Pressure control valve (versions)

FIELD: engines and pumps.

SUBSTANCE: valve has a body with the feed pressure supply channel, an outlet channel, a controlled pressure outlet channel and an inner boring accommodating a control valve with an inner channel with throttle communicating the inlet channel with the left-hand space formed by the body boring and the left-hand end face of the said control valve and communicating with the outlet channel via the control valve, and a channel communicating the outlet channel with the right-hand space formed by the body boring and the control valve right-hand end face and containing a return spring acting on the slide valve. The slide valve incorporates an additional spring-loaded channel communicating the right-hand space with the outlet channel, while the channel communicating the outlet channel with the right-hand space accommodates an additional throttle. In compliance with the other valve version, the right-hand space can communicate via the spring-loaded valve with the outlet channel. Here the additional spring-loaded valve is arranged inside the slide valve or in the main valve body.

EFFECT: smooth engagement of gearbox friction gear wheels.

4 cl, 5 dwg

 

The present invention relates to the field of engineering, namely, controls the pressure in the hydraulic device.

Known pressure regulators, such as pressure reducing valves, constant pressure (Basta T.M. Hydraulic drive and gidropnevmoavtomatike, M., engineering, 1972, s.) - [1]. This valve includes a housing with a channel for supplying pressure, the drain channel and the output channel and an internal bore in which is placed a valve that changes the flow area between the channel inlet pressure and outlet channel. On the movable part of the valve acts on the one hand, the spring tending to increase the flow area, and on the other hand, the pressure in the output channel, which reduces the flow cross-section. In the output channel is maintained stable pressure value which is set by the force of the spring tension. The main disadvantage of this control is the inability to efficiently manage the size of the output pressure.

The closest device and purpose is a valve with solenoid control, such as valve type XRP 044 company Comatrol (1) (www.comatrol.com see Appendix 1)adopted for the prototype [2]. This valve has a housing 1 with a channel for supplying pressure supply 2, the drain channel 3, the output channel of the regulated pressure of 4 and an internal bore in which is placed evils is tnik 5, connecting, depending on its position, the output channel of the regulated pressure of 4 or channel inlet pressure supply 2 or the drain channel 3. In the body of the valve is made channels. Channel 10 is permanently connected through a throttle 11 channel inlet pressure 2 on the left cavity formed by the bore in the body and the left end of the spool. Channel 9 connects the output channel 4 on the right cavity formed by the bore in the housing, and the right end of the spool, in which there is a return spring 6. The left cavity communicates with the drain channel via the control valve 7, the force on which to set the current of the electromagnet 8. The valve position is determined by the balance of forces act on it: on the left hand side - pressure preset force of the electromagnet, with the right-hand side - pressure is generated in the output channel and the force of the return spring.

The disadvantages of the known constructions can be attributed to the difficulty of precise control of small quantities of pressure as a continuous throttle covers the entire pressure range from zero to almost full pressure supply, and the inability to realize the full output pressure of the power due to the influence of a return spring.

The technical result, which directed the claimed invention is to improve the accuracy of regulation in which blasti small pressures (1/10-1/5 of the pressure supply) and then a rapid increase of the output pressure to full pressure supply.

The technical result is achieved by the fact that in the first embodiment in the valve to control pressure, comprising a housing with a channel for supplying pressure supply, a drain channel, the output channel of the regulated pressure and the internal bore in which is placed a valve having inside the channel with the throttle connecting channel inlet pressure supply from the left cavity formed by the bore in the body and the left end of the spool and communicating with a channel drain via the control valve, and a channel connecting the output channel of the regulated pressure from the right cavity formed by the bore in the housing, and the right end of the valve and containing a return spring acting on the spool, what is new is that valve made canal that connects the right cavity with a channel drain, which has a spring-loaded valve, and the canal connecting the output channel of the regulated pressure from the right cavity, an additional throttle.

