JPH0245565Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an electromagnetic valve used in a vehicle internal combustion engine, and more particularly to a fixing structure for an elastic member that supports the shaft thereof.

[Conventional technology] In a conventional electromagnetic valve, a stator core wrapped around a solenoid and a moving core connected to the valve are faced to each other, the solenoid is energized to excite the stator core, and the moving core is electromagnetically attracted to the stator core. This is a device that opens the valve provided at the tip of the shaft by moving the shaft that is integrated with the moving core. Further, a return spring is provided in this device, which is displaced as the shaft moves, so that the shaft returns reliably and quickly when the stator core is demagnetized. As an example of this return spring, there is one in which two leaf springs are arranged parallel to each other with an interval provided, and the shaft is supported at two points at the center of each leaf spring. In this case, the means for fixing the periphery of the leaf spring is generally held by a housing or the like. When the leaf spring is elastically deformed,
Using this clamping portion as a fixed point, a restoring force due to elastic deformation is applied to the shaft located at the center.

[Problems to be solved by the invention] In the above embodiment, if the joint surface of the housing, etc., which is the surface that clamps the periphery of the leaf spring, is uneven, the leaf spring will be elastically deformed unevenly, and the shaft will not move. oscillate. This is because the force supporting the periphery of the leaf spring differs locally, so the degree of elastic deformation differs locally. If the shaft oscillates during movement, the accuracy of valve centering may deteriorate and the seating position when the valve is closed may become inaccurate. However, in order to make the joint surface more uniform, there is a limit in terms of processing accuracy, and the workability becomes significantly worse.

This invention solves these problems,
The purpose is to make the support point of the leaf spring clear even if there is some error in the joint surface, to make the elastic deformation uniform, and to make the movement of the shaft linear.

[Means for solving the problems] The electromagnetic valve of the present invention has the following configuration. In other words, a stator core wrapped with a solenoid,
A moving core is arranged facing the stator core so as to be electromagnetically moved into and out of contact with the stator core, a shaft connected to the moving core and provided with a valve at one end, and a communication passage between an intake port and a discharge port formed in the housing are connected to the valve. An electromagnetic valve has an elastic member that urges the shaft to close and supports the shaft movably in the axial direction, and the periphery of the elastic member is clamped and fixed by the housing etc., the periphery of which is uneven. It is characterized in that the formed ring-shaped wave washer is clamped and fixed in a state in which it is attached to the elastic member.

[Operation of the invention] Since the corrugated washer is clamped and fixed in contact with the elastic member, the elastic member is necessarily pressed against the surrounding convex portions formed on the corrugated washer.
Therefore, even if the precision of the joint surface is poor and uneven to some extent, the convex portion of the corrugated washer always serves as a support point and clamps the elastic member. Therefore, the fixing point of the elastic member becomes clear regardless of the precision of the joint surfaces. As a result, when the shaft moves, it is prevented from swinging and is made straight. In addition, the centering accuracy of the valve is improved, and the valve is seated in an accurate position when the valve is closed.

[Example] An example of the present invention will be described based on FIGS. 1 and 3. Note that the vertical directions used in the following description are based on the drawings.

FIG. 2 shows a cross section of the electromagnetic valve, and the electromagnetic valve consists of a solenoid part A and a valve part B, which are each constructed separately.

The solenoid part A has a cylindrical case 1, and a stator core 3 in which a solenoid 2 is wound.
is stored. The stator core 3 has a sharp point, and its upper end in the figure is caulked to the center of a plate 4 fixed to the end of the case 1. A resin cap 5 is attached to one end of the case 1, a portion of which forms a coupler socket 6, and a coupler terminal 7 is integrated with the cap 5 so that a portion thereof is exposed. The coupler terminal 7 is electrically connected to the solenoid 2 through a lead wire 8. The other end of the case 1 has a large diameter base 9.
is attached and forms a joint with valve section B.

