JP2002178906A - Motorcycle loaded with brake master cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To slim and save a space for a brake master cylinder and to slim a motorcycle loaded with the brake master cylinder. SOLUTION: A sub-tank 7 for feeding hydraulic fluid for brake positioning at a rear side of a vehicle than a master cylinder body part 6 is integrally mounted on the master cylinder body part 6 of the brake master cylinder 2 loaded on the motorcycle. The brake master cylinder 2 has a shape vertically long in depth and is arranged on an arm 11 supporting a rear wheel laterally outside the vehicle. The sub-tank 7 is arranged such that its long axis is positioned laterally outside the vehicle than that of the master cylinder body part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle on which a master cylinder for braking is mounted, and in particular, a sub-tank for replenishing hydraulic oil for braking is provided integrally with a main body of the master cylinder, and its longitudinal direction is substantially the same. The present invention relates to a motorcycle equipped with a brake master cylinder used in a vertical direction.

[0002]

2. Description of the Related Art Conventionally, a master cylinder for a brake, which is often used as a means for generating hydraulic pressure for a front brake, particularly in a motorcycle, has a master cylinder body for supplying hydraulic oil for a brake. The sub-tank is provided integrally, and is laid out with the long axis direction of the master cylinder main body substantially parallel to the ground (Japanese Utility Model Laid-Open No. 3-2962, Japanese Patent Laid-Open No. 10-23).
6374).

In such a brake master cylinder, a plurality of ports formed in a partition partitioning a sub-tank from a master cylinder main body are formed from a hydraulic oil supply port. Is provided substantially parallel to the long axis of the master cylinder body.

[0004] Considering the supply of hydraulic oil during maintenance, the lid needs to be disposed substantially parallel to the ground, so that the long axis direction of the master cylinder main body must also be disposed substantially parallel to the ground. In such a case, it is difficult to secure a space for arranging and mounting the brake master cylinder in the completed vehicle.

Therefore, in order to avoid such a difficulty in arranging the brake master cylinder and securing a space for mounting the brake master cylinder, the brake master cylinder is laid out with its major axis substantially perpendicular to the ground. The sub-tank for supplying hydraulic oil is provided as a separate part from the master cylinder main body, and the sub-tank and the master cylinder main body are connected to each other by a rubber brake hose (JP-A-63-25828).
No. 5).

[0006] However, it is not so easy to secure a space for mounting a subtank, which is a separate part, and a space for passing a brake hose. In addition, stays and bolts for fixing the sub tank and the brake hose are required, and the number of parts increases.

The invention of the present application solves the above-mentioned problems of the conventional master cylinder for a brake, and in particular, a sub-tank for replenishing hydraulic oil for a brake is provided integrally with the main body of the master cylinder, and the sub-tank is provided vertically. It is an object of the present invention to reduce the size and space of a brake master cylinder used to be vertically elongated and to reduce the size of a motorcycle on which the brake master cylinder is mounted.

[0008]

The present invention relates to a motorcycle equipped with a brake master cylinder which solves the above-mentioned problems, and the invention of claim 1 relates to a master cylinder main body. A motorcycle equipped with a brake master cylinder integrally provided with a brake hydraulic oil replenishment sub-tank located on the vehicle rear side of the master cylinder body, wherein the brake master cylinder is vertically The sub-tank is positioned vertically outside the vehicle body with respect to the long axis of the master cylinder body, and is disposed outside the vehicle body side of the arm supporting the rear wheel. This is a motorcycle equipped with a brake master cylinder arranged so as to operate.

Since the invention of claim 1 is configured as described above, the brake master cylinder in which the sub-tank for replenishing hydraulic oil for brake is integrally provided in the master cylinder main body is entirely vertically oriented. It will be formed in a vertically elongated shape. The sub-tank of the brake master cylinder, which is located outside of the arm supporting the rear wheel on the vehicle body side, is located on the rear side of the vehicle with respect to the master cylinder body, and its major axis is the length of the master cylinder body. Since the sub-tank is disposed so as to be located on the outside of the vehicle body with respect to the shaft, the sub-tank can be arranged on the vehicle body side and outside of the master cylinder body near the rear of the vehicle.

