KR101160471B1 - Solenoid valve - Google Patents

Abstract

PURPOSE: A solenoid valve is provided to prevent rapid change of control pressure discharged through a control port by transferring some of fluid flowing from a supply chamber to a control chamber to a feedback chamber through a feedback passage formed in a spool. CONSTITUTION: A solenoid valve comprises a holder(110), a supply chamber(150), a control chamber(160), a discharge chamber(170), a feedback chamber(180), a supply port, a control port, a discharge port, a spool, a ring shaped groove, and a feedback passage. The supply chamber, the control chamber, the discharge chamber, and the feedback chamber are formed inside the holder and are separated to a longitudinal direction of the holder. The supply port, the control port, the discharge port are respectively connected to the supply chamber, the control chamber, and the discharge chamber and are formed in the outer circumference of the holder. The spool is movably installed inside the holder. The ring shaped groove is formed in the outer circumference of the spool and connects the control chamber to the supply chamber or the discharge chamber. The feedback passage is formed inside the spool, and connects or disconnects the control chamber and the feedback chamber when the spool moves.

Description

Solenoid Valve {SOLENOID VALVE}

The present invention relates to a solenoid valve, and more particularly to a solenoid valve used as a pressure regulating valve mechanism for controlling the hydraulic pressure supplied to the automatic transmission.

Automotive transmission is a device for converting and transmitting the rotational speed and torque of the engine to suit a variety of driving environment. For example, when the vehicle starts, it has a low rotational speed and a high rotational force, and when driving at a constant speed, it has a high rotational speed and a low rotational force. Such a transmission is classified into a manual transmission in which a shift process is manually performed by a driver and an automatic transmission automatically made by a predetermined pattern. The automatic transmission includes a torque converter, an operating mechanism, a planetary gear device, a hydraulic control mechanism, and an electronic control device. The hydraulic control mechanism is provided with a pressure regulating valve mechanism for controlling the hydraulic pressure supplied to the automatic transmission.

The solenoid valve described in the prior art document (Korean Patent Publication No. 10-1009266, 2011.01.12) is one of the above-described pressure regulating valve mechanism. Looking at the configuration, it includes a solenoid that operates according to whether the power is applied, a holder coupled to the solenoid, and a spool installed inside the holder. The supply chamber, the control chamber, the discharge chamber and the feedback chamber are formed inside the holder, and the supply port, the control port, the discharge port, and the feedback port connected to the supply chamber, the control chamber, the discharge chamber, and the feedback chamber are formed on the outer circumferential surface of the holder. do. In addition, a feedback flow path connecting the feedback chamber and the control chamber is formed on the outer circumferential surface of the holder.

By the way, the feedback flow path of the solenoid valve described above is formed as a groove open to the outside of the holder. That is, the feedback flow path is provided with a solenoid valve in the valve body so that the inner wall of the mounting hole into which the holder is inserted closes one open side of the feedback flow path. Therefore, if the holder is not in close contact with the mounting hole due to processing tolerances, the port cannot be completely sealed between each port, and as a result, the fluid introduced into the holder is abnormally moved between the chambers, so the hydraulic pressure supplied to the automatic transmission is secure. Can not be controlled.

The present invention is to solve the above problems of the prior art, it is possible to reliably control the hydraulic pressure supplied to the automatic transmission, improve the response of the valve, the linearity of the control pressure according to the current applied to the solenoid And a solenoid valve capable of securing a control section.

In addition, an object of the present invention is to provide a solenoid valve that can completely prevent the leakage of fluid and abnormal movement by completely blocking between the chambers, and minimize the pressure loss due to leakage and abnormal movement of the fluid.

The solenoid valve according to the present invention for achieving the above object includes a valve for intercepting the inflow and out of the fluid, and a solenoid for operating the valve. Moreover, the said valve consists of a holder of a pipe shape, and the spool provided so that a movement is possible inside the said holder.

A supply chamber, a control chamber, a discharge chamber, and a feedback chamber spaced apart in the longitudinal direction are formed inside the holder, and a supply port and a control port connected to the supply chamber, the control chamber, and the discharge chamber, respectively, on the outer circumferential surface of the holder. , Discharge port is formed.

