JP3251652B2 - Winch control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winch control device suitable for being mounted on a hydraulic crawler crane used for crane work or clamshell work.

[0002]

2. Description of the Related Art As a conventional winch control device of this type, for example, a device disclosed in Japanese Patent Publication No. 2-41509 is known. As shown in FIG. 3, this device includes a hydraulic motor 51 and an output shaft 5 of the hydraulic motor 51.
1a, and a winch drum 53 integral with a ring gear 52a of the planetary reduction mechanism 52.
And a clutch drum 55 integrated with the carrier shaft 54 of the planetary reduction mechanism 52. Reference numeral 60 denotes a brake device, and the hydraulic motor 51
Of the output shaft 51a. Reference numeral 70 denotes a clutch device, which has a clutch band 71 having a lining attached to the inner peripheral surface thereof, and tightens the clutch band 71 to the clutch drum 55 in response to operation of the clutch pedal PD, thereby preventing the clutch drum 55 from rotating.

Now, when the clutch pedal PD is depressed to stop the rotation of the clutch drum 55 by the clutch device 70 and then the switching valve 83 is operated by the operating lever 81, the oil discharged from the hydraulic pump 82 is passed through the switching valve 83. Guided by the hydraulic motor 51, the shuttle valve 8
The brake cylinder 61 contracts due to the pressure in the pipe line 91 or 92 selected by 4 and the brake device 60 is released. Thus, the rotation of the hydraulic motor 51 is transmitted to the planetary reduction mechanism 52 via the output shaft 51a. At this time, the rotation of the output shaft 51a is transmitted to the winch drum 53 via the ring gear 52a due to the nature of the planetary reduction mechanism 52, since the rotation of the clutch drum 55, that is, the carrier shaft 54 is prevented by the clutch device 70. , The winch drum 53 rotates, and the winding or the lowering is performed. When the switching valve 83 is returned to the neutral position by the operating lever 81 in this state, the oil discharged from the hydraulic pump 82 is not guided to the hydraulic motor 51, so that the hydraulic motor 51 stops and the pressure in the pipe 91 or 92 decreases. Accordingly, the brake cylinder 61 is extended by the spring 61a, and the brake device 60 is brought into a braking state. As a result, hoisting and lowering are stopped.

When the operation of the clutch pedal PD is loosened while the switching valve 83 is in the neutral state, the clutch device 70 is released, and the rotation of the clutch drum 55, that is, the carrier shaft 54, is permitted. The winch drum 53 and the clutch drum 55 rotate integrally in the lowering direction by their own weight, so that a so-called free fall is performed. When the clutch pedal PD is depressed by a predetermined amount or more during the free fall, the clutch device 70 enters a braking state, the clutch band 71 is wound around the clutch drum 55, and braking is applied to the clutch drum 55. As a result, the winch drum 51 is also braked via the carrier shaft 54 and the planetary reduction mechanism 52, and the winch drum 51 stops. Since the clutch device 70 functions as a brake during a free fall, the device 70 may be referred to as a clutch and brake device or simply as a brake device.

[0005]

As described above, in the conventional device, when the clutch pedal is operated during the free fall, only the clutch device 70 is brought into the braking state. Can only dissipate heat. Therefore, the temperature of the clutch drum 55 becomes high,
The lining attached to the inner peripheral surface side of the clutch band 71 wears quickly, and the lining replacement frequency increases. To prevent this, it is conceivable to increase the outer diameter of the clutch drum 55 to increase the heat radiation area during braking. However, in this case, there is a problem that the device becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a winch control device in which the heat radiation performance during braking is improved without increasing the outer diameter of the brake drum or winch drum.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2 showing an embodiment, the present invention relates to a hydraulic motor 2 and an output shaft 2a connected to an output shaft 2a of the hydraulic motor 2. A planetary reduction mechanism 3 for reducing the rotation of the motor, a winch drum 1 integrated with one of the ring gear 3a and the carrier shaft 4 of the planetary reduction mechanism 3, and a winch drum 1
Brake device 10 for braking the gear, and ring gear 3a
And a clutch and brake drum 5 integrated with one of the carrier shafts 4 separate from the winch drum 1
And a second brake device 20 for braking the clutch-and-brake drum 5. The first brake device 1
0 is released and the second brake device 20 is in the braking state, the hydraulic motor 2 performs the hoisting and lowering. If both the first brake device 10 and the second brake device 20 are in the released state, a free fall occurs. Applied to winch control device to be performed. Then, the first brake device 10
And a first interlocking means 40 for bringing the second brake device 20 into a braking state in conjunction with the operation of the brake operation member PD, thereby solving the above problem. In particular, according to the invention of claim 2, a motor operating means 32 for instructing the rotation of the hydraulic motor 2 and the second brake device 20 are brought into a braking state in conjunction with a rotation instruction operation of the hydraulic motor 2 by the motor operating means 32. At the same time, the second interlocking means 36, 37 for releasing the braking of the second brake device 20 when the motor operating means 32 is neutral.
It is provided with.

