JPH0116692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a remote clutch control device for a specially equipped vehicle whose loading platform is equipped with a winch or the like driven by power extracted from a vehicle propulsion engine.

[Background technology]

In the special purpose vehicles mentioned above, power for equipment such as winches is extracted from a power extraction device called a PTO attached to the transmission. In vehicles equipped with this type of equipment, the clutch located between the engine and transmission can be controlled not only from the driver's seat, but also from the driver's seat, so that work can be controlled from the cargo bed side.
It is desirable to be able to operate it on the loading platform side as well. For this purpose, a clutch operating lever was placed on the loading platform so that a worker standing next to the loading platform could remotely control the clutch, but in the past, the clutch could be controlled directly by operating the operating lever. Since the release cylinder was driven, a large amount of force was required to operate the clutch, which was a burden on the operator.

[Purpose of the invention]

The present invention has been made in view of these points, and its purpose is to provide a clutch remote control device for specially equipped vehicles that allows the clutch to be operated with light force not only from the driver's seat but also from the cargo bed side. There is something to do.

[Disclosure of the invention]

Therefore, the present invention provides a clutch control master cylinder that responds to a clutch pedal disposed in the driver's seat of a vehicle, and an auxiliary clutch control master cylinder that responds to a clutch lever disposed in the cargo bed of a vehicle. It is characterized in that it is connected to a vacuum booster for driving the clutch release cylinder via a switching cylinder that sends one of the high pressure side of the two hydraulic inputs from the cylinder to the output side, The present invention will be described in detail below based on the illustrated embodiment.The illustrated specially equipped vehicle is for electric wire work, and is equipped with a winch 8 used for hoisting and suspending a pole-mounted transformer, and a wire winding drum. A winding shaft 9 is attached to the winding shaft 9 and used for winding the electric wire. These rotational drives are performed by extracting the power of the vehicle's propulsion engine from the power extraction device 11 attached to the transmission 10 as described above. Power extraction device 1
1 is from driveshaft 12 to gearbox 1
3, and is connected to a control gear box 15 via a drive shaft 14. This control gear box 15 selectively transmits its output to the winch 8 and the take-up shaft 9, and also incorporates a transmission, and is used to switch between high and low rotational speeds of the winch 8 and the take-up shaft 9. and the direction of rotation can be switched. In the figure, 16 is a height switching lever, 17 is a rotation direction switching lever, and 18 and 19 are switching levers between the winch 8 and the winding shaft 9. Further, 20 is a protector for protecting the operator. The wire wound around the winch 8 is
The wire is drawn out through a traverser 21, a guide roller 22, and a roller assembly 23 surrounding the wire on four sides. Note that the rear wheels of this vehicle can be separated from the axle shaft.

Now, an operating lever 25 for operating the clutch located between the engine and the transmission 10 is installed on the cargo bed of this vehicle, and the clutch can be operated not only from the driver's seat but also from the side of the cargo bed. However, the clutch pedal 2 in the driver's seat
6, and between the operating lever 25 and the clutch, a switching cylinder 3 and a vacuum booster 4 are provided as shown in FIG. In the figure, 1 is the master cylinder, 2 is the auxiliary master cylinder,
5 is the clutch release cylinder, and 6 is the clutch release fork.

To explain the switching cylinder 3 and the vacuum booster 4, the switching cylinder 3 receives hydraulic input from the master cylinder 1 which converts the pedal force applied to the clutch pedal 26 into hydraulic pressure, and the operating lever 25.
Of the two inputs, the hydraulic input from the auxiliary master cylinder 2 which converts manual operating force applied to the hydraulic pressure into hydraulic pressure, the high pressure side hydraulic pressure is outputted and transmitted to the vacuum booster 4, It has a piston 30, a valve 31, and a valve rod 32 connecting the piston 30 and the valve 31 inside. A piston 3 separates the master cylinder 1 side and the auxiliary master cylinder 2 side.
0 is located on the left in the figure, the valve 31 is open and the hydraulic pressure generated by pressing the clutch pedal is transmitted to the vacuum booster 4 through the valve 31. When the operating lever 25 is operated, the hydraulic pressure generated in the auxiliary master cylinder 2 moves the piston 30 to the right in the figure. At this time, the piston 30 pushes the valve rod 32 to first close the valve 31, and then sends the oil in the switching cylinder 3 to the vacuum booster 4. Note that when the clutch pedal 26 and the operating lever 25 are operated at the same time, the higher pressure of the two hydraulic inputs sent to the switching cylinder 3 and acting on both sides of the piston 30 determines whether the valve 31 opens or closes. Then, the higher hydraulic pressure is transmitted to the vacuum booster 4.

