JPH0321396B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure for a rear master cylinder of a motorcycle.

Motorcycles are equipped with a master cylinder for the front brake and a master cylinder for the rear brake, and a foot brake is used for the rear brake.The master cylinder is installed behind the brake pedal, and the brake pedal is operated by foot. The master cylinder is generating hydraulic pressure.

The master cylinder is preferably installed behind the brake pedal if possible, and preferably close to this.Therefore, in the past, a dedicated mounting boss member or bracket was provided behind the center tube, and the master cylinder was mounted on the rear of the brake pedal. The cylinder is mounted and supported.

On the other hand, when the rear frame consisting of the seat rail, back stay, etc. is configured to be detachable from the front frame, a boss member or bracket is required to attach and support the back stay to the lower part of the center tube of the front frame. Since backstab brackets and master cylinder brackets are required individually, the number of parts increases, and the mounting parts of each are close to each other, so consideration must be given to the space layout. In addition to the above, since the master cylinder is installed bare, there is a risk of being hit by flying stones during off-road driving, etc., and improvements are desirable in terms of protection of the master cylinder.

The present invention has been made in view of the above.

The object of the present invention is a master cylinder,
In order to achieve the above objects, the present invention provides a master cylinder mounting structure for a motorcycle that can rationalize backstay installation, reduce the number of parts, improve installation workability, and protect the master cylinder. The cylinder is mounted and supported via a mounting boss protruding from the rear of the lower part of the center tube of the frame, and the front parts of two plate-shaped brackets provided on the left and right sides in the vehicle width direction are commonly tied to the mounting boss. The gist is that the master cylinder is surrounded by the bracket, and the front part of the backstay is tied to the rear part of the bracket.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a schematic side view of a motorcycle, in which the motorcycle 1 supports a front fork 4 that supports a front wheel 5 in a freely steerable manner via a head tube 3 at the front of a frame 2, and a handle 7 on a top bridge 6. Equipped with. The details of the frame 2 are as shown in Fig. 2, including a main frame 2a extending rearward from the upper part of the head tube 3, a down tube 2b hanging down from the lower part of the head tube 3, and a down tube 2b extending rearward from the lower end of the main frame 2a. It consists of an extended down tube blower 2c and a center tube 2d connecting the rear end of the down tube blower 2c to the rear end of the main frame 2a.In the embodiment, an extension member 2e is provided between the rear of the main frame 2a and the down tube 2b.
are constructed in the front-back direction. Through the above steps, the front frame 2 is formed. A fuel tank 8 is mounted on the front frame 2, and an engine 9 is mounted on the lower part.

A rear fork bracket 2f is fixed to the front of the lower part of the center tube 2d of the front frame 2, and the front end of the rear fork 10 is pivotally connected to this.The rear fork 10 extends rearward to support the rear wheel 11, and A rear action unit 12 is interposed between the front part of the main frame 2a and a bracket 2g that projects rearward from the rear end of the main frame 2a.

Rear frame 1 behind front frame 2
3, the rear frame 13 includes a seat rail 13a extending rearward from a bracket 2g at the rear end of the main frame 2a, and a seat rail 13a extending diagonally forward and downward from the middle rear part of the seat rail 13a, and a seat rail 13a extending diagonally forward and downward from the middle rear part of the seat rail 13a, and extending rearward from the bottom of the center tube 2d. Backstay 13 to be tied
The front end of the seat rail 13a is removably connected to the bracket 2g, and the front end of the back stay 13b is also removably connected to the rear of the lower part of the center tube 2d as will be described later. will be placed.

The lower part of the down tube 2b of the front frame 2, the down tube blower 2c, the center tube 2d, and the seat rail 13 of the rear frame 13.
a. Two back stays 13b are provided on the left and right sides, and a cross member is interposed between the left and right members of the down tube blower 2c and the seat rail 13a.

FIGS. 3 and 4 show the mounting portion of the master cylinder, and FIG. 7 shows an exploded perspective view of this portion.

At the lower end of the center tube 2d of the front frame 2, a mounting stay 16 for the brake pedal 15 is provided protruding rearward in the shape of a boss.
, the bolt 17 is screwed onto the mounting stay 16 via a welding nut 16a provided thereon, and the pedal 15 is pivotally mounted so as to be swingable.

At the bottom of the center tube 2d above the pedal mounting stay 16, there are upper and lower mounting stays 18, 1 at the rear.
9 is provided in a protruding manner, and mounting holes 18a and 19a are bored through the plate in the thickness direction. A master cylinder 20 is mounted and supported on the mounting stays 18 and 19, and the master cylinder is shown in detail in FIGS. 6 and 7.

