JP2001240365A - Hanging hook with oil supply mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hanging hook with an oil supply mechanism capable of supplying oil to the sliding face of each rotary shaft for a hanging hook capable of horizontal rotation around a vertical axis and rocking around a horizontal axis, which is a fulcrum. SOLUTION: In a hanging hook provided with a swivel 22 rotating a hook body 23 around a vertical axis, a pin 21 as a rocking mechanism rocking around a horizontal axis with the hook body 23 hanging downward and a bearing member 20d independently of each other, the sliding sections of the swivel 22 and the pin 21 are communicated to each other through an oil guide passage 22f, and the oil guide passage 22f is further communicated with a grease nipple provided in either the swivel 22 or the rocking mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hanging hook for lifting a load, and more particularly to a hanging hook having a so-called greasing mechanism for supplying grease to a sliding surface of the hook.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show a known structure of a hanging hook.

A first hanging hook shown in FIG.
Reference numeral 30280) has a trunnion 51 functioning as a horizontal axis, a hook main body 52 penetrating the trunnion 51 in the radial direction, and a hook nut 53 screwed into an upper portion of the penetrated hook main body 52. The centering type thrust bearing 5 is provided between the hook nut 53 and the trunnion 51.
4 are provided. The hanging hook 50 is applied to a crane. The hanging hook 50 can rotate the hook main body 52 horizontally by 360 ° with the vertical axis VA as a rotation axis, and can swing in the thickness direction of the paper with the trunnion 51 as a rotation axis. It is configured.

[0004] A greasing hole 51a is formed in the center shaft of the trunnion 51. A grease nipple 55 is provided at one end of the greasing hole 51a, and the other end is provided with a sliding surface. And a hook shaft 52a. Therefore, if lubrication is performed by connecting the grease pump 56 to the grease nipple 55, the lubrication hole 5 can be provided without disassembling the hanging hook 50.
Grease can be easily supplied to the hook shaft portion 51a through 1a. Reference numeral 57 denotes a sheave for lifting and lowering a suspension hook supported by the trunnion 51.

On the other hand, a second hanging hook 60 shown in FIG.
The hook body 61 is suspended from a pin 63 serving as a horizontal axis via a swivel 62, and this pin 63 is supported by a pair of bearings 64 a formed at the lower end of a bracket 64. This hanging hook 60 can also rotate the hook main body 61 horizontally by 360 ° with the vertical axis VA as the rotation axis, and in the thickness direction of the paper with the horizontal axis HA provided independently of the vertical axis VA as the support axis. Can be rocked.

[0006]

Since the lubrication structure of the first suspension hook 50 only lubricates the hook shaft 51a, only one lubrication port is required. However, as shown in the second suspension hook 60, in order to lubricate each of the rubbing surfaces of a plurality of independent rotating shafts, a plurality of pairs of lubrication holes and greasing holes must be provided, and the lubrication structure Is complicated. In addition, labor is required in the greasing work.

Further, when a greasing hole is formed in the bracket 64 to supply grease to the sliding surface of the horizontal shaft 63, there is a problem that the strength of the bracket 64 is reduced.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems of the conventional hanging hook, and is simple for a hanging hook having a plurality of rotating shafts independently on a sliding surface of each rotating shaft. The present invention provides a hanging hook with a greasing mechanism that can perform greasing and can realize a greasing mechanism with a simple configuration.

[0009]

According to a first aspect of the present invention, there is provided a rotating mechanism for rotating a hook body about a vertical axis, and a swinging mechanism for swinging about a horizontal axis while the hook body is suspended. In the independently provided hanging hook, the sliding portion of the rotation mechanism and the swing mechanism is communicated with the oil guide path, and the oil guide path is further communicated with the lubrication port provided in one of the rotation mechanism and the swing mechanism. It is a hanging hook with a greasing mechanism.

[0010] According to a second aspect of the present invention, the rotating mechanism comprises a cylindrical portion for rotatably supporting the shaft portion of the hook main body around the vertical axis, and a shaft protruding from the cylindrical portion on the vertical axis. And a lubrication hook with a greasing mechanism, the swivel having a lubrication mechanism having a shaft part connected to a swing mechanism.

