JPH0451265Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a valve member of a valve device used, for example, in an air brake circuit of a vehicle or the like.

[Conventional technology]

For example, as a valve device used in equipment constituting the air brake circuit of vehicles, etc.
There is a valve device (excessive stroke detection device) as described in Japanese Patent No. 10233. This valve device is
It is attached to a pneumatically actuated device (brake booster) and is used as a device to detect an excessive stroke of a movable body within the pneumatically actuated device, and when the movable body reaches an excessive stroke, the valve member The valve is opened by moving away from the valve seat, opening a passage communicating between an inlet for introducing compressed air from a compressed air source and an outlet connected to an alarm device, thereby activating the alarm device.

The valve member used here has a T-shaped rubber made by fitting a disc-shaped plate to one end of a guide rod that guides the piston, and molding the plate and the one end. It has a structure with a valve body.

FIG. 4 shows an example of a valve device using this type of valve member. In the figure, 1 is a valve body, which is screwed into a main body part 2 and one end side of the main body part 2. The lid part 3 has a stepped hole 5 that opens at the other end (becomes an inlet 4), and an outlet 6 is formed on the side. This hole 5 is a stepped hole, and the opening end side forms a valve chamber 7 that communicates with the inlet 4, and a piston 9 is inserted into the portion divided by the valve chamber 7 and the valve hole 8. . This piston 9 is a stepped piston in which one end has a large diameter and the other end has a small diameter portion 9C smaller than the diameter of the valve hole 8, and the cylindrical large diameter portion 9A is connected to the large diameter portion 5A of the hole 5. , located in the middle diameter part 5B that communicates the middle diameter part 9B with the outlet 6 of the hole 5, to the valve chamber 7 side by a spring 10 stretched between the bottom of the large diameter part 9A and the bottom of the hole 5. It is inserted into the hole 5 under pressure, and in this state, the narrow diameter part 9
C protrudes into the valve chamber 7, a hole 9b is formed in the medium diameter portion 9B, and a hole 9c communicating with the hole 9b is provided through the narrow diameter portion 9C. A fluid passage 11 is formed between the middle diameter part 9B of the piston 9 and the middle diameter part 5B of the hole 5. Reference numeral 12 denotes a valve member, and a disc-shaped plate 14 is fitted to one end of the guide rod 13, and a T-shaped rubber valve body 15 is formed by molding the plate 14 and the one end. The guide rod 13 slidably passes through the hole 9c of the piston 9 and extends into the hole 9b, and the valve body 15 is urged toward the valve hole 8 by a valve spring 16 and It engages with the end face of the narrow diameter portion 9C. 16 is a valve spring, and 17 is a sealing member.

In this valve device, when fluid is supplied from the inlet 4, the fluid passes from the valve chamber 7 through the valve hole 8,
It exits through the fluid passage 11 to the outlet 6. When the fluid pressure applied to the piston 9 and the lower surface of the valve body 15 of the valve member 12 exceeds a predetermined pressure, the piston 9 moves upward against the spring force of the return spring 10, and the valve body 15
is seated on the valve material around the valve hole 8, and communication between the valve chamber 7 and the fluid passage 11 is cut off.

[The problem that the idea attempts to solve]

By the way, as shown in FIG.
Since molten rubber is injected from the injection port 22 with the plate 14 positioned with the one end side of the rubber plate 14, if the plate 14 is made large in order to obtain the valve body 15 with a large pressure receiving area, the rubber will be ejected into the molding space 21. The ejection pressure received from the molten rubber is no longer uniform, and before molding, the stopper 1 of the guide rod 13
3A and 13B (one stopper 13A is press-molded at a predetermined position on the guide rod 13 so as to change the wall thickness of the rod, and a plate 14 is attached to the rod 13 so as to engage with this stopper 13A). After insertion, the stopper 13B is formed by press molding so that the position of the plate 14 is determined by the stopper 13A and the stopper 13B, and the plate 14 and each stopper 13A and 13B are not caulked), and fixed. If the plate 14 is not fixed, the posture of the plate 14 may be tilted, and if the rubber is fixed as it is, the valve member 12 will be a defective product and productivity will decrease.

