KR20070077729A - A bleed type variable force solenoid valve - Google Patents

Abstract

A bleed type variable force solenoid valve is provided to prevent an erroneous operation of the valve by providing an internal pressure forming unit on one side of a discharge port. A bleed type variable force solenoid valve includes a drive section(1) and a valve section(3). In the drive section, a coil(13) is wound on a bobbin(15) in the interior of a housing(11). In the interior of the bobbin, an armature(17) and an armature spindle(19) operated by the electromagnetic force of the coil is axially provided so that the resilient force of an adjusting spring(23) mounted by an adjusting screw(21) can be applied to the armature and the armature spindle. An orifice is formed on one side of a discharge port of a flange as an internal pressure forming unit for forming an internal pressure in the interior of the discharge port so that the internal pressure is applied to the rear surface of a piston ring.

Description

Bleed Type Variable Force Solenoid Valve {A BLEED TYPE VARIABLE FORCE SOLENOID VALVE}

1 is a cross-sectional configuration of a bleed-type variable force solenoid valve according to the prior art.

FIG. 2 is an enlarged cross-sectional view of the main part of FIG. 1. FIG.

3 is a control pressure characteristic graph of a bleed-type variable force solenoid valve for explaining a problem of the prior art.

Figure 4 is a cross-sectional configuration of the bleed-type variable force solenoid valve according to an embodiment of the present invention.

5 is an enlarged cross-sectional view illustrating main parts of a bleed-type variable force solenoid valve according to an exemplary embodiment of the present invention.

The present invention relates to a bleed type variable force solenoid valve, and more particularly, to a bleed type variable force solenoid valve which is applied to a valve body of a hydraulic control system such as an automatic transmission or a continuously variable transmission of a vehicle to variably control a flow path and its hydraulic pressure. variable force solenoid valve).

In general, the main types of solenoid valves used in automatic transmission or continuously variable transmission include on / off type, pulse width modulation (PWM) type and variable force solenoid valve (VFS).

Normally, solenoid valves of on / off type and PWM type are controlled by on / off signals from the shift control unit, while the variable force solenoid valve outputs a duty control signal for driving the solenoid valve in the shift control unit. The driving unit also drives the solenoid valve by the amount of current proportional to the output duty, and generally refers to a three-way spool type proportional control solenoid valve, but recently, as shown in FIG. 1, a closed end (CE) By applying technology, the bleed type variable force solenoid valve is actively being developed as a new solenoid valve by solving the flow consumption and residual pressure problems of the existing bleed type valve.

The configuration of the bleed-type variable force solenoid valve, as shown in Figure 1, is basically divided into a drive unit 1 and a valve unit 3, the drive unit 1 is a coil ( 13 is provided in a state of being wound around the bobbin 15, and inside the bobbin 15, an armature 17 and an armature spindle 19 operated by the electromagnetic force of the coil 13 are attached to the adjusting screw 21. It is provided in the axial direction so as to receive the elastic force of the adjustment spring 23 mounted by.

In the rear of the driving unit 1, a contact guide 25 having a contact fork 27 is provided.

The valve part 3 has a flange 31 having a supply port Ps through which a pump pressure is supplied, and a control port Pc and a discharge port Pe for supplying a control pressure to a flow path of a valve body (not shown). ) Is configured in front of the housing 11 of the drive unit 1 via the magnetic core 33.

The supply port Ps, the control port Pc, and the discharge port Pe are connected to each other therein along the center line SL of the flange 31 and at the same time on the center line SL of the flange 31. A valve needle 37, one end of which is supported by the amateur spindle 19 and guided in the axial direction by a needle bearing 35 configured in the magnetic core 33, is installed.

In addition, inside the supply port Ps on the center line SL of the flange 31, as shown in FIG. 2, a check ball 39 is provided in contact control with the other end of the valve needle 37. The valve seat 41 is configured to penetrate the valve needle 37 on an inner side surface of the flange 31 corresponding to the discharge port Pe by the valve needle 37. The piston seat corresponds to the valve seat 41. A ring 43 is fitted to the valve needle 37.

Therefore, in the bleed-type variable force solenoid valve of the above-described configuration, as shown in FIG. 2, the hydraulic pressure in the line P supplied from the pump is controlled according to a control signal from a shift control unit (not shown). Proportional adjustment of the piston ring 43 relative to the check ball 39 and the valve seat 41 maintains pressure balance in proportion to the electromagnetic force and the spring force acting on the spindle 19.