As a result, according to the first aspect of the present invention, the following effects can be obtained. In other words, the brake master cylinder does not become bulky in all directions, and its slimness and space saving can be reduced, the protrusion in the vehicle width direction can be reduced, and the motorcycle equipped with the brake master cylinder can be slim. Be transformed into Moreover,
The sub-tank of the brake master cylinder, which is located outside the arm on the vehicle body side, can be located closer to the rear of the vehicle than the master cylinder body, so that the sub-tank of the arm is supported. Without widening the width in the vehicle width direction, and thus making the motorcycle slimmer, it is possible to configure the arms that support the rear wheels to become wider toward the rear of the vehicle, and to install wide tires. .

According to a second aspect of the present invention, there is provided a brake for a brake, wherein a sub-tank for replenishing hydraulic oil for a brake, which is disposed on the vehicle rear side of the master cylinder main body, is provided integrally with the master cylinder main body. In a motorcycle on which a master cylinder is mounted, the brake master cylinder has a vertically elongated shape and is disposed outside a vehicle body side of an arm supporting a rear wheel. A brake disposed so that the innermost side surface is located on the vehicle body side outer side than the innermost side surface on the vehicle body side of the mounting portion of the brake hose on the master cylinder main body side. Is a motorcycle equipped with a master cylinder.

Since the invention of claim 2 is constructed as described above, the brake master cylinder in which the sub-tank for replenishing hydraulic oil for brake is integrally provided in the master cylinder main body, is entirely vertically oriented. It is formed in a vertically long shape. The sub-tank of the brake master cylinder, which is located outside the vehicle body of the arm that supports the rear wheels, is located on the vehicle rear side of the master cylinder main body, and the innermost side surface of the vehicle body side The sub-tank is located closer to the rear of the vehicle than the master cylinder main body, so that the It becomes possible to arrange outside.

As a result, the second aspect of the invention has the same effect as the first aspect of the invention.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a right outer side view showing a mounting structure in a state where a disc type brake device to which a brake master cylinder according to the present embodiment is applied is mounted on a rear side of a motorcycle. FIG. 2 is a diagram showing the mounting structure of FIG. Left inner side view from the other side,
3 is a partially enlarged sectional view of FIG. 1, FIG. 4 is a partially enlarged view of FIG. 3, and FIG. 5 is a perspective view of an oil separator-integrated diaphragm disposed in a sub tank of the brake master cylinder of FIG. FIG. 7 is a schematic plan view of a portion centered on the brake master cylinder and the swing arm as viewed from the direction A in FIG.

Referring to FIGS. 1 to 3, a disc type brake device 1 to which a brake master cylinder 2 according to the present embodiment is applied includes a brake disc 4 integrally connected to an axle of a rear wheel 3 of a motorcycle. A caliper 5 having a pair of friction pads (not shown) for sandwiching the brake disk 4 from both sides, and a master cylinder main body for generating a hydraulic pressure applied to the pair of friction pads via a piston (not shown) 6, a sub-tank 7 for replenishing hydraulic oil for brakes provided integrally with the master cylinder main body 6, and connecting the caliper 5 and the master cylinder main body 6 to supply hydraulic oil to the master cylinder main body 6. Brake hose 8 leading to caliper 5 from
Link mechanism provided with a brake pedal (not shown) and operatively connected to piston 9 in master cylinder body 6
It consists of 10.

Although not shown in detail, the caliper 5 is firmly attached to the rear end of the swing arm 11 by a bolt.

The master cylinder 2 comprises a master cylinder main body 6 and a sub tank 7, and two stays 12, 13 protruding from the master cylinder main body 6 (see FIG. 3).
Are bolted to the bracket 15 at the positions of two bolt holes formed in the bracket 15 protruding from the pivot plate 14, so that the pivot plate
14 is firmly attached.

