JPH1181372A - Lubricant splash-preventing device for pin coupling part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pin coupling part with a lubricant splash-preventing cover and to facilitate a mounting work for a lubricant splash-preventing cover and to facilitate a work to mount the lubricant splash-preventing cover. SOLUTION: A flying preventing cover 19 formed of a flexible resin material is arranged on the coupling part 16 side located between a boss part 10 of a boom 7 and a boom cylinder 11. The splash-preventing cover 19 comprises a cover device 20 extending axially of a coupling pin 17 to surround a mounting eye 11C of a rod 11B from the outside in an axial direction of a coupling pin 17 surrounding from the outside in a radial direction; and a cover plate 23 removably mounted on the opening end side of the cover cylinder 20. Further, a rod insertion fit-in part 20A mounting on the tip side of the rod 11B with interference is radially protruded. Further, a slit 21 to radially separate the cover cylinder 20 is formed on the lower end side of the cover cylinder 20 along an axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil scattering prevention device for a pin joint, which is suitably used for a working device of a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
A working device comprising a boom, an arm, a bucket, and the like rotatably connected to each other on the front side of the upper revolving unit, wherein the boom, the arm, and the bucket are respectively provided with cylinders such as a boom cylinder, an arm cylinder, and a bucket cylinder. A device is provided. For example, by operating a boom cylinder, the boom is rotated (elevated) on the front side of the upper swing body, or by operating the bucket cylinder, the bucket is rotated on the tip side of the arm. And excavation work for earth and sand.

Here, the boom cylinder has a mounting eye provided at the tip of a rod thereof, which is pin-connected to a boss of a boom as a mating member via a connecting pin. A lubricating agent such as grease is supplied to the pin connection portion between the boom and the boom cylinder, and the two are smoothly rotated relative to each other.

However, when the boom cylinder is operated during excavation work or the like, the lubricating oil is discharged from the pin joint of the mounting eye at the rod end of the boom cylinder due to the relative rotation of the boom cylinder and the boom cylinder. The part may be scattered or drooping on the cabin of the cab, for example,
In this case, there is a problem in that the cabin and the like are contaminated with the lubricating oil and the appearance is impaired.

In order to solve such a problem, Japanese Unexamined Utility Model Publication No. 3-42840 (hereinafter referred to as another prior art) discloses a method of preventing lubricating oil from scattering from the pin joint to the outside. There has been proposed a lubricating oil scattering prevention device in which a scattering prevention cover is provided integrally with a mounting eye side of a boom cylinder.

In another conventional technique, a scattering prevention cover integrally formed in a closed cylindrical shape is covered from the outside on a pin connecting portion of a mounting eye at a rod tip side of a boom cylinder, and an opening end side of the cover is covered with the cover. By sliding around the boss of the boom, the pin joint is covered with the cover.

[0007]

By the way, in the lubricating oil scattering prevention cover of the pin connecting portion according to the other prior art described above, the opening end side of the cover is cut out in a substantially U-shape at a position corresponding to the rod. The distal end of the rod is inserted into the cover, and a rubber seal or the like is interposed between the cover and the rod to prevent leakage of lubricating oil from between the two.

For this reason, it is necessary to install a rubber seal in the gap between the cover and the rod without any gap. This complicates the mounting structure of the rubber seal, and the mounting operation when the cover is mounted together with the rubber seal on the pin connecting portion. However, there is a problem that the overall workability is reduced.

In addition, when lubricating the pin joints, it is necessary to visually check the leakage of the lubricating oil and determine whether or not the lubricant has been sufficiently filled. The cover must be removed from the pin connection portion in advance so that the cover is not in the way, and the work of attaching and detaching the cover takes extra time and labor, and the workability at the time of greasing is reduced. is there.

[0010] Further, the cover slides on the boss portion of the boom by sliding the opening end side thereof to the boss portion of the boom, following the expansion and contraction of the rod. However, in other prior arts, the opening end side of the cover is merely fitted into an annular groove formed around the boss of the boom,
Since the sliding resistance between the cover and the boss is relatively large, the sliding characteristics of the cover are reduced, and the cover is abraded or damaged early.

