JP2566435Y2 - Temperature compensation structure of pressure 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 temperature compensation structure for a pressure control valve mainly used in a hydraulic circuit.

[0002]

2. Description of the Related Art Conventionally, a hydraulic control circuit such as an automatic transmission uses a pressure control valve as shown in FIG. That is, the pressure control valve is an electromagnetic valve, and the supply passage 32, the output passage 33, and the discharge passage 34, which are communicated through the hole 35, are formed in the valve body 31. . A tapered surface 36 serving as a first valve seat is formed at a communicating portion between the hole 35 and the supply flow path 32,
A spherical body 38 as a first valve body biased toward the valve seat 36 by a spring 37 is accommodated in the supply flow path 32. In the valve body 31, a solenoid 39 and an iron core 4 are provided.
An electromagnet 41 made of zero and a plunger 42 serving as a second valve body that is actuated by an attractive force of the electromagnet 41 and a spring 44 contracted in the iron core 40 are provided. A push rod 43 that fits loosely into the hole 35 is formed integrally with the plunger 42. The push rod 43 separates the sphere 38 from the tapered surface 36, and the push rod 43 The formed tapered surface 45 serves as the second valve seat.
Is in contact with the opening edge 46.

In such a configuration, in the state shown in FIG. 3, oil supplied to the supply flow path 32 can flow through the output flow path 33. On the other hand, when the plunger 42 is attracted to the electromagnet 41, the sphere 36 is seated on the tapered surface 36, and the tapered surface 46 is
Is separated from the opening edge 45. Therefore, the supply channel 3
The flow of oil from 2 to the output flow path 33 is cut off, and the flow of oil from the output flow path 33 to the discharge flow path 34 becomes possible. In the solenoid valve, an input pulse is applied to the solenoid 39 so that the plunger 42
Is operated, the flow rate of the oil supplied to the output flow path 33 and the flow rate of the oil discharged to the discharge flow path 34 are changed according to the duty ratio of the input pulse, thereby variably controlling the output pressure on the output flow path 33 side. It is.

[0004]

However, in such a conventional pressure control valve, a throttle on the supply flow passage 32 side formed between the spherical body 38 and the tapered surface 36 at the time of its operation is provided. Both the tapered surface 45 and the aperture on the discharge channel 34 side formed between the push rod 43 and the aperture edge 46 have different aperture shapes and aperture areas, that is, have different aperture shapes. ing. Therefore, when the viscosity of the oil flowing through the inside of the valve body 31 changes due to a temperature change, the spherical body 38 is moved to the tapered surface 3.
6 is the same as the flow rate of the oil supplied to the output flow path 33 at the time of the opening operation separated from the opening edge 46 and the flow rate of the oil discharged to the discharge flow path 34 at the time of the closing operation separated from the opening edge 46. did not become. As a result, there is a problem that a predetermined output pressure cannot be obtained when controlling the output pressure on the output flow path 33 side.

The present invention has been made in view of such a conventional problem, and makes it possible to control the output pressure of an output flow path without being affected by a change in temperature of a fluid.
An object of the present invention is to provide a temperature compensation structure for a pressure control valve.

[0006]

According to the present invention, a supply passage, an output passage and a discharge passage are provided in a valve body, and the supply passage and the output flow passage are provided in the valve body. seat the first valve is provided in the communicating portion between the road, the the communication portion of the output flow path and said discharge flow path with seat a second valve is provided, away seated on the first valve seat wherein the first valve body second to
A second valve element which is detachably seated on the valve seat of the first valve element, the first valve element and the second valve element are alternately seated on the first valve seat and the second valve seat, and the output is performed. a pressure control valve for controlling the output pressure of the flow channel, having a first valve seat and the second valve seat and the same opening shape you face across the output channel, the first A valve body is housed in the supply flow path, and
It said second valve body is accommodated in the discharge passage, while the first valve body and the second valve body is Ru sphere der having the same outer shape, the discharge flow and the supply flow path Both on the road and
The first valve body and the second valve body are urged in a seating direction.
And connecting the first valve body and the second valve body to the output flow path.
Biasing means for maintaining the contact state at all times via
It is provided .

[0007]

In the above construction , the first member is provided inside the valve body.
Each of the valve body and the second valve body includes a first valve seat and a second valve seat.
By alternately taking off and seating, the output pressure of the output flow path
Controlled. At this time, the first valve body and the second valve body
Bias provided in both the supply flow path and the discharge flow path
The contact state is always maintained by the means. Therefore, the amount of separation when the first valve element is separated from the first valve seat is equal to the amount of separation when the second valve element is separated from the second valve seat. On the other hand, the second valve seat has the same opening shape as the first valve seat, and the second valve body has the same shape as the first valve body. Is formed in the communicating portion between the supply flow path and the output flow path when the second valve body is separated from the first valve seat, and the output flow when the second valve element is separated from the second valve seat. The shape of the throttle formed in the communicating portion between the passage and the discharge passage is the same. Therefore, fluids such as oil
The flow resistance when flowing from the supply flow path to the output flow path and the flow resistance when flowing from the output flow path to the discharge flow path are always the same flow resistance regardless of the viscosity change of the fluid. Will be maintained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a solenoid valve according to the present invention.
, An output flow path 3 and a discharge flow path 4 are formed. A tapered first valve seat 5 that expands toward the supply flow path 2 is formed at a communication portion between the supply flow path 2 and the output flow path 3. The first valve seat 5 is provided in the supply flow path 2.
And a first sphere 6 which is a first valve body whose part is swelled is accommodated in the output flow path 3, and the first sphere 6 is provided in the supply flow path 2. The first contracted inside
Are biased toward the first valve seat 5 by the spring 7. On the other hand, a communication portion between the output flow path 3 and the discharge flow path 4 is opposed to the first valve seat with the output flow path 3 therebetween, and is expanded toward the discharge flow path 4. A second valve seat 8 having the same opening shape as the first valve seat is formed.
Further, a second sphere 9 which is a second valve having the same outer shape as the first sphere is accommodated in the discharge channel 4, and the second sphere 9 is provided with the second valve seat. 8 and is in contact with the first sphere in the output flow path 3. The second sphere 9 is contracted in the discharge flow path 4 and urged in the second valve seat direction by a second spring 10 having a smaller urging force than the first spring 7. ing.

