Solenoid, solenoid valve, and shock absorber

Patent metadata

Field	Value
Publication number	US-12196288-B2
Application number	US-202017626710-A
Country	US
Kind code	B2
Filing date	Sep 2, 2020
Priority date	Sep 9, 2019
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A solenoid includes a first fixed iron core and a second fixed iron core located on a first end side and a second end side of an axial direction of a coil, a first movable iron core and a second movable iron core located therebetween and attracted by the first fixed iron core and the second fixed iron core by passage of current through the coil, respectively, a spring that biases the first movable iron core to the second fixed iron core side, a leaf spring that regulates movement of the first movable iron core to the second fixed iron core side with respect to the second movable iron core, and a communication passage that causes the first fixed iron core side of the second movable iron core to communicate with the second fixed iron core side.

First claim

The invention claimed is:

1. A solenoid comprising:
a coil;
a first fixed iron core located on a first end side of an axial direction of the coil;
a second fixed iron core located on a second end side of the axial direction of the coil with a gap with the first fixed iron core;
a first movable iron core disposed between the first fixed iron core and the second fixed iron core and attracted by the first fixed iron core by passage of current through the coil;
a second movable iron core disposed between the first fixed iron core and the second fixed iron core and attracted by the second fixed iron core by the passage of current through the coil;
a spring that biases the first movable iron core to the second fixed iron core side;
a regulating part that regulates movement of the first movable iron core to the second fixed iron core side with respect to the second movable iron core;
a communication passage that causes the first fixed iron core side to communicate with the second fixed iron core side of the second movable iron core; and
an annular filler ring interposed between the first fixed iron core and the second fixed iron core,
wherein the first movable iron core includes an inner tubular portion and an outer tubular portion that are doubly disposed inside and outside, a connecting portion connecting first ends of an axial direction of the inner tubular portion and the outer tubular portion, and an inner bottom portion located at a second end of the inner tubular portion, and is slidably inserted into the filler ring with the inner bottom portion directed to the second fixed iron core side,
the second movable iron core is tubular with a bottom and includes an outer bottom portion and an intermediate tubular portion standing on an outer circumference edge of the outer bottom portion and having an inner diameter larger than an outer diameter of the inner tubular portion, and the intermediate tubular portion is slidably inserted into the outer tubular portion with the outer bottom portion directed to the second fixed iron core side, and
the spring is interposed between the inner bottom portion and the first fixed iron core with a first end side inserted into the inner tubular portion.

2. The solenoid according to claim 1 , wherein
the communication passage is formed in the outer bottom portion and open between the outer bottom portion and the inner bottom portion, and communicates with space formed on the first fixed iron core side of the outer tubular portion via a gap formed between the outer tubular portion and the inner tubular portion.

3. The solenoid according to claim 2 , wherein
the first movable iron core includes a guide portion located at an outer circumference of a tip of the inner tubular portion protruding outward from the outer tubular portion and in sliding contact with an inner circumference of the filler ring, and
an outer diameter of the inner tubular portion is smaller than an inner diameter of the outer tubular portion.

4. The solenoid according to claim 1 , wherein
the communication passage is formed in the outer bottom portion and opens between the outer bottom portion and the inner bottom portion, and communicates with space formed on the first fixed iron core side of the outer tubular portion via a communication hole formed in the inner bottom portion and a gap formed between a tip of the inner tubular portion and the first fixed iron core.

5. The solenoid according to claim 1 , wherein
as the communication passage, a first communication passage formed in the outer bottom portion and opens between the outer bottom portion and the inner bottom portion, and a second communication passage formed between the second movable iron core and the filler ring and opens into space formed on the first fixed iron core side of the outer tubular portion are provided.

6. A solenoid comprising:
a coil;
a first fixed iron core located on a first end side of an axial direction of the coil;
a second fixed iron core located on a second end side of the axial direction of the coil with a gap with the first fixed iron core;
a first movable iron core disposed between the first fixed iron core and the second fixed iron core and attracted by the first fixed iron core by passage of current through the coil;
a second movable iron core disposed between the first fixed iron core and the second fixed iron core and attracted by the second fixed iron core by the passage of current through the coil;
a spring that biases the first movable iron core to the second fixed iron core side;
a regulating part that regulates movement of the first movable iron core to the second fixed iron core side with respect to the second movable iron core;
a communication passage that causes the first fixed iron core side to communicate with the second fixed iron core side of the second movable iron core; and
an annular filler ring interposed between the first fixed iron core and the second fixed iron core,
wherein the first movable iron core includes an inner tubular portion and an outer tubular portion that are doubly disposed inside and outside, a connecting portion connecting first ends of an axial direction of the inner tubular portion and the outer tubular portion, and an inner bottom portion located at a second end of the inner tubular portion, and is slidably inserted into the filler ring with the inner bottom portion directed to the second fixed iron core side,
the second movable iron core is tubular with a bottom and includes an outer bottom portion and an intermediate tubular portion standing on an outer circumference edge of the outer bottom portion and having an inner diameter larger than an outer diameter of the inner tubular portion, and the intermediate tubular portion is slidably inserted into the outer tubular portion with the outer bottom portion directed to the second fixed iron core side, and
the spring is interposed between the inner bottom portion and the first fixed iron core with a first end side inserted into the inner tubular portion.

7. A solenoid valve including the solenoid according to claim 1 and provided partway in a pressure control passage, further comprising:
a valve body that opens and closes the pressure control passage,
wherein the solenoid applies, to the valve body, force to attract the second movable iron core to the second fixed iron core side in a direction of closing the pressure control passage, the force being generated when the current is passed through the coil.

8. A shock absorber including the solenoid valve according to claim 7 , further comprising:
a cylinder;
a rod movably inserted into the cylinder in the axial direction;
a main passage through which liquid flows when the cylinder and the rod move relatively in the axial direction;
a main valve body that opens and closes the main passage;
a pressure introduction passage that is provided with an orifice partway and reduces and leads pressure upstream of the main valve body in the main passage to a back surface of the main valve body; and
the pressure control passage connected downstream of the orifice of the pressure introduction passage and provided with the solenoid valve.

Assignees

• Kyb Corp

Inventors

• Kobayashi Yoshifumi
• Abe Tomoyasu
• Furuta Yuusuke
• Danshita Naoaki
• Doi Kohei
• Iyatani Masatoshi

Classifications

• H01F2007/086

  Structural details of the armature · CPC title

• H01F7/16

  Rectilinearly-movable armatures (H01F7/17 takes precedence) · CPC title

• H01F7/081

  Magnetic constructions · CPC title

• F16K31/0655

  Lift valves · CPC title

• F16F2234/02

  cylindrical · CPC title