As shown in FIG. 1, the pivot plate 14 has a U-shape when viewed from the right side, and is located at the center of the body frame of the motorcycle. In FIG. The upper half portion (not shown) of the right side (front of the vehicle) is directed obliquely upward and connected integrally, and the bent portion of the square is directed leftward (rear of the vehicle) obliquely upward. To form part of the rear frame
Is bolted at a bolt connecting portion 17. The body frame structure is formed substantially symmetrically to the left and right. Reference numeral 18 denotes an upper rear frame, and 19 denotes an exhaust muffler.

The end of the brake hose 8 on the side of the master cylinder main body 6 is provided with an eyeball fitting 20, and as shown in FIG. The mounting seat 33 at the upper end, which is one end of
Is attached to the master cylinder main body 6 by being fastened by a banjo bolt 21. The mounting portion of the brake hose 8 on the master cylinder body 6 side includes an eyeball fitting 20 and a banjo bolt 21.

The mounting seat 33 is provided on the master cylinder body 6.
Is formed in a direction orthogonal to the long axis direction. Featured metal fittings
Oil seals 34 are interposed between the mount 20 and the mounting seat 33 and between the center metal fitting 20 and the head of the banjo bolt 21, respectively.

The axis of the banjo bolt 21 is slightly shifted with respect to the axis of the cylinder chamber 6a in the master cylinder main body 6 in a direction opposite to the direction in which the sub tank 7 is provided integrally with the master cylinder main body 6. ing. By doing so, a space for accommodating the mounting portion of the brake hose 8 is secured, and the fastening work of the banjo bolt 21 becomes easy.

In this manner, the end of the brake hose 8 on the master cylinder main body 6 side is connected to the cylinder chamber 6 a in the master cylinder main body 6 through the internal passage of the eyeball fitting 20 and the internal passage of the banjo bolt 21. In fluid communication with
The mounting angle of the master cylinder main body 6 can be adjusted around the major axis thereof, and the master cylinder main body 6 is mounted on the master cylinder main body 6.

As shown in FIG. 2, the brake hose 8 extends from a connection portion to the master cylinder main body 6 to a bolt connection portion 17 at a lower end portion of the lower rear frame 16 from the outside to the inside. It extends rearward along the upper end surface of 11. The end on the caliper 5 side is connected to the caliper 5.

The brake hose 8 has a swing arm 11
Are fixed by fasteners 22 at a plurality of positions on the upper end surface of the. Therefore, when the swing arm 11 which supports the rear wheel 3 at the rear end and swingably supported at the front end by the pivot plate 14 swings up and down, the brake hose 8 moves to the lower end of the lower rear frame 16. The curved portion of the portion extending from the outside to the inside around the bolt connecting portion 17 of the portion can be deformed, and can follow the vertical swing of the swing arm 11.

Next, a detailed structure of the brake master cylinder 2 will be described. As shown in FIG. 3, when the brake master cylinder 2 is attached to the motorcycle body frame (pivot plate 14), its axis is inclined slightly toward the rear of the vehicle (slightly leftward in FIG. 3). Is mounted on the right side of the vehicle body so as to be substantially in the vertical direction of the vehicle body.

As described above, the brake master cylinder 2 comprises the master cylinder body 6 and the sub-tank 7 for replenishing hydraulic oil for brake, which are integrally formed by casting.

The sub-tank 7 is formed in a vertically long shape, and its long axis direction is parallel to the long axis direction of the master cylinder main body 6 (long axis direction of the cylinder chamber 6a). It is located behind the vehicle. As shown in FIG. 7, the brake master cylinder 2 includes a swing arm 11 for supporting the rear wheel 3.
The sub tank 7 is disposed such that its major axis is located further to the right of the vehicle than the major axis of the master cylinder body 6. The sub-tank 7 has an innermost portion on the left side of the vehicle body, that is, a side surface 7a closest to the swing arm 11, and a center metal fitting 20 on the side of the master cylinder main body 6 which is a mounting portion for the brake hose 8. , So as to be located to the outside of the right side of the vehicle body with respect to the innermost side surface (closest to the swing arm 11) 20a.

The inner surface of the sub-tank 7 has a cylindrical shape, the inner diameter of which is slightly larger than the inner diameter of the cylinder chamber 6a. The hydraulic oil storage chamber 7a is shifted in phase in the axial direction with respect to the cylinder chamber 6a. Are located.

