JP6708396B2 - Hydraulic master cylinder - Google Patents

Description

The present invention relates to a hydraulic master cylinder used for motorcycles and motorcycles, and more specifically, a reservoir is disposed above a cylinder body of the hydraulic master cylinder through a fluid passage hole, and a bottom of the reservoir is disposed. The present invention relates to a hydraulic master cylinder provided with a separator on a wall that covers an upper portion of a liquid passage hole.

Conventionally, in a hydraulic master cylinder having a reservoir in the upper part of the cylinder body, the cylinder hole and the reservoir storage chamber communicate with each other through a liquid passage hole, and the working fluid in the reservoir chamber is replenished to the cylinder hole at any time. The hydraulic fluid in the cylinder hole was returned to the liquid storage chamber.

As this reservoir, in order to prevent the bubbles generated in the reservoir from flowing into the cylinder hole, a separator is attached to the bottom wall to integrally cover the upper part of the liquid passage hole and allow only the working fluid to flow into the cylinder hole. There was a problem (see Patent Document 1, for example). Further, in some cases, a protector is arranged above the liquid passage hole to prevent the diaphragm arranged at the upper opening edge of the reservoir from sticking to the liquid passage hole when the hydraulic passage is evacuated when filling the hydraulic fluid. (For example, refer to Patent Document 2).

JP, 2014-24420, A JP, 2013-173418, A

In general, hydraulic master cylinders may or may not require a separator in the reservoir, depending on the type of vehicle to be mounted.For those that do not require a separator, when vacuuming the hydraulic path during hydraulic fluid filling, In order to prevent the diaphragm from sticking to the liquid passage hole, the protector is arranged above the liquid passage hole. For this reason, the hydraulic master cylinder using the separator and the hydraulic master cylinder using the protector are manufactured separately because the shape of the bottom wall of the reservoir is different.

Therefore, the present invention allows the separator to be detachable, and can change the specifications of the hydraulic master cylinder that requires the separator and the specifications of the hydraulic master cylinder that does not require the separator, while ensuring good filling of the hydraulic fluid. The object is to provide a new hydraulic master cylinder.

In order to achieve the above object, in a hydraulic master cylinder of the present invention, a reservoir communicating with the cylinder hole via a liquid passage hole is arranged at an upper portion of a cylinder body having a cylinder hole, and the reservoir is the liquid passage. A reservoir main body having a liquid storage chamber having a through hole opened, and a cap attached to the upper rim of the reservoir main body via a diaphragm are provided around the liquid through hole on the bottom wall of the reservoir main body. A separator that forms a separator mounting portion, covers the upper side of the liquid passage hole inside the separator mounting portion, allows only the working liquid to flow in the cylinder hole, and prevents air bubbles from flowing into the cylinder hole. In a hydraulic master cylinder detachably fitted via a seal member, the separator mounting portion is provided on the bottom wall of the reservoir main body so as to surround the liquid passage hole, and on the upper surface of the separator mounting portion. It is characterized in that a slit that connects the inside and the outside of the separator mounting portion is formed.

Further, the separator has a cylindrical mounting portion and a cover portion that covers an upper surface of the mounting portion, and the separator mounting portion is formed in a cylindrical shape that allows the mounting portion of the separator to be mounted on an inner peripheral side. At the same time, it is preferable to form a plurality of the slits. Further, in the hydraulic master cylinder, the plunger is movably inserted through a pair of cup seals fitted respectively on the cylinder hole bottom side and the cylinder hole opening side of the cylinder hole with respect to the liquid passage hole. It may be a plunger type hydraulic master cylinder, and a piston fitted with a pair of cup seals is movably inserted into the cylinder hole, and the piston is inserted between the pair of cup seals during operation. It may be a side port type hydraulic master cylinder in which a relief port serving as a liquid passage hole and a supply port are arranged.

According to the hydraulic master cylinder of the present invention, when the specifications of the hydraulic master cylinder require a separator, a separator that covers the upper portion of the fluid passage hole is attached to the separator mounting portion, and the separator does not require the hydraulic master cylinder. When using the cylinder specifications, use it with the separator removed from the separator mounting part. With a hydraulic master cylinder with the separator attached to the separator mounting part, even when the diaphragm is in close contact with the bottom wall of the reservoir when the hydraulic path is evacuated when filling the hydraulic fluid, the diaphragm closes the fluid passage hole with the separator. This can be prevented and the working fluid can be filled well. On the other hand, in the hydraulic master cylinder with the separator removed from the separator mounting part, even if the diaphragm is in close contact with the separator mounting part when the hydraulic path is evacuated when filling the hydraulic fluid, it is provided on the upper surface of the separator mounting part. The hydraulic fluid can be circulated through the slit, and the hydraulic fluid can be filled well. As a result, one hydraulic master cylinder can be applied regardless of the presence or absence of the separator, and the cost can be reduced.

