JPH0270979A - Starter - Google Patents

Abstract

PURPOSE:To improve gearing ability between a pinion and a ring gear by a method wherein the pinion is pressed against the ring gear by means of a resultant force of the press force of a first plunger to produce a high suction force with the progress of suction and a reaction force of elongation of a resilient member changed according to the press force. CONSTITUTION:When, during assembly, a gap between a pinion 123 and a ring gear 124 is higher than a reference value, a first plunger 201 is attracted by means of an exciting magnetic flux generated through energization of an exciting coil, a transfer lever 130 is rotated, and the pinion 123 is moved to the gear 124 side. After movement of the pinion 123 is stopped, the plunger 201 is further attracted, and the ring gear 124 is firmly pressed by the pinion 123. In this case, a second plunger 205 is attracted as a resilient member 214 is elongated thereby, and through the reaction force of elongation of a resilient member 214, the ring gear 124 is further pressed by the pinion 123 through the transfer lever 130.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter for starting an internal combustion engine.

[Conventional technology]

Conventionally, as shown in FIG. 4 (Japanese Utility Model Publication No. 58-7090), when a voltage is applied from a battery to an electromagnetic coil (not shown), the plunger 100 acts as a spring 101 and the first movable body 102 acts as a spring. 103 and is attracted to the fixed core 104 side. When the plunger 100 moves a certain distance, a transition lever 120, one end of which is engaged with the plunger 100, rotates.

Further, since the other end of the transition lever 120 is engaged with an engaging portion 125 provided on the overrunning clutch 122, the rotation of the transition lever 1200 causes the overrunning clutch 122 to move, and the pinion 123 is connected to the ring gear 122. get closer to

At this time, if the pinion 123 and the teeth of the ring gear 124 do not mesh with each other, the pinion 123 and the ring gear 124
and each tooth abuts on its side. Therefore, the movement of the plunger 100 is stopped with a small gap between it and the fixed iron core 1.4.

However, the magnetic flux of the electromagnetic coil passes through the plunger 100 and flows into a closed magnetic path formed by the first movable body 102, the second movable body 105, the fixed iron core 104, and the case of the magnetic switch (not shown).

, in response to the movement of this first movable body 102, the spring 10
3 is bent, the reaction force of the spring 103 is applied to the pinion 12 via the plunger 100, the transfer lever 120, the rotating shaft 121, and the overrunning clutch 122.
3. Then, the side surface of the teeth of the pinion 123 is pressed against the side surface of the teeth of the ring gear 124.

As the first movable body 102 moves, the first movable body 102
comes into contact with the second movable body 105, compresses the spring 106, and moves the second movable body 105 to the left. and,
The movable contact 107 is brought into contact with the fixed contact 108 to drive the starter motor.

Accordingly, the pinion 123 rotates slightly while being pressed against the ring gear 124 by the elastic force of the spring 1.degree.3, releases the contact state with the ring gear 124, and completely meshes with the ring gear 124. Therefore, the rotation of the pinion 123 drives the ring gear 124 and starts the engine.

[Problem to be solved by the invention]

However, in the above configuration, the gap between the pinion 123 and the ring gear 124 when assembled is misaligned due to tolerances, etc. If this gap is smaller than the standard value, there is no problem, but if it is larger, it becomes a problem. . This problem will be explained below.

Here, FIG. 3 shows the relationship between plunger stroke and spring load.

1 is a return spring (101) curve, 2 is a drive spring (103) curve, and 3 is a contact spring (106) curve.

The teeth of the pinion 123 and the ring gear 124 come into contact with each other on their sides, and the pressing force (hereinafter referred to as forward force) that the pinion 123 pushes against the ring gear 124 is normally the load C of the drive spring, but the assembly requires tolerances. Pinion 12 by etc.
When the gap between the pinion 123 and the ring gear 124 becomes larger, the amount of movement of the plunger 100 becomes smaller, so the load on the drive spring becomes smaller, and the forward force of the pinion 123 becomes the load C' of the drive spring. Therefore, pinion 1
23 decreases, the force that moves the pinion 123 toward the ring gear 124 side decreases, and the pinion 12
There is a problem in that the meshing properties between the ring gear 3 and the ring gear 124 deteriorate.

In order to solve the above-mentioned problems, the present invention improves the engagement between the pinion and the ring gear even if the gap between the pinion and the ring gear becomes larger than a standard value due to tolerances during assembly. purpose.

[Means to solve the problem]

In order to achieve the above object, the present invention rotates the transition lever using the first plunger, moves the pinion toward the ring gear, and obtains a pressing force of the pinion against the ring gear.