According to a third aspect of the present invention, there is provided a hook support portion for attaching a hook body, wherein a swing mechanism is provided at a lower end portion of the hook support portion with a pin passing through the shaft portion of the swivel, and the pin is pivotally supported. And a lubrication mechanism-equipped suspension hook comprising

According to a fourth aspect of the present invention, there is provided a suspension hook having a lubrication mechanism in which a lubrication port is provided in a tubular portion of a swivel.

According to a fifth aspect of the present invention, there is provided a suspension hook with a greasing mechanism, in which an oil guide passage is formed in the shaft center of the swivel.

According to a sixth aspect of the present invention, there is provided a lubrication mechanism in which a discharge port for lubricating oil is formed below the shaft of the hook body, and a dust seal which is opened by the lubrication pressure is provided at the discharge port. It is a hanging hook.

According to the first aspect of the present invention, the rotating mechanism and the swinging mechanism are independently provided, the hook body can be rotated substantially horizontally by the rotating mechanism, and the hook body hangs down by the swinging mechanism. When lubricating oil is injected from a lubrication port provided in one of the rotating mechanism and the swinging mechanism in the hanging hook that can swing in the state, the lubricating oil can pass through the oil guide path to the other of the rotating mechanism and the swinging mechanism. Is also supplied to
Lubricating oil can be supplied to both the rotation mechanism and the swing mechanism in one greasing operation.

According to the second aspect of the present invention, the lubricating oil is supplied to the sliding portion of the swivel, and then the lubricating oil is sent to the swing mechanism.

According to the third aspect of the present invention, lubrication of the swing mechanism is performed by the lubricating oil supplied to the sliding portion of the pin.

According to the fourth aspect of the present invention, since the lubrication port is provided in the cylindrical portion of the swivel, the lubrication mechanism is provided with the lubrication port as in the case where the lubrication mechanism is provided at the axial center of the rotary shaft. There is no fear that the axial strength is reduced by the subsequent greasing hole.

According to the fifth aspect of the present invention, the lubricating oil is supplied to both the rotating mechanism and the sliding portion of the swinging mechanism through the oil guide path formed in the shaft center of the swivel.

According to the present invention, since the dust seal can be opened and the lubricating oil can be discharged only when the lubrication pressure is increased by performing lubrication, the dust seal functions as a valve for normally closing the dust seal. Can be done.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows a structure in which a hanging hook according to the present invention is mounted on a bucket of a hydraulic shovel.

In FIG. 1, a hydraulic shovel 1 has a cabin (operating cab) 4 on a swivel 3 supported by a lower traveling body 2.
Is mounted, and a front attachment 5 is arranged at a side position of the cabin 4. The front attachment 5 includes a boom 6 that swings up and down, an arm 7 that pushes and pulls in a front and rear direction, and a bucket 8 provided at the tip of the arm 7.

The boom 6 is driven by a boom cylinder 9, the arm 7 is driven by an arm cylinder 10, and the bucket 8 is rotated by a bucket cylinder 11.

The hydraulic excavator 1 is a so-called crane-specific hydraulic excavator that conforms to a crane structure standard, detects a boom angle, an arm angle, a boom pressure, and the like, gives them to a controller (not shown), and executes various processes. Thus, the actual load can be displayed or an overload can be warned.

A pair of brackets 8a and 8b are formed in parallel on the outer surface of the bucket 8, and pins (not shown) penetrating the rod end portion 11a of the bucket cylinder 11 are fixed by the respective brackets 8a and 8b. It is pivoted.

A pin (not shown) is provided below each of the brackets 8a and 8b, and a hanging hook 12 is suspended via the pin. This hanging hook 1
2 is lifted in the direction of arrow A and stored between the brackets 8a and 8b during excavation work and transport, and the hook fixing pin 8
It can be fixed to the cylindrical shaft-shaped hook fixing portion 8c using b.

