JP2534386Y2 - Valve casing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve casing suitable for a valve which is made into a cartridge in advance, such as a hydraulic pressure control valve which is integrally assembled to a master cylinder for a brake.

[0002]

2. Description of the Related Art For example, Japanese Utility Model Application Laid-Open No. 3-96.
According to the brake fluid pressure control valve disclosed in Japanese Patent No. 263, when the rear wheel pressure becomes equal to or higher than a predetermined fluid pressure during normal brake operation, the rear wheel pressure is controlled to increase the fluid pressure with respect to the front wheels. It is reduced at a fixed ratio to ensure stable braking force. On the other hand, when the front wheel side pressure does not increase in an emergency, the rear wheel side pressure is hydraulically controlled with a relatively high hydraulic pressure, and a hydraulic pressure control valve with a fail-safe to compensate for insufficient braking when the front wheel side fails. The hydraulic pressure control valve is mounted in a mounting hole provided in a side wall of the master cylinder.

However, as shown in FIG. 5, this hydraulic pressure control valve is provided on the outside of the left end face of the valve casing 60 in order to secure a passage between the communication port 62 at the time of installation into the mounting hole and the inside of the mounting hole. A groove 63 is provided on the outer surface of the casing 64 at the outer end thereof. For this reason, when attaching the annular sealing member 65 (O-ring), it is slid on the outer peripheral surface of the casing 64 and attached at a predetermined position.

[0004]

As described above, when the O-ring is mounted at a predetermined position, the inner periphery of the O-ring may be damaged by the edge of the groove formed at the end of the valve casing. . The scratches on the O-ring may cause poor sealing, and may cause liquid leakage. In addition, when the casing is made of a metal material, since the grooves are cut, the number of steps in manufacturing the casing increases,
There is also a problem that the cost is increased.

[0005] The present invention has been made in view of the above problems, and when an O-ring is mounted on the outer periphery of a valve casing, an O-ring is required.
An object of the present invention is to provide a valve casing that can be mounted without damaging the ring and that can further reduce the number of production steps.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a space inside a movable body and a valve mechanism which is opened and closed in response to the movement of the movable body. A communication port communicating with the space is opened, a groove is provided extending in a direction transverse to the axis of the communication port, and an annular sealing member is mounted on the outer periphery, and at least a portion where the sealing member is mounted. The end face side is inserted into a mounting hole from which, in the valve casing which defines a fluid passage communicating with the space through the communication port and the groove in the mounting hole, the communication port and the groove are This is achieved by a valve casing in which the provided part is formed separately from the remaining part.

[0007]

Since the portion of the valve casing where the communication port and the groove are provided is separate from the remaining portion, there is no need to form a groove extending in the direction transverse to the axis of the communication port in the remaining portion. When the sealing member is mounted on the outer periphery of the valve casing, the inner periphery of the sealing member is not damaged.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A valve casing according to a first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a valve casing according to the present embodiment. The valve casing 1 is housed in a housing 11 formed on a side wall of a main body of a master cylinder 10 partially shown in the drawing. The valve casing 1 includes a first casing 2 and a second casing 3, and the second casing 3 is integrally press-fitted into a hole provided at a left end opening of the first casing 2 having a cylindrical shape. It has been incorporated.

A stepped piston 5 is provided in an inner hole 4 formed by incorporating the casing 2 into the casing 3, and the stepped piston 5 has a left end formed in the second casing 3. 6 is accommodated in the first medium-diameter hole 7 and the first small-diameter hole 8, and the right end is accommodated in the second medium-diameter hole 12 and the second large-diameter hole 13 formed in the first casing 2. The space between the stepped piston 5 and the casings 2 and 3 is sealed by O-rings 17, 18 and 19.

An outlet chamber 20 is defined between the O-ring 18 and the O-ring 19 and communicates with an inlet chamber 24. These chambers 20 and 24 are formed in radial through holes formed in the stepped piston 5. The connection is made through a T-shaped passage 23 comprising a through-hole 21 and an axial through-hole 22.

The inlet chamber 24 is provided in the second casing 3, and a stepped valve body 25 is provided inside the second casing 3 so that the shoulder 15 abuts on a cylindrical holding member 26 by the biasing force of a spring 27. ing. The spring 27 is provided between the shoulder 15 of the valve body 25 and the plate 4.
The valve member 25 is biased against the holding member 26 in a compressed state between the valve member 25 and the holding member 26. As shown in the figure, the diameter of the spring 27 is small at both ends and large at the center. At the center, the spring 27 comes into sliding contact with the inner wall of the holding member 26, and both ends of the spring 27 have stepped valve bodies 25, respectively. Shoulder 15 and plate 4
It is received as 0. Although the valve body 25 divides the inlet chamber 24 into two, the through hole 16 provided in the valve body allows the liquid to flow between them at all times.

