JP7255145B2 - electromagnetic solenoid - Google Patents

Description

The present invention relates to an electromagnetic solenoid that linearly actuates a mover by an electromagnetic force acting from a stator when an excitation coil is energized.

As an electromagnetic solenoid (linear solenoid in the literature) having the above configuration, Patent Document 1 describes a technology provided with a mover that operates by transferring magnetic flux generated by energization of an excitation solenoid from a plurality of stators to the mover. It is

This patent document 1 describes a through hole for communicating the inside and the outside of the electromagnetic solenoid with respect to one of the plurality of stators (the third stator in the document).

Patent Literature 2 describes a technique for a shaft support structure that transmits the driving force of an electromagnetic solenoid (linear solenoid in the literature) to a valve body.

In the shaft support structure of Patent Document 2, a winding bush formed by winding a member into a cylindrical shape and having a gap formed between windings is attached to an insertion hole of a bearing that slidably supports the shaft. Techniques for forming breathing grooves are described.

JP 2015-84395 A Japanese Patent Application Laid-Open No. 2009-108902

For example, a structure comprising a cylindrical stator to which magnetism from an exciting solenoid acts, a mover disposed inside the stator, a shaft connected to the mover, and the shaft protruding outside the housing is assumed to be an electromagnetic solenoid. In the electromagnetic solenoid constructed in this manner, a communication hole is formed in the housing or the like to enable the discharge and intake of air and fluid in the space in which the stator is accommodated, in accordance with the actuation of the plunger.

As a configuration of the communication hole that enables the discharge and intake of air and fluid in this way, in the one described in Patent Document 1, in order to form the through hole in the stator, a processing process for forming the through hole is required, which is troublesome and leads to an increase in the cost of the electromagnetic solenoid.

In addition, the structure described in Patent Document 2 not only increases the number of parts because it requires a rolled bush, but also impairs the function of supporting the shaft because the rolled bush does not surround the entire circumference of the shaft. It was something that could be done.

For these reasons, there is a demand for an electromagnetic solenoid that can easily form a communication path connecting the internal space in which the mover is housed and the outside when the mover is actuated.

The characteristic configuration of the electromagnetic solenoid according to the present invention includes an excitation coil that generates an electromagnetic force when energized, a stator disposed inside the excitation coil and made of a cylindrical magnetic material centered on the axis, and the stator and a columnar mover made of a magnetic material, which is housed in the inner space of the inner space so as to move along the axis, and the mover coaxially with the axis of the mover so as to operate integrally with the mover and a shaft bearing for automatically slidably supporting the shaft. The shaft bearing is press-fitted and held in a hole formed in the center of a disc-shaped bearing holder, and the shaft is inserted through the shaft. An annular bearing body is provided, the bearing holder is disposed in contact with an outer end portion of the inner peripheral surface of the stator, and has a communication path that communicates the outside of the bearing holder with the inner space. at the point where The bearing holder is press-fitted and fixed to the inner peripheral surface of the stator so that the exposed surface of the stator perpendicular to the axial center and the outer surface of the bearing holder are flush with each other. May be.

According to this characteristic configuration, when the mover is actuated by energizing the exciting coil, the shaft connected to the mover is allowed to protrude or retract while being supported by the shaft bearing. As a result, fluid such as air and oil can be discharged or sucked through the communication path formed in the bearing holder. In particular, in this configuration, since the communicating passage is formed in the bearing holder, there is no need to process the casing.
Therefore, an electromagnetic solenoid is constructed which can easily form a communication path connecting the internal space in which the mover is accommodated and the outside when the mover is actuated.

As another configuration, the communication path may be formed between the outer peripheral edge of the bearing holder and the inner peripheral edge of the stator that forms the internal space.

According to this, for example, by forming a recess in a part of the outer peripheral edge of the bearing holder or by forming a recess in a part of the inner periphery of the outer end portion of the internal space, the inner space of the stator is processed. By fitting the bearing holder into the outer end, a communication path can be formed between the outer peripheral edge of the bearing holder and the inner periphery of the outer end of the stator.

