JPS5958240A - Deflating device of hydraulic brake cylinder - Google Patents

Abstract

PURPOSE:To quickly perform an air deflating operation by connecting a pump mechanism for discharging air to the outside to an air escape hole mounted on the wall portion of a cylinder. CONSTITUTION:In case of deflating air contained in oil fed into a cylinder 2, a clip 19 is detached to move a piston 8 to be pulled outward, and a gap 17 on the trailing end side is passed through a groove 21. At this time, the interior of a cylinder 6 gets to negative pressure, so that air bubbles in the cylinder 2 are discharged with oil through an air escape hole 5, the groove 21 and the gap 17 to the base of the cylinder 6. Subsequently, the piston 8 is pushed toward the base of the cylinder 6, so that air bubbles and oil in the cylinder 6 are discharged from a vent hole 9 through a discharge port 16 of a one-way valve 15 to the outside. Thus, air bubbles in the cylinder 2 are gradually discharged with oil to the outside by reciprocating the piston 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air bleed device for a hydraulic brake, and more particularly to a device that can bleed air by operating an air bleed device provided on the cylinder side.

Conventional hydraulic brake air bleed devices connect an air release hole that communicates with the cylinder chamber that is integrated with the caliper to a screw hole in a threaded part with a threaded inner wall, and a screw plug is inserted into the screw hole. They are constructed by screwing together, and by loosening the screw plug, the air relief hole is opened, and the air inside the cylinder is removed together with the oil through the air relief hole (1). In this case, in order to bleed the air, the brake lever or brake pedal is reciprocated, and the oil pressure of the mask cylinder is used to release air bubbles contained in the oil from the air bleed hole side.

However, this structure has the disadvantage that it is difficult for one person to bleed air because it is necessary to repeatedly operate the brake lever or brake pedal. An object of the present invention is to eliminate the above-mentioned drawbacks by constructing an air bleed device from a pump, and will be described in detail below using examples.

1 and 2 are a plan view and a sectional view showing an embodiment of an air bleed device for a hydraulic brake according to the present invention. In each figure, the wall of a cylinder 2 integrally formed with a caliper body 1 is shown. is provided with a hydraulic pressure supply port 3, and hydraulic pressure from a mask cylinder (not shown) is supplied to this hydraulic pressure supply port 3 via an eye bolt 4. An air relief hole 5 is provided in the wall of the cylinder 2, and the tip of the air relief hole 5 is connected to an annular groove 21 formed approximately at the center of the inner wall of the pump cylinder (2) and the cylinder 6. The pump cylinder 6 is provided outside the cylinder 2, and the cylinder 6 has a through hole 9 along the central axis.
A ring-shaped groove 10.11 is provided approximately in the center of the piston 8, and an O-ring 12.13 is inserted into the groove 10, 1.1. Installed screw!・Sealing is performed between the cylinder 8 and the inner wall of the cylinder 6. A constricted portion 4 is provided on the tip side of the piston 8, and a one-way valve 15 is attached to the constricted portion 14 side. One-way valve 1 above
The air discharge port 16 of No. 5 can discharge the air discharged from the through hole 9 side to the outside, but has the function of sealing off external air. Further, the outer diameter of the rear end side of the piston 8 is set small, so that a certain gap 17 is provided between the piston 8 and the inner wall of the cylinder 6.

A groove 18 is provided in the front end side wall of the cylinder 6, and a clip 1 made of a V-shaped wire is housed in the groove 18.
A portion of the piston 9 is fitted into a groove 20 provided on the outer circumference of the piston 18 on the distal end side (3) to prevent the piston 8 from being accidentally removed from the cylinder 6.

In such a configuration, in order to remove air bubbles contained in the oil sent into the cylinder 2, the clip 19 is removed and the piston 8 is reciprocated. That is, first, the piston 8 is moved so as to be pulled out to the outside, and the gap 17 on the rear end side is filled with the groove 21.
Let it pass more. At this time, since the inside of the cylinder 6 becomes negative pressure, the air bubbles inside the cylinder 2 are discharged together with the oil to the bottom side of the cylinder 6 through the air relief hole 5, the groove 21, and the gap 17. Next, when the piston 8 is pressed toward the bottom of the cylinder 6, the air bubbles and oil supplied to the bottom of the cylinder 6 are discharged from the through hole 9 to the outside via the outlet 16 of the one-way valve 15 due to the pressing force of the piston 8. be done. By reciprocating the piston 8 in this way, the cylinder 2
It becomes possible to gradually discharge the air bubbles inside together with the oil to the outside.

In this case, by locating the air release hole 5 facing upward, the air bubbles contained in the oil will move upward.
Air bubbles can be effectively removed through the air release hole 5 (4).

As explained above, the air bleed device for hydraulic brakes according to the present invention is configured with a pump mechanism that pulls air bubbles contained in the oil inside the cylinder to the outside. It is convenient to pull it out externally, saving you the trouble of depressing the brake lever or brake pedal.
Air extraction work can be performed quickly and by a single worker.

In this embodiment, the one-way valve 15 has been described as being provided on the tip side of the piston, but it may be provided on the rear end side or in the middle of the through hole 9. Alternatively, this one-way valve may be provided in the middle of the air release hole 5.

As explained above, according to the air bleed device for hydraulic brakes according to the present invention, a pump mechanism for drawing air out to the outside is connected to the air bleed hole provided in the air cylinder. ``The air bubbles contained in the oil can be forcibly drawn out (5), eliminating the need to operate brake levers and brake pedals like in the past, reducing the burden on the operator.

[Brief explanation of drawings]

FIGS. 1 and 2 are a plan view and a sectional view showing an embodiment of an air bleed device for a hydraulic brake according to the present invention. ■...Caliper body, 2...Cylinder, 3...
Hydraulic supply port, 4... Eye bolt, 5... Air relief hole, 6... Cylinder, 8... Piston, 9... Through hole, 15°°° one-way pulp. Patent Applicant Nissin Kogyo Co., Ltd. Agent Patent Attorney Jun Miyazono - (6) Procedural Amendment 1. Indication of the case, -...＼-7・Knee mill 2・ Title of the invention Hydraulic brake cylinder air bleed device 3, Person making the amendment Relationship to the case Patent applicant 4, Agent 8, Contents of the amendment

Claims (1)

[Claims] An air hydraulic brake characterized in that an air relief hole is formed in the wall of the cylinder provided in the cylinder body, and a pump mechanism is connected to the air relief hole to discharge air from the air relief hole to the outside. Extraction device.