The rod 20c of the piston 20b fitted in the cylindrical body 20a extends below the body 20a, and connects the lower inner diameter portion of the body 20a with the rod 20c.
A flexible dust boot 20d is disposed between the intermediate parts, and a return spring 20g is disposed between the top of the piston 20b and the ceiling 20f of the cylinder hole 20e of the body 20a.
is interposed, and a take-out part 20h is provided on the side near the ceiling.
is provided protrudingly, and the joint oil bolt 2 is attached to this.
The brake hose 21 is connected to a joint fitting 20j interposed between the end face of the mounting portion 20h and the oil bolt head, and connected to the brake caliper 22 for braking the rear wheel 12. Upper and lower mounting bosses 20k and 20l are integrally provided on the outer peripheral front surface of the body 20a, and these are connected by a rib 20m that is integrated with the body 20a.
A reservoir passage 20n is provided in m, and this is connected to the metal fitting 20n.
It is connected to the reservoir hose 23 through the tube p, and the hose 23 is connected to the reservoir cup 24 which is attached and supported at the middle part of the center tube 2d. Mounting holes 20q are provided in each of the above mounting boss portions 20k and 21l.

Reference numerals 25 and 26 denote outer and inner brackets.The brackets 25 and 26 have substantially triangular sides, are wide at the front and have a peak at the rear, and have circumferential pieces 25a on the top and bottom.
25b, 26a, and 26b are symmetrically bent to form a protruding transverse channel cross section, and are made of a press-formed steel plate material, etc., and the cross section and triangular shape provide necessary and sufficient strength and rigidity. Lower peripheral pieces 25a, 26a
Concave portions 25c, 2 are symmetrically formed in the middle or front portion of the
6c is provided, and the side pieces 25 of the brackets 25, 26 are provided.
d, 26d There are mounting holes 25e, 25 on the top and bottom in the front part.
f, 26e, and 26f are provided, and circular concave seats 25g, 25g are provided around the mounting holes 25e, 25f on the outer bracket side with a slightly larger diameter than the bolt heads, and the mounting holes 26e, 26f on the inner bracket side are provided with circular concave seats 25g, 25g in the vehicle width direction. 26g of welding nuts on the inner surface of the
Provide 6g.

Recessed seats 25h and 26h are provided at the rear portions of the side pieces 25d and 26d, into which mounting holes 25i and 26h are provided.
26i, a welding nut 26j is provided on the surface of the inner recessed seat portion 26h, and a hole 26k having a slightly larger diameter than the take-out portion 20h of the master cylinder 20 is provided in the intermediate portion of the side piece 26d of the inner bracket.

In the above, the upper and lower mounting boss portions 20k and 20l of the master cylinder 20 are attached to the mounting stays 18 and 1.
9, attaching holes 20q, 20q, 18
Match a and 19a. Overlap the brackets 25 and 26 from both sides of the body 20a of the master cylinder 20, and attach the mounting holes 25e and 2 at the front of the outer bracket 25.
5f surrounding area to upper and lower boss parts 2 of master cylinder
0k, 20l and align the holes 25e, 25f with the holes 20q, 20q. Lay the surrounding parts of the mounting holes 26e and 26f of the inner bracket 26 on the inner surfaces of the stays 18 and 19 of the center tube 2d of the frame, and insert the upper and lower mounting holes 2 of the outer bracket 25.
5e, 25f through the holes 20.
q, 20q, 18a, 19a, 26e, 26f and screwed into weld in nuts 26g, 26g, and the left and right brackets 25, 26 and master cylinder 20 are commonly connected to the stays 18, 19.

As a result, the master cylinder 20a is mostly surrounded by the brackets 25 and 26, and the recessed part 2
5c and 26c, the master cylinder 20 is vertically mounted and supported, and the upper peripheral pieces 25c and 26c are above the body 20a.
The lower part of the master cylinder 20 is hung down through the body 2, and the master cylinder 20 is vertically mounted and supported.
The upper part of 0a is covered with upper peripheral pieces 25b and 26b, and the mounting portion 20h is led out from a hole 26k of the inner bracket 26 inward in the vehicle width direction.

On the other hand, a mounting part 13c is provided at the front end of the backstay 13b facing diagonally downward to the front, and this is sandwiched between the recessed seats 25h and 26h provided at the rear of the outer and inner brackets 25 and 26. mounting hole 2
5i, the bolt 28 is passed from the outside through the mounting hole 13d provided in the mounting portion 13c and the inner mounting hole 26i, screwed into the welding nut 26j, and the backstay 13b is fixedly supported by the brackets 25 and 26;
That is, the front end of the back stay 13b is fixed and supported on the center tube 2d side of the front frame.

The above backstay 13b and bracket 25,
There are three attachment points in 26, and the connection is similar to a truss structure, resulting in high rigidity and strength. In addition, since the master cylinder 20 and the brackets 25 and 26 share the same mounting support, the number of parts can be reduced, and most of the parts of the master cylinder 20 are mounted on the bracket 2.
5 and 26 to protect it from the outside.