Next, the structure of the hanging hook will be described with reference to FIG. 2 (a) is a front sectional view, FIG. 2 (b) is a right side view, and FIG. 2 (c) is a sectional view taken along line BB of FIG. 2 (a).

2 (a) and 2 (b), a hanging hook 12 includes a hook supporting portion 20 attached to brackets 8a and 8b of the bucket 8 via pins (not shown).
It mainly comprises a swivel 22 connected to the hook support portion 20 via a pin 21 serving as a horizontal axis, and a hook main body 23 suspended from the swivel 22.

The hook support portion 20 is formed of a thick plate member, and has a through hole 20a through which a pin can be inserted.
A pair of bearing portions 20 having a ring portion 20b provided with
d and 20d are formed in a gate shape.

Between the pair of bearing portions 20d, a suspension portion 22a as a shaft portion protruding from the swivel 22 on the rotating shaft can be inserted. A pin through hole 22b is formed in the suspension portion 22a to allow the pin 21 to penetrate in the lateral direction. Therefore, with the hanging portion 22a inserted between the bearing portions 20d, 20d, the pin through-hole 22b and the bearing portion 20d are inserted.
The hook support 20 and the swivel 22 are connected to each other by inserting the pin 21 into the shaft hole. Thereby, the swivel 22 can be swung in the arrow C direction with the pin 21 as the rotation axis. The pin 21 and the bearings 20d, 20d that support the pin 21 constitute a swing mechanism.

A key groove 21a is formed at the tip of the pin 21 in the insertion direction. After the pin 21 is inserted, the key 23 is engaged with the key groove 21a, and the key 23 is
4 by fixing to the hook support portion 20,
Is prevented from falling off. In the figure, 2
Reference numeral 0e denotes a grease nipple mounting hole provided in the ring portion 20b of the hook support 20.

A swivel 22 as a rotation mechanism is suspended from the hook support 20 so as to be swingable. The swivel 22 has a swivel outer cylinder 22c as a cylindrical portion, and a swivel inner cylinder 22d screwed to the swivel outer cylinder 22c.
And a bearing unit 22e fitted on the inner peripheral side of the swivel inner cylinder 22d.

The bearing unit 22e is composed of a well-known ball bearing for thrust load. A pair of bearing rings are arranged opposite to each other to hold the bearing between them. Grease is filled in the gap between the two bearing rings to reduce wear of the bearings. I'm preventing. The bearing unit 22e is housed in a step formed on the inner peripheral side of the swivel inner cylinder 22d, and the swivel inner cylinder 22d is screwed to the swivel outer cylinder 22c leaving a space in which a nut 23b described later can be arranged. Have been.

On the other hand, the hook shaft 23a of the hook body 23
Is the swivel inner cylinder 22d and the bearing unit 22
e in the vertical direction. And the hook shaft 23
The hook body 23 is connected to the swivel 22 by screwing the nut 23b into the male screw portion formed at the upper end of the hook a.

In this state, the hook shaft 23a is
It is supported by the upper bearing ring of the bearing unit 22e via 3b, and can be rotated by rolling of the bearing. That is, the hook main body 23 can rotate horizontally with the vertical axis VA as the rotation axis.

In the drawing, reference numeral 23c denotes a stopper for preventing the rope hung on the hook body 23 from coming off.

According to the hanging hook 12, the hook main body 23 can be rotated about the vertical axis VA, and can be swung about the horizontal axis HA as a fulcrum.
The hook body 23 can be returned during the suspending operation, and the posture of the hook body 23 can be made to follow the suspended load pulling direction.

Next, the greasing structure of the suspension hook 12 will be described.

The center axis of the swivel outer cylinder 22c has a diameter of 4 mm.
An oil guide passage 22f is formed.
The upper end of 2f is communicated with the gap x of the sliding portion of the pin 21,
The lower end communicates with a gap y in which the inner surface 22c 'of the swivel outer cylinder and the upper surface of the nut 23b face each other. This gap y
Communicates with a space portion 22g in the swivel outer cylinder 22c. As shown in FIG. 2 (c), the space portion 22g communicates with a lubrication port of a grease nipple 25 arranged in a substantially tangential direction of the swivel outer cylinder 22c.

