JPS6133356A - Hydraulic master cylinder device for vehicles - Google Patents

Abstract

PURPOSE:To prevent the dust deposited on the bottom of a tank from flowing into a hydraulic system, by installing a hole, interconnecting a master cylinder and a reservoir tank with each other, in a bottom part of the reservoir tank as well as installing an annular barrier part surrounding this interconnecting hole. CONSTITUTION:A barrier part 22 is projectingly installed and locked to the bottom surface of a reservoir tank 2, and this barrier part 22 forms a continued fence wall surrounding a relief support 7 and a supply support 8 annularly. An upper surface of the barrier part 222 has a step 23, and height H2 of a part 22 adjacent to the supply support 8 is relatively high but height H1 of a part 221 adjacent to the relief support 7 is relatively low, while a blowup preventing plate 9 is attached to the part 222 and kept up. With this constitution, a hydraulic fluid is blocked by the barrier part so that a sort of the dust deposited on the tank bottom is prevented from flowing into a braking operation system.

Description

DETAILED DESCRIPTION OF THE INVENTION [1] The present invention is usually mounted on a rod-like handle of a motorcycle or three-wheeled vehicle, and is used to control the play of a brake device.
The present invention relates to a hydraulic master cylinder device for a vehicle used to control hydraulic fluid sent to an operating cylinder of a V-type V lipper or a clutch device. .

For example, the front disc brake on a motorcycle is
It is operated by actuating the piston of the master cylinder installed on the handle via an operating lever and pressurizing the added hydraulic oil to the brake lever. A glue 1f-bat tank for supplying and discharging is integrally attached.

FIG. 1 shows such a conventional master cylinder device, in which a reservoir tank 2 is integrally provided on the negative side of the cylinder body 1. A piston 4 is fitted into a cylinder hole 3 drilled in the cylinder body 1 so as to be able to return 11 times. As the screw 1-4 moves forward, the hydraulic oil in the hydraulic chamber 6 is pressurized and is sent to the hydraulic caliper via the boat 5. The reservoir tank 2 and the cylinder hole 3 communicate with each other through two communication holes lined up in the front and back by screws 1 to 4 in the sliding/j direction. According to the operation of the piston 4, the hydraulic oil in the reservoir tank 2 is supplied to the cylinder hole 3 through the relief port 8, and the hydraulic oil in the cylinder hole 3 is supplied to the reservoir through the relief port 1-7. - Discharged to Batank 2.

At the bottom of the reservoir tank 2, a protrusion ↑ is provided near the 1'' part of the supply port 8, and a blow-up prevention plate 9 is fixed to this protrusion 1.

The blow-up prevention plate extends toward the relief ports 1-7 and covers the relief ports 1-7 in an upwardly spaced manner.

Is this blow-up prevention plate 9 the tank key 1? When removing air from the brake system by removing knob 10 and Gui Also, it is provided to prevent the oil in the reservoir tank 2 from foaming due to the hydraulic oil blown up from the relief port 7 into the reservoir tank 2 during normal operation, causing so-called air entrapment.

Trying to increase λW] In such a hydraulic master cylinder device, debris such as residual chips, dust, or chain components generated during use may accumulate at the bottom of the reservoir tank. Although it is easy, there are relief ports 1 to 7 and supply ports 1 at the bottom.
-8 is open, so these dusts can flow into the communication hole 7.
．． 8 and enters the brake system, causing problems such as galling of the cylinder.

The present invention solves the above-mentioned problems in the hydraulic master cylinder device for vehicles, and therefore, in the present invention, as mentioned above, a blower is installed in the reservoir tank. In a vehicle hydraulic master cylinder device equipped with a lifting prevention plate, two i! cylinders are installed at the bottom of the reservoir tank and communicate with the master cylinder. A continuous annular barrier portion surrounding the H hole and protruding from the bottom is provided, and the height of the barrier portion is set in two stages: a portion that holds the blow-up prevention plate and a portion that defines the effective capacity of the reservoir tank. to form.

In the present invention, as described above, the two communication holes communicating with the cylinder at the bottom of the reservoir tank are surrounded by a continuous annular barrier portion protruding from the bottom. It is possible to prevent accumulated dirt from entering the hydraulic operating system through the communication hole.