The second option in the valve to control pressure, comprising a housing with a channel for supplying pressure supply, a drain channel, the output channel of the regulated pressure and the internal bore in which is placed a valve having inside the channel with the throttle connecting channel inlet pressure supply from the left cavity formed by the bore in the body and the left end of the gold the ICA and communicating with a channel drain via the control valve, and the channel connecting the output channel of the regulated pressure from the right cavity formed by the bore in the housing, and the right end of the valve and containing a return spring acting on the spool, it is new that the right cavity made with the possibility of connection of additional spring-loaded valve with the output channel of the regulated pressure or drain channel.

Additional spring-loaded valve can be installed inside of the valve main valve or additional bore of housing of the main valve.

The invention is illustrated by drawings, where:

Figure 2 - valve for pressure control (option 1).

Figure 3 - valve for pressure control with optional spring-assisted switching valve installed inside the spool of the main valve (option 2).

4 is a valve for pressure control with optional spring-assisted switching valve installed at an additional bore of housing of the main valve (option 2).

Figure 5 - dependence of the output pressure from the control signal.

Valve for option 1 (Figure 2) includes a housing 1 with a channel for supplying pressure supply 2 channel drain 3 and the output channel of the regulated pressure of 4, with the bore containing the slide valve 5 and a return spring 6, the control valve 7 solenoid 8. The spool is 5 there is a channel 9, connecting the output channel of the regulated pressure of 4 from the right cavity formed by the bore in the housing 1 and the right end of the spool 5, and the channel 10 with the throttle 11 connecting the channel inlet pressure supply 2 on the left cavity formed by the bore in the housing 1 and the left end of the spool 5 and communicating with a channel drain through the control valve 7. The spool is made additional channel that connects the right atrium with the drain channel 3 and in which an additional valve 12, spring-loaded by a spring 13, and channel 9 is an additional orifice 14.

Valve for option 2 for pressure control includes a housing 1 with a channel for supplying pressure supply 2, the drain channel 3, the output channel of the regulated pressure of 4 and an internal bore in which is placed a valve 5, which is inside the channel with the throttle 11 connecting the channel inlet pressure supply 2 on the left cavity formed by the bore in the housing 1 and the left end of the spool 5 and communicating with a channel drain 3 through the control valve 7, and a channel connecting the output channel of the regulated pressure of 4 from the right cavity formed by the bore in the housing 1 and the right end of the spool 5 and containing return the spring 6 acting on the spool 5. In the right valve cavity made with the possibility of connection of additional spring-loaded by a spring 16 valve 5 with the output channel of the regulated pressure of 4 or channel drain 3.

Additional spring-loaded valve 15 may be mounted inside the spool 5 of the main valve (3) or more bore of the housing 1 of the main valve (Figure 4).

The valve (Figure 2) works as follows. In the absence of current in the winding of the electromagnet 8, the control valve 7 free reports left cavity formed by the bore in the housing 1 and the left end of the spool 5, the channel drain 3 and the pressure in it close to the pressure in the channel drain, because the pressure drop across the orifice 11 is almost equal to the supply pressure. Under the action of return spring 6, the valve 5 is moved to the leftmost position, connecting the output channel of the regulated pressure of 4 with channel drain 3. The channel inlet pressure supply 2 is blocked by the spool 5 from the output channel of the regulated pressure of 4. The pressure in the output channel of the regulated pressure of 4 (hydraulic clutch) close to zero. When the supply current in the coil of the electromagnet 8, the control valve 7 applies a force determined by the amount of current that decreases the flow of liquid through the orifice 11 and in the left cavity is set to a pressure proportional created by the electromagnet 8 effort. When the force created by the pressure in the left cavity, exceeds the force of the return spring 6, the valve 5 is shifted to the right, opening the path of the fluid from the channel inlet pressure supply 2 o the ne channel adjustable pressure 4. The pressure in the output channel of the regulated pressure of 4 through the orifice 14 and the channel 9 in the slide valve 5 is transferred in the right cavity. The spool 5 will occupy such a position in which the forces acting on it left and right, will be counterbalanced. The pressure in the output channel of the regulated pressure of 4 when it is determined by the amount of current of the electromagnet 8. Upon reaching a certain pressure in the right cavity, on which the pre-tensioning spring 13 is configured additional valve 12, it says right cavity with a channel drain 3 and the pressure no longer increases. With further increase of the current of the electromagnet 8 and correspondingly increasing the pressure in the left cavity of the balance of forces acting on the spool 5 will be broken and the valve 5 will be moved to the extreme right position, providing a reliable connection of the output channel of the regulated pressure of 4 channel inlet pressure supply 2 and the full supply pressure supply to the hydraulic cylinder of the clutch.