As another configuration, the communication path may be formed by a cut-away portion obtained by removing a part of the outer peripheral edge of the bearing holder.

According to this, when the bearing holder is manufactured by, for example, press working, only by removing part of the outer peripheral edge of the bearing holder to form the cut portion, there is no need to separately perform processing for forming the communication path. A communicating path can be formed.

As another configuration, the shaft bearing has an annular shape surrounding the shaft, and the communication passage is formed in a concave shape by removing part of the inner circumference of a holding hole in which the shaft bearing is fitted in the bearing holder. May be.

According to this, when the bearing holder is pressed, for example, by simply removing a part of the outer periphery of the bearing holder in a concave shape, the bearing holder can be formed without special processing for forming the communication hole. A communicating hole can be formed between the inner circumference and the outer circumference of the shaft bearing.

FIG. 4B is a cross-sectional view of the electromagnetic solenoid with the plunger in the non-actuated position; FIG. 4 is a cross-sectional view of an electromagnetic solenoid with a plunger in an actuated state; FIG. 3 is a cross-sectional view of an electromagnetic solenoid in an exploded state; It is an external view of an electromagnetic solenoid. FIG. 2 is a cross-sectional view taken along line VV of FIG. 1; It is sectional drawing which shows the communicating hole of another embodiment (a).

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
[Basic configuration]
As shown in FIGS. 1 to 4, it comprises an exciting coil A, a yoke portion B (an example of a stator), and a housing C made of a resin material 8 that integrates the exciting coil A and the yoke portion B. , a plunger 11 (an example of a mover) that is housed in an internal space inside the yoke portion B so as to be movable along the axis X, and a shaft 12 to constitute an electromagnetic solenoid 100 .

In this electromagnetic solenoid 100, the plunger 11 is formed in a columnar shape centered on the plunger axis (which coincides with the axis X in FIG. 1), and the plunger 11 has a fitting hole formed coaxially with the plunger axis. An axial shaft 12 is fitted and connected to 11a. As a result, the plunger 11 and the shaft 12 are arranged coaxially with the axis X. As shown in FIG.

FIG. 1 shows an electromagnetic solenoid 100 that operates a spool S of a valve opening/closing timing control device (not shown) that hydraulically controls opening/closing timing (valve timing) of intake valves and exhaust valves of a vehicle engine. .

The spool S is biased by a spring (not shown) in the protruding direction (leftward in the figure). The spool S is arranged coaxially with the axis X, and the projecting end of the shaft 12 is brought into contact with the operated surface of the projecting end. As a result, when the electromagnetic solenoid 100 is not driven (the excitation coil A is not energized), the pressing force from the spool S moves the plunger 11 to the non-driving position shown in FIG. retained.

On the other hand, when the electromagnetic solenoid 100 is driven (energized to the exciting coil A), as shown in FIG. The valve opening/closing timing is set by operating the spool S to the position where the valve opening/closing timing control device controls the hydraulic oil.

In the following description, of the electromagnetic solenoid 100, when the electromagnetic solenoid 100 is driven, the downstream surface (right surface in FIGS. 1 and 2) of the plunger 11 in the operating direction (right side in FIGS. 1 and 2) will be referred to as the front surface. The surface on the upstream side in the operating direction, which is the surface on the opposite side, is called the rear surface.

[Details of the electromagnetic solenoid]
The excitation coil A has a coil 2 formed by winding a wire rod made of a good conductor such as a copper alloy around a bobbin 1 made of non-magnetic and insulating resin. A wire constituting the coil 2 is electrically connected to a terminal 3 inside a connector portion Ca formed integrally with the housing C. As shown in FIG.

