JP2013087876A - Spool valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spool valve which has excellent productivity and allows axial dimension reduction.SOLUTION: A sliding hole 2 having a right end blocked is provided at an axial center of a spool 1. A shaft 3 is inserted and arranged inside the sliding hole 2. An inside space of the sliding hole 2 which is partitioned by the shaft 3 is provided with a F/B chamber α. When an output oil pressure rises, an oil pressure in response to a diameter of the sliding hole 2 (diameter of the shaft 3) acts on the bottom of the sliding hole 2 to produce an F/B force toward the right in the spool 1. As a result, a displacement of the spool 1 is stabilized to suppress a fluctuation of the output oil pressure. Because the F/B chamber α is provided inside the spool 1, the need for providing a small diameter land conventionally employed can be eliminated, so that a spool 1 having no land difference can be provided. Therefore, the spool 1 and sleeve 4 can be improved in productivity. The elimination of conventionally employed small diameter land leads to a decrease in the axial dimension of a spool valve 8.

Description

  The present invention relates to a spool valve in which a feedback force according to an increase in output hydraulic pressure is applied to a spool.

In the following specification, for convenience of explanation, the moving direction (axial direction) of the spool is referred to as the left-right direction. For example (see FIG. 1). This left-right direction is for explanation, and does not limit the actual mounting direction.
In the following specification, feedback is referred to as F / B.

An example of the spool valve 8 will be described with reference to FIG. In addition, the code | symbol (code | symbol of FIG. 2) used for this background art attaches | subjects the same code | symbol to the same function thing as [the form for inventing] and [Example] which are mentioned later.
FIG. 2 shows a cross section of a normally closed (normally closed: hereinafter referred to as N / C) type spool valve 8 as a specific example, and a linear solenoid 9 (an example of driving means) as a driving source. (For example, see Patent Documents 1 and 2).

  The spool valve 8 includes an F / B chamber α that pushes the spool 1 to the right side by an increase in output hydraulic pressure (hydraulic pressure generated at the output port P2). When the output hydraulic pressure is applied to the F / B chamber α, “F” corresponding to a land difference (area difference due to a step) between “first large-diameter land R1 on the right side of F / B chamber α” and “small-diameter land (F / B land) X on the left side of F / B chamber α”. / B force (force for urging the spool 1 to the right) "occurs.

As described above, in the conventional technique, the F / B force is generated by the land difference between the first large-diameter land R1 and the small-diameter land X.
Therefore, it is necessary to provide the first large-diameter land R1 and the small-diameter land X having different outer diameters in the spool 1, and in the sleeve 4 (the valve body in Patent Document 2) that slidably supports the spool 1. However, it is necessary to perform step processing corresponding to the first large-diameter land R1 and the small-diameter land X, and the productivity of the spool 1 and the sleeve 4 is deteriorated.
Further, in the prior art, since the small-diameter land X is required to obtain the F / B chamber α, there is a problem that the axial dimension of the spool valve 8 becomes long.

JP 2006-046640 A JP 2008-077575 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a spool valve that is excellent in productivity and capable of shortening the axial dimension.

[Means of claim 1]
According to the first aspect of the present invention, the F / B chamber is provided in the internal space of the sliding hole defined by the shaft (the axial hole formed in the spool extending in the axial direction). That is, an F / B chamber is provided inside the spool.
Thereby, since the small-diameter land used in the prior art can be eliminated, it is not necessary to provide lands having different diameter differences on the spool. Further, the inside of the valve body (including the sleeve) does not need to be stepped corresponding to lands having different diameter differences. For this reason, productivity of a spool and a valve body (including a sleeve) can be increased.
Furthermore, since the small-diameter land used in the prior art can be eliminated, the axial dimension of the spool valve can be shortened.

[Means of claim 2]
The shaft according to claim 2 is provided separately from the adjuster screw and is pressed against and brought into contact with the adjuster screw by the hydraulic pressure generated in the F / B chamber.

It is sectional drawing of an electromagnetic spool valve (Example). It is sectional drawing of an electromagnetic spool valve (conventional example).

