JPS6053430A - Differential lock system for car - Google Patents

Abstract

PURPOSE:To improve the operability by functioning a differential lock system when the steering rotary angle is smaller than predetermined level while releasing function when it is larger than predetermined level. CONSTITUTION:If the handle is within predetermined range when the operating oil is pressure fed from a hydraulic pump 10 through the operating oil circulation system 9 in the arrow 27 direction and branched through a differential system 2A then fed to hydraulic motors 1a, 1b, the choking path 7 of differential lock system 5A is communicated through a controller 24 for receiving a steering angle detection signal to the differential system 2A. Said differential system 2A is employing a flow divider structure to feed equal amount of operating oil to both hydraulic motors 1a, 1b even if the loads on the left/right wheels are not equal thus to perform differential lock. Upon increase of steering angle, the communication path 6 of differential lock system 5A is communicated to the differ- ential system 2A to release differential lock.

Description

[Detailed description of the invention] The present invention relates to a differential lock device for a vehicle.

Conventionally, when activating or deactivating a vehicle's differential lock device, it has been common for the driver to use this name as needed; The problem is that the operation is not always deactivated.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to enable a differential lock device to be activated and deactivated reliably at appropriate timing without relying on the driver's operation.

In order to achieve this object, the present invention provides a differential lock device that can lock a differential device of a vehicle, and a differential lock device that can lock a differential device of a vehicle.
a detection device capable of detecting the above, and upon receiving a signal from the detection device, when the steering rotation angle is smaller than a certain value, actuating the differential lock device J described in (b);
The present invention further includes a control device that releases the operation of the differential lock device when the steering rotation angle is larger than a constant value.

Therefore, despite the difference in the load on the left and right wheels, the vehicle was driven straight (at the 8th turn, the de7 errential lock device was activated, and conversely, the steering rotation angle of the wheels was increased beyond a certain value). Since the differential lock device is deactivated when the vehicle is turned, the differential lock device can be reliably activated and deactivated at appropriate timings without any operation by the driver.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Fig. 1, (ta) and (lb) are a pair of hydraulic motors for driving the left and right wheels, and a pair of differentials for forward and backward movement! (2A) and (2B) are connected in parallel. Each differential gear 7-yel device 1 ton
(2A) and (2B) are constituted by a blow divider having a pair of throttles (3), and have a built-in check valve (4) for turning backflow into a free flow. Each differential gear 7 gear device (
A differential lock device (5A) (5B) is connected between the outlet ports on the branch side of both the throttles (31 (3)) of 2A) and 2B.
A) (5B) is composed of a switching valve having a communication passage (6) and a closing passage (7), and is driven by a solenoid (8).

(+51 is a hydraulic oil circulation system, which is connected to each differential gear system (2A) r2B) and is equipped with a variable displacement hydraulic pump αG that can control the front and rear of the vehicle and the running speed. (11) is a hydraulic oil replenishment device for the hydraulic oil circulation system (9), which includes a constant volume hydraulic pump (f12) and a pair of non-return checks connected to one and the other discharge port sides of the hydraulic pump (10). It has a valve α□□□ and an oil tank θ4). Diarrhea is caused by filtration and ri. A relief valve unit (l[i) is provided in the middle of the hydraulic oil circulation system (9), and a relief valve unit (l[i) is provided in the middle of the hydraulic oil circulation system (9), and a relief valve unit (l [i)
Relief valve θ9) heading from the pipe (18) to the pipe 0~
It has a relief valve (21J) that goes from the pipe to the pipe Qη.

FIG. 2 shows the handle device 1). This steering wheel device includes a steering wheel (2) (2) operated by the driver, a power steering unit, and a steering wheel turning angle detecting device (7) such as an angle sensor. (to) is a control device which receives a signal from the steering angle detection device and enables the solenoid (8) of the differential lock device (5A) (5B).

