JPH0343090Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a hydraulic pressure control valve that is attached to the discharge part of a brake master cylinder. This invention relates to an improvement in a control valve that engages with a piston to release the pressure regulating action of a control valve.

(Prior Art) In general, this type of hydraulic control valve has one end connected to a discharge portion 10 of a master cylinder 10, as shown in FIG.
Connection part 1 attached to a and connecting piping to the other end
2, and one end is formed into a discharge part 10a.
A stepped hole 16 formed in the main body 14 with the other end connected to the connecting portion 12, a pressure regulating piston 18 slidably inserted into the stepped hole 16, and a connecting portion separated by the pressure regulating piston 18. 12 and a valve chamber 22 that communicates with the discharge part 10a.
, a passage 24 formed in the pressure regulating piston 18 to connect the outlet chamber 20 and the valve chamber 22, and a passage 24 arranged in the valve chamber 22 opposite to the opening of the passage 24, with the opening of the passage 24 serving as a valve seat 24a. a seatable valve body 26;
It includes a preload spring 28 that biases the pressure regulating piston 18 in a direction in which the valve body 26 moves away from the valve seat 24a, and a valve spring 30 that biases the valve body 26 toward the valve seat 24a. And in the conventional one,
The valve body 26 has a shaft portion 26a, and the shaft portion 26
a itself is the cylinder hole 10b of the master cylinder 10
It stuck out inside.

In such a hydraulic control valve, the cylinder hole 10
The hydraulic pressure in the pressure chamber or valve chamber 22 in b increases,
When the hydraulic pressure acting on the difference in area between the large and small diameter portions 18a and 18b of the pressure regulating piston 18 overcomes the force of the preload spring 28, the pressure regulating piston 18 moves upward and the valve body 26 is pressed against the valve seat 24a at the upper end. The lower part 26b is seated. Therefore, when the hydraulic pressure is above a predetermined value, the hydraulic pressure of the rear wheel brake device that communicates with the outlet chamber 20 is reduced to the valve chamber 20.
The rate of increase is reduced compared to the hydraulic pressure on the second side (this hydraulic pressure is the same as the front wheel side hydraulic pressure).

However, if the above-described pressure regulating action were to be performed even when a failure occurs in the brake circuit on the front wheel side, the problem of insufficient braking force would arise. Therefore, in the illustrated conventional technology, when the piston 11 in the cylinder hole 10b makes an excessive stroke, the flange portion 11a of the piston 11 protrudes into the cylinder hole 10b at the shaft portion 26a of the valve body 26.
in the direction perpendicular to the axis of the valve body 26, and
6 around its lower part 26c, the valve seat 24a at the upper end of the pressure regulating piston 18
and the valve body 26 cannot be seated. Incidentally, the above is described in Japanese Patent Application Laid-Open No. 60-226347.

(Problem to be solved by the invention) By the way, according to the inventor's study, in the conventional hydraulic control valve shown in FIG. 3, the piston 11
When the flange portion 11a engages with the valve body 26, the movement of the valve body 26 is small, and even if the valve body 26 is tilted, the upper opening of the pressure regulating piston 18 may be blocked in some cases. There is. If this happens, the valve body 26 will be separated from the valve seat 24a around the opening, making it impossible to perform the bypass function. Further, in the case of the conventional example, since the valve body 26 is tilted by pushing the shaft portion 26a of the valve body 26 from the side, the shaft portion 26a of the valve body 26 is tilted.
The positional relationship between the piston 6a and the flange portion 11a of the piston 11 must also be regulated with high precision.

This invention was made in consideration of the above points, and its purpose is to reliably achieve the bypass function in the event of a failure.

(Summary of the invention) In this invention, as shown in FIG. 1 corresponding to the embodiment, one end is connected to the master cylinder 10 from the valve chamber 22.
The bypass member 30 protrudes into the pressure chamber of the master cylinder 10 and can be engaged with the piston 11 of the master cylinder 10, and the other end thereof can be engaged with the valve body 60 in the valve chamber 22 by engagement with the piston 11 of the master cylinder 10. However, the bypass member 30 is engaged with the valve body 60 via a lever mechanism including a plurality of lever members arranged in the circumferential direction of the valve body 60.