The drill used for drilling the oil guide passage 22f is long since it is inserted from the outer cylinder 22c side of the swivel. Therefore, if the diameter of the oil guide passage is set to less than 3 mm, the drill may be damaged during machining, and foreign matter is easily clogged in the oil guide passage 22f.
On the other hand, if it exceeds 7 mm, the grease tends to flow toward the oil guide passage 22f, so that the grease does not easily turn toward the bearing unit 22e. Therefore, in the present embodiment, the oil guide passage 22f
Is set to 4 mm, but a preferable range of the diameter is 3 to 7 mm.

Next, the function of the hanging hook with the greasing mechanism having the above configuration will be described.

When a grease pump (not shown) is connected to the grease nipple 25 to inject grease into the swivel 22, grease previously filled in the space portion 22g is directed toward the hook shaft portion 23a and the oil guide passage 22f. Split and flow.

When lubrication is continuously performed from the grease pump,
Grease is applied to the inner peripheral surface of the swivel inner cylinder 22d and the hook shaft 23.
a flows downward through a slight gap z with the outer peripheral surface of the hook body 23 and the boundary between the hook body 23 and the hook shaft 23a (C in the figure).
Part) to the outside. At this time, hook shaft 2
Foreign matters such as dust mixed in the 3a and the bearing unit are also discharged to the outside along with the flow of grease.

FIG. 3A is an enlarged view of a portion C in FIG. In the figure, a step-shaped notch 22d 'is formed in the swivel inner cylinder 22d facing the lower part of the peripheral surface of the hook shaft portion 23a, and a dust seal 30 is mounted in the notch 22d'. The dust seal 30 includes an annular rubber seal 30a and the rubber seal 30a.
The rubber seal 30a is in close contact with the hook shaft portion 23a to prevent foreign matter from entering the hook shaft portion 23a.

Then, when the grease descends the gap z, FIG.
As shown in (b), the rubber seal 30a which is easily elastically deformed is pushed and spread in the direction E, flows in the direction of the arrow in the figure, and is discharged to the outside.

On the other hand, the grease supplied to the gap x of the rubbing portion of the pin 21 through the oil guide passage 22f is applied to the gap between the outer peripheral surface of the pin 21 and the inner surface of the through hole of the suspension portion 22a or the pin 2
1 flows through the gap between the outer peripheral surface and the inner surface of the through hole of the bearing portion 20d,
It is discharged out of the hook support 20.

Thus, grease can be supplied to both the hook shaft portion 23a and the pin 21 only by supplying grease from the grease nipple 25 provided on the swivel outer cylinder 22c.

In an attachment with a hanging hook in which the hanging hook 12 is attached to the bucket 8, the hanging hook 8
Is inevitably contaminated with dust or earth and sand. However, in the configuration of the suspension hook with the greasing mechanism of the present embodiment, the grease filling the sliding surface of the hook shaft portion 23a and the pin 21 can be replaced with new grease. Can be used.

In the above embodiment, the lubrication port is provided on the swivel side, which is a rotating mechanism. However, the present invention is not limited to this, and the lubrication port may be provided on the swing mechanism side.

[0051]

As is apparent from the above description,
According to the first aspect of the present invention, the rotation mechanism and the swing mechanism are independently provided, the hook body can be rotated substantially horizontally by the rotation mechanism, and the hook body swings in a suspended state by the swing mechanism. The lubricating oil is injected into the suspension hook that can be moved from the lubrication port provided in one of the rotation mechanism and the swing mechanism, and the lubricating oil is supplied to the other of the rotation mechanism and the swing mechanism through the oil guide path. Since lubrication oil can be sent, lubricating oil can be supplied to both the rotation mechanism and the swing mechanism in one greasing operation.

According to the second aspect of the present invention, the lubricating oil supplied to the sliding portion of the swivel can be subsequently supplied to the swing mechanism.