The cylinder chamber 6 of the master cylinder body 6
A piston 9 is slidably fitted in a, and the piston 9 is reciprocated by an operator (driver) of a brake pedal via a link mechanism 10. When braking is required for running the vehicle, the cylinder chamber 6
The hydraulic oil in a is pressurized and sent out to the caliper 5 via the brake hose 8. A universal joint 32 connects the outer end of the piston 9 and the end of the link mechanism 10.

Master cylinder body 6 and sub tank 7
3, a first port 24 and a second port 25 are formed in a lower portion of FIG. The first port 24 has a relatively large diameter, and the second port 25 has a portion with a very small diameter.
The throttle effect of 25 is made larger than that of the first port 24.

On the other hand, the sub-tank 7 has a first opening 26 at a lower portion in the long axis direction, a second opening 27 at an upper end (one end), and the first and second openings 26. , 27 are formed with third openings 35 respectively.

The first opening 26 is formed at a position where the axis of the first port 24 and the axis of the second port 25 pass. Therefore, these ports 24 and 25 can be formed by inserting a tool (not shown) through the first opening 26 and machining the partition wall 23. And
After this machining, the first opening 26 is closed by a blind plug 28.

The upper end (the one end in the longitudinal direction), which is the highest position of the sub-tank 7, extends beyond the head of the banjo bolt 21 forming the top of the mounting portion of the brake hose 8 on the master cylinder body 6 side. It was put out, there,
As described above, the second opening 27 is formed. The second opening 27 is used to replenish the brake hydraulic oil when the remaining amount of the brake hydraulic oil in the sub tank 7 becomes low.

The second opening 27 includes a rubber lid 29 which is always provided with a bag-shaped diaphragm 29a, a resin pressing plate 36 placed on the lid 29, and a metal cap. By 30, it is liquid-tightly closed. These lids 29 and presser plates
The cap 36 and the cap 30 are jointly fastened to the upper end wall of the sub tank 7 in a liquid-tight manner by the bolt screw 31.

The diaphragm 29a is provided in the hydraulic oil storage chamber 7a of the sub tank 7 and has a bag-like shape which can be expanded and contracted, and is formed integrally with the lid 29. And
As is better illustrated in FIG. 5, a strip-shaped bag unit 29a-1, 29a-2, 29a-3 in a natural state is formed in a three-dimensional arrangement at intervals of 120 degrees. The lid 29 corresponds to the bags 29a-1, 29a-2 and 29a-3.
Narrow grooves 29b-1, 29b-2,
It is communicated to the outside through 29b-3.

The lower end of the diaphragm 29a in FIG.
It is fixed to a resin oil separator 38, and its bag-shaped internal space is closed here. The oil separator 38 is separated from the diaphragm 29a and is fixed to the diaphragm 29a by an adhesive or heat welding. However, the oil separator 38 may be formed integrally with the diaphragm 29a.

The oil separator 38 is of a disk shape, and has a diameter substantially equal to the diameter of the hydraulic oil storage chamber 7a of the sub tank 7, and has an outer peripheral surface which is equally spaced in the circumferential direction at equal intervals. A circular small hole passage 38a is formed.

Therefore, even if the brake hydraulic oil located above the oil separator 38 in the hydraulic oil storage chamber 7a sucks air due to the vibrations caused by the running of the vehicle and foams, the hydraulic oil remains in the small hole passage 38a. The bubbles mixed with the hydraulic oil are separated by the plate surface of the oil separator 38 and are blocked, so that they do not enter the cylinder 6a of the master cylinder main body 6.

The expansion and contraction of the diaphragm 29a are performed as follows. Diaphragm 29a single bag 29a-1
, 29a-2 and 29a-3 are narrow grooves 29b-1 and 2 formed in the lid 29.
9b-2 and 29b-3, and further, as shown in FIG. 4, a passage 36a and a cap 30 formed in the inner surface of the holding plate 36.
Is communicated to the outside through a passage 30a formed in the peripheral wall of the horn.