As shown in FIGS. 1, 2 and 4, the housing C is integrally formed with a pair of support portions Cb projecting outward, and each support portion Cb has a hole through which a connecting bolt is inserted. formed.

As shown in FIG. 1, the yoke portion B is configured by combining a first yoke 5 made of a magnetic material such as iron and a second yoke 6 made of a magnetic material such as iron.

As shown in FIGS. 1 to 3, the first yoke 5 includes a first tubular portion 5a centered on the axis X, and a first side wall portion 5b arranged on the front side of the electromagnetic solenoid 100. , and a first outer wall portion 5c disposed at a position surrounding the outer side of the first cylindrical portion 5a. A first inner peripheral surface 5S is formed.

The second yoke 6 has a structure in which a second tubular portion 6a centered on the axis X and a second side wall portion 6b arranged on the rear surface side of the electromagnetic solenoid 100 are integrally formed. A second inner peripheral surface 6S centered on the axial center X is formed on the second cylindrical portion 6a.

The yoke portion B is arranged such that the first tubular portion 5a and the second tubular portion 6a are aligned in the direction along the axis X, and surrounds the first inner peripheral surface 5S and the second inner peripheral surface 6S. An exciting coil A is arranged at the position. Further, a housing C is configured by a resin material 8 that integrates the exciting coil A, the first yoke 5, and the second yoke 6 together.

A circular cross-sectional shape centered on the axis X is provided in a region surrounded by the first tubular portion 5a and the second tubular portion 6a (a region facing the first inner peripheral surface 5S and the second inner peripheral surface 6S). An internal space is formed. A ring-shaped bush 7 made of a magnetic material is fitted in the inner circumference of the second tubular portion 6a. The bush 7 constitutes a plunger bearing E, which will be described later, and is arranged at an end position of the second tubular portion 6a adjacent to the first tubular portion 5a.

When the electromagnetic solenoid 100 is in a non-driving state (a state in which the exciting coil A is not energized), as shown in FIG. The positional relationship is such that the end faces 11f are aligned.

In the yoke portion B, the first yoke 5 and the second yoke 6 form a magnetic path. By reducing the thickness, the magnetic permeability of this portion is lowered. As a result, when the excitation coil A is energized, part of the magnetic flux formed across the first cylindrical portion 5a and the second cylindrical portion 6a leaks from the boundary into the internal space and reaches the plunger 11. The electromagnetic force resulting from this magnetic flux actuates the plunger 11 in the protruding direction.

The plunger 11 has a cylindrical shape as described above, and has a front end face 11f formed at the end near the front face of the housing C in the direction along the axis X, and a rear end face 11r formed at the other end. ing. The plunger 11 is formed with a tapered surface 11St having a slightly smaller diameter toward the outer surface 11S closer to the front end surface 11f (see FIG. 3).

A fitting hole 11a is formed in the plunger 11 coaxially with the plunger axis from the front end face 11f to the rear end face 11r. Further, the plunger 11 is formed with a supply/discharge hole 11b that is parallel to the fitting hole 11a. As a result, even when the proximal end of the shaft 12 is press-fitted into the fitting hole 11a, the front end face 11f and the rear end face 11r of the plunger 11 are kept in communication with each other through the supply/discharge hole 11b.

[Bearing structure]
As shown in FIGS. 1 to 5, the electromagnetic solenoid 100 includes a shaft bearing D that supports the protruding end of the shaft 12 so as to be slidable in the direction along the axis X, and the outer peripheral portion of the plunger 11. is slidably supported in the direction along the axis X. As a result, the plunger 11 and the shaft 12 are integrally guided along the axis X when the electromagnetic solenoid 100 is driven.

A plunger bearing E is formed by a bush 7 . In addition, a small gap is formed between the second inner peripheral surface 6S of the second yoke 6, which constitutes the yoke portion B, and the outer peripheral surface 11S of the plunger 11 (particularly, the smooth area 6Sa shown in FIG. 5). , the second inner peripheral surface 6S also functions to guide the plunger 11. As shown in FIG.

