JP2001347971A - Traction vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably travel a trailer interlockingly with a tractor with a simple structure. SOLUTION: In this traction vehicle, the trailer 21 is connected to the tractor 20 driving rear wheels 26 by an engine to self-propel by use of a king pin coupler device 22 such that the trailer 21 can be pulled. A rear wheel 26 part of the tractor 20 is installed with a hydraulic pump-cum-motor 35, while a rear wheel 32 part of the trailer 21 is installed with a hydraulic pump-cum-motor 36. A point between the motors 35, 36 is connected to a loop-like hydraulic circuit in series.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a towing vehicle.

[0002]

2. Description of the Related Art Conventionally, a towing vehicle in which a tractor and a trailer are connected by a kingpin coupler and the trailer is towed by the tractor, as shown in FIG. And a drive hydraulic motor 9, a drive hydraulic motor 9, and a differential unit 5 connected between left and right rear wheels 7 of the trailer 6 and a differential unit 5 connected between left and right rear wheels 7 of the trailer 6, respectively.
10 and the hydraulic pump 3 and the respective hydraulic motors 9 for driving,
10 and hydraulic pipes 11, 12 and hydraulic hoses 13-1.
5 are connected in parallel. Also, as shown in FIG. 14, one drive hydraulic motor 9, 10 is attached to each of the left and right rear wheels 4 of the tractor 1 and the left and right rear wheels 7 of the trailer 6, so that the left and right rear wheels 4, 7 are independent. In some cases, it is driven.

According to such a configuration, when the hydraulic pump 3 is driven by the engine 2, the hydraulic pump 3 is connected to the respective driving hydraulic motors 9 and 10 via the hydraulic hoses 13 to 15 and the hydraulic pipings 11 and 12, respectively. Pressure oil is supplied, and the driving hydraulic motors 9 and 10 are individually driven to generate required driving force on the rear wheel 4 of the tractor 1 and the rear wheel 7 of the trailer 6.

[0004]

However, in such a conventional towing vehicle, the driving hydraulic motors 9 and 10 are driven by the direct power of the engine 2, so that the tractor 1 and the trailer 6 are connected to each other. A complicated interlocking drive mechanism was required to interlock between the two. Further, since it is connected to the engine 2 in a direct-acting manner, the hydraulic pump 3 and the driving hydraulic motors 9
There was a risk of damage to hydraulic equipment such as 0. Furthermore, the hydraulic pump 3 and the driving hydraulic motors 9
0 is supplied to hydraulic equipment such as
Was overburdened.

It is an object of the present invention to provide a towing vehicle which can solve the above-mentioned problems and can achieve stable running by linking a tractor and a trailer without requiring a complicated mechanism. It is in.

[0006]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, the vehicle is connected to a towing vehicle which can drive by driving the rear wheels by an engine using a vehicle body coupling device. In a towing vehicle with a towable vehicle connected, a hydraulic actuator is mounted on the rear wheel of the towing vehicle, and a hydraulic actuator is mounted on the rear wheel of the accompanying vehicle, so that both hydraulic actuators are connected in series to a loop-shaped hydraulic circuit. It is characterized by being connected.

According to the first aspect of the present invention, the hydraulic actuator connected to the rear wheel portion of the towing vehicle and the hydraulic actuator connected to the rear wheel portion of the accompanying vehicle are formed in a loop hydraulic circuit. , The rear wheels of the towing vehicle and the rear wheels of the trailing vehicle can be interlocked without using a complicated interlocking drive mechanism. Further, since the hydraulic actuator is not directly connected to the engine, there is little possibility that hydraulic equipment such as the hydraulic actuator is damaged during overrun or the like. Further, when the vehicle stops running, the hydraulic actuator is stopped, so that no load is imposed on the engine. Then, the hydraulic actuator is tuned and controlled according to the traveling state of the towing vehicle and the trailing vehicle. In addition, since it is not connected directly to the engine, hydraulic components and the like can be made compact. When traveling on flat ground, four-wheel full-time traveling can be achieved by hydraulic actuators respectively provided on the towing vehicle side and the accompanying vehicle side.

In the invention described in claim 2, the loop-shaped hydraulic circuit is connected to a return flow path for releasing excess hydraulic oil and a supply flow path for supplying insufficient hydraulic oil. Features.

