JPS6216124Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is a brake system that is installed in the reservoir of a vehicle master cylinder to remove air from the brake piping, which consists of brake components filled with hydraulic fluid and piping between them, and to supply hydraulic fluid at the same time. This invention relates to an air venting device for piping.

Conventionally, when removing air from the hydraulic fluid filled in brake components such as master cylinders, pressure control valves, foil cylinders, caliper cylinders, etc. and brake piping, a bleeder attached to each brake component was used. The valve was opened and hydraulic fluid was intermittently pumped from the master cylinder, while the air in the brake piping was exhausted from the bleeder. This work requires synchronizing the depression of the brake pedal with the opening and closing of the bleeders of each device, and therefore requires a high level of skill to completely and efficiently exhaust the air from the entire brake pipe. Moreover, it had the disadvantage of poor workability, such as requiring a large number of workers and a long working time. Furthermore, since the bleeder is opened when the hydraulic fluid is pumped, the hydraulic fluid is discharged together with the air, which not only wastes the hydraulic fluid, but also stains the area around the bleeder mounting part.

The present invention has been developed in view of the above points, and the brake piping air bleed device according to the present invention suctions air mixed in the brake piping by creating negative pressure in the reservoir, thereby achieving a short and efficient method. It is characterized by being able to perform air purge work and also being able to prevent the hydraulic fluid from leaking to the outside.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, in FIG. 1, 1 is a master cylinder, and a pipe 2 is attached to the master cylinder 1, and a brake cylinder such as a wheel cylinder or a caliper cylinder, and a pressure control valve (both not shown) are connected to the pipe 2. ) and the like are connected, and a brake system is formed by the master cylinder 1, piping 2, and each device. A reservoir 3 is attached to the master cylinder 1, and the reservoir 3
The air venting device of the present invention is installed on.

This air venting device is comprised of an attachment part 4 to the reservoir 3 and a switching part 5, and the attachment part 4 is tightly fitted into the reservoir 3.

FIG. 2 shows a longitudinal sectional view of the main body casing 5A of the switching section 5. A valve chamber 6 is provided in the main body casing 5A.
A plunger 7 is slidably provided in the valve chamber 6 to define the valve chamber 6 into an oil chamber 8 and an air chamber 9. The main body casing 5A further includes an oil chamber 8 and an air chamber 9 at mounting portions 4, respectively.
Communication holes 10 and 11 are provided to communicate with each other. Inside the oil chamber 8, the tip end is the main body casing 5A.
A push rod 12 is disposed so as to be able to move forward and backward through the push rod 12 and protrude to the outside.
The other end of the plunger 2 is fitted into a hole 13 provided in the plunger 7. 14 is a hydraulic fluid intake opening into the oil chamber 8, 15 is an oil hole provided in the plunger 7, 16 is an oil hole provided in the push rod, and 17 is an oil hole provided in the plunger 7.
These oil holes 15, 16, 1
7 allows the intake port 14 to communicate with the communication hole 10. 18 is a first valve body fitted into the push rod 12, and when the push rod 12 enters the main body casing 5A, the first valve body 18 is attached to the first valve seat 19 formed on the surface of the plunger 7. the first valve body 1
8 and the first valve seat 19 form a first valve mechanism. 20 is a spring that biases the push rod 12 in the direction of protruding from the main body casing 5A, that is, in the direction of disengaging the first valve body 18 from the first valve seat 19; 21 is a spring seat of the spring 20; It also functions as a stopper to restrict the protruding position of the push rod 12.

On the other hand, a second valve body 22 made entirely of an elastic body is provided in the air chamber 9 to define the air chamber 9 into an atmospheric chamber 23 and a vacuum chamber 24 . Atmospheric chamber 23
communicates with the atmosphere through a dustproof filter 25, and the vacuum chamber 24 communicates with a vacuum source connection port 26. The second valve body 22 is connected to the main body casing 5A.
The communication hole 11 selectively connects the atmospheric chamber 23 and the vacuum chamber 24 by seating on and off the second valve seat 27 provided in the
The second valve body 22 and the second valve seat 27 constitute a second valve mechanism. 28
is a spring that biases the second valve body 22 in the direction of seating on the second valve seat 27; when the second valve body 22 is seated on the second valve seat 27, the second valve body 22
The atmospheric chamber 23 is connected to the communication hole 1 by the hole 29 bored in the hole 29.
It is made to communicate with 1. Reference numeral 30 denotes a spring that urges the plunger 7 in a direction away from the second valve body 22, and when the plunger 7 is pushed to the left in the figure against the spring 30, its tip end is pressed against the second valve body 22. The body 22A of the body 22 is bent, and the second valve body 22 is pushed to the left in the figure to be separated from the second valve seat 27, and the vacuum chamber 2
4 and the communication hole 11 are communicated with each other. Reference numeral 31 denotes a lever, one end of which is rotatably supported by a pin 32 attached to the main body casing 5A, and its intermediate portion abuts the tip of the push rod 12. By rotating the lever 31, the push rod 12 can be advanced into the main body casing 5A to operate the first and second valve mechanisms.
1 constitutes a valve driving member.