When the pinion comes into contact with the ring gear, the pinion is assisted in pressing against the ring gear via the transition lever by an elastic member having a lower pressing force than the first plunger. Then, the first movable contact that operates in conjunction with the second plunger, which sucks at a lower suction speed than the first plunger, contacts the first fixed contact, thereby energizing the starter motor. When the starter motor rotates, the pinion rotates, and the ring gear rotates, thereby starting the internal combustion engine.

Further, a second movable contact that interlocks with the first plunger;
A pair of second fixed contacts are provided in contact with the movable contacts and connected by a resistor. After the first movable contact and the second fixed contact come into contact with each other, the starter motor is slowly rotated via the resistor, and then the second movable contact and the second
A configuration is adopted in which the fixed contact contacts the starter motor, short-circuits the resistor, and energizes the starter motor.

[Effect]

During assembly, if the gap between the pinion and the ring gear is larger than the standard value, the first plunger is attracted by the excitation magnetic flux generated by the energization of the excitation coil, and this attraction rotates the transfer lever, causing the pinion to move toward the ring gear. Move to. Then, the movement of the pinion is stopped due to the contact between the sides of the pinion and the ring gear, but the first plunger is further attracted, and the pinion firmly presses the ring gear. At this time, the second plunger is sucked while stretching the elastic member, and the pinion further presses the ring gear via the transition lever due to the reaction force of the stretching of the elastic member. Then, the first movable contact contacts the first fixed contact, the starter motor rotates, and the pinion rotates.

During assembly, if the gap between the pinion and the ring gear is smaller than the standard value, the suction amount of the first plunger is smaller than when the gap between the pinion and the ring gear is larger than the standard value. Although the suction force caused by the second plunger becomes smaller, the amount of elongation of the elastic member by the second plunger becomes larger, and the force with which the pinion presses the ring gear becomes stronger.

The pinion firmly presses the ring gear due to the combined force of the suction force of the first plunger and the reaction force due to the stretching of the elastic member.
A slight rotation of the pinion engages the vinyl A and the ring gear.

Further, the first movable contact and the first fixed contact are brought into contact with each other, and the starter motor is energized through the resistor, so that the starter motor rotates slowly and the pinion and ring gear mesh with each other.

When the second movable contact and the first fixed contact come into contact with each other, the starter motor is energized, the starter motor changes its normal rotation, and the pinion rotates the ring gear.

〔Effect of the invention〕

As a result of the above, the pinion is firmly attached to the ring gear due to the resultant force of the pressing force of the first plunger, which gains a strong suction force as it is sucked, and the reaction force of the elongation of the elastic member, which changes according to the pressing force of the first plunger. Since the pinion and the ring gear are pressed against each other, there is no error in assembling the pinion and the ring gear, and since the pinion can obtain a sufficient force to press the ring gear, the meshing performance between the pinion and the ring gear is improved.

The slow rotation of the pinion causes the pinion and the ring gear to mesh with each other, so that combined with the pressing force of the pinion on the ring gear, it is possible to obtain even better meshing properties between the pinion and the ring gear.

〔Example] A first embodiment of the starter of the present invention will be described based on the drawings.

In FIG. 1, 200 is a first case made of a magnetic material, and this case 200 is provided with a plunger 201, which is a first plunger made of a magnetic material. A spring 202 is disposed between the -@201a side of the plunger 201 and the case 200, and the spring 202 biases the plunger 201 to the left. Furthermore, an excitation coil 203 wound around a bobbin is disposed inside the case 200 and around the outer periphery of the spring 202. By applying a voltage to this excitation coil 203, the plunger 201 is attracted to the right against the biasing force of the spring 202. One end of the excitation coil 203 is grounded. The other end of the excitation coil 203 is connected to the + side of the battery 251 via the key switch 250.

204 is a second case made of magnetic material;
04 is provided with a plunger 205 which is a second plunger and is made of a magnetic material.

A connecting rod 206 is attached to one end 205a of this plunger 205.
is integrally molded. The end 206 of this connecting rod 206
a passes through the case 204 and is inserted into a third case 20.7 attached to the case 204. A movable contact 208, which is a first movable contact, is provided at an end 206a of the connecting rod 206. A spring 209 is disposed between the movable contact 208 and the plunger 2O5,
The movable contact 208 is biased rightward by the spring 209. The movable contact 208 is connected to the connecting rod 2
It is stopped by a disc-shaped locking part 206b provided at the tip of the 06. A spring 21O is disposed between the locking portion 206b and the case 207, and the plunger 204 is urged leftward via the connecting rod 206.

