JPS6078854A - Quick charging type master cylinder - Google Patents

Abstract

PURPOSE:To keep off the eccentricity and inclination of a valve body and make a seal indallible, by installing a guide part, which guides the valve body slidably in its axial direction, in this valve body allowing fluid circulation toward a reservoir of a pressure control valve, while forming a valve head of the valve body into spherical form. CONSTITUTION:A pressure control valve 23 is installed in a valve chest 20 lying between a passage 19 interconnected to a reservoir and a passage 21 interconnected to a large diametral hydraulic chamber of a master cylinder. The pressure control valve 23 consists of a first valve part 24 and a second valve part 25. The valve part 24 is made up of a plastic-make first valve body 24a, while an interconnecting hole 24c is formed in this valve body 24a. Likewise, a flangelike valve spring receiving part 24d is formed in the lower part of a barrel part 24b of the valve body 24a, and a guide part 24e adjoining a peripheral wall 20e of the valve chest 20 is extendedly installed in an outer circumference of the valve spring receiving part 24d. In addition, a valve head part 24g of the valve body 24a is formed into semispherical form. The eccentricity and inclination of the valve body is prevented at the guide part 24e and if being inclined to some extent, a seal is made sure at the semispherical valve head part 24g. A second valve part 25 is installed in the barrel part 24b of the valve part 24.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a master cylinder of different diameters used in automobiles, etc., and in particular, a pressure horn control valve is provided between a hydraulic chamber and a reservoir of the master cylinder of different diameters. This invention relates to a quick-filling master cylinder.

[Prior Art j] In this type of conventional rapid-filling mask cylinder, a piston of different diameters is slidably inserted into a cylinder hole of different diameters to define a small diameter side hydraulic pressure chamber and a large diameter side hydraulic pressure chamber.

A valve chamber is interposed in a liquid passage communicating between the two hydraulic pressure chambers and the reservoir, and a first valve is formed on the bottom surface of the valve chamber to allow flow toward the reservoir, and a first valve is formed in the bottom surface of the valve chamber to allow flow toward the reservoir. It is known that a bell-shaped pressure control valve consisting of a top hole and an internal spherical valve body is provided with a second valve that allows the flow of water, and is biased toward the reservoir by a spring. However, in the quick-filling mask cylinder configured in this way, the bell-shaped pressure control valve has a first valve that allows flow toward the reservoir formed in a planar shape on the bottom surface of the bell-shaped pressure control valve. Therefore, if an imbalance occurs in the spring that biases the pressure control valve in the direction away from the reservoir and the entire valve is tilted, there is a risk that prompt valve operation and reliable sealing will be prevented.

There were also problems in manufacturing, such as the need for advanced technology to form a ring-shaped high-precision sealing surface on the bottom of the bell-shaped pressure control valve.

[Object of the Invention] The present invention was made in view of the above points, and provides a quick-filling mask cylinder equipped with a pressure control valve that provides accurate valve operation and reliable sealing, and is easy to manufacture. The purpose is to

[Structure of the Invention] In order to achieve the above object, in the present invention, a small diameter head and a large diameter A piston with a different diameter head is fitted in a liquid-tight and movable manner, and a small-diameter side hydraulic pressure chamber is placed in the small-diameter cylinder hole in front of the small-diameter head, and a large-diameter side hydraulic pressure chamber is placed between the rear of the small-diameter head and the front of the large-diameter head. A pressure chamber is defined respectively, a valve chamber is interposed in a liquid passage between the reservoir and both hydraulic pressures, and a first valve body having a valve head is placed in the valve chamber and attached to a valve seat by a valve spring. a first valve part that is brought into pressure contact and allows flow toward the reservoir due to a hydraulic pressure difference; a cylindrical body that is engaged with the first valve body and has a valve seat formed on the top; and a first valve part that is seated on the valve seat within the cylindrical body. In a quick-filling mask cylinder equipped with a pressure control valve consisting of two valve bodies and a second valve part that allows flow in a direction opposite to the reservoir, the pressure horn control valve is arranged in the direction of the axis of the first valve body. A penetrating liquid passage hole, a guide part guided to the inner wall of the valve chamber, a liquid passage part formed by cutting out a part of the periphery of the guide part, the valve spring receiving part, and the periphery of the groove end of the liquid passage hole. and a spherical valve head formed in the valve! It is characterized by being held so that it can be guided spherically within the body.