Further, the separator has a cylindrical mounting portion and a cover portion that covers the upper surface of the mounting portion, and the separator mounting portion forms the mounting portion of the separator into a cylindrical shape that can be mounted on the inner peripheral side, and has a plurality of slits. By forming the separator, the separator can be easily attached, and the plurality of slits allows the hydraulic fluid to satisfactorily flow when the hydraulic passage is evacuated when the hydraulic fluid is filled. Furthermore, the above-mentioned reservoir can be favorably applied to the plunger type hydraulic master cylinder and the center port type hydraulic master cylinder.

FIG. 3 is a sectional view taken along line I-I of FIG. 2. It is a front view of a hydraulic master cylinder device showing a first embodiment of the present invention. Similarly, it is a front view of a reservoir. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is sectional drawing of the hydraulic master cylinder apparatus which shows the 2nd form example of this invention.

1 to 4 show a first embodiment in which the hydraulic master cylinder of the present invention is applied to a hydraulic master cylinder device for a bar handle vehicle. A hydraulic master cylinder device 1 according to the present embodiment includes a hydraulic master cylinder 3 attached to a handlebar 2 that steers front wheels (not shown) at a front portion of a vehicle body, and an operation lever 4 attached to the hydraulic master cylinder 3. , And the actuator 5 interposed between them.

The cylinder body 3a of the hydraulic master cylinder 3 is fastened to one end of the handlebar 2 using a mounting bolt. A lever holder 3b is projectingly provided on the front side of the body of the cylinder body 3a, and the operating lever 4 is pivotally attached to the lever holder 3b by using a pivot 6 so that the grip operating section 4a extends to the front side of the grip 7 of the vehicle body. It is mounted so that it can be pulled out and rotated.

The cylinder body 3a has a bottomed cylinder hole 3c provided to open to the operation lever 4 side, a reservoir 8 is integrally provided at the upper part, and the liquid storage chamber 8a of the reservoir 8 and the cylinder hole 3c are separated from each other. , Through the liquid passage hole 9. The cylinder hole 3c is formed with cup seal grooves 3d and 3e into which the cup seals 10 and 11 are fitted, on the bottom side and the opening side, and the liquid passage hole 9 is communicated between the cup seal grooves 3d and 3e. A liquid chamber 3f is formed, and a union hole 12 is formed in the bottom. In the cylinder hole 3c, a bottomed cylindrical plunger 13 is inserted so that the bottom portion faces the opening side of the cylinder hole 3c.

The plunger 13 is formed in a bottomed cylindrical shape having a recess 13a that opens toward the bottom of the cylinder hole, and a hydraulic chamber 14 is defined between the recess 13a and the bottom of the cylinder hole 3c. A plurality of small-diameter communication ports 13b are formed on the peripheral wall of the recess 13a in the circumferential direction so as to penetrate the inside and outside of the peripheral wall and communicate the hydraulic chamber 14 and the liquid chamber 3f at the initial position in the non-operating state. A return spring 15 is arranged between the bottom surface of the recess 13a and the bottom surface of the cylinder hole 3c to return the inactive plunger 13 to its initial position. The return spring 15 has an outer surface on the cylinder hole opening side. An abutting portion 13c is formed on which the operating element 5 for pushing the plunger 13 abuts.

The reservoir 8 has a reservoir body 8b having a liquid storage chamber 8a having a liquid passage hole 9 and a cap 18 attached to the upper edge of the reservoir body 8b via a diaphragm 16 and a diaphragm plate 17. The cap 18, the diaphragm plate 17, and the diaphragm 16 are integrally attached to the upper opening edge by three attachment bolts 19. On the outer peripheral portion of the liquid passage hole 9 in the bottom wall 8c of the reservoir body 8b, a separator mounting portion 20 is provided so as to project in a ring shape. The separator mounting portion 20 has an inner periphery into which the separator 21 can be press-fitted, and four slits 20 a communicating with the inner peripheral side and the outer peripheral side of the separator mounting portion 20 are provided on the upper surface at equal intervals in the circumferential direction. ing. Further, a confirmation window 8d for visually recognizing the amount of hydraulic fluid is formed on the side wall of the reservoir 8.