According to the second aspect of the present invention, a return flow path for releasing excess hydraulic oil and a supply flow path for supplying insufficient hydraulic oil to the loop-shaped hydraulic circuit. When the vehicle is turning, the turning operation of the rear wheel of the towing vehicle and the rear wheel of the accompanying vehicle is maintained, and the turning operation of the towing vehicle is stabilized.

[0010] The invention described in claim 3 is characterized in that flow rate regulating means for regulating the flow rate of hydraulic oil is connected to the loop-shaped hydraulic circuit.

According to the third aspect of the present invention, since the loop-shaped hydraulic circuit is connected to a flow rate regulating means for regulating the flow rate of the hydraulic oil, an engine brake, a retarder brake and the like are provided. In the deceleration state due to the auxiliary brake or the like, the rear wheels of the towing vehicle and the rear wheels of the accompanying vehicle operate simultaneously, so that the towing vehicle can be decelerated stably. Also, when traveling downhill, the rear wheels of the towing vehicle and the rear wheels of the accompanying vehicle are decelerated at the same time, and the rear-end collision load generated on the vehicle body coupling device provided on the towing vehicle side is alleviated, causing a jackknife phenomenon. Can be prevented.

[0012] The invention described in claim 4 is characterized in that an actuator rotation inhibiting means for inhibiting rotation of the hydraulic actuator is connected to the loop-shaped hydraulic circuit in parallel with each hydraulic actuator.

[0013] According to the invention according to claim 4 configured as described above, when the vehicle starts on an uphill, the entire load moves rearward, so that no load is applied to the axle on the towing vehicle side.
The rear wheels may slip and become unable to start.However, by activating the actuator rotation suppression means, the tuning and control functions of the hydraulic actuator work, and the hydraulic actuator on the accompanying vehicle exerts the driving force, causing jumping. The starting can be facilitated by eliminating the rear wheel slip due to the phenomenon. Further, when a slip phenomenon occurs on a rough road or a snowy road, the axles 28 and 34 on the slipped side are operated by operating the actuator rotation suppressing means.
The other axles 34, 28 can be driven by using the rotation of, and the driving force can be recovered.

According to a fifth aspect of the present invention, there is provided a hydraulic connection mechanism capable of separately connecting the loop hydraulic circuit to a towing vehicle hydraulic circuit and an auxiliary vehicle hydraulic circuit.

According to the fifth aspect of the present invention, there is provided a hydraulic connection mechanism capable of separately connecting the loop-shaped hydraulic circuit to a towing vehicle-side hydraulic circuit and an auxiliary vehicle-side hydraulic circuit. Therefore, the towing vehicle and the accompanying vehicle can be easily connected and disconnected.

[0016] The invention described in claim 6 is characterized in that hydraulic free means is connected to the loop hydraulic circuit in parallel with each hydraulic actuator.

According to the sixth aspect of the present invention, since hydraulic free means is connected to the loop-shaped hydraulic circuit in parallel with each hydraulic actuator, independent operation of the towing vehicle and towing vehicle can be performed. And the accompanying vehicle can be operated in combination with other vehicles.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 12 show an embodiment of the present invention.

First, the configuration will be described. In the towing vehicle according to this embodiment, a trailing vehicle such as a trailer 21 is connected to a trailing vehicle such as a kingpin coupler device 22 in contrast to a towing vehicle that can be driven by an engine such as a tractor 20. They are separably connected using a vehicle body connection device.

The tractor 20 has a driver's seat 24 on the upper surface side of the front of the chassis 23 and a connecting portion of the kingpin coupler device 22 on the upper surface side of the rear of the chassis 23. Steerable left and right front wheels 25 are provided on the lower surface side of the front portion of the chassis 23, and are located on the lower surface side of the rear portion of the chassis 23 and behind the kingpin coupler device 22. Wheels 26 (mechanical drive wheels) are provided. The rear wheel 26 is connected to both ends of an axle 28 having a differential portion 27,
The driving force of an engine 37 (see FIG. 5) provided in the tractor 20 is transmitted to a transmission mechanism (not shown)
9, and transmitted through a mechanical drive mechanism 30 such as a differential section 27 and an axle 28.