[Example 2] Next, an example in which the rapid filling type mask cylinder according to the present invention is applied to a tandem type mask cylinder will be described based on the drawings.

The cylinder body 1 has a small-diameter cylinder hole 2 and a large-diameter cylinder hole 3 whose one end is open at the rear thereof. A piston 5 having a different diameter, which is tightly and movably fitted to define a first hydraulic pressure to 6 on the small diameter side and has a small diameter front part 5a and a large diameter rear part 5b, is inserted into the small diameter front part 5.
a into the small cylinder hole 2, a large-diameter occiput 5b into the large-diameter cylinder hole 3, and cup seals 5c, 5c ringed around both heads 5a, 5b, respectively. They are movably fitted to define a small-diameter second hydraulic chamber 7 between the small-diameter piston 4 and the small-diameter front end 5c of the FAa piston 5, and the small-diameter front end 5a of the different-diameter piston 5 and the large-diameter front end 5c. A large-diameter side hydraulic chamber 8 is defined between 5b. Further, a first return spring 9 for biasing the small-diameter piston 4 in the anti-braking direction is installed in the first hydraulic pressure chamber 6 on the small-diameter side, and a second return spring 9 is provided in the second hydraulic pressure chamber 7 on the small-diameter side. A return spring 10 is contracted.

Furthermore, the small diameter side first hydraulic pressure to 6 includes a first discharge port 1 for delivering pressurized liquid to the wheel cylinder (not shown) of the rear wheel.
1, the small-diameter side second hydraulic pressure outlet 7 is provided with a @2 discharge port 12 for delivering pressure fluid to the wheel cylinder (not shown) of the Freon (-wheel).

In addition, a reservoir mounting boss portion 1 is provided on the upper side of the cylinder body 1.
3 are integrally molded, and a reservoir 14 is fitted onto the outside and fixed with a band 15.

The inside of the reservoir mounting boss 13 is defined by a partition wall 13a into a 1'a reservoir chamber 131mB and a 2nd reservoir chamber 13C, and a relief port 16 is provided at the bottom of the first reservoir y13b. A supply port 17 is formed.

The thick ridge portion 18 extending from the reservoir mounting boss portion 13 toward the rear of the cylinder body 1 has a second liquid reservoir portion t of the NJ boss portion 13 from which the reservoir can be taken from the end surface 18a.
3c is formed with a liquid passage 19 that passes through the shell, the open end of which is sealed by a steel ball 18b, a valve chamber 20 is formed in the liquid passage 19, and the bottom of the valve chamber 20 is provided with a valve chamber 20, which will be described later. A spherical valve seat portion 20a corresponding to the hemispherical valve head 24g of the pressure control valve is formed, and a second hydraulic pressure on the small diameter side is provided at the center of the valve seat portion 20a when the different diameter piston 5 retreats and returns. A first liquid passage hole 21 is opened at a position communicating with the chamber 7, and an M2 hole communicating with the large diameter side hydraulic pressure chamber 8 is provided at the upper part of the first liquid passage hole 21.
A liquid passage hole 22 is provided.

Furthermore, a pressure control valve 23 is disposed in the valve chamber 2o formed in the liquid passage 19, and the pressure control valve 23 is composed of a first valve part 24 and a second valve part 25. 24, a communication hole 24c is provided in the axial direction in the body part 24b of the first valve body 24a made of synthetic resin, and a flanged valve spring receiving part 2 is provided in the lower part of the body part 24b.
4d, and a guide portion 24e extending from the outer periphery of the valve spring receiving portion 24d, the tip of which touches the peripheral wall 20e of the valve chamber 20,
A liquid passage portion 24f is formed by cutting out a part of this guide portion 24e, and a valve seat portion 20a is recessed in a spherical shape of the valve chamber 20 around the communication hole 24c on the lower surface of the valve spring receiving portion 24d.
a hemispherical valve head 24g in liquid-tight contact with the body 24;
A second valve, which is a float valve of the second valve part 25 to be described later, is attached to the upper end of the
A plurality of tapered grooves 24 that become liquid passages when the valve body 25d is in close contact with each other.
The valve head 24g is seated on the valve seat 20a, allowing flow toward the reservoir 14.

Further, the second valve part 25 has a metal cylindrical valve case 25c, which has an opening 25a at its spherical top and a flange 25b at its lower part, and connects it to the body 24b of the first valve body 24a.
The valve case 25. The second valve body 25d, which is a spherical float valve, is housed inside the valve C, and the second valve body 25d comes into contact with the opening 25a of the spherical top part.
, this second valve portion 25 allows flow in the opposite direction to the reservoir.
and the first valve part 24 are integrally assembled, and a gasket 26 is attached to a female threaded part 2'O'c formed on the upper opening side of the valve chamber 20.
The end face 2 of the valve holding bolt 26 is screwed into the valve holding bolt 26 in a liquid-tight manner through a.
6b, the valve spring receiving portion 24d of the first valve body 24a, and the flange portion 25b of the valve case 25G.
The valve head 24q of the valve body 24a is disposed so as to liquid-tightly abut against the valve exterior 20a to close the valve, and the reservoir 14. First liquid reservoir space 13b.

Second liquid reservoir chamber 13C2 liquid passage 19. Valve chamber 20. Relief Poe 1-16. The Burai Port 17. First liquid passage hole 21. Second liquid passage hole 22. The first hydraulic pressure chamber 6 on the small diameter side, the second hydraulic pressure chamber 7 on the small diameter side, and the hydraulic pressure chamber 8 on the large diameter side are filled with hydraulic fluid. Note that 25e is an orifice formed in the side wall of the valve case 25c.

Next, the operation of this embodiment configured as described above will be explained.

The cylinder body 1 is installed in the engine room at an angle such that the working fluid level in the reservoir 14 attached to the mounting boss 13 is horizontal at a predetermined position, and the cylinder body 1 is installed in the valve chamber 20 interposed in the fluid passage 19. In the normal state, the hemispherical valve head 24f of the first valve body 24a of the pressure control valve 23 disposed in
When the valve seat 20a formed at the bottom of the valve chamber 20 comes into fluid-tight contact with the valve chamber 20, the opening 25a of the second valve part 25 opens into a spherical float valve which receives the buoyant force of the working fluid. 2 valve body 25d
11 are blocked by.

When the brake pedal or the like is operated for braking, the different diameter piston 5 pushes the different diameter piston 5 and the small diameter piston 4 by the forward movement of the bushing rod (-U shown in the figure), and at the same time pushes the inside of the large diameter side hydraulic pressure chamber 8 into the small diameter piston 4. The pressure is raised to a higher pressure than in the sounding 2 liquid Lf space 7, and the pressure liquid in the large diameter side hydraulic pressure chamber 8 is transferred to the small diameter leading part 5a.
It is supplied to the small diameter side 'A2 hydraulic pressure chamber 7 from the back side of the cup seal 5G through the small hole 5d provided in the hole 5d, and via the second liquid passage hole 22 and the first liquid passage hole 21.

The pressure inside the small-diameter second hydraulic chamber 7, which is supplied with pressurized fluid from the large-diameter hydraulic chamber 8, is rapidly increased, and the pressure fluid is supplied to the wheel cylinder (not shown) of the front wheel through the second discharge port 12. Start.

At this time, the first pressure horn control valve 23 disposed in the valve chamber 20
The valve portion 24 and the second valve portion 25 maintain a closed state.

Also, the different diameter piston 5 moves further forward, and the second piston on the smaller diameter side
The increased hydraulic pressure in the hydraulic pressure chamber 7 is supplied to the wheel cylinder of the front wheel, and the hydraulic pressure in the small-diameter second hydraulic pressure chamber 7 pushes the small-diameter piston 4 in the front, so that the small-diameter piston 4 cup seal 4a is the relief boat 16
After closing the first hydraulic chamber 6 on the small diameter side, 4 pressure is applied to the first hydraulic chamber 6.
141 [Pressure fluid is supplied from the H port 11 to the wheel cylinder (not shown) of the rear wheel, and at d3 at the beginning of braking, the braking gap of the brake is rapidly increased by Jl to shorten the operating time.

