JPH10237898A - Grease feeding structure of sheave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed grease to a sliding surface, and prevent the penetration of sand to the sliding surface by providing a recessed part on the bottom part of a rope groove, mounting a grease nipple in the recessed part, and providing a grease feeding port extending from the recessed part to the inside surface of a sheave shaft fitting hole. SOLUTION: A recessed part 30 is provided on a sheave 10 central side on the bottom part of a rope groove 31 provided on the circumference of the sheave 10. A grease feeding port 32 is provided extending from the recessed part 30 to a sliding surface 33 which is the inside surface of a fitting hole 10a with a sheave shaft 14. A grease nipple 34 is mounted on the inlet of the grease feed port 32 in the recessed part 30 by screwing so as not to be protruded from the groove bottom part. An oil groove 35 communicating with the grease feed port 32 is provided over the whole circumference of the sliding surface 33. Thus, grease can be supplied to the sliding surface 33 through the grease feed port 32 by a grease gun. Thus, the labor of the disassembling and repairing by the damage of the sliding surface 33 can be saved, and a grease feeding type sheave 10 can be provided at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for lubricating a sliding surface between a sheave shaft and a shaft fitting hole of a sheave, and more particularly to a shaft portion and a sheave boss in a construction machine such as a hydraulic shovel or a crane. The present invention relates to a lubrication structure suitable for application when it is difficult to lubricate from the ground.

[0002]

2. Description of the Related Art FIG. 2 is a side view showing an example of a pile driving machine using a hydraulic excavator as a base machine.
The extension arm 3 is attached to the tip of the articulated arm 2 of the hydraulic excavator 1, and when excavating a vertical hole, the auger driving device 5 is suspended from the tip of the extension arm 3 via the pin 4, and the auger driving device 5 Rotate 6 to drill a vertical hole.

[0003] Further, in the case where a pile driving is performed after excavating a vertical hole by the auger 6, instead of the auger driving device 5,
As shown in FIG. 3, the operation is performed by attaching a chuck device 7 for gripping a pile such as an H-section steel or a sheet pile to the extension arm 3.

In order to suspend the auger 6 in the auger driving device 5 and mount the upper end to the auger driving device 5, a winch 8 is attached to the articulated arm 2, and a suspension rope 9 wound around the winch 8 is extended. In order to hang from the tip of the arm 3, a sheave 10 is attached to the tip of the extension arm 3.

The sheave 10 is driven so that the hanging position of the suspension rope 9 is constant with respect to the auger driving device 5 and the pile chuck device 7 irrespective of the inclination angle of the extension arm 3. It is set coaxially with the mounting pin 4 of the device 5.

FIG. 4 is an exploded perspective view showing a mounting structure of the sheave 10, 12 is a mounting shaft to the extension arm 3, 13 is an arm fixed vertically to one end of the mounting shaft 12, and 14 is a fitting of the sheave 10. The sheave shaft 14 is a cylindrical shaft having an inner diameter slightly larger than the head of the mounting pin 4 for inserting and removing the mounting pin 4 of the auger driving device 5. It is composed of 1
5 and 16 are the mounting shafts 1 with respect to the extension arm 3.
Bolts and nuts for fixing the arm 1
3 is provided so as to be fixed so that the center of the sheave shaft 14 coincides with the pin 4 or the like.

[0007] 18-21 are circular holes 18a-21a, respectively.
Is an arm rotatably fitted to the sheave shaft 14, and the arm 1 is attached so as to sandwich the sheave 10.
Rope holding rollers 22 are mounted between 8 and 19 and between arms 20 and 21, respectively. 24 is a washer, and 25 and 26 are stoppers for the sheave 10.

FIG. 5 shows an auger driving device 5 and a chuck device 7.
5A is a view showing a replacement step of FIG. 5A, wherein a shows a state in which the auger driving device 5 is attached to the extension arm 3. In this case, the mounting bracket 5 a of the auger driving device 5 is mounted on the extension arm 3 by the pin 4, and the sheave 10 inserts the mounting shaft 12 into the boss of the extension arm 3 and uses the bolt 15 and the nut 16. ,
The sheave shaft 14 is assembled so as to be concentric with the pin 4.

When the auger driving device 5 is detached from the extension arm 3, the auger driving device 5 is placed on a table 28 as shown in FIG.
Pull out through the sheave shaft 14. Also, for stakeout,
When attaching the chuck device 7 to the extension arm 3, as shown in FIG. 5C, the chuck device 7 is placed on a table 29, and as shown in FIG.
The extension arm 3 is fitted into the mounting bracket 7a, and the pin 30 is passed through the sheave shaft 14 and the boss of the bracket 7a and the extension arm 3 to attach the chuck device 7 to the extension arm 3.

[0010]

According to the structure of the conventional sheave 10, the sheave shaft 14 has a cylindrical shape because the sheaves 10 must be provided coaxially with the pins 4, 30 and the pins 4, 30 must be inserted and removed. Therefore, a structure in which a greasing hole is provided in the sheave shaft 14 from the end to the sliding surface of the sheave fitting hole 10a to supply grease cannot be adopted. Also,
Rope holding roller mounting arms 18 on both sides of sheave 10
To 21 are provided, the boss 10b of the sheave 10 (FIG. 4)
See)).

For this reason, the conventional sieve 10
Liquid grease is poured from between the arm and the arms 18 to 21 to lubricate the sliding surface. However, in the case of the liquid grease, in a dusty work environment, sand or dust may be applied to the sliding surface together with the liquid grease. Penetrates, which damages the sliding surface,
There is a problem that disassembly and repair take time.