[0008]

When the brake operating member PD is operated during a free fall, both the first brake device 10 for braking the winch drum 1 and the second brake device 20 for braking the clutch and brake drum 5 are brought into the braking state.
As a result, the braking force is shared between the winch drum 1 and the clutch and brake drum 5, and the amount of sliding friction heat generated between the drums 1 and 5 during braking is reduced. Therefore, lining wear can be suppressed, the frequency of replacement can be reduced, and braking force can be increased.

In the means and means for solving the above problems which explain the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0010]

1 and 2, an embodiment of the present invention will be described. FIG. 2 is a sectional view showing a part of a winch control device according to the present invention, and FIG. 1 is a diagram showing a configuration of a brake device and a hydraulic circuit. In FIG. 2, reference numeral 1 denotes a winch drum rotatably supported and having a braking portion 1a, 2 denotes a hydraulic motor for driving the winch drum, and 3 denotes a motor provided inside the winch drum 1 for rotating the output shaft 2a of the hydraulic motor 2. This is a planetary reduction mechanism that decelerates. The planetary reduction mechanism 3 includes a ring gear 3 a integrally provided on the inner peripheral surface of the winch drum 1,
Sun gear 3b connected to output shaft 2a of hydraulic motor 2
A planetary gear 3c meshing with the sun gear 3b and the ring gear 3a, a sun gear 3e connected to a carrier shaft 3d of the planetary gear 3c, and a sun gear 3e and the ring gear 3a.
And a planetary gear 3f that meshes with the planetary gear 3f. The planetary gear 3f is connected to the carrier shaft 4. Reference numeral 5 denotes a clutch and brake drum connected to the carrier shaft 4. When the drum 5 is braked by a clutch and brake band 21 on the outer peripheral surface of the drum 5 to prevent the rotation of the carrier shaft 4, the winch drum 1 is moved. Power can be hoisted and lowered. On the other hand, if the braking of the drum 5 is released and the rotation of the carrier shaft 4 is made free, the winch drum 1 can fall free. Reference numeral 6 denotes a brake device that brakes the output shaft 2a of the hydraulic motor 2 similarly to the brake device 60 shown in FIG. 3, and BE1, BE2, and BE3 are bearings, except that the winch drum 1 is provided with a brake unit 1a. The basic structure is the same as the winch of FIG.

The reference numeral 10 in FIG.
The first brake device 10 includes a brake band 11 wound around an outer peripheral surface of a braking portion 1a of the winch drum 1, and a lining 12 is attached to an inner peripheral surface of the brake band 11. One end of the brake band 11 is fixed via the lever 13 and the bracket 14, and the other end is attached to one end of the lever 15. Lever 15
A spring 16 is rotatably supported at the tip of the bracket 14.
In the clockwise direction, that is, the direction in which the brake band 11 is loosened. One end of a rod 17 is connected to the other end of the lever 15, and a brake lever 19 is rotatably connected to the other end of the rod 17.
A brake pedal PD is attached to the end of the brake pedal 9. When the brake pedal PD is depressed, the lever 19,
The lever 15 rotates counterclockwise via the rod 17, the brake band 11 is tightened to the brake drum 5, and the winch drum 1 is braked. When the operation of the pedal PD is stopped, the brake band 1
1 is loosened and braking is released.

On the other hand, reference numeral 20 denotes a second brake device,
The second brake device 20 has a clutch and brake band 21 wound around the outer peripheral surface of the clutch and brake drum 5, and a lining 22 is attached to the inner peripheral surface of the band 21 in the same manner as described above. ing. One end of the band 21 is fixed via a lever 23 and a bracket 24, and the other end is attached to one end of a lever 25. The lever 25 is rotatably supported by the tip of the bracket 24, and is urged clockwise by a spring 26. The other end of the lever 25 is connected to a piston rod 27A of the clutch cylinder 27. That is, a bracket 27 having an elongated hole 27a is provided at the tip of the piston rod 27A.
B is attached, and the pin 2 of the lever 25 is
5a is engaged.

