JPS59118554A - Hydraulic operation device - Google Patents

Abstract

PURPOSE:To certainly prevent the inflow of foams into an hydraulic pressure hose by providing an oil path that connects an output cylinder such as a master cylinder for a brake to a passive cylinder such as a brake cylinder below the pressure generation chamber of the output cylinder. CONSTITUTION:A reservoir tank 26 is connected to a pressure generation chamber 23 that houses a piston 25 through connecting holes 27 and 28 and an output port 22 is provided at the lower part of the pressure generation chamber 23 through a hole 30 that is perpendicular to the sliding direction of the piston 25 and whose both ends are closed. Two partition members 32 and 33 are provided at the lower recess 31 of the reservoir tank 26 so as to concentrically overlap each other thus the inner part of the tank 26 is partitioned into the three chambers. Holes 37 and 39 that mutually connect the upper and lower three chambers together are mutually shifted circumferentially. As a result, foams B generated at the uppermost chamber 26A are difficult to move downward. In addition, the foams B are certainly prevented from flowing from the output port 22 by providing said port 22 below the pressure generation chamber 23.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic operating device, and more particularly to a hydraulic operating device that can prevent air bubbles from flowing into and accumulating in an oil passage that communicates an output cylinder and a passive cylinder.

Figures 1 to 3 show an example of a conventional front wheel brake device for a motorcycle, including a brake lever! 1, the piston 2 shown in FIG. It is led to a caliper (passive cylinder) 7 via a hose 6 extending from the output boat 5, and a braking force is applied to the front wheel 8 by the caliper 7 and brake disc 7'. The mask cylinder 3 is provided with a reservoir tank 9 at the top, and the reservoir tank 9 is communicated with the pressure generating chamber 4 through a hole 10.

Incidentally, in addition to brake oil, air A enters the reservoir tank 9, and when particularly strong vibrations are applied during driving, especially during motocross driving, this air A causes damage to the brakes as shown in Fig. 2. It may be mixed with the oil, and in some cases may become bubbles B and flow into the pressure generating chamber 4.

Therefore, in the case of the brake device provided at the top of the output boat 5 of the mask cylinder 3 and the pressure generation chamber 4, there is a possibility that the air bubbles B flowing into the pressure generation chamber 4 may further move into the hose 6. Furthermore, when the hose 6 bends upward as the front suspension 12 operates, as shown by the broken line in FIG. 1, the air bubbles B flowing into the hose 6 bend as shown in FIG. The present invention was made in view of the above circumstances, and there is a possibility that air bubbles may accumulate in the oil passage that communicates the output cylinder and the passive cylinder. The purpose is to provide a hydraulic operating device without
Its feature is that the oil passage near the output cylinder is located below the pressure generating chamber of the output cylinder.

Hereinafter, the present invention will be explained with reference to the drawings.

Figures 4 to 6 (a) and (b) show a first embodiment according to the present invention, with Figure 4 being a schematic diagram of the main parts, Figure 5 being a detailed diagram of the master cylinder, and Figure 5 being a detailed diagram of the master cylinder. 6(a) and 6(b) are perspective views of partition members that partition the reservoir tank, respectively.

In this embodiment, as is clear from FIG. 4, the output port 22 of the mask cylinder (output cylinder) 21 is provided at the lower part of the pressure generating chamber 23. Therefore, even if the bubble B flows into the pressure generating chamber 23, the bubble B
is accumulated on the upper inner surface of the pressure generating chamber 23 due to buoyancy, and therefore does not flow into the hose 24 through the output port 22, and of course does not accumulate within the hose 24.

The structure of the mask cylinder 21 will be explained in detail with reference to FIG. 5 and FIG. The reservoir tank 29 communicated with is a spring that biases the piston 25 in the withdrawal direction. The lower part of the pressure generating chamber 23 is communicated with the output port 22 through a hole 30 that is perpendicular to the sliding direction of the piston 25 and closed at both ends.

In addition, two partition members 32 and 33 are arranged concentrically and overlappingly in the lower recess 31 of the reservoir tank 26, so that the interior of the reservoir tank 26 is divided into three upper and lower chambers, and a chamber 26A. , 26B, and 26C, respectively. The upper partition member 32 has a sixth
As shown in Figure (a), it consists of an upper plate 34 that is curved into a bowl shape so as to be convex upward, and a cylindrical leg part 35 provided at the lower part of the upper plate 34. Holes 36 and 37 are formed at the height of the part and at intervals on the periphery, respectively, and these holes 36 and 37 allow the
6B are in communication with each other. In addition, the lower partition member 3
3 is curved into a bowl shape so as to have a convex shape on the upper side, as shown in Fig. 6(b), and has a hole 38 at a high point in the center, and holes 38 at intervals on the periphery. Holes 39 are drilled through the holes 38 and 39, respectively, and these holes 38 and 39 connect the chambers 26B and 2.
6C are in communication with each other. In addition, these partition members 1
2.33 is installed in the recess 31 such that the holes 37 and 39 are circumferentially offset from each other.

According to the master cylinder 21 having the above-described configuration, the reservoir tank 26 is divided into three upper and lower chambers, and each of the chambers 26A and 26B.

