JPH10184937A - Hydraulic control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the relief of remaining oil of a closed circuit formed between a spool and a valve body without deteriorating assembling workability or increasing cost. SOLUTION: In a regulator valve 1, a plug 1PL is inserted into a sleeve 1SL, and the sleeve 1SL is inserted in a valve body 1B in a state where it is connected to a spool 1SP through a spring S. When a closed circuit C is formed between the spool 1SP and the valve body 1B, a cutout extending along the spool axial direction is formed on the outer peripheral surface in a load Lc of the spool 1SP so that the closed circuit C may communicate with a return circuit X in the position separated from the circuit C.

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 into a valve body.

[0002]

BACKGROUND OF THE INVENTION Hydraulic control valve, for example, there is a hydraulic pressure control valve 10 shown in FIG. 4, it presses the one end of the spool 10 _SP having a plurality of lands by a spring S valve body 10B
It is inserted in. Hydraulic pressure control valve 10 inputs the source pressure P _in to the original pressure circuit 2a and the feedback pressure circuit 2b,
Based on the pressing force of the signal pressure P _S and the spring S from the signal pressure circuit 4, the source pressure P _in from said source pressure circuit 2a, the pressing force spool 10 _SP is by the signal pressure P _S and the spring S performs pressure regulation by moving the opposite direction, the oil was drained from the output circuit 3a or output circuit 3a and a drain circuit 3b,, in which pressure the source pressure P _in tone.

[0003]

However, since such a hydraulic control valve has a shape in which the spool _10SP has a plurality of lands, for example, as shown in FIG.
Since a closed circuit C may be formed between 0 _SP and the valve body 10B, the operation of the control valve is prevented by the residual oil in the closed circuit C.

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

However, it is necessary to design the above-mentioned return circuit in consideration of the viscous resistance of the oil and the like from the purpose thereof. In particular, when the diameter of the return circuit is reduced, a certain restriction is imposed ( Generally, the diameter of the return circuit must be 3.5 mm or more). For this reason, for example, in the case of the closed circuit C existing at a position as shown in FIG.

As a countermeasure, first, the outer diameter of the land is reduced as a whole so that the closed circuit communicates 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 work.

[0007] As shown in FIG. 5 (a), conventionally, some releasing the circuit C is closed is provided an axial through hole H on the land L _c of the spool 10 _SP, but 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 Would.

The present invention has been made in view of the above-described circumstances, and has been made in consideration of the above-described circumstances. It is an object of the present invention to provide a hydraulic control valve capable of releasing pressure.

[0009]

According to the present invention, there is provided:
The hydraulic control valve according to the above, wherein in a hydraulic control valve in which a spool having a plurality of lands is inserted in a valve body, when a closing circuit is formed between the spool and the valve body, the closing circuit A notch is formed on the outer peripheral surface of the land of the spool along a spool axial direction so as to communicate with a return circuit located at a position farther than the closed circuit.

According to a second aspect of the present invention, there is provided a hydraulic control valve according to the first aspect, wherein the notch is formed on both radial sides of the land.

[0011]

According to the first aspect of the present invention, when the closed circuit is formed between the spool and the valve body, the closed circuit is located farther from the closed circuit. A notch along the spool axis direction is formed on the outer peripheral surface of the spool land so as to communicate with a certain return circuit. Therefore, even if the above-described closed circuit is formed in a place where the return circuit is difficult to be provided, assembly workability is improved. The oil remaining in the closed circuit can be released to the outside without deteriorating the oil pressure or increasing the production cost, and the smooth operation of the hydraulic control valve can be ensured.

According to a second aspect of the present invention, in the hydraulic control valve according to the first aspect, the notch is formed on both radial sides of the land, so that the closing circuit and the return circuit communicate with each other. Is easier to process, which is more effective in reducing production costs.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
This will be described in detail with reference to the attached drawings. Figure 1 shows the automatic conversion
FIG. 2 is a circuit diagram showing a part of a hydraulic circuit of a speed changer, according to the present invention.
Regulator valve 1 is a clutch regulator valve 2
Output pressure P from 0_inTo the main pressure circuit 2a and the feedback
And the signal pressure P from the signal pressure circuit 4
_sAnd the pressing force of the spring S_SPThe axis
The pressure is adjusted by moving in the direction
a or oil from the output circuit 3a and the drain circuit 3b
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 in a state of being connected to the spool 1 _SP, it is interposed within the valve body 1B. At this time, the external pressure _Po acts on the side surface of the sleeve _1SL .

[0015] regulator valve 1 for inputting original pressure P _in from the original pressure circuit 2a is the working pressure P _f from the feedback pressure circuit 2b with exerting the pressing force opposite to the direction of the spring S, the signal pressure circuit 4 pressure signal pressure P _S of the spring S from the same direction in order to act on the plug 1 _PL. That is, the spool 1 _SP is axially moved to a position where the pressing force of the spring S, the operating pressure P _f from the feedback pressure circuit 2 b, and the signal pressure P _S from the signal pressure circuit 4 can be balanced. or oil was drained from the output circuit 3a and a drain circuit 3b, pressed the source pressure P _in tone.

By the way in this regulator valve, for example, by the land L _c which 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, a 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 connected so that the closed circuit C communicates with the return circuit X located at a position farther from the circuit _C. A notch is formed on the outer peripheral surface along the axial direction of the spool.

[0018] Thus, the circuit C is closed, and the return circuit X which is located remotely from the circuit C, communicated by notch gap formed on the outer peripheral surface of the land L _c, closed circuit C
The residual oil inside can be released from the return circuit X.
Therefore, even if the closed circuit C is located 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 assembly workability or increasing the production cost. 1 does not deteriorate the responsiveness.

The cutout shape of the land L _C includes, for example, those 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 ) at communicated between circuitry X and return circuit C is closed, the outer peripheral surface of the spool S _SP (spool sectional lower half) slides the valve body 1B. Therefore, in the land L _C of the present embodiment, processing for communicating the closing circuit C and the return circuit X is easy, which is further effective in reducing the production cost.

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

[Brief description of the drawings]

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

FIG. 2 is an axial sectional view showing a regulator valve according to the embodiment.

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

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 on a land surface.

[Explanation of symbols]

Reference Signs List 1 Regulator valve 1 _SP spool 1 _PL plug 1 _SL sleeve 2a Main pressure circuit 2b Feedback pressure circuit 3a Output circuit 3b Drain circuit 4 Signal pressure circuit C Closed circuit X Return circuit

Claims (2)

[Claims] 1. A hydraulic control valve in which a spool having a plurality of lands is inserted into a valve body, wherein a closing circuit is formed between the spool and the valve body when the closing circuit is formed. A hydraulic control valve, characterized in that a cutout is formed on the outer peripheral surface of the land of the spool along the spool axial direction so as to communicate with a return circuit located at a position farther away. 2. The hydraulic control valve according to claim 1, wherein the notch is formed on both sides in the radial direction of the land.