JPH11235932A - Transport vehicle in tunnel - Google Patents

Abstract

(57) [Problem] To provide a compact transport vehicle in a tunnel capable of running at high speed and having a shifting function. An HST and an electric motor for driving the HST hydraulic pump are provided, and the output of the HST hydraulic motor is transmitted to driving wheels.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport vehicle in a tunnel used for transporting segments in a shield tunnel, and more particularly, to a power system for driving wheels.

[0002]

2. Description of the Related Art When an internal combustion engine is used as a power source for a vehicle transported in a tunnel, its exhaust gas depletes oxygen in the tunnel, and substances contained in the exhaust gas adhere to the inner surface of the tunnel to clean the inner surface. Would be dirty.

[0003] Therefore, in a conventional transporting vehicle in a tunnel, an electric motor is used as a power source for the traveling, and
The wheels are directly driven by this electric motor.

[0004]

The transport vehicle in the tunnel driven by the electric motor has the following disadvantages.

A) Since the capacity of the battery is limited, a large output cannot be obtained. Therefore, we will use iron wheels as wheels and run on rails,
In this case, slippage limits the maximum slope.

B) Also, due to the difficulty of shifting during automatic driving, no shifting means is provided, and therefore the maximum speed is limited.

C) A transport vehicle using tire-type running wheels has also been proposed, which transmits the outputs of two large DC electric motors to left and right driving wheels via reduction gears, respectively. Is configured. Since this transport vehicle performs a skid steer type steering (a type of steering utilizing a rotation difference between left and right driving wheels), good steering performance cannot be expected, and steering becomes difficult particularly during high-speed traveling. In addition, since it is difficult to provide a suspension mechanism due to its structure, the mechanism is generally omitted. Therefore, the maximum traveling speed of this transport vehicle is limited to about 8 km / h despite using tire-type traveling wheels.

An object of the present invention is to provide a compact transport vehicle in a tunnel capable of high-speed running and having a shifting function in view of such a situation.

[0009]

A first aspect of the present invention includes an HST and an electric motor for driving a hydraulic pump of the HST, and transmits an output of the HST hydraulic motor to driving wheels. It is characterized by having.

According to the first aspect, since the HST having the speed change function is interposed between the electric motor and the drive wheels, the speed change can be easily performed, and the high speed traveling can be performed by the speed change. Will be possible.

[0011] Further, since the HST capable of constant horsepower control is used, the torque at a low speed can be increased, and as a result, the maximum slope can be increased.

Further, by setting the maximum discharge amount of the pump to be large, the maximum traveling speed can be increased.

Furthermore, since the pump and the hydraulic motor are connected by piping, the degree of freedom in their arrangement is high, and thus the size of the vehicle body is restricted (for example, vehicle width 1. 8m or less, foil base 2.6m or less),
Sufficient design flexibility is obtained.

According to a second aspect, in the first aspect, the HST includes a plurality of hydraulic motors operated in parallel by the hydraulic pumps, and each of the hydraulic motors is directly connected to a different drive wheel. It is characterized by:

According to the second aspect of the present invention, the need for a differential device and a constant velocity joint for transmitting power to drive wheels from the differential device is eliminated, so that the configuration can be simplified and the size can be reduced, and the suspension mechanism can be simplified. Mounting is also easy.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, one embodiment of a vehicle for transporting in a tunnel according to the present invention is a front wheel 1, 1 which is a tire type driven wheel, and a rear wheel 2, which is a driving wheel.
2, an electric motor 3, a variable displacement hydraulic pump 4 driven by the electric motor 3, a hydraulic motor 5 driven by oil discharged from the hydraulic pump 4, and an output of the hydraulic motor 5 to a constant velocity joint 6, 6 is provided with a differential device 7 for transmitting to the rear wheels 2, 2 via.

The hydraulic pump 4 and the hydraulic motor 5 are provided by a so-called HST (Hydro Static Transmission).
Is composed.

As is well known, the HST has a closed circuit for returning the oil discharged from the hydraulic pump 4 to the hydraulic pump 4 via the hydraulic motor 5 and controlling the tilt angle of the swash plate of the pump 4. The rotation speed of the motor can be changed continuously. That is, a continuously variable transmission can be realized.
Further, since the swash plate tilt angle of the pump 4 can be set to the plus side and the minus side, a reverse rotation operation is also possible.

In the transport vehicle in the tunnel, when the hydraulic pump 4 is driven by the electric motor 3, the hydraulic motor 5 is rotated by the oil discharged from the pump 4. Then, the rotation of the output shaft of the hydraulic motor 5 is transmitted to the rear wheels 2, 2 via the differential device 7 and the constant velocity joints 6, 6, whereby the transport vehicle travels.

