JPH0525986Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a vehicle equipped with a rear wheel steering mechanism, such as an all-terrain crane carrier, which warns when the rear wheels are unlocked when traveling at high speed. This invention relates to a lock warning device for a rear wheel steering device.

[Prior art]

Vehicles such as all-terrain crane carriers are
Power cylinders are attached to each of the front and rear wheels, and the vehicle is configured to perform front wheel steering, front wheel rear wheel steering, and crab foot steering, and is equipped with a locking mechanism that locks rear wheel steering during high speed driving. Vehicles with such a configuration are often used as crane vehicles and the like because the rear wheels are steered in accordance with the front wheels at a work site, improving maneuverability in narrow spaces. By the way, since such vehicles also travel at high speeds on general roads, unlike in narrow areas such as work sites, a locking mechanism is activated to lock rear wheel steering in order to ensure that the rear wheels go straight.

[Problem that the invention attempts to solve]

However, in the vehicle rear wheel steering device with the above configuration, even if the driver forgets to activate the lock mechanism when driving at high speed, or if the lock mechanism becomes inoperable for some reason, there is a problem with the driver not being able to operate the lock mechanism. Because there is no known means, if the lock is released and you drive at high speed without ensuring the rear wheels go straight, there is a risk that the vehicle will go straight at an angle or that you will not be able to turn right or left. However, there was a problem in that the driver could not be informed of this fact.

The present invention has been made in view of the above points, and is intended for use in vehicle steering devices such as all-terrain crane carriers that are configured to perform front wheel steering, front wheel rear wheel steering, and crab foot steering when driving at high speeds. To provide a rear wheel steering lock warning device for a vehicle, which detects when a vehicle runs at high speed without locking the wheel steering and gives a warning to a driver, etc.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention, as shown in FIGS. 1 and 2, installs power cylinders 3 and 4 on the front and rear wheels 1 and 2 of an all-terrain crane carrier, etc., respectively, and steers the front wheels. It is configured to allow front and rear wheel steering and crab foot steering.
In a vehicle rear wheel steering device, the vehicle rear wheel steering device is provided with a lock mechanism 10 for locking the rear wheel steering, and a means for turning off the pattern shift relay 31 while the lock mechanism 10 is locked to disable rear wheel steering. Sub-transmission detection switches 23-1 and 23-2 for detecting the shift state of the transmission and unlocking detection switches 18 and 19 for the lock mechanism 10 are provided, and the sub-transmission is set to a low gear (switch 23-2).
-2 is ON), the lock release detection switch 18 is
When it is ON, the lock is released and the auxiliary transmission is in high gear (switch 23-1 is ON) and lock detection switch 2 is activated.
A lock release alarm lamp 21 and a lock release alarm buzzer 2 that issue an alarm when the lock is not detected.
2 and a lock emergency switch 30. When the pattern shift relay 31 is turned OFF while the lock mechanism 10 is locked and the rear wheels 1 and 2 cannot be steered, by turning on the lock emergency switch 30, During the ON operation, the power cylinders 3 and 4 are expanded and contracted to enable rear wheel steering, thereby configuring a vehicle rear wheel steering lock warning device.

[Effect]

By configuring the vehicle rear wheel steering lock warning device as described above, when the sub-transmission is in a high gear and the lock detection switch does not detect lock,
That is, when the vehicle is traveling at high speed and the rear wheel steering is not locked, it is possible to issue an alarm to warn the driver and the like.

In addition, if you want to make fine adjustments to the straight-ahead state of the rear wheels when the lock mechanism is locked and the pattern shift relay is OFF and the rear wheels cannot be steered, you can turn the lock emergency switch ON regardless of the lock state. It enables rear wheel steering and allows fine adjustment of the straight-ahead state of the rear wheels.

