JPH0748859A - Swing braking system for construction and cargo handling machines - Google Patents

Abstract

PURPOSE:To surely fix an upper revolving superstructure to a frame such as a lower travel body at an optional revolution position with no backlash. CONSTITUTION:The revolution braking device of a construction/cargo handling work machine has an upper revolving superstructure 2 on a frame 1. It is provided with a brake face section 17 extended in the revolution direction and concentrically with the revolution center of the upper revolving superstructure 2 on one of the frame 1 and the upper revolving superstructure 2 and a braking member 22 selectively friction-coupled with the brake face section 17 on the other. The upper revolving superstructure 2 is directly fixed to the frame 1 with no inclusion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing braking device for a construction / cargo handling machine, such as a crane, a hydraulic excavator, and an aerial work vehicle, which has an upper swing body on a base.

[0002]

2. Description of the Related Art Construction and cargo handling machines such as cranes, hydraulic excavators, and aerial work vehicles have an upper revolving structure which is rotatable about a vertical axis on a base such as a lower traveling structure. In this type of construction / loading work machine, swing braking for fixing the upper swing body to an arbitrary swing position is generally performed by providing a disc brake on the output shaft of a hydraulic motor for driving the upper swing body. This is done by fixing the motor output shaft with a brake.

[0003]

In the swing drive of the upper swing body by the hydraulic motor, the rotation of the motor output shaft is decelerated and transmitted to the pinion by the gear type speed reducer, and the pinion is fixed to the base body (lower traveling body). Since it is performed by rolling by meshing with the ring gear, the motor output shaft is driven by the disc brake due to backlash of the gear meshing portion and torsional elastic deformation of the shaft in the power transmission path from the motor output shaft to the pinion. Even if it is fixed, the upper revolving structure is fixed to the lower traveling structure with rattling in the revolving direction. Therefore, when a turning external force acts on the upper revolving superstructure, the upper revolving superstructure makes a swing movement with respect to the lower traveling structure by the amount of rattling.

[0004] For example, in the case of a crane, the swing of a suspended load and the wind force acting on the boom act on the upper revolving structure as an external force of revolving, which causes the upper revolving structure to rattle and rotate. When the upper swing body rattles and swings, the boom provided on the upper swing body also swings and the swing displacement amount at the boom tip becomes larger as the boom length becomes longer, and the swing displacement amount at the boom tip becomes 1 m. It may also exceed. Such rattling and swiveling of the upper swing body causes deterioration of other operability such as winding.

As a measure against this problem, the backlash of the gears in the power transmission system for turning drive is reduced to reduce the rattling and turning amount of the upper turning body, as disclosed in Japanese Utility Model Laid-Open No. 57-110165. 61-88
No. 994, Actual Kai 1-11-156, Actual Kai 3-11
No. 5159 is proposed. However, all of them have a complicated structure and can reduce the backlash, but cannot completely eliminate the backlash. Therefore, the rattling and swinging of the upper swing body is completely eliminated. It is not possible. In addition, rattling and turning due to torsional deformation of the shaft and the like in the power transmission system cannot be eliminated.

The present invention provides a swing braking device for a construction / cargo handling machine capable of securely fixing an upper swing body to a base body such as a lower traveling body at any swing position without rattling. The purpose is to do.

[0007]

1 to 8 showing an embodiment, the swing braking device for a construction / cargo handling machine according to the present invention has an upper swing body 2 on a base body 1. In the swing braking device of the construction / cargo handling machine that we have,
A braking surface portion 17 extending in the turning direction concentric with the turning center of the upper turning body 2 on either the base 1 or the upper turning body 2.
And a braking member 22 that selectively frictionally engages with the braking surface portion 17 is provided on the other side. Further, the braking surface portion 22 may be provided from the outer peripheral surface of the outer race 8 of the turning wheel that guides the turning of the upper turning body 2 with respect to the base body 1.

[0008]

The braking surface portion 22 provided on either the base body 1 or the upper revolving structure 2 has a braking member 2 provided on the other.
Due to the frictional engagement of the two, the upper swing body 2 is directly fixed to the base body 1 at any swing position without interposing an intervening substance that causes rattling.

Incidentally, in the section of means and action for solving the above problems for explaining the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0010]

FIG. 2 shows an example of a crane to which a swing braking device according to the present invention is applied. This crane has an upper revolving structure 2 on a lower traveling structure 1 as a base body so as to be revolvable around a vertical axis. A boom 3 is provided on the upper swing body 2. 1, 3 and 4 show an embodiment of a swing braking device provided in a crane. The frame 4 of the lower traveling structure 1 is integrally provided with an annular race attachment base 5 which is concentric with the center of rotation of the upper rotating body 2.
An annular turning wheel inner race 7 is fixedly mounted on the race mounting base 5 with a mounting bolt 6 concentrically with the turning center of the upper turning body 2.