The valve part B consists of a housing 10 having approximately the same diameter as the case 1, and a single component valve mechanism V inserted into the housing 10. In addition, the valve mechanism V
The details will be described later. A flange 11 is formed at one end of the housing 10 and forms a joint with the solenoid section A. The valve mechanism includes a guide tube 13, a shaft 17, leaf springs 20, 26, a return spring 25, and the like. The guide cylinder 13 is a cylindrical body with a bottom, and is arranged upside down on a step 12 formed in the middle of the housing 10.
4 is directed upward, and an edge 15 is provided that extends further upward from the outer periphery. Note that a vent hole 16 is formed in a part of the outer circumferential wall surface of the guide tube 13, and communicates with a suction port 36, which will be described later. The shaft 17 passes vertically through the center of the guide tube 13.
A cylindrical moving core 18 with a bottom is integrally provided at the top of the shaft 17. A circular leaf spring 20, which is an elastic member, is attached to the moving core 18 by a washer 19, and a corrugated washer 21, which will be described later, surrounds the circular leaf spring 20.
It is designed to be held between the base portion 9 and the tip of the edge portion 15 via. Further, the cylindrical portion of the moving core 18 is designed to accommodate the pointed head of the stator core 3, and a spacer 22 is provided at the center of the bottom.
is provided. A bellows 23 is disposed in the guide tube 13 to surround the shaft 17, and its upper surface is supported by the bottom portion 14, and its lower surface can be engaged with a large diameter portion 24 formed on the shaft 17 when the shaft 17 moves upward. It's summery. Further, a coil-shaped return spring 25 is disposed within the bellows 23 around the shaft 17. A leaf spring 26, which is an elastic member, is provided at the lower end of the guide cylinder 13, and is supported by a flange 27 by pressure on the shaft 17 passing through the center thereof. The periphery of the leaf spring 26 is connected to the lower end of the guide tube 13 and the stepped portion 1 via a wave washer 31, which will be described later.
2. A collar 28 is fitted onto the lower end of the shaft 17, and the valve 3 is integrally attached to the collar 28.
0 is installed. Valve 30 is color 28
It is made by laminating an elastic material such as plastic around the insert 29 which is integrated with the insert 29. valve 30
is fixed to the shaft 17 via a collar 28 by a caulking 32 at the tip of the shaft 17. Therefore, the valve 30, shaft 17, guide cylinder 13, etc. are integrated parts, and by simply storing them in the housing 10, the valve part B
is assembled.

In addition, the valve 30 opens and closes the upper part of the communication passage 33 provided at the bottom of the housing 10.
An initial load upon opening the valve is applied by a coil-shaped adjusting spring 34 disposed within the valve.
This initial load can be adjusted using an adjustment screw 35. The communication passage 33 communicates an intake port 36 and a discharge port 37 that are open on the side of the housing 10, and the intake port 36 communicates with, for example, outside air, and the discharge port 37 communicates with, for example, a carburetor of an internal combustion engine. . In addition, the suction port 36
Although the discharge port 37 can be used by connecting a separate joint 38 as shown in the figure, it can also be directly attached to a carburetor or the like without using the joint 38. Further, the separate solenoid part A and valve part B can be easily integrated by joining the base part 9 and the flange 11 and fixing them with connecting bolts 39 or the like.

FIG. 1 shows the structure of the valve mechanism V in an exploded manner. The valve mechanism V constitutes an integrated unit, and is used with corrugated washers 21 and 31 attached to leaf springs 20 and 26 provided at both ends of the valve mechanism V.

First, in the valve mechanism V, the bellows 23 is placed in the guide tube 13, the return spring 25 is placed in the bellows 23, the leaf springs 20 and 26 are brought into contact with both ends of the guide tube 13, and the shaft 17 is placed in the center of these. , fit the center part of the leaf spring 20 into the groove formed at the joint between the moving core 18 and the shaft 17, and fix it with the ring 19 (see Fig. 2).
The flange 27 is press-fitted from the tip 17a side of the shaft 17, and the plate spring 26 is sandwiched between the large diameter portion 24 and these parts are integrated. A collar 28 having a valve 30 is further fitted onto the shaft 17a, and by caulking the tip of the shaft 17a, the shaft 17 and the valve 3 are connected.
0 is integrated.

