KR910003237Y1 - Reserver for master cylinder - Google Patents

Abstract

No content.

Description

Quick Charge Master Cylinder

1 is a side view of a partial cross-sectional view showing a master cylinder of the present invention.

2 is a cross-sectional view showing a valve device used in the master cylinder of the present invention.

3 is a view showing the end of the hollow valve body seen in the direction of arrow "A" of FIG.

4 is a partially cutaway sectional view showing a conventional master cylinder.

* Explanation of symbols for main parts of the drawings

1: cylinder body 2: cylinder hole

3: large diameter portion 4: small diameter portion

5: large diameter piston portion 6: small diameter piston portion

7: piston 8: front end wall

9: hydraulic chamber 10: output port

11, 12: elastic piston cup 13: supply loss

14: return spring 15: stop ring

16: relief pot 17: supply pot

18: oil reservoir 19: through passage

20: connector 21: 0-ring

22: screw 23: valve device

24: hose 25: oil tank

26: stopper 26a: light through hole

26b: protrusion 27: throttling

28: casing 29: check valve

30: pressure response valve 31: bypass

32: valve chamber 33: valve seat

34: hollow valve body 35: valve spring

36: spherical part 37: cylindrical part

38: step portion 39: connecting passage

40: valve seat member 41: valve seat

42: spherical valve body 43: stepped portion

44: valve spring 45: fine groove

a: space on valve seat b: space on cylindrical section

The present invention relates to a quick-charged master cylinder that is capable of rapidly filling a hydraulic chamber in a hydraulic chamber at the time of initial movement of a piston, thereby quickly eliminating idleness of an operating device such as a wheel brake.

As a master cylinder of this type, as described in Japanese Laid-Open Publication No. 57-135459 in Fig. 4, the stepped portion of the cylinder main body 101 has a small diameter portion at the front and a large diameter portion at the rear. To form a cylinder hole 102, which slides a piston having a small diameter piston portion 103 and a large diameter piston portion 104 corresponding to the small diameter portion and the large diameter portion, respectively. A supply oil chamber 107 formed so as to be movable and formed between the relief ports 104 opening in the hydraulic chamber 105 formed in front of the small diameter piston portion 103 at a predetermined retracted position of the piston. The supply port 108 opening in the opening is connected to the oil tank 110 with a through flow path 109 formed in the cylinder body 101 interposed therebetween, and the valve device 111 is connected to the through flow path 109. It is known to form The.

According to this, when the brake is applied, the piston 104 moves rapidly due to the large hydraulic pressure of the large diameter portion of the cylinder body 101, so that the operation of the brake is quick and the clearance until the brake becomes effective (clearance). You can fill this quickly.

In this device, the valve device 111 is required in order to control the flow of oil between the relief port 106, the supply port 108 and the oil tank 110. In the paster cylinder, the valve device is provided in the master cylinder body 101.

However, as described above, in the conventional master cylinder, since the valve device 111 is provided in the master cylinder main body 101, processing of the master cylinder main body 101 becomes complicated, and There was a problem that there are many assembly processes and the manufacturing cost increases.

The present invention is intended to solve the above problems, and the object of the present invention is to make the master cylinder main body a simpler configuration, to facilitate processing, and to reduce the number of assembling processes, thereby reducing the manufacturing cost. It is to provide a quick-filling master cylinder capable of, characterized in that the cylinder body is formed with a stepped cylinder hole of the front small diameter portion and the rear large diameter portion, the small diameter portion and A relief port that slides a piston having a small diameter piston portion and a large diameter piston portion respectively corresponding to the large diameter portion, the opening being opened in a hydraulic chamber formed in front of the small piston portion at a predetermined retreat position of the piston; The inlet is opened to the supply oil chamber formed between the small diameter piston portion and the large diameter piston portion In a master cylinder in which a supply port is formed, the relief port and the supply port are connected to an oil tank attached to the vehicle body via a hose, and a valve device is placed in an intermediate portion of the hose. And the valve device includes a pressure actuating valve that opens when the pressure of the oil supply chamber rises above a predetermined value, and a check valve that allows oil to flow in only one direction from the oil tank to the oil supply chamber. It is in

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side view of a partial cross section showing a master cylinder of the present invention, in which (1) shows a cylinder body, and the cylinder bore 2 of the cylinder body 1 has a large diameter part 3 and a small one. It has the diameter part 4, The large diameter part 3 and the small diameter part 4 have the large diameter piston part 5 and the small part corresponding to the large diameter part 3 and the small diameter part 4, respectively. The piston 7 in which the diameter piston portion 6 is formed in series is slid, and the hydraulic chamber 9 is provided between the small diameter piston portion 6 and the front end wall 8 of the cylinder hole 2. The compartment is formed, and the brake hydraulic circuit is connected to the output port 10 of the hydraulic chamber 9.