An outer race 8 of a slewing wheel is fixedly mounted on the lower bottom surface of the upper slewing body 2 concentrically with the center of rotation of the upper slewing body 2 with a mounting bolt 9 and a nut 10. The slewing wheel outer race 8 is arranged outside the slewing wheel inner race 7,
A plurality of rolling elements 11 are provided between the outer race 8 and the inner race 7. As a result, the upper revolving structure 2 is guided by the rolling bearing structure including the inner race 7, the outer race 8 and the rolling elements 11 and revolves around the vertical axis with respect to the lower traveling structure 1.

A gear type speed reducer 12 is fixedly mounted on the upper revolving structure 2. An input shaft (not shown) of the speed reducer 12 is drivingly connected to an output shaft (not shown) of the motor 13, and is driven by the motor 13. It is driven to rotate. A pinion 15 is attached to the output shaft 14 of the speed reducer 12, and the pinion 15 meshes with an internal gear type ring gear 16 formed on the inner peripheral surface of the inner race 7. The pinion 15 is rotationally driven by the motor 13 via the speed reducer 12, and revolves around the ring gear 16 while rotating on its own by meshing with the ring gear 16, and this revolution causes the upper revolving structure 2 to rotate the upper revolving structure 1 and the lower traveling structure 1.
Drive to turn against.

The outer peripheral surface of the outer race 8 is machined along its entire circumference, and the outer peripheral surface of the outer race 8 serves as a braking surface portion 17 concentric with the center of rotation of the upper revolving structure 2 and extending in the turning direction. A hydraulic cylinder device 19 of a pad type braking device is mounted on the frame 4 of the undercarriage 1 by a mounting member 18. Hydraulic cylinder device 19
A brake lining mounting plate 21 is fixedly attached to the tip end portion of the piston rod 20. The brake lining mounting plate 21 faces the braking surface portion 17, and the brake lining 22 is mounted on the facing surface portion.

The hydraulic cylinder device 19 includes a cylinder chamber 23.
When the hydraulic pressure is supplied to the piston rod 20, the piston rod 20 is driven to the left in FIG. 3 against the spring force of the compression coil spring 24, and the brake lining 22 is pressed against the braking surface portion 17. It should be noted that the hydraulic cylinder devices 19 are respectively provided at two positions which are displaced by 180 degrees from each other around the outer race 8 as shown in FIG. The hydraulic pressure supply / discharge to / from the cylinder chamber 23 of the hydraulic cylinder device 19 is shown in FIG.
As shown in FIG. 4, the driver operates the brake operating lever 26 provided in the driver's cab 25 provided in the upper swing body 2 by remote control.

According to the above-described structure, the driver operates the brake operating lever 26 to supply the hydraulic pressure to the cylinder chamber 23 of the hydraulic cylinder device 19.
The piston rod 20 moves to the left in FIG. As a result, the brake lining 22 is pressed against the braking surface portion 17 formed by the outer peripheral surface portion of the outer race 8, and the brake lining 22 frictionally engages with the braking surface portion 17, so that the upper revolving structure 2 is at an arbitrary revolving position with respect to the lower traveling structure 1. It is fixed directly without rattling. The braking force in this case is
It is not necessary to oppose the turning drive force of the upper swing body 2 by the motor 13, and may be a braking force that prevents the upper swing body 2 from turning due to the wind force received by the suspended load.

The release of the braking state is performed by the hydraulic cylinder device 1.
This is done by opening the drain of the cylinder chamber 23 of No. 9. When the cylinder chamber 23 is drained, the piston rod 20 moves to the right in FIG. 3 due to the spring force of the compression coil spring 24, and the brake lining 22 causes the braking surface portion 17 to move.
The upper revolving structure 2 is separated from the lower traveling structure 1 by being further separated.
It becomes possible to freely turn with respect to.

5 to 8 show another embodiment of the swing braking device according to the present invention. 5 to 8, parts corresponding to those in FIGS. 1 to 4 are indicated by the same reference numerals as those in FIGS. 1 to 4. In the embodiment shown in FIG. 5, a band type braking device is used, and the brake band 27 is the outer peripheral surface of the outer race 8.
That is, it is arranged so as to surround the braking surface portion 17, the dead end is locked to the frame 4 of the undercarriage 1 by the pin 28, and the live end is held by the lever 29 to the frame 4.
It is drivingly connected to a brake cylinder 30 fixed to the.

In this embodiment, the brake band 27 is tightened by the brake cylinder 30, the brake band 27 is pressed against the braking surface portion 17 and frictionally engages with the braking surface portion 17, so that the upper revolving superstructure 2 turns freely. At the position, it is directly fixed to the undercarriage 1 without rattling.

FIG. 6 shows an example of using the disc brake.
In this embodiment, an annular brake disc 31 is fixedly attached to the outer peripheral portion of the outer race 8. A disc brake unit 33 is fixedly attached to the frame 4 of the lower traveling body 1 by a mounting member 32. The disc brake unit 33 sandwiches the brake disc 31 from both sides by a brake lining (not shown),
Frictionally engage it. As a result, the upper revolving structure 2 is directly fixed to the lower traveling structure 1 without any rattling at an arbitrary revolving position.

