JPS6410896B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a magnetic switch for a starter.

[Conventional technology]

The conventional one is Nippondenso public technical report number 21-
039 (issued on January 20, 1981), a plunger boot is provided at the end of the magnetic switch and plunger for waterproofing and oil-proofing, and ventilation between the inside and outside of the switch is provided. A hole was provided in the plunger boot for this purpose.

[Problem that the invention seeks to solve]

However, in the conventional device described above, when the plunger is sucked back by the pump action of the plunger, from the hole in the plunger boot,
A problem arose in that water, oil, etc. were sucked in and entered the inside of the magnetic switch, causing malfunction.

Therefore, in view of the above problems, the present invention has been developed to ensure ventilation inside and outside the magnetic switch.
This prevents water, oil, etc. from entering the inside of the magnetic switch.

[Means for solving problems]

For starters, a plurality of plunger boots with ventilation holes at different positions are fixed with gaps that allow ventilation between each other, and the inner circumferential part is fixed to the plunger, and the outer circumferential part is fixed between the starter housing and the end face of the magnetic switch main body. It should be a magnetic switch.

[Effect]

By using two or more types of plunger boots, leaving gaps between the boots, and providing ventilation holes in each boot at different positions, we ensure ventilation between the inside and outside of the magnetic switch, and
This prevents water, oil, etc. from entering and maintains the operation of the magnetic switch.

〔Example〕

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

Reference numeral 1 designates a first boot, which is molded into a cup shape from an elastic material such as rubber, has a radial ventilation hole 1a, and has a bottom wall portion forming an inner circumferential portion fitted into a joint groove 3a of the plunger 3. It is attached with. 2 is a second boot, which is molded into a cup shape from an elastic material such as rubber like the first boot 1, has an axial ventilation hole 2a, and has a bottom wall that forms the inner periphery of the plunger 3. The first boot is attached to the joint groove 3a with a tightening margin. In addition, the outer peripheries of both boots 1 and 2 are sandwiched between the starter housing 9 and the end face of the switch body 4, with the outer peripheries of both boots 1 and 2 overlapped, so that waste water, etc. can be drained from the ventilation hole 1a. Thus, the first boot 1 is fixed with the ventilation hole 1a facing downward. The plunger 3 is slidably mounted within the switch body 4 and is connected to a pinion moving lever (not shown) at a joint 3b. 5 is a return spring of the plunger 3, 6 is a contact pressure spring, 7 is a movable contact, 8 is a switch cover, 9 is a center case, and 10 is a fixed contact. The ends of the switch main body 4, the switch cover 8, and the space between the center case 9 and the switch cover 8 are sealed, and the inside and outside of the magnetic switch are sealed except for the sliding opening of the plunger 3. Further, both boots 1 and 2 are stacked on top of each other with an appropriate gap to allow ventilation between them.

When the coil of the switch body 4 is energized by a starter switch (not shown), the plunger 3 is sucked against the return spring 5 while deforming both boots 1 and 2 due to its suction force, and the rear end The movable contact 7 installed in the joint part 3b closes the connection between the pair of fixed contacts 10, energizes the motor, and connects the clutch and pinion to the internal combustion engine under the normal operating condition of the starter via the lever connected to the joint part 3b. engages the ring gear of the engine and starts the internal combustion engine.

Moreover, if the power to the switch body 4 is cut off, the plunger 3 is returned by the return spring 5.
The movable contact 7 is separated from the fixed contact 10, and the motor is stopped. At the same time, the clutch is returned by the lever connected to the plunger 3, and the starter is stopped.

In the magnetic switch that operates as described above, the plunger 3 is provided with the first boot 1 having the radial ventilation hole 1a and the second boot 2 having the axial ventilation hole 2a.
You can set a long ventilation path from to the ventilation hole 2a,
When the plunger 3 is returned by the return spring 5, the inside of the switch body 4 becomes negative pressure, and the gap between the boots 1 and 2 serves to prevent infiltration from the ventilation hole 1a, and the ventilation hole 1a It becomes possible for the second boot 2 to repel flying (water, oil, etc.) from above. Therefore, it is possible to prevent foreign matter from entering the switch through the ventilation hole 1a, and it is possible to maintain good switch operation.

In the above embodiment, the first boot 1 is provided with a radial ventilation hole 1a, and the second boot 2 is provided with an axial ventilation hole 2a. It is also possible to set the axis of each ventilation hole 1a, 2a for both boots 1, 2,
The directionality in the radial direction does not matter. In addition, each ventilation hole 1a,
2a is possible as long as the hole positions are relatively far apart within a range where infiltration can be prevented.

〔Effect of the invention〕

As described above, in the present invention, the plunger boots are made in two or more layers, with gaps between the boots, and ventilation holes are provided in each boot at different positions, thereby ensuring ventilation between the inside and outside of the magnetic switch. Moreover, when the plunger is returned, the gap reliably prevents water, oil, etc. from entering the inside of the magnetic switch, and the operation of the magnetic switch can be reliably maintained, which is an excellent effect.

[Brief explanation of the drawing]

The figure is a partially sectional front view showing an embodiment of the switch of the present invention. 1, 2...first and second boots, 1a, 2a...ventilation hole, 3...plunger, 4...switch body, 9...
starter housing.

Claims (1)

[Scope of Claims] 1. A plurality of plunger boots having ventilation holes at different positions, each having a gap that allows ventilation between the boots, the inner periphery of which is connected to the plunger, and the outer periphery of which is connected to the starter housing and the end face of the magnetic switch main body. Magnetic switch for starter fixed between. 2. The starter magnetic switch according to claim 1, wherein each of the ventilation holes is provided in the radial direction in one of the boots and in the axial direction in the other.