In other words, the handle (2) 1) is at the straight handle position position 0.
When the position is within the range (26) of about 30 degrees including
), and the handlebar 1) is connected to the certain range (2G
), and the steering rotation angle of the wheels becomes large, the communication passage (6) is connected to the differential device (2A
) (2B).

In the above configuration, the hydraulic oil from the hydraulic pump Q (m) is pumped through the oil circulation system (9), for example in the direction of the arrow, to i, and after being diverted by the differential device (2A),
Hydraulic motor (1fL) (1') via throttle (3) (3)
b).

Here, when the steering wheel (211 is located within a certain range (2), the differential gear lock device (5A)
The closed path (7) is communicated with the differential device (2 people), and the differential G fiJ (2
A) Since it is composed of a flow divider, this flow divider acts, even if the load on the left and right wheels, that is, the load on both hydraulic motors (la) and (lb), changes.
Equal amounts of hydraulic oil are supplied to both hydraulic motors (la) and (lb), and a differential lock is applied.

On the other hand, if the steering wheel (21+) is turned more than a certain range (2 points), the control device example connects the communication path (6) of the differential O/1FF (5A) to the differential device (2 persons). As a result, the outlet ports of both throttles (31(3)) of the differential device (2A) are communicated with each other, and they no longer function as a blow divider.

Therefore, if the loads applied to the left and right wheels are different, more hydraulic oil will flow to the hydraulic motor [1a) or (1b) of the wheel with the smaller load, and the differential lock will be released and the differential device (2 people) will be operated normally. It will affect.

The hydraulic oil that exits the hydraulic motor (la) (lb) passes through the check valve (4) of the differential device (2B) and then flows through the valve.
Returns to the hydraulic pump + ICI via the hydraulic oil circulation system (9).

When reversing the direction of travel of the vehicle, use a hydraulic pump (1 (l)
Shake it in reverse. Then, the first oil flows in the opposite direction to the direction of the arrow (b), and flows through the differential device (2B), the hydraulic motors (la) (lb), and the differential device (2).
person) in this order, and a differential function is provided by the differential device (2B).

When the accelerator pedal is suddenly removed or the brakes are applied suddenly, the relief valve unit (061) is activated to prevent harmful high pressure from occurring within the system.

In addition, the hydraulic oil replenishment device (II) is used to replenish hydraulic oil into the system.
Published as appropriate.

In addition, in the above, a steering wheel turning angle detection device aI23) is used as a device for detecting an amount corresponding to the steering rotation angle of the wheel, but in addition to this, a device that directly detects the eastward rotation angle of the wheel is used. It is also possible to use a device that detects the distance of the steering rod.

As mentioned above, according to Kinema, when the vehicle wants to go straight despite the difference in the Q loads on the left and right axles, the differential lock device prompts 1, and conversely, the steering rotation of the wheels is activated. If you want to turn the vehicle by increasing the angle beyond a certain value, the operation of the differential lock device will be canceled, so it is necessary to activate the differential lock device and release the lock as appropriate without the driver's operation. You can do it in a timely manner.

[Brief explanation of the drawing]

FIG. 1 is a hydraulic circuit diagram showing one embodiment of the present invention, and FIG. 2 is a perspective view showing a handle device. (la) (1b), , hydraulic motor, (2)) (2B)
-・-Different tire device, (3)...Aperture, (4
)...Check valve, (5A) (5B)...Differential lock device t, (6)...Communication path, (7)...
・Occluded path, (231...handle turning angle detection device),
(24)...Control device agent Yoshihiro Morimoto

Claims (1)

[Claims] LJj iR is a differential lock that can lock the vehicle's differential system (r=:), a detection device that can detect an amount according to the steering rotation angle of the wheels, such as the steering wheel turning angle, and a signal from this detection device. and when the steering rotation angle is smaller than a certain value, the differential lock device is activated, and when the steering rotation angle is larger than the certain value '-/'h AQ, the differential lock device is activated. 7. A differential locking device for a vehicle, comprising a control device for releasing the operation-I.