JP3389030B2 - Hydraulic control valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control valve in which a spool having a plurality of lands is inserted in a valve body.

[0002]

2. Description of the Related Art As a hydraulic control valve, for example, there is a hydraulic control valve 10 shown in FIG. 4, in which one end of a spool 10 _SP having a plurality of lands is pressed by a spring S so that a valve body 10B.
It was inserted in. The hydraulic control valve 10 inputs the source pressure P _in to the source pressure circuit 2a and the feedback pressure circuit 2b,
Based on the signal pressure P _S from the signal pressure circuit 4 and the pressing force of the spring S, the spool 10 _SP converts the source pressure P _in from the source pressure circuit 2a into the pressing force of the signal pressure P _S and the spring S. The pressure is adjusted by moving in the opposite direction, the oil is discharged from the output circuit 3a or the output circuit 3a and the drain circuit 3b, and the source pressure P _in is adjusted.

[0003]

However, in such a hydraulic control valve, since the spool 10 _SP has a shape having a plurality of lands, for example, as shown in FIG.
Since the closed circuit C may be formed between 0 _SP and the valve body 10B, the residual oil in the closed circuit C prevents the operation of the control valve.

Therefore, regarding the residual oil in the closed circuit, it is necessary to form a return circuit in the hydraulic control valve and let the residual oil escape to the outside from this return circuit.

However, the above-mentioned return circuit needs to be designed in consideration of the viscous resistance of oil for the purpose thereof, and in particular, when the diameter of the return circuit is reduced, a certain limitation occurs ( Generally, the diameter of the return circuit should be 3.5 mm or more). Therefore, for example, in the closed circuit C existing at the position shown in FIG. 4, a problem occurs when the return circuit is provided at the position of the closed circuit C.

As a measure against this, first, the outer diameter of the land is made smaller so that the closed circuit is communicated with the return circuit disposed farther than the closed circuit from the gap between the land and the valve body. Can be considered. However, when inserting the spool into the valve body,
For example, as the land diameter is reduced, the spool rattles in the valve body, resulting in inconvenience of assembling workability.

Further, as shown in FIG. 5 (a), conventionally, there is also one in which an axial communication hole H is provided in the land L _c of the spool 10 _SP to open the closed circuit C, but in FIG. 5 (b). as shown in cross-section, in the case of processing the communication hole H to the land L _c, since the difference in level of the land L _c is a constant accuracy is required on narrow, cause another disadvantage that production cost is increased Will end up.

The present invention has been made in view of these facts, and the residual oil of the closed circuit formed between the spool and the valve body is formed without deteriorating the assembling workability and increasing the production cost. It is an object of the present invention to provide a hydraulic control valve capable of releasing the oil.

[0009]

According to the invention, claim 1
The hydraulic control valve, which is related to the
The spool that regulates the original pressure from the circuit and the valve body
Sleeve, which is inserted while it is positioned inside the
Connect the sleeve and the spool, and push on the spool.
The spring that exerts pressure and the spring
Inserted in the sleeve, and from the signal pressure circuit to the spool
The signal pressure of is applied in the same direction as the pressing force of the spring.
Of the land of the plug and the spool, the
The land on which the bees act and the closing formed by this land
Oil remaining in the same circuit from the return circuit to the oil reservoir
In the spool axis direction on the outer peripheral surface of the land so that it escapes.
And a notch formed along the cutout .

A hydraulic control valve according to a second aspect of the present invention is the hydraulic control valve according to the first aspect, characterized in that the notches are formed on both sides in the radial direction of the land.

[0011]

According to the present invention, the hydraulic control valve according to claim 1 is mounted in the valve body , and the hydraulic pressure is supplied from the hydraulic circuit.
Spool for adjusting pressure and positioning inside the valve body
The sleeve that is inserted in the
Connect the spool and apply a pressing force to the spool.
And a spring that fits inside the sleeve.
The signal pressure from the signal pressure circuit is input to the spool.
A plug that acts in the same direction as the pressing force of the spring,
Of the lands of the spool, the spring on which the spring acts
And remained in the closed circuit formed by this land
Be sure to let the oil escape from the return circuit to the oil reservoir.
It is formed along the spool axial direction on the outer peripheral surface of the land.
Since the notch is provided, even if the closed circuit described above is formed in a place where it is difficult to provide a return circuit, the residual oil in the closed circuit can be removed without deteriorating the workability of assembly and increasing the production cost. It can be released to the outside, ensuring smooth operation of the hydraulic control valve.

In the hydraulic control valve according to a second aspect of the present invention, since the cutouts are formed on both sides of the land in the radial direction in the first aspect, the closed circuit and the return circuit are communicated with each other. Is easier to process, which is even more effective in suppressing production costs.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
A detailed description will be given based on the attached drawings. Figure 1 shows automatic
It is a circuit diagram showing a part of the hydraulic circuit of the speed machine, the present invention
The regulator valve 1 is a clutch regulator valve 2
Output pressure P from 0_inTo the source pressure circuit 2a
And the signal pressure P from the signal pressure circuit 4
_sAnd spool 1 based on the pressing force of spring S_SPAxis
Pressure is adjusted by moving in the direction
a, or oil from the output circuit 3a and drain circuit 3b
Is discharged, and the original pressure P_inIs to regulate the pressure.

