KR20220136634A - Excavator rotary coupler with built-in replaceable abrasion device - Google Patents

Abstract

The present invention relates to an excavator rotary coupler with a built-in replaceable abrasion device. The excavator rotary coupler comprises: an arm connection part linked to an end of an arm of an excavator; a fixed body including a fixed case coupled to the arm connection part to provide a receiving space open downward, and a worm case located on one side of the fixed case and opened to the receiving space; a rotating body including a worm installed in the worm case to be axially rotated by receiving power from a hydraulic motor, a worm wheel located in the receiving space to mesh with the worm, and a power transmission part coupled to the worm wheel to output the rotational force of the worm wheel to the outside; and an abrasion device installed between the fixed body and the rotating body, and worn by itself through a sliding motion relative to abrasion rings during operation of the rotating body while being coupled to the fixed body and the rotating body. Therefore, the excavator rotary coupler can have the abrasion device that wears itself but does not cause wear on the surroundings, thereby maintaining the highest operational precision and being maintained at low cost.

Description

Excavator rotary coupler with built-in replaceable abrasion device

The present invention relates to a rotary coupler mounted on an excavator, which is a heavy equipment for construction, and more particularly, to prevent abrasion of the friction part inside the rotary coupler, to be easily replaced, and to have a self-lubricating function. It relates to a rotary coupler for an excavator.

An excavator, commonly called a fork crane, is an important field equipment that can perform various tasks, such as excavation work to dig the ground, loading work to put soil on a dump truck, shredding work to dismantle buildings, and stationary work to clean the ground.

The excavator has a basic structure of a chassis having an engine, a vehicle body mounted on the chassis and pivotable, a cab located on the vehicle body, a boom connected to the vehicle body and extending in the longitudinal direction, an arm linked to the boom stem, and a bucket mounted to an end of the arm. have

In addition to the bucket, various equipment are detachably connected to the arm as needed. For example, several mounting devices such as a crusher, hammer, breaker, shear, tongs, etc. can be selectively used. The various mounting equipment (commonly referred to as attachments) described above, while being fixed to the arm, is operated by hydraulic pressure output from the hydraulic pressure source of the excavator.

Also, depending on the type of excavator, a rotary coupler is installed between the end of the arm and the attachment. The rotary coupler constitutes the basic configuration of the worm, the worm wheel and the hydraulic motor, and receives the hydraulic pressure transmitted from the hydraulic pressure source and outputs the rotational force to rotate the attachment.

1 is a view showing a state in which the conventional rotary coupler 15 is applied to the excavator 10, and FIG. 2 is a cross-sectional view for explaining the problem of the rotary coupler of FIG.

As shown, the rotary coupler 15 is connected to the arm 11 end of the excavator 10 . The rotary coupler 15 is connected to the arm 11 through the arm connecting portion 12 and the bucket 13 through the attachment connecting portion 17, and rotates the bucket 13 in a required direction.

The rotary coupler 15 includes a fixed case 15e fixed to the arm connection unit 12, a power transmission unit 15g and a worm wheel 15k accommodated in the fixed case 15e, and a side of the fixed case 15e. A worm case (15a) located in the worm case is provided inside the worm case and provided with a worm (15m) meshing with the worm wheel (15k).

The worm 15m is rotated by the hydraulic motor 15c and drives the worm wheel 15k. The power transmission unit 15g is fixed to the inside of the worm wheel 15k and has a lower disk 15p at the lower side. The lower disk (15p) is coupled to the attachment connection (17).

However, since the rotary coupler 15 has a structure that can handle the high load of the attachment as it is, the friction part is easily worn. For example, between the worm case 15a and the worm wheel 15k and between the lower disk 15p and the worm case 15a are intensively worn due to friction during operation.

For this reason, a friction ring 15r for counteracting wear is installed between the friction part inside the rotary coupler, for example, between the lower disk 15p and the worm case 15a. The friction ring 15r is formed by pressing a copper plate having a certain thickness, and takes the form of a ring of a certain diameter.

