JP2017190107A - Reservoir tank mounting structure and motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a reservoir hose. SOLUTION: A reservoir tank (8) for storing brake oil has a mounting structure of a master cylinder (7) that generates a brake pressure in response to a brake operation, and a reservoir hose (80) that connects the reservoir tank and the master cylinder. And an air cleaner (5) arranged in the space surrounded by the vehicle body frame (2). The vehicle body frame includes a pivot frame (26) that swingably supports the swing arm (40), and a rear frame (25) that extends rearward from the pivot frame. The air cleaner projects below the rear frame, and the master cylinder is located behind the pivot frame and below the air cleaner. The reservoir tank is attached to the air cleaner below the rear frame. [Selection diagram] Fig. 2

Description

  The present invention relates to a reservoir tank mounting structure and a motorcycle.

  2. Description of the Related Art Conventionally, in a brake system for a motorcycle, independent brake devices (for example, disc brakes and drum brakes) are provided for front wheels and rear wheels. For example, in a hydraulic brake device, a master cylinder is connected between a brake lever (or brake pedal) and the brake device via a brake hose (see, for example, Patent Document 1). When the driver performs a brake operation, hydraulic pressure is generated in the master cylinder, and the generated hydraulic pressure is transmitted to the brake device via the brake hose. As a result, the brake device operates.

  A reservoir tank that stores brake oil is connected to the master cylinder. By supplying brake oil in the reservoir tank to the master cylinder, the shortage of oil is eliminated in the master cylinder.

Japanese Patent No. 3108882

  By the way, in a motorcycle brake system, there is a restriction on the mounting position of the master cylinder and the reservoir tank due to the space in the vehicle body frame. In particular, in Patent Document 1, the master cylinder and the reservoir tank are provided at separate locations. For this reason, there exists a problem that piping (reservoir hose) which connects a master cylinder and a reservoir tank will become long.

  SUMMARY An advantage of some aspects of the invention is that it provides a reservoir tank mounting structure and a motorcycle capable of shortening a reservoir hose.

  A reservoir tank mounting structure according to the present invention is a reservoir tank mounting structure for storing brake oil, and connects a master cylinder that generates brake pressure in response to a brake operation, and the reservoir tank and the master cylinder. A reservoir hose and an air cleaner disposed in a space surrounded by the vehicle body frame, wherein the vehicle body frame includes a pivot frame that swingably supports a swing arm, and a rear frame that extends rearward from the pivot frame. The air cleaner protrudes downward from the rear frame, the master cylinder is disposed below the air cleaner behind the pivot frame, and the reservoir tank is disposed below the rear frame. Specially attached to To.

  According to this configuration, the reservoir tank is attached to the lower side of the air cleaner and the master cylinder is provided below the air cleaner behind the pivot frame. Thereby, the reservoir tank and the master cylinder can be arranged close to each other. As a result, the reservoir hose can be shortened. Further, since the reservoir tank is attached to the air cleaner, it is possible to suppress the vibration of the vehicle body frame from being directly transmitted to the reservoir tank.

  In the reservoir tank mounting structure according to the present invention, it is preferable that an axial direction of the master cylinder is directed to the air cleaner in a side view. According to this configuration, the master cylinder and the reservoir tank can be brought closer to each other by bringing the tip of the master cylinder closer to the air cleaner.

  In the above-described reservoir tank mounting structure according to the present invention, it is preferable that the reservoir tank is disposed to be deviated inward in the vehicle width direction from the central axis of the master cylinder. According to this configuration, the reservoir tank can be prevented from protruding outward in the vehicle width direction from the master cylinder, and the appearance is improved.

  In the reservoir tank mounting structure according to the present invention, it is preferable that a recess is formed on a side surface of the air cleaner, and the reservoir tank is accommodated in the recess. According to this configuration, the amount of protrusion of the reservoir tank can be suppressed, and the appearance is improved.

  The reservoir tank mounting structure according to the present invention further includes a fender that covers a front side of a rear wheel provided at a rear end of the swing arm, and the fender is provided behind the reservoir tank. Is preferably arranged so as to overlap the fender in the vehicle width direction. According to this configuration, since the reservoir tank and the fender overlap in the vehicle width direction, water, dust, and the like splashed up by the rear wheels are blocked by the fender, so that water, dust, and the like are prevented from adhering to the reservoir tank. be able to.

  The motorcycle according to the present invention preferably includes the above-described reservoir tank mounting structure.

  According to the present invention, the reservoir hose can be shortened by arranging the reservoir tank close to the master cylinder.