[Description of Embodiments] [Mode for carrying out the invention] will be described with reference to the drawings.
Inside the spool 1, there is provided a sliding hole 2 whose one end extending in the axial direction is closed.
A shaft 3 that is supported by the sliding hole 2 so as to be slidable in the axial direction is inserted and disposed in the sliding hole 2.
The shaft 3 is supported by an adjustment task screw 5 that is screwed into a sleeve (an example of a valve body) 4.
Further, an F / B port 6 for supplying output hydraulic pressure to the internal space of the slide hole 2 defined by the shaft 3 is formed in the spool 1, and the F / B is provided in the internal space of the slide hole 2 defined by the shaft 3. A chamber α is provided.

A specific example (example) to which the present invention is applied will be described with reference to the drawings. The following examples show specific examples, and it goes without saying that the present invention is not limited to the examples.
In the following embodiments, the same reference numerals as those in the “DETAILED DESCRIPTION OF THE INVENTION” denote the same functional objects.

In this embodiment, the present invention is applied to a spool valve 8 in an electromagnetic spool valve 7. The electromagnetic spool valve 7 is formed by coupling a spool valve 8 and a linear solenoid 9 that drives the spool valve 8 in the axial direction.
Although the application of the electromagnetic spool valve 7 is not limited, in this embodiment, an electromagnetic hydraulic control valve used in a hydraulic control device for an automatic transmission for a vehicle is shown as a specific example.

The spool valve 8 is N / C type,
A sleeve 4 having a substantially cylindrical shape;
A spool 1 that is slidably supported in the axial direction inside the sleeve 4;
A return spring 10 that biases the spool 1 to the right side (the side on which the linear solenoid 9 is disposed);
It is configured with.

Sleeve 4 has
・ Input port P1, which receives supply of pump hydraulic pressure (input hydraulic pressure),
An output port P2 communicating with a control hydraulic pressure supply destination (such as a friction engagement device of an automatic transmission) via an oil passage;
A discharge port P3 communicating with the low pressure space (in the oil pan or the like) is provided.
Each of these ports is a through hole formed through the inside and outside of the sleeve 4 in the radial direction, and is arranged in the order of the input port P1, the output port P2, and the discharge port P3 from the left side to the right side of the sleeve 4. Yes.

In spool 1,
A first large-diameter land R1 that adjusts the opening degree of the input port P1,
A second large-diameter land R2 that adjusts the opening degree of the discharge port P3 is provided.
A distribution chamber communicating with the output port P2 is formed around the small-diameter shaft portion between the first large-diameter land R1 and the second large-diameter land R2.
The positional relationship between the input port P1 and the first large-diameter land R1 and the positional relationship between the discharge port P3 and the second large-diameter land R2 (positional relationship including notches and the like) are set so that N / C is achieved. Has been.

The return spring 10 is a compression coil spring spirally formed in a cylindrical shape, and generates a spring force that biases the spool 1 to the right against the driving force of the linear solenoid 9.
An adjust screw 5 is screwed to the left end of the sleeve 4, and a return spring 10 is disposed in a compressed state in a spring chamber between the adjust screw 5 and the spool 1. The adjustment task screw 5 is prevented from rotating around the sleeve 4 by caulking, adhesive, or the like after adjustment of the spring load.

  The linear solenoid 9 is a well-known electromagnetic actuator which is coupled to the right end of the sleeve 4 and displaces the spool 1 to the left side in the figure against the urging force of the return spring 10 by a magnetomotive force corresponding to the energization amount. The structure is not limited.

  The linear solenoid 9 is controlled by an electronic control device (AT-ECU or the like) (not shown). This electronic control device controls the drive current applied to the linear solenoid 9 by duty ratio control or the like, thereby controlling the position of the spool 1 in the axial direction to open / close each port and adjust the degree of communication. To generate a desired output hydraulic pressure.

Further, the spool valve 8 of this embodiment is provided with an F / B chamber α that applies an F / B force to the spool 1 in accordance with an increase in the output hydraulic pressure generated at the output port P2.
The F / B chamber α of this embodiment is provided inside the spool valve 8.

