JPS61125927A - Automatic clutch device - Google Patents

Abstract

PURPOSE:To make creep driving performable in an automatic clutch device, by installing a creep mode switch which makes a clutch continue such a state that it meets as being slipped. CONSTITUTION:When a creep mode to come into a state of being turned on, a solenoid valve 5 delivers intermittently pulse-form air by a command out of a control circuit, whereby an actuator 6 is operated. In this case, a clutch disc comes into contact with a flywheel of revolving engine as being slipped, and weak torque is transmitted there. If a driver loosens a brake, his car runs slowly.When the driver operates a creep value adjusting switch 11, a cycle of air fed out of the solenoid valve 5 gets varied so that the actuator 6 varies slippage in the case where a clutch meets.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic clutch device for automobiles and other vehicles in which the engaging operation of a disc type clutch is performed by electrical program control.

[Conventional technology]

A method is known in which the engagement operation of a disc type clutch is mechanically operated by an actuator via a servo mechanism, and the servo mechanism sends output information, that is, an electric signal, from a control circuit including a microprocessor to perform program control. It is being

FIG. 4 shows a block diagram of a conventional structure.

The release fork 21 is driven by the actuator 6, and is driven by the pressure plate 22 and the clutch disc 2.
3, the torque of the flywheel 24 of the engine is transmitted to or released from the input shaft 25 of the transmission gear section. The actuator 6 is actuated by the delivery of pressurized air from the solenoid valve 5, and the excitation operation of the solenoid valve 5 is performed by a program in the control circuit 4.

This disc-type automatic clutch device does not cause slippage due to the kinematic viscosity of the fluid compared to fluid coupling-type automatic clutch devices, so it is more fuel efficient during high-speed operation, and the configuration is different from that of conventional manual clutch devices. Since it has already been used in cars equipped with a clutch, it has the advantage of being easy to handle and maintain.

[Problem that the invention seeks to solve]

However, in vehicles equipped with fluid coupling, if the gear shift lever is set to drive range and the brake is released while the engine is idling, the vehicle will run at a slow speed. In other words, the stopping position can be finely adjusted just by operating the brake pedal, which is very convenient when parking the vehicle in a garage. Vehicles equipped with a disc-type automatic clutch cannot perform the above-mentioned creep operation in which only the brake pedal is operated.
Not only is it cumbersome for the driver to switch between pressing the accelerator and brake pedals when parking the car, etc.
If this operation is continued, there is a problem in that the clutch disk generates heat.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic clutch device that can perform creep operation in a vehicle equipped with a disc-type clutch type automatic clutch device and suppresses heat generation of the clutch disk.

[Means for solving problems]

The present invention includes a disc-type clutch, a program control circuit that receives information on the rotational speed of the engine and sends out output information for controlling the connection state of the clutch, and a machine that automatically controls the state of the clutch in accordance with the output information of the control circuit. In the automatic clutch device, a creep mode switch connected to the control circuit is provided at a position where the driver can operate the clutch, and the control circuit is configured to control the creep mode when the creep mode switch is in the on state. , the disc-type clutch is characterized in that it is a wet clutch in which oil is supplied to the contact surfaces, including a control means for controlling the clutch to continue in a state of contact while slipping.

[For production]

When the driver operates the creep mode switch, the control circuit causes the clutch to continue to slip and engage. In this state, pressing the brake pedal will stop the vehicle.
If you release the pre- and -key pedals, the vehicle will run at a slow speed. If the leap mode operation continues as described above, the clutch disk generates heat, so this is cooled down by forced oil supply.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of the main parts of the above embodiment. The engine 1, the clutch section 2, and the transmission gear section 3 are a disk-type clutch type power unit, and the speed sensor IA is connected to the control circuit 4.
The control circuit 4 inputs the rotational speed of the engine 1 into a preset program, applies output information to the solenoid valve 5 via the input/output interface 9, and drives the actuator 6 to control the clutch in the clutch section 2. control the connection state of Vehicle speed information from the speedometer 8 is input to the control circuit 4.

The feature of the present invention is that a creep mode switch 10 is provided, and when the driver operates this, the clutch is controlled to continue to slip and engage regardless of the operation of the accelerator pedal. . Furthermore, the clutch unit 2 is characterized by a structure in which a forced lubrication wet clutch is used and its disk is cooled. Creep mode switch 10, creep amount adjustment switch 11
is located in a position that is easy for the driver to operate. Further, the creep mode switch 10 is configured to be automatically reset by the activation of an accelerator detection switch 12 that is activated when the accelerator pedal 7A is depressed or a handbrake detection switch 13 that detects the operation of the handbrake 7B. ing.

