JPH0322895Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] "Industrial Application Field" This invention relates to an oil circulation structure for preventing malfunction due to deterioration caused by oil infiltration in a horizontal solenoid that is subject to oil splashing.

"Prior Art" As a conventional plunger type solenoid, there is one shown in FIG. 2, for example. A plunger 1a made of a magnetic material and having a cylindrical portion followed by a tapered portion 1t is slidably fitted to a guide 4 made of a non-magnetic material fitted into a core 2 made of a magnetic material. A tapered portion 1t of the plunger 1a faces a tapered hole portion 2t of the core,
A contact surface B is provided between the outer periphery of the plunger 1a and the end surface of the core 2 so as to face each other and come into contact with each other so that there is a gap between the tapered portion 1t and the tapered hole 2t at the left end of the plunger 1a. A non-magnetic shaft 1b is fixed to the tip of the plunger 1a, and is loosely fitted into the center hole 2b of the core 2 with a narrow gap. The plunger 1a and the shaft 1b fixed thereto will be referred to as a shaft and plunger 1.
A diameter-reduced shaft portion 1c at the tip of the shaft 1b is slidably fitted into an end bearing hole 2c provided in a shaft support protrusion 2d of the core 2 and protrudes to the outside. 1c is a part that moves forward and backward and acts as an output. Center hole 2 of core 2
At b, a spring 10 is provided between the core 2 and the shaft 1b in a direction that separates the plunger 1a and the core 2. A bobbin 6 on which a coil 7 is wound is fitted around the outer periphery of the core 2 and the guide 4 with a wave washer 11 interposed between the core 2 and the guide 4.
A synthetic resin cap 8 is fitted into the ends of the magnetic plate 5 and the guide 4 through non-magnetic shims 12, and a cylindrical magnetic cover 3 covering these is tightly caulked to the core 2 and the cap 8. It is being The space between the cap 8 and the cover 3 is sealed with an O-ring 9 interposed therebetween.

When the coil 7 is energized, a magnetic circuit such as plunger 1a→core 2→cover 3→plate 5→plunger 1a is formed. The plunger 1a is attracted toward the core 2 by such a magnetic circuit, moves to the left against the spring 10, and actually hits the core 2 at the plane B.
and the plunger 1a collide. When the coil 7 is de-energized, the force of the spring 10 becomes stronger and the plunger 1a moves away from the core 2 due to a decrease in magnetic force due to a decrease in the energizing voltage.

``Problems to be solved by the invention'' However, in such a conventional solenoid structure, only the bearing gap between the end bearing hole 2c of the shaft at the tip of the core 2 and the reduced diameter shaft portion 1c is internal. Since the oil was in communication with the outside, the oil that had been scattered into the end bearing hole 2c of the shaft was caused to flow between the end bearing hole 2c and the reduced diameter shaft portion 1c due to negative pressure and capillary action caused by the movement of the shaft and plunger 1.
The problem is that if the coil 7 is exposed to the high temperature when the coil 7 is energized with no outlet, it will deteriorate, increase viscosity and solidify, causing malfunction of the shaft and plunger 1. It was hot.

This invention was made in view of these conventional problems, and aims to provide a solenoid in which oil that has entered the solenoid does not remain there for a long period of time under high temperatures when the coil 7 is energized.

[Structure of the idea]

``Means for solving the problem'' This invention is a tapered plunger type horizontal solenoid with a shaft bearing hole on the front surface that receives oil splashing. A hole communicating with the inside is provided on the top side, and a gap is provided between the core and the shaft on the inside side of the hole provided on the top side of the shaft support protrusion, and a gap is provided between the core and the shaft on the top side of the shaft support protrusion of the core inside the shaft and the plunger. A hole is provided that passes through the rear end of the plunger and the front end on the shaft side from the contact surface of the plunger and the core from near the hole position, so that the front and rear of the outside of the inner core communicate on the top and bottom sides. This is a solenoid characterized by having a shape in which a part of the outer circumferential portion of the inner core is shaved off.

"Function" A solenoid placed in an environment where there is oil splash will have a hole through which the oil communicates with the inside of the top side of the shaft support protrusion.
It enters the inside through the holes that communicate with the inside of the core near the top end and bottom end of the front surface. Oil entering the inside through the hole communicating with the inside of the top side of the shaft support protrusion passes through the gap between the shaft and the inner core, flows into the space continuing between the contact surfaces of the plunger and the core, and passes through the hole penetrating the shaft and plunger. Flows to the rear of the plunger. The oil at the rear of the plunger also flows into the space between the plunger and the core contact surface when the plunger is retracted. The oil that enters the interior through the hole leading to the interior near the top end of the front face of the core flows into the space between the plunger and the contact surface of the core through the gap on the top side of the part of the outer periphery of the inner core that has been shaved off. . Due to the action of gravity, the oil inside the solenoid
The oil in the space between the plunger and the core contact surface passes through the gap on the bottom side of the part where a part of the outer periphery of the inner core has been scraped off, and the other oil flows directly from the hole near the bottom end of the core that communicates with the inside. leak. In addition, oil droplets enter from a hole communicating with the interior near the ground end of the core while being restricted by the spilled oil, but it flows out again.

"Example" This invention will be explained below based on the drawings.

FIGS. 1A and 1B are diagrams showing an embodiment of this invention. First, to explain the structure, the mutual relationship of the parts with the same names is the same as that shown in FIG. and plunger, 22 is a magnetic core, 3 is a magnetic cover, 4 is a non-magnetic guide, 5 is a magnetic plate, 6 is a bobbin, 7 is a coil, 8 is a synthetic resin cap, and 9 is a seal. 10 is a spring, 11 is a wave washer, and 12 is a non-magnetic shim, and the same parts as in FIG. 2 are given the same reference numerals.

