KR101052842B1 - Anti-rotation device of swivel joint - Google Patents

Abstract

The present invention provides an anti-rotation device of a swivel joint which enables the anti-rotation of a rotor without requiring other parts such as a stopper.

Main frame 10a constituting the vehicle body frame 10 of the swinging body 2 as a rotation preventing device of the swivel joint 23 provided at the swinging center of the swinging body 2 freely swinging on the traveling body 1. The other end of the anti-rotation member 26a having one end fixed to the rotor 23b of the swivel joint 23 and inserted into the stop hole 26b. By stopping the rotation of 23b), it is possible to prevent rotation of the swivel joint 23 without the need for a stopper which is another member, so that the number of parts can be reduced, and the stopper is placed in a narrow space around the swivel joint 23. Since the work of precisely installing the structure is unnecessary, the number of assembly steps can be reduced.

Description

Anti-rotation device of swivel joint {ANTI-ROTATION APPARATUS OF SWIVEL JOINT}

1 is a side view of a construction machine employing an anti-rotation device of a swivel joint according to an embodiment of the present invention;

2 is a plan view showing a body frame of a construction machine employing a rotation preventing device of a swivel joint according to an embodiment of the present invention;

3 is a perspective view showing an anti-rotation device of a swivel joint according to an embodiment of the present invention;

4 is a cross-sectional view showing a rotation preventing device of a swivel joint according to an embodiment of the present invention.

※ Explanation of symbols for main parts of drawing

1: traveling body 2: turning body

5: driving motor 10: body frame

l0a: main frame 22: hydraulic pump

23: swivel joint 23a: housing

23b: rotor 26: rotation preventing means

26a: rotation preventing member 26b: locking hole

The present invention relates to an anti-rotation device of a swivel joint in a construction machine comprising a traveling body and a swinging body.

Conventionally, for example, a construction machine such as a hydraulic excavator is provided with a swinging structure freely swinging on a freely running body, and a power engine is mounted on the swinging body in addition to a cab, a working machine, and the like.

The power engine is configured to drive a hydraulic pump, and the hydraulic oil discharged from the hydraulic pump is supplied to a hydraulic cylinder for driving a work machine, a swing motor for turning a swinging body, and some of the hydraulic motors installed in the traveling body. The traveling body is supplied to the traveling motor to be made.

On the other hand, since the swinging body rotates with respect to the traveling body, when hydraulic oil is supplied from the swinging body side to the traveling body side, it is necessary to be able to supply the hydraulic oil to the traveling body regardless of the turning of the swinging body.

For this reason, the conventional hydraulic excavator is provided with a swivel joint at the pivot center of the swinging structure, and pressurized oil is supplied from the swinging body side to the traveling body side via the swivel joint (for example, Patent Document 1).

[Patent Document 1]

Japanese Patent Laid-Open No. 11-200411 (paragraph 0017, Fig. 1).

In the swivel joint described in Patent Document 1, an axial rotor is rotatably inserted in a cylindrical housing fixed to a frame of a traveling body, and pressure oil sent from a port hole formed in the rotor passes through a port hole formed on the housing side. It is supplied to the traveling body side, and between each port hole of the housing side, the seal which slides in contact with the outer peripheral surface of a rotor is provided.

In addition, a rotary motion member protrudes from the upper end of the rotor, and the tip of the rotary motion member is engaged with a stopper fixed to the frame of the swing structure, whereby the swing structure and the rotor are configured to rotate integrally.

However, as in the swivel joint described in the patent document 1, when the rotary motion member protruding from the upper end of the rotor is engaged with the stopper fixed to the frame of the swinging body so that the rotor rotates together with the swinging body, the stopper is another member. As a result, the number of parts is increased, the cost is increased, and the work efficiency is poor because the work of fixing the stopper precisely in a narrow frame and fixing it to the frame requires a lot of time and labor. If the installation position is bad, there is a problem that the eccentric load acts on the rotor when the swinging body turns, causing the seal to wear prematurely or cause oil leakage.

The present invention has been made to improve such a conventional problem, and an object of the present invention is to provide an anti-rotation device of a swivel joint, which enables rotation of the rotor without requiring other parts such as a stopper.

In order to achieve the above object, the swivel joint anti-rotation device of the present invention is an anti-rotation device of the swivel joint provided at the pivot center of the swivel body freely swinging on the traveling body, The rotation of the rotor is stopped by forming a stop hole, and inserting the other end of the anti-rotation member having one end fixed to the rotor of the swivel joint into the stop hole.

