JPH0542817U - Counter Shaft Brake Protector - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if an abnormal signal is generated from the control unit, the brake is not actuated except when the counter shaft is turning by inertia, and the counter shaft brake protection device prevents damage to the brake mechanism. I will provide a. [Structure] A protection circuit 12 is provided which validates a control signal from a control unit 11 only when the clutch 2 is disengaged and the gear position is not in any gear stage.
Even if the control unit 11 is out of order, the clutch will turn off.
Even if the counter shaft 4 is requested to be braked in the N state or when the gear is in any gear, the braking means of the counter shaft 4 is not activated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a protective device for a counter shaft brake used in a transmission.

[0002]

[Prior Art]

 Conventionally, as shown in, for example, Japanese Patent Laid-Open No. 62-1647, a counter is used when shifting from a low speed gear to a high speed gear, or when shifting from a stopped state to a non-synchronous gear (first speed or reverse gear). A braking device is known in which the rotation of the shaft is forcibly reduced and a smooth gear change is performed to reduce gear noise.

Originally, this countershaft brake is used only when the clutch is in the disengaged state and the gear is in the neutral position. In recent years, this operating timing is controlled by the control unit. There are many. That is, the braking condition is determined by the control unit based on the clutch position, the gear position of the speed changer, etc., and the braking means of the counter shaft is electronically controlled by the control signal from the control unit.

[0004]

[Problems to be solved by the device]

 However, if for some reason a braking command from the control unit is issued under a condition other than the above conditions (when the clutch is ON or the gear position is set to any gear), the counter shaft will Even though the power was transmitted, the brakes would be applied, and the brake mechanism itself could be destroyed.

Therefore, in the present invention, even when an abnormal signal is generated from the control unit, when the power can be transmitted from the engine and / or the wheel side to the counter shaft, the brake is not operated and the brake mechanism is not activated. It is an object of the present invention to provide a protective device for a counter shaft brake that can prevent damage to the shaft.

[0006]

[Means for Solving the Problems]

 Therefore, the gist of the present invention is to provide a braking means for energizing the counter shaft of the transmission to forcibly reduce the rotation of the shaft and a braking timing of the counter shaft by the breaking means. It has a control unit for controlling, and a protective circuit is provided to validate the signal from the control unit to the braking means when the clutch is disengaged and the gear position is not in any gear stage. ..

[0007]

[Action]

 Therefore, while the control unit determines the braking timing of the counter shaft and outputs the control signal to the braking means, it is valid only when the protection circuit disengages the clutch and the gear is in the neutral position. Therefore, even if the control signal for braking is output due to the failure of the control unit and the clutch is ON, or the gear is in one of the gear stages, the brake means will not operate. Therefore, the above problems can be achieved.

[0008]

【Example】

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

In FIG. 1, an output shaft 1 of an engine is connected to an axle via a clutch 2 and a transmission 3, and a transmission 3 has a counter shaft 4 parallel to the output shaft 1. It is provided.

The counter shaft brake has, for example, a brake disc (not shown) fitted to the end of the counter shaft 4, and an actuator 5 having a piston 6 for applying a braking pressure to the brake disc. The pressure fluid from the pressure source 8 supplied to the cylinder 7 of No. 5 is adjusted by the solenoid valve 9 to control the rotation of the counter shaft 4.

When a control signal for requesting braking is added to the solenoid valve 9, the pressure fluid from the pressure source 8 is supplied into the cylinder 7, the piston 6 moves in the direction indicated by the solid arrow, and the brake disc is braked. The pressure is applied, and the rotation of the counter shaft 4 is forcibly reduced. Further, when the control signal for requesting the braking is not added to the solenoid valve 9, the solenoid valve 9 is switched as shown in the figure, the pressure fluid supplied in the cylinder is released to the tank 10, and the piston 6 is released. It moves in the direction indicated by the broken line arrow, and the braking of the counter shaft 4 is released.

The control signal for requesting the braking is output from the control unit 11. The control unit 11 has a known structure including an input port, an output port, a central processing unit (CPU), a ROM, a RAM and the like. Then, the clutch position signal, the gear position signal, etc. are input and the control shown in FIGS. 2 and 3 is executed.

FIG. 2 shows an example of control operation when shifting from the stopped state to the non-synchro gear (first speed or reverse gear). In step 50, the control unit 11 disengages the clutch 2 (OFF state). In step 52, a request signal for turning on the counter shaft brake is output to the solenoid valve 9.