Then, when the inside of the small diameter side first hydraulic pressure chamber 6 and the second hydraulic pressure v7 reach a predetermined hydraulic pressure, the flow of pressure liquid from the large diameter side hydraulic pressure chamber 8 to the small diameter side second hydraulic pressure chamber 7 is stopped. Since the pressure in the hydraulic chamber 8 is further increased, the pressure control valve 23 disposed in the valve chamber 20
opens against the valve spring 27, and the valve f! A liquid passage is formed between the portion 20a and the hemispherical valve head 24g, and the pressure liquid sent from the large diameter side hydraulic pressure chamber 8 is discharged to the reservoir 14 side.

Furthermore, when the 6+11 motion operation of the brake pedal etc. reaches its maximum, the delivery of pressure fluid from the large diameter side hydraulic pressure chamber 8 is stopped.
The first valve body 24 of the pressure control valve 23. The hemispherical valve head 249 of a is prevented from eccentricity and inclination by the guide portion 24e, and is seated again on the valve seat portion 20a by the action of the valve spring 27, but at this time, if the action of the valve spring 27 is unbalanced, Even if the pressure control valve 23 is tilted due to this, since the valve head 24 (J) is semispherical, it will come into liquid-tight contact with the valve seat 20a, providing a reliable seal and allowing the valve to close. .

Then, when the brake operation is released, the small-diameter piston 4 and the different-diameter piston 5 start moving backward by the action of the first return spring 9 and the second return spring 10.

At this time, the pressure inside the large-diameter side hydraulic chamber 8 is reduced, and the pressure is lower than that on the reservoir 14 side of the pressure control valve 23, so that the second valve body 25d of the second valve portion 25 of the pressure control valve 23 The valve opens and the opening 25a opens! ! The hydraulic fluid is allowed to flow in the direction opposite to the reservoir through the first fluid passage hole 21 and the second fluid passage hole 22 to supply the hydraulic fluid into the large diameter side hydraulic chamber 8 .

The first liquid passage hole 21 has a small diameter depth 2'a and a pressure 7
After opening inward, the working fluid from the reservoir 14 is sucked in through the first liquid passage hole 21, and the different diameter piston 5 and the small diameter piston 4 each retreat back to their initial positions.

Further, when the second valve part 25 of the pressure control valve 23 is closed and the hydraulic fluid flows in the direction opposite to the reservoir, the second valve part 25 of the second valve part 25 is closed.
The valve body 25d is moved by the flow pressure of the hydraulic fluid to the body 24. of the first valve body 24a. Even if it comes into contact with the upper end of the body part 24b, since the tapered groove 24h is formed in the upper part of the body part 24b, the hydraulic fluid can flow into the hydraulic pressure chambers 7 and 8 via the tapered groove 24h. .

When the small diameter piston 4 and the different diameter piston 5 return to their initial positions, the opening 2 of the second valve portion 25 of the pressure control valve 23 opens.
Hydraulic fluid flows from 5a to the hydraulic pressure v7, 8 side (1 total, the second part 25d of the second part 2!5 rises due to buoyancy, and the opening 25a is closed. The second valve portion 25, which allows flow in the direction opposite to the reservoir 2-01, is closed.

In the above embodiment, the second valve body 25d, which is a spherical float valve, is disposed in the second valve part 25 of the pressure horn control valve 23, but a spherical valve or the like may be used instead of the float valve. It is also possible to press the valve against the valve seat with a spring.

[Effects of the Invention] As described above, the present invention uses a pressure control valve of a fast-filling mask cylinder as a first valve portion that allows flow toward the reservoir, and connects a communication hole that communicates with the axial direction and the surrounding area. a flange-shaped valve spring receiving portion having a guide portion formed thereon; and a valve spring receiving portion connected to the valve spring receiving portion;
and a first valve body having a spherical valve head formed around a liquid passage hole, and an opening for allowing flow in a direction opposite to the reservoir at the top, and a second valve body housed inside. Since the second valve part consisting of a cylindrical valve case is constructed integrally with the first valve, the guide part of the first valve body prevents eccentricity and inclination when the pressure control valve is opened and opened. 9. The pressure control valve is tilted, and the valve head is tilted and comes into contact with the valve seat, so that the spherical valve head provides a reliable seal.