1 is a schematic side view of a motorcycle to which a reservoir tank mounting structure according to an embodiment is applied. FIG. 2 is an enlarged view around a reservoir tank shown in FIG. 1. It is the perspective view which looked at the structure of the reservoir tank periphery which concerns on this Embodiment from the right rear. FIG. 3 is a cross-sectional view of the air cleaner and reservoir tank shown in FIG. 2 cut along the line XX. It is a rear view which shows the structure of the reservoir tank periphery which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following, an example in which the reservoir tank mounting structure according to the present invention is applied to a motorcycle equipped with a diamond-shaped frame will be described. However, the application target is not limited to this and can be changed. For example, the reservoir tank mounting structure according to the present invention may be applied to a motorcycle equipped with another type of frame, a buggy type motorcycle, or the like. Regarding the direction, the front of the vehicle is indicated by an arrow FR, the rear of the vehicle is indicated by an arrow RE, the left side of the vehicle is indicated by an arrow L, and the right side of the vehicle is indicated by an arrow R. In the following drawings, a part of the configuration is omitted for convenience of explanation. In particular, in FIG. 1, the engine, front wheels, and rear wheels are represented only by outlines.

  With reference to FIG. 1, a schematic configuration of the motorcycle according to the present embodiment will be described. FIG. 1 is a schematic side view of a motorcycle to which a reservoir tank mounting structure according to the present embodiment is applied.

  As shown in FIG. 1, a motorcycle 1 according to the present embodiment is configured by suspending an engine 3 on a body frame 2 made of steel or aluminum alloy. The vehicle body frame 2 is a so-called diamond-type frame, and is configured such that rigidity of the entire vehicle can be obtained by suspending the engine 3. The vehicle body frame 2 is formed by joining a plurality of frames by welding or the like.

  Specifically, the vehicle body frame 2 includes a main frame 21 that extends rearward and downward from the upper end of the head pipe 20, and a down frame 22 that extends rearward from the lower end of the head pipe 20. The main frame 21 branches right and left in the middle, and each extends rearward and downward. The down frame 22 is connected to a substantially central portion of the main frame 21. A hanger frame 23 extending downward is connected to the center of the down frame 22.

  A pair of left and right seat frames 24 extending rearward are connected to the central portion of the main frame 21. A seat (not shown) is supported on the seat frame 24. A pair of left and right rear frames 25 that support the seat frame 24 and a pivot frame 26 that supports the swing arm 40 are connected to the lower end of the main frame 21.

  The rear frame 25 extends rearward and upward from the lower end of the main frame 21 and is connected to the rear end of the seat frame 24. A bifurcated bracket 25a extends substantially rearward and downward in the center of the rear frame 25. A passenger's footrest 41 is provided at the tip of the bracket 25a. The pivot frame 26 extends downward from the lower end of the main frame 21. A swing arm pivot 26a for swingably supporting the swing arm 40 is formed at an intermediate portion in the extending direction of the pivot frame 26.

  In the vehicle body frame 2 configured as described above, the front side of the cylinder head 30 is supported by the hanger frame 23, and the rear side of the crankcase 31 is supported by the pivot frame 26. As a result, the engine 3 is suspended from the vehicle body frame 2.

  A front fork 42 is supported on the head pipe 20 via a steering shaft (not shown). A handle bar 43 is provided at the upper end of the steering shaft. A front wheel 44 is rotatably supported on the lower portion of the front fork 42.

  The front wheel 44 is provided with a brake disk (not shown), and the front fork 42 is provided with a brake caliper (not shown) that clamps the brake disk. Further, the front wheel 44 is covered with a front fender 45.

  The swing arm 40 extends rearward from the swing arm pivot 26a. A rear suspension (not shown) is provided between the swing arm 40 and the vehicle body frame 2 (pivot frame 26). A rear wheel 46 is rotatably supported at the rear portion of the swing arm 40.

  The rear wheel 46 is provided with a brake disk (not shown), and the rear end of the swing arm 40 is provided with a brake caliper (not shown) that holds the brake disk. The front side of the rear wheel 46 is covered with a rear inner fender 47 (see FIG. 2). The rear inner fender 47 is fixed to the upper surface of the swing arm 40.

  An air cleaner 5 is disposed on the rear upper side of the engine 3. The air cleaner 5 functions to filter air introduced from the outside and send it into the engine 3. The air cleaner 5 is disposed in a space surrounded by the vehicle body frame 2. Specifically, the air cleaner 5 is disposed below the seat frame 24 so as to be sandwiched between a pair of left and right rear frames 25. Although details will be described later, the lower half of the air cleaner 5 protrudes downward from the rear frame 25. The air cleaner 5 is connected to the intake port 32 of the engine 3 via the intake duct 50.