Although the corrugated washers 21 and 31 do not directly constitute the valve mechanism V, they are similar to the leaf springs 20 and 2.
By using it in pressure contact with 6, the leaf spring 20,
26 operation is ensured. FIG. 3 is a detailed view of the corrugated washer 21. In addition, waveform washers 3
1 is the same member as the corrugated washer 21. Therefore, only the wave washer 21 will be described below. This corrugated washer 21 is made of a ring-shaped elastic member, and has a convex portion 40 and a concave portion 4 on its circumference.
1 are alternately bent and arranged at regular intervals. These convex portions 40 and concave portions 41 are easily formed by press molding or plastic molding. Since the convex portion 40 and the concave portion 41 are located at the joint surface that holds the leaf springs 20 and 26, one of the convex portion 40 and the concave portion 41 will always hold the leaf springs 20 and 26, regardless of the precision of the joint surfaces. Pressure support. As a result, the leaf springs 20, 26 are always fixed at fixed positions around them, so that each part of the leaf springs 20, 26 is elastically deformed uniformly. Therefore, the vertical movement of the shaft 17 supported at its center is elastically guided without swinging in the left-right direction.

Next, the operation of the electromagnetic valve in this embodiment will be explained. The state shown in FIG. 2 is when the valve is closed, and when the solenoid 2 is energized, a magnetic force is generated in the stator core 3 and the moving core 18 is attracted. Then, the shaft 17 moves upward against the leaf spring 20, return spring 25, and leaf spring 26, the valve 30 opens, and the suction port 36 and the discharge port 37 communicate with each other through the communication passage 33. As a result, outside air is sent from the suction port 36, through the communication path 33, through the discharge port 37, and out of the apparatus. When the power is turned off,
The stator core 3 and the moving core 18 are directly separated, and the shaft 17 is moved downward by the leaf spring 20, return spring 25, and leaf spring 26, and the valve 30
is closed, the communication passage 33 is closed, and the suction port 36 is closed.
The inflow of outside air from the discharge port 37 is cut off. At this time, since the leaf spring 26, return spring 25, etc. are located near the valve 30, the center of the valve 30 coincides with the center of the constantly communicating passage 33, ensuring the valve is closed.

In addition, the guide tube 13, the leaf spring 20, and the leaf spring 2
6 and the like prevent the shaft 17 from swinging in the lateral direction during vertical movement, so the valve can be opened and closed accurately.

[Effects of the invention] Since the corrugated washer is clamped and fixed in a state in which it is attached to the elastic member, the fixing point of the elastic member becomes clear regardless of the accuracy of the joint surface. As a result, rocking when the shaft moves is prevented, the shaft can move linearly, and the accuracy of valve centering can be improved. Therefore, when the valve is closed, the seating position of the valve is kept constant to ensure accurate operation. Furthermore, since there is no need to make the precision of the joint surface strict, workability is significantly improved.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is an exploded perspective view of the main parts, FIG. 2 is a sectional view, and FIG. 3 is a perspective view of the main parts. Explanation of symbols: A...Solenoid part, B...Valve part, V...Valve mechanism, 1...Case, 2...
... Solenoid, 3 ... Stator core, 10 ... Housing, 13 ... Guide cylinder, 17 ... Shaft, 18 ... Moving core, 20, 26 ... Leaf spring (elastic member), 21, 31 ... Wave shape washer,
30...Valve, 33...Communication path.

Claims (1)

[Scope of utility model registration request] A stator core wrapped with a solenoid, a moving core placed facing the stator core so as to electromagnetically approach and separate from it, a shaft connected to the moving core and provided with a valve at one end, and a suction port and discharge formed in the housing. energizing the shaft so that the valve closes a communication path with the port;
and an elastic member that supports the shaft movably in the axial direction, the electromagnetic valve having a periphery of the elastic member clamped and fixed by the housing etc., in which a ring-shaped corrugated washer with an uneven periphery is attached to the elastic member. An electromagnetic valve characterized by being clamped and fixed in a state attached to.