JPH10109889A - Swivel for construction machinery - Google Patents

Abstract

(57) [Summary] In a swing device of a construction machine, rattling when an upper swing body is stopped is prevented by a simple configuration. When a revolving superstructure (2) is stopped, a first switching valve (7) is switched to a neutral position, and a motor hydraulic power source (30) is turned on.
Then, the supply of the pressure oil to the hydraulic motors 4a and 5a is stopped.
Next, the second switching valve 16 is switched to the a position, and the first switching valve 7 is switched to the a position or the b position. As a result, the hydraulic motors 4a and 5a rotate in different rotation directions, and the pressure oil supplied to the hydraulic motors 4a and 5a is relieved by the relief valve 8 in a state where substantially the same torque is applied. In this state, a rotational force in a direction opposite to the rotating wheel is applied to the upper
Of the pinion 4d, 5d
The backlash between the upper revolving unit 2 and the internal gear 6d is eliminated, so that the rattling of the upper swing body 2 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning device for a construction machine having an upper turning body on a base, such as a crane, a hydraulic shovel, and an aerial work vehicle.

[0002]

2. Description of the Related Art Construction machines such as cranes, hydraulic shovels, and aerial work vehicles have an upper revolving structure rotatable about a vertical axis on a base such as a lower traveling structure. In this type of construction machine, a swing for fixing the upper swing body to an arbitrary swing position is generally provided with a disk brake on an output shaft of a hydraulic motor that swings and drives the upper swing body. It is done by fixing.

[0003] In the turning drive of the upper revolving superstructure by the hydraulic motor, the rotation of the motor output shaft is reduced and transmitted to the pinion by a gear type speed reducer, and the pinion meshes with a ring gear fixed to a base (lower traveling body). Because it is performed by rolling, backlash of the gear meshing part,
Due to the torsional elastic deformation of the shaft in the power transmission path from the motor output shaft to the pinion, and the play of the spline connection part, the upper revolving unit turns with respect to the lower traveling unit even if the motor output shaft is fixed by the disc brake. It is fixed with rattling in the direction. Therefore, when a turning external force acts on the upper revolving unit, the upper revolving unit turns with respect to the lower traveling unit by the amount of the backlash.

For example, in the case of a crane, the wind acting on the swing of the suspended load or the boom acts on the upper revolving unit as a turning external force, and the upper revolving unit rattles and turns. When the upper swing body rattles and swings, the boom provided in the upper swing body also swings, and the swing displacement amount at the boom tip increases as the boom length increases, and the swing displacement amount at the boom tip is 1 m. May also occur. Such rattling turning of the upper turning body causes deterioration of other operability such as winding.

As a countermeasure against this problem, Japanese Patent Laid-Open No. 7-48859 discloses a method of reducing the backlash of the upper revolving structure by reducing the influence of gear backlash in the power transmission system for the revolving drive. In Japanese Patent Publication No. In Japanese Patent Application Laid-Open No. 7-48859, one of a base body and an upper revolving structure is provided with a braking surface portion extending in the revolving direction concentrically with the center of revolving of the upper revolving structure, and the other is selectively frictionally engaged with the braking surface portion. Provide a braking member to
By frictionally engaging the braking surface portion and the braking member, rattling of the upper rotating body due to gear backlash or the like is prevented, and operability such as winding up is improved.

[0006]

However, in the apparatus described in the above-mentioned Japanese Patent Application Laid-Open No. 7-48859, the size of the apparatus is increased due to the increase in the size of the accompanying parts, and the cost is increased. Could not be easily applied to construction machinery that had already flown into the country. An object of the present invention is to provide a swing device of a construction machine that can prevent rattling of an upper swing body without increasing the size of the device.

[0007]

FIG. 1 shows an embodiment of the present invention.
Referring to FIG. 4, the invention of claim 1 includes a base 1, an upper revolving unit 2 provided on the base 1 so as to be pivotable by the revolving wheel 6, and a gear 6 d of the revolving wheel 6 meshed with each other. Are applied to a turning device of a construction machine having first and second driving devices 4 and 5 for turning the upper turning body 2 by turning the upper turning body 2 by applying a rotational force to the turning wheel 6 by the gears 4d and 5d. The above-mentioned object is achieved by providing the second driving devices 4 and 5 with a backlashing means 16 that reversely rotates the second driving devices 4 and 5 to give opposing rotational forces to the turning wheel 6.

According to a second aspect of the present invention, the first and second driving devices 4 and 5 are each controlled by a common control valve 7 to switch the pressure oil from a common hydraulic source 30 to a hydraulic pressure whose driving is controlled synchronously. In addition to the motors 4a and 5a, the backlash means is a switching valve 16 for switching the direction of pressure oil flowing into one of the two hydraulic motors 4a and 5a. According to a third aspect of the present invention, each of the first and second driving devices 4 and 5 is supplied with hydraulic oil from a common hydraulic power source 30 through a common control valve 7.
Hydraulic motor 4 whose drive is switched and controlled synchronously
a and 5a, and the backlash means is shown in FIG.
As shown in FIG. 3, a hydraulic pressure source 3 different from the common hydraulic pressure source 30
1 and two hydraulic motors 4a,
5a, and a switching valve 17 for flowing pressure oil into one of the valves 5a.

Referring to FIG. 8 to FIG. 10, the invention according to claim 4 is based on a base 1, an upper revolving unit 2 provided on the base 1 so as to be able to turn by the turning wheel 6, and a gear of the turning wheel 6. 6d
And a driving device 5 that applies a rotational force to the revolving wheel 6 by means of a gear 4d meshing with the revolving wheel 6 to revolve and drive the upper revolving unit 2. The braking device meshes with the gear 6 d of the revolving wheel 6. The above-mentioned object is achieved by providing the gear 4d and the braking means 4b for braking the rotation of the braking gear 4d.

Referring to FIGS. 11 to 14, the invention according to claim 5 is based on a base 1, an upper revolving unit 2 provided on the base 1 so as to be pivotable by the revolving wheel 6, and a gear of the revolving wheel 6. 6
The first and second driving devices 4 and 5, which apply a rotational force to the revolving wheel 6 by the respective gears 4d and 5d meshing with the driving device d to revolve the upper revolving unit 2, and the first and second driving devices 4 ,
The present invention is applied to a turning device of a construction machine having first and second brake devices 4b and 5b for braking the rotation shafts of the fifth and fifth shafts, respectively, and corresponds to one of the first and second drive devices 4 and 5. The above-mentioned object is achieved by providing a backlash means for rotating only the other drive device 5 while braking with the brake device 4b.

According to a sixth aspect of the present invention, the first and second driving devices 4 and 5 are controlled by a common control valve 7 to switch hydraulic oil from a common hydraulic power source 30 to control the driving thereof in a synchronized manner. The first and second brake actuating means 14A, 14 which are constituted by the motors 4a, 5a and which actuate the first and second brake devices 4b, 5b.
B, a hydraulic pressure source 31 different from the common hydraulic pressure source 30, and a first brake device 4b by the first brake activation means 14A.
Is switched to the position a where the hydraulic oil flows into the second hydraulic motor 5a from another hydraulic source 31 in conjunction with the activation of the second hydraulic motor 5a, and in conjunction with the activation of the second brake device 5b by the second brake activation means 14B. And a switching valve 17 that switches to a position b where the flow of pressure oil from another hydraulic source 31 is shut off. According to a seventh aspect of the present invention, as shown in FIG. 14, the switching valve 17 is switched to the hydraulic oil inflow position a in response to the operation of the first brake activation means 14A, and after a predetermined time has elapsed, the switching valve 17 is It is provided with automatic clearance means 23 for switching to the cut-off position b and operating the second brake device 14b.

According to the first aspect of the present invention, when the turning wheel 6 stops rotating, the backlash means 16 causes the first and second driving devices 4 and 5 to rotate in the opposite directions to each other to rotate the turning wheel 6 in opposition to the turning device. Empower. And by this, the gear 6d and the gear 4
The backlash of d and 5d is removed, and the rotation of the turning wheel 6 when the upper turning body 2 is stopped is prevented. Claim 2
According to the invention, by switching the switching valve 16,
The direction of the pressure oil flowing from the hydraulic source 30 to one of the hydraulic motors 4a, 5a is switched.
a and 5a rotate in opposite directions to rotate the gear 6d and the gear 4
The backlash of d and 5d is removed.