[0014] Figure 2 is a cross-sectional view showing a regulator valve 1 in detail, one inserts the plug 1 _PL sleeve 1 _SL which is positioned by a retainer plate 1 _RP, via the sleeve 1 _SL spring S Inserted in the valve body 1B while being connected to the spool 1 _SP . At this time, the external pressure P _o acts on the side surface of the sleeve 1 _SL .

The regulator valve 1 for inputting the source pressure P _in from the source pressure circuit 2a acts the working pressure P _f from the feedback pressure circuit 2b in the direction opposite to the pressing force of the spring S, and at the same time, the signal pressure circuit 4 The signal pressure P _S from P is applied to the plug 1 _PL in the same direction as the pressing force of the spring S. That is, the spool 1 _SP is axially moved to a position where the pressing force of the spring S, the working pressure P _f from the feedback pressure circuit 2 b, and the signal pressure P _S from the signal pressure circuit 4 are balanced, and the output circuit 3 a. , Or the oil is discharged from the output circuit 3a and the drain circuit 3b to regulate the source pressure P _in .

By the way, in such a regulator valve, for example, by the land L _{c on} which the spring S acts, the spool 1
_A closed circuit C may be formed between the _SP and the valve body 1B. For this reason, the operation of the regulator valve 1 is blocked by the residual oil in the closed circuit C.

Therefore, the return circuit X is provided at a position farther than the closed circuit C, and the oil remaining in the closed circuit C is released from the return circuit X to an oil reservoir (not shown). That is, when the closed circuit C is formed between the spool 1 _SP and the valve body 1B, the land L _{C of the} spool 1 _SP is arranged so that the closed circuit C communicates with the return circuit X located farther than the circuit _C. A notch is formed on the outer peripheral surface along the spool axis direction.

As a result, the closed circuit C and the return circuit X arranged far from the circuit C communicate with each other through the notch gap formed on the outer peripheral surface of the land L _c , and the closed circuit C is formed.
The residual oil inside can be escaped from the return circuit X.
Therefore, even if the closed circuit C is in a place where it is difficult to provide the return circuit X, the residual oil in the closed circuit C can be released to the outside without deteriorating the workability of assembly and increasing the production cost. 1 does not deteriorate the responsiveness.

The cutout shape of the land L _C is, for example, as shown in FIGS. 3 (a) and 3 (b). In this embodiment in particular, since the formation of the gap by cutting the both sides in the radial direction of the land L _C as in FIG. 3 (a), as is clear from FIG. 2, notches (spool section on half of the spool S _SP ), The closing circuit C and the return circuit X are communicated with each other, and the outer peripheral surface of the spool S _SP (the lower half of the spool cross section) slides on the valve body 1B. Therefore, in the land L _C of the present embodiment, processing for connecting the closed circuit C and the return circuit X to each other is easy, and it is more effective to suppress the production cost.

The notch shape of the land L _C is not limited to this, and may be a spline groove as shown in FIG. 3B, for example.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a hydraulic circuit of an automatic transmission according to this embodiment.

FIG. 2 is an axial cross-sectional view showing a regulator valve in the same embodiment.

FIG. 3A is a radial cross-sectional view showing a cutout shape of an outer peripheral surface of a land. FIG. 6B is a radial cross-sectional view showing another cutout shape on the outer peripheral surface of the land.

FIG. 4 is an axial sectional view showing a conventional hydraulic control valve.

FIG. 5A is an axial sectional view showing a conventional hydraulic control valve. (B) is a sectional view showing a communication hole provided in the land surface.

[Explanation of symbols]

1 Regulator Valve 1 _SP Spool 1 _PL Plug 1 _SL Sleeve 2a Source Pressure Circuit 2b Feedback Pressure Circuit 3a Output Circuit 3b Drain Circuit 4 Signal Pressure Circuit C Closed Circuit X Return Circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-149461 (JP, A) JP-A-4-194403 (JP, A) JP-A-2-304244 (JP, A) Actual Kaihei 1- 98978 (JP, U) Actually open 63-82801 (JP, U) Actually open 63-157573 (JP, U) Special public Sho 50-1926 (JP, B1) Actual public 59-12647 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 3/00-3/36 F16K 31/12-31/165 F16H 61/00-61/64 F15B 11/00

Claims (2)

(57) [Claims] 1. From a source pressure circuit inserted in the valve body
It is interposed in a state with the original pressure pressure temper spool positioned in the valve within the body of
It connects the sleeve, and this sleeve the spool, the spool
A spring that applies a pressing force and a spring that is inserted in the sleeve so as to include the spring.
The signal pressure from the signal pressure circuit is applied to the spool by the spring.
Of the lands of the spool and the plug that act in the same direction as the pressing force, the spring acts
A land that, the remaining oil in the closed circuit formed by the land
Use the land so that it will escape from the return circuit to the oil reservoir.
A notch formed along the spool axial direction on the outer peripheral surface of the
Quito, hydraulic control valve, characterized in that it comprises a. 2. The hydraulic control valve according to claim 1, wherein the notches are formed on both sides in the radial direction of the land.