Inside the case 204 is an excitation coil 21 wound around a bobbin.
1 is arranged. By applying a voltage to this excitation coil 211, the plunger 205 is activated by the spring 21.
It is attracted to the right against a biasing force of 0. One end of the excitation coil 211 is grounded, and the other end of the excitation coil 211 is connected to the + side of the battery 251 via the key switch 250.

The suction speed of each plunger is set so that the plunger 201 is suctioned at a faster suction speed than the plunger 205 by adjusting the spring force of each spring and the suction force of the plunger due to the excitation coil.

Then, the operation of the starter motor is set so that it is not determined by the plunger 205.

Furthermore, fixed contacts 212 and 213, which are first fixed contacts, are provided on the case 207 so as to be in contact with the movable contact 208. The fixed contact 212 is connected to the + side of the pantry 251, and the fixed contact 213 is connected to the starter motor 10.

The other end 205b of the plunger 205 is connected to one end 130a of the transition lever 130 with a connecting spring 214, which is an elastic member, interposed therebetween. Furthermore, the connecting spring 21
4 is provided between the transition lever and the housing as shown in Japanese Utility Model Publication No. 58-7090, but the plunger 20
It may be provided within 5. Also, the other end 2 of the plunger 201
01b is connected to the transition lever 130 at a position closer to the one end 130a side than the approximate center position of the transition lever 130 via the connecting rod 215. The transition lever 130 is rotatably provided around a support shaft 140.

An overrunning clutch 122 having an engaging portion 125 is connected to the rotating shaft 121 of the motor 10 .
It is mounted so as to be movable in the axial direction of 1. Engagement part 125
The other end 130b of the transition lever 130 is engaged with.

Further, the rotating shaft 121 includes the rotating shaft 121.
A pinion 123 that rotates integrally with 1 is provided.

Then, this pinion 123 is brought into mesh with the ring gear 124 of the engine by the movement of the transfer lever 130.

Next, the operation of the starter constructed as described above will be explained.

When the key switch 250 is closed, a voltage is applied to each excitation coil, and current flows in parallel to the excitation coil 203 and the excitation coil 211. Then, the plunger 201 is attracted to the right against the force of the spring 2020, and the plunger 205 is attracted to the right against the force of the spring 210. At this time, since the operating voltage of the plunger 205 is higher, the suction speed of the plunger is lower than that of the plunger 205.
is faster than the plunger 205.

As the plunger 201 is sucked, the connecting rod 215
The transition lever 130 rotates to the right around the support shaft 140 with the transition lever 130 interposed therebetween. When the transition lever 130 rotates, the other end 1 (30b) of the transition lever 130 attached to the retaining portion 125 pushes out the overrunning clutch 123 and the pinion 123 to the left.

Further, plunger 201 and plunger 205
is attracted, and the pinion 123 meshes with the ring gear 124. Thereafter, the movable contact 208 is connected to the fixed contacts 212 and 2.
13, current flows through the motor 10, and the motor 10 starts. Then, the pinion 123 rotates via the shaft +21, causing the ring gear 124 to rotate, thereby starting the interstage. Since the movable contact 208 is urged rightward by the spring 209, the movable contact 208 reliably contacts the fixed contacts 212 and 213.

If the pinion 123 and ring gear 124 do not mesh,
That is, the teeth of the pinion 123 on the side of the ring gear 12
Each plunger stops when the sides of the No. 4 teeth abut.

However, in this state, one end 201a of the plunger 201
Since the plunger 201 is not in contact with the inner wall of the case 200, the plunger 201 tends to be further sucked. The suction force of the plunger 201 becomes a forward force to the pinion 123.
is further pressed against the ring gear 124.

Further, while the plunger 201 is stopped, the plunger 205 compresses the spring 210 and extends the connecting spring 214, and is further attracted to the left. Then, the movable contact 208 is connected to the fixed contacts 212 and 2.
13, current flows through the motor 10, and the motor 10 starts.

Accordingly, via the shaft 121, the pinion 123
begins to rotate. At this time, the ring 123 rotates while being firmly pressed against the ring gear 124 by the suction force of the plunger 2° via the transfer lever 130 and the like. Therefore, when pinion 123 rotates slightly, pinion 1
23 and the teeth of the ring gear 124 completely mesh with each other, and the pinion 123 rotates the ring gear 124, thereby starting the engine.

Note that the pressing force by the connecting spring 214 is much smaller than the pressing force by the plunger 201.

If the gap A between the pinion 123 and the link gear 124 becomes larger than the standard value due to an assembly error or the like, the forward force of the pinion 123 in the past is only the reaction force of the spring, but in the present invention, the gap A is the standard value. If the value is larger than the reference value, when the sides of the teeth of the pinion 123 and ring gear 124 come into contact, the gap B between the one end 201b of the plunger 201 and the inner wall of the case 200 is smaller than when the gap A is the reference value. Become.