When the counter shaft 4 is completely stopped, it may be difficult to set the gear rather. Therefore, in step 54, the rotation speed N of the counter shaft 4 is detected, and in step 56, this rotation speed N is detected. Is determined to be equal to or lower than the predetermined rotation speed Nk, and when the rotation speed N becomes equal to or lower than the predetermined rotation speed Nk, the routine proceeds to step 58, where the counter shaft brake is turned off, and at step 60, the gear change Set machine 3 to non-synchro gear.

Here, the predetermined rotation speed Nk is a value corresponding to a low rotation range, and is, for example, about 150 to 200 rpm when converted into engine rotation.

On the other hand, FIG. 3 shows an example of the control operation in the case of upshifting, and the control unit 11 turns off the clutch 2 (step 62) when there is a request for upshifting, and the gears. Is set to the neutral position and a request signal for turning on the counter shaft brake is output to the solenoid valve (steps 64 and 66).

In step 68, the rotation speed N of the counter shaft 4 is detected, and in step 70, it is determined whether or not this rotation speed N is less than or equal to a predetermined rotation speed Ng. At step 72, the process proceeds to step 72, the counter shaft brake is turned off, and at step 74, the transmission 3 is set to the gear one step higher.

Here, Ng is a value determined by the vehicle speed at the time of gear switching and the gear stage to be put in, and is the number of revolutions at which the gear stage can be smoothly switched without causing gear noise.

The protection circuit 12 is provided separately from the control unit 11, and has a clutch position determination unit 13 that determines that the clutch 2 is OFF and outputs a Hi signal, and the gear is in the neutral position. And a gear position determination unit 14 that outputs a Hi signal. The output terminals of the determination units 13 and 14 are input to the AND circuit 15, and the output terminal of the AND circuit 15 is an electromagnetic wave of the relay 16. It is directly connected to the coil 17.

The relay 16 is connected in series with the control line from the control unit 11 which is connected to the input terminal of the solenoid valve 9, and therefore the clutch 2 is in the disengaged state and the gear position is in any gear position. Only when it is not in the step (when it is in the neutral position), the electromagnetic coil 17 is energized, the contact 18 is closed, and the control signal from the control unit 11 becomes effective. In other cases, that is, the clutch 2 is turned on. If the gear position is in any of the gear stages, the contact 18 is opened and the control signal from the control unit 11 becomes invalid.

In the above configuration, when the control unit 11 is normal, the control request signal is output from the control unit 11 only when the clutch 2 is disengaged and the gear is in the neutral position. The output timing of the braking request signal and the output timing of the signal that closes the relay 16 via the AND circuit 15 match, and the control signal to the solenoid valve 9 becomes valid, so the pressure from the pressure source 8 Is supplied to the actuator 5 to apply braking to the counter shaft 4.

When a control signal for braking is output when the clutch 2 is turned on or the gear position is in any of the gear stages due to an abnormality in the control unit 11 for some reason, this signal is output. Since the timing is different from the output timing of the signal for closing the relay 16 via the AND circuit 15, the control signal from the control unit 11 is not transmitted to the solenoid valve 9. Therefore, it is possible to eliminate the possibility that the braking force is applied to the counter shaft 4 despite the power being transmitted from the axle 1.

[0023]

[Effect of the device]

 As described above, according to the present invention, the control circuit cuts off the clutch by the protection circuit, and the signal from the control unit is valid only when the gear is in the neutral position. Even if a braking request is made under other conditions due to a failure, the brake mechanism is not activated and damage to the braking mechanism can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a protection device for a counter shaft brake according to the present invention.

FIG. 2 is a flowchart showing an example of control operation when the control unit of FIG. 1 is put into a non-synchronous gear from a stopped state.

FIG. 3 is a flowchart showing an example of a shift-up control operation in the control unit of FIG.

[Explanation of symbols]

 2 clutch 3 transmission 4 counter shaft 5 actuator 8 pressure source 9 solenoid valve 11 control unit 12 protection circuit

Claims (1)

[Scope of utility model registration request] 1. A braking device for applying a braking force to a counter shaft of a transmission to forcibly reduce the rotation of the counter shaft, and a control unit for controlling the braking timing of the counter shaft by the braking device. However, the protection of the counter shaft brake is provided with a protection circuit for validating the signal from the control unit to the brake means when the clutch is disengaged and the gear position is not in any gear stage. apparatus.