Vacuum booster 4 that increases oil pressure by using the negative pressure generated by the engine during its intake process or the differential pressure between the negative pressure generated by the vacuum pump and atmospheric pressure
The figure shows a diaphragm type.
This vacuum booster 4 itself is well known, so to briefly explain its operation, the front and rear of the power piston 40 are normally in communication with the intake manifold 60 of the engine, and the same negative pressure is maintained. For this reason, the power piston 40,
The center rod 45 and the hydraulic piston 41 are in a state of being moved to the left in the figure. Now, when the hydraulic pressure from the master cylinder 1 or the auxiliary master cylinder 2 is transmitted via the switching cylinder 3, the hydraulic pressure acts on the back surface of the hydraulic piston 41 and the upper surface of the relay valve piston 42, causing the relay valve piston 42 to move. The downward movement closes the vacuum valve 43 and then opens the atmospheric valve 44.
As a result, atmospheric air flows into the control chamber 46 behind the power piston 40 attached to the diaphragm 53, applying atmospheric pressure to the rear surface of the power piston 40. Since the vacuum chamber 47 in front of the power piston 40 is maintained at the negative pressure,
This pressure difference causes the power piston 40 to move forward together with the center rod 45 and the hydraulic piston 41, sending oil in the hydraulic chamber 48 to the clutch release cylinder 5. The hydraulic pressure sent to the clutch release cylinder 5 at this time is the sum of the hydraulic pressure sent through the switching cylinder 3 and applied to the back of the hydraulic piston 41 and the atmospheric pressure applied to the back of the power piston 40. It has a much higher pressure than the hydraulic pressure developed in cylinder 1 or auxiliary master cylinder 2. Therefore, the operating force required on the operating lever 25 to move the clutch release fork 6 and disengage the clutch is extremely light. Of course, the pressing force on the clutch pedal 26 has also become lighter. To connect the clutch, simply release your foot from the clutch pedal 26 or return the operating lever 25. As a result of these operations, the relay valve piston 42 returns upward because the hydraulic pressure acting on its upper surface decreases, first closing the atmospheric valve 44, and then controlling the front and rear of the power piston 40 in order to open the vacuum valve 43. In order to make the chamber 46 and the vacuum chamber 47 the same negative pressure again, the power piston 40, center rod 45, and hydraulic piston 41 are moved by the return spring 51.
Clutch release cylinder 5
The clutch returns to connect the engine and transmission 10 because the oil pressure applied thereto decreases. In the figure, 54 indicates a check valve, and 55 indicates an air cleaner. Although the diaphragm-type vacuum booster 4 is shown here, it may be a piston-type one, and the type is not critical.

〔Effect of the invention〕

As described above, since the present invention has a switching cylinder, the clutch can be operated not only from the driver's seat side where the master cylinder is installed, but also from the place where the auxiliary master cylinder is installed, such as the cargo bed side. Moreover, since a vacuum booster is installed between the switching cylinder and the clutch release cylinder,
The force required for operation is extremely light, reducing the burden on the operator when operating from the auxiliary master cylinder side, and the clutch control master cylinder and vacuum booster that the vehicle is originally equipped with can be used. In between, all that is required is to connect the switching cylinder to the clutch control auxiliary master cylinder that responds to the clutch lever, and the only additional hydraulic piping required is to connect the clutch control auxiliary cylinder and the switching cylinder. In addition, even if some problem occurs in the hydraulic piping that connects this auxiliary cylinder for clutch control and the switching cylinder, the switching cylinder will not be able to handle the two hydraulic pressures from the master cylinder for clutch control and the auxiliary master. Since one of the high pressure sides of the clutch is sent to the vacuum booster side, there is no problem with the master cylinder responding to the clutch pedal engaging and closing the clutch via the vacuum booster.

[Brief explanation of drawings]

FIG. 1 is a side view of an example of a specially equipped vehicle, FIG. 2 is a cutaway plan view of the same, and FIG. 3 is a hydraulic circuit diagram of an embodiment of the present invention. 1 is a master cylinder, 2 is an auxiliary master cylinder, 3 is a switching cylinder, and 4 is a vacuum booster.

Claims (1)

[Claims] 1. A clutch control master cylinder that responds to a clutch pedal located in the driver's seat of the vehicle;
An auxiliary master cylinder for clutch control that responds to the clutch lever located on the vehicle's cargo bed.
A remote control for specially equipped vehicles characterized in that it is connected to a vacuum booster for driving the clutch release cylinder via a switching cylinder that sends one of the high pressure sides of the two hydraulic inputs from these two cylinders to the output side. Clutch control device.