However, in the conventional rotary coupler 15, the friction ring 15r is sandwiched between the worm case 15a and the lower disk 15p, the worm case 15a, the worm wheel 15k, and the lower disk Since the relative movement with respect to (15p) is possible, there is a problem that the worm case (15a), the worm wheel (15k), and the lower disk (15p) have the opposite effect of abrasion. Of course, although the friction ring 15r is worn the most, it is impossible to prevent wear on the portion in contact with the friction ring.

Domestic Patent Publication No. 10-2020-0133115 (Rotation Quick Coupler for Excavator) Domestic Patent Publication No. 10-1695438 (rotatable quick coupler for excavator)

An object of the present invention is to provide a rotary coupler for an excavator having a built-in replaceable wear device, which has been created to solve the above problems, can maintain the best operation precision, and can be maintained at a low cost.

A rotary coupler for an excavator having a built-in replaceable wear device of the present invention as a means of solving the problem for achieving the above object includes: an arm connection part linked to an arm end of the excavator; a fixing body coupled to the arm connection part and including a fixed case providing an accommodating space open downward and a worm case located at one side of the fixed case and opened into the accommodating space; A worm installed in the worm case and axially rotated by receiving power from a hydraulic motor, a worm wheel located in the receiving space and meshing with the worm, a rotating body having a power transmission unit coupled to the worm wheel and outputting the rotational force of the worm wheel to the outside; ; It is installed between the fixed body and the rotating body, characterized in that provided with a wear device that wears itself through sliding motion relative to each other when the rotating body is operated in a state coupled to the fixed body and the rotating body.

In addition, the wear device; A first wear ring having a certain diameter and thickness and fixed to a fixed body or a rotating body, has the same diameter as the first wear ring, slides in a state of being in contact with the first wear ring, and is mounted on a rotating body or a fixed body It characterized in that it is provided with a second wear ring to engage.

The first wear ring and the second wear ring are respectively installed between the fixed case and the worm wheel, the worm case and the worm wheel, and the worm case and the power transmission unit.

In addition, the first wear ring is arranged at equal intervals along the circumferential direction and has screw holes through which the set screw passes, and the second wear ring is positioned at equal intervals along the circumferential direction and passes the set screw through. It is characterized in that a plurality of screw holes are provided.

In addition, the first wear ring is characterized in that the metal, the second wear ring is made of plastic.

In addition, the fixing screw is a flat head screw, and the screw hole is characterized in that the engaging surface in close contact with the head of the flat head screw is located.

In addition, on the outer circumferential and inner circumferential surfaces of the first wear ring, a side guider protrudes toward the second wear ring and covers the outer circumferential and inner circumferential surfaces of the second wear ring, and prevents eccentricity of the first wear ring with respect to the second wear ring. It is characterized in that it is formed further.

In addition, the second wear ring has a support groove that is opened toward the first wear ring and extends in the circumferential direction, and the first wear ring is supported while being inserted into the support groove of the second wear ring. characterized.

In addition, the second wear ring has a lubricating oil chamber extending in the circumferential direction of the second wear ring, covered by the first wear ring, and accommodating the lubricating oil supplied from the outside, and A seal that is pressed against the screw head and prevents leakage of lubricant is mounted on the engaging surface of the screw hole.

In addition, in the lubricating oil chamber, the second wear ring protrudes toward the first wear ring at regular intervals in the circumferential direction, and when the first wear ring slides with respect to the second wear ring, lubricant is applied to the first wear ring A lifting protrusion for lifting to the side is formed, the first wear ring protrudes into the lubricant chamber, and when the first wear ring slides with respect to the second wear ring, a pushing block that pushes the lubricant in the lubricant chamber toward the lifting protrusion is provided, and a plurality of guide grooves are formed on the contact surfaces of the first wear ring and the second wear ring to receive the lifted lubricating oil and guide them to the contact surface.

The rotary coupler for an excavator having a built-in replaceable wear device of the present invention as described above has a built-in wear device of a structure that only wears itself and does not cause wear around it, so it can maintain the best operation precision and low cost maintenance is possible.