In this way, when the plunger 11 operates along the axis X in a state in which the plunger 11 is restrained from being displaced from the axis X by embracing the outer peripheral surface 11S of the plunger 11, allow movement of

The shaft bearing D is press-fitted into a hole formed in the center of a disk-shaped bearing holder 15 that is press-fitted into the outer end portion (inner peripheral edge) of the first inner peripheral surface 5S of the first yoke 5 on the front side of the housing C. It consists of an annular bearing body 16 that is retained and surrounds the shaft 12 .

The bearing body 16 is arranged at a position where it fits on the outer end side of the shaft 12 and is formed of a ring-shaped material with high wear resistance. A communication passage 21 is formed on the outer periphery of the bearing holder 15 to allow fluid to flow in and out between the inside and outside of the housing when the plunger 11 is actuated. Details of the communication path 21 will be described later. The bearing holder 15 and the bearing body 16 may be made of either a magnetic material or a non-magnetic material, but are preferably made of a non-magnetic material.

In particular, as shown in FIG. 5, a portion of the outer periphery of the bearing holder 15 of the shaft bearing D is linearly removed to form a cutout portion 15a, and the cutout portion 15a provides a space between the inner space and the outside of the housing C. A communication passage 21 is formed to allow fluid flow in the .

That is, by press-fitting the bearing holder 15 into the outer end portion of the first inner peripheral surface 5S of the first yoke 5 (stator), the outer periphery of the bearing holder 15 and the first inner peripheral surface 5S of the first yoke 5 are brought together. A communication path 21 is formed between That is, a plurality of cut portions 15a are formed by linearly removing portions of the outer peripheral edge of the bearing holder 15 at a plurality of locations (three locations in the embodiment) that are equally spaced in the circumferential direction.

It should be noted that the inner peripheral surface of the bush 7, the first inner peripheral surface 5S, and the second inner peripheral surface 6S may be formed with a hard layer such as nickel-phosphorus plating, or a fluororesin (eg, Teflon resin [trade name]). ), etc., a resin film having high heat resistance, chemical stability, and a low coefficient of friction may be formed.

[Action and effect of the embodiment]
Since the shaft 12 is supported by the shaft bearing D and the plunger 11 (moving element) is supported by the plunger bearing E, the plunger 11 and the shaft 12 are integrally aligned with the axis X when the electromagnetic solenoid 100 is driven. It is possible to operate linearly along the

In addition, in this configuration, the communicating passage 21 can be formed by a simple modification such as changing the mold used when processing a part of the outer peripheral edge of the bearing holder 15. For example, a hole is formed in the housing C. No separate processing such as

In addition, since the plurality of communication paths 21 are formed at regular intervals in the circumferential direction of the bearing holder 15, for example, a structure in which the bearing holder 15 is largely notched to form a single communication path 21 has a reduced strength. When the plunger 11 operates, the plunger 11 can be operated by sucking fluid such as air from a plurality of communicating passages 21 in the circumferential direction of the bearing holder 15 and by discharging the fluid such as air. Also, a biased load is not applied. Furthermore, since the communicating passages 21 are formed at regular intervals in the circumferential direction, even if the bearing holder 15 is fitted to the outer end portion of the first inner peripheral surface 5S of the first yoke 5, the bearing holder 15 is not aligned with the axis X. I can't lean against it.

[Another embodiment]
The present invention may be configured as follows other than the above-described embodiments (components having the same functions as those of the embodiments are given the same numbers and symbols as those of the embodiments).

(a) As shown in FIG. 6, a concave portion 15b is formed by removing a portion of the inner periphery of a holding hole 15H that internally fits and supports a bearing body 16 (shaft bearing D) in a bearing holder 15. form a communication passage 21 that allows fluid to flow between the interior space and the exterior of the housing C. As shown in FIG.

