JP3761719B2 - Air suspension car emergency starter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air suspension vehicle emergency starting device having a drive shaft for both two rear wheels.
[0002]
[Prior art]
In the rear-wheel two-axis air suspension vehicle, there are a rear-shaft only drive shaft and a rear-wheel two-shaft drive shaft. The two rear wheel shafts, both of which are drive shafts, are equipped with an interaxle differential that transmits and transmits power to both the rear rear shaft, the rear front shaft, and the rear rear shaft.
[0003]
When slip (idling) occurs when the vehicle starts on an inclined road or uneven road, the air spring on the driven wheel side of the rear rear shaft is discharged if only the rear front shaft is the drive shaft. The technology for increasing the shaft weight of the drive shaft and running is provided in Japanese Utility Model Laid-Open No. 63-51806 and Japanese Utility Model Laid-Open No. 5-74917.
[0004]
[Problems to be solved by the invention]
The air suspension is controlled longitudinally, and the left and right sides are fixed with support beams, so it moves up and down at the same fulcrum with respect to the road surface input, and like a trunnion suspension car, it swings back and forth and left and right around the trunnion center. It is difficult to obtain dynamic movement, and only the front and rear shafts are drive shafts, and the rear and rear shafts are driven wheels, so the front utility shaft slips when starting on slopes and uneven roads with the above-mentioned public utility model technology. When (idling) occurs, it is possible to exhaust air from the air spring on the rear rear axle side and increase the rear front axle weight, but both rear axles are driven. When the rear rear wheel slips due to the posture of the vehicle body on an inclined road or an uneven road, the power is lost to the rear rear axle, which makes the starting and running performance poor.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide an air suspension vehicle emergency start device that improves the startability of a drive shaft vehicle with respect to two rear wheels.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a drive shaft to which power is transmitted via an interaxle differential for both the rear front shaft and the rear rear shaft, and a chassis is connected to each of the shafts via an air spring. And a two-wheel drive rear wheel drive vehicle equipped with an air supply / discharge valve for supplying and discharging operating air to and from the air spring, and supplying and discharging air to an air supply path to the air spring on the rear rear shaft side. A control valve is provided, a solenoid valve is connected to the exhaust side of the supply / exhaust control valve, and a switch that simultaneously operates the solenoid valve and the lock of the interaxle differential is provided. The air spring on the rear rear shaft side is discharged by the switch to increase the shaft weight of the rear front shaft, and at the same time, the interaxle diff is locked to transmit power to the rear front shaft. It is.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a rear front shaft, and reference numeral 2 denotes a rear rear shaft, and one end thereof is fixed to leaf springs 3 and 4 attached to a chassis 7 so as to be swingable in the vertical direction. Air springs 5 and 6 for supporting the chassis 7 are interposed between the other ends of the leaf springs 3 and 4 and the chassis 7. Reference numerals 8 and 9 denote wheels attached to the rear front shaft 1 and the rear rear shaft 2, respectively.
[0008]
The rear front shaft 1 and the rear rear shaft 2 are drive shafts to which power is transmitted through the interaxle differential 10 shown in FIG.
[0009]
The interaxle differential 10 transmits power to the rear rear shaft 2 through a through shaft 11 coupled to a bevel gear and a propeller shaft 12 connected to the through shaft 11 so as to be rotatable on the through shaft 11. A drive gear 13 that is supported by a shaft and a sleeve 14 that is provided on the through shaft 11 so as to be movable in the axial direction and that engages and disengages with the drive gear 13 is also engaged with the drive gear 13 to power the rear front shaft 1. It is of a well-known structure that transmits
[0010]
The operation of the sleeve 14 in the axial direction is performed by a shift fork of a known air shift unit by operating an interaxle diff lock switch 15 (see FIG. 3) described later.
[0011]
In view of this, the present invention has an air supply / discharge control valve 16 (cut valve or electromagnetic valve) in the air supply path to the air spring 6 on the rear rear shaft 2 side, as shown in FIG. An electromagnetic valve 17 is connected to the exhaust side of the supply / exhaust control valve 16, and an emergency switch 18 for operating the electromagnetic valve 17 and the interaxle differential 10 at the same time is provided. The interaxle differential lock switch 15 and the emergency switch 18 are installed in the cab so that the driver can operate them. The interaxle diff lock switch can be used alone as usual.
[0012]
Since the present invention has the structure as described above, when the wheel 9 of the rear rear axle 2 slips due to the posture of the vehicle body on an inclined road or uneven road, the electromagnetic valve 17 is operated by pressing the emergency switch 18. Thus, the exhaust side of the supply / discharge control valve 16 is communicated with the atmosphere, and the air of the air spring 6 on the rear rear shaft 2 side is discharged. As a result, the rear rear shaft 2 is extracted, and the axial weight of the rear front shaft 1 increases, so that the wheel 8 of the rear front shaft 1 becomes a weighted wheel.
[0013]
In the present invention, the emergency switch 18 is pressed to discharge air from the air spring 6 on the rear rear shaft 2 side, and at the same time, the interaxle differential 10 is locked to transmit power to the rear front shaft 1.
[0014]
Accordingly, the rear rear shaft 2 is extracted and the rear front shaft 1 is increased in weight so that the wheels 8 of the rear front shaft 1 become weighted wheels, thereby improving the ground contact of the wheels 8 of the rear front shaft 1 and at the same time. The power transmitted to the rear front shaft 1 by the lock of the axle differential 10 improves the starting and running performance when the wheel 9 of the rear rear shaft 2 slips.
[0015]
After the start and break, the emergency switch 18 is turned off by the driver to close the solenoid valve 17 and unlock the interaxle diff 10. In addition to this manual operation, the shift position and traveling speed of the vehicle can be detected by a sensor, and when the speed exceeds a predetermined speed, the solenoid valve 17 can be closed and the interaxle differential 10 can be unlocked.
[0016]
【The invention's effect】
As described above, according to the present invention, the air suspension vehicle having the drive shaft for both the rear wheels and the drive shaft has the advantage of improving the emergency startability while maintaining the conventional essential structure with a simple structure. .
[Brief description of the drawings]
FIG. 1 is a side view of a rear wheel biaxial air suspension. FIG. 2 is a cross-sectional view of an interaxle differential structure. FIG. 3 is a structural diagram of the present invention.
1 Rear front shaft 2 Rear rear shaft 3 Leaf spring 4 Leaf spring 5 Air spring 6 Air spring 7 Chassis 8 Wheel 9 Wheel 10 Interaxle differential 11 Through shaft 12 Propeller shaft 13 Drive gear 14 Sleeve 15 Interaxle differential lock switch 16 Supply / exhaust control Valve 17 Solenoid valve 18 Emergency switch

Claims (1)

Both the rear front shaft and the rear rear shaft are drive shafts to which power is transmitted via an interaxle differential, and a chassis is supported on each of the shafts via an air spring, and the air spring is operated with air. A rear-wheel two-shaft drive vehicle equipped with an air supply / discharge valve for supplying / discharging air, provided with an air supply / discharge control valve in an air supply path to the air spring on the rear rear shaft side. A solenoid valve is connected to the exhaust side, and a switch that operates the solenoid valve and the lock of the interaxle differential at the same time is provided. When the rear rear wheel slips, the air spring of the rear rear axle is moved by the switch. The air suspension vehicle emergency start device is characterized in that the axle load of the rear front axle is increased and the interaxle diff is locked to transmit power to the rear front axle.

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