According to the third aspect of the invention, by switching the switching valve 17, the hydraulic motor 4a,
The direction of the pressure oil flowing into one of the gears 5a is switched, whereby the hydraulic motors 4a and 5a rotate in opposite directions to eliminate the backlash between the gear 6d and the gears 4d and 5d. According to the invention of claim 4, when the turning of the turning wheel 6 is stopped, the braking means 4b brakes the rotation of the braking gear 4d in a state where the driving force is applied to the turning wheel 6 by the driving device 5. Thereby, the backlash between the gear 6d and the gear 4d is removed. According to the invention of claim 5, one of the braking devices 4b, 5
b, and only the other driving means 5 is rotated. Thereby, the backlash between the gear 6d and the gears 4d, 5d is eliminated.

According to the invention of claim 6, by switching the control valve 7, the hydraulic motor 4a, 5
a, the direction of the pressure oil flowing into the hydraulic motor 4 is changed.
a and 5a rotate. When the turning of the turning wheel 6 is stopped, when the first brake device 4b is started by the first brake starting means 14A, the switching valve 17 is switched, and the hydraulic oil is supplied from the hydraulic source 31 to the second hydraulic motor 5a. Flows in. As a result, the second hydraulic motor 5a rotates while the first hydraulic motor 4a is stopped, so that the backlash between the gear 6d and the gears 4d, 5d is removed,
Thereafter, the second brake device 5b is activated to stop driving the second hydraulic motor 5a. According to the invention of claim 7,
When the turning of the turning wheel 6 is stopped, the automatic rattling means 23
As a result, the switching valve 17 is switched to the pressure oil inflow position in response to the operation of the brake activation means 14A, and the hydraulic motor 5a
Is reversed. Then, after a lapse of a predetermined time,
The switching valve 17 is switched to the pressure oil cutoff position, and the second brake device 14b operates to stop the turning wheel 6. Thereby, the backlash between the gear 6d and the gears 4d, 5d is eliminated.

In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used for easy understanding of the present invention. However, the present invention is not limited to this.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a crane to which an embodiment of the present invention is applied. As shown in FIG. 1, this crane has a lower traveling body 1 as a base.
The upper revolving unit 2 is rotatable about a vertical axis via a revolving wheel 6 above. A boom 3 is provided on the upper swing body 2. FIG. 2 is a diagram illustrating a configuration of a turning device provided in the crane. As shown in FIG. 2, an annular slewing wheel inner race 6 b is fixedly mounted on a frame 23 of the lower traveling body 1 by a mounting bolt 22 concentrically with the center of rotation of the upper slewing body 2. The frame 24 of the upper swing body 2 includes
A turning wheel outer race 6a is fixedly mounted by mounting bolts 21 concentrically with the turning center. The turning wheel outer race 6a is arranged outside the turning wheel inner race 6b, and a plurality of rolling elements 6c are provided between the outer race 6a and the inner race 6b. Thereby, the upper revolving unit 2 is guided by the rolling bearing structure composed of the inner race 6b, the outer race 6a, and the rolling element 6c, and revolves around the vertical axis with respect to the lower traveling unit 1.

The upper swing body 2 is equipped with two swing devices 4 and 5. The turning devices 4 and 5 include hydraulic motors 4a,
5a, hydraulic brake devices 4b, 5b composed of mechanical disc brakes operated by hydraulic pressure, reduction gears 4c, 5c composed of multi-stage planetary gears, and a pinion attached to the tip of the output shaft of the reduction gears 4c, 5c. 4d and 5d. As shown in FIG. 3, the pinions 4d and 5d are formed on the internal gear 6 formed on the inner peripheral surface of the inner race 6b of the turning wheel.
is engaged with d. The hydraulic brake devices 4b, 5b
Has a structure in which the brake is released when pressure oil is supplied, and the brake is activated when pressure oil is not supplied. Next, an embodiment of a hydraulic circuit for driving the turning devices 4 and 5 will be described.