The communicating holes 10 and 11 are connected to the mounting portion 4 by pipes 33 and 34, respectively, as shown in FIG. The mounting portion 4 is provided with passages 35 and 36 which are connected to the pipes 33 and 34, respectively, and whose other ends open into the reservoir 3. Thus, the first
The oil chamber 8 is connected to the reservoir 3 through a communication passage, and the air chamber 9 is connected to the reservoir 3 through a second communication passage consisting of a communication hole 11, a pipe 34, and a passage 35. The opening end of the passage 35 into the reservoir 3 is located at a lower position than the opening end of the passage 36 and at the reference liquid level of the reservoir 3. Further, a cut valve 37 is provided in the middle of the passage 35, and by rotating the cut valve 37, the passage 35 is opened. (See Figure 3).

In FIG. 1, reference numeral 38 denotes an oil tank containing hydraulic fluid, and the oil tank 38 is connected to the hydraulic fluid intake port 14. Reference numeral 39 indicates a stand that supports the oil tank 38 at a predetermined height. 40 is a vacuum pump connected to the vacuum source connection port 26; 41
indicate pressure gauges, respectively.

The air venting device for brake piping according to the present invention has the above-mentioned configuration, and as shown in FIG.
and the vacuum pump 40 are respectively connected to the working fluid intake port 14 and the vacuum source connection port 26 of the main body casing 5A of the switching unit 5, the cut valve 37 is opened, and the lever 31 is opened as shown in FIG. .
In this state, the oil tank 38 passes through the oil chamber 8 of the main body casing 5A and communicates with the reservoir 3 via the communication hole 10, piping 33, and passage 35.
The hydraulic fluid in the oil tank 38 flows into the reservoir by gravity and into the brake piping. At this time, in the air chamber 9, the atmospheric chamber 23 and the communication hole 11 communicate with each other, so the air in the reservoir 3 flows through the passage 3.
6, the air is discharged to the atmosphere through the piping 34, the communication hole 11, and the atmospheric chamber 23 in this order. When the liquid level of the hydraulic fluid flowing into the reservoir 3 rises and reaches the opening end of the passage 35, the supply of air flowing back into the oil tank 38 from the opening end is cut off, and the hydraulic fluid reservoir 3 The inflow stops. In this state, air is partially trapped inside the brake cylinder, pressure control valve, etc.

Therefore, when the lever 31 provided on the switching part 5 is grasped and rotated, the push rod 12 enters into the main body casing 5A, the first valve body 18 is seated on the first valve seat 19, and the Communication between the tank 38 and the reservoir 3 is cut off. Furthermore, when the lever 31 is rotated, the push rod 12 slides the plunger 7 in a direction against the spring 30, causing the tip of the push rod 7 to come into contact with the second valve body 22, thereby separating the atmospheric chamber 23 and the reservoir 3. communication is cut off. When the lever 31 is further rotated from this state, the plunger 7 moves the second valve body 22 against the spring 2.
8 and press it to the left against the second valve body 2.
2 is removed from the second valve seat 27, and the vacuum chamber 24 and the communication hole 11 are communicated with each other.

When the lever 31 is held in the above-described state, the reservoir 36 is connected to the vacuum pump 40 and becomes a vacuum state. Therefore, the air trapped and accumulated in the brake pipe expands and floats up into the reservoir 3 through the pipe 2 and the master cylinder 1. The air that has surfaced in this way is transferred to the passage 36, the piping 34, the communication hole 11, and the vacuum chamber 2.
4 to the outside air from the vacuum pump 40. When the air in the brake pipe is sufficiently discharged in this way, the inside of the reservoir 3 becomes in a constant negative pressure state. After confirming this with the pressure gauge 41, when the lever 31 is returned to the open state, the springs 28, 30, 2
0, the second valve body 22 is connected to the second valve seat 2.
7, the plunger 7 separates from the second valve body 22, and the first valve body 18 provided on the push rod 12 separates from the first valve seat 19. For this reason,
The atmospheric chamber 23 and the reservoir 3 communicate with each other, and the reservoir 3
Since the inside becomes an atmospheric chamber, the level of the hydraulic fluid is lowered by the volume corresponding to the air inside the brake pipe 2 discharged by the vacuum pump 40. When the level of the hydraulic fluid decreases in this way, the open end of the passage 35 moves away from the liquid level, so the hydraulic fluid flows into the reservoir 3 again, and the liquid level rises until it is in contact with the open end of the passage 35. The work will be completed when the time comes. Then, the cut valve 37 is rotated to the position shown in FIG. 3 to close the passage 35 and remove the attachment part 4 from the reservoir 3.

