JPH0453463Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hydraulically actuated clutch device, and more particularly to a hydraulic piping structure of the hydraulic clutch device.

BACKGROUND ART AND PROBLEMS Generally, in a vehicle equipped with a manual transmission, power transmission between the engine and the transmission is temporarily disconnected by a clutch device during a gear shifting operation.

By the way, this clutch device is, for example,
As disclosed in NISSAN Service Bulletin No. 422, hydraulically operated models are generally used, and the hydraulic pressure (hydraulic pressure) generated in the master cylinder when the clutch pedal is depressed is applied to the clutch via hydraulic piping. The transmission is transmitted to an operating cylinder on the unit side, and when this operating cylinder is operated, the clutch disk is separated from the flywheel of the engine.

By the way, in such a hydraulic clutch device, when the clutch pedal is depressed, the vibration of the flywheel caused by the bending vibration of the crankshaft causes the operating force to be activated via the spring that always presses and biases the clutch disk in the connection direction. This is input to the cylinder piston as axial vibration.

Then, the piston vibration propagates from the operating cylinder through the hydraulic fluid in the hydraulic piping as pressure pulsations, and is input to the master cylinder.

However, when pressure pulsations are propagated from the hydraulic piping to the master cylinder in this way, the excitation force generated at the bent part of the hydraulic piping ("Actual Equipment Diagnosis Using the Vibration Method" by Makishi Osamu, Japan Management Association) issue,
(see pages 240 to 243), a moment acts on the master cylinder, and the master cylinder generates oscillation vibration around the attachment portion to the vehicle body (usually the dash panel).

For this reason, the darts panel is vibrated by the vibration of the master cylinder, and especially when the excitation frequency is at a specific frequency such as about 200 to 400 (Hz), an abnormal "go" sound is generated. Put it away.

Therefore, as a means to dampen the pressure pulsations in the hydraulic piping, a clutch damper may be provided in the middle of the hydraulic piping, as disclosed in the NISSAN Service Bulletin No. 442, or
As proposed by the applicant in No. 26889, a branch pipe that resonates with the pressure pulsation may be provided in the middle of the hydraulic piping.

However, in the case of the former type, which is equipped with a clutch damper, the structure is complicated, and some hydraulic pressure is also supplied to the clutch damper when the clutch pedal is depressed, so the amount by which the clutch pedal is depressed increases. It will be done.

On the other hand, in the latter case where a branch pipe is provided,
In order to achieve more effective vibration damping, it is necessary to increase the diameter or length of the branch pipe, which increases costs and increases the volume of the entire pipe, making it difficult to fill the clutch hydraulic fluid. There is a problem in that it takes a long time to vent the air, which deteriorates work efficiency.

Therefore, the present invention has developed a hydraulic clutch that can prevent or significantly reduce the oscillation vibration induced in the master cylinder by canceling out the excitation force input to the master cylinder without attenuating the pulsation itself. The purpose is to provide a hydraulic piping structure for the device.

Means for Solving the Problems In order to achieve the above object, the present invention provides the hydraulic pressure generated in the master cylinder is supplied to the operating cylinder on the clutch unit side through the hydraulic piping. In a hydraulic clutch device in which a clutch unit is operated, the hydraulic piping is divided into two on the master cylinder side, and each of the divided branch pipings is connected to an opposite side of the master cylinder. .

Effect With the hydraulic piping structure of the hydraulic clutch device according to the present invention, the hydraulic pressure generated in the master cylinder is transferred to the operating cylinder via two branch piping and the original hydraulic piping. is supplied to

On the other hand, the hydraulic pulsations generated on the operating cylinder side are propagated to the master cylinder via the hydraulic piping and two branch pipings.
Since the main branch pipes are connected to the master cylinder facing each other, the excitation forces generated in each branch pipe cancel each other out when input to the master cylinder.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

That is, FIGS. 1 and 2 show an embodiment of a hydraulic clutch device 10 using the hydraulic piping structure of the present invention, and FIG. 1 shows the main parts of the overall configuration of the hydraulic clutch device 10. Cross-sectional side view, Figure 2 is in Figure 1 -
FIG. 3 is an enlarged cross-sectional view of the line.

The hydraulic clutch device 10 includes a master cylinder 14 that generates hydraulic pressure when a clutch pedal 12 is depressed, and a clutch unit 20 disposed between an engine 16 and a transmission 18. The operating cylinder 22 on the 20 side is connected via a hydraulic piping 24.

The master cylinder 14 has a casing 14
a piston 14b slidably and liquid-tightly fitted within a;
The cylinder chamber 14c is separated by the cylinder chamber 14c, and when the piston 14b is pushed in against the biasing force of the spring 14d by depressing the clutch pedal 12, hydraulic pressure is generated in the cylinder chamber 14c. .

The master cylinder 14 is fixed to the dash panel 26 by bolts 28 and nuts 28a via a flange 14e provided at one end (right end in the figure). Note that 14f is a reservoir tank.

On the other hand, in the clutch unit 20, a clutch disk 20a provided on the input shaft 18a of the transmission 18 is connected to the engine 1.
The flywheel 16b provided on the crankshaft 16a of No. 6 and the pressure plate 20b are always pressed together via a spring 20c.

By supplying hydraulic pressure to the operating cylinder 22, the push rod 22
a is protruded and the with-drawing lever 20d is rotated, and as the with-drawing lever 20d is rotated, the release bearing 20e moves on the input shaft 18a and presses the pressure plate 20b.
be moved in the direction.