However, in the conventional bleed-type variable force solenoid valve as described above, the pressure balancing operation of the piston ring 43 with respect to the valve seat 41 and the piston ring 43 are integrally connected to the check ball 39. It is a factor that is not considered by the pressure balancing operation of the valve needle 37 which controls the valve needle 37 in a closed state, and the fluid force in the high temperature region is a change in flow force due to the hydraulic pressure in the valve portion 3. Together with the electromagnetic force and the spring force of the opposite side drive unit 1, the balance of the force is broken, which causes the valve to malfunction.

The above-described fluid force acts at right angles to the acting surface and the force on the fluid flow varies greatly depending on the angle of the fluid flow rate. That is, compared with the static fluid force, such a fluid force is a large variable in the solenoid pressure balance by increasing the flow rate as the resistance decreases as the temperature increases.

In FIG. 3, the balance of the force between the electromagnetic force and the spring force of the driving unit 1 with respect to the hydraulic pressure in the valve unit 3 is broken by the influence of the change in the fluid force in the high temperature region, so that the check ball 39 and the valve seat ( 41), the fine gap adjustment operation of the piston ring 43 is not made to form an open section in which the control pressure is detected in a section S reduced by about 0.5 to 2.0 kgf / cm 2 relative to the normal pressure. It is causing a problem.

Therefore, the cause of the problem is due to the fluid force in the high temperature region of the fluid, the present invention is to cancel the pressure by forming a pressure corresponding to the fluid force to the piston ring directly affected by the fluid force, It is borne in mind that the fine gap adjustment operation of the piston ring with respect to the valve seat can be normally performed, and an object of the present invention is to provide a piston ring for maintaining a balance of force between electromagnetic force and spring force of a drive unit against hydraulic pressure of a valve unit. It is to provide a bleed-type variable force solenoid valve to prevent the valve malfunction in the high temperature region by configuring the pressure-resistant forming means on one side of the discharge port on the opposite side of the fluid force in the high temperature region.

The bleed-type variable force solenoid valve according to the characteristics of the present invention for solving the above problems is a drive unit provided in the housing in the axial direction so that the armature and the amateur spindle operating by the electromagnetic force of the coil is provided with an elastic force of the adjustment spring; A flange forming a supply port Ps, a control port Pc, and a discharge port Pe, which are connected to each other, is formed in front of the driving unit, and a valve needle having one end supported by the amateur spindle inside the flange; A check ball configured in the control port Pc to be in contact with and controlled to the other end of the valve needle, a valve seat configured to pass through the valve needle on an inner surface corresponding to the discharge port Pe, and the valve seat In the bleed-type variable force solenoid valve comprising a valve portion configured to be fitted with the piston ring corresponding to the valve needle,

On one side of the discharge port of the flange is equipped with a pressure resistance forming means for forming an internal pressure inside the discharge port so that the internal pressure acts on the back surface of the piston ring, and in the amateur spindle to form a pressure balancing means for pressure balance of the internal pressure Characterized in that made.

The pressure resistant means is characterized in that it consists of an orifice mounted to the outlet port outlet end.

The pressure balancing means is characterized in that the through-hole formed in the axial direction and the axial perpendicular direction inside the amateur spindle.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can practice the present invention.

Figure 4 is a cross-sectional configuration of the bleed-type variable force solenoid valve according to an embodiment of the present invention, Figure 5 is an enlarged cross-sectional view of the main portion of the bleed-type variable force solenoid valve according to an embodiment of the present invention.

In the description of the configuration of the present invention, however, the same components as those in the prior art will be described with the same reference numerals.

As shown in FIG. 4, the bleed-type variable force solenoid valve according to the exemplary embodiment of the present invention is basically divided into a driving unit 1 and a valve unit 3, and the driving unit 1 of the housing 11 is formed. A coil 13 is provided inside the bobbin 15 in a state of being wound therein, and an inside of the bobbin 15 includes an armature 17 and an armature spindle 19 operated by an electromagnetic force of the coil 13. It is provided in the axial direction to receive the elastic force of the adjustment spring 23 mounted by (21).

In the rear of the driving unit 1, a contact guide 25 having a contact fork 27 is provided.

The valve part 3 has a flange 31 having a supply port Ps through which a pump pressure is supplied, and a control port Pc and a discharge port Pe for supplying a control pressure to a flow path of a valve body (not shown). ) Is configured in front of the housing 11 of the drive unit 1 via the magnetic core 33.

The supply port Ps, the control port Pc, and the discharge port Pe are connected to each other therein along the center line SL of the flange 31 and at the same time on the center line SL of the flange 31. A valve needle 37, one end of which is supported by the amateur spindle 19 and guided in the axial direction by a needle bearing 35 configured in the magnetic core 33, is installed.

In addition, inside the supply port Ps on the center line SL of the flange 31, as shown in FIG. 5, a check ball 39 is provided in contact control with the other end of the valve needle 37. The valve seat 41 is configured to penetrate the valve needle 37 on an inner side surface of the flange 31 corresponding to the discharge port Pe by the valve needle 37. The piston seat corresponds to the valve seat 41. A ring 43 is fitted to the valve needle 37.