  A heel guard 60 that protects the driver's feet is attached to the rear side of the pivot frame 26. The heel guard 60 is formed in a substantially triangular shape in side view so as to form an acute angle toward the rear. The heel guard 60 also functions as a bracket for fixing the peripheral configuration.

  Specifically, a footrest 61 for a driver, a brake pedal 62 for a rear wheel, a master cylinder 7 for a rear brake, and the like are attached to the heel guard 60. The footrest 61 and the brake pedal 62 are provided on the outer surface of the heel guard 60 (outside in the vehicle width direction). The master cylinder 7 is provided on the inner surface (in the vehicle width direction) of the heel guard 60. The peripheral configuration of the heel guard 60 will be described later.

  A reservoir tank 8 for storing brake oil is provided above the heel guard 60. The reservoir tank 8 is attached to the lower end of the air cleaner 5. The master cylinder 7 and the reservoir tank 8 are connected by a reservoir hose 80 (see FIG. 2).

  By the way, in a motorcycle, when a master cylinder or a reservoir tank for a rear brake is attached, there are various restrictions on the attachment position due to the space in the vehicle body frame. For example, in a pedal-type rear wheel brake, it is preferable to directly transmit the operation of the brake pedal to the master cylinder. For this reason, the master cylinder is often provided in the vicinity of the brake pedal, and its mounting position is limited.

  In addition, when the reservoir tank is attached to the vehicle body frame, a dedicated bracket is required, which may increase the number of parts. Further, when the vibration of the vehicle is transmitted to the reservoir tank through the vehicle body frame, there is a possibility that bubbles (cavitation) are generated in the brake oil in the reservoir tank.

  If these bubbles are mixed in the brake hose, there is a possibility that the hydraulic pressure generated in the master cylinder cannot be properly transmitted to the brake device (for example, brake caliper) on the downstream side. Although it is conceivable to attach the reservoir tank to the vehicle body frame via a vibration isolating member such as rubber, the number of parts will increase eventually.

  Further, depending on the mounting position of the reservoir tank, there is a problem that the distance between the master cylinder and the reservoir tank is increased, and the reservoir hose connecting the both becomes long.

  Therefore, in the present embodiment, a part of the air cleaner 5 is protruded downward from the rear frame 25 and the reservoir tank 8 is directly attached to the lower part of the air cleaner 5. Since the air cleaner 5 has a predetermined volume and is formed of a resin material, the air cleaner 5 has an effect of damping the vibration of the vehicle. Therefore, since the reservoir tank 8 is directly attached to the air cleaner 5, the vibration of the vehicle is hardly transmitted to the reservoir tank 8 without increasing the number of parts.

  Further, by causing the air cleaner 5 to protrude downward from the rear frame 25, the air cleaner 5 can be disposed close to the pivot frame 26. As described above, by attaching the reservoir tank 8 to the lower portion of the air cleaner 5, the reservoir tank 8 was successfully brought closer to the master cylinder 7 provided behind the pivot frame 26. As a result, the reservoir hose 80 can be shortened.

  Next, the reservoir tank mounting structure and the rear wheel brake system will be described with reference to FIGS. FIG. 2 is an enlarged view around the reservoir tank shown in FIG. FIG. 3 is a perspective view of the configuration around the reservoir tank according to the present embodiment as viewed from the right rear. 4 is a cross-sectional view of the air cleaner and the reservoir tank shown in FIG. 2 cut along the line XX. FIG. 5 is a rear view showing the configuration around the reservoir tank according to the present embodiment. In FIG. 3, the heel guard is omitted for convenience of explanation.

  As shown in FIGS. 2 to 4, the air cleaner 5 is disposed in a lower space of the seat frame 24 (see FIG. 1). The air cleaner 5 is injection-molded by a resin material such as plastic. The air cleaner 5 has a box shape having a predetermined volume, and a lower half portion projects downward from the rear frame 25.

  On the right side surface of the air cleaner 5, a recess 51 is formed in the lower end portion that is recessed inward in the vehicle width direction. A boss 52 that protrudes outward in the vehicle width direction is formed at the boundary between the outer surface of the air cleaner 5 and the recess 51. A screw hole 53 for attaching the reservoir tank 8 is formed in the boss 52 (see FIG. 4).

  The reservoir tank 8 is injection-molded by a resin material such as plastic. The reservoir tank 8 has a bottomed cylindrical case 81 and a cap 82, and has a generally cylindrical shape. Brake oil is stored inside the case 81, and the case 81 and the cap 82 are integrated by screwing the cap 82 from above the case 81.

