JP2002047681A - Greasing device for sliding arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a greasing device for a sliding arm facilitating the grease feeding work and capable of effectively utilizing grease. SOLUTION: A concentrated grease feeding port 30 is provided at the tip section of an inside arm 3 expandably inserted into an outside arm 2. A plurality of through-holes 20a, 21a and 22a penetrating from the inner face to the outer peripheral face are provided near the sliding section on the outer peripheral face of the inside arm 3, and grease pipes 23, 24 and 25 connecting the through- holes 20a, 21a and 22a and the concentrated grease feeding port 30 are laid via the inside of the inside arm 3. The through-holes 20a, 21a and 22a are provided near the front of sliding pads 4, 5 and 6 on the outer peripheral face of the inside arm 3, and grease sumps 10, 11 and 12 storing the grease fed from the concentrated grease feeding port 30 are provided on the outer peripheral face of the inside arm 3 around the through-holes 20a, 21a and 22a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a greasing device for supplying grease for lubricating a sliding portion of a telescopically mounted sliding arm or boom used for a crane, a hydraulic shovel or the like.

[0002]

2. Description of the Related Art Conventionally, there are various grease lubrication methods for a sliding portion of a sliding arm or a boom assembled in a telescope type.
No. 7693 has disclosed.

FIG. 6 is a side sectional view of a greasing device for a multi-stage telescopic boom disclosed in Japanese Utility Model Laid-Open Publication No. Sho 62-17693, showing the base end of the boom in a state where the boom is at its minimum. FIG. 6 shows the case of a four-stage telescopic boom, in which a boom cylinder 51 is placed in the outermost boom cylinder 50, a boom cylinder 52 is placed in the boom cylinder 51, and a boom cylinder 53 is placed in the boom cylinder 52. It is configured by being inserted into. Above the base ends of the boom cylinders 51, 52, 53 except the outermost boom cylinder 50,
Each slide plate (corresponding to the slide pad of the present application) is slidably in contact with the inner surface of the adjacent outer boom.
Hereinafter, these pads will be referred to as sliding pads. The outermost boom cylinder 50 located above the sliding pads 54, 55, 56 is provided with a small-diameter through hole, and the greasing nipples 60, 61, 62 are provided in this through hole.
These grease nipples 60, 61, 62 are greased with a grease gun or the like. The boom cylinder 51 is provided with a greasing hole 63 located above the sliding pad 55, and the boom cylinder 51 around the greasing hole 63 is provided with an oil grease 66 opened upward. A greasing hole 64 is formed in the boom cylinder 52 above the sliding pad 56 so that the greasing hole 6 is formed.
An oil reservoir 67 opened upward is provided in a boom cylinder 52 around
Is provided. The boom cylinder 51 has a grease reservoir 67.
A greasing hole 65 is formed in the upper part of the boiler cylinder 51 around the greasing hole 65.
8 are provided.

[0004] When lubricating in the above configuration, each of the boom cylinders 51, 52, 53 is kept in the minimum contracted state. The grease supplied to the greasing nipple 60 is supplied to the sliding pad 54. The grease supplied to the greasing nipple 61 first enters the grease reservoir 66 and is supplied to the sliding pad 55 through the greasing hole 63. The grease supplied to the greasing nipple 62 first enters the grease reservoir 68, then enters the next grease reservoir 67 through the greasing hole 65, passes through the greasing hole 64, and slides through the sliding pad 56.
Is lubricated.

[0005]

However, in the lubricating apparatus disclosed in Japanese Utility Model Laid-Open Publication No. Sho 62-17693, each of the lubricating nipples 60, 61, and 62 is configured such that each of the lubricating greases is in a state where the boom is at its minimum contraction state. 66, 67, 68 and the sliding pads 54, 55, 56, so that when lubricating, the boom cylinders 51, 52, 53
Is required to be in the minimum contraction state, so that preparation work for lubrication takes time and the workability is not good. Also, when the grease is supplied in a state where the positions of the boom cylinders 51, 52, 53 are shifted, the grease is not supplied to the unnecessary portions, and the grease is not supplied to the unnecessary portions. There is a problem that is. Further, if the boom cylinders 51, 52, 53 are extended after greasing in the boom minimum contraction state, the grease in the oil reservoirs 66, 67 drops to unnecessary places in the boom cylinders, so that grease is wasted. There's a problem. Further, since the grease reservoir is not provided on the sliding pad 54 located on the most proximal end side, it is necessary to shorten the grease lubrication interval as compared with the others.

The present invention focuses on the above problems, and can supply grease regardless of the position of the boom or the arm when it is extended or contracted. It is an object of the present invention to provide a sliding arm lubrication device capable of extending a time interval.

