JPH04159454A - Idle speed control device - Google Patents

Abstract

PURPOSE:To prevent infiltration of water and salt water so as to increase corrosion resistance by interposing an O ring in a cavity part generated between a case of a retightening part and a solenoid, in the case of a device in which the solenoid is stored in the case with one end opened to mechanically fixedly retighten an opening part of this case. CONSTITUTION:An idle speed control device comprises an electromagnetic mechanism part 1 and a flow control mechanism part 11, and in the electromagnetic mechanism part 1, a coil 3 is stored in a cylindrical case 2 with one end opened to arrange a core 4 and a plunger 5 in a center part of this coil 3. A sheathing molding 10, in which the coil 3, terminals 6, 7 and yokes 8, 9 are integrally molded by a plastic material, is fixed by retightening an opening part of the case 2. In the flow control mechanism part 11, metering valves 17, 18 are brought into contact with and separated from metering part seats 15, 16 formed in air passages 13, 14. Here, an O ring 22 is inserted into a cavity part 21 generated in an opening part retightening part of the case 2, so that corrosion resistance is improved by preventing infiltration of water.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an idle rotation control device that automatically controls the idle rotation speed of an automobile to a set rotation speed with respect to water temperature or outside air temperature, and is particularly applicable to an automobile engine. This is suitable as an actuator for electronic control.

[Conventional technology]

The idle speed of the car depends on the water temperature and load.

An automatically controlled actuator is disclosed, for example, in Japanese Patent Laid-Open No. 56-116967, but this device does not have a means for preventing water intrusion, and its corrosion resistance is somewhat inferior.

[Problem to be solved by the invention]

As mentioned above, in the above conventional technology, there is no water intrusion prevention means inside the coil, so the connector and yoke inside the coil will rust due to the intrusion of water or salt water, and the rust will propagate through the inside of the mold, causing a short circuit. There was a problem.

The purpose of the present invention is to prevent the intrusion of water and salt water, prevent the occurrence of rust, and improve corrosion resistance.

[Means to solve the problem]

In order to achieve the above object, an O-ring is inserted into a gap created between an exterior mold housed in a case with one end open and a caulking portion of the opening of the case.

When a plastic sealant or the like is used instead of an O-ring, the application process takes time, resulting in poor efficiency.

[Effect]

An idle rotation device with a ring inserted between the case of the caulking part and the solenoid can prevent water intrusion and improve corrosion resistance. Thereby, in the idle rotation device, the coil will not be short-circuited due to water intrusion in the internal mechanism.

〔Example〕

In explaining one embodiment of the present invention, a conventional example will be explained based on FIG. 1 in order to more easily understand the invention.

In FIG. 1, reference numeral l denotes an electromagnetic mechanism section, which houses a cylindrical coil 3 in a cylindrical case 2 with an open end, and a core 4 and a plunger 5 are arranged in the center of the coil 3. It is set up.

On the other hand, coil 3. An exterior mold 10 in which a terminal 6.7 for supplying electrical input to the coil 3 and a yoke 8.9 forming a magnetic circuit are integrally molded from a plastic material is crimped and fixed through the opening of the case 2.

Reference numeral 11 denotes a flow control mechanism section, which has a body 12 as its main element, and has air passages 13 and 14 formed inside the body 12, and metering section sheets 15 and 16 formed in each passage.

A metering valve 17,18 is interposed in the seat 15,16, one end of which is supported in the electromagnetic mechanism 1, and the other end supported in the valve guide 20 via a spring 19.

In the above configuration, when a desired electrical input is applied to the coil 3 via the terminal 6.7, an electromagnetic force corresponding to the input is generated, and the plunger 5 is moved in the right direction in the figure.
Then, the valves 17 and 18 in contact with the plunger 5 move to the right against the force of the spring 19, and the valve 1 moves to the right at a position where the electromagnetic force and the force of the spring 19 are balanced.
7°18 stops. The amount of air flowing therethrough is controlled by the opening areas of the valves 17, 18 and the seats 15, 16 at that time.

In an idle rotation control device that controls the idling rotation speed of an automobile engine using this amount of air, as shown in Fig. 2,
Generally, when the opening of the case 2 is tightened, a gap 21 is likely to be formed as shown in FIG. 2, and water or salt water may infiltrate through the gap 21. If salt water enters from here, rust will occur on the yokes 8 and 9, and the rust will be removed from the exterior mold 10.
The yoke 8, 9 and the terminal 6.7 are connected by rust, which may cause a serious accident such as a short circuit. Especially due to the melting of snow on the roads, as seen in many parts of Europe.

In areas where large amounts of rock salt are sprinkled, salt damage is more common than expected, and measures to prevent salt water intrusion are extremely important.

The object of the present invention is to solve the above-mentioned problems by extremely simple means. FIG. 3 shows an embodiment of the present invention, and the same reference numerals as in FIGS. 1 and 2 indicate equivalents.

In FIG. 3, a ring 22 is inserted into a gap 21 created in the crimped opening of the case 2.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

By inserting an O-ring between the case of the caulking part and the solenoid, water intrusion can be prevented and corrosion resistance can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional idle rotation control device, FIG. 2 is a partially detailed view of a conventional case fastening section, and FIG. 3 is a partially detailed view showing an embodiment of the present invention. 1... Electromagnetic mechanism section, 2... Case, 3... Coil,
4... Core, 5... Plunger, 10... Exterior mold, '41 Figure 1. z diagram 3rd figure

Claims (1)

[Claims] 1. A core and a plunger are placed in the center of a cylindrical coil, and the solenoid, which is made of a plastic outer mold, is housed in a case with an open end, and the opening of the case is mechanically crimped and fixed. 1. An idle rotation control device comprising an electromagnetic mechanism section, characterized in that an O-ring is inserted into a gap formed between a case of the caulking section and a solenoid.