  Inside the spool 1, there is provided a sliding hole 2 whose one end (right end in FIG. 1) extending in the axial direction is closed. The sliding hole 2 is a drill hole drilled from the left end of the spool 1 toward the right side of the spool 1, and is formed in the shaft center of the spool 1. Although not limited, as a specific example, the bottom of the sliding hole 2 (the deep end of the drill hole) is provided so as to reach the middle of the small diameter shaft portion or the inside of the second large diameter land R2. ing.

Inside the sliding hole 2, a shaft 3 is inserted and arranged so as to be slidable in the axial direction by the inner peripheral wall of the sliding hole 2. The shaft 3 is a cylindrical body, and is provided with a length that does not come out of the sliding hole 2 even when the spool 1 is stopped at the right end (the energization stop state of the linear solenoid 9).
The left side of the shaft 3 is exposed to the spring chamber, and the left end of the shaft 3 comes into contact with the adjustment task screw 5. The shaft 3 of this embodiment is provided separately from the adjuster screw 5 and is pressed against the adjuster screw 5 by the hydraulic pressure generated in the F / B chamber α to restrict axial movement. is there.

An internal space of the sliding hole 2 defined by the shaft 3 is an F / B chamber α, and an internal space (F / B chamber α) of the sliding hole 2 partitioned by the shaft 3 is provided in the small diameter shaft portion of the spool 1. ) Is provided with an output hydraulic pressure (distribution chamber hydraulic pressure).
In the F / B chamber α, the applied hydraulic pressure increases as the output hydraulic pressure increases. Then, hydraulic pressure corresponding to the diameter of the sliding hole 2 (diameter of the shaft 3) acts on the bottom of the sliding hole 2 (the deep end of the drill hole), and a rightward axial force (F / B force) is applied to the spool 1. Occur. Thereby, the displacement of the spool 1 is stabilized, and the fluctuation of the output hydraulic pressure of the output port P2 can be suppressed.
The movement of the spool 1 is stopped when the “spring force + F / B force” and the “solenoid driving force” are balanced.

(Effect of Example 1)
The spool valve 8 of this embodiment is provided with the F / B chamber α inside the spool 1 as described above. For this reason, the small-diameter land X (symbol, see FIG. 2) used in the prior art can be eliminated, and there is no need to provide the spool 1 with lands having different diameter differences. Further, it is not necessary to perform step processing corresponding to lands having different diameter differences in the sleeve 4. For this reason, productivity of the spool 1 and the sleeve 4 can be improved.
Furthermore, in this embodiment, since the small-diameter land X used in the prior art can be eliminated, the axial dimension of the spool valve 8 can be shortened.

  In the above embodiment, the spool valve 8 using the sleeve 4 (cylindrical member) is shown. However, the spool valve 8 is not limited to the one using the sleeve 4, and the spool 1 is used as a member in which an oil passage is formed. The present invention may be applied to the spool valve 8 using a valve body (bubble housing) in which the sliding hole 2 to be inserted is directly formed.

  In the above embodiment, the linear solenoid 9 (electromagnetic actuator) is used as an example of the means for driving the spool valve 8. However, the driving means for the spool valve 8 is not limited, and the spool 1 is adjusted by adjusting the pilot hydraulic pressure. Other driving means such as a means for driving the spool 1 or a means for driving the spool 1 using a piezoelectric actuator may be used.

  In the above embodiment, the example in which the present invention is applied to the spool valve 8 used in the hydraulic control device of the vehicle automatic transmission has been described. However, the present invention is applied to the spool valve 8 other than the automatic transmission. Also good.

1 Spool 2 Sliding hole 3 Shaft 4 Sleeve 5 Adjustable screw 8 Spool valve α F / B chamber

Claims (2)

In the spool valve (8) having a feedback chamber (α) that gives the spool (1) a feedback force according to the increase in the output hydraulic pressure,
Inside the spool (1) is provided a sliding hole (2) closed at one end extending in the axial direction,
Inside the sliding hole (2), a shaft (3) supported to be slidable in the axial direction by the sliding hole (2) is inserted and arranged.
The spool valve, wherein the feedback chamber (α) is provided by an internal space of the sliding hole (2) defined by the shaft (3). Spool valve (8) according to claim 1,
The spool valve according to claim 1, wherein the shaft (3) abuts on an adjust screw (5) that is screwed into a sleeve (4) that slidably supports the spool (1) in the axial direction.

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