J. Since the barrier part is formed in two stages: the part that holds the blow-up prevention plate and the part that defines the effective capacity of the 1f-button tank, the height of the blow-up prevention plate holding part must be adjusted. Relatively high<t, -r, the prevention plate is firmly fixed at an appropriate operating position sufficiently spaced above the communication hole, and the portion defining the effective capacity of the reservoir tank is relatively low to prevent the reservoir tank from being disabled. It is possible to appropriately set the effective residual capacity.

Furthermore, by adjusting the height of the reservoir tank effective capacity defining portion, the effective capacity can be adjusted.

Real-fij (911 FIGS. 2 and 3 show an embodiment of the present invention.

Like the conventional master cylinder device shown in FIG. Screws 1 to 4, output capon [~
5, hydraulic chamber 6, relief port 7, supply port 8,
It includes a blow-up prevention plate 9, a tank cap 10, and a diaphragm 11.

An annular oil passage 12 is formed in the middle part of the piston 4 between it and the cylinder hole 3, and a pair of screw parts 13 and 14 are arranged in front and behind with the annular oil passage 12 in between. (The front piston part 13 is provided with a plurality of oil supply holes 15 that communicate between the front and rear end surfaces of the foil, and the annular oil passage 12 is connected to the reservoir tank through the supply port 8. 2
I am in constant communication with. On the front surface of the front piston portion 13, there is provided a brake imaricup 16 made of an elastic material such as rubber.

A return spring 17 is interposed between the primary cup 16 and the end wall of the hydraulic chamber 6, and the piston 4 is pushed rearward by this spring 17.
The receiver is stopped by a second tl ring 18. 19 is dustproof boots. An operating lever 20 is located at the rear end of the piston 4.
When the operating lever 20 is used to push the levers 1 to 4 forward, the hydraulic oil in the hydraulic chamber 6 is kept in contact with the operating lever 20 until the lever 16 reaches the relief boat 7. It escapes to the reservoir tank 2 through the relief port 7, but the primary cup 1G is the relief port 1 to 7.
After passing through the oil 1i"4':6, the hydraulic fluid in the oil 1i"4':6 is pressurized and sent to the brake kit/repa through the output port 5, and the brake is operated.

When the operating force of the operating lever 20 is released, the piston 4 retreats due to the elastic force of the return spring 17, and the pressure difference generated between the hydraulic chamber 6 and the annular oil passage 12 causes the primary cup 16 to move toward the hydraulic chamber 6 side. The hydraulic oil in the reservoir tank 2 is sucked into the hydraulic chamber 6 through the supply boat 8, the annular oil passage 12, the oil supply hole 15 and the gap, and the operation in the hydraulic chamber 6 is caused by the bending. Make up for the loss of oil.

A tank cap 10 and a diaphragm 11 are integrally attached to the upper surface of the reservoir tank 2 with screws 21. The diaphragm 11 deforms up and down in response to fluctuations in the Ij1 plane, so that the pressure within the reservoir tank 2 is always maintained constant.

A blow-up prevention plate 9 is provided at the bottom of the reservoir tank 2. This blow-up prevention plate 9 is placed above the relief port 7 and separated from the boat 7, and as mentioned above, prevents the splashing of hydraulic oil when air is vented from the brake system and the reservoir that occurs during normal operation. Prevents bubbling inside tank 2.

The blow-up prevention plate 9 is fixed to a barrier portion 22 protruding from the bottom surface of the reservoir tank 2, and the barrier portion 22 is connected to the relief boat 7 and the supply boat as shown in FIG. -8 forms a continuous wall surrounding the area in an annular manner. Therefore, the upper surface of this barrier portion 22 has a step 23, and the portion 22 adjacent to the supply port 8 has a height of 1-
12 is a relatively high part 2 adjacent to the relief boat 7;
The height 1-11 of 21 is relatively low, and the blow-up prevention plate 9 is placed at this relatively high portion 222.
A mounting piece 24 that protrudes downward is provided on the peripheral edge of the blow-up prevention plate 9 on the side of the supply port 1-8, which is pulled and held. The barrier portion 22β is fixed along the inner wall surface. Therefore, the blow-up prevention plate 9 does not obstruct the inflow of hydraulic oil or air from the relief bow 1-7, and prevents the hydraulic oil from scattering.
It can be held at a position away from the relief bowl 1-7 to prevent foaming. Of course, the method of fixing the blow-up prevention plate 9 is not limited to the above-mentioned method. For example, the blow-up prevention plate 9 may be fixed by other methods such as being fixed along the upper surface of the portion 222. The height H2 of the splinter prevention plate holding portion is at least sufficient to hold the splinter prevention plate 9 in a predetermined position.

