JPS6288652A - Hydraulic operating apparatus for vehicle such as motorcycle - Google Patents

Abstract

PURPOSE:To suppress the increase of the compression rate of oil by installing a plate-shaped projection into a reservoir tank for feeding oil into the pressurizing chamber of a master cylinder. CONSTITUTION:The pressurizing chamber 19 of a master cylinder 25 is formed onto the opposite side of a clutch lever 14 around a piston 18. Oil is supplied into the pressurizing chamber 19 from a reservoir tank 22, and four spherical projections 27 are installed outside the chassis in the reservoir tank 22. Therefore, the heat of the oil whose temperature rises because of pressurization is transmitted to the tank body 22a through a plate-shaped projection 27, and effectively transmitted outside the reservoir tank 22. Therefore, the rise of the oil temperature is prevented, and the increase of the compression rate of oil is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic operating device that is attached to a bar handle of a vehicle such as a motorcycle.

(Prior Art) Motorcycles are sometimes equipped with hydraulic operating devices for operating clutches, brakes, etc. This hydraulic operating device is operated by pulling a lever provided at the rotating end of a bar handle. There is one that increases the oil pressure and uses this oil pressure to brake the rebrake that releases the clutch.

The above-mentioned hydraulic operating device is provided with a master cylinder that converts the force of the lever into hydraulic pressure, and a hydraulic reservoir tank, and communicates the inside of the reservoir tank with the pressurizing chamber to supply oil to the pressurizing chamber. An oil supply hole for this purpose is formed on the bottom of this reservoir tank.

When the piston is pushed by the rotation of the lever, the piston moves and first closes the oil supply hole and closes the pressurizing chamber. When the lever is further rotated, the oil in the pressurizing chamber is pushed to increase the hydraulic pressure, which is transmitted to the clutch and the like.

In the above case, it is desirable that the hydraulic pressure be transmitted as quickly as possible in order to improve responsiveness from the turning operation of the lever to the actuation of the clutch, etc. In this case, the oil is A low compression ratio is required.

(Problem to be solved by the invention) By the way, in a pressurized chamber, when oil is pushed by a piston, the oil is compressed and its temperature rises, but as this heat accumulates, the viscosity decreases and the oil's temperature increases. Compression ratio increases. Therefore, when the above-mentioned heat is accumulated and the oil reaches a high temperature, a disadvantage arises in that the above-mentioned responsiveness cannot be maintained satisfactorily.

In addition, in motorcycles, bar handles are usually rotatable around an axis that tilts backward as they move upwards (casters), so when the handlebars are turned, the The end will be tilted, and the reservoir tank will also be tilted accordingly.

Therefore, the oil in the reservoir tank tends to be biased toward one side of the reservoir tank, and the oil level in the other tank decreases, exposing the oil supply hole to the outside air. If air enters the pressurizing chamber due to the exposure of the oil supply hole, a predetermined oil pressure cannot be obtained, resulting in a disadvantage that the operability of the clutch and the like deteriorates.

Furthermore, when the motorcycle is heavily banked during cornering, there is a risk that the oil supply hole may be exposed in the same way as described above.

(Objective of the Invention) This invention was made in view of the above-mentioned circumstances, and is intended to prevent oil from becoming hot due to heat accumulation, and to prevent oil from reaching a high temperature from a reservoir tank to a pressurizing chamber. The purpose is to prevent the inconvenience of air entering a pressurizing chamber due to exposure of the supply hole to the outside air, and thereby to prevent the compressibility of oil from increasing.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a plate-like protrusion is provided within the reservoir tank.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show a first embodiment of the invention.

In the figure, reference numeral 1 denotes a motorcycle, the body frame 2 of which has a steering shaft tube 3 at the front end. This steering shaft tube 3 has an axis A that tilts rearward as it advances upward (caster), and a front fork 4 is rotatably supported on this steering shaft tube 3. A front wheel 5 is supported at the lower end of the front fork 4, and a bar handle 7 extending left and right is attached to the upper end. 8 is a fairing.