Near the top end of the front surface of the core 22, near the bottom end, and on the top side of the shaft support protrusion 22d of the core,
In addition to providing holes 41, 43, and 42 communicating with the interior, respectively, the core 22 is provided on the inside side of the hole 42 communicating with the interior provided on the top side of the shaft support protrusion 22d.
A gap is provided between the shaft 21b and the shaft 21b so that the shaft 21b does not come into contact with the inner core 22. A through hole 45 is provided in the shaft and the plunger 21, passing from the vicinity of the hole 42 position to the rear end of the plunger 21a and the front end on the shaft 21b side with respect to the contact surface B between the core 22 and the plunger 21a.

The through hole 45 is a center hole 45a that stops halfway from the rear end of the plunger 21a to the shaft 21b;
A radial hole 45b that passes through the outside of the shaft 21b and the center hole 45a, which is provided at a position corresponding to the hole 42 in the retracted position of the shaft and the plunger 21;
The shaft 21 is lower than the contact surface B of the plunger 21a.
A plunger 21a is attached to the tapered portion 21t on the side closer to b.
A radial hole 45c passing through the outside and the center hole 45a.
It is divided into

As shown in FIG. 1B, part of the top and bottom circumferential portions of the inner core 22 are shaved off so that the front and back of the outside of the inner core 22 communicate with each other, and the gaps 44, 46 are provided.

When the oil is splashed, the oil mainly enters the core 22 through holes 41, 42, and 43 formed in the core 22. The oil that entered through the hole 41 is absorbed into the bobbin 6 and the guide 4.
and the core 22 through the top gap 44 between the core 22 and the core 22.
and flows into the space near the contact surface B of the plunger 21a, and the inside of the core 22 flows from the hole 41 into the hole 43.
flows towards and flows out. The oil that entered through the hole 42 flows from the gap between the shaft 21b and the core 22 to the space near the contact surface B between the core 22 and the plunger 21a, and also flows from the hole 45b through the through hole 45 in the shaft and plunger 21 to the rear of the plunger 21a. It flows into the space on the end side and the space near the contact surface B between the core 22 and the plunger 21a. The oil that has flowed into the space near the contact surface B and the space on the rear end side of the plunger 21a is caused by the back and forth movement of the shaft and the plunger 21 to cause the space near the contact surface B on the front end side of the plunger 21a and the space on the rear end side of the plunger 21a. Holes 45a, 45c in the part inside plunger 21a between
come and go through it. These flowing oils are finally discharged to the outside from the hole 43 through the bottom gap 46 between the bobbin 6 and the guide 4 and the core 22 due to the effect of gravity. Naturally, the amount of oil that enters through the hole 43 may be limited by the flow of oil from the top that is discharged from the hole 43.

[Effect of idea]

As explained above, according to this idea,
The configuration is a tapered plunger type horizontal solenoid with a shaft bearing hole on the front surface that receives oil splashing, with holes communicating with the inside near the top and bottom ends of the front face of the core and on the top side of the shaft support protrusion. , a gap is provided between the core and the shaft on the inside side of the hole provided on the top side of the shaft support protrusion, and a gap is provided between the shaft and the plunger from around the position of the hole provided on the top side of the shaft support protrusion of the core to the back of the plunger. Provide a hole that passes through the end and the front end on the shaft side from the contact surface of the plunger and core,
Furthermore, because the outer circumference of the inner core is partially shaved off so that the front and back of the outer side of the inner core communicate on the top and bottom sides, the same oil stays inside the solenoid for a long time, and when the solenoid is energized, This has the effect of preventing malfunctions of the shaft and plunger due to deterioration caused by exposure to high temperatures and increased stickiness or solidification.

[Brief explanation of the drawing]

FIG. 1A is a vertical sectional view showing an embodiment of the present invention;
FIG. 1B is a sectional view taken along the line AA in FIG. 1A, and FIG. 2 is a vertical sectional view showing an example of a conventional horizontal solenoid. 1... Shaft and plunger, 1a... Plunger, 1b... Shaft, 1c... Diameter reduction shaft part, 1t... Taper part, 2... Core, 2b... Center hole, 2c... End bearing hole, 2d...Shaft support protrusion, 2t...Tapered part, 3...Cover, 4
...Guide, 5...Plate, 6...Bobbin, 7
...Coil, 8...Cap, 9...O-ring,
DESCRIPTION OF SYMBOLS 10... Spring, 11... Wave washer, 12... Shim, 21... Shaft and plunger, 21a... Plunger, 21b... Shaft, 21t... Taper part, 22... Core, 22d
...Shaft support protrusion, 41, 42, 43...
Hole, 44... Gap, 45... Through hole, 45a...
Center hole, 45b... hole, 45c... hole, 46...
gap.

Claims (1)

[Scope of utility model registration request] In a tapered plunger type horizontal solenoid with a shaft bearing hole in the front that receives oil splashing,
Holes 41, 43, and 42 that communicate with the inside are provided near the top end of the front surface of the core 22, near the bottom end, and on the top side of the shaft support protrusion 22d, and holes 41, 43, and 42 communicating with the inside are provided on the top side of the shaft support protrusion 22d. A gap is provided between the core 22 and the shaft 21b, and the core 22 is provided between the shaft and the plunger 21.
Hole 42 provided on the top side of the shaft support protrusion 22d
A hole 45 is provided near the position to penetrate the rear end of the plunger 21a and the front end on the shaft 21b side of the contact surface between the plunger 21a and the core 22, so that the front and rear of the outside of the inner core communicate with each other on the top and bottom sides. A solenoid characterized by having a shape in which a part of the outer periphery of the inner core is shaved off.