According to the third aspect of the present invention, lubrication of the swing mechanism is performed by the lubricating oil supplied to the sliding portion of the pin.

According to the fourth aspect of the present invention, since the lubrication port is provided in the tubular portion of the swivel, the lubrication mechanism is provided with the lubrication port as in the case of the lubrication mechanism provided at the shaft center of the rotary shaft. There is no fear that the axial strength is reduced by the subsequent greasing hole.

According to the fifth aspect of the present invention, the lubricating oil is supplied to both the rotating portion and the sliding portion of the swinging mechanism through the oil guide passage formed in the shaft center portion of the swivel.

According to the sixth aspect of the present invention, since the dust seal can be opened and the lubricating oil can be discharged only when lubrication pressure is increased by performing lubrication, the dust seal functions as a valve for normally closing the dust seal. Can be done.

As described above, according to the present invention, it is possible to discharge foreign matter mixed in the rotation mechanism and the swinging mechanism of the suspension hook to the outside with the lubricating oil simply by injecting the lubricating oil from the lubrication port. Therefore, even if the attachment is used in an environment in which earth and sand are attached or contaminated with dust, there is an advantage that troubles due to invasion of foreign matter such as dust can be eliminated and the hanging hook can be operated stably.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a hydraulic shovel to which a hanging hook according to the present invention is applied.

FIGS. 2A and 2B show a configuration of a hanging hook of the present invention, wherein FIG. 2A is a front sectional view, FIG. 2B is a right side view, and FIG.

FIG. 3 is an enlarged sectional view of a portion C in FIG. 2;

FIG. 4 is an explanatory view showing a configuration of a conventional hanging hook with a greasing mechanism, which has a partially cut-out portion.

FIG. 5 is an explanatory view showing the configuration of another conventional hanging hook.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Suspension hook 20 Hook support part 21 Pin 22 Swivel 22e Bearing unit 22f Oil guideway 23 Hook body 23b Hook shaft part 25 Grease nipple VA Vertical axis HA Horizontal axis

Continued on the front page (72) Inventor Takanori Nakatani 3-12-4 Gion, Asaminami-ku, Hiroshima City Kobelco Construction Machinery Co., Ltd. Hiroshima Head Office (72) Inventor Kawa ▼ Saki ▲ Katsuji 5-1-1 Nakamachi, Minatojima F-term in Martec Co., Ltd. (reference) 2D012 FA00 GB05 2D015 AA01 3F004 CB06 DA02 3J038 BA07 BB01

Claims (6)

[Claims] 1. A hanging hook independently provided with a rotation mechanism for rotating a hook body about a vertical axis and a swing mechanism for swinging about a horizontal axis while the hook body is suspended. A sliding mechanism in the mechanism and the oscillating mechanism is communicated with an oil guide path, and the oil guide path is further communicated with an oil inlet provided in one of the rotation mechanism and the swing mechanism. Hanging hook with greasing mechanism. 2. The rotary mechanism according to claim 1, further comprising: a cylindrical portion that rotatably supports a shaft portion of the hook body around a vertical axis; and a shaft portion protruding from the cylindrical portion on the vertical axis. The hanging hook with a greasing mechanism according to claim 1, comprising a swivel provided with the shaft-shaped portion connected to the swing mechanism. 3. A swivel mechanism having a hook support portion for attaching the hook body, wherein the swing mechanism is provided at a lower end of the hook support portion and pivotally supports the pin. The suspension hook with a greasing mechanism according to claim 2, comprising a bearing portion. 4. The hanging hook with a greasing mechanism according to claim 2, wherein the lubrication port is provided in a tubular portion of the swivel. 5. The suspension hook with a greasing mechanism according to claim 2, wherein the oil guide passage is formed in a shaft center portion of the swivel. 6. A discharge port for lubricating oil is formed below the shaft portion of the hook main body, and a dust seal which is opened by a greasing pressure is provided at the discharge port portion.
6. The hanging hook with a greasing mechanism according to any one of claims 5 to 5.