Here, according to a specific embodiment of the present invention, the internal pressure is formed to form the internal pressure in the discharge port (Pe) so that the internal pressure acts on the rear surface of the piston ring 43 on one side of the discharge port (Pe) of the flange (31) By means of mounting the orifice 50 by means.

That is, the orifice 50 is mounted at the outlet end of the discharge port Pe, and the inner diameter of the orifice hole 51 is a main factor in the formation of the internal pressure by the residual pressure generated inside the discharge port Pe, and its size The determination of will be determined by the fluid force generated in the high temperature region, which can be determined based on the experimental results.

In addition, the amateur spindle 19 is configured to form a through hole 60 in the axial direction and the axially perpendicular direction in the interior of the amateur spindle 19 as a pressure balancing means for the pressure balance of the internal pressure.

Therefore, the operation of the bleed-type variable force solenoid valve of the above-described configuration is performed according to the control signal from the shift control unit (not shown) in the line hydraulic pressure P supplied from the pump as shown in FIG. The pressure balance is maintained by the fine gap adjustment operation of the piston ring 43 with respect to the check ball 39 and the valve seat 41 in proportion to the electromagnetic force and the spring force acting on the amateur spindle 19.

Of course, in the bleed-type variable force solenoid valve of the above-described configuration, during the pressure balancing operation of the piston ring 43 with respect to the valve seat 41, the fluid force in the high temperature region is equal to the hydraulic pressure in the valve portion 3. In the case of acting in response to the electromagnetic force and the spring force of the opposite side drive unit 1 together, the amount of fluid discharged through the discharge port Pe increases.

At this time, the residual pressure is generated in proportion to the amount of fluid increased in the discharge port Pe by the orifice 50, thereby increasing the internal pressure of the discharge port Pe, and the internal pressure of the piston ring 43 is increased. By counteracting the fluid force acting on one side to the other side of the piston ring 43 to cancel the fluid force does not break the equilibrium state of the force acting on the piston ring 43, resulting in malfunction of the valve It can be prevented.

Therefore, the bleed-type variable force solenoid valve of the present invention, despite the change in the fluid force in the high temperature region, the fine gap adjustment operation of the piston ring 43 with respect to the valve seat 41 is maintained in all sections, so that the control pressure is increased. You can keep it normally.

On the other hand, the through-hole 60 formed in the amateur spindle 19 is a fluid that seeps through the gap between the valve needle 37 and the needle bearing 35 at the internal pressure formed in the discharge port Pe. It acts only on one side of the amateur 17 and the amateur spindle 19 to supply and connect the fluid to the other side of the amateur 17 and the amateur spindle 19 to prevent the pressure imbalance due to the internal pressure. Will perform.

As described above, according to the bleed-type variable force solenoid valve according to the embodiment of the present invention, the fluid force in the high temperature region with respect to the piston ring for maintaining the balance of the force between the electromagnetic force and the spring force of the drive unit against the hydraulic pressure of the valve unit By forming a pressure resistant means on one side of the discharge port on the opposite side of the working side, the influence of the fluid force in the high temperature region is offset by the internal pressure of the discharge port on the opposite side, and thus the fine adjustment of the piston ring to the valve seat is normally performed. It has the effect of making it possible.

Claims (3)

A driving part provided in the housing in an axial direction such that the armature and the armature spindle operating by the electromagnetic force of the coil are provided with the elastic force of the adjustment spring; A flange forming a supply port Ps, a control port Pc, and a discharge port Pe, which are connected to each other, is formed in front of the driving unit, and a valve needle having one end supported by the amateur spindle inside the flange; A check ball configured in the supply port Ps to be in contact with and controlled to the other end of the valve needle, a valve seat formed at an inner side surface corresponding to the discharge port Pe and passing through the valve needle, and the valve seat In the bleed-type variable force solenoid valve comprising a valve portion configured to be fitted with the piston ring corresponding to the valve needle, On one side of the discharge port of the flange is equipped with a pressure-resistant forming means for forming the internal pressure inside the discharge port so that the internal pressure acts on the back surface of the piston ring, The bleed-type variable force solenoid valve, characterized in that formed in the amateur spindle by forming a pressure balancing means for the pressure balance of the internal pressure. The method of claim 1, The pressure resistance forming means is a bleed-type variable force solenoid valve, characterized in that consisting of an orifice mounted to the outlet end. The method of claim 1, The pressure balancing means is a bleed-type variable force solenoid valve, characterized in that consisting of a plurality of through-holes formed in the axial direction and the axial perpendicular direction inside the amateur spindle.

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