In addition, elastic piston cups 11 and 12 are formed in each of the piston portions 5 and 6, and ring-shaped grooves are formed between the two piston portions 5 and 5, respectively. This groove divides the replenishment oil chamber 13 in the cylinder hole 2.

In addition, the hydraulic chamber 9 is accommodated in the return spring 14 for applying a force to the piston 7 in the retraction direction, and at the same time the force of the return spring 14 is applied to the end of the cylinder bore 2. The end portion of the large diameter piston portion 5 is brought into contact with the engaging ring 15 to be caught, thereby being a predetermined retreat limit of the piston 7.

The cylinder body 1 is provided with an oil reservoir 18 for connecting the relief pot 16 and the supply pot 17 to each other when the piston 7 is located at a predetermined retraction limit. It is.

In the cylinder body 1, a connector 20 formed with a through flow passage 19 connected to and connected to the oil storage chamber 18 is fixed with a screw 22 with a 0-ring 21 therebetween.

The opening end of the through passage 19 of the connector 20 is formed of a flexible material such as rubber and is fixed to the vehicle body with the hose 24 on which the valve device 23 described later is formed. It is connected to and communicated with the tank 25.

As shown in Figs. 2 and 3, the valve device 23 described above is fitted into the hose 24, and the through hole 26a is formed in the center at the rear end in the shape of a disk, and at the front, A cylindrical casing 28 having a stopper 26 formed with a protruding portion 26b protruding therefrom, and having a throttling 27 in the central axis direction at its front end; A check valve 29 that permits the flow of oil only in one direction from the tank 25 to the oil reservoir 18, and formed in the check valve 29 so that the pressure of the supply oil chamber 13 is greater than or equal to a predetermined value. Bypass 31 having a large flow path resistance that bypasses the pressure actuating valve 30 and the two valves 29 and 30, which are opened at the time of rise, to connect between the oil reservoir 18 and the oil tank 25 to pass through. ).

The check valve 29 includes a valve sheet 33 formed at the end face of the throttling 27 positioned inside the valve chamber 32 in the casing 28, and a hollow valve body facing the valve sheet 33 ( 34 and the valve spring 35 that applies the hollow valve body 34 to the valve seat 33.

The hollow valve body 34 is located on the valve seat 33 side, and is fitted to the spherical portion 36 fitted to freely rotate and slide in the valve chamber 32 and the spherical portion 36 connected to the spherical portion 36. The cylindrical portion 37 is smaller than the upper portion 36.

A stepped portion 38 is formed on the lower end face of the cylindrical portion 37, and the valve spring 35 is formed between the stepped portion 38 and the stopper 26 with a tightening force. The spherical portion 36 of the check valve 29 is placed on the valve seat 33 by the elastic force of the valve spring 35 so that the oil tank 25 and the oil reservoir 18 of the cylinder body 1 are separated. Blocking

The spherical part 36 connects the valve seat side space a in the valve chamber 32, and the cylindrical side space b of the hollow valve body 34 to connect and let it pass, and cuts the connection path 39 of four places. ) Is formed, and when the spherical portion 36 is separated from the valve seat 33, the oil above the valve chamber 32 in the hose 24 passes through the respective connecting passages 39 to form a space toward the cylindrical portion 37. It is supposed to flow into (b).

The valve seat member 40 which has a protrusion is attached to the lower part of the cylindrical part 37, ie, the open inlet of the stopper 26 side.

The pressure actuation valve 30 of the valve device 23 includes a valve sheet 41 formed on the inner end surface of the valve seat member 40, a spherical valve body 42 facing the valve sheet 41, and a valve seat 41. And a valve spring 44 formed between the spherical valve body 42 and the stepped portion 43 in the spherical portion 36 to apply the spherical valve body 42 to the valve seat 41. Usually, the spherical valve element 42 is positioned in the valve seat 41 by the elastic force of the valve spring 44 to shut off the oil storage chamber 18 and the oil tank 25 of the cylinder body 1. Doing.

The bypass 31 has a cylindrical space 37 side b of the valve chamber 32, each of the connecting passages 39, a valve seat space a of the valve chamber 32, and a spherical portion ( 36 is formed of a fine groove 45 formed in the front end surface, the fine groove 45 is always connected to the oil tank 25 side and the valve seat side space (a) of the valve chamber 32 through have.

Referring to the operation and effects of the present invention as described above are as follows.

First, when the piston 7 is advanced from the retracted position shown in FIG. 1 by operating the brake pedal, the piston 7 advances while compressing the return spring 14, and the piston cups 11, 12 are Since the relief port 16 is blocked, hydraulic pressure is generated in the hydraulic chamber 9 according to the advance amount of the piston 7, and the hydraulic pressure can be output to the output port 10 to operate the wheel brake. .