1 is a view showing a state in which a conventional rotary coupler is applied to an excavator.
2 is a cross-sectional view for explaining a problem of the rotary coupler shown in FIG.
3 is a view showing the internal structure of a rotary coupler for an excavator having a built-in replaceable wear device according to an embodiment of the present invention.
Figure 4 is an exploded perspective view of the wear device built in the rotary coupler of Figure 3;
5A and 5B are cross-sectional views showing a modified example of the wear device shown in FIG. 4 .
6 is a cutaway perspective view showing another modified example of the wear device shown in FIG. 4 .
FIG. 7 is a plan view of the second wear ring of FIG. 6 .
8 is a cross-sectional view of the wear device shown in FIG.

Hereinafter, one embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

Basically, the rotary coupler for an excavator according to the present invention has a wear device that is installed in a wear concentration area during operation to prevent wear of other parts, greatly saving maintenance costs, and good operation precision by frequently replacing the wear device can be implemented.

The rotary coupler for an excavator of the present invention includes: an arm connection part linked to an arm end of the excavator; a fixing body coupled to the arm connection part and including a fixed case providing an accommodating space open downward and a worm case located at one side of the fixed case and opened into the accommodating space; A worm installed in the worm case and axially rotated by receiving power from a hydraulic motor, a worm wheel located in the receiving space and meshing with the worm, a rotating body having a power transmission unit coupled to the worm wheel and outputting the rotational force of the worm wheel to the outside; ; It is installed between the fixed body and the rotating body, and has a basic configuration of a wear device that is worn by itself through sliding motion with respect to each other when the rotating body is operated in a state coupled to the fixed body and the rotating body.

3 is a view showing the internal structure of the excavator rotary coupler 30 having a built-in replaceable wear device according to an embodiment of the present invention, and FIG. 4 is a wear device 40 built into the rotary coupler of FIG. 3 . is an exploded perspective view of

Hereinafter, the same reference numerals as the above reference numerals refer to the same members having the same functions.

As shown, the rotary coupler 30 for an excavator according to this embodiment is configured to include an arm connection part 12 , a fixed body, a rotating body, and a wear device 40 .

The arm connection part 12 is linked to the arm end of the excavator, and is coupled to the fixture.

The fixed body includes a fixed case 31 coupled to the arm connection part 12 and providing an accommodation space 31e open downward, and a worm case 35 coupled to the side of the fixed case. In addition, the fixed case 31 is composed of a fixed plate portion (31a) taking the form of a disk of a certain thickness, and a side wall portion (31b) mounted on the edge of the fixed plate portion (31a). The worm wheel 37 is rotatably accommodated in the accommodation space 31e provided by the fixed case 31 .

The worm case 35 is fixed to one side of the fixed case 31 and rotatably accommodates the worm 39 as a space open toward the accommodating space 31e. The coupling of the worm case 35 to the fixed case 31 is a bolting coupling. The worm 39 receives rotational force from an external hydraulic motor (not shown) while being accommodated in the worm case 35 to rotate the shaft. In addition, the worm 39 meshes with the worm wheel 37 . Of course, the worm wheel 37 rotates in both directions by the hydraulic motor.

The fixed case 31 and the worm case 35 form a fixed body while being fixed to the arm connection part 12 .

The rotating body is rotated by a hydraulic motor in a state accommodated in the fixed body, and includes a worm wheel 37 and a power transmission unit 33 . The power transmission unit 33 is fixed to the worm wheel 37 and rotates simultaneously with the worm wheel 37 , and has an upper disk 33a and a lower disk 33b.

The upper disk 33a is a disk-shaped member located above the worm wheel 37 , and the lower disk 33b is located below the worm wheel 37 . The upper disk 33a and the lower disk 33b are coupled to the worm wheel 37 through the coupling bolt 33e with the worm wheel 37 interposed therebetween. The lower disk 33b covers the side wall portion 31b and the lower portion of the worm case 35 . The attachment connection unit 17 is fixed to the power transmission unit 33 , and transmits the rotational force output through the power transmission unit 33 to the attachment.

On the other hand, the wear device 40 is installed between the fixed body and the rotating body, and when the rotating coupler 30 is operated, it prevents abrasion at the friction part. During the operation of the rotary coupler, it is worn by itself through sliding motion with respect to each other.