With the above configuration, the rotation of the swivel joint can be prevented without the need for a stopper, which is another member, so that the number of parts can be reduced, and the work of accurately installing the stopper in a narrow space around the swivel joint is unnecessary. As a result, the number of assembly steps can be reduced, and at the same time, it is possible to easily and inexpensively carry out only by installing a stopper hole in the main frame.

In addition, since the unloading load does not act on the rotor during the turning of the swinging body, the seal and the rotor are not worn out prematurely, thereby improving the durability of the swivel joint and not causing oil leakage.

In order to achieve the above object, the anti-rotation device of the swivel joint of the present invention secures one end of the anti-rotation member in the tangential direction of the rotor, and forms a stopping hole at a position where the anti-rotation member and the main frame intersect. It is.

Because of the above configuration, the locking hole is formed at a position far enough from the most loaded portion where the pivot wheel provided on the bottom surface of the vehicle body frame intersects with the main frame, so that the rigidity of the main frame is not lowered. No countermeasures such as reinforcing the main frame are necessary, so there is no fear of cost increase.                     

In order to achieve the above object, the anti-rotation device of the swivel joint of the present invention is freely provided with a swinging structure having a vehicle body frame on a freely moving body, and is further provided with a traveling body side from a hydraulic pump installed at the swinging body side at the pivoting center of the swinging body. An anti-rotation device of a swivel joint in a construction machine such as a hydraulic excavator provided with a swivel joint for supplying hydraulic pressure to a traveling motor installed in the motor. The rotor of the rotor fixed to the vehicle body and rotatably installed in the housing. At the same time, one end of the anti-rotation member is fixed to the rotor so as to be tangential to the rotor, and at the same time, a stop hole is formed at a position where the anti-rotation member and the main frame constituting the vehicle body frame intersect. The rotor is stopped by inserting the other end of the anti-rotation member. .

By the above configuration, the rotation of the swivel joint can be prevented without the need for the bracket, which is another member, and thus the number of parts can be reduced, and the work for installing the bracket precisely in a narrow space around the swivel joint becomes unnecessary. Therefore, the number of assembly steps can be reduced, and only a stopper is provided in the main frame, so that the load can be easily and inexpensively performed, and the load acts on the rotor during the turning of the swinging body. As a result, the seal and the rotor are not worn out prematurely, thereby improving the durability of the swivel joint.

In addition, since one end of the anti-rotation member is fixed in the tangential direction of the rotor and a stop hole is formed at the position where the anti-rotation member and the main frame intersect, the turning wheel and the main frame provided on the bottom surface of the body frame Since the locking hole is formed at a position far enough from the most loaded portion to intersect, the rigidity of the main frame does not decrease, thereby increasing the cost since no measures such as reinforcing the main frame are necessary. There is no worry.

EMBODIMENT OF THE INVENTION Embodiment which implemented this invention on the hydraulic excavator is demonstrated in detail with reference to drawings.

1 is a side view of a part of a hydraulic excavator, FIG. 2 is a plan view showing a vehicle body frame of a revolving structure, FIG. 3 is a perspective view showing an upper portion of a swivel joint, and FIG. 4 is a cross-sectional view thereof.

The hydraulic excavator shown in FIG. 1 consists of the freely moving body 1 and the freely rotating body 2 provided on the traveling body 1 by turns.

The traveling body 1 has the center frame 3a and the track frame 3 which consists of a pair of side frame 3b provided in parallel with each other, and the idler is provided at one end of each side frame 3b. (4) is supported freely to move forward and backward, and the sprocket 6 which is rotationally driven by the traveling motor 5 which consists of a hydraulic motor is provided in the other end side.

An endless caterpillar 7 is wound between the idler 4 and the sprocket 6, and the traveling body 1 can be frequently driven by driving the caterpillar 7 with the sprocket 6. At the same time, a plurality of front wheels 8 are rotatably supported on the upper and lower portions of the side frame 3b.

In the swinging structure 2 provided on the center frame 3a of the track frame 3 freely swinging, the bottom portion is constituted by the body frame 10, and the work machine 11 is attached to the body frame 10. .

As shown in FIG. 1, the work machine 11 pivots the base end to the vehicle body frame 10, and the base end side pivots on the free-form boom 12 and the tip of the pour 12 by the pour cylinder 13. The arm 15 is pivotally pivoted by the arm cylinder 14 and the tip of the arm 15, and the bucket cylinder 16 is pivotally pivotable.