[0007]

In order to achieve the above object, a first invention of a sliding arm greasing apparatus according to the present invention comprises a plurality of cylindrical arms sequentially arranged in a telescopic manner. In a sliding arm greasing device for supplying lubricating grease to a sliding portion of a sliding arm which is inserted and retracted, a centralized greasing port including a plurality of grease fittings is provided at a tip of an inner arm. In addition, a plurality of through-holes penetrating from the inner surface to the outer peripheral surface are provided in the vicinity of the sliding portion of the outer peripheral surface of the inner arm, and a grease pipe connecting the through hole and the centralized greasing port passes through the inner side of the inner arm. And laid.

According to the first aspect of the present invention, the centralized greasing port is provided at a predetermined location on the inner arm so that greasing can be performed at one location, so that the operator does not need to move during greasing. And, since the sliding portion of the outer peripheral surface of the inner arm which needs lubrication and the centralized greasing port are connected by a grease pipe, lubricating the sliding portion at any extending / contracting position regardless of the extending / contracting position of the sliding arm. can do. Therefore, there is no need to perform a preparation operation for bringing the arm into the contracted state at the time of lubrication, and the lubrication operation can be performed easily and in a short time.

A second invention is based on the first invention, wherein the through-hole is provided in front of a plurality of sliding pads disposed at predetermined positions on the outer peripheral surface of a base end portion of the inner arm. A grease reservoir for storing grease to be supplied from the centralized greasing port is provided on the outer peripheral surface of the inner arm around the hole to lubricate the sliding pad.

According to the second aspect of the present invention, the grease reservoir is provided in front of the sliding pad, so that even if the sliding arm expands and contracts, grease is supplied only to a necessary portion (here, the sliding pad). Can be greasy. In addition, since the grease reservoir is less likely to leak grease to unnecessary portions, wasteful consumption of grease can be prevented, which is economical, and the lubrication time interval can be extended.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sliding arm greasing apparatus according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side sectional view showing an example of a sliding arm 1 provided with a greasing device of the present invention, and FIG.
FIG. In FIGS. 1 and 2, an inner arm 3 having a similar cross-sectional shape and having a work machine 8 such as a bucket at the front end is elastically inserted into the outer arm 2 having a triangular cross-sectional shape. Sliding pads 4, 5, and 6 are attached to the outer peripheral surface of the proximal end of the inner arm 3 at the upper end and the lower left and right distal ends, respectively. To form a sliding surface.
Grease reservoirs 10, 11, and 12 which surround a predetermined area adjacent to the front of the sliding pads 4, 5, and 6 and are opened outward.
Are provided respectively. Grease reservoir 10, 11, 1
2, the outer circumferential lengths C1, C2, C3
The length is set to be longer than the outer peripheral lengths D1, D2, and D3 of Nos. 5 and 6. At the approximate center of the grease reservoirs 10, 11, and 12, through holes 20a, 21a, and 22a having a small diameter penetrating the outer peripheral surface of the inner arm 3 from the inside to the outside are respectively formed. Nipples 20, 21, and 22 are attached to the inside of the inner arm 3 at 21a and 22a, respectively. The outer arm 2 and the inner arm 3 are connected by a telescopic cylinder 7, and the slidable arm 1 expands and contracts by expanding and contracting the telescopic cylinder 7.

FIG. 3 is a front view of the inner arm 3 as viewed from the work machine 8 side, as viewed in the direction Z in FIG. In FIGS. 1 and 3, grease fittings 31, 32, and 33 are attached to the upper portion of the front surface of the inner arm 3 to form a centralized greasing port 30. 1, 2, and 3, the grease fittings 31, 32, 33 of the centralized greasing port 30 and the grease reservoirs 10, 11, 12 are connected to the grease pipes 23, 24,
25 and grease pipes 23, 2
Reference numerals 4 and 25 are provided along the inner surface of the inner arm 3.

FIG. 4 is a perspective view of the proximal end of the inner arm 3. As shown in FIGS. 2 and 4, grease reservoirs 10, 11,
Sponges 13, 14, 15 are respectively inserted into 12, and the sponges 13, 14, 15 are provided with holes 16, 17, 18 respectively at substantially central portions.

FIG. 5 is a detailed view of a portion P in FIG. When lubricating the sliding surface of the sliding arm 1, the grease fittings 31, 32, 33 may be provided at any telescopic position of the arm.
Grease with a grease gun. The lubricated grease is supplied to grease reservoirs 10, 11, and 12 via grease pipes 23, 24, and 25, respectively. Then, as shown in FIG. 5, the grease G enters the hole 16 of the sponge 13 and between the sponge 13 and the outer arm 2, depresses the sponge 13 and is stored in the grease reservoir 10. When the inner boom 3 slides, the grease G in the grease reservoir 10 is applied to the inner surface of the outer boom 2 by the above-described width C1 to lubricate the sliding surface of the sliding pad 4. The grease stored in the grease reservoir 10 is constantly pressed against the sliding surface by the sponge 13. The other two sliding pads 5 and 6 are similarly lubricated.

