JPH04107586U - solenoid valve - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to provide a solenoid valve that can minimize the influence of the viscosity of a control fluid acting on the plunger surface, thereby improving control characteristics. In particular, we aim to improve the control characteristics of low-temperature fluids such as oil, which have large viscous resistance. [Structure] A viscous resistance reducing part 9 is provided on the outer circumferential surface of the plunger 4, such as a width across flat structure for partially enlarging the gap with the inner circumferential surface of the bearing part 5 to reduce the viscous resistance of the control fluid, and ,
It is characterized in that the spring 6 is inserted into a spring chamber 10 formed on the end face of the center post 2.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention can be applied to automatic transmissions installed in automobiles, for example. It relates to solenoid valves used in hydraulic control valves and various control valves.

0002

[Conventional technology]

Examples of conventional solenoid valves of this type include those shown in FIGS. 7 and 8. Ru. That is, the center post 100 that functions as a fixed iron core, and the center post 100 that functions as a fixed iron core. A coil 101 arranged to surround the center post 100 and an end face of the center post 100. a plunger 102 functioning as a movable core disposed facing the plunger 102; 102 coaxially and slidably guided by the center post 100 The plunger 10 is interposed between the plunger 102 and the end face of the center post 100. a spring 104 that urges the center post 2 away from the center post 100; A valve part 105 that opens and closes as the plunger 102 moves back and forth. Ru. Then, the control fluid is passed through the sliding part between the plunger 102 and the bearing part 103. so that it flows into the space 106 between the plunger 102 and the center post 100. It was turning into a sea urchin. Further, the spring 104 is attached to the center post of the plunger 102. It was installed in a spring chamber 107 provided on the opposite surface of the spring 100.

0003

[Problem that the idea aims to solve]

However, in the case of the above-mentioned prior art, the control fluid is connected to the plunger 102 and the shaft. When passing through the sliding part with the receiving part 103, the plunger is moved by the viscous resistance of the control fluid. There is a problem that the movement of 102 is ignored and the control characteristics of the solenoid valve change. Ta.

0004 Further, as in this embodiment, a spring chamber 10 is provided in the plunger 102 on the moving side. 7, not only the outer circumference of the plunger 102 but also this spring chamber 1 07 Viscous resistance also acted on the inner peripheral surface, which had a negative impact on control characteristics. .

[0005] In particular, when used as a hydraulic control valve, the viscosity of the hydraulic fluid to be controlled at low temperatures is The shear force due to viscosity that acts on the plunger 102 during operation is large, and the oil Phenomena such as fluctuations in pressure control and sudden pressure drops are occurring. this Variations in the characteristics of solenoid valves such as This has an adverse effect on the operating characteristics of the system. This kind of problem occurs when the coil 101 The pressure and flow rate are controlled by intermittently opening and closing the valve section 105 by passing a periodic current. This is noticeable in the case of duty-controlled solenoid valves.

[0006] In addition, as shown in Figure 9, hydraulic oil operates in the space between the plunger and the center post. The temperature of the hydraulic oil was difficult to rise because oil etc. remained and was difficult to discharge.

[0007] The present invention was devised to solve the above-mentioned problems of the prior art, and its purpose is to The purpose of this is to minimize the influence of the viscosity of the control fluid acting on the plunger surface. The object of the present invention is to provide a solenoid valve that can be operated in a controlled manner, thereby improving control characteristics.

[0008]

[Means to solve the problem]

In order to achieve the above purpose, the present invention uses a sensor that functions as a fixed iron core. a tap post, a coil arranged to surround the center post, and a coil arranged to surround the center post; A plunger that functions as a movable iron core that is placed opposite to the end face of the post, and A bearing part for slidingly guiding the plunger coaxially with the center post, and a plunger. The plunger is interposed between the plunger and the end face of the center post to separate the plunger from the center post. A spring that biases the direction and a valve that opens and closes as the plunger moves back and forth. and a control fluid is plunged through the sliding part between the plunger and the bearing. In the solenoid valve that allows circulation in the space between the camera and the center post, control by partially increasing a gap between the outer circumferential surface of the plunger and the inner circumferential surface of the bearing; A viscous resistance reducing part with a small contact area with the fluid is provided, and the spring is It is characterized by being inserted into a spring chamber formed on the end face of the center post. .

[0009] The surface of the plunger facing the center post is inserted into the spring chamber of the center post. It is effective to provide a protrusion that can be freely inserted.