The part 221 is a part that defines the effective capacity of the reservoir tank 2, and only the hydraulic oil above the height C1 can enter and exit the brake system through the relief boat 7 and the supply port 8, and the height C1 is 1"1. The lower hydraulic oil is blocked by the VP wall portion 22 and cannot enter or exit the brake system, and the remaining amount is discharged as an ineffective remaining amount.The debris in the Lily tank 2 is deposited at the bottom of the tank, and this ineffective remaining amount is This prevents dirt, rust, etc. from entering the brake operating system.

The height 11 of the effective capacity defining portion 221 is determined by the balance between - the above-mentioned ineffectiveness O which takes into account the prevention of intrusion of dust, etc., and the required effective capacity.

FIG. 4 shows the structure of the barrier portion 22 in another embodiment, but in this embodiment, a groove-shaped notch 25 is provided on the upper surface of the effective capacity defining portion 221 (J. In other words, the height H7 that defines the effective capacity is the height from the bottom of the notch 25 to the bottom of the reserve tank 2, as shown in the figure. Depending on the capacity of V or the amount of waste in the reservoir tank, the ratio between the effective capacity and the ineffective remaining capacity of the reservoir tank can be adjusted very easily by machining the above-mentioned notch 25. It is also possible to easily divert the brake master cylinder to large brakes.

HAB') Enemy 1 As mentioned above, in the present invention, a3 has a master cylinder':
A reservoir tank is disposed on one side, and two small through holes (J) are provided that communicate with each other between the master cylinder and the reservoir tank. In a vehicle hydraulic master cylinder device in which a rise prevention IF plate is arranged, a continuous annular barrier portion is provided at the bottom of the reservoir tank surrounding the two communication holes and protruding from the bottom; Since the height of the barrier part is formed at two levels, that is, the part that holds the blow-up part and the part that defines the effective volume of the reservoir tank, the debris accumulated at the bottom of the reservoir tank can pass through the communication hole to the hydraulic pressure. Prevents intrusion into the operating system +l: C too much.

Also, firmly fix the blow-up prevention plate in the proper position, and
It is possible to effectively prevent the actuation d11 from blowing up into the tank from the communication hole 1f1.

Furthermore, it is extremely easy to set and adjust the right effective capacity of the reservoir tank and the ineffective remaining capacity.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional master cylinder for motorcycles Φ, Fig. 2 is a sectional view showing an embodiment of the present invention, and Fig. 3 is a sectional view of a barrier portion of the same embodiment. The plan view and FIG. 4 are a plan view and a side sectional view of the barrier portion in another embodiment. 1... Cylinder body, 2... Reservoir tank, 3...
...Cylinder hole, 4...Piston, 5...Outlet horn 1~. 6... Hydraulic chamber, 7... Relief bow 1-1
8... To Nabulibo-1, 9... Blow-up prevention plate, 1
0...Tank key 1 knot 1.11...Die A7 flam, 12...Annular oil passage, 13...Front screw 1 part,
14... Rear piston part, 15... Oil supply hole, 1G.
・・Primary cup, 17・・Return spring, 18・・Preventive ring, 19・・dust-proof boots, 20・・・
・Operation lever, 21...screw, 22...barrier part,
23...Dan, 24...Tori(d')'r', 2
5... Notched portion.

Claims (1)

[Claims] A reservoir tank is disposed above the master cylinder, two communication holes are provided to communicate the master cylinder and the reservoir tank with each other, and a blow-up prevention plate is disposed at a distance above one of the communication holes. In the hydraulic master cylinder device for a vehicle, a continuous annular barrier portion surrounding the two communication holes and protruding from the bottom portion is provided at the bottom portion of the reservoir tank, and the height of the barrier portion is set equal to the height of the barrier portion. A hydraulic master cylinder device characterized in that it is formed in two stages: a part that holds a lifting prevention plate and a part that defines the effective capacity of a reservoir tank.