The present invention has been made in view of the above-mentioned problems in the prior art, and the present invention provides an excavating work by providing a lubricating oil scattering prevention cover at a pin joint between a mounting eye of a cylinder device and a counterpart member. The lubricating oil at the pin joints can prevent the lubricating oil from scattering from the pin joints to the outside at times, and can easily perform the mounting work when attaching the scattering prevention cover to the pin joints. It is intended to provide a scattering prevention device.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pin connecting portion in which a mounting eye of a cylinder device is connected to a counterpart member via a connecting pin, In order to prevent the lubricating oil lubricated between the mounting eye and the connecting pin from scattering to the outside, a lubricating oil scattering prevention device at the pin connection portion comprising a scattering prevention cover provided on the mounting eye side of the cylinder device is employed. doing.

A feature of the structure adopted in the first aspect of the present invention is that the scattering prevention cover is formed as a cylindrical cover having a slit made of a flexible resin material, and is opened through the slit. In this configuration, the mounting eye is disposed so as to surround the mounting eye from the outside.

According to the above configuration, when attaching the scattering prevention cover to the pin connecting portion between the cylinder device and the counterpart member, first, the tubular cover made of a flexible resin material is pulled so as to expand through the slit, and this is pulled. In this state, the cylindrical cover is arranged on the mounting eye side of the cylinder device. And
By releasing the pulling force on the cylindrical cover in this state, the cylindrical cover is closed between the slits, and the cylindrical cover can be easily attached to the mounting eye so as to surround the mounting eye from the outside. .

A feature of the structure adopted by the invention of claim 2 is that the scattering prevention cover is formed as a cylindrical body having a slit made of a flexible resin material, and one end in the axial direction slides on the counterpart member. The cover cylinder is mounted around the mounting eye in contact with and expanded through the slit, and the lid is configured to close and open the other end of the cover cylinder in an openable and closable manner.

Thus, when the scattering prevention cover is attached to the pin coupling portion, the cover cylinder is expanded through the slit, so that the cover cylinder can be easily attached to the pin coupling portion as in the first aspect. it can. In addition, when lubricating oil is supplied to the pin joint, by removing the cover of the scattering prevention cover from the cover cylinder in advance, it is possible to prevent the lubricant from seeping out of the pin joint from the other end of the cover cylinder. Can be easily confirmed visually.

Further, in the invention according to claim 3, the mounting eye is provided on a rod tip side of the cylinder device, and the cover cylinder is attached to the rod tip portion of the cylinder device with a tight fit on the rod tip side. Is formed.

Thus, a liquid-tight seal can be provided between the rod tip side of the cylinder device and the rod insertion portion of the cover cylinder.
Leakage of lubricating oil from between the two can be prevented.

Further, in the invention according to claim 4, the counterpart member is formed of a cylindrical boss member having a pin hole formed on the inner peripheral side for inserting the connecting pin, and is formed on the outer peripheral side of the boss member. Has a structure in which an annular sliding ring with which one end of the cover cylinder is slidably engaged is integrally mounted.

As a result, as the rod of the cylinder device expands and contracts, one end of the cover cylinder slides along a slide ring provided on the outer peripheral side of the boss member.
The sliding characteristics of the cover cylinder with respect to the boss member can be improved.

On the other hand, according to the invention of claim 5, a lubricating oil adsorbent for adsorbing lubricating oil leaked from the pin connecting portion is provided in the scattering prevention cover.

With this, the lubricating oil leaked from the pin connecting portion can be adsorbed by the lubricating oil adsorbent in the scattering prevention cover,
Leakage of lubricating oil from the scattering prevention cover can be further prevented.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a hydraulic excavator according to an embodiment of the present invention;

FIGS. 1 to 4 show a first embodiment of the present invention. In the drawing, reference numeral 1 denotes a lower traveling body of a hydraulic shovel, 2 denotes an upper revolving body which is pivotally mounted on the lower traveling body 1, and the upper revolving body 2 has a revolving frame 3 on the revolving frame 3. Cab 4 and machine room 5
Etc. are provided.

Reference numeral 6 denotes a working device provided at the front of the upper revolving unit 2 so as to be able to move up and down. The working device 6 includes a boom 7 pin-connected to the revolving frame 3 of the upper revolving unit 2 and a boom 7 The arm 8 is roughly constituted by an arm 8 pin-connected to the distal end of the arm 7 and a bucket 9 pin-connected to the distal end of the arm 8.

Here, as shown in FIG.
Boss portions 10 as boss members located on both left and right sides thereof,
The boss 10 has a pin hole 10A on the inner peripheral side into which a connecting pin 17 described later is inserted, and the outer peripheral side is fixed to the boom 7 by welding or the like. The boss 10 is attached to a mounting eye 11 of a boom cylinder 11 described later.
A counterpart member for C is formed.

Reference numerals 11 and 11 denote left and right boom cylinders pin-connected to the revolving frame 3 and the boom 7, 12 denotes an arm cylinder pin-connected to the boom 7 and the arm 8, and 13 denotes a pin connection to the arm 8 and the bucket 9. Bucket cylinders, each of these cylinders 11, 1
Reference numerals 2 and 13 constitute a cylinder device of the excavator.

As shown in FIGS. 1 and 2, for example, the boom cylinder 11 has a tube 11A in which a piston (not shown) is slidably inserted, and a piston 11A having one end on the inside of the tube 11A. Rod 11B, which is fixed to the other end and protrudes from the inside of the tube 11A to the outside by hydraulic oil supplied and discharged into the tube 11A.
It is composed of

At the upper end (the other end) of the rod 11B and the lower end of the tube 11A, a mounting eye 11C or the like in the form of a ring is integrally formed, and an inner peripheral side of the mounting eye 11C is formed. The bush 14 into which the connecting pin 17 is slidably fitted is fitted. The mounting eye 11C and the bush 14 are provided with a grease injection path 15 for supplying lubricating oil to the sliding surface between the connecting pin 17 and the bush 14 from outside.

The mounting eye 11C is provided in a state of sliding contact with the boss 10 and is connected to the boss 10 of the boom 7 via the connecting pin 17 so that the mounting eye 11C is provided together with the boss 10 and the connecting pin 17. Boom 7 and boom cylinder 11
And a pin connecting portion 16.

Here, a part of the lubricating oil filled between the sliding surfaces between the bush 14 and the connecting pin 17 is supplied between the sliding surfaces between the mounting eye 11C and the boss portion 10, and The sliding resistance between the surfaces is reduced. This point is the stopper 1 described later.
The same applies to the sliding surface between the mounting eye 8 and the mounting eye 11C.

17 is a rod 11B of the boom cylinder 11.
The connecting pin 17 is rotatably connected to the boom 7, and the connecting pin 17 is supported on both sides thereof by the respective bosses 10 of the boom 7, and both ends protruding from the respective bosses 10 are interposed via the respective bushes 14. Mounting eye 11C for each boom cylinder 11
It is slidably inserted in the inside. And the connecting pin 17
The stoppers 18 are attached to both ends of the base member in a state where the stoppers 18 and 18 are stopped.
The connecting pin 17 is held in a retaining state by contacting the end face of the connecting pin 17.

Here, the connecting pin 17 and the bush 14
Lubricating oil such as grease is periodically filled from a grease nipple 25 described later between the sliding surfaces of the
Is smoothly rotated relative to the connecting pin 17.

Then, next, the boom 7 and the boom cylinder 1
The lubricating oil scattering prevention device used for the pin connecting portion 16 with the pin 1 will be described with reference to FIGS.

Reference numerals 19, 19 denote scattering prevention covers integrally provided on the mounting eye 11C side of each boom cylinder 11, and the scattering prevention cover 19 is a cylindrical cover comprising a cover tube 20 and a cover plate 23 described later. Is configured as When the lubricating oil supplied to the pin connecting portion 16 leaks from between the sliding surfaces between the boss portion 10 and the mounting eye 11C, the scattering prevention cover 19 removes the lubricating oil leaking into the inside. The lubricating oil is trapped (stored) and is prevented from scattering to the outside.