On the other hand, the solenoid valve body 1 includes an electromagnet 13 having a solenoid 11 and an iron core 12, and a plunger 1 whose one end abuts on the second sphere 9 in the discharge passage 4.
And 4. Between the other end of the plunger 14 and the iron core 12, a third spring 15 having a larger urging force than the first spring 7 is contracted. The plunger 14 seats the second sphere 9 on the second valve seat by the urging force of the third spring 15 and at the same time the first sphere 6 through the second sphere 9.
, And the first spring 7 is pressed against the first spring 7.
Are separated from the first valve seat 5. Therefore, the supply flow path 2 and the output flow path 3 are communicated, and the communication between the output flow path 3 and the discharge flow path 4 is shut off.

In this configuration, the solenoid 11
When the plunger 14 is attracted toward the iron core 12 along with the excitation (arrow A), the first sphere 6 is urged by the first spring 7 and seats on the first valve seat 5. .
At this time, the second sphere 9 is connected to the second spring 10
Therefore, it is separated from the second valve seat 8 while being in contact with the first sphere 6. Therefore, the distance between the first sphere 6 and the first valve seat 5 when the solenoid valve body 1 is opened (FIGS. 1 and 2) and the second distance when the solenoid valve body 1 is closed.
The distance between the sphere 9 and the second valve seat 8 is the same. In addition, the second valve seat 8 and the first valve seat 5 have the same opening shape, and the second sphere 9 and the first sphere 6 have the same outer shape. A throttle formed in a communicating portion between the supply flow path 2 and the output flow path 3 when the plunger 14 is not operated, and a communication between the output flow path 3 and the discharge flow path 4 when the plunger 14 is operated. The shape of the aperture formed in the portion becomes the same.

Therefore, when the supply flow path 2 is communicated with the primary pressure side in the hydraulic circuit, the flow resistance of the oil flowing from the supply flow path 2 to the output flow path 3 and the discharge flow from the output flow path 3 Road 4
The flow resistance of the oil flowing into the oil is always maintained the same regardless of the viscosity of the oil. Therefore, even when the viscosity of the oil changes due to the temperature change, the amount of oil supplied to the output flow path 3 during the opening operation and the discharge of the oil discharged from the discharge flow path 4 during the closing operation The amount can always be the same as the amount. As a result, it is possible to obtain a predetermined output pressure when controlling the output pressure on the output flow path 3 side.

[0012]

[Effect of the Invention] As described above, in the present invention,
In a pressure control valve having a supply flow path, an output flow path, and a discharge flow path, and controlling an output pressure of the output flow path, a pressure control valve formed in a communication portion between the supply flow path and the output flow path of the valve body. A throttle formed by the first valve seat and the first valve body seated on the first valve seat; and a second valve formed in a communicating portion between the output flow passage and the discharge flow passage.
And the throttle shape formed by the second valve body seated on the second valve seat is the same as that of the throttle valve.

Therefore, the flow resistance when a fluid such as oil flows from the supply flow path to the output flow path and the flow resistance when the fluid flows from the output flow path to the discharge flow path are determined by the oil resistance. Irrespective of the viscosity. Therefore, even when the viscosity of the fluid changes with the temperature change of the fluid, the fluid flow rate when supplied to the output flow path and the fluid flow rate when discharged from the output flow path are the same flow rate. It is possible to control the output pressure of the output flow path to a predetermined output pressure without being affected by a change in the temperature of the fluid.

[Brief description of the drawings]

FIG. 1 is a sectional view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is an enlarged view shown by an arrow A in FIG.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic valve main body (valve main body) 2 supply flow path 3 output flow path 4 discharge flow path 5 first valve seat 6 first sphere (first valve body) 8 second valve seat 9 second sphere ( 2nd valve body)

Claims (1)

(57) [Scope of request for utility model registration] A valve body provided with a supply flow path, an output flow path, and a discharge flow path, and a communication portion between the supply flow path and the output flow path provided with a first valve seat; A second valve seat is provided in a communication portion between the output flow path and the discharge flow path,
A first valve body that is detached and seated on the first valve seat and a second valve body that is detached and seated on the second valve seat, wherein the first valve body and the second valve body are alternately arranged; wherein the first valve seat and a pressure control valve which is seated for controlling the output pressure of the output channel to said second valve seat, said first valve seat and the second valve seat and said output flow has the same opening shape you opposed across the road, the first valve body is accommodated in the supply passage, and before
Serial second valve body is accommodated in the discharge passage, while the first valve body and the second valve body is Ru sphere <br/> Oh having the same outer shape, the supply channel And the discharge channel,
Urging the first valve body and the second valve body in a seating direction;
The first valve body and the second valve body are connected via the output flow path.
Biasing means to maintain the contact
Temperature compensation structure of the pressure control valve, characterized in that eclipse the.