0010

[Effect]

In the solenoid valve with the above configuration, a viscous resistance reducing device is installed on the outer periphery of the plunger. The surface area of the outer circumferential surface of the plunger is partially reduced, and the plunger The viscous resistance of the control fluid acting on the jar is reduced.

[0011] In addition, since the spring chamber is located on the fixed center post side, the plunger The viscous resistance of the control fluid that acts is only the force that acts on the outer peripheral surface of the plunger.

0012 On the other hand, if it is installed on the end face of the plunger on the center post side, it will respond to the movement of the plunger. The spring is inserted into and removed from the spring chamber and gets stuck in the space between the center post and the plunger. The remaining control fluid is forcibly discharged.

[0013]

【Example】

The present invention will be explained below based on the illustrated embodiments. Electric power according to an embodiment of the present invention In FIGS. 1 and 2 showing a solenoid valve, this solenoid valve 1 generally includes a solenoid part A, It consists of a valve part 7 that is assembled integrally with this solenoid part A. Ru.

[0014] The solenoid part A includes a center post 2 that functions as a fixed iron core, and a center post 2 that functions as a fixed iron core. A coil 3 is arranged to surround the center post 2, and a coil 3 is arranged to surround the center post 2. A plunger 4 that functions as a movable iron core is provided. And this A bearing portion 5 for slidably guiding the plunger 4 coaxially with the center post 2. is provided between the plunger 4 and the end face of the center post 2, and the plunger 4 is centered on the center post. A spring 6 is interposed that biases it in a direction away from the striker 2.

[0015] The bearing part 5 is a thin cylindrical member, and one end thereof is fixed to the outer circumference of the end of the center post 2. and the other end is attached to the yoke plate 12 attached to the end of the case 10 on the valve part 7 side. connected.

[0016] The coil 3 is housed in a cylindrical case 10, and the valve of the case 10 An upper plate 11 is fixed to the opening end on the opposite side to the section 7, and the upper plate 1 A center post 2 is integrally screwed and fixed to the inner periphery of the center post 1. And centapo The control fluid is supplied to the plunger 4 through the sliding part between the plunger 4 and the bearing part 5. and the center post 2 in a space 8.

[0017] The bearing part 5 is a thin cylindrical member, and one end thereof is fixed to the outer circumference of the end of the center post 2. and the other end is attached to the yoke plate 12 attached to the end of the case 10 on the valve part 7 side. connected. The valve portion 7 is provided on the side opposite to the center post 2 of the plunger 4, A valve seat 17 is arranged, and the tip of the plunger 4 is moved toward and away from this valve seat 17. This opens and closes the flow path.

[0018] Then, the gap between the outer circumference of the plunger 4 and the inner circumference of the bearing part 5 is partially enlarged. A viscous resistance reducing section 9 is provided to reduce the viscous resistance of the control fluid. child The viscous resistance reducing portion 9 is formed by forming a width across flat portion on the outer peripheral surface of the cylindrical plunger 4. It is composed of That is, in this viscous resistance reducing part 9, the plunge The outer peripheral surface of the carrier 4 has two flat surfaces 13 and 14, and the flat surface 13 is the same as the circumferential surface. , 14, the contact area with the working fluid is smaller than that of the circumferential surface.

[0019] Furthermore, the end surface of the center post 2 has a spring 6 for mounting the spring 6 thereon. A chamber 15 is formed. Also, the surface of the plunger 4 facing the center post 2 In this case, a protrusion 16 that can be freely inserted and removed is provided in the spring chamber 15 of the center post 2. There is.

[0020] In the solenoid valve having the above configuration, a viscous resistance lightener provided on the outer periphery of the plunger 4 In the reduced portion 9, the surface area of the outer peripheral surface of the plunger 4 is partially reduced, The viscous resistance of the control fluid acting on the plunger 4 is reduced. In addition, since the spring chamber 15 is provided on the fixed center post 2 side, the plan The viscous resistance of the control fluid acting on the plunger 4 is only the force acting on the outer peripheral surface of the plunger 4. becomes.

[0021] On the other hand, the protrusion 16 provided on the end surface of the plunger 4 on the side of the center post 2 is shown in FIG. As the plunger 4 moves, it is inserted into and removed from the spring chamber 15, and the The control fluid remaining in the space between the plunger post 2 and the plunger 4 can be forcibly discharged. I can do that.