According to the sliding arm greasing device according to the present embodiment, grease is supplied from the grease fittings 31, 32, 33 collected in the centralized greasing port 30 to pass through the grease pipes 23, 24, 25. Each grease reservoir 1
Since the oil is supplied into the inside of the sliding arm 1, 11, and 12, it is possible to supply oil at an arbitrary extending / contracting position of the slide arm 1, and it is not necessary to bring the arm into the contracted state every time the oil is supplied. Since the worker does not need to move to the first place, the greasing work becomes very easy and the greasing can be performed in a short time.

The grease in the grease reservoirs 10, 11, and 12 lubricates only necessary portions, so that the consumption of grease can be reduced. Further, since the grease reservoirs 10, 11, and 12 are provided for the respective sliding pads 4, 5, and 6, the lubrication time intervals of all the sliding pads 4, 5, and 6 can be lengthened. Further, the grease in the grease reservoirs 10, 11, 12 is constantly pressed against the sliding surface by the sponges 13, 14, 15, so that the sliding surface can be surely lubricated even if the amount of stored grease is small, and the lubricating effect is improved. The lubrication time interval can be extended by maintaining for a long time.

Since the outer circumferential lengths C1, C2, C3 of the grease reservoirs 10, 11, 12 are set longer than the outer circumferential lengths D1, D2, D3 of the sliding pads 4, 5, 6, the sponge 13, Lubrication by the sliding pads 14 and 15
6, the sliding pads 4, 5, and 6 have less uneven wear and can have a longer life. Furthermore, grease reservoir 10,1
Grease pipe 2 connecting 1, 1 and centralized greasing port 30
Since 3, 24 and 25 are laid along the inner surface of the inner arm 3, there is no fear that the piping is damaged, and the durability is good.

In the above embodiment, the working machine arm of the hydraulic shovel has been described as an example. However, the present invention may be applied to a sliding arm, a boom, or the like of another machine. Further, although the cross-sectional shape of the elastic member has been described as an example of a substantially triangular shape, the same effect can be obtained with another cross-sectional shape such as a rectangle.

As described above, according to the present invention, the sliding part on the outer peripheral surface of the inner arm of the sliding arm is connected to the grease centralized greasing port provided at the tip of the arm by the grease pipe, and the centralized lubricating is performed. Since the greasing is performed through the mouth, the greasing can be performed at any time regardless of the extension and contraction position of the arm, and since the worker does not need to move the greasing port, the workability during greasing can be significantly improved. . Also, since the grease reservoir for storing the grease that has been greased is provided on the outer peripheral surface of the same inner arm as the sliding portion, close to the sliding portion that requires lubrication,
Grease is applied only to necessary places, and grease in the grease reservoir does not leak unnecessarily even if the arm expands and contracts, so that the greasing time interval can be extended. Further, since only the necessary portions are reliably lubricated, the amount of grease consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a slide arm having a greasing device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view of an inner arm, as viewed in the direction Z in FIG. 1;

FIG. 4 is a perspective view of a proximal end portion of an inner arm.

FIG. 5 is a detailed view of a portion P in FIG. 1;

FIG. 6 is a side sectional view of a conventional multi-stage telescopic boom greasing apparatus.

[Explanation of symbols]

1: sliding arm, 2: outer arm, 3: inner arm, 4, 5, 6: sliding pad, 10, 11, 12: grease reservoir, 13, 14, 15: sponge, 16, 17, 1
8: hole, 20, 21, 22: nipple, 20a, 21
a, 22a: through hole, 23, 24, 25: grease piping, 30: centralized greasing port, 31, 32, 33: grease fitting.

Continued on the front page (72) Inventor Hisashi Kawashima 1-3 Kushimachi Industrial Park, Komatsu City, Ishikawa Prefecture F-term in Muroto Iron Works, Ltd. (Reference) 2D012 EA00 2D015 BA01 3F205 AA05 CA03 CB01 CB14 CB18 KA02

Claims (2)

[Claims] 1. A sliding arm lubrication device for supplying lubricating grease to a sliding portion of a sliding arm in which a plurality of cylindrical arms are sequentially telescopically extended and retractably inserted, wherein an inner arm ( Provide a centralized greasing port (30) consisting of a plurality of grease fittings (31, 32, 33) at the tip of (3), and from the inner surface to the outer surface near the sliding part on the outer surface of the inner arm (3). Provide a plurality of through holes (20a, 21a, 22a) to penetrate,
A grease pipe (23, 24, 25) connecting the through hole (20a, 21a, 22a) and the centralized greasing port (30) is laid via the inside of the inner arm (3). Sliding arm lubrication device. 2. The lubricating device for a sliding arm according to claim 1, wherein said through-holes (20a, 21a, 22a) are arranged at predetermined positions on an outer peripheral surface of a base end portion of said inner arm (3). Multiple sliding pads (4,
Grease reservoir that is provided near the front of the grease reservoir (5, 6) and stores grease to be supplied from the centralized greasing port (30) on the outer peripheral surface of the inner arm (3) around the through holes (20a, 21a, 22a). (10,11,12) to lubricate the sliding pads (4,5,6).