The plate member 40 is made of a synthetic resin material, and is fitted into a recess 33 provided at the entrance side opening of the entrance chamber 24 of the stepped hole 6 of the second casing 3. As shown in FIGS. 1 to 3, the plate member 40 is an annular member having a communication port 41 formed at the center, and has a smaller diameter than the second casing 3, and an outer diameter is the same as an inner diameter of the recess 33. The thickness is greater than the depth of the recess 33. A cross-shaped groove 46 is formed on one surface across the axis of the communication port 41. This plate material 40
Is fitted into the recess 33 of the second casing 3, the projection 42 projects from the left end surface of the second casing 3 and comes into contact with the lid member 43. Thereby, the groove 46 becomes a passage, and the communication port 16 communicates the groove 46 with the inlet chamber 24 .

A preload spring 28 is stretched in a compressed state in the inner hole 4 of the first casing 2 which is sealed by the O-ring 17 and the O-ring 18, and one end is provided on the outer wall of the second casing and the other end is provided. Is locked to the flange portion 29 of the stepped piston 5, so that the stepped piston 5 is not operated when the outlet chamber 2 is not operated.
It is always biased to the 0 side. When the stepped piston 5 resists the spring force of the spring 28, it slides in the casings 2 and 3, and the tapered portion formed on the left end thereof is seated on the valve body 25. As a result, the entrance chamber 24 and the passage 23 are shut off.
A guide member 30 for guiding the stepped piston 5 is fitted to the right end of the first casing 2.

An annular groove 35 is formed on the outer periphery of the first casing 2.
An annular groove 34 is also formed on the outer peripheral portion of the second casing 3. Each of these annular grooves 34, 35, 36 has an annular O-ring 37, 38, 3
9 is mounted. The outer diameter of the plate member 40 is smaller than the outer diameter of the second casing 3, that is, the O-ring 37 can be mounted without contacting the outer peripheral portion of the plate member 40 when the O-ring 37 is mounted. It is made so that the inner circumference is not scratched when worn.

As described above, the valve casing 1 according to the present embodiment is held in the housing 11 by the lid member 43 as shown in FIG. A first passage 44 to which the pressure liquid from the master cylinder is supplied is provided at a boundary between the lid member 43 and the plate member 40, and a groove 46 which is a passage formed by the wall of the lid member 43 is It is connected to the first passage 44. During the braking operation, the hydraulic pressure supplied from the master cylinder 10 is applied to the first passage 44, the groove 46, and the communication port 41.
To the inlet chamber 24 . Further, a second passage 45 connected to the radial through hole 21 formed in the outlet chamber 20 is provided.
Is in contact with the rear wheel brake system. On the other hand, hydraulic pressure is supplied to the front wheel side brake device from a control chamber 9 provided on the right end side of the stepped piston 5 separately.

The configuration of the valve casing 1 according to the first embodiment of the present invention has been described above. Next, the operation thereof will be described.

The hydraulic pressure from the master cylinder 10 side is supplied to the first passage 44 by the brake operation, and is further shown through the groove 46, the communication port 41, the inlet chamber 24 , the T-shaped passage 23 and the second passage 45. Not contact rear brake system. On the other hand, is supplied with the even fluid pressure in the control chamber 9 side, the hydraulic pressure is supplied to the front-wheel brake device (not shown), the force F ₂ for pressing the right end portion of the stepped piston 5 acts.
When a predetermined pressure is reached in the valve casing 1, the stepped piston 5 causes the O-rings 17 and 18 to seal the portion D _1.
Force F ₁ obtained by multiplying the difference area of D ₂ by the liquid pressure in the inlet chamber 24 .
Pushes the stepped piston 5 to the left. When the sum F of these forces becomes larger than the spring force of the spring 28, the stepped piston 5 moves to the left, sits on the valve seat of the valve body 25, and the hydraulic pressure from the inlet chamber 24 to the outlet chamber 20 increases. Is stopped, and the hydraulic control of the rear wheel brake device is started. At this time, the valve 2
Although abnormal noise may be generated by the vibration of the
Since the central portion of the slidably contacts the inner wall of the holding member 26, the frictional force eliminates vibration and prevents generation of abnormal noise.