In this embodiment, when it is not necessary to perform the turning braking over the entire turning position of the upper turning body 2, the brake disc 31 is partially provided only in the turning angle range where the turning braking is required. Should be provided.

In the embodiment shown in FIG. 7, a race attachment base 5 fixed to the frame 4 of the undercarriage 1.
The inner peripheral surface of the hydraulic cylinder device 1 serves as the braking surface 17.
9 is fixedly attached to the lower bottom surface of the upper revolving unit 2 by a mounting member 34. When the brake lining 22 is pressed against the braking surface portion 17 by the hydraulic cylinder device 19,
The brake lining 22 frictionally engages the braking surface portion 17,
The upper revolving structure 2 is directly fixed to the lower traveling structure 1 at an arbitrary revolving position without rattling. In this case, the oil supply / drain passage of the hydraulic cylinder device 19 is provided on the upper swing body 2 side, and in relation to the brake operation lever 26 provided in the operator's cab 26 of the upper swing body 2, It is easy to handle the hydraulic piping.

In the embodiment shown in FIG. 8, the brake disc 31 is fastened together by the mounting bolt 6 between the race mounting base 5 and the inner race 7 on the lower traveling body 1 side. A disc brake unit 33 is fixedly attached to the upper revolving structure 2 by a mounting member 34. In this case as well, the disc brake unit 33 sandwiches the brake disc 31 from both sides by a brake lining (not shown), and by frictional engagement thereof. The upper revolving structure 2 is directly fixed to the lower traveling structure 1 without any rattling at any revolving position.

Also in this embodiment, when it is not necessary to perform the turning braking over the entire turning position of the upper turning body 2, the brake disc 31 is partially provided only in the turning angle range where the turning braking is required. Should be provided.

Further, as another embodiment, the braking surface portion 1
In addition to the outer peripheral surface of the outer race 8 and the inner peripheral surface of the race mounting base 5, 7 may be provided by another braking surface constituent member that extends concentrically with the center of rotation of the upper revolving structure 2 in the turning direction.
Furthermore, the present invention is not limited to a self-propelled work vehicle, and the present invention can be applied to a fixed crane or the like.

[0025]

According to the swing braking apparatus for a construction / cargo handling machine according to the present invention, the braking surface portion provided on either the base body such as the lower traveling body or the upper swing body is provided on the other. By the frictional engagement of the braking member, the upper-part turning body is directly fixed to the base body at any turning position without interposing an interposition that causes rattling, so that the gears in the power transmission system for turning drive are The upper swing body is fixed to the base body without rattling regardless of the presence of backlash. As a result, for example, in a crane, even if the swing of the suspended load or the wind force acting on the boom acts on the upper revolving structure as a revolving external force, the upper revolving structure does not rattle and swing against the base body. The boom of the body does not turn carelessly, and operability such as hoisting is improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a swing braking device for a construction / cargo handling machine according to the present invention.

FIG. 2 is an overall view showing an example of a crane to which a swing braking device according to the present invention is applied.

FIG. 3 is a sectional view showing an embodiment of a swing braking device for a construction / cargo handling machine according to the present invention.

FIG. 4 is a schematic configuration diagram showing an operator cab of a construction / cargo handling machine equipped with a swing braking device according to the present invention.

FIG. 5 is a plan view showing another embodiment of a swing braking device for a construction / cargo handling machine according to the present invention.

FIG. 6 is a cross-sectional view showing another embodiment of the swing braking device for a construction / cargo handling machine according to the present invention.

FIG. 7 is a cross-sectional view showing another embodiment of a swing braking device for a construction / cargo handling machine according to the present invention.

FIG. 8 is a cross-sectional view showing another embodiment of the swing braking device for a construction / cargo handling machine according to the present invention.

[Explanation of symbols]

 1 Base 2 Upper Revolving Body 7 Swivel Inner Race 8 Slewing Wheel Outer Race 11 Rolling Body 12 Speed Reducer 13 Motor 15 Pinion 16 Ring Gear 17 Braking Surface 19 Hydraulic Cylinder Device 22 Brake Lining 26 Brake Operating Lever 27 Brake Band 30 Brake Cylinder 31 Brake Disc 33 Disc brake unit

Claims (2)

[Claims] 1. A swing braking device for a construction / cargo handling machine having an upper swing body on a base body, wherein one of the base body and the upper swing body extends in the swing direction concentric with the swing center of the upper swing body. And a braking member that selectively frictionally engages with the braking surface portion is provided on the other side, and a swing braking device for a construction / cargo handling machine is provided. 2. The turning braking of a construction / cargo handling machine according to claim 1, wherein the braking surface portion is an outer peripheral surface of an outer race of a turning wheel that guides turning of the upper turning body with respect to the base body. apparatus.