The separator 21 is provided to prevent air bubbles generated in the reservoir 8 from flowing into the cylinder hole 3c and to allow only the working fluid to flow into the cylinder hole 3c. It has a cylindrical mounting portion 21a that is detachably press-fitted through the seal member 22 and surrounds the periphery of the liquid passage hole 9, and a cover portion 21b that covers the upper surface of the mounting portion 21a. Further, the cover portion 21b is formed with a through hole 21c for communicating the liquid through hole 9 with the liquid storage chamber 8a.

When the hydraulic master cylinder 3 thus formed is not in operation, the plunger 13 is disposed at the position shown in FIG. 1 by the elastic force of the return spring 15, and the plunger 13 and the liquid storage chamber 8a of the reservoir 8 are connected to each other. The working fluid can flow between the pressure chamber 14 and the pressure chamber 14 through the communication port 13b, the liquid chamber 3f, and the liquid passage hole 9. When the operator 5 pushes the plunger 13 toward the bottom side of the cylinder hole during operation, the plunger 13 advances the bottom direction of the cylinder hole 3c while compressing the return spring 15, and the communication port 13b moves toward the cup seal on the bottom side of the cylinder hole. After passing 10, the communication between the fluid chamber 3f and the fluid pressure chamber 14 is cut off, and fluid pressure is generated in the fluid pressure chamber 14. The boosted hydraulic fluid is supplied to the brake system via the union hole 12.

In the hydraulic master cylinder device 1 formed as described above, when the hydraulic fluid is filled in the hydraulic passage, the hydraulic fluid is filled while vacuuming the hydraulic passage. At this time, the diaphragm 16 comes into close contact with the bottom wall 8c of the reservoir body 8b, but the diaphragm 16 can prevent the diaphragm 16 from blocking the liquid passage hole 9 and can be filled with the working fluid well.

On the other hand, when the above-mentioned hydraulic master cylinder 3 has a specification of a hydraulic master cylinder device that does not require the separator 21, the separator 21 is removed from the separator mounting portion 20. When the hydraulic passage of this hydraulic master cylinder device is filled with the hydraulic fluid, when the hydraulic passage is evacuated, the diaphragm 16 is in close contact with the bottom wall 8c of the reservoir body 8b, but four diaphragms are provided on the upper surface of the separator mounting portion 20. Since the slits 20a are provided, the hydraulic fluid can be circulated to the inner peripheral side and the outer peripheral side of the separator mounting portion 20 through these slits 20a, and the hydraulic fluid can be well filled. ..

As a result, regardless of the presence or absence of the separator 21, one hydraulic master cylinder 3 can be applied to a hydraulic master cylinder device that requires the separator 21 and a hydraulic master cylinder device that does not require the separator 21. Can be reduced.

FIG. 5 shows a second embodiment of the present invention, and the same components as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

The hydraulic master cylinder device 31 of the present embodiment example includes a hydraulic master cylinder 32, an operation lever 33 attached to the hydraulic master cylinder 32, and a push rod 34 interposed therebetween, The reservoir 8 is integrally provided on the cylinder body 32a of the pressure master cylinder 32.

The cylinder main body 32a of the hydraulic master cylinder 32 of the present embodiment is provided with a bottomed cylinder hole 32b that opens toward the operation lever side, and is a relief that connects the cylinder hole 32b and the liquid storage chamber 8a of the reservoir 8 to each other. A port 35 (liquid passage hole of the present invention) and a supply port 36 (liquid passage hole of the present invention) are provided. A piston 37 is inserted into the cylinder hole 32b via cup seals 38 and 39, and a hydraulic chamber 40 is defined between the piston 37 and the bottom of the cylinder hole 32b. A return spring 41 is contracted between the piston 37 and the bottom of the cylinder hole 32b, and the elastic force of the return spring 41 urges the piston 37 toward the opening side.

The reservoir 8 is attached via a reservoir body 8b having a liquid storage chamber 8a in which a relief port 35 and a supply port 36 are opened, and a diaphragm 16 and a diaphragm plate 17 to the upper edge of the reservoir body 8b. A cap 18 is provided, and the cap 18, the diaphragm plate 17, and the diaphragm 16 are integrally attached to the upper opening edge by three attachment bolts 19. A separator mounting portion 20 is formed in a ring shape on the outer peripheral portion of the relief port 35 and the supply port 36 of the bottom wall 8c of the reservoir body 8b, and the inner peripheral surface of the separator mounting portion 20 is formed on the upper surface of the separator mounting portion 20. A plurality of slits 20a are formed to communicate with the side and the outer peripheral side. Further, the separator 21 is attached to the separator attaching portion 20 via a seal member 22, and integrally covers the relief port 35 and the supply port 36.