The wear device 40 is provided between the fixed case 31 and the worm wheel 37 , the worm case 35 and the worm wheel 37 , and the worm case 35 and the power transmission unit 33 , respectively. More specifically, it is positioned between the fixing plate part 31a and the worm wheel 37, the bottom surface of the worm case 35 and the worm wheel 37, and between the worm case 35 and the lower disk 33b.

The wear device 40 plays a basic role of preventing wear due to frictional motion between the fixed body and the rotating body. That is, the fixing plate portion 31a, the worm wheel 37, the worm case 35, and the lower disk 33b are not worn. If the fixing plate part 31a, the worm wheel 37, the worm case 35, and the lower disk 33b itself are worn out, the corresponding part itself is replaced entirely, or the worn part is cut and smoothed to the cut thickness. Since it is necessary to put a thick plate, maintenance is very cumbersome and costs a lot of money.

The wear device 40 according to this embodiment is inserted between the fixed body and the rotating body, and is worn instead of the fixed plate part 31a, the worm wheel 37, the worm case 35, and the lower disk 33b. will be.

The basic structure of the wear device 40 is, as shown in FIG. 4 , a first wear ring 41 , a plurality of set screws 42 , a second wear ring 44 , and a plurality of set screws 45 . is made of The set screws 42 and 45 are flat head screws.

The first wear ring 41 is a ring-shaped member of a certain diameter and thickness made of metal and has a plurality of screw holes 41a. The screw holes 41a are arranged at equal intervals along the circumferential direction of the first wear ring 41 and pass the fixing screws 42 therethrough. A locking surface 41b is formed in the screw hole 41a. The locking surface 41b is an inclined surface to which the head portion (plate head portion) of the set screw 42 is in close contact.

The second wear ring 44 is a ring-shaped member made of plastic and has the same diameter as the first wear ring 41 . The upper surface of the second wear ring 44 is a close contact surface 44f that is in contact with the first wear ring 41 . The contact surface 44f is slidable in a state in which it is in contact with the first wear ring 41 .

In addition, a plurality of screw holes 44a are also provided in the second wear ring 44 . The screw hole 44a is a passage positioned at equal intervals along the circumferential direction of the second wear ring 44, and provides a locking surface 44b. The locking surface 44b is an inclined surface to which the head portion (plate head portion) of the set screw 45 adheres.

The second wear ring 44 is relatively thicker than the first wear ring 41 . However, the thickness of the first wear ring 41 and the second wear ring 44 according to the embodiment may be implemented to be the same.

The first wear ring 41 and the second wear ring 44 face each other in a state of being fixed to a fixed body or a rotating body, respectively, through the set screws 42 and 45, and slide with respect to each other. The first wear ring 41 and the second wear ring 44 may be fixed to either a fixed body or a rotating body. However, when the first wear ring 41 is mounted on the fixed body, the second wear ring 44 is fixed to the rotating body, and when the first wear ring 41 is fixed to the rotating body, the second wear ring 44 is fixed to the rotating body. is attached to the fixture.

The first wear ring 41 and the second wear ring 44, whether a fixed body or a rotating body, are fixed through the fixing screws 42 and 45 and do not move. In other words, there is no friction between the first and second wear rings 41 and 44 and the fixed body, and between the first and second wear rings 41 and 44 and the rotating body, only the first wear ring 41 and the second wear ring (44) There is only mutual friction.

When the first wear ring 41 and the second wear ring 44 slide in close contact with each other, the second wear ring 44 made of plastic is worn. If the second wear ring 44 is worn more than the allowable value, only the second wear ring 44 is simply replaced.

5A and 5B are cross-sectional views illustrating a modified example of the wear device 40 shown in FIG. 4 .

