JPH0112014Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a device for preventing a half-clutch condition in a clutch mechanism of a vehicle.

[Prior Art] If a driver constantly puts his or her foot on the clutch pedal out of habit, the clutch mechanism becomes half-clutched, which not only reduces power transmission efficiency but also causes abnormal wear on the clutch facing.

In the case of a hydraulic clutch mechanism, this problem can be solved by normally keeping the electromagnetic on-off valve inserted and connected in the piping closed, but this is not applicable to ordinary clutch mechanisms.

[Problems to be solved by the invention] The purpose of the invention is to solve the above-mentioned problems.
To provide a half-clutch prevention device which can be applied to an ordinary clutch mechanism and prevents the clutch pedal from operating under a load such as to lightly place one's foot on the clutch pedal.

[Means for solving the problem] In order to achieve the above object, the configuration of the present invention is such that a piston is fitted into a cylinder to define air chambers at both ends, and one of the cylinder and a rod connected to the piston is connected to a pedal lever. The other end is connected to the vehicle body side, and a check valve is provided in the through hole provided in the piston that opens when the piston returns, so that one end of the external passage that communicates the air chambers at both ends is closed at the return position of the piston. This is how it was done.

[Function] External passage 37 that communicates both end chambers of the cylinder 34
Since the end opening 35 of the pedal lever 3 is closed by the piston 31 when the pedal lever 3 is in its return position (the clutch mechanism is connected), the movement of the piston 31 is restricted, and when the clutch pedal 2 is lightly placed, the movement of the piston 31 is restricted. It will not be in a half-clutch state.

The check valve 33 opens during the return movement of the piston 31, and the through hole 32 as an internal passage opens the cylinder 3.
4, and the piston 31 is returned to the position where the external passage 37 is closed without resistance.

[Embodiment of the invention] As shown in FIG. 1, a pedal lever 3 having a clutch pedal 2 is connected to a rotation shaft 9 supported on the vehicle body side.
is combined with A return spring 7 is stretched between the arm 8 connected to the rotation shaft 9 and the vehicle body side fixing part 6, and the rod 14 is connected to the arm 5 connected to the rotation shaft 9 by a pin 4.

The rod 14 is engaged with the piston of a master cylinder 15 fixedly supported on the vehicle body side, and when it is pushed, the pressure fluid passes through the conduit 16 to the booster 23. At this time, the check valve 33 opens, and the through hole is opened as an internal passage. Since the air chambers at both ends of the cylinder 34 are communicated with each other by the piston 32, the piston 31 is completely returned without resistance until it abuts against the end wall 34a.

Sent out. The booster 23 boosts the hydraulic pressure by negative pressure or air pressure, and when the rod 22 is pushed, the clutch mechanism is shut off.

The clutch mechanism is housed in a housing 18 connected to one end of the transmission 17. A clutch lever 20 that disconnects and connects the clutch mechanism is located in the housing 1.
8 is supported by a rotating shaft 19, and the aforementioned rod 22 is connected to this end by a pin 21. This configuration is similar to a conventional clutch operating mechanism.

As shown in FIG. 2, the half-clutch prevention device 13 according to the present invention has a cylinder 34 connected to, for example, a vehicle body, and a piston 31 fitted in the cylinder 34.
A rod 12 is connected to the pedal lever 3 by a pin 10. A piston 31 is fitted inside the cylinder 34, and a rod 12 connected thereto.
is projected outward from the end wall 34a of the cylinder 34. A through hole 32 serving as an internal passage provided in the piston 31 is provided with a check valve 33 that opens when the piston 31 moves back (moves leftward). Also, piston 3
Openings 35 and 36 are provided at both ends of the peripheral wall of the cylinder 34 partitioned by 1, and these openings 35,
36 are communicated with each other by an external passage 37. In particular, the opening 35 is arranged at a distance of a stroke S from the end wall 34a.

In the above-described configuration, when the foot is placed on the clutch pedal 2, the rotation of the pedal lever 3 is prevented by the half-clutch prevention device 13 unless a strong pedaling force is applied. That is, when you put your foot on the clutch pedal 2, a force is applied to the rod 12 that pushes the piston 31 to the right in FIG. Since it is closed, piston 31
As a result, the air in the right end air chamber 40 of the cylinder 34 is compressed, and the movement of the piston 31 is suppressed. In this way, the pedal lever 3 returns to the spring 7.
Rotation is prevented by the resistance between the clutch and the half-clutch prevention device 13, and a half-clutch state is avoided.

When disengaging the clutch mechanism, press clutch pedal 2.
When a pedal force of more than a predetermined value is applied to the pedal lever 3,
The rod 12 is pushed to the right. piston 3
1 is pushed by a stroke S while compressing the air in the right end air chamber 40, the opening 35 opens into the cylinder 34.
Since it communicates with the left end air chamber of the piston 31
moves easily. The pedaling force required to obtain this stroke S is represented by a solid line in FIG. Note that the broken line represents the characteristics of the conventional clutch operating mechanism.

Furthermore, when the clutch pedal 2 is depressed, the rod 14 causes the fluid in the master cylinder 15 to flow into the conduit 16.
The pressure is then sent to the booster 23, where it is boosted by air pressure or negative pressure and transmitted to the rod 22, where the clutch lever 20 is rotated counterclockwise together with the rotation shaft 19, and the clutch mechanism is shut off. Ru.

When the clutch mechanism is connected, when the pedal force applied to the clutch pedal 2 is released, the pedal lever 3 is returned by the force of the return spring 7, and the piston 31 of the half-clutch prevention device 13 is also pulled back to the left.
At this time, the check valve 33 is opened and the air chambers at both ends of the cylinder 34 are communicated with each other through the through hole 32 as an internal passage, so the piston 31 is moved toward the end wall 34 without resistance.
It is completely returned until it collides with a.

[Effects of the invention] As described above, the present invention fits a piston into a cylinder to define air chambers at both ends, and connects one of the cylinder and the rod connected to the piston to a pedal lever.
The other end is connected to the vehicle body, and a check valve that opens when the piston returns is installed in the through hole provided in the piston, so that one end of the external passage that communicates the air chambers at both ends is closed when the piston returns to its position. Because of this, it has a simple structure and can be easily installed without making any changes to the conventional clutch operating mechanism.

At the return position of the pedal lever, the air chambers at both ends of the cylinder are sealed, exerting a drag force on the initial stroke of the pedal lever, so that placing your foot lightly on the clutch pedal will prevent the clutch mechanism from becoming half-clutched. , power transmission efficiency is improved, and wear and tear on the clutch facing is suppressed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a clutch operating mechanism equipped with a half-clutch prevention device according to the present invention, FIG. 2 is a sectional side view of the half-clutch prevention device, and FIG. 3 is an explanatory diagram of the operation of the device. 2...Clutch pedal, 3...Pedal lever,
5, 8...Arm, 7...Return spring, 9...Rotation axis,
12...rod, 13...half-clutch prevention device,
31...Piston, 32...Through hole, 33...Check valve, 34...Cylinder, 35, 36...Opening, 3
7...External passage.

Claims (1)

[Scope of utility model registration request] A piston is fitted into the cylinder to define air chambers at both ends, and one of the cylinder and the rod connected to the piston is connected to the pedal lever and the other to the vehicle body,
A half-clutch prevention device characterized in that a check valve that opens when the piston returns is provided in a through hole provided in the piston, and one end of an external passage that communicates air chambers at both ends is closed at the return position of the piston.