According to this, the movement of the bypass member 30 is converted into the movement of the valve body 60 via a lever mechanism including a plurality of lever members, so that the bypass function described above can be ensured.

(Embodiment) FIG. 1 shows an embodiment of this invention, and the main feature of this invention lies in the configuration of parts inside the valve chamber 22. The other components of the hydraulic pressure control valve are the same as those shown in FIG. 3 above. Therefore, the other constituent parts are designated by the same reference numerals as in FIG. 3, and the explanation thereof will be simplified.

The cylinder body of the tandem type master cylinder has a circular boss portion 10a which is a discharge portion. A thread is cut on the inner periphery of the boss portion 10a, and the threaded portion 1
The valve body 14 of the hydraulic pressure control valve 70 is screwed and attached to 0c. As a result, the boss portion 10a, together with the main body 14 and the pressure regulating piston 18, forms a valve chamber 22 therein. This valve chamber 22 is connected to a passage 24 of the pressure regulating piston 18 and an outlet chamber 2 on the one hand.
0 to the connection 12 and on the other hand the inlet hole 1
It communicates with the pressure chamber in the cylinder hole 10b through 0d.

Please pay attention to the parts arranged inside the valve chamber 22.

The bypass member 30 has a cylindrical head portion 32, a cylindrical portion 34 with a larger diameter than the head portion 32, and a ring-shaped flat portion 36 that connects the two cylindrical portions. The head 32 has a hole 32 that penetrates to the upper end.
a, the end surface of which is sloped or rounded. The head 32 itself also has a small diameter portion 32b and a medium diameter portion 32c, and the diameter of the medium diameter portion 32c is equal to the diameter of the inlet hole 10.
It conforms to that of d. Further, a ring-shaped fulcrum member 40 rests on the upper shoulder portion 14a of the main body 14,
It is placed inside the valve chamber 22. A ring-shaped protrusion 40a is formed on the upper end surface of the fulcrum member 40. A support ring 50 has a poppet valve body 6 in its center.
0 is supported. The support ring 50 has a plurality of arms 50a extending radially outward, the arms 50a resting on the protrusion 40a of the fulcrum member 40,
Moreover, the end of each arm 50a fits into a notch 34a provided in the cylindrical portion 34 of the bypass member 30. Each arm 50a of the support ring 50 thereby supports the lower portion of the bypass member 30. The poppet valve body 60 is given a force by a valve spring 62 so as to move toward the valve seat 24a on the pressure regulating piston 18 side.

Now, consider the case where the piston 11 on the master cylinder side has an excessive stroke. In this case, the flange portion 11a of the piston 11 hits the upper surface of the head 32 protruding into the cylinder hole 10b, and pushes the bypass member 30 downward. Then, each arm 50a of the support ring 50 is attached to the fulcrum member 40.
The poppet valve body 60 moves downward using the protrusion 40a as a fulcrum, and the poppet valve body 60 moves upward accordingly. Since the support ring 50 functions as a lever, the poppet valve body 60 can be reliably moved upward, and the poppet valve body 60 can be reliably prevented from seating on the valve seat 24a. In particular, in addition to lever action, the poppet valve body 60 is lifted linearly instead of being tilted like in the conventional valve, so that the poppet valve body 60 and the valve seat 24 are
A sufficient gap can be obtained between the Further, the size of the gap can be easily changed by appropriately setting the lever ratio. Note that a plurality of wedge-shaped protrusions 34b are provided on the outer periphery of the cylindrical portion 34 of the bypass member 30, and these protrusions 34b are caught on the inward portion 14e of the upper end on the main body 14 side, and the bypass member 3
0. It has a function of preventing poppet valve body 60 etc. from popping out. Therefore, those protrusions 34b
This is effective when the hydraulic control valve 70 is attached to the boss portion (discharge portion) 10a on the master cylinder side.

