JPH0314415Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a differential control device for a vehicle equipped with a differential lock. More specifically, the present invention relates to a device for automatically canceling the operation of a differential lock under predetermined driving conditions.

[Conventional technology]

Conventionally, vehicles equipped with a differential lock include, in addition to a transmission, a transfer that can distribute the drive output to a predetermined one or both of the front axle or rear axle, and a switching means such as a select lever or a select switch button. By operating this, the transfer is alternately switched between two-wheel drive and four-wheel drive. A differential lock means is provided on a predetermined one of the front axle or the rear axle, and the differential provided on the predetermined axle can be locked by turning on the deflock switch. When a vehicle with a differential lock gets stuck on a rough road such as a muddy ground, it switches to four-wheel drive using the switching means, operates the differential lock means, and rotates the left and right wheels at the same rate without differential rotation. It provides the same driving force to the wheels to escape from rough roads.

[Problem that the invention attempts to solve]

However, in conventional vehicles equipped with a differential lock, the unlocking of the differential lock is done at the discretion of the driver, so if the driver inadvertently continues driving with the differential engaged after driving off a rough road, Even if there is a difference in the rotational resistance between the left and right wheels, the left and right wheels rotate at the same rate, so this difference appears as slippage with the road surface, putting strain on the differential gear, drive shaft, tires, etc., and worsening the stability of steering. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a differential lock control device that releases the locking operation of a differential lock means under predetermined driving conditions, reduces the load on the drive system of a vehicle equipped with a differential lock, and prevents deterioration of steering stability. .

[Means for solving problems]

The configuration of the present invention for achieving the above object will be explained based on figures corresponding to embodiments.

The differential lock control device of the present invention includes a transfer 13 that can distribute the drive output of a vehicle transmission 11 to a predetermined one or both of a front axle 16 and a rear axle 15, and a transfer 13 that operates the transfer 13. switching means 17 for alternately switching the drive system of the vehicle between two-wheel drive and four-wheel drive;
and a differential lock means 20 that locks a predetermined one of the front differential 18 or the rear differential 19 by operating a differential switch 29, the gear position of the transmission 11 is changed to first gear or reverse gear. The vehicle includes a shift switch 27 that is turned on when the vehicle is shifted to four-wheel drive, and a select switch 28 that is turned on when the switching means 17 switches the drive system of the vehicle to four-wheel drive. The deflock means 20 is constructed so that it does not perform a locking operation when either the shift switch 27 or the select switch 28 is in the OFF state.

[Effect]

When the vehicle enters a rough road, the driver activates the switching means 17.
After switching the vehicle's drive system to four-wheel drive and turning on the differential gear switch 29, when the transmission gear position is shifted to first gear or reverse gear, the differential gear 20 is activated and the driving force is uniformly applied to all wheels. This allows the vehicle to escape from the rough road.

Here, even if the driver forgets to turn off the deflock switch 29 and attempts to drive with the defroc locked, the driver must either shift up the transmission gear position to second gear or higher, or switch the vehicle's drive system back to two-wheel drive. If so, the defroc means 20 will not operate even if the defroc switch 29 remains on.

〔Example〕

Next, one embodiment of the present invention will be described in detail based on the drawings.

In the figure, this example is a vehicle with a front differential lock. The output shaft of the transmission 11 of the engine 10 is connected to the transfer 1 via a small propeller shaft 12.
Connect to 3. The transfer force 13 transfers the drive output of the transmission 11 to the rear axle 15 or the rear axle 1.
5 and the front axle 16.

This transfer 13 is provided with a select lever 17 for connecting and disconnecting the clutch. The select lever 17 connects and disconnects the drive system of the vehicle by switching the lever to two-wheel drive (rear-wheel drive).
It can be switched alternately from to four-wheel drive or vice versa.

A lock unit 20 for locking the front differential 18 is attached to the front axle 16.
An air pipe line 21 is connected to this unit 20. The air pipe line 21 is connected to an air tank 23 with a solenoid valve 22 interposed therebetween. A battery 26 is connected to one electrical contact of the solenoid valve 22 via a key switch 25, and a shift switch 27, a select switch 28, and a defroster switch 29 are connected in series to the other electrical contact of the solenoid valve 22. . The shift switch 27 is a detection switch that is turned on when the gear position of the transmission 11 is shifted to the first gear or the reverse gear. The select switch 28 is a detection switch that is turned on when the select lever 17 switches the drive system of the vehicle to four-wheel drive.

In a device with such a configuration, when the vehicle enters a rough road, the driver operates the select lever 17 to switch the vehicle's drive system to four-wheel drive, turns on the differential switch 29, and then switches the gear of the transmission 11. When the position is shifted to first gear or reverse gear, the key switch 25, shift switch 27, and select switch 2
Since the lock unit 8 and the defroc switch 29 are all turned on, the solenoid valve 22 opens and air flows into the lock unit 20 from the air tank 23. As a result, the front differential 18 is locked and driving force is uniformly transmitted to all four wheels, allowing the vehicle to escape from the rough road.

Here, even if the driver forgets to turn off the deflock switch 29 and attempts to drive with the defroc locked, the driver must either shift up the transmission gear position to second gear or higher, or switch the vehicle's drive system back to two-wheel drive. If so, the shift switch 27 or the select switch 28 is turned off, so that no current flows through the solenoid valve 22, and the solenoid valve 22 closes to release the air in the air pipe 21. This prevents air from flowing into the lock unit 20 even if the differential switch 29 remains on, and the front differential 18 is automatically unlocked. Furthermore, even if the driver accidentally turns on the differential lock switch 29 during normal driving on roads other than rough roads, the lock unit 20 will not operate unless the shift switch 27 and select switch 28 are both in the ON state.
There is no defrot locking.

Note that the operating circuit of the electromagnetic valve 22 shown in the above example is one example, and the present invention is not limited to this.

Further, although an example has been shown in which the select lever 17 is used as a switching means for the transfer 13, if an electrically switching switch button is provided, the select switch 28 may also be used as a switch button.

[Effects of the invention] As described above, according to the invention, even if the driver turns on the defrot switch when there is no true need for the defrot to operate, the lock of the defroc means is prevented from automatically operating. As a result, there is no unnecessary burden on the drive system of the vehicle with the differential lock, such as the differential device, drive shaft, tires, etc., and there is an excellent effect of preventing deterioration of the maneuverability of the vehicle with the differential lock.

[Brief explanation of the drawing]

The figure is a configuration diagram of a control device according to an embodiment of the present invention. 11...Transmission, 13...Transfer, 15
...Rear axle, 16...Front axle,
17...Select lever (switching means), 18...
Front differential, 19... Rear differential, 20... Lock unit (deflock means), 27... Shift switch, 28... Select switch, 29...
Defrot switch.

Claims (1)

[Claims for Utility Model Registration] A transfer that can distribute the drive output of a vehicle transmission to a predetermined one or both of a front axle or a rear axle, and a drive of the vehicle by operating this transfer. In a vehicle equipped with a differential lock, the vehicle is equipped with a switching means for alternately switching the system between two-wheel drive and four-wheel drive, and a differential locking means for locking a predetermined one of a front differential or a rear differential by switching a differential switch. a shift switch that is turned on when the gear position of the vehicle is shifted to first gear or reverse gear, and a select switch that is turned on when the switching means switches the drive system of the vehicle to four-wheel drive. . A deflock control device, characterized in that said deflock means is constructed so as not to perform a locking operation when either said shift switch or said select switch is in an OFF state.