  A flange portion 83 that protrudes rearward is formed on the outer surface of the case 81. The flange portion 83 is formed with a through hole 83a through which the bolt 84 is passed (see FIG. 4). The reservoir tank 8 is fixed to the air cleaner 5 by inserting a bolt 84 through the through-hole 83 a and screwing the bolt 84 into the screw hole 53 of the boss 52.

  The reservoir tank 8 is provided with a regulating plate 85 that prevents the cap 82 from being inadvertently removed. For example, the restriction plate 85 is formed by bending a metal plate. Specifically, the restriction plate 85 rises upward along the outer shape of the reservoir tank 8 from the side surface of the flange portion 83, and is bent and formed radially inward at a position slightly higher than the upper surface of the cap 82. When the upper end portion of the restriction plate 85 comes into contact with the upper surface of the cap 82, the movement of the cap 82 is restricted. The restriction plate 85 is fastened to the air cleaner 5 (boss 52) with a bolt 84 together with the reservoir tank 8 (flange portion 83).

  Below the air cleaner 5, a master cylinder 7, a footrest 61 and a brake pedal 62 are attached to the rear of the pivot frame 26 via a heel guard 60. The master cylinder 7 extends vertically below the reservoir tank 8. At this time, the tip of the master cylinder 7 is directed to the reservoir tank 8. That is, the axial direction of the master cylinder 7 is directed to the air cleaner 5 in a side view.

  A brake pedal 62 is pivotally supported at the lower end of the master cylinder 7. The brake pedal 62 extends toward the front. A footrest 61 that protrudes outward in the vehicle width direction is provided on the right side surface of the brake pedal 62. The footrest 61 is located slightly in front of the lower end of the master cylinder 7. Further, the footrest 61 passes through the brake pedal 62 and is fixed to the heel guard 60. The brake pedal 62 is configured to be swingable about the footrest 61.

  A brake hose 70 is connected to the upper end of the master cylinder 7. The brake hose 70 extends forward, and is bent in a U shape before the pivot frame 26. The brake hose 70 extends rearward along the upper surface of the swing arm 40 and is connected to a brake caliper (not shown) at the rear end.

  In addition, a pipe connection port 71 protrudes toward the rear substantially at the center in the axial direction of the master cylinder 7. One end of a reservoir hose 80 is connected to the pipe connection port 71. The other end of the reservoir hose 80 is connected to the lower surface of the reservoir tank 8 (case 81). The reservoir hose 80 is made of a flexible material such as rubber. As shown in FIG. 2, the reservoir hose 80 extends from the pipe connection port 71 toward the front upper side to the reservoir tank 8, and is arranged in a curve in a substantially S shape in a side view.

  In the brake system for the rear wheel 46 (see FIG. 1) configured as described above, brake pressure is generated in the master cylinder 7 in accordance with the driver's brake operation. Specifically, when the brake pedal 62 is depressed by the driver, the tip of the brake pedal 62 rotates downward about the footrest 61. On the other hand, the rear end of the brake pedal 62 is rotated upward. As a result, the piston (not shown) of the master cylinder 7 is pushed upward, and hydraulic pressure is generated in the master cylinder 7.

  The generated hydraulic pressure is transmitted to the brake caliper via the brake hose 70. As a result, the brake caliper is activated. Further, since the reservoir tank 8 is arranged above the master cylinder 7, air does not flow into the master cylinder 7 side, and only brake oil is always supplied. For this reason, the oil shortage of the master cylinder 7 is eliminated.

  Further, as described above, in this embodiment, the reservoir tank 8 is directly attached to the air cleaner 5. For this reason, it is not necessary to prepare a bracket dedicated to the reservoir tank 8, and the reservoir tank 8 can be fixed without increasing the number of parts. Further, since the reservoir tank 8 is fixed via the air cleaner 5, the vibration of the vehicle is hardly transmitted to the reservoir tank 8. For this reason, it is possible to prevent bubbles from being generated in the brake oil in the reservoir tank 8.

  Further, a reservoir tank 8 is attached to the air cleaner 5 and a rubber reservoir hose 80 is connected to the reservoir tank 8, whereby the reservoir tank 8 storing brake oil is used as a mass body of the mass damper, and the reservoir hose 80 is used as a damper. Can function as. Thereby, the vibration damping effect of the air cleaner 5 can be obtained.

