JP2004301305A - Whirl stop device of swivel joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a whirl stop device of a swivel joint that enables the whirl stop of a rotor without requiring a different part of a stopper etc. <P>SOLUTION: The whirl stop device of the swivel joint 23 is equipped at the center of a revolving body 2 installed in a revolution-free manner on a running body 1 and a locking hole 26b is formed to a main frame 10a composed of a car frame 10 of the revolving body 2, and the revolution of a rotor 23b is stopped by inserting the other end of the whirl stop member 26a that fixes one end to the rotor 23b of the swivel joint in the locking hole 26b. The number of components is reduced because the whirl stop of the swivel joint 23 can be done without requiring the stopper of a different member and an assembling man-hour can be reduced because accurate assembling work to a narrow space around the swivel joint 23 is not required. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a swivel joint detent device for a construction machine including a traveling body and a revolving superstructure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, construction machines such as hydraulic shovels have a revolving body that is rotatably mounted on a self-propelled traveling body, and the revolving body includes an engine for power in addition to a driver's cab and working machines. Have been.
The power engine drives a hydraulic pump, and the hydraulic oil discharged from the hydraulic pump is supplied to a hydraulic cylinder that drives a working machine, a swing motor that swings a swing body, and the like. A part is supplied to a traveling motor composed of a hydraulic motor provided on the traveling body so that the traveling body travels.
[0003]
On the other hand, since the revolving unit turns with respect to the traveling unit, when supplying the pressurized oil from the revolving unit side to the traveling unit side, it is necessary to supply the pressure oil to the traveling unit regardless of the revolving unit.
For this reason, in a conventional hydraulic shovel, a swivel joint is installed at the center of rotation of the revolving body, and pressure oil is supplied from the revolving body side to the traveling body side via the swivel joint (for example, Patent Document 1).
[0004]
[Patent Document 1]
JP-A-11-200411 (paragraph 0017, FIG. 1).
[0005]
The swivel joint described in Patent Document 1 has a shaft-shaped rotor rotatably fitted in a cylindrical housing fixed to a frame of a traveling body, and has a port hole formed in the rotor. The fed pressure oil is supplied to the traveling body through a port hole formed on the housing side, and a seal is provided between each port hole on the housing side to be in sliding contact with the outer peripheral surface of the rotor. ing.
A rotation interlocking member projects from an upper end of the rotor, and a tip of the rotation interlocking member is engaged with a stopper fixed to a frame of the revolving unit, whereby the revolving unit and the rotor rotate integrally. It is configured as follows.
[0006]
[Problems to be solved by the invention]
However, as in the swivel joint described in Patent Document 1, a rotation interlocking member protruding from the upper end of the rotor is engaged with a stopper fixed to a frame of the revolving unit so that the rotor rotates together with the revolving unit. In this case, a stopper, which is a separate member, is required, so that the number of parts increases and the cost increases.In addition, a lot of time and labor are required for accurately positioning the stopper in a narrow frame and fixing it to the frame. If it is necessary, the work efficiency is poor and if the mounting position of the stopper is bad, an eccentric load acts on the rotor when the revolving body turns, causing problems such as early wear of the seal and oil leakage. There is.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and has as its object to provide a swivel joint detent device which enables detent of a rotor without requiring a separate component such as a stopper. It is.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a swivel joint detent device according to the present invention is a swivel joint detent device provided at the center of rotation of a revolving unit that is rotatably mounted on a traveling body, wherein A locking hole is formed in the main frame that constitutes the frame, and the rotation of the rotor is locked by inserting the other end of the rotation preventing member having one end fixed to the rotor of the swivel joint into the locking hole. is there.
[0009]
With the above configuration, the swivel joint can be prevented from rotating without the need for a stopper, which is a separate member, so that the number of parts can be reduced, and the work of accurately attaching the stopper to a narrow space around the swivel joint is unnecessary, The number of assembling steps can be reduced, and since it is only necessary to form a locking hole in the main frame, it can be implemented easily and inexpensively.
In addition, since an unbalanced load does not act on the rotor during the rotation of the revolving structure, the seal and the rotor do not wear out early, thereby improving the durability of the swivel joint and preventing oil leakage. .
[0010]
In order to achieve the above object, the present invention provides a swivel joint detent device in which one end of a detent member is fixed in a tangential direction of a rotor, and a locking hole is formed at a position where the detent member and the main frame intersect. It is.