Referring to FIG. 5A , it can be seen that the side guiders 41d are integrally formed on both ends of the first wear ring 41 in the width direction, that is, on the outer circumferential surface and the inner circumferential surface. The side guider 41d is a bent portion integrally formed with both ends of the first wear ring 41 in the width direction, protrudes toward the second wear ring 44 and covers the outer and inner peripheral surfaces of the second wear ring. The side guider 41d prevents eccentricity of the first wear ring 41 with respect to the second wear ring 44 . For example, it is to prevent the first wear ring 41 from departing in the direction of the arrow b or the opposite direction.

The wear device 40 shown in FIG. 5B has a structure in which a support groove 44d is formed on the upper surface of the second wear ring 44, and the first wear ring 41 is inserted into the support groove 44d. have The support groove 44d is opened toward the first wear ring and has a predetermined width and depth extending in the circumferential direction, and accommodates the first wear ring 41 to prevent eccentricity of the first wear ring 41 . The first wear ring 41 is inserted into the support groove 44d, and only rotational movement is possible, but is not separated in the lateral direction.

FIG. 6 is a cutaway perspective view illustrating another modified example of the wear device 40 shown in FIG. 4 , and FIG. 7 is a plan view of the second wear ring of FIG. 6 . In addition, FIG. 8 is a cross-sectional view for explaining the operation of the wear device shown in FIG.

As shown, the lubricating oil chamber 44g is formed in the upper center of the second wear ring 44 . The lubricating oil chamber 44g is an arc-shaped groove extending in the circumferential direction of the second wear ring 44 and opened upward to receive the lubricating oil supplied from the outside. The lubricant chamber 44g is covered by the first wear ring 41 .

In addition, a plurality of lifting projections (44m) are provided on the inner bottom of the lubricating oil chamber (44g). The lifting protrusion 44m is a triangular protrusion forming a predetermined interval in the circumferential direction of the second wear ring 44, and serves to hit the lubricant in the direction of the arrow e. That is, the lubricating oil flowing in the circumferential direction of the first wear ring 44 while being accommodated in the lubricating oil chamber 44g is upwardly lifted.

In addition, a plurality of guide grooves 44e are provided on the contact surface 44f of the second wear ring 44 . The guide groove 44e receives and temporarily accommodates the lubricating oil lifted to the upper part, and raises it to the friction surface of the first wear ring 41 and the second wear ring 44 . The lubricating oil accommodated in the guide groove 44e moves between the friction surfaces of the first wear ring 41 and the second mi wear ring 44 by the surface tension and capillary principle, and the first and second wear rings 41 and 44 ) to reduce the friction load as much as possible and cool the friction surface.

In addition, a plurality of pushing blocks 41f are provided on the bottom surface of the first wear ring 41 . The pushing block 41f is a member protruding into the lubricant chamber 44g while the first wear ring 41 is in close contact with the second wear ring 44 . The lower end of the pushing block (41f) goes down below the liquid level of the lubricant (50).

Therefore, during the sliding motion of the first wear ring relative to the second wear ring (rotational motion of the first wear ring), the lubricant 50 is pushed by the pushing block 41f and flows in the circumferential direction in the lubricant chamber, It bumps into the lifting protrusion (44m) and is lifted upwards.

On the other hand, the seals 41k and 44k are fixed to the engaging surfaces 41b and 44b of all the screw holes 41a and 44a of the first and second wear rings. The seals 41k and 44k are pressed against the flat head of the set screw 42 and serve to prevent leakage of lubricant. The seals 41k and 44k are made of rubber or silicone. In this way, since the screw hole is sealed by the set screw, the lubricant does not leak.

As mentioned above, although the present invention has been described in detail through specific embodiments, the present invention is not limited to the above embodiments, and various modifications are possible by those of ordinary skill within the scope of the technical spirit of the present invention.

