JPH0152317B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a winch drive device for driving a winch of a crane.

[Conventional technology]

A crane is equipped with a diesel engine as the prime mover. In the case of so-called mechanical cranes, this diesel engine is used directly as the drive source for the winch, and in the case of hydraulic cranes, the diesel engine drives the hydraulic motor via a pump. , this hydraulic motor is used as a drive source for the winch. That is, conventionally, either a diesel engine or a hydraulic motor (hydraulic motor, water pressure motor) has been used as a winch drive source for a crane.

[Problem to be solved by the invention]

However, although diesel engines have the advantages of good operational efficiency, high horsepower, and so-called durability, they have the disadvantages of low torque at low speeds and a narrow speed control range. On the other hand, hydraulic motors have advantages that diesel engines do not have, such as good low-speed rotation characteristics and easy speed control, but they suffer from high power transmission loss, are inferior in operating efficiency, and have weak starting power. It also has the disadvantage of lacking stickiness.

Therefore, when using a conventional winch drive device that uses only one of these as a drive source,
There are pros and cons in terms of performance; for example, there are problems in terms of winch performance, such as a lack of horsepower during high-speed hoisting (in the case of a hydraulic motor drive), or an inability to lower the winch at very low speeds (in the case of a diesel engine drive). Ta.

In addition, conventionally, the use of multiple drive sources in a hoisting device has been disclosed in Japanese Utility Model Publication No. 32-14528 and Japanese Unexamined Patent Publication No.
This method is known as shown in both Japanese Patent Nos. 54-157957. However, in this known device, two electric motors are selected or used in combination in order to widen the range of speed control, and the drive source has only one type of characteristic unique to the electric motor. The problem is not fundamentally solved.

On the other hand, as shown in Japanese Patent Publication No. 41-5182, a mooring winch is equipped with an auxiliary motor that drives a hydraulic motor via a hydraulic pump in addition to the main motor, and is used for mooring winches that require large torque. A hydraulic motor is known to be used as a drive source to transmit the rotational force of a main motor to a winch during work, and to apply a constant tension to a mooring rope after mooring to keep the vessel berthed.

However, in this configuration, two electric motors, a main motor and a sub motor, are used as the prime movers, which makes the equipment larger and more complicated, and is disadvantageous in terms of space, cost, etc.

SUMMARY OF THE INVENTION Therefore, the present invention provides a winch drive device for a crane that can selectively use two types of drive characteristics depending on the work so as to extract only the advantages of each using a single prime mover.

[Means to solve the problem]

The present invention provides a crane equipped with a diesel engine as a prime mover, in which the diesel engine is provided with first and second output shafts for separately extracting engine rotational power, a pump is connected to the second output shaft, and the pump A drive is provided between the motor output shaft of the hydraulic motor driven by the hydraulic motor, the first output shaft, and the winch hoisting shaft, which selects one of the two output shafts and connects it to the hoisting shaft. It is equipped with a source switching mechanism.

[Effect]

With this configuration, there are two drive patterns: one in which the rotational force of the diesel engine is directly transmitted to the winch, and the other in which the engine rotational force is converted to the rotational force of the hydraulic motor and transmitted to the winch. Two types of drive sources with different characteristics can be selected depending on the work so as to extract only the advantages of each.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

A is a winch, and B is a diesel engine that is the prime mover of the crane and serves as the first drive source of the winch.

To explain the general structure of winch A, 1 is a hoisting drum, 2 is a hoisting shaft of the drum 1, 3 is a planetary gear mechanism, 4 is a drum type clutch mechanism that controls the rotation of the drum 1, and 5 is the drum 1 6 is a planetary brake mechanism. Reference numeral 7 designates a clutch cylinder of the clutch mechanism 4. The operation of this cylinder 7 causes the clutch drum 8 to rotate together with the hoisting shaft 2, and the rotation of this drum 8 is transmitted to the hoisting drum 1 via the planetary gear mechanism 3. Conveyed, Motte Drum 1
It rotates in the same direction as the winding shaft 2, that is, winds up. 9 is a brake cylinder of the planetary brake mechanism 6, and the clutch drum 8 is fixed by the operation of this cylinder 9. Therefore, at this time, the rotation transmitted from the planetary gear mechanism 3 to the hoisting drum 1 is in the opposite direction to that during hoisting. In other words, a so-called power hoisting state occurs. 10 is a brake cylinder of the negative brake mechanism 5, and this cylinder 1
0, the braking force on the hoisting drum 1 is released, and in this state, the drum 1 is rotated up or down by the operation of the clutch mechanism 4 or the planetary brake mechanism 6 as described above.