First Embodiment FIG. 4 is a hydraulic circuit diagram of a turning device according to a first embodiment of the present invention, showing a case where a turning brake is operated. As shown in FIG. 4, the hydraulic circuit according to the first embodiment includes a hydraulic pump 9, a relief valve 8, and a tank 1
0A motor hydraulic source 30 and motor hydraulic source 3
A first switching valve (control valve) 7 for adjusting the direction and flow rate of the pressure oil supplied to the hydraulic motors 4a and 5a from 0, and provided in a pipeline between the first switching valve 7 and the hydraulic motor 5a. The second switching valve 16 for switching the direction of the pressure oil supplied to the hydraulic motor 5a and supplied to the hydraulic motor 5a, the hydraulic pressure source 31 for brake composed of the hydraulic pump 11, the relief valve 12, and the tank 10B, and the hydraulic brake devices 4b and 5b A third switching valve 13 for switching the direction of the pressure oil to be supplied. The first and second switching valves 7 and 16 are switching valves that are manually switched, while the third switching valve 13 is an electromagnetic switching device that switches a current supplied from a power supply 15 by turning a switch 14 on and off. It is a switching valve.

Next, the operation of the first embodiment will be described. First, when turning the upper-part turning body 2, the switch 14 is operated to the brake-off side to operate the third switching valve 1.
3 is switched to the position b to supply the hydraulic oil from the brake hydraulic source 31 to the hydraulic brake devices 4b and 5b to release the braking by the hydraulic brake devices 4b and 5b. Then the second
When the first switching valve 7 is switched to the a position or the b position in a state where the switching valve 16 of FIG.
a, 5a to rotate the hydraulic motors 4a, 5a and transmit this rotational force to the internal gear 6d of the inner race 6b of the revolving wheel via the pinions 4d, 5d. Let it.

On the other hand, when stopping the upper rotating body 2,
First, the first switching valve 7 is switched to the neutral position to stop the supply of the pressure oil from the motor hydraulic source 30 to the hydraulic motors 4a and 5a. Next, as shown in FIG. 5, the second switching valve 16 is switched to the a position, and the first switching valve 7 is switched to the a position or the b position. Thereby, the hydraulic motors 4a and 5a rotate in different rotation directions, respectively.
In a state where substantially the same torque acts, the hydraulic motor 4
The pressure oil supplied to a and 5a is relieved by a relief valve 8. In this state, the backlash R5 formed between the pinions 4d, 5d and the internal gear 6d as shown in FIG. 7B is removed as shown in FIG. 7A. In this state, as shown in FIG. 6, the switch 14 is operated to the brake-on side to operate the third switching valve 1.
3 is switched to the a side. Thereby, the supply of the pressure oil from the hydraulic pressure source 31 for the brake to the hydraulic brake devices 4b, 5b is stopped, the hydraulic brake devices 4b, 5b are operated, and the rotation of the pinions 4d, 5d is stopped. Thereafter, the first switching valve 7 is returned to the neutral position.

In the first embodiment, the first to third switching valves 7, 16, and 13 are switched in this manner to apply a rotational force in a direction opposite to the turning wheel inner race 6b to turn the upper turn. Since the turning of the body 2 is stopped, the backlash between the pinions 4d, 5d and the internal gear 6d is eliminated, whereby the rattling of the upper turning body 2 can be prevented, and the upper revolving body 2 can be prevented from winding. Operation can be performed stably. Further, in the first embodiment, the second
By merely providing the switching valve 16 between the first switching valve 7 and the hydraulic motor 5a, it is possible to prevent rattling of the upper revolving unit 2 and thus the device described in Japanese Patent Application Laid-Open No. 7-48859 is used. Thus, the apparatus can be configured at a low cost without increasing the size of the apparatus.

-Second Embodiment- Next, a second embodiment of the present invention will be described.
FIG. 8 is a hydraulic circuit diagram of the turning device according to the second embodiment of the present invention. The first embodiment and the second embodiment are different from the second embodiment in that only the hydraulic motor 5a is used to swing the upper swing body 2 in the second embodiment. That is, in FIG. 8, the swing motor 4a is eliminated, and the input shaft of the speed reducer 4c is controlled by the hydraulic brake device 4b.