  Further, as shown in FIG. 4, the reservoir tank 8 is arranged so that a part of the reservoir tank 8 is accommodated in the recess 51 of the air cleaner 5 in the vehicle width direction. For this reason, the protrusion amount of the reservoir tank 8 in the vehicle width direction outer side can be suppressed. Therefore, the appearance of the entire vehicle is improved.

  Further, as shown in FIG. 5, the reservoir tank 8 is arranged to be biased inward in the vehicle width direction from the master cylinder 7. Specifically, the central axis C1 of the reservoir tank 8 is located on the inner side in the vehicle width direction than the central axis C2 of the master cylinder 7. Thereby, it is possible to prevent the reservoir tank 8 from protruding outward in the vehicle width direction from the master cylinder 7. Therefore, the appearance of the entire vehicle is further improved.

  Further, as shown in FIG. 5, a rear inner fender 47 is provided behind the reservoir tank 8. The rear inner fender 47 has substantially the same width as the left and right width of the swing arm 40 in the rear view. In this case, the reservoir tank 8 is disposed so as to overlap the rear inner fender 47 in the vehicle width direction. Accordingly, for example, water, dust, and the like that are splashed up by the rear wheel 46 during traveling are blocked by the rear inner fender 47, so that water, dust, and the like can be prevented from adhering to the reservoir tank 8.

  As described above, in the present embodiment, the reservoir tank 8 is attached to the lower side of the air cleaner 5 and the master cylinder 7 is provided below the air cleaner 5 behind the pivot frame 26. Thereby, the reservoir tank 8 and the master cylinder 7 can be disposed close to each other. Particularly, when the axial direction of the master cylinder 7 is directed to the air cleaner 5 in a side view, the tip of the master cylinder 7 can be brought closer to the air cleaner 5, and the master cylinder 7 and the reservoir tank 8 can be brought closer to each other. Thus, the length of the reservoir hose 80 that connects the reservoir tank 8 and the master cylinder 7 can be shortened. Further, by attaching the reservoir tank 8 to the air cleaner 5, it is possible to suppress the vibration of the vehicle body frame 2 from being directly transmitted to the reservoir tank 8.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above-described embodiment, the disk type brake device has been described as an example, but the present invention is not limited to this. For example, a drum type brake device may be used.

  In the above-described embodiment, the reservoir tank 8 is directly attached to the air cleaner 5. However, the present invention is not limited to this configuration. The reservoir tank 8 may be attached to the air cleaner 5 via a vibration isolating member such as rubber. Thereby, the further anti-vibration effect can be acquired.

  In the above-described embodiment, a part of the reservoir tank 8 is accommodated in the recess 51 of the air cleaner 5. However, the present invention is not limited to this configuration. You may comprise so that the whole reservoir tank 8 may be accommodated in the recessed part 51. FIG.

  As described above, the present invention has an effect that the reservoir hose can be shortened, and is particularly useful for a reservoir tank mounting structure and a motorcycle.

1 Motorcycle 2 Body frame 25 Rear frame 26 Pivot frame 40 Swing arm 46 Rear wheel 47 Rear inner fender (fender)
5 Air cleaner 51 Recess 7 Master cylinder 8 Reservoir tank 80 Reservoir hose

Claims (6)

A reservoir tank mounting structure for storing brake oil,
A master cylinder that generates brake pressure in response to brake operation;
A reservoir hose connecting the reservoir tank and the master cylinder;
An air cleaner disposed in a space surrounded by the body frame,
The vehicle body frame includes a pivot frame that swingably supports a swing arm, and a rear frame that extends rearward from the pivot frame.
The air cleaner protrudes downward from the rear frame;
The master cylinder is disposed below the air cleaner behind the pivot frame,
The reservoir tank mounting structure, wherein the reservoir tank is mounted on the air cleaner below the rear frame.   2. The reservoir tank mounting structure according to claim 1, wherein an axial direction of the master cylinder is directed to the air cleaner in a side view.   3. The reservoir tank mounting structure according to claim 1, wherein the reservoir tank is arranged to be offset inward in the vehicle width direction from a central axis of the master cylinder. A concave portion is formed on a side surface of the air cleaner,
The reservoir tank mounting structure according to any one of claims 1 to 3, wherein the reservoir tank is accommodated in the recess. A fender that covers a front side of a rear wheel provided at a rear end of the swing arm;
The fender is provided behind the reservoir tank,
The reservoir tank mounting structure according to any one of claims 1 to 4, wherein the reservoir tank is disposed so as to overlap the fender in a vehicle width direction.   A motorcycle comprising the reservoir tank mounting structure according to any one of claims 1 to 5.

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