Next, on the drive source side, the diesel engine B is provided with both first and second output shafts 11 and 12 from which engine rotational force is extracted separately. Of these, a pump 13 is connected to the second output shaft 12, and the pump 13 drives a hydraulic motor (hydraulic motor or water pressure motor) 14.

A drive source switching mechanism C and a chain transmission mechanism D are provided between the motor output shaft 15 of the hydraulic motor 14, the first output shaft 11 of the diesel engine B, and the hoisting shaft 2 of the winch A.

The switching mechanism C includes first and second drive gears 16 and 17 which are provided on both the first output shaft and the motor output shaft 15 so as to be movable in the axial direction, and a driven gear which can mesh with these gears 16 and 17. 18, and an intermediate shaft 19 to which the driven gear 18 is attached.

To explain the operation of this drive source switching mechanism C, as shown by the solid line in the figure, if the first drive gear 16 is moved to the distal end side of the first output shaft 11 and meshed with the driven gear 18, the first output Since the shaft 11 and the intermediate shaft 19 are connected, the rotational force of the diesel engine B is transmitted to the intermediate shaft 19.

On the other hand, as shown by the imaginary line in the figure, the first drive gear 16 is moved backward, and the second drive gear 17 is replaced instead.
When the hydraulic motor 14 is engaged with the driven gear 18, the rotational force of the hydraulic motor 14 is transmitted to the intermediate shaft 19 instead of the diesel engine B.

The chain transmission mechanism D includes sprockets 20 and 21 attached to the intermediate shaft 19 and the hoisting shaft 2,
The rotating force of the diesel engine B or the hydraulic motor 14 transmitted to the intermediate shaft 19 is transmitted to the hoisting shaft 2 via the chain transmission mechanism D.

In this way, two types of drive sources with different characteristics, the diesel engine B and the hydraulic motor 14, can be selected as appropriate, so that high output can be obtained, for example, during high-speed hoisting work that requires large horsepower. ,
Diesel engine B also has strong hoisting power.
During delicate lowering work that requires low-speed rotation, the drive source can be switched to the hydraulic motor 14, which has excellent low-speed rotation characteristics and is easy to control speed. The driving state can be obtained.

The drive source switching mechanism for switching between two types of drive sources is not limited to the gear structure described above, but may also be selected from known switching devices such as various types of clutches (mesh clutches, friction clutches, electromagnetic clutches), etc. It can be selected as appropriate.

Further, in the above embodiment, the rotational force of the first output shaft 11 and the motor output shaft 15 is transmitted to the hoisting shaft 2 via the intermediate shaft 19 and the chain transmission mechanism D, but if possible due to the equipment layout, , a drive source switching mechanism is provided directly between the first output shaft 11, the motor output shaft 15, and the hoisting shaft 2, and both output shafts 1
1 and 15 may be directly transmitted to the hoisting shaft 2. Alternatively, the diesel engine B and the hydraulic motor 14 are arranged on both sides of the hoisting shaft 2, and both output shafts 11 and 15 are connected to or separated from the hoisting shaft 2 by a drive source switching mechanism on both sides of the hoisting shaft. You may also do so.

〔Effect of the invention〕

As described above, according to the present invention, in addition to the diesel engine as the prime mover, a hydraulic motor driven by the diesel engine via a pump is provided as the second winch drive source, and these two drive sources are selected as appropriate. During hoisting, a diesel engine with high horsepower and strong hoisting power is used as the drive source, and during delicate lowering operations that require low-speed rotation, the drive source is switched to low-speed rotation. By switching to a hydraulic motor with excellent characteristics and easy speed control, it is possible to use both drive sources depending on the task and obtain a drive state that takes advantage of the strengths of each. Therefore, the winch performance can be significantly improved, and the working range of the crane can be expanded.

Furthermore, since only one diesel engine is required as the prime mover, the equipment is simple and compact, which is advantageous in terms of space and cost.

[Brief explanation of drawings]

The figure is a schematic configuration diagram of a winch drive device according to an embodiment of the present invention. A...Winch, B...Diesel engine, 2...
Hoisting shaft of winch, 11... First output shaft of diesel engine, 12... Second output shaft of same, 13... Pump, 14... Hydraulic pressure motor, 15... Motor output shaft of hydraulic motor, 16, 17, 18... Gears constituting the drive source switching mechanism, 19... intermediate shaft.

Claims (1)

[Claims] 1. In a crane equipped with a diesel engine as a prime mover, the diesel engine is provided with both first and second output shafts for separately extracting engine rotational power, a pump is connected to the second output shaft, and the pump is connected to a pump. A drive source switching mechanism is provided between the motor output shaft of the hydraulic motor to be driven, the first output shaft, and the hoisting shaft of the winch, for selecting one of both output shafts and connecting it to the hoisting shaft. A winch drive device for a crane, comprising: