JPH0634196Y2 - Housing structure - Google Patents

Description

[Detailed description of the device] [Industrial applications]

This invention discloses a housing structure for a hydraulic control valve for controlling hydraulic pressure of, for example, a rear wheel brake of a vehicle, or other valve, and further for other mechanical parts, in particular, a pair of main body members constituting the housing. The present invention relates to a device provided with a seal member at a connecting portion.

[Prior art]

One of the devices having a housing structure of this type is a hydraulic pressure control valve called a screw-in-P valve for a vehicle. FIG. 3 shows a conventional example of the hydraulic pressure control valve, which is well known in itself (see Japanese Utility Model Laid-Open No. 2-107558). The hydraulic pressure control valve 10 shown in FIG. 3 has an inlet 14 on one side of the housing 12 and an outlet 16 on the other side, the inlet 14 side being the discharge portion of a master cylinder (not shown), and the outlet 16 side being Each is connected to a pipe for a rear wheel braking device (not shown). In the housing 12, in addition to the stepped control piston 20, there is a preload spring 24 that biases the control piston 20 toward the outlet 16 side, and a poppet valve element 22 on the inlet 14 side. One end of the control piston 20 is the valve seat 20a,
When the hydraulic pressure discharged from the master cylinder side is low,
The force of the preload spring 24 causes the poppet valve body 22 to move to the valve seat 20a.
Away from, the valve is open. However, when the hydraulic pressure reaches a predetermined value, the force acting on the difference area portion of the large and small diameter portions of the control piston 20 overcomes the force of the preload spring 24, and the control piston
20 moves to the entrance 14 side. By the movement, poppet valve body
22 is seated on the valve seat 20a, and a known hydraulic pressure control is performed. Now, looking at the housing 12 of such a hydraulic control valve 10,
The housing 12 includes a pair of first and second main body members 121 and 122 that are divided into two. The pair of body members 12
Reference numeral 1,122 denotes a first body member 121 having a small-diameter cylindrical portion 121a.
However, the main body of the housing 12 is formed by fitting the inner circumference of the second main body member 122 having the large-diameter cylindrical portion 122a and screwing them together. The housing 12 has a space including the pressureless chamber 30 therein, and the inner circumference of the large-diameter cylindrical portion 122a and the small-diameter cylindrical portion 12
An annular space 40 is formed between the outer circumference of 1a and the outer circumference. The annular space 40 is a space for arranging an annular seal member 50 that allows a fluid flow from the pressureless chamber 30 side to the outside and prohibits a reverse flow thereof. Conventionally, a so-called cup seal having a U-shaped cross section is used as the seal member 50 arranged in the annular space 40.

[Problems to be solved by the device]

There is one problem with mounting the cup seal.
That is, since the cup seal 50 in the annular space 40 cannot be seen from the outside, it cannot be easily checked whether it is properly installed. However, since the cup seal 50 has directionality, it has an annular space.
If it is installed inside the 40 in the opposite direction, it will not function properly. Therefore, the directional cup seal 50
Checking after assembly is required as long as is used.

[Disclosure of device]

The present invention is intended to provide a technique capable of eliminating a troublesome check after assembling, and when a pair of main body members are joined, the seal member has directionality from that point, and the seal member has a directivity. The feature is that it is inevitably installed correctly. From the viewpoint of the configuration, in the present invention, as shown in FIGS. 1 and 2 corresponding to the embodiment, an annular seal member 500 for sealing the coupling portion is a small-diameter cylinder of the first main body member 121. A base portion 510 that fits on the outer periphery of the portion 121a, and a flexible portion 520 that protrudes radially outward from the center of the outer peripheral side of the base portion 510 in a direction orthogonal to the axes of the pair of main body members 121 and 122. And its flexible portion 520 has a base portion 510.
Is longer than the distance between the outer peripheral surface of the base portion 510 and the inner peripheral surface of the large-diameter cylindrical portion 122a, and the first and second main body members 121, 122 are joined together. The tip portion 521 of the flexible portion 520 in the upright shape has a large-diameter cylindrical portion 12.
The large-diameter cylindrical portion 122 is pushed by 2a and bends in a direction from the second main body member 122 side toward the first main body member 121 side.
It has the flexibility to contact the inner surface of a. The annular seal member 500 preferably has a shape that is plane-symmetrical with respect to a plane orthogonal to the axes of the pair of main body members 121 and 122 from the economical viewpoint of the molding die. However, the plane symmetry is not always necessary. The protruding flexible part 520
When the pair of main body members 121 and 122 are joined, the shape can be changed within a range in which they can be bent in one direction by receiving a force in the axial direction based on the joining.