The holes 37 and 39 that communicate with each other are arranged circumferentially offset from each other, thereby allowing the pressure generation chamber 23 to flow from the uppermost chamber 26A.
Since the oil passage leading to the uppermost chamber 26A is bent at several places, the air bubbles B generated in the uppermost chamber 26A move downward and are weighed. Moreover, since each of the partition members 32 and 33 is curved to have an upwardly convex shape and holes 36 and 38 are formed at each apex of each of the partition members 32 and 33, it is assumed that the air bubbles B are
．． Even if they reach the lower side of 33, these bubbles B are collected at the center of the upper inner surface of each chamber 26A126B along the curved inner surface using their buoyancy, and quickly moved upward through the holes 36 and 38. I can do it.

Furthermore, even if the master cylinder is tilted with air bubbles B flowing into the chambers 26B and 26C, the air bubbles B can be transferred to the upper chamber 26A or 26 through the holes 37 and 39 in the peripheral portion.
It can be moved to B. Therefore, the top chamber 26
Bubbles B generated in A are difficult to reach inside the pressure generation chamber 23,
Furthermore, there is no leakage from the output port 22 into the hose 24. FIG. 7 shows a second embodiment of the present invention. In this embodiment, a sub-chamber 41 constituting a part of the oil passage is provided below the pressure generating chamber 23, and this sub-chamber 41 is provided below the pressure generating chamber 23.
An output boat 22 is provided on the side of 1.

FIGS. 8(a) and 8(b) show a third embodiment of the present invention. In this embodiment, a convex portion 52 protruding inward from the sub-chamber 51 provided below the pressure generating chamber 23 is provided at the upper part of the sub-chamber 51, so that the pressure generating chamber 23 and the sub-chamber 51 are
A step 53 is formed between the two.

Therefore, even if the mask cylinder 21 is tilted during repair as shown in No. 81iU(b), the pressure generation chamber 2
3 can be prevented from moving to the hose 24.

FIG. 9 shows a fourth embodiment of the present invention. In this embodiment, the oil passage 62 extending from the auxiliary chamber 61 to the output boat 22 is constituted by a vertical passage 63 extending below the auxiliary chamber 61 and a horizontal passage 64 extending laterally from its lower end.

FIGS. 10(a) and 10(b) show a fifth embodiment of the present invention. In this embodiment, the auxiliary chamber 71 is provided at a position shifted from directly below the pressure generating chamber 23.

FIG. 11 shows a sixth embodiment of the present invention.

In this embodiment, the subchamber 81 is provided in the axial direction of the pressure generation chamber 23, the lower part of the subchamber 81 and the lower part of the pressure generation chamber 23 are communicated with each other by an oil passage 82, and the subchamber 81 is connected to the master chamber 23. It is provided integrally with the cylinder 21.

FIG. 12 shows a seventh embodiment of the present invention.

In this embodiment, an auxiliary chamber 92 communicating with the pressure generation chamber 23 via a communication pipe 91 is provided below the pressure generation chamber 23 and separately from the master cylinder 21 .

@13 Figure shows the eighth embodiment of the present invention.

In this embodiment, the hose 10 near the exit boat 22 is
1 is wound in a loop shape so as to protrude vertically and downward.

FIG. 14 shows a ninth embodiment of the present invention.

In this embodiment, the hose 10 near the exit boat 22 is
2 is spirally wound around the vertical Ise so as to extend downward.

In each of the above embodiments, the present invention is applied to a brake drive mechanism, but it goes without saying that the present invention is not limited to this and can be applied to other hydraulic operating mechanisms. .

As explained above, according to the present invention, since the oil passage near the output cylinder is located below the pressure generation chamber of the output cylinder, the air bubbles in the pressure generation chamber communicate with the passive cylinder. It is difficult for the bubbles to flow into the oil passage, and even if they do, they return to the pressure generation chamber side due to the buoyancy of the bubbles themselves, so they do not accumulate in the oil passage and there is no risk of brake malfunction.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a conventional front wheel brake system. Figure 1 is a schematic diagram of the overall configuration, Figure 2 is a schematic explanatory diagram of the mask cylinder and its surroundings, and Figure 3 shows the air inside the hose. Figures 4 to 6 (→, (b)
1 shows the first embodiment of the present invention; 1. FIG. 4 is a schematic explanatory diagram of the mask cylinder and its surroundings; FIG. 5 is a detailed diagram of the mask cylinder; 7 to 14 are schematic illustrations showing other embodiments of the present invention. 7... Caliper (passive cylinder), 8...
Front wheel, A...Air, B...Bubble, 21.
...Master cylinder (output cylinder), 22...
...Output boat, 23...Pressure generation chamber, 24.1
01.102...Hose, 26...Reservoir tank λ41.51.61.71.81.92...
...Auxiliary room, 53...Step, 62.82...
・Oil passage. Figure 7 Figure 9 Figure 10 Figure 12 Figure 13 Figure 14

Claims (1)

[Claims] an output cylinder with a hole communicating with the reservoir tank;
In a hydraulic operating device in which a part of an oil passage that communicates with a passive cylinder that receives hydraulic pressure from the output cylinder is arranged at a higher location than the output cylinder, the oil passage near the output cylinder is connected to the passive cylinder that receives hydraulic pressure from the output cylinder. A hydraulic operating device characterized by being located below a generation chamber.