JPH1130171A - Starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve holding rigidity of a motor part and a magnetic switch part by setting the thickness of a flange part of a front bracket for fitting a starter to an internal combustion engine, to the specific value on the length from the fitting face of the front bracket to the rear end of the front bracket. SOLUTION: A centering location part 4c of a front bracket 4 is fitted to a starter fitting part 9 of an internal combustion engine, and a bolt 10 is thread- fastened to a flange part 4d of the front bracket 4 to mount a starter to the internal combustion engine. In this case, the thickness of the flange part 4d is set to a thickness equimultiplied from 0.7 times as long as the distance from the fitting face of the front bracket 4 to the rear end of the front bracket 4. A fitting screw of a fitting hole provided in the flange part 4d is provided on the motor side of the flange part 4d, and the circumferential position of the fitting hole provided in the flange part 4d is set into a position where an angle from a line segment parallel with mesh reaction acting at the time of a pinion 7 and a ring gear 11 being meshed is within 30 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter for starting an internal combustion engine, and more particularly, to the rigidity and strength of a front bracket for mounting the starter on the internal combustion engine and holding parts of the starter. Regarding improvement.

[0002]

2. Description of the Related Art In a starter for starting an internal combustion engine, a flange portion is generally provided on a front bracket, and the starter is mounted on the internal combustion engine via the flange portion. The front bracket has a function of holding a motor section and a magnetic switch section of the starter.

The front bracket receives a strong stress due to the vibration of the internal combustion engine and a stress due to the unevenness of the road while the vehicle is running. If the rigidity of the front bracket is insufficient, the motor unit and the magnetic switch unit may resonate. This causes the starter parts to malfunction.

The nose of the front bracket is
It holds the bearing of the output rotary shaft of the starter, and the pinion of the starter moves along the output rotary shaft.

[0005] The front bracket receives strong stress due to vibration of the internal combustion engine and stress due to unevenness of the road during running of the vehicle. When the internal combustion engine is started, the pinion of the starter meshes with the ring gear of the internal combustion engine to rotate. When transmitting power, a large meshing reaction force is generated on the meshing surface between the pinion and the ring gear. Here, the meshing reaction force received by the pinion is transmitted to the bearing of the nose portion of the front bracket via the output rotation shaft. Then, a bending moment acts on the nose portion due to the meshing reaction force. The bending moment generated here is received by the flange portion of the front bracket and the mounting bolt.

According to the above circumstances, this front bracket has considerable rigidity for holding the motor portion and the magnetic switch portion, and has sufficient strength against a meshing reaction force generated at the time of starting. There must be.

As described in Japanese Patent Application Laid-Open No. 64-69248, a conventional device has a structure in which a flange portion is provided on a mounting surface side of a front bracket and a mounting screw hole is provided in the flange portion.

[0008]

In the above prior art, if the thickness of the front bracket is small, the rigidity of holding the motor and the magnetic switch cannot be secured. Therefore, the thickness of the front bracket is increased to secure the rigidity. Was.
For this reason, this structure has a problem that the weight and cost of the front bracket increase.

In a starter in which the distance from the mounting surface of the starter to the end surface of the pinion is large, the bending moment acting on the front bracket increases even if the pinion receives the same meshing reaction when the internal combustion engine is started. There is also a problem that the strength of the flange cannot be secured.

The present invention has been made in view of these points, and an object thereof is to minimize the increase in weight and cost and to secure the rigidity of holding the motor and magnetic switch of the front bracket. By doing
It is to provide a lightweight, inexpensive and highly reliable starter.

Another object of the present invention is to secure the strength of the flange portion of the front bracket against the bending moment acting on the front bracket at the time of starting the internal combustion engine, so that the starter is lightweight, inexpensive, and more reliable. Is to provide.

[0012]

The object of the present invention is to make the thickness of the flange portion of the front bracket 0.7 to 1 times the length from the mounting surface of the front bracket to the rear end of the front bracket. At the same time, the angle of the mounting hole provided in the flange portion in the circumferential direction passes through the center of the pinion shaft of the starter, and the angle from the line parallel to the meshing reaction force acting when the pinion meshes with the ring gear is within 30 degrees. And the mounting screw of the mounting hole is provided on the motor side of the flange portion.

According to this structure, the rigidity of holding the motor and the magnetic switch of the front bracket can be greatly improved while minimizing the weight and cost of the front bracket.

Further, the strength of the flange portion of the front bracket against the bending moment acting on the front bracket when the internal combustion engine is started can be improved.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG.

In FIG. 1, an output shaft 2 of a motor 1 of a starter is supported by a bearing 4b provided on a nose 4a of a front bracket 4 and a bearing 5a of a rear bracket 5, and a roller clutch is provided on the output shaft 2. 6 and a pinion 7 are slidably supported via a shift lever 8 by the power of the magnetic switch 3.

Reference numeral 9 denotes a starter mounting portion of the internal combustion engine, which is fitted to the spigot portion 4c of the front bracket 4 and a bolt 10 is screwed to the flange portion 4d of the front bracket 4 to mount the starter on the internal combustion engine. I have. The starter mounting portion 9 of the internal combustion engine supports a weight of the starter body and a meshing reaction force when the pinion 7 of the starter meshes with the ring gear 11 of the internal combustion engine.