When the hydraulic master cylinder device 31 is not operated, the piston 37 is arranged at the position shown in FIG. 5 by the elastic force of the return spring 41, and the liquid storage chamber 8a and the hydraulic chamber 40 of the reservoir 8 are arranged. The working fluid is allowed to flow through the relief port 35. When the push rod 34 pushes the piston 37 toward the bottom side of the cylinder hole during operation, the cup seal 38 on the bottom side of the cylinder hole closes the relief port 35 to generate hydraulic pressure in the hydraulic chamber 40, and the boosted hydraulic fluid is generated. Are supplied to the brake system via the union holes.

Even in the side port type hydraulic master cylinder device 31 of the present embodiment, similarly to the plunger type hydraulic master cylinder 3 of the first embodiment, the specification is not provided with the separator 21, and the hydraulic path is evacuated when the hydraulic fluid is filled. In this case, the working liquid can be circulated to the inner peripheral side and the outer peripheral side of the separator mounting part 20 through the slits 20a of the separator mounting part 20, and the working liquid can be well filled. As a result, one hydraulic master cylinder device 31 can be applied to a hydraulic master cylinder device that requires the separator 21 and a hydraulic master cylinder device that does not require the separator 21, and the cost can be reduced. it can.

The present invention is not limited to the above-described embodiments, but the structure of the hydraulic master cylinder and the structure of the reservoir are arbitrary, and any structure may be used as long as the liquid communication hole communicating with the cylinder hole and the reservoir is covered with the separator. Any other structure can be applied, and a separate reservoir may be provided on the top of the cylinder body. Further, the shapes of the separator mounting portion and the separator are arbitrary.

1... Hydraulic master cylinder device, 2... Bar handle, 3... Hydraulic master cylinder, 3a... Cylinder body, 3b... Lever holder, 3c... Cylinder hole, 3d, 3e... Cup seal groove, 3f... Liquid chamber, 4... Operating lever, 4a... Grip operating part, 5... Operator, 6... Pivot, 7... Grip, 8... Reservoir, 8a... Liquid storage chamber, 8b... Reservoir body, 8c... Bottom wall, 8d... Confirmation window, 9... Liquid Through hole, 10, 11... Cup seal, 12... Union hole, 13... Plunger, 13a... Recessed portion, 13b... Communication port, 13c... Abutting portion, 14... Hydraulic chamber, 15... Return spring, 16... Diaphragm, 17 ... diaphragm plate, 18... cap, 19... mounting bolt, 20... separator mounting portion, 20a... slit, 21... separator, 21a... mounting portion, 21b... covering portion, 21c... through hole, 22... sealing member, 31... liquid Pressure master cylinder device, 32... Liquid pressure master cylinder, 32a... Cylinder body, 32b... Cylinder hole, 33... Operating lever, 34... Push rod, 35... Relief port, 36... Supply port, 37... Piston, 38, 39... Cup seal, 40... hydraulic chamber, 41... return spring

Claims (4)

A reservoir, which communicates with the cylinder hole through a liquid passage hole, is arranged above the cylinder body having the cylinder hole, and the reservoir includes a reservoir body having a liquid storage chamber in which the liquid passage hole is opened, A reservoir main body having a cap that is attached to the upper rim of the reservoir main body through a diaphragm, and a separator mounting portion is formed around the liquid passage hole in the bottom wall of the reservoir main body. A hydraulic master cylinder that covers the upper side of the liquid passage hole and allows a working fluid to flow only into the cylinder hole and prevents air bubbles from flowing into the cylinder hole with a separator detachably fitted through a seal member. At
On the bottom wall of the reservoir body, the separator mounting portion is provided so as to surround the liquid passage hole, and a slit is formed on the upper surface of the separator mounting portion to connect the inside and the outside of the separator mounting portion. Characteristic hydraulic master cylinder. The separator has a cylindrical mounting portion, and a cover portion that covers the upper surface of the mounting portion, the separator mounting portion is formed into a cylindrical shape mounting the mounting portion of the separator on the inner peripheral side, The hydraulic master cylinder according to claim 1, wherein a plurality of the slits are formed. In the hydraulic master cylinder, the plunger is movably inserted through a pair of cup seals fitted respectively to the cylinder hole bottom side and the cylinder hole opening side of the cylinder hole with respect to the liquid passage hole. The hydraulic master cylinder according to claim 1, wherein the hydraulic master cylinder is a plunger type hydraulic master cylinder. In the hydraulic master cylinder, a piston in which a pair of cup seals are fitted is movably inserted in the cylinder hole, and a relief port and a supply port that serve as the liquid passage hole between the pair of cup seals during operation. 3. The hydraulic master cylinder according to claim 1, wherein the hydraulic master cylinder is a side port type hydraulic master cylinder in which and are arranged.

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