[0011]
According to the above configuration, the locking hole is formed at a position sufficiently distant from a portion where the main frame intersects with the turning wheel attached to the bottom surface of the body frame, and the rigidity of the main frame may be reduced. Therefore, there is no need to take measures such as reinforcing the main frame, so that there is no fear of an increase in cost.
[0012]
In order to achieve the above object, a swivel joint detent device of the present invention is provided such that a revolving body having a body frame is revolvably provided on a self-propelled traveling body, and provided on a revolving body side at a revolving center of the revolving body. A detent device for a swivel joint in a construction machine such as a hydraulic shovel provided with a swivel joint for supplying hydraulic pressure to a traveling motor provided on a traveling body from a hydraulic pump provided, and a housing of the swivel joint is fixed to a vehicle body side. In addition, one end of the detent member is fixed to the upper portion of the rotor rotatably provided in the housing so as to be tangential to the rotor, and the detent member and the main frame constituting the vehicle body frame intersect. The rotation of the rotor was locked by forming a locking hole at the position where Than it is.
[0013]
With the above configuration, since the swivel joint can be prevented from rotating without the need for a bracket as a separate member, the number of parts can be reduced, and the work of accurately attaching the bracket to a narrow space around the swivel joint is unnecessary, The number of assembling steps can be reduced, and it is only necessary to form a locking hole in the main frame. Therefore, the present invention can be implemented easily and inexpensively, and there is no uneven load applied to the rotor during the turning of the rotating body. Therefore, the seal and the rotor do not wear out early, thereby improving the durability of the swivel joint.
In addition, since one end of the detent member is fixed in the tangential direction of the rotor and a locking hole is formed at a position where the detent member and the main frame intersect, the turning wheel and the main frame attached to the bottom surface of the vehicle body frame are separated. The locking hole is formed at a position sufficiently distant from the portion where the load intersects the most, so that the rigidity of the main frame does not decrease, and there is no need to take measures such as reinforcing the main frame. Don't worry about getting up.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment in which the present invention is applied to a hydraulic shovel will be described in detail with reference to the drawings.
1 is a partially cutaway side view of a hydraulic shovel, FIG. 2 is a plan view showing a body frame of a revolving superstructure, FIG. 3 is a perspective view showing an upper part of a swivel joint, and FIG. 4 is a sectional view of the same.
The hydraulic excavator shown in FIG. 1 includes a self-propelled traveling body 1 and a revolving body 2 which is installed on the traveling body 1 so as to be freely rotatable.
The traveling body 1 has a track frame 3 composed of a center frame 3a and a pair of side frames 3b provided on both sides of the center frame 3a so as to be parallel to each other. The other end is provided with a sprocket 6 rotatably driven by a traveling motor 5 composed of a hydraulic motor.
[0015]
An endless crawler belt 7 is wound between the idler 4 and the sprocket 6, and by driving the crawler belt 7 with the sprocket 6, the traveling body 1 can run on its own and the side frame 3b A plurality of rolling wheels 8 are rotatably supported on the upper and lower portions.
The revolving unit 2, which is rotatably mounted on the center frame 3 a of the truck frame 3, has a bottom portion formed by a body frame 10, and a work implement 11 is mounted on the body frame 10.
[0016]
As shown in FIG. 1, the working machine 11 has a boom 12 whose base end is pivotally attached to a vehicle body frame 10 and which can be raised and lowered by a boom cylinder 13, a base end side which is pivotally attached to a tip end of the boom 12, and an arm cylinder 14. And a bucket 17 pivotally attached to the tip of the arm 15 and rotatable by a bucket cylinder 16.
A driver's cab 18 is installed at a front portion of the body frame 10 at a side of the working machine 11, and an engine room 19 covered by a hood cover 19 a is installed at a rear portion of the body frame 10. A power engine 20 is accommodated in the engine room 19, and a counterweight 21 is attached to a rear end of the body frame 10.
[0017]
A hydraulic pump 22 is connected to the engine 20 housed in the engine room 19, and the hydraulic pump 22 is driven by the engine 20. The hydraulic oil discharged from the hydraulic pump 22 After being controlled by a control valve 24 installed behind the chamber 18, a boom cylinder 13, an arm cylinder 14, a bucket cylinder 16 provided in the work machine 11, and a swing motor (not shown) for swinging the swing body 2 are provided. The work implement 11 and the revolving superstructure 2 are supplied and driven.