The above-mentioned air bleed device according to the present invention is used to remove air mixed in the hydraulic fluid in the brake components and piping when the brake components and piping are replaced during regular vehicle inspections or vehicle inspections. It is also suitable for filling hydraulic fluid into brake piping after it has been assembled on a vehicle production line.

In the above embodiment, the switching part 5 and the mounting part 4 were provided separately and connected to the pipes 33 and 34, but the pipes 33 and 34 were omitted and the switching part 5 and the mounting part 4 were provided separately. and may be provided in series. Furthermore, although a lever 31 is provided as a means for pushing the push rod 12, the lever 31 may be replaced with other means, or it may be omitted and the push rod 12 may be pushed directly.

The air venting device for brake piping according to the present invention is as described in detail above, and has the following effects.

Supplying hydraulic fluid and removing air from the brake piping can be performed with an extremely simple operation of simply operating the valve drive mechanism, so the work can be done easily, efficiently, and in a short time without the need for training. It can be carried out.

Since the hydraulic fluid does not leak to the outside during the air purge operation, the working environment can be kept clean and the hydraulic fluid can be saved.

Since there is no need to provide bleeders to brake component devices such as wheel cylinders, caliper cylinders, and pressure control valves, manufacturing costs for these devices can be reduced.

Since the air in the brake piping can be reliably discharged, consideration for air pockets can be reduced when manufacturing brake components.
It also becomes possible to increase the degree of freedom in design.

If the opening end of the hydraulic fluid passage is located at the level of the reference liquid level when the mounting portion is attached to the reservoir, the hydraulic fluid can be automatically supplied in just the right amount.

[Brief explanation of the drawing]

Fig. 1 is an external view, partly in cross section, of a brake piping air bleed device installed in a reservoir, showing an embodiment of the present invention; Fig. 2 is a longitudinal sectional view of the switching section;
3 is an enlarged sectional view showing different operating positions of the cut-off valve of FIG. 1; FIG. 3...Reservoir, 4...Mounting part, 5...Switching part, 6...Valve chamber, 7...Plunger, 8...Oil chamber, 9...Air chamber, 10, 11...Communication hole, 12
... Push rod, 18 ... First valve body, 19
...First valve seat, 22...Second valve body, 23...
atmospheric chamber, 24... vacuum chamber, 27... second valve seat,
31...Lever.

Claims (1)

[Claims for Utility Model Registration] (1) It has an attachment part to the reservoir and a switching part, and a valve chamber is provided in the main casing that constitutes the switching part, and a plunger can be slid inside the valve chamber. a first valve chamber configured to define the valve chamber into an oil chamber and an air chamber, and to connect the oil chamber and the air chamber separately to the inside of the reservoir between the switching section and the mounting section;
A second communication passage is provided, the oil chamber is provided with a first valve mechanism that connects and disconnects the oil chamber from the hydraulic fluid intake port and the first communication passage, and the air chamber is provided with a first valve mechanism that connects and disconnects the oil chamber from the hydraulic fluid intake port and the first communication passage. a second valve mechanism defining the air chamber into a vacuum chamber connected to a vacuum source and an atmospheric chamber communicating with the atmosphere, and selectively communicating the second communication path with the atmospheric chamber or the vacuum chamber; A brake piping air venting device comprising: a valve driving member for driving the first and second valve mechanisms; the valve driving member is provided in the main body casing; (2) the valve driving member is formed of a push rod;
The first valve mechanism is formed of a first valve body provided on the push rod and a first valve seat provided on the plunger, and the second valve mechanism is formed with a second valve seat provided on the casing. The air venting device for brake piping according to claim (1) of the registered utility model, characterized in that it is formed by a second valve body that is seated on and off the second valve seat. (3) When the second valve body is seated on the second valve seat, the atmospheric chamber is communicated with the second communication path, and when the second valve body is unseated from the second valve seat, it communicates with the vacuum chamber. The brake piping air venting device according to claim (2) of the registered utility model, characterized in that the chamber is configured to communicate with the second communication path. (4) The brake piping air bleed according to claim (3), wherein the second valve body is moved away from the second valve seat by sliding of the plunger. Device. (5) The valve driving member normally communicates between the intake port and the first communication path, and communicates the atmospheric chamber with the second communication path, and when the valve driving member is driven, operating a first valve mechanism to cut off communication between the intake port and the first communication path, and then operating a second valve mechanism,
Utility model registration claim (1) characterized in that the vacuum chamber and the second communication path are made to communicate with each other after first cutting off communication between the atmospheric chamber and the second communication path. Brake piping air bleed device described in item ) or item (4). (6) The brake piping air venting device according to claim (1), wherein the opening end of the first communicating path toward the reservoir is located at a reference liquid level in the reservoir.