Then, the pressure plate 20b is separated from the clutch disk 20a via the lever 20f, and the clutch is disengaged.

The operating cylinder 22 is fixed to the transmission housing 18b, and the casing 22
When hydraulic pressure is supplied to the cylinder chamber 22c inside the piston 22c, the piston 22d moves and the push rod 22a is projected.

Here, in this embodiment, the master cylinder 14 side of the hydraulic piping 24 is distributed to two branch pipings 32, 34 via a three-way connector 30, and the distributed branch pipings 32, 34 are connected to the master cylinder 14 side of the hydraulic piping 24. cylinder 1
4 on opposite sides of the vehicle in the left-right direction.

At this time, it goes without saying that the branch pipes 32 and 34 are communicated with the inside of the cylinder chamber 14c.

The three-way connector 30 is connected to the dash panel 26.
The branch pipes 32 and 34 which are fixed to the three-way connector 30 and distributed from the three-way connector 30 are each formed to have the same length, and each is bent with a symmetrical curvature with the master cylinder 14 as the center.

With the above configuration, in the hydraulic piping structure of this embodiment, the hydraulic pressure generated in the cylinder chamber 14c of the master cylinder 14 when the clutch pedal 12 is depressed is transferred to the two branch pipings 32, 34 and the hydraulic Operating cylinder 22 via pressure pipe 24
is supplied to the cylinder chamber 22c, and the clutch is disengaged.

On the other hand, when the clutch pedal 12 is depressed, vibrations caused by vibrations of the flywheel 16b are generated in the piston 2 of the operating cylinder 22.
2d, this vibration becomes hydraulic pressure pulsation and moves into the cylinder chamber 2 of the operating cylinder 22.
Hydraulic pressure piping 24 and two branch piping 32 from 2c,
34 into the cylinder chamber 14c of the master cylinder 14.

At this time, the branch pipes 32 and 34 are distributed to the three
Since the directional connector 30 is fixed to the darts panel 26, an excitation force that causes the master cylinder 14 to swing and vibrate is generated at the bent portions of the branch pipes 32 and 34 extending from the three-way connector 30 to the master cylinder 14. In this embodiment, the two branch pipes 32 and 34 are connected to the master cylinder 14.
Since each branch pipe 3 is arranged symmetrically with respect to
The excitation forces inputted to the master cylinder 14 from the master cylinders 2 and 34 are equal, and the respective excitation forces are applied in opposite directions.

Therefore, the excitation forces generated in each of the branch pipes 32 and 34 cancel each other out when input to the master cylinder 14, and the oscillation of the master cylinder 14 is prevented.

Therefore, vibrations caused by the pressure pulsation are not inputted from the master cylinder 14 to the dash panel 26, and therefore, generation of "go" sound in a specific frequency range is also prevented.

FIG. 3 shows another embodiment, in which the same components as those in the above embodiment are denoted by the same reference numerals and redundant explanations will be omitted.

That is, in this embodiment, the branch pipes 32 and 34 are laid out in consideration of the piping space near the master cylinder 14. In an actual vehicle, there is normally a brake pipe on the dash panel 26 near the master cylinder 14. A large number of master panels, master cylinders, and other auxiliary equipment are arranged, making it difficult to lay out the branch pipes 32 and 34 in the left-right direction of the vehicle.

Therefore, in this embodiment, each branch pipe 32, 34 distributed by a three-way connector 30 is connected to vertically opposite sides of the master cylinder 14, and interference with other auxiliary equipment is prevented. It's summery.

In this embodiment, each branch pipe 32, 34
Although the length and shape of are not symmetrical with respect to the master cylinder 14, the excitation force generated in one of the branch pipes 32 and 34 can be reduced by the excitation force generated in the other, compared to the conventional one. Thus, the oscillation vibration of the master cylinder 14 can be significantly reduced.

Effects of the invention As explained above, in the hydraulic piping structure of the hydraulic clutch device of the invention, the master cylinder side of the hydraulic piping that communicates the master cylinder and the operating cylinder is divided into two branch pipings. death,
Since each branch pipe is connected to the opposite side of the master cylinder, the excitation force generated in each branch pipe by the pressure pulsation propagated from the operating cylinder to the master cylinder via the hydraulic pipe is , cancel each other out at the time they are input to the master cylinder.

Therefore, it is possible to prevent or significantly reduce the oscillation of the master cylinder caused by the pressure pulsation, and to reduce the vibration noise of the master cylinder mounting part caused by the oscillation of the master cylinder. It is possible to reduce the

Furthermore, by reducing the oscillation of the master cylinder, bending fatigue of the piping connected to the master cylinder can be significantly reduced, and the durability of the piping connection can be significantly improved. play.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view of main parts showing the overall configuration of the present invention, Fig. 2 is an enlarged cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is an enlarged cross-sectional side view of main parts showing another embodiment of the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 10... Hydraulic clutch device, 14... Master cylinder, 16... Engine, 18... Transmission, 20... Clutch unit, 22...
...Operating cylinder, 24...Hydraulic pressure piping, 32, 34... Branch piping.

Claims (1)

[Claims for Utility Model Registration] A hydraulic clutch device in which a clutch unit is operated by supplying hydraulic pressure generated in a master cylinder to an operating cylinder on the clutch unit side via a hydraulic piping. A hydraulic piping structure for a hydraulic clutch device, characterized in that the hydraulic piping is divided into two on the master cylinder side, and each of the distributed branch pipings is connected to an opposite side of the master cylinder. .