In the front part of the body frame 10, the cab 18 is installed on the side of the work machine 11, and in the rear part of the body frame 10, the engine compartment 19 covered by the bonnet cover 19a is provided. The engine 20 for power is accommodated in this engine room 19, and the counter weight 21 is provided in the rear end of the vehicle body frame 10. As shown in FIG.

The hydraulic pump 22 is connected to the engine 20 accommodated in the engine compartment 19, and the hydraulic pump 22 is driven by the engine 20, and the hydraulic oil discharged from the hydraulic pump 22 is cab. After being controlled by the control valve 24 provided at the rear of the 18, the swivel cylinder 13, the arm cylinder 14, the packet cylinder 16, and the swinging body 2 provided in the work machine 11 are pivoted. It is supplied to the revolving motor (not shown), and the work machine 11 and the revolving body 2 are driven.

In addition, a part is supplied to the traveling motor 5 installed in the traveling body 1 via the swivel joint 23 provided at the pivot center of the swinging structure 2, and the return oil from the traveling motor 5 is again swivel joint 23. And a control valve 24 to be circulated to the working oil tank 25 provided on the swinging structure 2 side.

On the other hand, as shown in FIG. 2, the body frame 10 of the revolving structure 2 faces a pair of main frames 10a which are spaced apart in the vehicle width direction and parallel to each other with the swivel joint 23 interposed therebetween. The lower part of the pour 12 is rotatably supported by the front part of these main frames 10a, and the engine 20 is mounted in the horizontal direction at the back of the main frame 10a, and the bottom is The turning wheel 30 is provided in the broken line position of FIG.

3 and 4, the swivel joint 23 rotates in a cylindrical housing 23a having an upper end fixed to the center frame 3a side of the traveling body 1, and in the housing 23a. It consists of an axial rotor 23b inserted slidingly inserted.

On the inner circumferential surface of the housing 23a, annular ports 23c are formed in plural stages with an interval therebetween so as to surround the rotor 23b, and the rotor 23b between these ports 23c. A ring-shaped seal member 23f is provided which slides in contact with the outer circumferential surface of the seal so as to prevent oil leakage between the ports 23c.

In the rotor 23b, a plurality of passages 23d are formed in the axial direction, and the upper ends of the passages 23d are opened on the upper end surface of the rotor 23b, and the lower ends are on the housing 23a side. It communicates with each port 23c of.

Each port 23c on the side of the housing 23a has a traveling motor 5 provided on the traveling body 1 side by a conduit 28, and conversion means for converting the speed stage of the traveling motor 5 (not shown). The passage 23d, which is connected to the upper end surface of the rotor 23b, is connected to a control valve 24 provided on the swinging structure 2 side by a pipe 29.

And the rotor 23b of the swivel joint 23 is stopped by the rotation body 2 side by the rotation preventing device 26 so that it may rotate integrally with the swing body 2.

As shown in Figs. 2 to 4, the rotation preventing device 26 is provided with a rotation preventing member 26a in the tangential direction of the rotor 23b.

The anti-rotation member 26a is formed in the rectangular shape by the steel plate, and one end side is being fixed to the installation part 23g protrudingly connected to the upper end part of the rotor 23b by the fixing tool 31. As shown in FIG.

The other end side of the rotation preventing member 26a is fitted into the engaging hole 26b provided 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 provided at a position where the rotation preventing member 26a provided in the tangential direction of the rotor 23b and the main frame 10a are orthogonal, and are slightly larger than the cross-sectional shape of the rotation preventing member 26a. In addition, it is formed in an elongated shape in the front and rear direction, and a slight gap is formed between the rotation preventing member 26a, so that the swivel joint 23 can absorb the dimensional error to the main frame 10a. have.

Moreover, the orthogonal position of the main frame 10a of the rotation prevention member 26a provided in the connection direction of the rotor 23b is the turning wheel 30 which supports the turning body 2 freely as shown in FIG. The main frame 10a is located at the position farthest from the most loaded part that intersects, and affects the strength of the main frame 10a even when the locking hole 26b is provided in the main frame 10a. Because of this small amount, it is not necessary to increase the rigidity by increasing the plate thickness of the main frame 10a or to reinforce it with the reinforcing material.

In Fig. 4, reference numeral 32 denotes a thrust receiving which restricts the movement of the rotor 23b in the thrust direction. The projection (protruding from the thrust receiving portion 31) is formed in the annular groove 32b formed at the lower end of the rotor 23b. 32a) is fitted to support the thrust force acting on the rotor 23b, thereby restricting the movement of the rotor 23b in the thrust direction.