〔Example〕

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

FIG. 1 is a system diagram showing the system configuration of a vehicle rear wheel steering lock warning device according to the present invention. In the same figure, thick solid lines indicate pneumatic piping,
The dashed-dotted line indicates electrical wiring. Reference numeral 10 denotes a lock portion for locking the steering of the rear wheels. The lock portion 10 is composed of a lock bracket 11, a lock lever 12, and a lock pin 13. The lock bracket 11 is formed with a through groove through which the lock lever 12 passes. Further, lock holes 11a and 12a are formed in each of the lock bracket 11 and the lock lever 12, into which a lock pin 13 is inserted.
The lock for rear wheel steering is the lock hole 12a of the lock lever 12 and the lock hole 11a of the lock bracket 11.
This is done by lowering the lock pin 13 and inserting it into the lock holes 11a and 12a.

14 is a piston connected to a lock pin;
5 is an air cylinder that moves the piston 14 up and down, and 16 is a return spring that returns the lock pin. 17 sends compressed air to the air cylinder 15 or
When the pneumatic switching valve 17 is switched in the direction of arrow A, compressed air is supplied from the compressed air source to the air cylinder 15, and when switched in the direction of arrow B, compressed air is released into the atmosphere. be done.

Numerals 18 and 19 are lock release detection switches for detecting lock release, 20 is a lock detection switch for detecting a lock state, 21 is a lock release warning lamp for warning of lock release, 22 is a lock release warning buzzer for warning of lock release, 23 -1 is an auxiliary transmission detection switch for detecting the high speed of the auxiliary transmission; 23;
-2 is an auxiliary transmission detection switch that detects the low speed of the auxiliary transmission; 24 is a lock warning relay; 25 is a lock release relay; 26 is a lock release switch that releases the lock of the lock section 10; 27 is a lock position relay , 28 is a lock position detection switch, 2
9 is a lock position indicator lamp.

In the vehicle rear wheel steering lock warning system having the above structure, the following operations are performed for unlocking and locking.

When releasing the lock: When the vehicle is stopped and the sub-transmission is switched to the low speed side, the sub-transmission detection switch 23-2 is turned on, and the lock release relay 25 is turned on. When the lock release switch 26 is turned on in this state, the air pressure switching valve 17 is transferred from the battery E through the contacts of the lock release switch 26 and the lock release relay 25.
Current is supplied to the actuating coil 17a, and the pneumatic switching valve 17 is switched to the arrow A side. This results in
Compressed air is supplied from the compressed air source to the air cylinder 15, the piston 14 rises, and the lock pin 13
is pulled up, and the lock portion 10 is unlocked. As a result, the lock detection switch 20 for detecting lock release is turned on, and current is supplied from the battery E to the lock release alarm lamp 21, which lights up.

When locking: The lock position detection switch 28 detects whether the rear wheels are in the lock position. When unlocking,
Since the lock release detection switch 18 is ON,
The lock position relay 27 is ON, and when the rear wheel is set to the lock position in this state, the lock position detection switch 28 is turned ON, and the lock position display lamp 29, the contact point of the lock position relay 27, and the lock position are detected from the battery E. A current flows through the detection switch 28 and the lock position indicator lamp 29 lights up. In this state, press the lock release switch 26.
When turned OFF, air pressure switching valve 1 is switched from battery E.
The operating current supplied to the operating coil 17a of No. 7 is cut off, and the pneumatic switching valve 17 is switched to the arrow B side. As a result, the compressed air in the air cylinder 15 is released into the atmosphere, and the lock pin 13 is lowered in conjunction with the piston 14 by the spring force of the return spring 16, and the lock pin 13 is inserted into the lock holes 11a and 12a of the lock bracket 11 and lock lever 12. is inserted. When the lock is completely locked, the lock detection switch 20 is turned off and the lock release warning lamp 21 is turned off, confirming that the lock is completely locked.

If you attempt to drive at high speed without locking the rear wheel steering and manage to switch the auxiliary transmission to the high speed side,
Since the sub-transmission detection switch 23-1 is turned on and the lock pin 13 has come out of the lock holes 11a and 12a of the lock bracket 11 and lock lever 12, the lock detection switch 20 is turned on and the lock alarm buzzer 22 sounds.