Here, the attraction force characteristic of the plunger 201 is a curve 4 as shown in FIG. Therefore, the suction force of the plunger changes from 4a to 4b, and the forward force of the pinion 123 changes from D to D' and 4.
．． : Because of this, a large forward force can be obtained, and pinion 1
Good meshing properties between the ring gear 23 and the ring gear 124 can be obtained.

Also, if the gear tooth is smaller than the standard value, pinion 1
23 and the side surfaces of the teeth of the ring gear 124, the gap B between the one end 201b of the plunger 201 and the inner wall of the case 200 becomes larger than when the gap A is the reference value, but the movable contact 208 is a fixed contact. By moving to the 212 and 213 sides, the plunger 205 moves to the right, which stretches the connecting spring, and the elastic force of the connecting spring 214 provides a forward force for the pinion 123, which improves the performance of the pinion 123 and ring gear 124. Good interlocking properties can be obtained.

As described above, the forward force of the pinion 123 is
1 and the elastic force of the connecting spring 2140, a large forward force can be obtained, and good meshing performance can be obtained regardless of assembly errors.

In addition, by dividing the plunger into a plunger that rotates the transition lever 130 and a plunger that has a movable contact that closes a contact that energizes the starter motor, and by making them separate, they can be rearranged freely such as vertically or horizontally. , improves engine mountability. Furthermore, since the pressing force of the connecting spring 214 is much smaller than the pressing force of the plunger 201, the connecting spring 214 can be made smaller.

Next, a second embodiment will be described based on the drawings.

As shown in FIG. 2, fixed contacts 260 and 26 are second fixed contacts that are closed by the suction of the plunger 201.
1 will be provided. Fixed contact 260 is connected to fixed contact 213, and fixed contact 261 is connected to motor 10. Then, the fixed contact 260 and the fixed contact 261 are connected through a resistor 264.

Further, the plunger 201 is provided with a movable contact 262 that is a first movable contact. The movable contact 262 is biased rightward by the spring 263.
The plunger 201 is biased to the left.

The other configurations are the same as in the first embodiment.

When the movable contact 208 contacts the fixed contacts 212 and 213, current flows through the resistor 261 to the motor 10.

Therefore, since the rotation of the motor is lower than in the normal case, the meshing property between the pinion 123 and the ring gear 124 becomes even better. Then, after the pinion 123 and the ring gear 124 are completely engaged, the plunger 201 is further sucked, so that the movable contact 262 is moved between the fixed contacts 260 and 2.
61 is closed, thereby obtaining normal rotation of the starter motor.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram of a starter showing a first embodiment of the present invention, Fig. 2 is a schematic block diagram of a starter showing a second embodiment of the present invention, and Fig. 3 is a relationship between plunger stroke and spring load. FIG. 4 is a sectional view of a main part of a conventional starter. 10... Starter motor, 123... Pinion, 1
24... Ring gear, 130... Transition lever, 20
1... First plunger, 203.211... Exciting coil, 205... Second plunger. Movable contact, 212.213...1st 1.1...Elastic member, 260,261 point, 262...
- Second movable contact, 2 208... First fixed contact, 2... Second fixed contact 63... Resistor.

Claims (2)

[Claims] (1) A starter motor (
10), and a pinion (12) to which the rotation of this starter motor is transmitted.
3), a ring gear (124) of an internal combustion engine that rotates when the pinion meshes with it, a transition lever (130) that moves the pinion toward the ring gear, and a transfer lever (130) that is attracted by an excitation magnetic flux and becomes stronger as it is attracted. A first plunger (201) that is sucked by a suction force and rotates the transition lever to obtain a pressing force of the pinion against the ring gear, and the first plunger (201) is sucked at a lower suction speed than the first plunger. a second plunger (205) which, when the pinion abuts the ring gear, the first plunger (205);
an elastic member (214) that assists the pinion in pressing the ring gear through the transition lever with a pressing force weaker than that of the second plunger; and a first movable contact (208) interlocking with the second plunger. ); and a first fixed contact (212, 213) that comes into contact with the movable contact and energizes the starter motor from the power source. (2) a second movable contact (262) interlocking with the first plunger; and a resistor (264) that comes into contact with the second movable contact.
) a pair of second fixed contacts (260,
261), the contact between the first movable contact and the first fixed contact energizes the starter motor via the resistor, and then the second movable contact and the first fixed contact energize the starter motor through the resistor; 2. The starter according to claim 1, wherein the resistor is short-circuited when the two fixed contacts come into contact with each other, thereby energizing the starter motor.