Reference numeral 20 denotes a rod 11B of the boom cylinder 11.
In the cover cylinder provided on the distal end side, the cover cylinder 20 is formed as a cylindrical body having a slit 21 described later from a flexible resin material such as rubber or plastic, as shown in FIGS. . The cover cylinder 20 extends in the axial direction of the connecting pin 17 so as to surround the mounting eye 11C of the boom cylinder 11 from the outside in the radial direction, and a rod insertion portion 2 into which the rod 11B is inserted at a position in the circumferential direction.
0A protrudes in the radial direction.

One end of the cover cylinder 20 in the axial direction is an annular protrusion 20B protruding radially inward, and four circumferentially spaced apart from the outer periphery of the open end 20C at the other end in the axial direction. Are protrudingly provided. Further, a lubrication hole 20E into which a grease nipple 25 described later is inserted is bored at an intermediate portion in the axial direction of the cover cylinder 20 as shown by a dotted line in FIG.

Here, a slit 21 is formed in the cover tube 20 at a position corresponding to the rod insertion portion 20A, as shown in FIG.
The slit 21 has a first separating portion 21A axially extending from one end of the annular projecting portion 20B toward the rod insertion portion 20A, and is bent substantially in an L-shape from the distal end of the separating portion 21A. And a second separating portion 21B axially extending therefrom toward the lower end of the rod insertion portion 20A. A fitting projection 22A extending along the slit 21 is formed on one end face of the two end faces of the cover cylinder 20 separated by the slit 21, and the other end face corresponds to the fitting projection 22A. As a result, a fitting recess 22B is formed.

Thus, the cover cylinder 20 is
The slits 21 are widened by applying a tensile force to the cover cylinder 20 as described later, and are mounted around the pin coupling portion 16 in this state. Things. Further, in a state where the tensile force applied to the cover cylinder 20 is released, the fitting convex portion 22 </ b> A is formed by the elastic restoring force of the cover cylinder 20.
B, the rod insertion portion 20
A is fitted to the outer periphery of the end of the rod 11B of the boom cylinder 11 with an interference.

Further, the annular projection 20B of the cover cylinder 20 is slidably slidably contacted with the outer peripheral side of the boss 10 with a tight allowance. When the mounting eye 11C is relatively rotated with respect to the boom 7 as the boom cylinder 11 is expanded and contracted, the cover cylinder 20 is rotated by the annular projection 20B with respect to the boss 10 in the circumferential direction. A liquid-tight state is maintained between the unit 10.

Reference numeral 23 denotes a lid plate as a lid detachably provided on the opening end 20C side of the cover cylinder 20.
As shown in FIGS. 2 and 4, for example, an annular cutout groove is formed on the inner peripheral side of the closed end on the inner peripheral side of the closed end, for example, with a flexible resin material having an inner diameter corresponding to the cover cylinder 20. 23A are formed. Then, the lid plate 23 is configured to close and open the open end 20C side of the cover cylinder 20 in a state where the respective projections 20D of the cover cylinder 20 are fitted in the cutout grooves 23A.

Reference numerals 24, 24 denote lubricating oil adsorbents provided in the respective scattering prevention covers 19, and each lubricating oil adsorbent 25
Is formed of a foamable resin material such as a sponge, and the pin connection portion 16 captured in the scattering prevention cover 19 is formed.
Adsorbs lubricating oil from

Reference numerals 25, 25 denote grease nipples serving as greasing tools provided on the mounting eyes 11C of the respective boom cylinders. The grease nipples 25 are connected to the mounting eyes 11C such that the base end thereof communicates with the grease injection path 15. It is screwed, and the tip side projects outside through the greasing hole 20E of the cover cylinder 20. And the grease nipple 25
The lubrication oil from a grease tank (not shown) mounted on the revolving frame 3 is connected to the connection pin 17 and each mounting eye by connecting a greasing pipe or the like to the protruding end side (tip side). It is injected between the sliding surfaces with 11C.

The lubricating oil scattering prevention device for the pin connecting portion 16 according to the present embodiment has the above-described configuration, and its operation will be described next.

First, the tube 11 of the boom cylinder 11
When the pressurized oil is supplied and discharged into A, the rod 11B
A telescopic operation is performed on A, and the boom 7 is rotated with respect to the revolving frame 3 following this, whereby the entire working device 6 is raised and lowered on the front side of the upper revolving unit 2.