A part of the oil is supplied to the traveling motor 5 provided on the traveling body 1 through a swivel joint 23 provided at the center of rotation of the revolving body 2, and the return oil from the traveling motor 5 is returned to the swivel joint 23 and the control valve 24 again. And is circulated to the hydraulic oil tank 25 installed on the revolving superstructure 2 side.
[0018]
On the other hand, the body frame 10 of the revolving superstructure 2 is installed so that a pair of main frames 10a spaced apart in the vehicle width direction and parallel to each other face each other with the swivel joint 23 interposed therebetween as shown in FIG. The lower part of the boom 12 is rotatably supported on the front part of the frame 10a, the engine 20 is mounted on the rear part of the main frame 10a in the horizontal direction, and the swivel wheel 30 is provided on the bottom surface at the position indicated by the broken line in FIG. Installed.
[0019]
As shown in FIGS. 3 and 4, the swivel joint 23 has a cylindrical housing 23a having an upper end fixed to the center frame 3a of the traveling body 1 and is rotatably slidably inserted into the housing 23a. And a shaft-shaped rotor 23b.
On the inner peripheral surface of the housing 23a, a plurality of annular ports 23c are formed at intervals vertically so as to surround the periphery of the rotor 23b, and between these ports 23c, the outer peripheral surface of the rotor 23b is formed. A ring-shaped seal member 23f that slides and seals so as not to cause oil leakage between the ports 23c is interposed.
[0020]
A plurality of passages 23d are formed in the rotor 23b in the axial direction. The upper ends of the passages 23d are opened at the upper end surface of the rotor 23b, and the lower ends are communicated with the ports 23c on the housing 23a side. ing.
Each port 23c on the side of the housing 23a is connected to a traveling motor 5 provided on the traveling body 1 side by a conduit 28 and to a switching means (not shown) for switching a speed stage of the traveling motor 5; The passage 23 d opened at the upper end face is connected to a control valve 24 provided on the revolving unit 2 side by a pipe line 29.
The rotor 23b of the swivel joint 23 is locked to the revolving unit 2 by a rotation preventing device 26 so as to rotate integrally with the revolving unit 2.
The detent device 26 is provided with a detent member 26a in the tangential direction of the rotor 23b as shown in FIGS.
The detent member 26a is formed in a rectangular shape by a steel plate, and has one end fixed to a mounting portion 23g protruding from the upper end of the rotor 23b by a fixing tool 31.
[0021]
The other end of the rotation preventing member 26a is fitted into a locking hole 26b formed in one of the main frames 10a constituting the vehicle body frame 10 from the inside of the main frame 10a.
The locking hole 26b is formed in a position where the rotation preventing member 26a provided in the tangential direction of the rotor 23b and the main frame 10a are perpendicular to each other, and is slightly larger than the cross-sectional shape of the rotation preventing member 26a and narrow in the front-rear direction. The swivel joint 23 is formed in a long shape, and a slight gap is formed between the swivel joint 23 and the detent member 26a.
[0022]
The orthogonal position of the detent member 26a provided in the direction in which the rotor 23b is connected to the main frame 10a is perpendicular to the position where the main frame 10a intersects with the revolving wheel 30 that supports the revolving unit 2 so as to be revolvable as shown in FIG. Is located farthest from such a portion, and even if the locking hole 26b is formed in the main frame 10a, the strength of the main frame 10a is little affected, so that the plate thickness of the main frame 10a is increased. It is not necessary to increase rigidity or to reinforce with a reinforcing material.
In FIG. 4, reference numeral 32 denotes a thrust receiver for restricting the movement of the rotor 23b in the thrust direction. A projection 32a protruding from the thrust receiver 31 is fitted into an annular groove 32b formed at the lower end of the rotor 23b. By supporting the thrust force acting on the rotor 23b, the movement of the rotor 23b in the thrust direction is restricted.
[0023]
Next, the operation of the thus configured swivel joint detent device will be described.
The hydraulic excavator runs by pressure oil discharged from a hydraulic pump 22 installed on the revolving unit 2 side, and the work implement 11 and the revolving unit 2 are driven, and the excavator is discharged from the hydraulic pump 22. The pressure oil is supplied to the cylinders 13, 14, 16 of the working machine 11 and the swing motor via the control valve 24, and is provided to the traveling body 1 via a swivel joint 23 provided at the center of the swing of the swing body 2. Is supplied to the traveling motor 5.