Next, the operation of the second embodiment will be described with reference to FIG. First, when the upper revolving unit 2 is turned, the switch 14 is operated to the brake off side to switch the third switching valve 13 to the position b, and the hydraulic oil from the hydraulic pressure source 31 for the brake is supplied to the hydraulic brake devices 4b, 4b. 5b to release the hydraulic brake devices 4b and 5b,
With the second switching valve 16 in the position b, the first switching valve 7
Is switched to the a position or the b position, the hydraulic oil from the motor hydraulic source 30 is supplied to the hydraulic motor 5a to rotate the hydraulic motor 5a, and this rotational force is applied to the turning wheel inner race 6b via the pinion 5d. This is transmitted to the internal gear 6d, and thereby the upper rotating body 2 is rotated.

On the other hand, when stopping the upper rotating body 2,
First, the first switching valve 7 is switched to the neutral position to stop the supply of the pressure oil from the motor hydraulic source 30 to the hydraulic motor 5a. Next, the second switching valve 16 is switched to the position a, the first switching valve 7 is switched to the same position as before the stop, and the hydraulic oil is supplied to the hydraulic motor 5a.
a is rotated in the opposite direction to that before stopping. In this state,
The pinion 4d is rotating in the same direction as before stopping due to inertia, and the pinion 5d is rotated in the opposite direction to that before stopping, so that rotational forces in opposite directions act on the internal gear 6d. Then, in a state where the hydraulic motor 5a is slightly rotated, the switch 14 is operated to the brake-on side to operate the hydraulic brake devices 4b and 5b, and the pinions 4d and 5d are operated.
Stop the rotation of. Thereafter, the first switching valve 7 is returned to the neutral position.

In the second embodiment, the first to third switching valves 7, 16, and 13 are switched in this manner to apply a rotational force in a direction opposite to the turning wheel inner race 6b, thereby turning the upper wheel upward. Since the turning of the body 2 is stopped, the upper turning body 2 stops the turning in a state where the backlash between the pinions 4d, 5d and the internal gear 6d is removed in one direction. As a result, it is possible to prevent rattling of the upper swing body 2 and to stably perform operations such as hoisting. Further, in the second embodiment, the second switching valve 16 is connected to the first switching valve 7 and the hydraulic motor 5.
a), the rattling of the upper swing body 2 can be prevented, so that the apparatus does not increase in size as in the apparatus described in JP-A-7-48859.
In addition, the apparatus can be configured at low cost.

Third Embodiment In the second embodiment, the hydraulic motor 5a is driven by switching the second switching valve 16 when the upper revolving unit 2 stops rotating. As in the third embodiment shown in FIG. 9, without using the second switching valve 16,
When the upper swing body 2 stops rotating, the rattling of the upper swing body 2 can be prevented by switching only the first switching valve 7. That is, when stopping the upper revolving unit 2, first, the first switching valve 7 is switched to the neutral position, and the supply of the pressure oil from the motor hydraulic source 30 to the hydraulic motor 5a is stopped. Next, the first switching valve 7 is switched to a position opposite to the position before the stop, to supply the hydraulic oil to the hydraulic motor 5a, and the hydraulic motor 5a rotates in the opposite direction to that before the stop. In this state, the pinion 4d is rotating in the same direction as before stopping due to inertia, and the pinion 5d is rotated in the opposite direction to that before stopping, so that rotational forces in opposite directions act on the internal gear 6d. . Then, while the hydraulic motor 5a is slightly rotated, the switch 14 is operated to the brake-on side to operate the hydraulic brake devices 4b and 5b to stop the rotation of the pinions 4d and 5d. Then the first
Is returned to the neutral position. Thus, as in the second embodiment, it is possible to prevent rattling of the upper-part turning body 2 and to stably perform operations such as hoisting.

In the second and third embodiments, the pinion 4d may be controlled by the hydraulic brake device 4b without the speed reducer 4c as shown in FIG.