At this time, the space between the bush 14 (mounting eye 11C) of the boom cylinder 11 and the sliding surface between the connecting pin 17 is periodically filled with lubricating oil from the outside via a grease nipple 25 or the like. The mounting eye 11
C smoothly rotates relative to the connecting pin 17.

Next, the method of attaching the scattering prevention cover 19 will be described. First, the lower side of the cover cylinder 20 is pulled in the directions of arrows F and F 'shown in FIG. The cover cylinder 20 is bent until is larger than the outer diameter of the rod 11B. Then, in this state, the rod 11B is inserted and arranged in the rod insertion portion 20A via the gap between the slits 21.

Next, arrows F,
By releasing the pulling force in the F ′ direction, the cover cylinder 20 made of a flexible resin material such as rubber can
The end faces along are abutted without gaps. At this time, the fitting protrusion 22A provided at the position of the slit 21 is fitted into the fitting recess 22B, whereby the slit 2
One space can be sealed in a liquid-tight manner.

Further, the rod insertion portion 20A is
By being mounted on the outer periphery of the distal end side of the rod 11B with a tight allowance, the space between the rod 11B and the rod insertion portion 20A can also be sealed in a liquid-tight manner. Further, the annular projection 20B of the cover cylinder 20 can be slid in contact with the outer peripheral side of the boss 10 with a tight allowance.
The space between B and the boss 10 can be sealed.

Finally, the cover plate 23 is attached to the opening end 20C side of the cover cylinder 20, and the opening end 20C is closed.
In this case, the projections 20D of the cover tube 20 are engaged with the cutout grooves 23A of the cover plate 23, so that the cover plate 23 can be prevented from falling off and the adhesion of the cover plate 23 to the cover tube 20 can be enhanced. The sealing property between the cover cylinder 20 and the cover plate 23 can be improved.

Thus, in this embodiment, by attaching the scattering prevention cover 19 to the mounting eye 11C side of the pin connecting portion 16, the bush 14 of the mounting eye 11C and the boss portion of the boom 7 can be used when the boom cylinder 11 is operated. Even if the lubricating oil leaks out from between the sliding surfaces with the lubricating oil 10, the lubricating oil can be trapped in the scattering prevention cover 19, whereby the leaked lubricating oil is deposited on the outer surface of the cab 4. Spattering can be prevented, and good appearance can be maintained.

Therefore, according to the present embodiment, when the scattering prevention cover 19 is attached to the pin connecting portion 16, the cover cylinder 20 is expanded and contracted through the slit 21,
The rod 11B of the boom cylinder 11 is
A, with the cover tube 20 inserted into the
6 can be arranged. This eliminates the need for specially providing a separate member such as a rubber seal between the rod 11B and the rod insertion portion 20A as in the above-described other related art, and can improve workability when the cover cylinder 20 is attached.

Further, at the time of lubrication to the pin connecting portion 16, the cover plate 23 can be removed from the cover cylinder 20 in advance, and in this state, the operator can open the end 20 of the cover cylinder 20.
By looking into the pin connecting portion 16 side from the C side, the boom 7
The leakage of the lubricating oil from the sliding surface between the boss portion 10 and the bush 14 of the mounting eye 11C can be easily confirmed visually.

This eliminates the need for the worker to remove the entire anti-scattering cover 19 from the pin connecting portion 16 during greasing work, as described in other related arts, thereby reducing the overall work efficiency. Can be enhanced. Then, leakage of lubricating oil from the pin connecting portion 16 between the boom cylinder 11 and the connecting pin 17 can be monitored, and the lubricating oil is
Of the lubricating oil scattering prevention device can be kept more satisfactorily from drooping to the surroundings, the boom 7 side or the rod 11B side of the boom cylinder 11.

Further, since the lubricating oil adsorbent 24 is provided in the scattering prevention cover 19, the lubricating oil leaked from the pin connecting portion 16 can be absorbed, and the leakage of the lubricating oil from the scattering prevention cover 19 can be further prevented. Above, lubricant adsorbent 2
At the time of replacing the cover 4, the cover plate 23 is simply removed from the opening end 20C side of the cover tube 20 and the lubricating oil trapped in the cover tube 20 is not leaked to the outside without scattering the lubricating oil adsorbent 2.
4 can be replaced, and the overall work efficiency can be increased.

Next, FIG. 5 shows a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. It shall be. However, this embodiment is characterized in that the cylindrical projection 33 is integrally formed on the inner peripheral side of the annular projection 32A of the cover cylinder 32 constituting the scattering prevention cover 31, and the outer peripheral side of the boss 10 of the boom 7 is slid. By providing the moving ring 34 integrally, the cylindrical projection 33 of the cover cylinder 32 is slidably contacted with the sliding ring 34.

Here, the scatter prevention cover 31 is configured substantially in the same manner as the scatter prevention cover 19 according to the first embodiment, including a cover cylinder 32 and a cover plate (not shown). An annular protrusion 32A is integrally formed at one end in the direction. However, the second embodiment differs from the first embodiment in that a cylindrical projection 33 is integrally formed on the inner peripheral side of the annular projection 32A of the cover cylinder 32 in the axial direction.

The sliding ring 34 is formed as a cylindrical body from a resin material having, for example, excellent wear resistance and slidability, and is fixed to the outer peripheral side of the boss 10. And
The sliding ring 34 has bent portions 34A, 34A whose both ends in the axial direction are bent radially outward. Each bent portion 34A has its outer peripheral end bent further inward. The cylindrical projection 33 is slidably held on the slide ring 34 in a state where the cylindrical projection 33 is engaged between the two.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those in the first embodiment can be obtained. In the present embodiment, in particular, the cylindrical projection 33 is slid. Since the sliding ring 34 is slidably engaged with the moving ring 34, the sliding resistance between the cylindrical projection 33 and the sliding ring 34 can be reduced, and the cover cylinder follows the expansion and contraction operation of the rod 11B (boom cylinder 11). 32 can be smoothly slid with respect to the sliding ring 34, and the durability of the cover tube 32 can be increased to extend the life and the like.

Next, FIG. 6 shows a third embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. It shall be. However, a feature of the present embodiment is that the cover cylinder 42 constituting the scattering prevention cover 41 is fastened to the tip end side of the rod 11B of the boom cylinder 11 by the clamp member 45.

Here, the scatter prevention cover 41 is configured in substantially the same manner as the scatter prevention cover 19 according to the first embodiment, including a cover cylinder 42 and a cover plate (not shown). The cover cylinder 42 has a rod insertion portion 42A, an annular protrusion 42B, and the like.
3 are provided. However, an annular projection 44 projects radially outward from the tip (lower end) side of the rod insertion portion 42A of the cover cylinder 42.

The clamp member 45 has a half-split structure with a pair of clamp portions 45A, 45A. Each of the clamp portions 45A corresponds to the rod 11B of the boom cylinder 11 from a flexible resin material or the like. It is formed in a semicircular shape with a curvature. Further, each of the clamp portions 45A is integrally formed with a hook portion 45B having a substantially U-shaped cross section, and the cover tube 42 is fitted by fitting the annular projection 44 of the cover tube 42 into the hook portion 45B. It is kept in the retaining state.

The clamp member 45 fastens the rod insertion portion 42A to the rod 11B by attaching each clamp portion 45A to the outer periphery of the distal end side of the rod 11B via a fastening ring (not shown) or the like. It is configured to be worn.

Thus, in the present embodiment configured as described above, substantially the same operation and effects as those of the first embodiment can be obtained. Rod insertion part 4 of cover 41
2A can be brought into close contact with the rod 11B of the boom cylinder 11 in a state of being strongly pressed, and the rod insertion portion 42A
Sealability between the rod and the rod 11B can be further improved.
Further, the clamp member 45 can be used as a protective cover for the rod 11B, and the outer peripheral surface of the rod 11B can be protected from rocks and the like.

In each of the above embodiments, the scattering prevention cover 19 (31, 41) is replaced with the cover cylinder 20 (32, 42).
And the cover plate 23, etc., but the scattering prevention cover 19 (31, 41) is used instead.
May be a covered cylindrical body in which the lid is formed integrally with a flexible resin material.