An outer circumferential surface of the spool is formed with an annular groove connecting the control chamber to the supply chamber or the discharge chamber when the spool is moved, and connecting or blocking the control chamber and the feedback chamber when the spool is moved. A feedback flow path is formed.

In this case, a first feedback port for connecting the feedback channel and the control chamber is formed at the stop of the spool, and a second feedback port for connecting the feedback channel and the feedback chamber is formed at one end of the spool. Further, one end outer circumferential surface of the spool is formed in multiple stages, and one end inner circumferential surface of the holder is formed in multiple stages corresponding to one end of the spool. Particularly, one end of the spool is formed in multiple stages in which the diameter of the first feedback port side is larger than the diameter of the opposite side with respect to the second feedback port.

O-ring is formed between the supply port and the control port, the control port and the discharge port of the outer peripheral surface of the holder, sealing between the supply port and the control port, between the control port and the discharge port This is installed in the mounting groove.

According to the present invention configured as described above, since a part of the fluid flowing from the supply chamber to the control chamber is transferred to the feedback chamber through a feedback flow path formed in the spool, it is possible to prevent the control pressure discharged through the control port from fluctuating rapidly. have. That is, the control pressure can be increased or decreased with a gentle slope, and the change in the control pressure can have a constant linearity.

In addition, in the present invention, since a feedback passage connecting the control chamber and the feedback chamber provided in the holder is formed in the spool, it is possible to prevent the loss of pressure through the feedback passage, so that the hydraulic pressure supplied to the automatic transmission through the control port. Can be controlled reliably and the response of the valve can be improved.

In addition, according to the present invention, by forming the feedback flow path inside the spool, the holder can be processed into a cylinder, and the solenoid valve can be brought into close contact with the mounting hole of the valve body, thereby preventing leakage of the fluid. In particular, by providing the mounting groove and the O-ring on the outer circumferential surface of the holder can be completely blocked between the chambers to prevent abnormal movement of the fluid. Therefore, it is possible to minimize the pressure loss due to leakage and abnormal movement of the fluid.

1 is a cross-sectional view of a solenoid valve according to an embodiment of the present invention.
Figure 2 is an enlarged view of the valve of the solenoid valve according to an embodiment of the present invention.
3 is an enlarged view of a portion “A” of FIG. 2;
4 and 5 is an operating state of the solenoid valve according to an embodiment of the present invention.

With reference to the accompanying drawings will be described embodiments of the present invention; In the following description of embodiments according to the present invention, and in adding reference numerals to the components of each drawing, the same reference numerals are added to the same components as much as possible even though they are shown in different drawings.

As shown in Figure 1 and 2, the solenoid valve according to an embodiment of the present invention is composed of a valve 100 to control the flow of fluid, and a solenoid 200 to operate the valve 100.

The valve 100 is mounted on a valve body (not shown) having a plurality of flow paths, so that the valve 100 is supplied to a clutch (not shown) by applying a predetermined control pressure to a fluid supplied from an external hydraulic supply source. The valve 100, the holder 110, the spool 120 is installed to be movable inside the holder 110, the spring 130 and the pressure adjustment screw 140 provided on the upper portion of the spool 120 It includes.

The holder 110 is formed in a pipe shape to allow the spool 120 to move therein. The supply chamber 150, the control chamber 160, the discharge chamber 170, and the feedback chamber 180 are formed inside the holder 110, and each chamber 150 to 180 is disposed at an upper portion of the holder 110. Are sequentially placed. On the outer circumferential surface of the holder 110, a supply port 152 connected to the supply chamber 150, a control port 162 connected to the control chamber 160, and a discharge port 172 connected to the discharge chamber 170 are moved from the bottom to the top of the holder 110. Are formed sequentially.

The supply port 152 is a port into which the fluid supplied from an external hydraulic supply source is injected, and the control port 162 is a port through which the fluid controlled to a predetermined pressure is discharged to the clutch (not shown) side of the transmission. The discharge port 172 is a port through which fluid is discharged to remove the residual pressure inside the holder 110. In this case, the supply port 152 is formed around the supply chamber 150, the control port 162 is formed around the control chamber 160, and the discharge port 172 is formed around the discharge chamber 170. In particular, each port 152, 162, 172 is comprised of a plurality of radially disposed along the circumference of each chamber 150, 160, 170.

A first auxiliary chamber 190a is formed at an inner upper portion of the holder 110, that is, an upper portion of the feedback chamber 180, and a first auxiliary port 192a is provided at the pressure adjusting screw 140 coupled to the upper end of the holder 110. ) Is formed. In addition, a second auxiliary chamber 190b is formed at an inner lower portion (lower portion of the supply chamber 150) of the holder 110, and a second auxiliary port 192b is formed around the second auxiliary chamber 190b. . The auxiliary chambers 190a and 190b and the auxiliary ports 192a and 192b described above are means for discharging the foreign matter contained in the fluid and fluid contained in the outer circumferential surface of the spool 120 to the outside. As such, when the fluid is discharged through the auxiliary ports 192a and 192b, the residual pressure inside the holder 110 is removed, so that the spool 120 can move smoothly.

A plurality of mounting grooves 112a to 112c are formed on the outer circumferential surface of the holder 110 in the longitudinal direction of the holder 110, and O-rings 114a to 114c are installed on the mounting grooves 112a to 112c. The mounting grooves 112a to 112c and the O-rings 114a to 114c are provided with a first mounting groove 112a, a first O-ring 114a, and a supply port provided between the supply port 152 and the second auxiliary port 192b. 152 and the third mounting groove 112b provided between the control port 162 and the second O-ring 114b, the third mounting groove 112c and the third provided between the control port 162 and the discharge port 172. O-ring 114c. The first mounting groove 112a and the first O-ring 114a described above prevent the fluid from moving abnormally between the supply chamber 150 and the second auxiliary chamber 190b, and the second mounting groove 112b. The second O-ring 114b prevents fluid from moving abnormally between the supply chamber 150 and the control chamber 160. In addition, the third mounting groove 112c and the third O-ring 114c prevent the fluid from moving abnormally between the control chamber 160 and the discharge chamber 170.

The spool 120 has a multistage spool shape in which a plurality of annular grooves 122a to 122c are formed on an outer circumferential surface thereof. Inside the spool 120, the feedback channel 124 formed in the longitudinal direction of the spool 120, the first feedback port 126a, the feedback channel 124 connecting the feedback channel 124 and the control chamber 160 and A second feedback port 126b connecting the feedback chamber 180 is formed.

The annular grooves 122a to 122c are means for switching the flow of fluid or selectively opening and closing the supply port 152, the control port 162, and the discharge port 172. The annular grooves 122a to 122c may include a first annular groove 122a connecting the supply chamber 150 and the control chamber 160 when the spool 120 rises, and a control chamber when the spool 120 descends. The second annular groove 122b connecting the 160 and the discharge chamber 170 and the third annular groove 122c forming the feedback chamber 180 are included. The first annular groove 122a, the second annular groove 122b, and the third annular groove 122c are sequentially positioned from the bottom of the spool 120 to the top thereof.

Here, the upper end of the spool 120 corresponding to the feedback chamber 180 is formed in multiple stages with different diameters of the outer circumferential surface. That is, one end of the spool 120 is formed in multiple stages with the diameter d1 of the upper portion 128a smaller than the diameter d2 of the lower portion 128b around the second feedback port 126b.

A pressure regulating screw 140 is installed in the upper open area of the holder 110 to adjust the control pressure applied to the clutch side through the control port 162. In addition, a spring 130 is installed between the pressure adjusting screw 140 and the spool 120 to elastically support the spool 120 downward and to absorb the shock generated when the spool 120 moves.

According to the structure of the valve 100 described above, the upper end of the spool 120 located in the feedback chamber 180 is formed in multiple stages having different diameters so that the pressure receiving area of the feedback chamber 180 is different from each other. That is, the diameter d1 of the upper portion 128a of the upper end of the spool 120 is formed to be smaller than the diameter d2 of the lower portion 128b, so that when the fluid flows into the feedback chamber 180, the lower portion of the hydraulic portion is larger. A relatively large force is applied to (128b). Therefore, the spool 120 is suppressed from rising sharply so that the control pressure of the fluid flowing into the control chamber 160 and discharged through the control port 162 may increase or decrease with a gentle slope.