-Fourth Embodiment- Next, a fourth embodiment of the present invention will be described.
FIG. 11 is a hydraulic circuit diagram of a turning device according to a fourth embodiment of the present invention, and FIGS. 12 and 13 are hydraulic circuit diagrams for explaining the operation of the fourth embodiment. The first embodiment and the fourth embodiment are different from the fourth embodiment in that the second switching valve 16 is replaced by an electromagnetic switching valve 17 (hereinafter referred to as a sixth switching valve 17) in the fourth embodiment. When the sixth switching valve 17 is at the position b, the pressure oil from the motor hydraulic source 30 is supplied to the hydraulic motor 5a in accordance with the switching position of the first switching valve 7, and the sixth switching valve When the position 17 is at the position a, the point that the hydraulic oil supplied from the hydraulic pump 11 via the check valve 25 is supplied to the hydraulic motor 5a, and that the hydraulic brake devices 4b and 5b are respectively operated. When the fourth and fifth switching valves 13A and 13B are provided and the first switch 14A is operated to the brake off side, the fourth switching valve 13A switches to the position b to release the hydraulic brake device 4b, 6 switching valve 1
7 is switched to the position b, and when the second switch 14B is operated to the brake off side, the fifth switching valve 13B is switched to the position b to release the hydraulic brake device 5b. .

Next, the operation of the fourth embodiment will be described. First, a description will be given with reference to FIG. When the upper swing body 2 is swung, the first and second switches 14A, 14A,
14B is operated to the brake off side to switch the fourth and fifth switching valves 13A and 13B to the position b, respectively, so that the hydraulic oil from the hydraulic pressure source 31 for the brake is applied to the hydraulic brake devices 4b and 4b.
5b to release the hydraulic brake devices 4b and 5b and switch the sixth switching valve 17 to the b position. Then, the first switching valve 7 is switched to the position “a” or the position “b”, and the hydraulic oil from the motor hydraulic power source 30 is supplied to the hydraulic motor 4.
a, 5a to rotate the hydraulic motors 4a, 5a and transmit this rotational force to the internal gear 6d of the inner race 6b of the revolving wheel via the pinions 4d, 5d. Let it.

On the other hand, when stopping the upper rotating body 2,
As shown in FIG. 12, first, the first switching valve 7 is switched to the neutral position, and the hydraulic motor 4a,
The supply of the pressure oil to 5a is stopped. Next, the first switch 14A is operated to the brake-on side to operate the fourth switching valve 13.
When the A and the sixth switching valve 17 are respectively switched to the a position, the supply of the pressure oil to the hydraulic brake device 4b is stopped,
The hydraulic brake device 4b operates to brake the hydraulic motor 4a, and the hydraulic oil from the hydraulic pump 11 is supplied to the hydraulic motor 5a via the sixth switching valve 17. As a result, the hydraulic motor 5a rotates, but the rotation of the hydraulic motor 4a is prevented, so that the hydraulic motor 5a slightly rotates.
It is relieved by 2. As a result, rotational forces act in opposite directions on the internal gear 6d, so that the pinion 4
Backlash formed between d, 5d and the internal gear 6d is eliminated. Thereafter, as shown in FIG.
By operating the switch 14B to the brake-on side, the supply of the pressure oil to the hydraulic brake device 5b is stopped, the hydraulic brake device 5b is operated, and the rotation of the pinion 5d is stopped.

In the fourth embodiment, the first and second switches 14A and 14B are operated, and the fourth, fifth and sixth switching valves 13A, 13B and 1 are operated.
7, the turning of the upper turning body 2 is stopped by applying a rotational force in a direction opposite to the turning wheel inner race 6b, so that the backlash between the pinions 4d, 5d and the internal gear 6d is reduced. Thus, the rattling of the upper swing body 2 can be prevented, and operations such as winding can be performed stably.

Fifth Embodiment Next, a fifth embodiment of the present invention will be described.
FIG. 14 is a hydraulic circuit diagram of a turning device according to a fifth embodiment of the present invention. The fifth embodiment is a modification of the fourth embodiment. In the fifth embodiment and the fourth embodiment, a first switch 14A is used instead of the second switch 14B. When the brake valve is operated to the brake off side, the fifth switching valve 13B is immediately switched to the position b to stop the supply of the hydraulic oil to the hydraulic brake device 5b to release the braking by the hydraulic brake device 5b, and the first switch 14A When the brake is operated to the brake-on side, the fifth
This is different from the first embodiment in that a timer 23 for switching the switching valve 13B to the position a to discharge the hydraulic oil of the hydraulic brake device 5b to the tank and to operate the hydraulic brake device 5b is provided.

