in FIG. 6, the opposite-binion side end of the opposite-rotation side end face of the second helical spline 6a is brought into contact with the first helical spline 3a, which is disposed on the opposite-rotation direction side. The pinion side end of the second helical spline 6a may be curved to form an angle θ.

As shown in FIG. 8, when the spline tube 6 is made of iron and the shaft 3 is made of resin, the helix angle of the second spline 6a is the same as the helix angle of the first spline 3a. All you have to do is increase the helix angle.

Moreover, the first helical spline 3a of the shaft 3 is made of resin, and the second spline 6a of the spline tube 6 is
When is iron, as shown in Figures 4 to 6,
1st. The second helical splines 3a and 6a are connected to the second helical splines 3a and 6a, respectively. It may be replaced with the first helical splines 6a, 3a.

Furthermore, the first helical spline 3a of the shaft 3 and the second helical spline 6 of the spline tube 6
Both a may be made of resin.

Although the angle θ is set at 4.5 degrees, the elastic deformation rate of the spline on the resin side and the first . It is set by the tooth thickness of the second helical splines 3a, 5a, and the angle θ can usually be set from 0 degrees to 15 degrees.

In addition, at the position where the pinion meshes with the ring gear, the helical spline side made of iron is deformed as shown in Figs. 4 to 6 while maintaining an angle θ at which the spline made of resin can be elastically deformed. It's okay. Furthermore, the first helical spline 3 of the shaft 3 formed of iron
A can also be easily made into a deformed shape by rolling.

Note that one of the splines of the shaft 3 and the spline tube 6 may be a straight 1-spline.

Further, although the elastic body is made of resin, it may be made of metal that undergoes elastic deformation within a certain range.

〔Effect of the invention〕

In the case where at least one of the first spline of the shaft and the second spline of the spline tube connected to the first spline is made of an elastic material, the torsion angles of the first spline and the second spline are changed, 1st
It is possible to set a relative torsion angle between the second spline and the second spline, and during this torsion angle, the shock generated when the pinion and the ring gear mesh is suppressed by the elastic deformation of the spline made of an elastic material. This makes it possible to absorb '1Fi impact in the circumferential direction when the pinion and ring gear mesh,
This has the effect of preventing damage to the spline made of elastic material and ensuring the connection of the first and second splines.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the main parts of the embodiment described above, FIG. 2 is a partially sectional front view showing an embodiment of the present invention, and FIG. The schematic diagrams 4 to 6 showing the state of the helical spline in No. 2 are as follows:
FIG. 7 is a schematic diagram showing other embodiments of the second helical spline, and FIG. 7 is a schematic diagram showing the states of the first helical spline and the second helical spline in other embodiments of the present invention. 1... Starter motor, 3... Shaft, 3a...
・First helical spline, 6... Spline tube, 6a... Second helical spline, 10...
・Pinion, 15...Ring gear.

Claims (1)

[Claims] A pinion that meshes with a ring gear of an internal combustion engine, a shaft that transmits rotation of a starter motor to the pinion and has a first spline formed on its outer periphery, and a second spline that is coupled to the first spline formed on its inner periphery. a spline tube, in which at least one of the first spline and the second spline is made of an elastic material, wherein the first spline and the second spline have different twist angles. Starter.