Looking at the control process of the above-described control pressure in more detail, when power is applied to the solenoid 200, the spool 120 is raised to connect the supply chamber 150 and the control chamber 160, the supply port 152 The fluid supplied through the inlet flows into the control chamber 160 via the supply chamber 150. At this time, the fluid introduced into the control chamber 160 from the supply chamber 150 is transferred to the feedback chamber 180 through the feedback ports 126a and 126b and the feedback flow path 124, so that the fluid It is possible to prevent the pressure of the control chamber 160 from rising rapidly. In addition, since the fluid transferred to the feedback chamber 180 applies a relatively large force to the lower portion 128b having a larger hydraulic pressure area than the upper portion 128a, the spool 120 may be prevented from rapidly rising. Therefore, since the control pressure discharged through the control port 162 increases or decreases with a gentle slope, the change in the control pressure has a constant linearity, and the control section of the pressure is extended to control the control pressure more precisely. Can be.

In the valve 100 according to the present exemplary embodiment, the feedback passage 124 and the feedback ports 126a and 126b connecting the feedback chamber 180 and the control chamber 160 are formed in the spool 120, and thus the feedback passage Loss of pressure by 124 can be prevented, so that hydraulic pressure supplied to the automatic transmission through the control port 162 can be reliably controlled, and response can be improved.

In addition, the chambers 150, 160, 170, and 190b are sealed to each other through O-rings 114a to 114c provided between the supply port 152, the control port 162, the discharge port 172, and the second auxiliary port 192b. It is possible to prevent the fluid from moving abnormally between the chambers (150, 160, 170, 190b). In particular, in this embodiment, since the feedback flow path 124 is formed inside the spool 120, the holder 110 may be manufactured in a complete cylinder, and when the O-rings 114a to 114c are installed on the outer circumferential surface of the holder 110. The holder 110 and the O-rings 114a to 114c and the O-rings 114a to 114c and the mounting holes (mounting holes formed in the valve body, not shown) are perfectly in contact with each other. Therefore, it is possible to reliably control the pressure of the fluid discharged to the automatic transmission after being supplied to the solenoid valve from the external hydraulic supply source by minimizing the pressure loss due to the leakage and abnormal movement of the fluid.

Meanwhile, a ring type filter 116 may be installed in each of the ports 152, 162, 172 disposed radially along the circumference of each chamber 150, 160, 170.

The solenoid 200 is a device that moves the plunger 250 by generating a magnetic field when power is applied, and operates the valve 100 through a rod 270 coupled to the plunger 250. Looking at the configuration with reference to Figure 1, the case 210, the bobbin 220 installed inside the case 210, the coil 230 wound around the outer peripheral surface of the bobbin 220, the lower end of the bobbin 220 Yoke 240 inserted through the, plunger 250 installed inside the yoke 240, the core 260 coupled to the top of the yoke 240, coupled to penetrate the top of the core 260 It includes a rod 270 and a connector 280 coupled to one side of the lower end of the yoke 240.

In the present embodiment, the solenoid 200 is exemplified in the above-described structure, but is not necessarily limited thereto, and the solenoid 200 may be used as long as the valve 100 may be operated depending on whether power is applied.

Looking at the operation of the solenoid valve according to an embodiment of the present invention with reference to Figure 4 and 5 as follows.

4 is a state in which power is applied to the solenoid 200. That is, power is applied to the solenoid 200 to generate a magnetic field in the coil 230, and the plunger 250 moves by the generated magnetic field to raise the rod 270 and the spool 120. When the spool 120 rises through the above-described process, the supply chamber 150 and the control chamber 160 are connected to each other, and the connection between the control chamber 160 and the discharge chamber 170 is blocked.

In this state, when the fluid is supplied through the supply port 152, it is controlled to a predetermined pressure in the process of passing through the supply chamber 150 and the control chamber 160, and then the clutch of the automatic transmission through the control port 162 (not shown). ) Is discharged to the side.

At this time, the fluid introduced into the control chamber 160 from the supply chamber 150 is transferred to the feedback chamber 180 through the feedback ports 126a and 126b and the feedback flow path 124, so that the fluid It is possible to prevent the pressure of the control chamber 160 from rising rapidly. In addition, since the fluid transferred to the feedback chamber 180 applies a relatively large force to the lower portion 128b having a larger hydraulic pressure area than the upper portion 128a, the spool 120 may be prevented from rapidly rising. Therefore, since the control pressure discharged through the control port 162 increases or decreases with a gentle slope, the change in the control pressure has a constant linearity, and the control period of the pressure is extended to control the control pressure more precisely. Can be.