The passage 36a formed in the inner surface of the holding plate 36
Although not shown in detail, the narrow grooves 29b-1, 29b-2, 29
It comprises a circular recess commonly covering b-3 and a narrow groove communicating the circular recess with the passage 30a.

A passage formed in the peripheral wall of the cap 30
Although not shown in detail, 30a is connected to a portion cut off in a U-shaped cross section in the direction of the axis of the cap 30 and a groove bottom of the portion cut off in a U-shaped cross section. And a narrow groove portion 30b formed by shaving off an inner peripheral wall of a predetermined length.

Therefore, when the piston 9 of the master cylinder main body 6 reciprocates in the cylinder 6a and the hydraulic oil moves between the cylinder 6a and the hydraulic oil storage chamber 7a of the sub tank 7, the hydraulic oil storage chamber The diaphragm 29a arranged in the inside 7a is contracted or expanded by the working oil and the filled air in the working oil storage chamber 7a. At this time, the air filled in the inside of the diaphragm 29a is released by the narrow groove 29b-1. , 29b-2, 29b-3, the passage 36a, and the passage 30a, so that the diaphragm 29 is formed by the working oil and the filled air in the working oil storage chamber 7a.
It can respond well to the contraction or expansion of a.

A lid 37 is attached to the third opening 35. The lid 37 has a window so that the remaining amount of the brake hydraulic oil remaining in the sub tank 7 can be checked.

Next, the operation of the disc type brake device 1 will be described. Now, when braking is required while the vehicle is running, when the brake pedal is depressed and the piston 9 moves forward in the cylinder chamber 6a via the rear brake lever 10, the hydraulic oil in the cylinder chamber 6a is pressurized. However, the pressurized hydraulic oil is sent to the caliper 5 via the brake hose 8.

At the same time, some hydraulic oil is supplied to the second port 25
Is pushed back into the hydraulic oil storage chamber 7a of the sub-tank 7 through the hydraulic oil storage chamber 7a.
Is absorbed by the contraction of the diaphragm 29a in the piston 9 and the piston 9
Is also absorbed by flowing into the oil chamber 6b behind the large diameter head.

In this manner, the pressurizing action of the hydraulic oil in the cylinder chamber 6a by the piston 9 is slowed down, and the pair of friction pads in the caliper 5 is exerted by sandwiching the brake disc 4 from both sides. The initial operation of the braking action of the disc-type brake device 1 is made gentle, and the safety of the driver is achieved.

When the piston 9 further advances in the cylinder chamber 6a and closes the second port 25, the piston 9
The pressurizing action of the hydraulic oil in the cylinder chamber 6a is increased to the maximum, and the entire amount of the pressurized hydraulic oil is sent to the caliper 5 via the brake hose 8. In this way,
The braking action of the disc-type brake device 1 is fully exhibited.

Since the present embodiment is configured as described above, the following effects can be further obtained. In the brake master cylinder 2 in which a sub-tank 7 for replenishing hydraulic oil for brake is provided integrally with the master cylinder main body 6, the sub-tank 7 is formed in a vertically long shape, and its long axis direction is the master cylinder main body 6.
Is arranged so as to be substantially parallel to the long axis direction.

As a result, the brake master cylinder 2 in which the sub-tank 7 for replenishing the hydraulic fluid for brake is integrally provided in the master cylinder main body 6 is formed in a vertically long shape as a whole, so that it can be bulky in all directions. Therefore, the structure can be simplified, slimmer, and space-saving can be achieved.

A mounting seat 33 for the brake hose 8 is formed at one end in the long axis direction of the master cylinder main body 6 in a direction orthogonal to the long axis direction of the master cylinder main body 6. In the figure, the mounting portion of the brake hose 8 is fastened, and one end of the sub-tank 7 in the long axis direction is extended beyond the mounting portion of the brake hose 8, and serves as a supply port for hydraulic oil for brake. A second opening 27 is provided.

As a result, the structure of the connecting portion of the brake hose 8 to the master cylinder body 6 is reduced in size and simplified.