That is, the bearing body 16 has an annular shape surrounding the shaft 12, and concave portions 15b are formed at a plurality of locations (three locations in another embodiment) at equal intervals in the circumferential direction on the inner circumference of the holding hole 15H of the bearing holder 15. ing. The bearing body 16 (shaft bearing D) is press-fitted into the holding hole 15H of the bearing holder 15 of this structure and fixed. Thereby, a plurality of communication paths 21 are formed between the inner circumference of the bearing holder 15 and the outer circumference of the bearing body 16 .

As described above, in the alternative embodiment (a), the communication path 21 can be formed by a simple improvement such as changing the mold used when processing a part of the inner peripheral edge of the bearing holder 15. For example, the housing C There is no need for processing such as forming a hole in the In addition, in this configuration, the inner circumference of the bearing body 16 evenly contacts the entire circumference of the shaft 12, so the performance of guiding the shaft 12 is not lowered.

(b) In the embodiment, the cutout portion 15a is formed by linearly cutting out a part of the outer peripheral edge of the bearing holder 15. It may be formed by a curved line that projects outward, or a plurality of straight lines that are combined to project toward the center of the bearing holder 15 .

By setting the shape of the cutout portion 15a in this way, the communication path 21 can be formed without increasing the length of the cutout portion of the outer circumference of the bearing holder 15, compared to the configuration in which the straight cutout portion 15a is formed. can increase the cross-sectional area of

(c) In the configuration in which the communication path 21 is created by forming the concave portion 15b on the inner circumference of the holding hole 15H of the bearing holder 15 as in the other embodiment (a), the configuration described in the other embodiment (b). , or a plurality of straight lines that are combined so as to project in the outer peripheral direction of the bearing holder 15 .

By setting the shape of the concave portion 15b in this way, the cross-sectional area of the communicating passage 21 can be increased without increasing the length of the inner circumference of the bearing holder 15 that is removed.

INDUSTRIAL APPLICABILITY The present invention can be used for an electromagnetic solenoid that linearly operates a mover by an electromagnetic force acting from a yoke when an excitation coil is energized.

A Exciting coil B Yoke part (stator)
D shaft bearing 11 plunger (moving element)
12 Shaft 15 Bearing holder 15H Holding hole 16 Bearing body (shaft bearing)
15a Cutaway portion 21 Communicating path X axis center

Claims (5)

an exciting coil that produces electromagnetic force when energized;
a cylindrical stator centered on the axis and made of a magnetic material, the stator being arranged inside the excitation coil;
a columnar mover made of a magnetic material, which is accommodated in the inner space of the stator so as to be movable along the axis;
a shaft provided on the mover coaxially with the axis of the mover so as to operate integrally with the mover;
and a shaft bearing that slidably and automatically supports the shaft,
The shaft bearing has an annular bearing body that is press-fitted and held in a hole formed in the center of a disk-shaped bearing holder and through which the shaft is inserted,
The bearing holder is arranged in contact with the outer end portion of the inner peripheral surface of the stator,
An electromagnetic solenoid provided with a communication path that communicates the outside of the bearing holder with the internal space. The bearing holder is press-fitted and fixed to the inner peripheral surface of the stator so that the exposed surface of the stator perpendicular to the axial center and the outer surface of the bearing holder are flush with each other. 2. The electromagnetic solenoid of claim 1. 3. The electromagnetic solenoid according to claim 1 , wherein the communicating path is formed between the outer peripheral edge of the bearing holder and the inner peripheral edge of the stator forming the internal space. 4. The electromagnetic solenoid according to claim 3 , wherein the communication path is formed by a cut-away portion obtained by removing a part of the outer peripheral edge of the bearing holder . the shaft bearing is annular surrounding the shaft;
3. The electromagnetic solenoid according to claim 1 , wherein the communication path is formed in a concave shape by removing part of the inner periphery of a holding hole in which the shaft bearing is fitted in the bearing holder.

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