In order to avoid such a problem,
If a special self-lubricating member impregnated with a lubricant is used for the surface of the sheave shaft 14 and the fitting hole 10a of the sheave 10, there is a problem that the sheave price becomes high.

In view of the above-mentioned problems, the present invention provides a method of supplying lubrication to a sliding surface between a sheave and a sheave shaft even when lubrication from a sheave shaft and a sheave boss cannot be performed. An object of the present invention is to provide a sheave lubricating structure that can lubricate, thereby preventing sand and dust from entering a sliding surface and that does not require the use of an expensive self-lubricating member.

[0014]

In order to achieve the above-mentioned object, the present invention provides a concave portion which is recessed in the center of the sheave at the bottom of the rope groove on the outer periphery of the sheave so that the concave portion does not protrude from the bottom of the rope groove. A grease nipple is attached, and a greasing hole is provided from the recess to the inner peripheral surface of the sheave shaft fitting hole.

[0015]

According to the present invention, the lubrication of the sliding surface between the sheave shaft and the fitting hole of the sheave shaft is performed from the grease nipple in the concave portion provided at the groove bottom of the sheave to the greasing hole provided inside the sheave. The lubrication is performed on the sliding surface with the sheave attached. The grease supplied in such a path may be semi-solid grease instead of liquid grease. By filling the sliding surface with semi-solid grease, sand and dust are prevented from entering the sliding surface. You.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a sectional view showing a lubrication structure for a sheave according to the present invention, and FIG. 1B is a partially enlarged view of FIG. 1A. FIG. 5 shows the structure applied to the sheave 10 attached to the tip of the extension arm 3 of the pile driver shown in FIG. 5, and the same reference numerals as those in FIGS. 2 to 5 indicate the same components.

Reference numeral 30 denotes a concave portion which is recessed toward the center of the sheave at the bottom of the rope groove 31 on the outer periphery of the sheave 10, and reference numeral 32 denotes a sliding surface which is the inner peripheral surface of the fitting hole 10a for fitting the sheave shaft 14 from the concave portion 30. It is a greasing hole provided over the surface 33. A grease nipple 34 is attached to the recess 30 by fitting or screwing into the inlet of the greasing hole 32 so as not to protrude from the groove bottom. The greasing hole 32 and the grease nipple 34 provided at the entrance of the greasing hole 32
Provided at the location. The sliding surface 33 is provided with an oil groove 35 communicating with the greasing hole 32 over the entire circumference.

As described above, if the grease nipple 34 and the greasing hole 32 are provided, it becomes possible to greasing the sliding surface 33 from the outer peripheral side of the sheave 10 through the greasing hole 32 with a grease gun. 22 Mounting arm 18 ~
21, the sheave boss 10b side and the sheave shaft 1
The problem that lubrication cannot be performed from the fourth side can be solved. When the wire rope 9 is hung around the sheave 10, the grease nipple 34 is covered by the wire rope 9 depending on the rotation position. Therefore, the sheave 10 is rotated to a position where the wire rope 9 does not cover the grease nipple 34. After avoiding the wire rope 9, the greasing work is performed. Further, as the grease supplied to the greasing hole 32, a semi-solid grease injected with a grease gun can be supplied, so that the sliding surface 33 can be filled with grease, and sand and dust can be prevented from entering the sliding surface. 33 can prevent this. Further, if the oil groove 35 is provided as in this embodiment, grease can be stored in the oil groove 35, and the lubrication of the sliding surface 33 can be maintained for a long period of time.

Further, it is not necessary to use a special self-lubricating member impregnated with a lubricant on the surface of the sheave shaft 14 or the fitting hole 10a of the sheave 10.

The present invention can be applied to a case where the sheave shaft 14 is solid, and also to a sheave in which the sheave boss 10b is not shielded by the arms 18 to 21 and the like.

[0021]

According to the present invention, since the greasing hole is provided from the groove side of the sheave to the fitting hole, the greasing from the outer peripheral side of the sheave is made possible. Even when lubrication from the shaft side is difficult, lubrication becomes possible. Therefore, the entry of sand or dust to the sliding surface can be prevented by the semi-solid grease filled in the sliding surface, and the trouble of disassembling and repairing due to damage to the sliding surface can be saved.
Further, there is no need to provide an expensive self-lubricating member on the sliding surface, and a lubricating sheave can be provided at low cost.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing one embodiment of a sheave lubrication structure according to the present invention, and FIG. 1B is a partially enlarged view of FIG.

FIG. 2 is a side view showing a conventional pile driver.

FIG. 3 is a perspective view showing a state in which a chuck device is attached to an extension arm in the pile driver of FIG. 2;

FIG. 4 is an exploded perspective view of a sheave used in the pile driver shown in FIGS. 2 and 3 and a mounting member thereof.

FIG. 5 is a view showing a process of assembling an auger driving device and a chuck device in the pile driver shown in FIGS. 2 to 4;

[Explanation of symbols]

10: sheave, 10a: fitting hole, 12: mounting shaft, 13:
Arm, 14: sheave shaft, 15: bolt, 16: nut, 18 to 21: arm, 22: rope holding roller, 2
4: washer, 25, 26: stopper, 30: recess, 3
1: rope groove, 32: greasing hole, 33: sliding surface, 34: grease nipple, 35: oil groove

Claims (1)

[Claims] 1. A concave portion recessed toward the center of the sheave is provided at the bottom of the rope groove on the outer periphery of the sheave, and a grease nipple is attached to the concave portion so as not to protrude from the bottom of the rope groove. A greasing structure for a sheave, wherein a greasing hole is provided on a peripheral surface.