(Comparative Example) FIG. 2 shows a comparative example to further clarify the content of this invention. In this comparative example, a horizontally extending protrusion 5 is provided on one side of the poppet valve body 60'.
2, and a bypass member 3 is provided on the upper surface of the protrusion 52.
The lower end of 0' is applied. The poppet valve body 60' includes a hemispherical portion 60'a that seats on the valve seat 24a, and a leg portion 60' that serves as a fulcrum on the protrusion 52 side.
0'b. Therefore, the bypass member 3
0' is pushed down, the poppet valve body 6
As a result of being pushed by the protrusion 52, 0' is tilted as shown by the chain line using the leg 60'b as a fulcrum. In this case, since the protrusion 52 functions as a lever, the poppet member 60' is tilted more reliably and the bypass function is more reliable than in the conventional example described above.

However, in this comparative example, since the lever fulcrum is at one location, the bypass member 30' and the poppet member 6
When the contact portion with the 0' side protrusion 52 changes,
The driving force for tilting the poppet member 60' becomes unstable, which may impair the reliability of the bypass function.

In this regard, in this invention, the plurality of lever members (arms) 50a arranged in the circumferential direction of the valve body 60 allow the valve body 60 to be moved reliably. When the bypass function is activated, the plurality of arms 50a in the circumferential direction are
Even if the bypass member 30 is tilted or otherwise moves unstable, the valve body 60 can be moved reliably, and the valve body 60 can be lifted almost linearly, so the bypass function can be more reliably maintained. make it a thing.

In addition, in the embodiment described above, since the bypass member 30 is pushed down linearly, the piston 11 in the cylinder hole 10b on the master cylinder side
It also has the advantage that each component can be easily taken out.

Further, in the illustrated embodiment, the bypass member 30
Although the hole 32a of the head 32 is I-shaped, it can also be T-shaped.

(Effects of the invention) According to this invention, the movement of the bypass member 30 is converted into the movement of the valve element 60 via the lever mechanism including the plurality of lever members 50a arranged in the circumferential direction of the valve element 60. The bypass function described above can be ensured. Further, when the bypass member 30 is arranged so as to move orthogonally to the movement of the piston 11 by engagement with the piston 11 as in the embodiment, the positional relationship between the piston 11 and the valve body 60 is changed from that of the conventional example. There is no need for strict regulation compared to

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, FIG. 2 is a sectional view showing a comparative example for comparison, and FIG. 3 is a sectional view showing a conventional example. 10... Master cylinder, 11... Piston,
30, 30'...Bypass member, 50...Support ring, 50a...Arm (lever member), 52...Protrusion,
60, 60'... Valve body (poppet valve body), 70...
Hydraulic pressure control valve.

Claims (1)

[Claims for Utility Model Registration] 1. A body whose one end is attached to the discharge part of the master cylinder and whose other end is formed with a connecting part for connecting piping, and which connects one end to the discharge part and the other end to the connecting part. A stepped hole formed in the main body, a pressure regulating piston slidably inserted into the stepped hole, an outlet chamber separated by the pressure regulating piston and communicating with the connection part, a valve chamber communicating with the discharge part, and an outlet. a passageway formed in the pressure regulating piston to connect the chamber and the valve chamber; a valve body disposed in the valve chamber opposite to the opening of the passageway and seatable with the opening of the passageway as a valve seat;
A hydraulic control valve including a preload spring that biases a pressure regulating piston in a direction in which a valve body moves away from the valve seat, and a valve spring that biases a valve body toward the valve seat, one end of which is connected to a valve chamber. The bypass member projects from the pressure chamber of the master cylinder into the pressure chamber of the master cylinder and can engage with the piston of the master cylinder, and has a bypass member whose other end can engage with the valve body in the valve chamber by engagement with the piston of the master cylinder. The member is engaged with the valve body through a lever mechanism, and this lever mechanism includes a plurality of lever members arranged in the circumferential direction of the valve body, and these lever members are used to engage the valve body with the lever mechanism. A hydraulic control valve that moves almost linearly in the axial direction. 2. The hydraulic control valve according to claim 1, wherein the bypass member is arranged to move orthogonally to the movement of the piston of the master cylinder by engagement with the piston of the master cylinder.