10 excavator 11: arm 12: arm connection part
13: bucket 15: rotary coupler 15a: worm case
15c: Hydraulic motor 15e: Fixed case 15g: Power transmission unit
15k: worm wheel 15m: worm 15p: lower disc
17: attachment connection part 30: rotary coupler 31: fixed case
31a: fixing plate 31b: side wall 31e: receiving space
33: power transmission unit 33a: upper disk 33b: lower disk
33e: coupling bolt 35: worm case 37: worm wheel
39: worm 40: wear device 41: first wear ring
41a: screw hole 41b: locking surface 41d: side guider
41f: Pushing block 41k: Seal 42: Set screw
44: second wear ring 44a: screw hole 44b: locking surface
44d: Support groove 44e: Guide groove 44f: Adhesive surface
44g: Lubricant chamber 44k: Seal 44m: Lifting projection
45: set screw 50: lubricant

Claims (10)

an arm connector linked to an arm end of the excavator;
a fixing body coupled to the arm connection part and including a fixed case providing an accommodating space open downward and a worm case located at one side of the fixed case and opened into the accommodating space;
A worm installed in the worm case and axially rotated by receiving power from a hydraulic motor, a worm wheel located in the receiving space and meshing with the worm, a rotating body having a power transmission unit coupled to the worm wheel and outputting the rotational force of the worm wheel to the outside; ;
Replaceable wear device, characterized in that it is installed between the fixed body and the rotating body, characterized in that provided with a wear device that wears itself through sliding motion relative to each other when the rotating body is operated in a state coupled to the fixed body and the rotating body Built-in rotary coupler for excavators. According to claim 1,
The wear device;
A first wear ring having a predetermined diameter and thickness and fixed to a fixed body or a rotating body;
It has the same diameter as the first wear ring, slides in a state of being in contact with the first wear ring, and includes a second wear ring coupled to a rotating body or a fixed body. Rotary coupler for excavators. 3. The method of claim 2,
The first wear ring and the second wear ring,
A rotary coupler for an excavator with a built-in replaceable wear device, characterized in that each installed between the fixed case and the worm wheel, the worm case and the worm wheel, and the worm case and the power transmission unit. 4. The method of claim 2 or 3,
The first wear ring has screw holes arranged at equal intervals along the circumferential direction and through which the set screw passes,
A rotary coupler for an excavator with a built-in replaceable wear device, characterized in that the second wear ring is provided at equal intervals along the circumferential direction and provided with a plurality of screw holes through which the set screw passes. 5. The method of claim 4,
The first wear ring is a metal, and the second wear ring is a rotary coupler for an excavator with a built-in replaceable wear device, characterized in that made of plastic. 5. The method of claim 4,
The set screw is a countersunk screw,
A rotary coupler for an excavator with a built-in replaceable wear device, characterized in that the screw hole has a locking surface in close contact with the head of the flat head screw. 7. The method of claim 6,
Side guiders are further formed on the outer and inner peripheral surfaces of the first wear ring, which protrude toward the second wear ring and cover the outer and inner peripheral surfaces of the second wear ring, and prevent eccentricity of the first wear ring with respect to the second wear ring. A rotary coupler for an excavator with a built-in replaceable wear device, characterized in that. 7. The method of claim 6,
The second wear ring has a support groove that is opened toward the first wear ring and extends in the circumferential direction,
The first wear ring is a rotary coupler for an excavator with a built-in replaceable wear device, characterized in that it is supported while being inserted into the support groove of the second wear ring. 7. The method of claim 6,
In the second wear ring,
A lubricating oil chamber extending in the circumferential direction of the second wear ring, covered by the first wear ring, and accommodating the lubricating oil supplied from the outside is formed,
A rotary coupler for an excavator with a built-in replaceable wear device, characterized in that the sealing surface of the screw hole of the first and second wear rings is pressed against the head of the screw and a seal to prevent leakage of lubricant is mounted. 10. The method of claim 9,
Inside the lubricating oil chamber,
A lifting protrusion is formed that protrudes toward the first wear ring side at regular intervals in the circumferential direction of the second wear ring, and lifts the lubricant to the first wear ring side when the first wear ring slides with respect to the second wear ring,
In the first wear ring,
A pushing block that protrudes into the lubricating oil chamber and moves the lubricating oil in the lubricating oil chamber toward the lifting protrusion when the first wear ring slides with respect to the second wear ring is provided.
A rotary coupler for an excavator with a built-in replaceable wear device, characterized in that a plurality of guide grooves are formed on the contact surface of the first wear ring and the second wear ring to receive the lifted lubricating oil and guide it to the contact surface.

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