The dependence of the pressure in the output channel of the regulated pressure of 4 from the residual current of the electromagnet 8 is shown in Figure 5. The characteristic has areas deadband OA, plot a smooth pressure regulation AB, the area of rapid pressure rise sun and the plot of saturation of the CD on which the pressure in the output channel of the regulated pressure of 4 does not depend on in the mask of a current of the electromagnet 8 and is equal to the supply pressure. The length of the section AB is determined by the setting of the spring 13 additional valve 12.

The application of the proposed device allows more accurate control at low pressures, the most important for controlling multiple devices, in particular the friction of inclusion programs in planetary boxes change-speed heavy vehicles. This provides a smooth shock-free switching gear that reduces the dynamic loads on the driveline, increases the durability of the transmission and improves the comfort of use of the machine.

In some cases, the presence of the inductor 14 in the canal, which connects the right atrium to the output channel of the regulated pressure of 4, is undesirable because it limits the speed of movement of the spool 5. To overcome this lack of available valve design in which the inductor 14 no. To provide the required type of static characteristics used additional switching valve 15 and a spring 16.

Depending on design requirements and working conditions extra spring-loaded switch valve 15 within the valve 5 (Fig 3) or in the case 1 of the main valve (Figure 4).

If the pressure in the left cavity defined by the force of the electromagnet 8, does not reach t (Figure 5), the switch is uchumi valve 15 (Fig 3 and 4) is retained by the spring 16 in the initial position, telling the right cavity with the output channel of the regulated pressure of 4 that provides for the formation of the output channel of the regulated pressure of 4 required pressure. When the pressure in the left cavity exceeds the value in t (Figure 5), the switching valve 15 (Fig 3 and 4), overcoming the force of spring 16 will move in the right position. The right cavity is separated from the output channel of the regulated pressure of 4 and is connected with the drain channel 3. The pressure will decrease and the pressure in the left cavity of the valve 5 (Fig 3 and 4) will be moved to the extreme right position, telling output channel adjustable pressure 4 channel inlet pressure supply 2. The dependence of the pressure in the output channel of the regulated pressure of 4 from the control current of the electromagnet 8 has the form shown in Figure 5.

Thus, the introduction in the design of the additional valve elements when the preset pressure connection right cavity with a channel drain, allow to implement the necessary dependence of the output pressure from the control signal for precise control at low pressures.

1. Valve for pressure control, comprising a housing with a channel for supplying pressure supply, a drain channel, the output channel of the regulated pressure and the internal bore in which is placed a valve having internal and channel throttle, connecting the channel inlet pressure supply from the left cavity formed by the bore in the body and the left end of the spool and communicating with a channel drain via the control valve, and a channel connecting the output channel of the regulated pressure from the right cavity formed by the bore in the housing, and the right end of the valve and containing a return spring acting on the spool, wherein the spool is made additional channel that connects the right cavity with a channel drain, which is an additional spring-loaded valve, and the canal connecting the output channel of the regulated pressure from the right cavity, an additional throttle.

2. Valve for pressure control, comprising a housing with a channel for supplying pressure supply, a drain channel, the output channel of the regulated pressure and the internal bore in which is placed a valve having inside the channel with the throttle connecting channel inlet pressure supply from the left cavity formed by the bore in the body and the left end of the spool and communicating with a channel drain via the control valve, and a channel connecting the output channel of the regulated pressure from the right cavity formed by the bore in the housing, and the right end of the valve and containing a return spring acting on the spool, characterized in that the rights of the cavity is configured to connection of additional spring-loaded valve with the output channel of the regulated pressure or drain channel.

3. Valve for pressure control according to claim 2, characterized in that the additional spring-loaded valve inside the valve.

4. Valve for pressure control according to claim 2, characterized in that the additional spring-loaded valve is installed in the housing of the main valve.



 

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