At this time, in particular, by advancing the large diameter piston portion 5 of the piston 7, the volume of the oil supply chamber 13 is reduced, so that the oil discharged from the oil supply chamber 13 is discharged from the fine grooves 45. The large flow path resistance and the spherical portion 36 in the check valve 29 are located on the valve seat 33 as a spherical surface, and the oil is hardly returned to the oil tank 25 due to reliable sealing. It is pumped into the hydraulic chamber 9 through the oat 17, the oil reservoir 18, and the relief port 16.

In this way, the hydraulic chamber 9 is rapidly charged with hydraulic pressure. As a result, the output hydraulic pressure is generated early in the output port 10, and the idleness of the wheel brakes is quickly removed, and the operation is performed without time delay. It can be done.

At this time, when the hydraulic pressure of the supply oil chamber 13 rises more than the prescribed | regulated valve opening pressure of the pressure-reacting valve 30 by the pressure-up of the hydraulic chamber 9, the spherical valve body 42 of the valve spring 44 The oil discharged from the supply port 17 of the supply oil chamber 13 of the cylinder main body 1 is moved under pressure because the pressure reaction valve 30 is opened in the second state upward in response to the force. It is returned from the valve 30 to the oil tank 25 through the hose 24, and since the excessive pressure rise of the supply oil chamber 13 of the cylinder main body 1 is suppressed, the advancement of the piston 7 is prevented. There is no giving.

When the operating force is released from the brake pedal, the piston 7 is returned to the predetermined retreat by the restoring force of the return spring 14 in the cylinder body 1, and the hydraulic chamber 9 and the supply oil chamber in the restoration process. (13) is depressurized.

As a result, the oil in the oil storage chamber 18 is supplied to the hydraulic chamber 9 through the relief port 16 and also to the supply oil chamber 13 through the supply port 17.

With this, the oil in the oil tank 25 moves the hollow valve body 34 downward in FIG. 2 against the force of the valve spring 35 so that the check valve 29 is opened. Oil flows into the space b of the cylindrical part 37 of the valve chamber 32 efficiently through the hose 24.

In this case, since the spherical portion 36 in the check valve 29 is in linear contact with the inner circumferential surface of the valve chamber 32, the hollow valve body 34 is smoothly and stably operated.

When the piston 7 returns to the predetermined retracted position, since the relief pot 16 is located through the hydraulic chamber 9, the excess supply of the oil in the hydraulic chamber 9 causes oil from the relief pot 16 to be removed. It is discharged into the oil tank 25 through the storage chamber 18 and the hose 24.

At the time of the action of the respective parts, even if the hollow valve body 34 is inclined as shown by the virtual line in FIG. 2, in the check valve 29, the spherical part 36 is spherical so that Since it is settled, the sealing between the spherical part 36 and the valve seat 33 is reliably formed, and the inclination of the hollow valve body 34 has some influence on the operation of the pressure response valve 30. There is no giving, and therefore the operation of the pressure response valve 30 can always be performed smoothly and stably.

In addition, the fine groove 45 of the bypass 31 can be an orifice medium that penetrates the wall of the hollow valve body 34 cylindrical portion 37.

In addition, the present invention is not limited to the single piston master cylinder as described above, it goes without saying that the present invention can also be applied to a tandem master cylinder.

As described above, according to the present invention, since the valve device is formed in the hose separately from the master cylinder body, it is not necessary to form it in the master cylinder body, so that the machining of the master cylinder body becomes simpler. In addition, the number of assembling steps can be reduced, and the manufacturing cost can be reduced.

Claims (1)

The cylinder main body 1 is provided with the stepped cylinder hole 2 which consists of the small diameter part 4 of the front and the large diameter part 3 of the back, In this cylinder hole 2, the said small diameter part 4 ) And the piston 7 having the small diameter piston portion 6 and the large diameter piston portion 5 corresponding to the large diameter portion 3, respectively, and sliding at the predetermined retracted position of the piston 7. Replenishment formed in the relief port 16 which opens inlet to the hydraulic chamber 9 formed in front of the small diameter piston part 6, and the said small diameter piston part 6 and the large diameter piston part 5 yarn. In the master cylinder is formed with a supply port 17 is opened in the oil chamber 13, the oil is attached to the vehicle body through the hose 24, the relief port 16 and the supply port 17 It connects to the tank 25, and it connects, The valve apparatus 23 is put in the middle part of the said hose 24, and it mounts, The said valve The apparatus 23 flows oil only in one direction from the oil tank 25 to the supply oil chamber 13 and the pressure flow valve 30 opened when the pressure in the oil supply chamber 13 rises above a predetermined value. A quick filling master cylinder characterized in that it is provided with a check valve (29) to allow.