Next, the operation of the fifth embodiment will be described. First, when the upper revolving unit 2 is turned, the first switch 14A is operated to the brake off side to switch the fourth and fifth switching valves 13A and 13B to the position b, respectively, and the brake hydraulic power source 31 Is supplied to the hydraulic brake devices 4b and 5b, and the hydraulic oil is supplied to the hydraulic brake devices 4b and 5b.
The braking by b is released, and the sixth switching valve 17 is switched to the b position. Then, the first switching valve 7 is switched to the a position or the b position to supply the hydraulic oil from the motor hydraulic source 30 to the hydraulic motors 4a and 5a,
a, 5a to rotate the pinion 4d, 5
The rotation is transmitted to the internal gear 6d of the revolving wheel inner race 6b through the upper revolving body d, thereby revolving the upper revolving unit 2.

On the other hand, when stopping the upper rotating body 2,
First, the first switching valve 7 is switched to the neutral position to stop the supply of the pressure oil from the motor hydraulic source 30 to the hydraulic motors 4a and 5a. Next, when the first switch 14A is operated to the brake-on side to switch the fourth switching valve 13A and the sixth switching valve 17 to the respective a positions, the supply of the hydraulic oil to the hydraulic brake device 4b is stopped, Hydraulic brake device 4b
Operates to brake the hydraulic motor 4a, and the hydraulic oil from the hydraulic pump 11 is supplied to the hydraulic motor 5a via the sixth switching valve 17. Thereby, the hydraulic motor 5a
Rotates, but since the rotation of the hydraulic motor 4a is prevented, the hydraulic motor 5a slightly rotates, and then the pressure oil from the hydraulic pump 11 is relieved by the relief valve 12. Thus, as in the fourth embodiment, the backlash formed between the pinions 4d, 5d and the internal gear 6d is eliminated. Thereafter, after a predetermined time has elapsed, the timer 23 is operated, the fifth switching valve 13B is switched to the position a, the hydraulic brake device 5b is operated, and the pinion 5
Brakes d.

In the fifth embodiment, the first switch 14A is operated as described above, and the fourth, fifth and sixth switching valves 13A, 13B and 17 are switched.
Since the turning of the upper turning body 2 is stopped by applying a rotational force in a direction opposite to the turning wheel inner race 6b,
Backlash between the pinions 4d, 5d and the internal gear 6d is removed, thereby preventing rattling of the upper revolving superstructure 2 and stably performing operations such as hoisting. Further, since the fifth switching valve 13B is switched by the timer 23 only by switching the first switch 14A, the second switch 1A is operated after the operation of the first switch 14A as in the fourth embodiment.
There is no need to operate the 4B, and the stopping operation of the upper swing body 2 can be easily performed. In the above embodiment, the gear is formed on the inner peripheral surface of the inner race 6b, but the gear may be formed on the outer peripheral surface of the outer race 6a.

In the correspondence between the above-described embodiment and the claims, the lower traveling body 1 is a base, the internal gear 6d is a gear of the turning wheel 6, the turning devices 4 and 5 are a driving device, and the hydraulic brake device 4b , 5b serve as the second switching valve 16, the third switching valve 13, the fourth and fifth switching valves 13A, 13B.
B, the switch 14 and the sixth switching valve constitute a play means, and the timer 23 constitutes an automatic play means.

[0037]

According to the first to third aspects of the present invention, the first and second driving devices for revolvingly driving the upper revolving unit are rotated in opposite directions to give opposing rotational forces. The play between the wheel and the turning wheel can be performed with a simple configuration. According to the fourth aspect of the present invention, since the upper revolving unit is swiveled with the braking gear meshing with the gear of the swivel wheel in a braking state, the play between the gear and the swivel wheel is performed. , Can be performed with a simple configuration. According to the fifth and sixth aspects of the present invention, one of the first and second driving devices for rotatingly driving the upper revolving unit is driven while the other is being braked to remove the clearance between the gear and the revolving wheel. Since this is performed, the play can be performed with a simple configuration. According to the seventh aspect of the present invention, one of the hydraulic motors is driven in response to the operation of the first brake activation means, and the second brake device is operated after a predetermined time elapses. Since the two hydraulic motors are braked, the play can be easily performed only by operating one of the brake devices.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a crane to which an embodiment of the present invention is applied.

FIG. 2 is a diagram showing a configuration of a turning device provided in the crane.