Further, the trailer 21 is
And left and right rear wheels 32 provided at the rear of the loading platform 31
(Mechanical driven wheels). The rear wheel 32 is connected to both ends of an axle 34 having a differential portion 33. The trailer 21 has a connecting portion of a kingpin coupler device 22 on the lower surface side of the front portion, and
The rear wheel 26 of the tractor 20 can be used as its front wheel when connected to zero.

Then, as shown in FIG.
A hydraulic actuator such as a hydraulic pump / motor 35 is attached to the rear of the differential section 27 of the mounting bracket 3.
8. The hydraulic pump / motor 35 is connected to the rear end of the input / output shaft 40 of the differential section 27 connected to the propeller shaft 29 via the universal joint 39 via a companion flange 41, a coupling joint 42 and the like. I have. The companion flange 41 and the coupling joint 42 are housed in a mounting bracket 38.

Similarly, as shown in FIG.
A hydraulic actuator such as a hydraulic pump / motor 36 is mounted in front of the differential section 33 of the mounting bracket 4.
3 is attached. The hydraulic pump / motor 35 is connected to the front end of the input / output shaft 144 of the differential section 33 via a companion flange 145, a coupling joint 146, and the like. The companion flange 145 and the coupling joint 146 are housed in the mounting bracket 43.

A hydraulic oil tank 44 is provided at a position behind the driver's seat 24 on the chassis 23 of the tractor 20. As shown in FIG. 5, a hydraulic pressure is provided between two connection ends 44a and 44b provided in the hydraulic oil tank 44 and two ports 35a and 35b of the hydraulic pump / motor 35 of the tractor 20. A loop-shaped towing vehicle-side hydraulic circuit 47 is connected by piping 45a, 45b, hydraulic hoses 46a, 46b, and the like.

Suction filters 48a and 48b are provided at connection ends 44a and 44b of the hydraulic pipes 45a and 45b with the hydraulic oil tank 44, respectively. The suction filters 48a and 48b are housed in the hydraulic oil tank 44.

In-line check valves 49a and 49b are provided near the hydraulic oil tank 44 of the hydraulic pipes 45a and 45b so that pressure oil can flow only in one direction from the hydraulic oil tank 44 side to the hydraulic pump / motor 35 side. Each is provided. The towing vehicle side hydraulic circuit 47 is functionally connected to the hydraulic oil tank 44 by means of the in-line check valves 49a and 49.
The flow path is broadly divided into a supply flow path 47a for supplying hydraulic oil to the hydraulic pump / motor 35 via b, and a migration flow path 47b for migrating hydraulic oil using the hydraulic pump / motor 35.

Hydraulic free means such as an unloader valve 50 is connected to the migration flow path 47b in parallel with the hydraulic pump / motor 35 via a flow path 45c. In addition, a flow path 45 d in which actuator rotation suppression means such as a relief valve 51 and a stop valve 52 are connected in series is connected in parallel with the hydraulic pump / motor 35. The unloader valve 50 is a normally closed valve, and the stop valve 52 is a normally open valve.

Further, the migration channel 47b and the hydraulic oil tank 44
Between the relief valve 53 and the return filter 5
4 is connected.

From the hydraulic circuit 47 on the towing vehicle side, flexible connecting ends 56a and 56b such as hydraulic hoses are provided.
Are branched so as to constitute a part of the migration channel 47b. A flow restricting means such as a retarder valve 57 for restricting the flow rate of the hydraulic oil is provided at a connection portion between the connection end 56b and the migration flow path 47b of the towing vehicle hydraulic circuit 47.

On the other hand, a pair of joints 60a and 60b such as hydraulic couplers to which the terminals of the connection ends 56a and 56b can be attached and detached are provided at the front end of the loading platform 31 of the trailer 21. The connecting end 56 on the tractor 20 side
a, 56b and the joints 60a, 60 on the trailer 21 side.
0b constitutes a hydraulic connection mechanism 58.

The joints 60a, 60b and the two ports 36 of the hydraulic pump / motor 36 of the trailer 21
a, 36b between the hydraulic hoses 61a, 61b, respectively.
b, an accompanying vehicle-side hydraulic circuit 63 is connected by hydraulic piping 62a, 62b and the like. Then, the connection ends 56a, 56
b and the joint portions 60a and 60b, the hydraulic pump / motors 35 and 36 are connected in series to the loop-shaped hydraulic circuit (the migratory flow path 47b of the towing vehicle-side hydraulic circuit 47 and the accompanying vehicle-side hydraulic circuit 63). As a result, the hydraulic oil is migrated. In addition, for example, the rear wheel 2 of the tractor 20
6 and the rear wheel 32 of the trailer 21 are both rotating forward, so that the hydraulic oil discharged from the hydraulic pump / motor 35, 36 circulates in the same direction through the loop hydraulic circuit.
The discharge direction of the hydraulic pump / motor 35, 36 is set in advance.