Further, when the revolving unit 2 is turned during the operation, the rotor 23b locked by the detent means 26 to the body frame 10 of the revolving unit 2 is fixed to the housing 23a fixed to the center frame 3a of the traveling unit 1. Even though the rotor 23b rotates relatively, the passage 23d on the rotor 23b side and the port 23c on the housing 23a side are always in communication even when the rotor 23b rotates, and the pressure is continuously applied to the traveling motor 5 on the traveling body 1 side while the revolving body 2 is turning. Since the oil can be supplied, it is possible to work with the work machine 10 while traveling by the traveling body 1 and to turn the revolving body 2.
[0024]
Further, when the revolving unit 2 rotates, the rotation preventing member 26 that allows the rotor 23b to rotate integrally with the revolving unit 2 has one end inserted into a locking hole 26b formed in the main frame 10a of the vehicle body frame 10. Since it is composed of only the detent member 26a and does not require a separate member such as a conventional stopper, the number of parts is reduced, and the work of accurately attaching the stopper to a narrow space is not required.
[0025]
In the above embodiment, the case where the present invention is applied to a hydraulic excavator has been described. However, the present invention can be applied to construction machines such as a truck crane and a crawler carrier having a revolving body. In addition, the example in which the locking hole 26b is formed at a position where the detent member 26 and the main frame 10a are orthogonal to each other has been described, but the revolving unit 30 and the main frame 10a are separated in a range apart from a portion where the load intersects most. If so, the same effect can be obtained even if the locking holes are formed at positions obliquely intersecting.
[0026]
【The invention's effect】
As described above in detail, the present invention provides a detent member having a locking hole formed in a main frame constituting a body frame of a revolving body and having one end fixed to a swivel joint rotor provided at the revolving center of the revolving body. By inserting the other end into the locking hole, the rotation of the rotor is locked, so that the swivel joint can be prevented from rotating without the need for a separate stopper, thereby reducing the number of parts, Since there is no need to accurately mount the stopper in a narrow space around the swivel joint, the number of assembly steps can be reduced.
[0027]
In addition, since it is only necessary to form a locking hole in the main frame, it is easy and inexpensive to carry out. In addition, since an unbalanced load does not act on the rotor during the turning of the rotating body, the seal or the rotor can be quickly mounted. The swivel joint does not wear out, thereby improving the durability of the swivel joint and preventing oil leakage.
Furthermore, since one end of the detent member is fixed in the tangential direction of the rotor, and a locking hole is formed at a position where the detent member and the main frame intersect, the turning wheel and the main frame attached to the bottom surface of the vehicle body frame are separated. The locking hole is formed at a position sufficiently distant from the portion where the load intersects the most, so that the rigidity of the main frame does not decrease, and it is not necessary to take measures such as reinforcing the main frame. Don't worry about getting up.
[Brief description of the drawings]
FIG. 1 is a side view of a construction machine employing a swivel joint detent device according to an embodiment of the present invention.
FIG. 2 is a plan view showing a vehicle body frame of a construction machine employing a swivel joint detent device according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a swivel joint detent device according to an embodiment of the present invention.
FIG. 4 is a sectional view showing a swivel joint detent device according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 5 Traveling motor 10 Body frame 10a Main frame 22 Hydraulic pump 23 Swivel joint 23a Housing 23b Rotor 26 Detent means 26a Detent member 26b Lock hole

Claims (3)

A swivel joint detent device provided at the center of rotation of a revolving unit that is rotatably mounted on a traveling unit, wherein a locking hole is formed in a main frame constituting a body frame of the revolving unit, and A rotation preventing device for a swivel joint, wherein the rotation of the rotor is locked by inserting the other end of a rotation preventing member having one end fixed to the rotor of the swivel joint into the locking hole. 2. The swivel joint according to claim 1, wherein one end of the detent member is fixed in a tangential direction of the rotor, and the locking hole is formed at a position where the detent member intersects with the main frame. 3. apparatus. A revolving body having a vehicle body frame is provided on a self-propelled traveling body so as to be revolvable, and a hydraulic pump provided on the revolving body side is provided at a revolving center of the revolving body to a traveling motor provided on the traveling body side. A detent device for a swivel joint in a construction machine such as a hydraulic shovel provided with a swivel joint for supplying hydraulic pressure, wherein a housing of the swivel joint is fixed to the traveling body side and rotatably provided in the housing. At the top of the rotor, one end of a detent member is fixed so as to be tangential to the rotor, and a locking hole is formed at a position where the detent member and a main frame constituting the body frame intersect. The rotation of the rotor is locked by inserting the other end of the rotation preventing member into the locking hole. Detent device of the swivel joint in 械.

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