When pressure oil is being supplied to the rod chamber of the clutch cylinder 27, the piston rod 27A is in a contracted state, and the band 21 is loosened with respect to the clutch and brake drum 5 via the lever 25. (The clutch is off). On the other hand, when the rod chamber is communicated with the tank, the piston rod 27A is extended by the spring 27b, and the lever 25 is moved by the spring 2b.
The band 21 is rotated clockwise by the urging force of 6, so that the band 21 is tightly wound around the clutch and brake drum 5 (the clutch is in the on state).

A rod 28 is connected to the other end of the lever 25, and one end of a lever 29 is connected to the other end of the rod 28. The lever 29 is configured to operate in cooperation with the brake lever 19 on the first brake device side by a link mechanism 40. Therefore, when the brake pedal PD is depressed in a state where the piston rod 27A of the clutch cylinder 27 is contracted (clutch off, in other words, the second brake device 20 is released), the rod 28 via the link mechanism 40 is depressed. Is pulled, and the rotation of the lever 25 puts the second brake device 20 into a braking state. When the lever 25 rotates, the pin 25a moves through the long hole 27a of the bracket 27B, so that the expansion and contraction of the clutch cylinder 27 is not affected at all.

Next, a hydraulic circuit for driving the winch drum 1 and the second brake device 20 will be described. In FIG. 1, reference numeral 31 denotes a hydraulic pump for operation,
The discharge oil is supplied to a pressure reducing valve 33 operated by an operating lever (motor operating means) 32 and a pilot line 38a,
The control valve 3 is guided to pilot ports 34a and 34b of the hydraulic pilot control valve 34 through the control valve 3b.
4 is switched. When the control valve 34 is switched to the A position or the B position, the discharge oil from the hydraulic pump 35 is guided to the hydraulic motor 2 via the control valve 34 and the counter balance valve 39, and the hydraulic motor 2 rotates. On the other hand, the discharge oil of the operating hydraulic pump 31 is also guided to the rod chamber of the clutch cylinder 27 via the switching valve 36. A shuttle valve 37 selects a pressure on the high pressure side of the pilot lines 38a and 38b. The selected pressure is guided to a pilot port 36a of the switching valve 36.

Next, the operation of the embodiment will be described. When the operation lever 32 is at the neutral position, the control valve 34 holds the neutral position N, and the hydraulic motor 2 is stopped. At this time, since the pressures in the pilot lines 38a and 38b are both low, the switching valve 36 holds the position a, the discharge oil of the operating hydraulic pump 31 is guided to the rod chamber of the clutch cylinder 27, and the clutch and brake drum 5, the clutch and brake band 21 is not tightly wound. Therefore, the clutch is off, that is, the second brake device 20 is in the released state.

When the operating lever 32 is operated, for example, to the upper side in this state, the discharge pressure of the operating hydraulic pump 31 is reduced by the pressure reducing valve 33 and acts on the pilot port 34a of the control valve 34.
The control valve 34 switches to the A position. Pilot line 3
8a rises, this pressure is selected by the shuttle valve 37 and acts on the pilot port 36a of the switching valve 36,
The switching valve 36 switches to the position b. As a result, the rod chamber of the clutch cylinder 27 communicates with the tank.
By 7b, the piston rod 27A is extended and the clutch is turned on, that is, the second brake device 20 is brought into the braking state.

When the control valve 34 is switched to the position A, the oil discharged from the hydraulic pump 35 is guided to the hydraulic motor 2 via the control valve 34 and the counterbalance valve 39,
The hydraulic motor 2 rotates in the hoisting direction. The rotation of the hydraulic motor 2 is transmitted to the planetary reduction mechanism 3 via its output shaft 2a, but the rotation of the carrier shaft 4 connected to the planetary gear 3f of the planetary reduction mechanism 3 is prevented by the second brake device 20. Therefore, the rotation of the output shaft 2a causes the sun gear 3b,
The winch drum 1 rotates in the hoisting direction via the planetary gear 3c and the ring gear 3a, and the suspended load is hoisted.