A hydraulic free means such as an unloader valve 64 is connected to the auxiliary vehicle side hydraulic circuit 63 in parallel with the hydraulic pump / motor 36 via a flow path 62c. A flow path 62d in which actuator rotation suppressing means such as a relief valve 65 and a stop valve 66 are connected in series.
Are connected in parallel with the hydraulic pump / motor 36. The unloader valve 64 is a normally closed valve, the stop valve 6
6 is a normally open valve.

An electric circuit wire harness 67 extending from a control switch box 68 provided in the driver's seat 24 is connected to the retarder valve 57, the stop valve 52,
66. This control switch box 6
The switch 8 is provided with operation switches such as a retarder brake switch 69, a front wheel slip stop switch 70, and a rear wheel slip stop switch 71.

Next, the operation of this embodiment will be described.

The towing vehicle such as the tractor 20 has an engine 3
7, a transmission mechanism (not shown) and a propeller shaft 2
9. By transmitting the driving force to the rear wheel 26 via the mechanical driving mechanism 30 such as the differential portion 27 and the axle 28, the vehicle can run independently by the driving force of the engine 37. The tractor 20 can steer the left and right front wheels 25 to change the direction.

The trailer 21 is towed through the kingpin coupler device 22 by mechanically connecting an accompanying vehicle such as a trailer 21 to the tractor 20 by a vehicle connecting device such as a kingpin coupler device 22. Can be.

In this embodiment, when connecting the tractor 20 and the trailer 21, the connecting end 56 on the tractor 20 side is used.
a, 56b and the joints 60a, 60 on the trailer 21 side.
0b, and the hydraulic pump / motors 35 and 36 are connected to a loop-shaped hydraulic circuit (the traveling flow path 4 of the towing vehicle-side hydraulic circuit 47).
7b and the associated vehicle-side hydraulic circuit 63).

Then, the rotation of the rear wheel 26 (mechanical drive wheel) of the tractor 20 causes the corresponding hydraulic pump / motor 3
5 is driven, and the hydraulic oil discharged from the hydraulic pump / motor 35 flows into the loop-shaped hydraulic circuit. Similarly,
The rotation of the rear wheel 32 (mechanically driven wheel) of the trailer 21 drives the corresponding hydraulic pump / motor 36, and the hydraulic oil discharged from the hydraulic pump / motor 36 flows into the loop hydraulic circuit. Thereby, the hydraulic pump / motor 35 on the tractor 20 side and the hydraulic pump / motor 36 on the trailer 21 side are hydraulically linked, and the rear wheel 26 of the tractor 20 and the rear wheel 32 of the trailer 21 are hydraulically linked. Become so. Then, a hydraulic driving force acts (generates and transmits) on the rear wheel 32 of the trailer 21.

That is, as shown in FIG. 6, when the tractor 20 travels straight on a flat ground with the trailer 21 connected thereto, the hydraulic oil generated by the hydraulic pump / motor 35 by the rotation of the rear wheel 26 of the tractor 20 Is equal to the oil amount and flow direction of the hydraulic oil generated in the hydraulic pump / motor 36 by the rotation of the rear wheel 32 of the trailer 21, so that the towing vehicle-side hydraulic circuit 47 has a migration path 47 b. The hydraulic pump / motors 35 and 36 are synchronized by hydraulic oil migrating between the hydraulic pump / motors 35 and 36 via the accompanying vehicle-side hydraulic circuit 63, and the rear wheels 26 and 32 are operated.
Perform substantially the same rotation, and the rear wheel 26 of the tractor 20 and the rear wheel 32 of the trailer 21 are in a four-wheel full-time running state, whereby the running of the towing vehicle is stabilized. At this time, since the hydraulic pump / motors 35 and 36 are each in a no-load state, the running resistance generated in the hydraulic system is reduced. In addition,
Specifically, the hydraulic oil is a hydraulic pump / motor 35, a hydraulic hose 46a, a migration channel 47b portion of a hydraulic pipe 45a, a connection end 56a, a hydraulic pipe 62a, a hydraulic hose 61a, a hydraulic pump / motor 36, a hydraulic hose 61b, Hydraulic piping 62
b, the connection end 56b, the portion of the migration flow path 47b of the hydraulic pipe 45b, the hydraulic hose 46b, and the hydraulic pump / motor 35 circulate in this order.

As shown in FIG. 7, when the towing vehicle retreats, the axle 28 of the rear wheel 26 of the tractor 20 and the trailer 2
Since the rotation of one rear wheel 32 axle 34 is reversed, the flow of hydraulic oil migrating between the hydraulic pump / motor 35 and 36 is in the opposite direction to the above. Otherwise, it is almost the same as above.

As shown in FIG. 8, when the towing vehicle turns, the rotation speed of the rear wheel 26 of the tractor 20 and the trailer 21
Since the rotation speed of the rear wheel 32 differs, the amount of hydraulic oil sucked / discharged by the hydraulic pump / motor 35 on the tractor 20 side and the amount of hydraulic oil sucked / discharged by the hydraulic pump / motor 36 on the trailer 21 side (Usually, the suction / motor 35 of the hydraulic pump / motor 35 on the tractor 20 side).
The discharge amount is larger). As a result, the excess hydraulic oil migrates through the flow path 45 d, and the relief valve 53 is operated, and the excess hydraulic oil is discharged from the discharge side of the hydraulic pump / motor 35 through the return filter 54 and the return flow path 55. Is returned to the hydraulic oil tank 44. Also,
The in-line check valve 49b operates to supply a shortage of hydraulic oil from the hydraulic oil tank 44 to the suction side of the hydraulic pump / motor 35. Thereby, the synchronized operation of the hydraulic pump / motors 35 and 36 is maintained, and the turning traveling of the towing vehicle is stabilized.

As shown in FIG. 9, when the towing vehicle is traveling on a downhill, the retarder brake switch 69 of the control switch box 68 provided in the driver's seat 24 is operated.
The retarder valve 57 is operated. Then, the operation of the retarder valve 57 causes the hydraulic pump / motor 35, 36 to operate.
Since the flow rate of the hydraulic oil migrating between them is regulated, a load is applied to each of the hydraulic pump / motor 35 and 36, and both the rear wheels 26 and 32 are decelerated and braked. This allows
The rear-end collision load generated in the kingpin coupler device 22 is reduced, and stable traveling is enabled. For example, when the towing vehicle travels downhill, the weight of the tractor 20 and the trailer 21 and the load such as the load move forward, and if the deceleration operation is performed carelessly by the auxiliary brake or the foot brake in this state, the traveling May become unstable and cause a jackknife phenomenon. In this embodiment, the occurrence of the jackknife phenomenon can be prevented.

As shown in FIG. 10, when the towing vehicle starts on an uphill, the weight of the tractor 20 and the trailer 21 and the load such as the load move rearward.
The load is not applied to the rear wheel 26, and the rear wheel 26 may run idle. When the rear wheel 26 of the tractor 20 to which the driving force of the engine 37 is transmitted idles, the hydraulic pump / motor 3
5 rotates at high speed, sucks a large amount of hydraulic oil from the hydraulic oil tank 44 via the in-line check valve 49b, and discharges a large amount of high-pressure hydraulic oil. At this time, the front wheel slip stop switch 70 of the control switch box 68 provided in the driver's seat 24 is operated to operate the stop valve 52 to close the flow passage 45d. Then, a large amount of high-pressure hydraulic oil discharged from the hydraulic pump / motor 35 is supplied to the flow path 45d.
Can not escape to the hydraulic pump / motor 3
Since a large amount of high-pressure hydraulic oil discharged from 5 is forcibly sent to the hydraulic pump / motor 36, the hydraulic pump / motor 36 is driven to generate a driving force on the rear wheel 32 of the trailer 21. Thereby, the rear wheel 2 of the tractor 20
It is possible to assist the inability to tow using the kingpin coupler device 22 due to the idling of No. 6. This state is instantaneous, and is immediately restored to the circuit state during normal running. The driving force of the engine 37 is transmitted to the hydraulic pump / motor 36 via the hydraulic system, so that the tractor 20
The idle rotation of the rear wheel 26 and the hydraulic pump / motor 35 is suppressed.

As shown in FIG. 11, the towing vehicle is on a rough road.
When a slip phenomenon occurs on a snowy road or the like, for example, when the rear wheel 26 of the tractor 20 slips in a slip state, a large amount of high-pressure hydraulic oil generated by the hydraulic pump / motor 35 is used as in the case of FIG. Acted on pump / motor 36. At this time, there is a difference in the amount of hydraulic oil to be discharged due to a rotation difference between the hydraulic pump / motors 35 and 36. Then, the relief valve 53 operates and the return filter 5
4 and the hydraulic pump / motor 35 via the return flow path 55
The excess hydraulic oil is returned to the hydraulic oil tank 44 from the discharge side. Also, in-line check valves 49a, 49b
Is activated and the hydraulic pump / motor 3
Insufficient hydraulic oil is supplied to the suction side of No. 5. In this state, the control switch box 6 provided in the driver's seat 24
By operating the front wheel slip stop switch 70 of No. 8, the stop valve 52 is operated to close the flow passage 45d. Then, a large amount of high-pressure hydraulic oil discharged from the hydraulic pump / motor 35 cannot escape to the flow path 45d, and the large amount of high-pressure hydraulic oil discharged from the hydraulic pump / motor 35 is forcibly applied to the hydraulic pump / motor 36. To drive the hydraulic pump / motor 36. When the rear wheel 32 of the trailer 21 is idle, the rear wheel slip stop switch 71 of the control switch box 68 provided in the driver's seat 24 is operated to operate the stop valve 66.

Then, as shown in FIG.
When the trailer 21 is separated from the trailer 21, the connecting ends 56 a and 56 b of the tractor 20 and the joint 60
a and 60b. When running the tractor 20 in this state, the unloader valve 50 is opened.
Then, the hydraulic oil of the towing vehicle-side hydraulic circuit 47 moves between the hydraulic pump / motor 35 and the unloader valve 50, so that the tractor 20 can travel without burdening the hydraulic pump / motor 35. Can be. In a state where the joints 60a and 60b are separated from each other, the hydraulic oil of the associated vehicle-side hydraulic circuit 63 cannot migrate, so that the parking brake is applied to the trailer 21. Here, in order to move the separated trailer 21, the unloader valve 64 is opened. Then, the hydraulic oil of the auxiliary vehicle-side hydraulic circuit 63 moves between the hydraulic pump / motor 36 and the unloader valve 64, so that the trailer 21 can be moved without imposing a load on the hydraulic pump / motor 36. Becomes possible.

As described above, according to this embodiment, the hydraulic pump / motor 35 connected to the rear wheel 26 of the tractor 20 and the hydraulic pump / motor 36 connected to the rear wheel 32 of the trailer 21 are formed in a loop. By connecting in series to the hydraulic circuit, the rear wheel 26 of the tractor 20 and the rear wheel 32 of the trailer 21 can be interlocked without using a complicated interlocking drive mechanism.

Further, since the hydraulic pump / motor 35, 36 is not directly connected to the engine 37, there is little possibility of damage to hydraulic equipment such as the hydraulic pump / motor 35, 36 during overrun. .

Further, the hydraulic pump / motors 35 and 36 are stopped when the vehicle stops running, so that no load is applied to the engine 37.

Then, the hydraulic pump / motor 35, 36
Is tuned and controlled according to the traveling state of the tractor 20 and the trailer 21.

Further, since it is not directly connected to the engine 37, it is possible to make hydraulic components and the like compact.

Hydraulic pumps / motors 35 and 36 provided on the tractor 20 and trailer 21 sides when traveling on flat ground, respectively.
Thus, a four-wheel full-time running state can be achieved.

At the time of turning or the like, the synchronized operation of the rear wheel 26 of the tractor 20 and the rear wheel 32 of the trailer 21 is maintained, and the turning traveling of the towing vehicle is stabilized.

When the vehicle is being decelerated by an engine brake, a retarder brake, an auxiliary brake, or the like, the rear wheel 26 of the tractor 20 and the rear wheel 32 of the trailer 21 operate simultaneously, so that the towing vehicle can be decelerated stably.

When traveling downhill, the rear wheels 26 of the tractor 20
And the rear wheel 32 of the trailer 21 are simultaneously decelerated, so that the rear-end collision load generated in the kingpin coupler device 22 provided on the tractor 20 side is reduced, and the jack knife phenomenon can be prevented.

When the vehicle starts on an uphill, the entire load moves rearward, so that no load is applied to the axle 28 on the tractor 20 side, and the rear wheel 26 may slip and cannot start. The synchronizing / control function by the motors 35 and 36 works, and the hydraulic pump / motor 36 on the trailer 21 side exerts a driving force, and the rear wheel 2 due to a jumping phenomenon.
6 can be eliminated to facilitate starting.

When a slip phenomenon occurs during traveling on a rough road or a snowy road, the rotation of the axles 28, 34 on the slipping side can be used to drive the other axles 34, 28 to recover the driving force.

Further, the connecting ends 56a, 5
The hydraulic connection mechanism 58 including the joint 6b and the joints 60a and 60b on the trailer 21 side can be easily connected and disconnected by a hydraulic coupler or the like.

Since hydraulic free means such as unloader valves 50 and 64 are provided in the towing vehicle-side hydraulic circuit 47 and the accompanying vehicle-side hydraulic circuit 63, the tractor 20 can be operated independently or the tractor 20 and the trailer 21 can be combined with other vehicles. Can be operated.

[0060]

As described above, according to the first aspect of the present invention, the hydraulic actuator connected to the rear wheel portion of the towing vehicle and the hydraulic actuator connected to the rear wheel portion of the trailing vehicle are formed into a loop hydraulic pressure. By connecting in series to the circuit, it becomes possible to interlock the rear wheel of the towing vehicle and the rear wheel of the accompanying vehicle without using a complicated interlocking drive mechanism. Further, since the hydraulic actuator is not directly connected to the engine, there is little possibility that hydraulic equipment such as the hydraulic actuator is damaged during overrun or the like. Further, when the vehicle stops running, the hydraulic actuator is stopped, so that no load is imposed on the engine. Then, the hydraulic actuator is tuned and controlled according to the traveling state of the towing vehicle and the trailing vehicle. In addition, since it is not connected directly to the engine, hydraulic components and the like can be made compact. When traveling on flat ground, four-wheel full-time traveling can be achieved by hydraulic actuators respectively provided on the towing vehicle side and the accompanying vehicle side.

According to the second aspect of the present invention, the loop-shaped hydraulic circuit is connected to the return flow path for releasing the excess hydraulic oil and the supply flow path for supplying the insufficient hydraulic oil. In this way, the synchronized operation of the rear wheels of the towing vehicle and the rear wheels of the accompanying vehicle is maintained, and the turning traveling of the towing vehicle is stabilized.

According to the third aspect of the present invention, by connecting the flow control means for controlling the flow rate of the hydraulic oil to the loop-shaped hydraulic circuit, the deceleration state by the engine brake, the retarder brake, the auxiliary brake or the like can be achieved. Since the rear wheels of the towing vehicle and the rear wheels of the accompanying vehicle operate simultaneously, the towing vehicle can be decelerated stably. Also, when traveling downhill, the rear wheels of the towing vehicle and the rear wheels of the accompanying vehicle are decelerated at the same time, and the rear-end collision load generated on the vehicle body coupling device provided on the towing vehicle side is alleviated, causing a jackknife phenomenon. Can be prevented.

According to the fourth aspect of the invention, when the vehicle starts on an uphill, the entire load moves rearward, so that no load is applied to the axle on the towing vehicle side, and the rear wheel slips and cannot start. There is a danger, but by activating the actuator rotation suppression means, the tuning and control function of the hydraulic actuator works, and the hydraulic actuator on the accompanying vehicle exerts the driving force, eliminating the rear wheel slip due to jumping phenomenon and starting Can be facilitated. In addition, bad road
When a slip phenomenon occurs during traveling on a snowy road, the other axle 3 is driven by the rotation of the axles 28 and 34 on the slipping side by activating the actuator rotation suppression means.
4, 28 can be driven to recover the driving force.

According to the fifth aspect of the present invention, the hydraulic connection mechanism capable of separating and coupling the loop-shaped hydraulic circuit to the towing vehicle-side hydraulic circuit and the auxiliary vehicle-side hydraulic circuit is provided. Can be easily connected and disconnected.