The present invention was devised to solve the above problems, and provides a valve member that is free from the possibility that the posture of the plate will change due to the molten rubber injection pressure during molding, and that can increase productivity compared to conventional valve members. The purpose is to

[Means to solve the problem]

In order to achieve the above object, the present invention is such that a conical backup plate is provided on one side of the plate and expands toward the plate.

[Function] In the present invention, when the plate receives the injection pressure of molten rubber, the backup plate that contacts the peripheral side from the center of the surface opposite to the pressure-receiving surface receives the injection pressure via the plate. Tilting of the plate due to injection pressure is prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 30 indicates the entire valve member. Reference numeral 31 is a shaft-shaped guide rod made of metal, and two protrusions 31A and 31B are formed by press molding at positions separated by a short predetermined length from one end of the guide rod. A metal disk-shaped plate 32 is pre-installed between 31B. 33 is a backup plate, the second
As shown in FIG. 3 and FIG. 3, there is a hole 33A in the center with approximately the same diameter as the outer diameter of the guide rod 31, and a cut 33a extending toward the center of the hole 33A is formed around the hole 33A. and guide rod 3
It is fitted into the guide rod 31 from the other end of the guide rod 31, and has a conical or umbrella shape that becomes larger toward the plate 32, and from the other end of the guide rod 31,
It is passed through the guide rod 31 until the lower end peripheral edge touches the surface of the plate 32. Hole 33
A has a diameter that tightly engages the guide rod 31. 34 is a rubber valve body, and the guide rod 3
1, the entire plate 32, and the entire back-up plate 33.
A and a protruding portion 34 protruding from the lower surface of the plate portion 34A.
It has a T-shape consisting of B. This valve member 30
The valve body 34 is attached to the guide rod 31 in the molding space 21 of the mold 20, and the back-up plate 33 is attached to the guide rod 31.
One end of the guide rod 31 of the assembly assembled with the plate 32 and the plate 32 is positioned, and molten rubber 40 is injected into the molding space 21 from the injection port 22. When the injection pressure of the molten rubber 40 acts on the plate 32 during this molding, the plate 32
In its central hole 32A, the protrusion 3 of the guide rod 31
1A and 31B, the central portion is prevented from moving in the axial direction of the guide rod 31, and the peripheral portion is located opposite to the surface receiving the injection pressure of the molten rubber 40. A back-up plate 33 is engaged with the surface, and the above injection pressure is applied to the plate 3.
2, the change in attitude of the plate 32 is prevented, and the probability that the plate 32 will be molded in a bad attitude is significantly reduced. This is because the back-up plate 33 has a conical shape, and the inner periphery of the hole 33A engages with the guide rod 31 in a wedge-like manner, so that the back-up plate 33 receives a pushing force directed toward the other end via the plate 32. This is because the periphery of the hole 33A comes to engage more strongly with the guide rod 31, thereby preventing the guide rod 31 from moving toward the other end.

[Effect of idea]

As explained above, the present invention has a conical back-up plate that expands toward one side of the plate to be rubber molded, which absorbs the jet pressure of molten rubber during molding and prevents the plate from changing its posture. This eliminates the need to mold the plate with the plate in an incorrect orientation, thereby reducing yield and increasing productivity compared to the conventional method.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view showing an embodiment of the present invention, Fig. 2 is a perspective view of a folding plate in the above embodiment, Fig. 3 is a perspective view of a backup plate in the above embodiment, and Fig. 4. 5 is a cross-sectional view of a valve device using a conventional valve member, and FIG. 5 is a diagram for explaining problems with the conventional valve member. 31...Guide rod, 32...Plate, 33
...backup plate, 34...valve body.

Claims (1)

[Scope of utility model registration request] A valve member having a shaft-shaped guide rod, a disc-shaped plate assembled to one end of the guide rod, and a rubber valve body integrally formed to cover the one end of the guide rod and the plate, A valve member having a conical back-up plate on one side of the plate that expands toward the plate.