In addition, 30 is a lock emergency switch, and when making fine adjustments to the straight-ahead state of the rear wheels in order to lock the rear wheel steering, the pattern shift relay 31 is activated since the lock release detection switch 19 is OFF. Although it is OFF and the rear wheels cannot be steered, by operating the lock emergency switch 30, the rear wheels can be steered regardless of the lock state. However, the lock emergency switch 30 automatically returns to OFF.
Therefore, the lock emergency switch 3
The above-mentioned steering is possible only during the 0 operation.

Figures 2a and 2b are diagrams showing the structure of the rear wheel on which the rear wheel steering lock device shown in Figure 1 is mounted, with figure a being a plan view and figure b being seen from the direction of arrow C in figure a It is a diagram. As shown in the figure, power cylinders 3 and 4 are connected to the steering knuckles 5 and 6 of the rear wheels 1 and 2, and by expanding and contracting the power cylinders 3 and 4, the direction of the rear wheels 1 and 2 can be changed. I can do it. One end of the lock lever 12 is connected to the steering knuckle 5, and the lock lever 12 passes through the through groove of the lock bracket 11 to the opposite side as described above. An air cylinder 15 is fixed to the upper part of the lock bracket 11, and a lock pin 13 supported by the piston 14 as described above is arranged at the lower part of the air cylinder 15.

[Effect of idea]

As explained above, the vehicle rear wheel steering lock warning device according to the present invention is effective when the auxiliary transmission is in a high gear and the lock detection switch does not detect lock, that is, when the vehicle is traveling at high speed and the rear wheel steering is not locked. An alarm will be issued to alert the driver, etc., so if the lock is released and the rear wheels are not able to maintain straight-line driving and the vehicle is driven at high speed, the driver will be notified and the vehicle will not continue to drive straight at an angle. This has an extremely excellent effect of preventing the risk of not being able to turn right or left.

In addition, if you want to make fine adjustments to the straight-ahead state of the rear wheels when the lock mechanism is locked and the pattern shift relay is OFF and the rear wheels cannot be steered, you can turn the lock emergency switch ON regardless of the lock state. It also has the excellent effect of making it possible to steer the rear wheels and finely adjust the straight-ahead state of the rear wheels.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the system configuration of the vehicle rear wheel steering lock warning device according to the present invention, and Fig. 2 is a diagram showing the structure of the rear wheel on which the rear wheel steering lock device is mounted, and a in the figure is a plan view. Figure 1B is a view seen from the direction of arrow C in Figure A. In the figure, 10... Lock portion, 11... Lock bracket, 12... Lock lever, 13... Lock pin, 14... Piston, 15... Air cylinder, 16... Return spring, 17... Pneumatic switching valve, 18, 19... Lock release detection switch, 20... Lock detection switch, 21... Lock release warning lamp, 22... Lock release warning buzzer, 23-1, 23-2... Sub-transmission detection switch, 24... ...Lock alarm relay, 25...Lock release relay, 26...Lock release switch, 27
...Lock position relay, 28...Lock position detection switch, 29...Lock position display lamp.

Claims (1)

[Scope of Claim for Utility Model Registration] Power cylinders 3 and 4 are attached to the front and rear wheels 1 and 2, respectively, and the vehicle is configured to be able to perform front wheel steering, front and rear wheel steering, and crab foot steering; It is equipped with a locking mechanism 10 that locks the
In the vehicle rear wheel steering system, which is equipped with a means for turning off the pattern shift relay 31 and disabling rear wheel steering while the locking mechanism 10 is locked, an auxiliary transmission detection switch 23- detects the gear shift state of the auxiliary transmission. 1, 23-2 and the lock mechanism 10
lock release detection switches 18 and 19 are provided, and the auxiliary transmission is in a low gear position (switch 23-2
is ON) and the lock release detection switch 18 is ON, the lock is released and the auxiliary transmission is in a high gear (switch 23-1 is ON) and the lock detection switch 20 does not detect lock, an alarm means 2 that issues an alarm.
1 and 22, and a lock emergency switch 30, when the lock mechanism 10 is locked, the pattern shift relay 31 turns OFF, and the rear wheels 1, 22 are turned off.
2, when the steering of the rear wheels of the vehicle is not possible, by turning on the lock emergency switch 30, the power cylinders 3 and 4 are extended and contracted during the ON operation to enable rear wheel steering. Alarm device.