In this state, when the brake pedal PD is depressed to bring the first brake device 10 into the braking state and the operating lever 32 is returned to the neutral position, the oil discharged from the operating hydraulic pump 31 is guided to the control valve 34. The control valve 34 returns to the neutral position, the hydraulic motor 2 stops, and the winding stops. Also, at this time, the pressure in the pilot pipe line 38a decreases, so that the switching valve 36 returns to the position a, and the pressure oil of the operating hydraulic pump 31 is guided to the clutch cylinder 27, and the piston rod 27A contracts. Since the PD remains depressed, the second brake device 20 maintains the braking state via the link mechanism 40.

Next, when the operation of the brake pedal PD is gradually released while the operation lever 32 is maintained at the neutral position, the brake band 11 constituting the first brake device 10 gradually loosens. At the same time, the clutch and brake band 21 of the second brake device 20 via the link mechanism 40 also starts to loosen. That is, the first and second brake devices 10 and 2
0 are both released. This makes the winch drum 1
Since the braking of the carrier shaft 4 is released, the winch drum 1 rotates in the lowering direction due to the weight of the suspended load, and free fall is performed. The speed depends on the release amount of the brake pedal PD.

When the brake pedal PD is depressed again during the free fall, the first brake device 10 enters the braking state, and the second brake device 20 enters the braking state via the link mechanism 40. That is, the brake band 11 is wound around the braking portion 1a of the winch drum 1, and the clutch and brake band 21 is wound around the clutch and brake drum 5, whereby the winch drum 1 stops. At this time, winch drum 1
Is braked by the two brake devices 10 and 20, and the braking force is shared by approximately づ in each brake. Therefore, the frictional heat generated in the drums 1 and 5 is smaller than in the conventional case. The amount of heat radiation during braking can be increased, and lining wear can be minimized.

In the above description, the winch drum 1 and the ring gear 2a are integrated, and the brake drum 5 and the carrier shaft 4 are integrated. On the contrary, the winch drum 1 and the carrier shaft 4 are integrated. And the brake drum 5 and the ring gear 2a may be integrated. Also, the first
The brake device may be a booster type using a hydraulic booster, a spring assist type using mechanical assist by a spring or the like, or may be a dynamic hydraulic type or a static hydraulic type. Therefore, various types of the link mechanism 40 can be used depending on these brake types, and both brakes may be interposed by a fluid type as well as a mechanical type.

[0023]

According to the present invention, both the first brake device and the second brake device having a clutch function are brought into a braking state in accordance with the operation of the brake operating member, and the two drums are braked during a free fall. With this configuration, the braking force is shared between the winch drum and the clutch-and-brake drum, and the amount of sliding frictional heat generated by each drum during braking is reduced. Therefore, lining wear can be suppressed, the frequency of replacement can be reduced, and braking force can be increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a winch control device according to the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a winch drum and a brake drum.

FIG. 3 is a diagram showing a conventional winch control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winch drum 1a Brake part 2 Hydraulic motor 3 Planetary reduction mechanism 4 Carrier shaft 5 Clutch and brake drum 10 First brake device 11 Brake band 12,22 Lining 20 Second brake device 21 Clutch and brake band 27 Brake cylinder 32 Operation Lever 33 Pressure reducing valve 34 Hydraulic pilot control valve 36 Switching valve 40 Link mechanism PD brake pedal

Claims (2)

(57) [Claims] 1. A hydraulic motor, a planetary reduction mechanism connected to an output shaft of the hydraulic motor to reduce the rotation of the output shaft, and a winch drum integrated with one of a ring gear and a carrier shaft of the planetary reduction mechanism A first brake device for braking the winch drum; a clutch and brake drum integrated with one of the ring gear and the carrier shaft separate from the winch drum; and braking the clutch and brake drum. When the first brake device is released and the second brake device is in a braking state, the hydraulic motor performs hoisting and lowering, and the first brake device and the second brake device A winch control device in which free fall is performed when both brake devices are released. A brake operating member for operating the key device, the control device of the winch, characterized in that it includes a first interlocking means for the second brake system in conjunction with operation of the brake operating member and the braking state. 2. A motor operating means for commanding rotation of the hydraulic motor, and a second brake device is brought into a braking state in conjunction with a rotation command operation of the hydraulic motor by the motor operating means, and the motor operation is performed. The second means when the means is neutral;
The winch control device according to claim 1, further comprising second interlocking means for releasing the braking of the brake device.