On the other hand, when the power applied to the solenoid 200 is cut off, the spool 120, the plunger 250 and the rod 270 are lowered by the spring 130 installed on the holder 110 (see FIG. 5). As such, when the spool 120 descends, the supply chamber 150 and the control chamber 160, which are connected, are blocked, and the control chamber 160 and the discharge chamber 170 are connected to each other.

In this state, even though fluid is supplied through the supply port 152, the fluid is not transferred to the control port 162, and the fluid (fluid controlled at a predetermined pressure) and the feedback chamber 180 which have been discharged to the clutch side through the control port 162 are supplied. The fluid that flowed in is discharged to an external fluid storage tank (not shown) through the discharge chamber 172 through the control chamber 160 and the discharge chamber 170.

While the present invention has been described through the preferred embodiments, the above-described embodiments are merely illustrative of the technical idea of the present invention, and various changes may be made without departing from the technical idea of the present invention. Those of ordinary skill will understand. Therefore, the protection scope of the present invention should be interpreted not by the specific embodiments, but by the matters described in the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: valve 110: holder
112a to 112c: mounting groove 114a to 114c: o-ring
116: filter 120: spool
122a: first annular groove 122b: second annular groove
122c: third annular groove 124: feedback channel
126a: first feedback port 126b: second feedback port
130: spring 140: pressure adjustment screw
150: supply chamber 152: supply port
160: control chamber 162: control port
170: discharge chamber 172: discharge port
180: feedback chamber 190a: first auxiliary chamber
192b: first auxiliary port 190b: second auxiliary chamber
192b: second auxiliary port 200: solenoid
210: case 220: bobbin
230: coil 240: yoke
250: plunger 260: core
270: load 280: connector

Claims (7)

A solenoid valve comprising a valve for controlling the inflow and out of fluid, and a solenoid for operating the valve.
The valve,
A holder in the shape of a pipe;
A supply chamber formed inside the holder and spaced apart in the longitudinal direction of the holder, a control chamber, a discharge chamber, and a feedback chamber;
A supply port, a control port, and a discharge port connected to the supply chamber, the control chamber, and the discharge chamber, respectively, and formed on an outer circumferential surface of the holder;
A spool movably installed in the holder;
An annular groove formed on an outer circumferential surface of the spool and connecting the control chamber to the supply chamber or the discharge chamber when the spool moves; And
The solenoid valve is formed in the spool, the solenoid valve including a feedback flow path for connecting or blocking the control chamber and the feedback chamber when the spool is moved.
The method according to claim 1,
A first feedback port for connecting the feedback channel and the control chamber is formed at the stop of the spool, and a second feedback port for connecting the feedback channel and the feedback chamber is formed at one end of the spool.
One end outer circumferential surface of the spool is formed in multiple stages, and one end inner circumferential surface of the holder is formed in multiple stages corresponding to one end of the spool.
The method according to claim 2,
The one end of the spool, the solenoid valve, characterized in that formed in multiple stages with the diameter of the first feedback port side of the second feedback port larger than the opposite side diameter.
The method according to claim 3,
The annular groove includes a first annular groove connecting the control chamber to the supply chamber when the spool moves, and a second annular groove connecting the control chamber to the discharge chamber when the spool moves.
The solenoid valve, characterized in that the first feedback port is located between the first annular groove and the second annular groove.
The method of claim 4,
Mounting grooves are formed between the supply port and the control port of the outer peripheral surface of the holder, between the control port and the discharge port,
The solenoid valve, characterized in that the O-ring sealing between the supply port and the control port, between the control port and the discharge port is installed in the mounting groove.
The method according to claim 5,
A solenoid valve, characterized in that the ring-shaped filter is provided on the outer peripheral surface of the holder, the supply port is formed and the outer peripheral surface of the holder, the control port is formed.
The method according to any one of claims 1 to 6,
A control screw is coupled to one end of the holder, the elastic means is interposed between the control screw and the spool, the solenoid valve, characterized in that the solenoid is installed on the other end of the holder.

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