At the time of maintenance such as replenishment of hydraulic fluid for brakes, the mounting portions (eyeball fittings 20, banjo bolts 2) of the brake hose 8 on the master cylinder body 6 side are required.
1) does not hinder the workability of this maintenance work.

Further, the inner surface of the sub-tank 7 is formed in a cylindrical shape. In the sub-tank 7, a bag-shaped diaphragm 29a and an oil separator 38 having a plurality of small hole passages 38a are arranged. The inside of the device is configured to be able to expand or contract by communicating with the outside air.

As a result, at the time of the initial operation of the disc-type brake device 1, a part of the brake hydraulic oil is pushed back into the sub tank 7, and the pushed-back hydraulic oil is absorbed by the contraction of the diaphragm 29a. Therefore, the initial operation of the brake device 1 is slowed down, and the safety of the driver can be improved.

Also, while the vehicle is running, the hydraulic oil in the sub-tank 7 sucks air due to vibrations to form bubbles, but bubbles mixed with the hydraulic oil are separated by the oil separator 38 and blocked, so that the master cylinder body 6, the brake device 1 always operates accurately and the reliability of the brake master cylinder 2 can be improved.

Since the oil separator 38 is provided integrally with the diaphragm 29a, the oil separator 38 can be easily installed, and the number of parts can be reduced.

Further, in the motorcycle equipped with the brake master cylinder 2 according to the present embodiment,
The brake master cylinder 2 is disposed on the side of the vehicle body such that the long axis direction of the master cylinder body 6 is substantially in the vertical direction of the vehicle body.

As a result, the brake master cylinder 2
Is disposed on the side of the vehicle body so that the entire vertically long shape extends substantially in the vertical direction of the vehicle body, so that the length of the vehicle body in the front-rear direction can be shortened. , The moment applied to the mounting portion of the master cylinder 2 can be reduced.
Thus, the stays 12, 13 and the like in the mounting portion of the master cylinder 2 can be reduced in weight. Also, the protrusion in the vehicle width direction can be reduced, and the motorcycle can be made slimmer.

In the motorcycle equipped with the brake master cylinder 2 according to the present embodiment, the brake master cylinder 2 is disposed outside the right side of the vehicle body of the swing arm 11 supporting the rear wheel 3, and the sub tank 7
Is disposed such that its long axis is located outside the right side of the vehicle body with respect to the long axis of the master cylinder main body 6. At this time, the innermost side surface 7a on the left side of the vehicle body is the innermost side surface 20 on the left side of the vehicle body of the eyeball fitting 20 constituting the mounting portion of the brake hose 8 on the master cylinder main body 6 side.
It is located to the outside of the right side of the car body than a.

As a result, the entire brake master cylinder 2 in which the sub-tank 7 for supplying hydraulic oil for brake is integrally provided with the master cylinder main body 6 is formed in a vertically elongated shape as a whole. The rear end supports the rear wheel 3 and the front end supports the pivot plate 14.
The sub-tank 7, which is arranged on the right side of the vehicle body of the swing arm 11, which is swingably supported by the swing arm 11, is located on the rear side of the vehicle with respect to the master cylinder main body 6. Since the sub-tank 7 is disposed so as to be located on the right side of the vehicle outside the long axis, the sub-tank 7 can be disposed on the right side of the vehicle body outside the master cylinder main body 6 near the rear of the vehicle.

As a result, the brake master cylinder 2
Is no longer bulky in all directions, the slimness and space saving are reduced, the protrusion in the vehicle width direction can be reduced, and the motorcycle equipped with the brake master cylinder 2 is slimmed. In addition, the sub-tank 7 of the brake master cylinder 2 disposed on the right side of the vehicle body of the swing arm 11 can be disposed on the right side of the vehicle body with respect to the master cylinder body 6 near the rear of the vehicle. Without increasing the pivot width (the width of the portion where the left and right pivot plates 14 are disposed in the vehicle width direction), and thus making the motorcycle slimmer, the swing arm 11 is configured to be wider toward the rear of the vehicle. Thus, it becomes possible to mount wide tires.

In this embodiment, the oil separator
The 38 is provided integrally with the diaphragm 29a, but is not necessarily limited thereto, and may be provided separately from the diaphragm 29a as shown in FIG.

