JP3509466B2 - Resin washers for civil engineering machines - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin washer suitable for use in civil engineering such as shovels, construction and mining machines (these are referred to as civil engineering machines in the present invention).

[0002]

For example, in an excavator which is a civil engineering machine, a boom and an arm are axially connected to each other, whereby the arm is rotatable and rotatable with respect to the boom. And for this shaft connecting part,
Lubrication is generally performed by applying grease or the like.

This civil engineering machine or the like is generally used in a bad environment in which dust, rainwater, etc. directly adhere, and in addition, when used in an urban area, it causes a problem in terms of noise. By the way, if the lubrication of the shaft connecting part is lubrication only with grease, etc. as described above, dust and rainwater will inevitably adhere to the shaft connecting part, and the shaft connecting part will be worn and damaged early and Frequent replacement of parts is required. In addition, only with lubrication lubrication with grease or the like, it is inevitable that noise will be generated due to metal contact between the arm and the boom at the shaft connecting portion, collision, etc., and noise reduction cannot be expected so much.

Therefore, refueling is not required so much, the generation of noise can be preferably reduced, and it can be used for a relatively long period of time. Moreover, dust, rainwater, etc. can be prevented from entering the gaps of the shaft connecting portion. There has been proposed a resin-made thrust washer suitable for civil engineering machines and the like, which has advantages such as reliable prevention and reduced deterioration of a shaft connecting portion.

By the way, when the resin washer is assembled to a shaft connecting portion of a civil engineering machine or the like, it is necessary to align the shaft with the through hole of the washer in order to pass the shaft through the through hole at the center of the washer. However, if the maximum outer shape of the washer is equal to or smaller than the maximum contour of the shaft connecting portion, the worker or the work robot cannot grasp and position the washer outside the shaft connecting portion, and the shaft cannot be positioned. Positioning is performed in the extremely narrow gap of the connecting part,
It is extremely difficult to position the washer by putting the finger of the worker or the work robot in such an extremely narrow gap, and it is inevitable to do this with the help of some tool or jig, and the assembling work by one person. Becomes difficult, resulting in an increase in the number of assembling steps and a cost increase.

The present invention has been made in view of the above points, and an object thereof is to improve the assemblability to a shaft connecting portion of a civil engineering machine or the like and to reduce the number of assembling steps. It is to provide a resin-made washer for civil engineering machines, etc., which can be expected to reduce costs.

[0007]

A resin washer of the present invention is provided between two members that rotate relative to each other in a civil engineering machine or the like, and comprises an annular washer body and
The washer body is provided with a gripping portion that projects radially outward from the outer edge of the washer body and is integrally formed with the washer body.

The washer-forming resin material of the present invention, in particular,
The resin material for forming the annular washer body may be either a natural resin or a synthetic resin, and preferable examples include acetal, nylon, polyurethane and polyester elastomer which have excellent mechanical properties and have some elasticity. Of these, polyester elastomers are particularly preferred.

The overall shape of the washer body needs to be annular to allow the shaft to pass through, and the most common and most preferred annular shape is this shape, but the present invention is not necessarily limited thereto, and the elliptical shape It may have any shape as long as it is annular, and the shape of the annular inner peripheral edge and the annular outer peripheral edge of the washer body is preferably circular, but instead of this, it is corrugated in a corrugated shape, in other words Of course, it may be star-shaped. In particular, when the outer peripheral edge undulates and has an uneven shape, it is preferable in some cases because dust or the like that has intruded into the gap to which the washer of the present invention is applied can be scraped out as the arm rotates. In addition, the washer body may be one in which a plurality of holes are formed like a so-called punching metal (perforated plate). In the case of such a flat plate, the raw material used can be reduced and When a lubricating oil such as grease is used together with the washer of the present invention, the hole portion serves as a lubrication reservoir, which can exhibit preferable lubricating performance for a long period of time.