[0022] However, even if the protrusion 16 is not provided as shown in FIG. Since the viscous resistance is reduced by the viscous resistance reducing part 9, the viscous resistance is reduced compared to the conventional one. The influence of sexual resistance can be reduced, and control characteristics can be improved. just , since control fluid such as low-temperature oil tends to stay in the area shown by diagonal lines in the figure, the protrusion 1 It is more effective to provide 6.

[0023] 5 and 6 show the control characteristics of the electromagnetic valve of the present invention and the conventional solenoid valve. this graph Controls the pressure by intermittently opening and closing valve part B using a periodic current through a solenoid valve. The horizontal axis shows the duty ratio and the vertical axis shows the control pressure. In Figure 6 As shown in the figure, with the conventional model, there are fluctuations around high pressure and sudden fluctuations around low pressure. A drastic pressure drop is observed, but in this invention, as shown in Figure 5, the pressure drop is reduced from high to low. You can see that it changes smoothly.

[0024] Of course, the control method for solenoid valves is limited to such duty control. Of course, various other types of control can be performed instead.

[0025] In the above embodiments, the configuration of the valve section is not limited to the illustrated example. In other words, the control fluid in the valve part flows through the sliding part between the bearing part and the plunger. Various configurations can be adopted as long as it circulates in the space between the center post and the center post. can.

[0026]

[Effect of the idea]

The present invention has the above-described structure and function, and is provided on the outer periphery of the plunger. In the viscous resistance reducing part, the gap between the sliding part and the bearing is partially enlarged. This reduces the viscous resistance of the control fluid acting on the plunger, and also reduces the viscous resistance of the control fluid acting on the plunger. Since the chamber is provided on the fixed center post side, the control fluid acting on the plunger is The viscous resistance is reduced to only the force acting on the outer circumferential surface of the plunger, further reducing the viscous resistance. The control characteristics can be improved.

[0027] On the other hand, by providing a protrusion on the end face of the center post side of the plunger, the center post The control fluid that remains in the space between the strike and the plunger can be forcibly discharged. .

[Brief explanation of drawings]

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

FIG. 2 is a perspective view of the plunger of FIG. 1;

FIG. 3 is an explanatory diagram showing a flow state of control fluid between the plunger and the end face of the center post in FIG. 1;

FIG. 4 is an explanatory diagram of the case in which there is no protrusion in FIG. 3;

FIG. 5 is a graph showing the relationship between the duty ratio and control pressure of the solenoid valve in FIG. 1;

FIG. 6 is a graph showing the relationship between the duty ratio and control pressure of a conventional solenoid valve.

FIG. 7 is a longitudinal cross-sectional view of a conventional solenoid valve.

FIG. 8 is a perspective view of the plunger of FIG. 7;

FIG. 9 is a partially enlarged sectional view of FIG. 7;

[Explanation of symbols]

1 Solenoid valve 2 Center post 3 coil 4 Plunger 5 Bearing part 6 spring 7 Valve part 8 Space 9 Viscous resistance reduction part 10 cases 11 Upper plate 12 Yoke plate 13,14 Flat part 15 Spring chamber 16 protrusion 17 Valve seat

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[Procedural amendment]

[Submission date] April 29, 1992

[Procedural amendment 1]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 1

[Correction method] Change

[Correction details]

[Figure 1]

[Procedural amendment 2]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction details]

[Figure 2]

[Procedural amendment 3]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 7

[Correction method] Change

[Correction details]

[Figure 7]

[Procedural amendment 4]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction details]

[Figure 8]

Claims (2)

[Scope of utility model registration request] [Claim 1] A center post that functions as a fixed iron core;
a coil arranged to surround the center post;
a plunger functioning as a movable iron core disposed opposite to the center post end face; a bearing portion for coaxially and slidably guiding the plunger with the center post; and a plunger interposed between the plunger and the center post end face. It is equipped with a spring that biases the plunger in a direction to separate it from the center post, and a valve section that opens and closes as the plunger moves back and forth, and the control fluid is passed between the plunger and the center post through the sliding section between the plunger and the bearing. In the electromagnetic valve that flows in a space between the plunger and the plunger, a viscous resistance reducing portion is provided on the outer circumferential surface of the plunger, the gap between the plunger and the inner circumferential surface of the bearing being partially enlarged to reduce the contact area with the control fluid;
A solenoid valve characterized in that the spring is inserted into a spring chamber formed on an end face of a center post. 2. The electromagnetic valve according to claim 1, wherein a surface of the plunger facing the center post is provided with a protrusion that can be inserted into and removed from the spring chamber of the center post.