In each of the above embodiments, the cover plate 23 and the like of the scattering prevention cover 19 (31, 41) are described as being formed from a flexible resin material. It may be formed from a hard material such as a metal material.

Further, in each of the above embodiments, the cover cylinder 20 (32, 4) of the scattering prevention cover 19 (31, 41) is used.
2) is described as being in sliding contact with the boss 10 side of the boom 7, but instead of this, the cover cylinder 20 (32, 42)
May be fixed to the boss 10 side with an adhesive or the like. In this case, by forming the scattering prevention cover 19 (31, 41) from rubber or the like having excellent flexibility, the scattering prevention cover 19 follows the expansion and contraction operation of the boom cylinder 11.
(31, 41) The entire boss 10
There is no breakage or damage to the joint between the cover cylinder 20 and the cover cylinder 20 (32, 42).

Further, in each of the above embodiments, the scattering prevention cover 19 (31, 41) is described as being provided on the mounting eye 11C side of the rod 11B (boom cylinder 11). Cover 19 (31,
41) may be mounted around a mounting eye provided on the base end side of the tube 11A. Further, it may be provided on the mounting eye side of the arm cylinder 12 or the mounting eye side of the bucket cylinder 13.

In each of the above embodiments, the lubricating oil scattering prevention device is described as being applied to a hydraulic excavator. However, the present invention is not limited to this, and is provided in another construction machine such as a hydraulic crane. You may apply to the pin connection part of a working device.

[0070]

As described above in detail, according to the present invention, the lubricating oil supplied to the pin joint between the mounting eye of the cylinder device and the mating member is prevented from scattering to the outside. A scattering prevention cover is provided on the mounting eye side of the cylinder device in order to prevent the scattering prevention cover from being opened by forming the scattering prevention cover as a cylindrical cover having a slit with a flexible resin material. Since it is configured to be attached to the mounting eye side, the scattering prevention cover can be easily mounted around the pin joint portion in a state where the scattering prevention cover is in close contact with the counterpart member side and the mounting eye side. This eliminates the need for specially providing a separate member such as a rubber seal between the scattering prevention cover and the counterpart member as in the above-described other related arts, thereby improving workability when assembling the scattering prevention cover. it can. Further, the sealability between the shatterproof cover and the counterpart member and between the shatterproof cover and the mounting eye can be improved, and the leakage of the lubricating oil from the pin joint portion trapped in the shatterproof cover to the outside can be ensured. The lubricating oil scattering prevention device can maintain good appearance.

According to the second aspect of the present invention, the scattering prevention cover is formed of a cover cylinder formed of a flexible resin material as a cylindrical body with a slit, one end of which in the axial direction is in sliding contact with a mating member. The lid is configured so that the other end of the cylinder is openably and closably closed, so that the cover cylinder of the scattering prevention cover is opened through a slit to improve the assemblability of the cover cylinder. Can be increased as well. In addition, by removing the cover of the scattering prevention cover from the cover cylinder in advance when lubricating the pin joint, the operator can easily check the leakage of lubricating oil from the pin joint visually, Leakage can be minimized, and the leaked lubricating oil can be captured (stored) in the cover cylinder, and the appearance around the pin joints can be kept good without being stained with lubricating oil. Can be. In addition, as described in other related arts, it is possible to omit troublesome work such as removing the entire anti-scattering cover from the pin joint portion at the time of greasing work or the like, thereby improving the overall work efficiency.

Further, according to the third aspect of the present invention, the mounting eye is provided on the tip end of the rod of the cylinder device, and the cover cylinder is formed with a rod insertion portion which is attached to the tip end of the rod of the cylinder device with an interference. As a result, the rod end of the cylinder device and the rod insertion portion of the cover cylinder can be sealed in a liquid-tight manner, and the leakage of lubricating oil from between the two can be reliably prevented. Can be kept better.