In Figure 1, when the driver performs creep operation,
When the creep mode switch 10 is turned on, the solenoid valve 5 sends out intermittent pulsed air according to a command from the control circuit 4, which activates the actuator 6. In this case, as shown in FIG. disk 23
slides into contact with the rotating flywheel 24 of the engine, and a weak torque is transmitted to the input shaft 25. If the driver releases the brakes, the vehicle will run at a slow speed. In this case, if the load is heavy or if the driver wants to slightly adjust the running speed on an uphill slope, the driver operates the creep amount adjustment switch 11 to change the cycle of pulsed air sent out from the solenoid valve 5. The actuator 6 changes the amount of creep, that is, the amount of slip when the clutch is engaged, so that the vehicle speed is adjusted.

To end creep operation and drive the vehicle normally, press the accelerator pedal 7A and the accelerator detection switch 12
The creep mode switch 10 is automatically turned off. When the vehicle is to be stopped, the creep mode switch 10 is automatically turned off by the handbrake detection switch 13 by operating the handbrake 7B.

The driver can also manually turn off the creep mode switch IO.

The flow of forced lubricating oil supply in a wet clutch will be explained with reference to FIG. The lubricating oil 26 accumulated at the bottom of the clutch portion 2 communicates with a chamber 28A of an oil pump 28 through a pipe 27. The oil pump 28 is operated by a gear 28B, and pumps up the lubricating oil 26 through the chambers 28A, 28G and piping 29 to an oil tank 30, where it is cooled.
It is made to flow down around the input shaft 25 via piping 31 and 32. Since the input shaft 25 is rotating, the lubricating oil that has flowed down is shaken off and spouted from the oil discharge port 33.

These sprayed oil droplets force the pressure plate 22, clutch disk 23, and intermediate pressure plate 34 into an oil bath, so even if creep operation continues, temperature rise due to clutch sliding friction is suppressed, and the clutch portion is deformed. and deterioration can be prevented.

In this embodiment, the amount of creep is adjusted by changing the cycle of pulsed air that is intermittently sent out by the solenoid valve 5, but a plurality of solenoid valves with different pressure regulation values are used. Alternatively, it may be implemented using a variable pressure solenoid valve whose delivery pressure is changed by changing the energizing current of the solenoid valve.

In addition to the potentiometer type creep amount adjustment switch, a non-contact type differential transformer or a terminal changeover switch may also be used.

Another embodiment of the invention is shown in FIG.

This embodiment is an embodiment in which a wet clutch type with an oil pump is not adopted due to insufficient space in the clutch section. In FIG. 3, the solenoid valve 35 is connected to the injector 3.
6 is intermittently supplied with pressurized air. The injector 36 is attached to the side wall of the clutch portion 2, and internal lubricating oil is collected near the injector nozzle. When the electromagnetic valve 35 is energized and pressurized air is sent to the injector 36 and ejected from the nozzle, the lubricating oil near the nozzle is ejected into the interior through the side wall of the clutch section 2 by the pipe 37, and is sprayed into the clutch disk and pressure plate (not shown). sprayed on the air to provide a cooling effect.

〔Effect of the invention〕

By carrying out the present invention, it is possible to perform creep operation even in a program-controlled automatic clutch device having a disk type clutch having the advantages described above, and also to suppress heat generation of the clutch and continuously perform creep operation. It has the effect of making it possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional structural view of the main part of the clutch section of the above embodiment device. FIG. 3 is an explanatory diagram of a method of forcibly lubricating a clutch portion according to another embodiment of the present invention. FIG. 4 is a block diagram of a conventional structure. DESCRIPTION OF SYMBOLS 1... Engine, IA... Speed sensor, 2... Clutch part, 3... Transmission gear part, 4... Control circuit, 5
．． 35... Solenoid valve, 6... Actuator, 7A.
・・Accelerator pedal, 7B・Handbrake, 8・
...Speedometer, 9...Person output interface, 10...
・Creep mode switch, 11... Creep amount adjustment switch, 12... Accelerator detection switch, 13...
・Handbrake detection switch, 21... Release fork, 22... Pressure plate, 23... Clutch disc, 24... Flywheel, 25...
・Input shaft, 26...Lubricating oil, 27.29
．． 31.32.37...Piping, 28...Oil pump,
28A, 28C...chamber, 28B...oil pump gear,
30...Oil tank, 33...Oil discharge port, 34.
...Intermediate pressure plate, 36...Injector. Patent Applicant Hino Motors Co., Ltd. Agent Patent Attorney Nao Ide Takashi Tsuta 1 Illustration 20

Claims (1)

[Claims] (1) A disc-type clutch, a program control circuit that receives engine rotational speed information as input and sends out output information that controls the connection state of the clutch, and mechanically controls the state of the clutch according to the output information of this control circuit. The automatic clutch device is equipped with a creep mode switch connected to the control circuit at a position that can be operated by the driver, and the control circuit is configured to control the creep mode when the creep mode switch is in the on state. An automatic clutch device comprising a control means for controlling the clutch to maintain a state of contact while slipping, and characterized in that the disc-type clutch is a wet clutch whose contact surfaces are supplied with oil.