Next, the operation of the thus configured device will be described. When power is supplied to the magnetic switch 3 from a battery (not shown), the plunger 3 a is sucked, and the roller clutch 6 and the pinion 7 are transferred to the ring gear 11 via the shift lever 8. When the pinion 7 meshes with the ring gear 11 and the internal contact of the magnetic switch 3 closes, the motor 1 is energized, and its rotational power is transmitted to the roller clutch 6, the pinion 7 and the ring gear 1
1 to start the internal combustion engine. At this time, the meshing reaction force received by the pinion 7 is received by the bearing portion 4b of the front bracket 4 via the output shaft 2, and transmitted to the starter mounting portion 9 of the internal combustion engine via the spigot portion 4c and the flange portion 4d. And received pressure.

For this reason, the nose portion 4a of the front bracket 4 is required to have considerable strength. A bending moment acts on the nose portion due to the meshing reaction force. The bending moment generated here is received by the flange 4 d of the front bracket 4 and the mounting bolt 10. Therefore, the flange portion 4d also requires considerable strength.

As shown in FIG. 2, the thickness L1 of the flange portion 4d of the front bracket 4 is the distance L from the mounting surface of the front bracket 4 to the rear end of the front bracket 4.
The thickness is 0.7 to 1 times the thickness of 2. The mounting screw 4f of the mounting hole 4e provided in the flange portion 4d.
Are provided on the motor side of the flange portion 4d.

FIG. 3 shows the shape of the front bracket 4 when the starter is viewed from the pinion side. Here, the pinion rotation direction R as viewed from the pinion side
Indicates an example of clockwise rotation (clockwise). Mounting hole 4e provided in flange 4d of front bracket 4.
In the direction of the line AA passing through the center of the pinion shaft of the starter and parallel to the meshing reaction force F acting when the pinion 7 and the ring gear 11 are meshed with each other within 30 degrees. Have been.

By adopting such a structure, the increase in weight and cost of the front bracket can be minimized, and the rigidity of holding the motor section and the magnetic switch section of the front bracket can be greatly improved.
Further, it is possible to reduce the stress generated around the flange portion of the front bracket due to the vibration.

Further, it is possible to reduce the stress generated around the flange portion of the front bracket with respect to the bending moment acting on the front bracket when the internal combustion engine is started, thereby improving the strength.

In the embodiment of the present invention, a starter having a structure in which the mounting hole of the flange portion of the front bracket is a screw hole has been described. The effect of is obtained.

In the embodiment of the present invention, a starter in which a bearing portion is provided at a nose portion of a front bracket, which is generally called an open type, has been described. However, a pinion is an overhang type, and a bearing portion is provided at a pinion tip side. Needless to say, the same effect can be obtained even with a dustproof starter having no structure.

[0026]

According to the present invention, the rigidity of holding the motor and the magnetic switch of the front bracket can be greatly improved while minimizing the weight and cost of the front bracket.

Further, it is possible to improve the strength of the flange portion of the front bracket against the bending moment acting on the front bracket when the internal combustion engine is started,
A lightweight, inexpensive and highly reliable starter can be provided.

[Brief description of the drawings]

FIG. 1 is an overall view of a starter.

FIG. 2 is a front bracket shape diagram of the present invention.

FIG. 3 is a front bracket shape diagram of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Output shaft, 3 ... Magnetic switch, 3a ... Plunger, 4 ... Front bracket, 4
a nose, 4b, 5a bearing, 4c spigot, 4d flange, 4e mounting hole, 4f mounting screw, 5 rear bracket, 6 roller clutch, 7
Pinion, 8: Shift lever, 9: Starter mounting part, 1
0: bolt, 11: ring gear, L1: thickness of flange, L2: length from front bracket mounting surface to rear end surface, R: pinion rotation direction, F: pinion meshing reaction force, AA: center of pinion A line parallel to the pinion meshing reaction force.

Claims (3)

[Claims] 1. A motor for generating a rotational force for starting an internal combustion engine, a one-way roller clutch integrally formed with a pinion slidably supported by the output rotary shaft, and a pinion and a roller clutch. A magnetic switch that slides on the output rotary shaft and opens and closes the current supplied to the motor; and a front bracket for holding the motor and the magnetic switch and mounting a starter to the internal combustion engine. The thickness of the flange part of the front bracket for mounting the starter to the engine is the same as the length from the mounting surface of the front bracket to the rear end of the front bracket. 0.7
A starter characterized in that the thickness is double to equal. 2. The starter according to claim 1, wherein a screw of a mounting hole provided in a flange portion of the front bracket is provided on a motor side of the flange portion. 3. A line in a circumferential direction of a mounting hole provided in a flange portion of the front bracket passes through a center of a pinion shaft of a starter and is parallel to a meshing reaction force acting when the pinion meshes with a ring gear. The starter according to claim 1, wherein the angle from the minute is provided in a direction within 30 degrees.