Next, the operation of the anti-rotation device of the swivel joint will be described.

The hydraulic excavator is driven by the hydraulic oil discharged from the hydraulic pump 22 provided on the swinging structure 2 side, or the work machine 11 or the swinging structure 2 is driven and discharged from the hydraulic pump 22. The hydraulic oil is supplied to the cylinders 13, 14, 16 and the swing motor of the work machine 11 via the control valve 24, and travels through the swivel joint 23 provided at the pivot center of the swing body 2. It is supplied to the traveling motor 5 provided in the sieve 1.

When the swinging body 2 is turned during the operation, the rotation preventing means 26 is attached to the vehicle body frame 10 of the swinging body 2 with respect to the housing 23a fixed to the center frame 3a of the traveling body 1. Although the rotor 23b stopped by the relative rotation rotates, even if the rotor 23b rotates, the passage 23d on the rotor 23b side and the port 23c on the housing 23a side are always in communication with each other. In order to be able to continue supplying hydraulic oil to the traveling motor 5 on the traveling body 1 side even during the turning of (2), the working body 10 may also work while traveling by the traveling body 1, 2) turn is possible.                     

Moreover, when the revolving body 2 is rotated, the rotation preventing member 26 which allows the rotor 23b to rotate integrally with the revolving body 2 is one end side of the main frame 10a of the vehicle body frame 10. It consists only of the rotation preventing member 26a fitted in the perforated stopping hole 26b, and does not require another member such as a conventional stopper, so that it is possible to reduce the number of parts and to install the stopper accurately in a narrow space. The work to do this becomes unnecessary.

Moreover, although the said embodiment demonstrated the case implemented to the hydraulic excavator, it is applicable also to construction machines, such as a track crane and a crawler carrier which have a turning body. In addition, although the stop hole 26b was formed in the position which orthogonally rotates the rotation preventing member 26 and the main frame 10a, the most load which the rotation body 30 and the main frame 10a cross | intersect is The same effect can be obtained even if the stopper hole is formed at an obliquely intersecting position in the range away from the caught part.

As described in detail above, the present invention provides a locking hole formed in the main frame constituting the vehicle body frame of the swinging body, and further secures one end to the rotor of the swivel joint provided at the swinging center of the swinging body. By inserting the end into the stop hole, the rotor stops rotating, so that the swivel joint can be prevented without the need for a stopper, which is another member, thereby reducing the number of parts and at the same time surrounding the swivel joint. Since the work of installing the stopper with high precision in a narrow space becomes unnecessary, the number of assembly steps can be reduced.

In addition, since only the stopper is drilled and installed in the main frame, it can be easily and inexpensively carried out, and since the unloading load does not act on the rotor during turning of the swinging body, It does not wear out, thereby improving the durability of the swivel joint and preventing oil leakage.

In addition, one end of the anti-rotation member is fixed in the tangential direction of the rotor, and a locking hole is formed at the position where the anti-rotation member and the main frame intersect, so that the turning wheel and the main frame installed on the bottom of the body frame cross each other. Since the locking hole is formed at a position far enough from the most loaded part, the rigidity of the main frame is not lowered, so that measures such as reinforcing the main frame are unnecessary, so there is no fear of cost increase. .

Claims (3)

In the rotation preventing device of the swivel joint provided in the pivot center of the swinging body freely swinging on the running body, The stopper is formed in the main frame constituting the vehicle body frame of the revolving structure, and the other end of the rotation preventing member, which is fixed at one end to the rotor of the swivel joint, is inserted into the stopper hole. Characterized by stopping the rotation, The one end of the rotation preventing member is fixed in the tangential direction of the rotor, and the stopper is formed by forming the locking hole at the position where the rotation preventing member and the main frame intersect. . On a freely running body, a swing body having a body frame can be freely pivoted, and hydraulic pressure is supplied to the traveling motor provided on the traveling body side from a hydraulic pump provided on the swing body side to the pivot center of the swing body. In the anti-rotation device of the swivel joint in a construction machine such as a hydraulic excavator provided with a swivel joint, The housing of the swivel joint is fixed to the traveling body side, and one end of the rotation preventing member is fixed to the upper part of the rotor rotatably installed in the housing so as to be tangential to the rotor. A construction machine which stops the rotation of the rotor by engaging a stop hole at a position where the main frame constituting the body frame intersects and inserting the other end of the rotation preventing member into the stop hole. Anti-rotation device for swivel joint delete

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