The gripping margin is formed integrally with the washer body, and in a preferred example from the viewpoint of ease of manufacturing, it is formed from the same material as the washer body with the same thickness, but from the viewpoint of ease of removal, Only the portion is thinner than the washer body, and may be made of a different material. The grip allowance may be a substantially rectangular shape (square or rectangular) in its planar shape, but may be a semicircular shape or a semielliptical shape, and a shape that can be easily grasped by protruding from the washer body. Any of them can be used, and in addition, it does not have to be formed on the same plane as the washer body, and a plane extending in a direction different from the plane of the washer body so that it can be easily gripped and held during alignment. May be curved and bent from the outer edge of the washer main body so as to extend outward, and the inside of the washer body may be removed leaving a peripheral edge, for example, a semi-annular shape. Good. Further, in order to prevent slippage due to water, grease, lubricating oil, rust preventive oil, etc. during positioning by gripping this, many small irregularities may be provided on the surface, preferably both surfaces, to form a grip margin. . Although only one gripping margin is required, a plurality of gripping margins may be provided around the outer edge of the washer body, preferably, a plurality of gripping margins may be provided at equal intervals so that alignment can be performed from any direction or position.

In the washer of the present invention, a groove is formed at the boundary between the washer body and the grip allowance to facilitate removal of the grip allowance from the washer body. This groove is formed on at least one of the two surfaces facing the two members that rotate relative to each other, in the preferred example, both surfaces, and the shape of the groove is a cross section in a direction orthogonal to the extending direction. Preferably has a V-shape, but instead of this, the cross-section may have a U-shape or a semi-circular shape. Furthermore, the groove is
It may extend in a straight line, but if it is substantially continuous with the outer peripheral edge of the washer body, for example, if the outer peripheral edge of the washer body is circular, it has the same radius of curvature as that of the outer peripheral edge. It preferably extends in an arc shape. Further, in order to easily remove the grip allowance from the washer body, a so-called perforation may be formed at the boundary between the washer body and the grip allowance instead of or together with the groove. If at least one of the groove and the perforation is formed, the grip allowance can be removed from the washer main body after assembly, and a good-looking washer and shaft connecting portion can be obtained, which is extremely preferable.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention and the embodiments of the present invention will be described in more detail based on the preferred embodiments shown in the drawings. The present invention is not limited to these examples.

[0013]

EXAMPLE In FIG. 1, a resin washer 1 of this example is used.
The washer body 2 has an annular shape, and a grip margin 4 that is formed integrally with the washer body 2 and projects radially outward from the outer edge 3 of the washer body 2.

In the present embodiment, the entire washer 1 is integrally formed of a polyester elastomer which is a resin material, but instead of this, it is integrally formed of acetal, nylon or polyurethane or another appropriate resin material. It may have been done. The entire thickness of the washer 1 is appropriately selected so as to be placed in the gap of the shaft connecting portion to be applied so as to exert an optimum thrust bearing function.

The washer body 2 has a circular outer edge 3 and a circular inner edge 5, and a shaft 18 described later is inserted into a through hole 6 defined by the inner edge 5.

In this example, the gripping margin 4 is formed in a rectangular shape in a substantially planar shape, and extends in the same plane as the plane of the washer body 2.

As shown in FIGS. 2 and 3, grooves 7 and 8 for facilitating removal of the gripping allowance 4 from the washer body 2 are formed at the boundary between the washer body 2 and the gripping allowance 4. Good. In the example shown in FIGS. 2 and 3, the groove 7 is a surface 9 of the washer 1 that faces two members that rotate relative to each other, which will be described later.
In addition, the groove 8 is provided with the washer 1 facing the two members that rotate relative to each other.
Formed on the other surface 10 of each of the grooves 7 and 8
Each has a V-shaped cross section in a direction orthogonal to the extending direction.

The washer 1 thus constructed and provided with the grooves 7 and 8 shown in FIGS. 2 and 3 is pivoted to an upper revolving structure (not shown) as shown in FIGS. 4 and 5, for example. A boom that is two members that rotate relative to each other in a shovel 14 that includes a boom 11 that is freely attached, an arm 12 that is rotatably attached to the boom 11, and a bucket 13 that is also rotatably attached to the arm 12. The gaps 16 and 17 of the shaft connecting portion 15 between the arm 11 and the arm 12.
Applied to.