On the other hand, a rear wheel (not shown) is supported at the rear of the vehicle body frame 2, and is driven by an engine 9 supported by the vehicle body frame 2. 10 is a fuel tank.

A grip 12 for a rider to grasp is provided at the rotating end of the bar handle 7, and a hydraulic operating device 13 is provided near the grip 12 on the rotating end side of the bar handle 7. This hydraulic operating device 13 connects and disconnects a clutch (not shown).

The hydraulic operating device 13 has a clutch lever 14 rotatably supported in the middle of the bar handle 7, and a rotating end of the clutch lever 14 is disposed in front of the grip 12. Further, a master cylinder 15 is provided on the rotation end side of the bar handle 7 and operatively connected to the clutch lever 14.

The master cylinder 15 has a cylinder tube 17 and a piston 18 slidably inserted into the cylinder tube 17. One end side of the cylinder tube 17 partitioned by the piston 18 is a pressurizing chamber 19. The pressurizing chamber 19 is located on the opposite side of the clutch lever 14 with the piston 18 as the center, that is, on the inside of the vehicle body in the vehicle width direction in the cylinder tube 17 (hereinafter, this is simply referred to as the inside side of the vehicle body, and on the opposite side). is formed on the outer side of the vehicle body. Further, a spring 20 is provided in the pressurizing chamber 19 to bias the piston 18 toward the outside of the vehicle body.

is interlocked and connected to a pushing end 14a of the clutch lever 14 that projects from the pivot portion 7a side toward the inside of the vehicle body.

Further, the hydraulic operating device 13 has a reservoir tank 22 that supplies oil to the pressurizing chamber 19. The reservoir tank 22 includes a tank body 22a integrally formed on the cylinder tube 17, and a tank body 22a integrally formed on the cylinder tube 17. It is composed of a tank cover 22b which can open and close the upper opening of 22a, and an elastic diaphragm 22c interposed between these two.

The reservoir tank is provided on the cylinder tube 17 with good left and right balance in terms of appearance. The oil supply hole 23 that communicates the inside of the reservoir tank 22 with the pressurizing chamber 19 is connected to the tank body 2 in correspondence with the pressurizing chamber 19.
It is formed at the bottom of 2a. Further, an oil hole 25 is provided which communicates the space 24 formed between the inner circumferential surface of the cylinder tube 17 and the outer circumferential surface of the piston 18 with the inside of the reservoir tank 22.
is formed on the bottom surface of the tank body 22a.

When disengaging the clutch, the clutch lever 4 is rotated so as to be pulled toward the grip 12. Then, this clutch lever 14 rotates around the pivot portion 7a, and the pushing end 14a of this clutch lever 14
pushes the piston 18 toward the inside of the vehicle body, and the piston 18 first closes the oil supply hole 23 and closes the pressurizing chamber 19 while moving against the biasing force of the spring 20. When the clutch lever 14 is further pulled, the oil in the pressurizing chamber 19 is pushed to increase the oil pressure, and the clutch is disengaged by this oil pressure.

In the above configuration, four plate-shaped protrusions 27 are provided inside the reservoir tank 22 on the outer side of the vehicle body.

These plate-like protrusions 27 are provided to protrude upward from the inner bottom surface of the tank body 22a, and extend parallel to each other in the vehicle width direction. Further, the height of each of these plate-like protrusions 27 is formed to decrease toward the inside of the vehicle body.

Further, among the plate-shaped protrusions 27, a pair of plate-shaped protrusions 27.27 located closer to the center in the longitudinal direction of the vehicle body are
The inner side end of the oil hole 25 is formed to sandwich the oil hole 25 therebetween.

Also, there is a gap 2 between the outer end of the vehicle body of each plate-like projection 27 and the inner wall surface of the tank body 22a on the outer side of the vehicle body.
8 is formed. This gap 28 allows oil to flow between the left and right front spaces partitioned by the plate-like projections 27.