The valve casing 1 acting as described above
Is assembled into the housing 11 of the master cylinder 10 after the O-ring 37 is mounted and assembled into a cartridge in advance during assembly. In the valve casing 1, as a passage for the supply port of the hydraulic pressure from the master cylinder 10, there is no need to cut a groove having a sharp corner, which is conventionally formed around the left end surface of the second casing 3. . A plate 40 having an alternate groove 46 is provided.
Is made of a synthetic resin material, and is processed by the second casing 3
Is made of a metal material and the groove can be easily formed and the labor of the operation can be reduced as compared with the case where the groove is cut.

The outer diameter of the plate member 40 in which the groove 46 serving as a passage for the hydraulic pressure is formed is smaller than the outer diameter of the second casing 3. With this configuration, when the O-ring 37 is mounted on the valve casing 1, the inner periphery of the O-ring 37 does not touch the corners of the protrusion 42 formed on the plate 40, and the second casing 3 Can be easily and smoothly slid over the outer periphery of the camera. As a result, the O-ring is not damaged, and the occurrence of poor sealing can be prevented. In this embodiment,
Particularly, the plate member 40 is attached first, and the O-ring 37 is attached later.
It is effective when installing. When the O-ring 37 is attached to the second casing 3 first and the plate 40 is attached later, the O-ring 37 is not damaged even if the outer diameter of the plate 40 is almost the same as the second casing 3. Will not stick.

Hereinafter, a valve casing according to a second embodiment of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 shows a second casing 5 press-fitted into a hole formed in the first casing 2 as in the first embodiment.
Indicates 0. In the figure, the second casing 50 has a cylindrical shape on the left end side and a convex shape.
It is formed substantially equal to the inner diameter of the ring 37. The cap member 51 is made of a synthetic resin material having a substantially U-shaped cross section, and the tip of the small-diameter portion 56 of the second casing 50 is fitted into the inner periphery of the U-shape. A communication port 52 that communicates with the inlet chamber 24 is opened on a surface of the cap member 51 facing the left end side of the valve body 25. Also, the cap member 5
An annular protrusion 54 having an outer diameter smaller than the outer diameter of the cap member 51 is provided at the left end of the cap 1, and a groove 53 is formed in the radial direction. The communication port 52 is formed by the groove 53 and the entrance chamber.
24 .

The configuration of the valve casing according to the second embodiment of the present invention has been described above.
If the ring 37 is attached to the small-diameter portion 56 of the second casing 50 first and the cap member 51 is fitted later, the O-
The inner circumference of the ring 37 is not damaged. Further, it is not necessary to form an annular groove for mounting an O-ring on the second casing 50 as in the first embodiment. Further, since there is no annular groove, the corner of the O-ring 37 is not scratched by touching the inner periphery thereof.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited to these, and various modifications can be made based on the technical concept of the present invention.

For example, the plate member 4 in the first embodiment described above.
Although the cap member 51 in the first and second embodiments is made of a synthetic resin material, it may be made of metal.

[0026]

As described above, according to the present invention, when the O-ring is mounted on the outer peripheral surface of the valve casing, the inner periphery of the O-ring is not damaged, so that there is a possibility that defective sealing may occur. Disappears. Further, it is not necessary to form a groove for introducing the hydraulic pressure from the master cylinder in the remaining portion, and the number of cutting processes can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a valve casing according to a first embodiment of the present invention is mounted on a master cylinder.

FIG. 2 is a side view showing a state where a plate material is fitted into the valve casing.

FIG. 3 is a perspective view of the same.

FIG. 4 is a front view of a valve casing according to a second embodiment of the present invention.

FIG. 5 is a front view showing a conventional valve casing.

[Explanation of symbols]

Reference Signs List 1 valve casing 5 stepped piston 24 inlet chamber 37 O-ring 40 plate 41 communication port 46 groove 51 cap member 52 communication port 55 groove

Claims (2)

(57) [Scope of request for utility model registration] 1. A cavity for accommodating a movable body and a valve mechanism which is opened and closed in response to the movement of the movable body, and a communication port communicating with the cavity is provided outside an end surface of the movable body. An opening is provided and a groove extending in a direction transverse to the axis of the communication port is provided, and on the outer periphery, an annular sealing member is mounted, and at least the end face side from the portion where the sealing member is mounted into the mounting hole. In the valve casing that is inserted and thereby defines a fluid passage communicating with the cavity through the communication port and the groove in the mounting hole, a portion where the communication port and the groove are provided is referred to as a remaining portion. Is a valve casing formed separately. 2. The valve casing according to claim 1, wherein a portion where the communication port and the groove are provided is made of a synthetic resin material.