In the shaft connecting portion 15, the gaps 16 and 17 are formed.
Generally has a width of 1 mm to 2 mm, and a lubricating oil such as grease is applied to the radial bearing 19. However, if only grease is used, dust, rainwater, and the like will come from here to the radial bearing 19 composed of the shaft 18 and the iron bush. To accelerate the deterioration of the shaft 18 and the bearing 19, and the boom 11 and the arm 12 easily contact and collide with each other in the gaps 16 and 17,
This causes wear and even noise. However,
When the washer 1 is installed in the gaps 16 and 17, the boom 1
Direct contact and collision between the arm 1 and the arm 12 can be avoided, so that the deterioration of the shaft connecting portion 15 can be reduced and the generation of noise can be significantly reduced. In addition, 20 is an oil seal, 21 is
It is a hydraulic cylinder.

Moreover, in the washer 1, as shown in FIG. 5, since the gripping margin 4 projects outward from the maximum contour of the shaft connecting portion 15, the shaft connecting portion is inserted when the shaft 18 is inserted into the through hole 6. An operator or a working robot grips the gripping margin 4 outside the portion 15 and moves the washer main body 2 to move the shaft 18 and the through hole 6
Can be easily positioned, and the shaft 1 in the extremely narrow gaps 16 and 17 of the shaft connecting portion 15 can be positioned.
8 and the through hole 6 can be aligned very easily without the aid of a tool or a jig, and the assembling work can be performed by one person, and the assembling man-hour and the cost can be reduced.

In addition, a washer 1 having grooves 7 and 8
Then, after the shaft connecting portion 15 is assembled, the grip margin 4 protruding from the maximum contour of the shaft connecting portion 15 is easily removed from the washer body 2 along the grooves 7 and 8 without using a cutting tool or the like. It is possible to obtain a shaft connecting portion that has a very good appearance after removal.

In the above washer 1, the groove 7 extending in a straight line is formed.
6 and 7, instead of this, as shown in FIGS. 6 and 7, vertical walls 31 and 32 extending in an arc shape having a radius of curvature substantially the same as the outer edge 3 of the washer body 2 were formed. Grooves 7 and 8 may be formed, which makes the outer edge 3 of the washer body 2 a substantially continuous circular shape after removal of the gripping margin 4, which makes it even more attractive.

[0023]

As described above, according to the present invention, it is possible to improve the assemblability to a shaft connecting portion of a civil engineering machine or the like, it is possible to reduce the number of assembling steps, and it is possible to expect a cost reduction. In the above, a washer and a shaft connecting portion having a good appearance can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a preferred embodiment of the present invention.

FIG. 2 is a plan view of a part of another preferred embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an explanatory view of a shovel to which the washer of the present invention can be applied.

5 is a detailed view of a shaft connecting portion of the shovel shown in FIG.

FIG. 6 is a plan view of a part of still another preferred embodiment of the present invention.

7 is a cross section taken along line VII-VII shown in FIG.

[Explanation of symbols]

1 washer 2 washer body 3 outer edge 4 Gripping allowance

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Claims (3)

(57) [Claims] 1. A washer made of resin for disposing in a gap between two members that rotate relative to each other in a civil engineering machine or the like, the annular washer main body, and a radial outside from an outer edge of the washer main body, The washer body is integrally formed with a grip allowance, and at least the washer
Body is acetal, nylon, polyurethane and poly
Made of either stell elastomer
The washer body has multiple holes that serve as a lubricant reservoir.
The washer is located at the boundary between the washer body and the gripping allowance.
A groove is formed to make it easier to remove the grip margin from the main body
The groove is one of the two surfaces facing the two members that rotate relative to each other.
A washer formed on at least one surface of the . 2. A groove, the washer according to claim 1, the cross section in a direction perpendicular to the extending direction has a V-shape. Wherein at least the washer body is a washer according to claim 1 or 2 consisting of a polyester elastomer.