【Example】

The embodiment is an example in the case of being applied to the liquid pressure control valve described above. The difference between the hydraulic control valve 100 to which the present invention is applied and the conventional hydraulic control valve 10 described above is that a pair of main body members is used.
This is a seal member that seals the joint portion of 121 and 122. Therefore, the seal member will be mainly described. The same components are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 2 shows the cross-sectional shape of the seal member 500 used in this invention. (A) of the figure is the shape before mounting,
(B) is the shape after mounting. As shown in FIG. 2, particularly (A), an annular seal member 500, which is a molded rubber product, has a base 510 having a rectangular cross section and a dorsal fin on the center of the outer peripheral surface of the base 510. And a flexible part 520 that stands. The base portion 510 is a ring extending around the circumference, and its inner diameter is slightly smaller than the outer diameter of the cylindrical portion 121a of the first main body member 121. A groove 510d extending around the center of the inner circumference of the base 510
The inner diameter of the groove 510d is substantially the same as the outer diameter of the tubular portion 121a. The central groove 510d divides the inner circumference of the base portion 510 into two parts 511 and 512 to enhance the sealing performance with the outer circumferential side of the cylindrical portion 121a, and also provides sufficient support for bending the flexible portion 520. On the other hand, the flexible portion 520 standing on the outer peripheral side of the base portion 510 also extends for one round, but its cross-sectional shape is a narrow rectangular shape,
The cross-sectional shape of the tip portion 521 is circular. Such a flexible portion 520 stands vertically on the base portion 510, and the protruding length from the base portion 510 is larger than the distance between the outer peripheral surface of the base portion 510 and the inner peripheral surface of the large tubular portion 122a. There is. When the first main body member 121 and the second main body member 122 are joined, first, the seal member 500 is provided with the outer circumference of the small-diameter cylindrical portion 121a of the first main body member 121, more specifically, the male screw portion 121m and the step. It is attached to the outer peripheral portion between the surface 121w. Seal member 500
Has a plane-symmetrical shape, it is not necessary to pay attention to the directionality when mounting on the first main body portion 121. Moreover, even after mounting on the first main body member 121, the base portion 510 is deformed so as to have a slightly larger diameter, but the flexible portion 520 is still standing vertically. However, the first body member
When the 121 and the second body member 122 are combined, the flexible portion 520
Is pushed by the end of the cylindrical portion 122a of the second main body member 122 and inevitably bends in the direction from the second main body member 122 side toward the first main body member 121 side. Thereby, the flexible portion 520 having a circular cross section
The side surface of the front end portion 521 of the above-mentioned contact the inner circumference of the cylindrical portion 122a of the second main body member 122, and exerts a sealing function. As can be seen from the above description, in the hydraulic control valve 100 to which the present invention is applied, it is not necessary to pay attention to the direction of assembly when the seal member 500 itself is assembled, and moreover, the pair of main body members 121 and 122 are combined. If so, the flexible portion 520 inevitably bends in a predetermined direction and exhibits a necessary sealing function.
Therefore, not only the assembling work becomes easy, but also the assembling of the seal member 500 does not need to be checked at all. The seal member 500 is usually obtained as a molded product,
In that case, the parting line based on the mold split is a flexible part.
Since it occurs at the center of the head of the tip portion 521 of the 520, the flexible portion 520
The bending of the part separates the parting line from the sealing part and does not impair the sealing function.

[Effect of device]

According to this invention, the seal member 500 is attached to the pair of main body members 1
Since the direction is first generated when the 21,122 are joined, it is possible to completely eliminate the check work after the assembly of the seal member 500.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a view showing a structure of a seal member,
Is a sectional view showing a shape before mounting, (B) is a sectional view showing a shape after mounting, and FIG. 3 is a sectional view showing a conventional example. 10 ... Liquid pressure control valve, 121 ... First main body member, 121a ...
Small-diameter cylinder part, 122 ... Second body member, 122a ... Large-diameter cylinder part, 30 ... pressureless chamber, 40 ... annular cavity, 500 ... seal member, 510 ... base part, 520 ... … Flexible part.

Claims (2)

[Scope of utility model registration request] 1. A first main body member having a small-diameter cylindrical portion at an end and a second main body member having a large-diameter cylindrical portion at an end, and a pair of the first and second main bodies. A member is joined to each other by fitting the tubular parts together, and a void containing an unpressurized chamber inside, an annular void between the inner circumference of the large-diameter tubular part and the outer circumference of the small-diameter tubular part. A one-way valve is provided in a housing structure in which an annular seal member is formed in each of the annular cavities that allows a fluid flow from the internal pressureless chamber side to the outside and prohibits the opposite flow. The annular seal member to be formed is a base portion that fits into the outer periphery of the small-diameter cylindrical portion, and a direction that is orthogonal to the axis of the pair of main body members from the center of the outer peripheral side of the base portion, and has a diameter over the entire circumference And a flexible portion protruding outward in the direction, and the flexible portion is formed from the base portion. Greater than the distance between the inner peripheral surface of the outer peripheral surface and large-diameter cylindrical portion of the protruding length of the base, moreover, in response to coupling the first and second two body members,
The distal end portion of the upright flexible portion is pushed by the large-diameter tubular portion, and is bent in the direction from the second main body member side toward the first main body member side. A housing structure that has the flexibility to come into contact with the inner peripheral surface of the housing. 2. The seal member has a shape that is plane-symmetric with respect to a plane orthogonal to the axes of the pair of main body members.
The housing structure according to claim 1.