FIG. 3 is a diagram showing an engagement state between an internal gear and a pinion;

FIG. 4 is a hydraulic circuit diagram of the swivel device according to the first embodiment of the present invention.

FIG. 5 is a hydraulic circuit diagram showing an operation state of the turning device according to the first embodiment of the present invention.

FIG. 6 is a hydraulic circuit diagram showing an operating state of the turning device according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a state in which backlash is removed.

FIG. 8 is a hydraulic circuit diagram of a turning device according to a second embodiment of the present invention.

FIG. 9 is a hydraulic circuit diagram of a turning device according to a third embodiment of the present invention.

FIG. 10 is a hydraulic circuit diagram of a modification of the second and third embodiments.

FIG. 11 is a hydraulic circuit diagram of a turning device according to a fourth embodiment of the present invention.

FIG. 12 is a hydraulic circuit diagram for explaining the operation of the fourth embodiment.

FIG. 13 is a hydraulic circuit diagram for explaining the operation of the fourth embodiment.

FIG. 14 is a hydraulic circuit diagram of a turning device according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure 3 Boom 4, 5 Revolving device 4a, 5a Hydraulic motor 4b, 5b Hydraulic braking device 4c, 5c Reduction gear 4d, 5d Pinion 6 Revolving wheel 6a Revolving wheel outer race 6b Revolving wheel inner race 7,13 , 13a, 13b, 16, 17 switching valve 14, 14A, 14B switch 23 timer

Claims (7)

[Claims] 1. An upper revolving structure provided on a base body so as to be revolvable by a revolving wheel, and a rotational force applied to the revolving wheel by respective gears meshing with gears of the revolving wheel to provide the upper revolving structure. The first to drive the swing
A turning device for a construction machine comprising: a first drive device and a second drive device, wherein the first drive device and the second drive device are rotated in opposite directions to each other to apply an opposing torque to the turning wheel. And turning equipment for construction machinery. 2. The apparatus according to claim 1, wherein each of the first and second driving devices includes a hydraulic motor whose driving is synchronously controlled by switching pressure oil from a common hydraulic source by a common control valve, and The turning device for a construction machine according to claim 1, wherein the means is a switching valve that switches a direction of pressure oil flowing into one of the two hydraulic motors. 3. The first and second driving devices each include a hydraulic motor whose driving is synchronously controlled by switching pressure oil from a common hydraulic source by a common control valve, and wherein the rattling is performed. The means comprises a hydraulic pressure source different from the common hydraulic pressure source, and a switching valve for flowing pressurized oil from the different hydraulic pressure source to one of the two hydraulic motors. The turning device for a construction machine according to claim 1. 4. An upper revolving body pivotally provided on the substrate by a revolving wheel, and a rotational force applied to the revolving wheel by a gear meshing with a gear of the revolving wheel to revolve the upper revolving body. A turning device for a construction machine comprising: a driving device that drives; a braking gear that meshes with a gear of the turning wheel; and a braking unit that brakes rotation of the braking gear. Swivel device. 5. An upper revolving body provided on the substrate so as to be revolvable by a revolving wheel, and a rotational force applied to the revolving wheel by respective gears meshing with gears of the revolving wheel to provide the upper revolving body. The first to drive the swing
And a second drive device, and a first and second brake device for braking the rotating shafts of the first and second drive devices, respectively. A turning device for a construction machine, comprising: a backlash means for rotating only one of the driving devices while braking the other driving device with a corresponding brake device. 6. The first and second driving devices each include a hydraulic motor whose driving is controlled synchronously by switching hydraulic oil from a common hydraulic source by a common control valve. Means, first and second brake activation means for operating the first and second brake devices; a hydraulic pressure source different from the common hydraulic pressure source; In response to the activation of the brake device, the position is switched to a position at which pressure oil flows from the another hydraulic source to the second hydraulic motor, and in response to activation of the second brake device by the second brake activation means. The turning device for a construction machine according to claim 5, further comprising: a switching valve that switches to a position where the inflow of pressure oil from another hydraulic source is shut off. 7. The switching valve is switched to a pressure oil inflow position in response to an operation of the first brake activation means, and after a predetermined time elapses, the switching valve is switched to a pressure oil shutoff position and the second brake is switched. The turning device for a construction machine according to claim 6, further comprising an automatic play means for operating the device.