The hydraulic pump 4 has a swash plate driving actuator (not shown), and the vehicle speed is changed during automatic operation by controlling the swash plate tilt angle of the pump 4 by the swash plate driving actuator. .

In this transportation vehicle, the pump 4
And the motor 5 are connected by a pipe 8.

FIG. 2 shows another embodiment of the transport vehicle in a tunnel according to the present invention. In this transport vehicle, two hydraulic motors 9, 9 are used, and these are connected to the rear wheels 2, 2,
Is directly connected to

The hydraulic motors 9, 9 are connected in parallel to a hydraulic pump 4 via a pipe 10, and constitute an HST together with the pump 4.

This transport vehicle travels by the simultaneous parallel operation of the motors 9, 9 by a hydraulic pump. At this time, when the front wheels 1 are steered, the motors 9, 9 are driven with a difference in the number of rotations. That is, the vehicle turns while performing the differential operation.

In the case of the vehicle having the configuration shown in FIG. 2, it is possible to achieve a maximum slope of 100/1000 and a maximum speed of 20 km / h.

According to the transport vehicle according to each of the above embodiments,
By controlling the HST at equal horsepower, it is possible to increase the torque at low speeds, and as a result, the maximum slope is increased.

Further, high speed traveling can be achieved by utilizing the speed change function of the HST, and the maximum traveling speed can be further increased by setting the maximum discharge amount of the hydraulic pump 4 to be large.

Further, since the hydraulic pump 4 and the hydraulic motor 5 or the hydraulic motors 9, 9 are connected by piping, the degree of freedom in their arrangement is high, which is advantageous in increasing the degree of freedom in design.

The transporting vehicle is used, for example, for transporting segments in a shield tunnel. In this case, the transporting vehicle travels while being guided by guide rails 11 as shown in FIG.

The course detecting mechanism 12 shown in FIG. 3 is attached to the front lower part of the vehicle body via a bracket 13, and includes a sensor unit 14, an arm 15 extending from the sensor unit 14, and a tip end of the arm 15. And a contact 16 provided.

The sensor unit 14 has a swivel bracket 14a rotatable around the longitudinal axis of the vehicle body, and a tilt bracket 14b supported by the swivel bracket 14a and rotatable around the left and right axis of the vehicle body. The arm 15 has a base end pivotally attached to a tilt bracket 14b via a support shaft 15a.
It can swing right and left around 5a.

The tilt bracket 14b has a support shaft 1 attached thereto.
A sensor 17 for detecting the rotation angle of 5a is attached.

On the other hand, since the contact 16 is supported via the sensor unit 14 and the arm 15 having the above structure, the contact 16 can move following the guide rail 11.

FIG. 4 shows a steering mechanism.
The steering mechanism includes a steering cylinder 18 provided for each front wheel 1, an electromagnetic control valve 19 for supplying pressure oil to the steering cylinder 18, a hydraulic pump 20, and an actual steering angle of the front wheel 1. A sensor 21 for detecting is provided.

The front wheels 1, 1 are linked via a tie rod (not shown) so that they are linked to each other.

When the vehicle travels, the contact 16 moves along the guide rail 11, and as a result, the guide rail 1
1 is detected by the sensor 17. Therefore, the steering control unit 22 calculates a target steering angle for correcting the displacement based on the output of the sensor 17,
The electromagnetic control valve 19 is controlled so that the deviation between the target steering angle and the actual steering angle detected by the sensor 21 is eliminated.

Thus, the vehicle follows the guide rail 11, that is, travels along a predetermined travel route defined by the guide rail 11.

[Brief description of the drawings]

FIG. 1 is a plan view conceptually showing an embodiment of a transport vehicle in a tunnel according to the present invention.

FIG. 2 is a plan view conceptually showing another embodiment of the present invention.

FIG. 3 is a perspective external view showing a course detection mechanism.

FIG. 4 is a configuration diagram of a steering mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 3 Electric motor 4 Hydraulic pump 5 Hydraulic motor 7 Differential device 9, 9 Hydraulic motor

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B62D 57/024 F16H 39/02 F16H 39/02 B60K 1/00 // B60K 1/00 7/00 7/00 B62D 57/02 J 6/00 B60K 9/00 Z 8/00

Claims (2)

[Claims] 1. A transport vehicle in a tunnel, comprising: an HST; and an electric motor for driving the hydraulic pump of the HST, wherein an output of the hydraulic motor of the HST is transmitted to driving wheels. 2. The HST according to claim 1, wherein the HST includes a plurality of hydraulic motors operated in parallel by the hydraulic pump, and each of the hydraulic motors is directly connected to a different driving wheel. Transport vehicle in the tunnel.