Each of the plate-shaped protrusions 27 transmits the temperature of the oil in the reservoir tank 22 to the tank body 22a. This heat is then radiated to the outside, thereby preventing the temperature of the oil from becoming high.

Further, when the bar handle 7 is steered (as shown by the dot-dashed line in FIG. 3), the bar handle 7 rotates around the axis of the steering shaft tube 3, so that the bar handle 7, for example, The end of the handle that is rotated rearward will be tilted downward toward the outside of the vehicle body. As a result, the sleeve inside the reservoir tank 22 moves toward the outside of the vehicle body, and the oil level changes from a nearly horizontal state (as shown by the solid line in Figure 4) to a state in which the oil level inside the vehicle body decreases. I'm trying. In this case, in the conventional reservoir tank 22, the oil level inside the vehicle body decreases (as shown by the dashed line in the figure), and the oil supply hole 23 tends to be exposed to the outside air. The protrusion 27 restricts the oil flow and suppresses the drop in the oil level (as shown by the two-dot chain line in the figure). Therefore, even if the oil level fluctuates, the oil supply hole 23 will not be exposed to the outside air. Therefore, air is prevented from entering the pressurizing chamber 19 through the oil supply hole 23.

FIG. 6 shows a second embodiment, and components common to the above embodiments are designated by reference numerals and their explanations are omitted.

In this configuration, four plate-shaped protrusions 30 extending in the longitudinal direction of the vehicle body are provided on the bottom surface of the tank body 22a on the outer side of the vehicle body within the reservoir tank 22. In this case, gaps 28 are formed between each of the plate-like protrusions 30 and the inner wall surface of the tank body 22a.

(Effects of the Invention) According to the present invention, since the plate-like protrusion is provided in the reservoir tank, the oil is pressurized in the master cylinder when operating the hydraulic equipment, and the temperature of the oil tends to rise.
The heat of this oil is transferred directly to the reservoir tank, and also via the plate-like projections. Therefore, the heat of this oil is effectively radiated from the outer surface of the reservoir tank, so that the oil is prevented from becoming high temperature. Therefore, the compressibility of the oil is prevented from increasing, and the responsiveness of the operation of this hydraulic equipment can be kept good.

Also, the reservoir tank may tilt due to steering of the bar handle, etc.
As a result, when the oil in the reservoir tank tries to flow in one direction, the plate-shaped protrusion is provided inside the reservoir tank, so this plate-shaped protrusion restricts the flow of the oil and causes the oil level to fluctuate. The occurrence of this is suppressed. For this reason,
The oil supply hole is prevented from being exposed to the outside air, and air is prevented from entering the pressurizing chamber, and in this respect, the compressibility of the oil is also prevented from increasing.

[Brief explanation of drawings]

1 to 5 show a first embodiment of the present invention, and a first embodiment of the invention is shown in FIG.
The figure is a sectional view taken along the line I-I in Figure 4, Figure 2 is a schematic front side view of the motorcycle, Figure 3 is a plan view taken along the ■-■ line in Figure 2, and Figure 4 is the 3 is a cross-sectional view taken along the line IV-■, FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 1, and FIG. 6 is a view corresponding to FIG. 1 in the second embodiment. lΦ・Motorcycle, 7. Bar handle, 13. Hydraulic operating device, 15. Fist master cylinder, 19. Pressure chamber.
2211・Reservoir tank, 23・・Oil supply hole, 27・
-Plate-like process, 30・Umbrella-like process, O@・Oil. Patent applicant Yamaha Motor Co., Ltd. Figure 2

Claims (1)

[Claims] 1. In a hydraulic operating device for a vehicle such as a motorcycle, which is provided with a master cylinder for operating hydraulic equipment on the rotating end side of the bar handle and a reservoir tank for supplying oil to a pressurizing chamber in this master cylinder, the reservoir A hydraulic operating device for a vehicle such as a motorcycle, characterized in that a plate-like projection is provided in a tank.