Further, in the invention of claim 4, the counterpart member is constituted by a cylindrical boss member having a pin hole for a connecting pin formed on the inner peripheral side, and a cover is formed on the outer peripheral side of the boss member. Since one end of the cylinder is slidably engaged with an annular slide ring, the one end of the cover cylinder is smoothly moved along the slide ring as the rod of the cylinder device is expanded and contracted. The cover cylinder can be slid, so that the durability of the cover cylinder can be increased and the life and the like can be extended.

On the other hand, in the invention of claim 5, since the lubricating oil adsorbent for adsorbing the lubricating oil leaked from the pin connecting portion is provided in the scattering prevention cover, the lubricating oil trapped in the scattering prevention cover is removed. It can be adsorbed by the lubricating oil adsorbent, and leakage to the outside can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is an external view showing a hydraulic shovel to which a lubricating oil scattering prevention device for a pin joint according to a first embodiment of the present invention is applied.

FIG. 2 is an enlarged cross-sectional view showing a pin connecting portion between the boom and the boom cylinder as viewed from the direction of arrows II-II in FIG.

FIG. 3 is a right side view of FIG. 2 showing a state in which a cover plate is removed from a cover cylinder.

FIG. 4 is an exploded perspective view showing the scattering prevention cover in FIG. 3 in an enlarged manner.

FIG. 5 is an enlarged sectional view of a main part showing a cover cylinder and the like by a lubricating oil scattering prevention device for a pin connection part according to a second embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part showing a cover cylinder and the like by a lubricating oil scattering prevention device for a pin joint according to a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 7 boom (counterpart member) 10 boss (boss member) 10A pin hole 11 boom cylinder (cylinder device) 11B rod 11C mounting eye 16 pin coupling part 17 connecting pin 19, 31, 41 scattering prevention cover 20, 32, 42 cover cylinder 20A, 42A Rod insertion portion 20B, 32A, 42B Annular protrusion 20C Open end 21, 43 Slit 23 Cover plate (cover) 24 Lubricant adsorbent 34 Sliding ring

Claims (5)

[Claims] 1. A pin connecting portion connecting a mounting eye of a cylinder device to a counterpart member via a connecting pin, and lubricating oil supplied between the mounting eye of the pin connecting portion and the connecting pin scatters to the outside. In the lubricating oil scattering prevention device of the pin connection part comprising a scattering prevention cover provided on the mounting eye side of the cylinder device, the scattering prevention cover has a cylindrical shape having a slit made of a flexible resin material. A lubricating oil scattering prevention device for a pin joint portion, wherein the lubricating oil scattering device is configured to be formed as a cover and to be disposed so as to surround the mounting eye from the outside in a state where the mounting eye is expanded through the slit. 2. A pin connecting portion formed by connecting a mounting eye of a cylinder device to a counterpart member via a connecting pin, and lubricating oil supplied between the mounting eye of the pin connecting portion and the connecting pin scatters to the outside. In the lubricating oil scattering prevention device of the pin connection part comprising a scattering prevention cover provided on the mounting eye side of the cylinder device, the scattering prevention cover has a cylindrical shape having a slit made of a flexible resin material. A cover cylinder that is formed as a body, one end in the axial direction is in sliding contact with the counterpart member, and is mounted around the mounting eye in a state of being expanded through the slit, and the other end of the cover cylinder is opened and closed A lubricating oil scattering prevention device for a pin connection portion, wherein the device comprises a lid that closes as much as possible. 3. The mounting eye is provided on a rod tip side of the cylinder device, and the cover cylinder is formed with a rod insertion portion that is attached to the rod tip side of the cylinder device with an interference. 3. The lubricating oil scattering prevention device for a pin joint according to 2. 4. The counterpart member comprises a cylindrical boss member having a pin hole formed on an inner peripheral side through which the connecting pin is inserted. One end of the cover cylinder is provided on an outer peripheral side of the boss member. The lubricating oil scattering prevention device for a pin joint according to claim 2 or 3, wherein an annular sliding ring slidably engaged is integrally mounted. 5. The pin connection part according to claim 1, 2, 3 or 4, wherein a lubricating oil adsorbent for adsorbing the lubricating oil leaked from said pin connection part is provided inside said scattering prevention cover. Lubricating oil scattering prevention device.