In this case, the cylindrical shape of the hydraulic oil storage chamber 7a of the sub tank 7 is formed in a stepped cylindrical shape having a large diameter portion and a small diameter portion, and the oil separator 38
Can be fitted and attached. The bags 29a-1, 29a-2, 29a-3 of the diaphragm 29a
Is sealed by heat welding.

In this embodiment, the disc type brake device 1 to which the brake master cylinder 2 is applied,
Although it was attached to the rear wheel side of the motorcycle, it is not limited to this, and it is also possible to attach it to the front wheel side.

[Brief description of the drawings]

FIG. 1 shows a mounting structure in a state in which a disk type brake device to which a brake master cylinder according to one embodiment of the present invention is applied is mounted on a rear side of a motorcycle. It is a right outer side view.

FIG. 2 is a left inner side view of the mounting structure of FIG. 1 as viewed from the opposite side.

FIG. 3 is a partially enlarged sectional view of FIG. 1;

FIG. 4 is a partially enlarged view of FIG. 3;

5 is a perspective view of an oil separator-integrated diaphragm provided in a sub tank of the brake master cylinder of FIG. 1;

FIG. 6 is a view similar to FIG. 3, showing a modification of the oil separator.

FIG. 7 is a schematic plan view of a portion centered on a brake master cylinder and a swing arm as viewed from a direction A in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc type brake device, 2 ... Brake master cylinder, 3 ... Rear wheel, 4 ... Brake disc, 5 ... Caliper, 6 ... Master cylinder main body, 6a ... Cylinder chamber, 7 ... Sub tank, 7a ... Hydraulic oil storage chamber , 8… Brake hose, 9… Piston, 10… Link mechanism, 11… Swing arm, 12, 13… Stay, 14… Pivot plate,
15 ... bracket, 16 ... lower rear frame, 17 ... bolt connection part, 18 ... upper rear frame, 19 ... exhaust muffler, 20
… Eyeball fittings, 21… Banjo bolts, 22… Fasteners, 23…
Partition wall, 24 first port, 25 second port, 26 first
Opening, 27 ... second opening, 28 ... lid, 29 ... lid, 29a ...
Diaphragm, 29a-1, 29a-2, 29a-3 ... bag alone, 29b-
1, 29b-2, 29b-3 ... narrow groove, 30 ... cap, 30a ... passage, 30b ... narrow groove, 31 ... bolt, 32 ... universal joint, 33 ...
Mounting seat, 34 ... oil seal, 35 ... third opening, 36 ...
Holding plate, 36a: passage, 37: lid, 38: oil separator, 38a: small hole passage.

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[Procedure amendment]

[Submission date] October 18, 2001 (2001.10.
18)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG. 1 is a right outer side view showing a mounting structure in a state where a disk type brake device to which a master cylinder for brake according to an embodiment of the present invention is applied is mounted on a rear side of a motorcycle.

Claims (2)

[Claims] A motorcycle equipped with a master cylinder for brake, which is provided with a sub-tank for replenishing hydraulic oil for brake, which is located on the vehicle rear side of the main body of the master cylinder, is provided on the master cylinder main body. The brake master cylinder is vertically elongated in a vertical direction, and is disposed outside the vehicle body side of an arm that supports a rear wheel. The sub tank has a major axis that is a major axis of the master cylinder body. A motorcycle equipped with a master cylinder for braking, which is disposed so as to be positioned laterally outward of the vehicle body. 2. A motorcycle mounted with a master cylinder for brake provided integrally with a sub-tank for replenishing hydraulic fluid for brake disposed on a vehicle rear side of the main body of the master cylinder on the master cylinder main body. In the above, the master cylinder for brake is shaped to be vertically elongated in the vertical direction, and is disposed outside the vehicle body side of an arm supporting a rear wheel, and the sub-tank is an innermost side surface of the vehicle body side. A brake cylinder mounting portion for the brake hose on the master cylinder main body side, which is located on the vehicle body side outer side than the innermost side surface on the vehicle body side. Motorcycle equipped with.