[Brief explanation of the drawing]

FIG. 1 is a sectional front view showing one embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main part of FIG. 1 is the cylinder body, 2 is the small diameter cylinder hole, 3 is the large diameter cylinder hole, 4 is the small diameter piston, 5 is the different diameter piston, 5a is the small diameter front part, 5b is the large diameter rear part, 6 is the first hydraulic bar on the small diameter side , 7 is the second hydraulic pressure on the small diameter side, 8 is the hydraulic pressure chamber on the large diameter side, 11 is the first discharge port, 12 is the second discharge port, 13 is the reservoir intake (=J
Boss part, Zaba from No. 14, 16 is relief boat, 1
7 is the Zabrei port, 19 is the liquid passage, 20 is the valve chamber, 20
a is the valve seat portion, 21 is the first liquid passage hole, 22 is the second liquid passage hole, 2
3 is a pressure control valve, 24 is a first valve part, 24a is a 1' valve body, 24b is a body part, 24c is a communication hole, 24d is a valve spring receiving part, 24e is a guide part, 24f is a liquid passage part, 24g 2 is a hemispherical valve head, 2411 is a tapered groove, 25 is a second valve part, 2
5a is an opening, 25b is a flange, 2.5G is a valve case, 25d is a second valve body, 25e is an orifice, 26
27 is a holding bolt, and 27 is a valve spring. Procedural amendment document 1987 Patent Application No. 187383 2 Name of the invention Rapid filling mask cylinder 3 Relationship with the case by the person making the amendment Patent applicant Nissin Kogyo Co., Ltd. 4 Voluntary submission by agent 6 Increased due to amendment Number 7 of the invention to be amended, detailed description column of the invention in the book II, and Figure 1 of the drawings 8
, Contents of the amendment (1) After "in front" on page 6, line 11 of the specification, insert [, Heads 4a and 4b were formed at both ends], and in line 12 of the same page.
Correct lines r4a and 4aJ to r4G and 4CJ, and insert ``between cylinder bottoms 1a'' next to ``fit and insert'' in line 13 of the same page. (2) "Different diameter piston 5" in lines 10 to 5 on page 14 of the same book was changed to "the tip of the piston 5 of different diameter was inserted into the fitting recess 5d" and "5d" in line 9 of the intervening page. are corrected and overturned to "5e". (3) "4a" on page 14, line 10 of the same book is corrected to "4C1." (4) Figure 1 is corrected as shown in the attached sheet.

Claims (1)

[Claims] 1. A piston with a different diameter having a small diameter head and a large diameter head is fluid-tightly and movably inserted into an irregularly shaped mask cylinder having a small diameter cylinder hole and a large diameter cylinder hole arranged M in series. A small-diameter side hydraulic pressure chamber is defined in the small-diameter cylinder hole at the front of the section, and a large-diameter side hydraulic pressure chamber is defined between the small-diameter head rear and the large-diameter head front, and the fluid passage between the reservoir and both hydraulic pressure chambers is defined. A first valve part having a valve chamber interposed therein, in which a first valve body having a valve head is brought into pressure contact with a valve seat by a valve spring, and fluid pressure difference allows flow toward the reservoir; A cylindrical body that is locked to a valve body and has a valve seat formed on the top, and a second valve body that is seated on the valve seat within the cylindrical body, and a second valve part that warps and allows flow in the direction. In the quick-filling mask cylinder equipped with a pressure control valve, the pressure control valve includes a liquid passage hole penetrating in the axial direction of the first valve body, a guide portion guided to the inner wall of the valve chamber, and a guide portion guided to the inner wall of the valve chamber. A liquid passage portion formed by partially cutting out a peripheral edge of the guide portion, the valve spring receiving portion, and a spherical valve head formed around the opening end of the liquid passage hole, and a spherical valve head formed around the opening end of the liquid passage hole. A rapid filling type mask cylinder characterized by being held so as to be guided by the cylinder.