By the way, the already mentioned rod 20c has a spherical bearing 28.
Adjustably screw together the adjuster rod 28 provided with the bolt 28 so that the axial directions match, align the bearing 28a with the mounting hole 15c provided at the rear end of the rearwardly extending portion 15b of the boss portion 15a of the brake pedal 15, and then tighten the bolt 2.
9. They are connected by a nut 30, and the pushing force caused by depressing the pedal 15 is transmitted to the piston 20b via the rods 28, 20c to generate braking oil pressure.
b is a lock nut.

In addition, as shown in FIG. 4, the side piece 25 of the outer bracket 25
The rear part of d is bent inward and the front bolt 27
The head 27a does not protrude outside the side piece 25d because the peripheries of the mounting holes 25e and 25f are concave seats 25g and 25g, and therefore does not interfere with foot pedal operation.

8 to 12 show modified embodiments.

Side piece 126d of triangular inner bracket 126
The long front end portion of the center tube 2d is welded to the inner side of the rear surface of the center tube 2d, and the master cylinder stays 118, 119 are welded to the outer side of the rear surface of the center tube 2d apart from this. Outer bracket 1
25, the downwardly long extending portion 125j is connected to the side piece 125d.
In the front part, the master cylinder 20 has the same structure as described above, and is provided so as to protrude upward so that the take-out part 120h faces diagonally upward and inward. The boss parts 20k and 20l of the master cylinder 20 are inserted between the front part of the inner bracket 126 and the stays 118 and 119 via the collar 31, and the outer bracket 125 is stacked from the outside.
The bracket 125 has counterbore holes 125 that match the stays 118, 119 and the boss portions 20k, 20l.
e, 125f, and countersunk screws 127, 12 from the outside.
7 and screw it onto the 126g welding nut of the inner bracket. Bracket 12
The mounting portion 13c of the backstay 13b is inserted between the rear portions of the backstays 13b and 126, and the bolts 28 and welding nuts 126j are used to connect the bolts 28 and welding nuts 126j in the same manner as described above. The side piece 126d of the inner bracket 126 has a recess 126k that bulges inwardly and is open upward at the center of the upper part, and a recess 125k that bulges outward at the center of the side piece of the outer bracket 125, and further has a recess 126k at the upper end. is provided with a top piece 125a that is bent inward, so as to cover the outside of the master cylinder 20 in the attached state and cover the upper part of the master cylinder in accordance with the inclination of the discharge part 120h inward and upward. did.

By the way, the extending portion 125 of the outer bracket 125
A recessed mounting hole 125l is provided in j, and this is aligned with a screw hole 117a provided in the head of the brake pedal pivot bolt 117, and the lower end of the extending portion 125j is connected to the outer surface of the bolt 117 via a countersunk screw 132. do. The flat screws mentioned above do not get in the way of your feet when operating the pedals. Note that other parts are the same as those described above, so the same parts are given the same reference numerals and detailed explanations are omitted.

As detailed above, according to the present invention, it is possible to rationally mount and support the master cylinder and the backstay to the front frame with a structure excellent in strength and rigidity, and the number of parts can be reduced as a result of the above. In addition, the master cylinder has many advantages such as being surrounded by a bracket and a center tube, which is advantageous in terms of protection.

[Brief explanation of the drawing]

Figure 1 is a side view of the motorcycle, Figure 2 is a side view showing the frame structure, Figure 3 is an enlarged side view of the master cylinder mounting part, Figure 4 is a sectional view taken along line 4-4 in Figure 3, and Figure 5 is a side view of the motorcycle. 6 is a side view of the master cylinder, FIG. 7 is an exploded perspective view of the master cylinder mounting member, FIG. 8 is a view similar to FIG. 2 of the modified embodiment, and FIG. Figure 9 is a view similar to Figure 3, Figure 10 is a sectional view taken along the line 10-10 in Figure 9, and Figure 1
1 is a sectional view taken along line 11-11 in FIG. 9, and FIG. 12 is an exploded perspective view similar to FIG. 7. In the drawing, 2 is a frame, 2d is a center tube, 15 is a brake pedal, 18 and 19 are mounting bosses, 20 is a master cylinder, 25 and 26 are brackets, and 13b is a backstay.

Claims (1)

[Claims] 1. The master cylinder is mounted and supported via a mounting boss protruding from the rear of the lower part of the center tube of the frame facing the rear of the brake pedal, and in front of two plate-shaped brackets provided on the left and right sides in the vehicle width direction on the mounting boss. 1. A master cylinder mounting structure for a motorcycle, characterized in that the master cylinder is surrounded by a bracket which is commonly connected to the rear part of the backstay, and the front part of a backstay is connected to the rear part of the bracket.