According to the sixth aspect of the present invention, since hydraulic free means is connected to the loop-shaped hydraulic circuit in parallel with each hydraulic actuator, the towing vehicle can be operated independently, and the towing vehicle and the accompanying vehicle can be connected to each other. Can be operated in combination,
That is, it can exert a practically useful effect.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an embodiment of the present invention.

FIG. 2 is a schematic plan view of FIG.

FIGS. 3A and 3B show a hydraulic pump and motor on the tractor side in FIG. 1, wherein FIG. 3A is a plan view, FIG. 3B is a side view, and FIG.

FIGS. 4A and 4B show a hydraulic pump and motor on the trailer side in FIG. 1, wherein FIG. 4A is a plan view, FIG. 4B is a side view, and FIG.

FIG. 5 is a hydraulic system diagram according to the embodiment of the present invention.

6A and 6B are diagrams illustrating an operation of the vehicle when traveling straight on a flat ground, wherein FIG. 6A is a vehicle side view, FIG. 6B is a vehicle plan view, and FIG. 6C is a hydraulic system diagram.

7A and 7B are diagrams showing a side view of a vehicle, and FIG.
(B) is a vehicle plan view, (c) is a hydraulic system diagram.

8A and 8B are diagrams showing a plan view of a vehicle according to an operation during a turn.
(B) is a hydraulic system diagram.

FIGS. 9A and 9B show an operation during downhill traveling, in which FIG. 9A is a side view of the vehicle, and FIG. 9B is a hydraulic system diagram.

10A and 10B are diagrams showing a vehicle side view, and FIG. 10B is a hydraulic system diagram, showing an operation at the time of starting uphill.

FIG. 11 shows the operation when slipping on a rough road or a snowy road.
(A) is a vehicle side view, (b) is a vehicle plan view, (c) is a hydraulic system diagram.

12 (a) is a side view of the vehicle, and FIG. 12 (b) is a hydraulic system diagram.

13A is a side view of a conventional example, and FIG. 13B is a plan view of a conventional example.

14A is a side view of another conventional example, and FIG. 14B is a plan view of another conventional example.

[Explanation of symbols]

 Reference Signs List 20 tractor (towing vehicle) 21 trailer (attachment vehicle) 22 kingpin coupler device (body coupling device) 26 rear wheel 32 rear wheel 35 hydraulic pump and motor (hydraulic actuator) 36 hydraulic pump and motor (hydraulic actuator) 37 engine 47 towing vehicle Side hydraulic circuit (loop-shaped hydraulic circuit) 47a Migration flow path (loop-shaped hydraulic circuit) 47b Supply flow path 50 Unloader valve (hydraulic free means) 52 Stop valve (actuator rotation suppressing means) 55 Return flow path 57 Retarder valve ( 58) Hydraulic connection mechanism 63 Associated vehicle side hydraulic circuit (loop-shaped hydraulic circuit) 64 Unloader valve (hydraulic free means) 66 Stop valve (actuator rotation suppressing means)

Claims (6)

[Claims] 1. A towing vehicle in which a rear wheel is driven by an engine and an accompanying vehicle is connected to a self-propelled towing vehicle using a vehicle body connecting device, wherein a hydraulic actuator is provided on a rear wheel portion of the towing vehicle. A towing vehicle, wherein a hydraulic actuator is mounted on a rear wheel portion of an accompanying vehicle and both hydraulic actuators are connected in series to a loop-shaped hydraulic circuit. 2. The loop hydraulic circuit according to claim 1, wherein a return flow path for releasing excess hydraulic oil and a supply flow path for supplying insufficient hydraulic oil are connected. Towing vehicle. 3. The towing vehicle according to claim 1, wherein a flow rate regulating means for regulating a flow rate of hydraulic oil is connected to the loop-shaped hydraulic circuit. 4. The traction system according to claim 1, wherein an actuator rotation inhibiting means for inhibiting rotation of the hydraulic actuator is connected to the loop hydraulic circuit in parallel with each hydraulic actuator. For vehicles. 5. The hydraulic connection mechanism according to claim 1, further comprising a hydraulic connection mechanism capable of separately connecting the loop hydraulic circuit to a towing vehicle hydraulic circuit and an auxiliary vehicle hydraulic circuit. The towing vehicle described. 6. The towing vehicle according to claim 1, wherein hydraulic free means is connected to the loop hydraulic circuit in parallel with each hydraulic actuator.