JPH086121Y2 - Construction machine arm structure - Google Patents

Description

[Detailed Description of the Invention] Industrial Applicability [Technical Field] The present invention mainly relates to an arm structure mounted on a work attachment of a construction machine such as a hydraulic excavator.

2. Description of the Related Art FIG. 8 is a side view of a main part of a work attachment 1 for a hydraulic excavator (not shown). In the figure, 2 is an arm of the work attachment 1, 3 is a bucket, 4 is a bucket link, 5 is an idler link, 6 is a bucket cylinder, 7 is a bucket attachment portion at the tip of the arm, and 8 is a pin coupling portion at the tip of the bucket link. Is. FIG. 9 is a sectional view of the bucket mounting portion 7 as seen from AA in FIG. In the figure, 9 is a boss at the tip of the arm 2, 10 and 10 are side holes on the left and right of the boss 9, 11 and 11 are bushes with ribs respectively, 12 is a pin, 13 is a bracket for the bucket 3, and D is a pin for the pin 12. The diameter, S is the outer width dimension of the boss 9, t is the thickness dimension of the collar 14 of the bush with collar 11, and S is the outer width dimension of the arm tip (same as the inner width dimension of the bracket 13). FIG. 10 is a cross-sectional view of the pin joint portion 8 as seen from BB in FIG. In the figure, 15 is a boss at the tip of the bucket link 4, 16 and 16 are bosses 1.
5 Left and right side holes, 11 'and 11' are rib bushes,
17 is a pin, 13 'is a bracket for the bucket 3, D is a pin 17
Pin diameter, S is the outer width of 15, t is the bush with collar 11 '
The thickness dimension of the collar 14 ', S is the outer width dimension of the bucket link tip (same as the inner width dimension of the bracket 13').

A conventional arm structure will be described with reference to FIGS. Bushings 11 and 11 with flanges are fitted into the side holes 10 and 10 on the left and right of the boss 9 at the tip of the arm 2, and the bucket 3 is rotatably connected to the boss 9 via pins 12.

In the hydraulic excavator, the bucket 3 attached to the backhoe type may be inverted and replaced (not shown) depending on the type of work, the situation, etc., and used for the loader type. Therefore, the pin diameters (D) of the pins 12 and 17 in the bucket mounting portion 7 and the pin coupling portion 8 are equalized, and the outer width dimensions (S) of the arm 2 tip portion and the bucket link 4 tip portion are equalized. ing. Further, reference numeral a in FIG. 9 and reference numeral a ′ in FIG. 10 are bolt holes for locking the pins 12 and 17, respectively.

Problems to be solved by the invention Buckets to be mounted on hydraulic excavators are manufactured by manufacturers so that the size of each part of the bucket is determined by each manufacturer. The size and pin diameter of the bucket mounting part are mixed. As a result, it was not possible to replace (shared) the buckets of other manufacturers with the hydraulic excavator having the conventional arm structure. As a result, the work of the hydraulic excavator may be hindered.

Also in the case of hydraulic excavators manufactured by the same manufacturer,
If the outer width of the arm tip and the pin diameter of the bucket attachment part are changed when there is a model change, the compatibility between the old and new buckets will be lost.

An object of the present invention is to solve the above-mentioned problems and to provide an arm structure capable of mounting a bucket of another model in which the inner width of the bracket of the bucket and the pin diameter are different.

Means for Solving the Problems Means of the present invention taken to solve the above problems are (1) a. Make the outer width of the tip boss of each arm and bucket link smaller than the outer width of the smallest model in the bucket mounting section. Also, make the pin diameter larger than the maximum pin diameter of the pins in the bucket mounting part, and For the bush with flange, make the outer diameter of its cylindrical portion equal to the inner diameter of the boss side hole, and d. Set the thickness of the brim to the maximum in the bucket mounting part so that the sum of the thickness of the left and right collars and the outer width of the arm tip boss is equal to the inner width of the opposing bucket bracket. In order to correspond to the outer width of the small model, the inner diameter of the bush with bush is made up of the one with the largest diameter among the pins of the bucket mounting part. .

(2) b. In the arm structure of a construction machine according to claim 1 of the utility model registration claim, The bush with flanges fitted into the left and right side holes of the boss at the tip of the arm is provided with a rotation stopping means.

(3) B. In the arm structure of a construction machine according to claim 1 of the utility model registration claim, The bucket link and idler link provided to the arm tip and the bucket were changed in length and replaced.

Action (1) a. Since the outer width of the tip boss of each arm and bucket link has been made smaller than the outer width of the smallest model in the bucket mounting part, the thickness of the brim of the bush with brim is set to multiple types of large sizes. It is possible to mount small models one by one from the largest model in the model bucket mounting section.

B. Since the pin diameter is larger than the maximum pin diameter of the bucket mounting part, it is possible to set the inner diameter of the bush with flanges to multiple types of small diameters, and to mount smaller pin diameters sequentially from the maximum pin diameter. it can.

C. Since the outer diameter of the cylindrical portion of the bush with a collar is equal to the inner diameter of the boss side hole, select a suitable required bush with a collar from among the plurality of types of the bush with a collar in the above item a and b. Replace the boss at the tip of the arm. This allows other model buckets to be attached.

(2) b. In the arm structure of the construction machine according to claim 1 of the utility model registration, since the bush with ribs fitted into the side holes on the left and right of the boss of the arm tip is provided with the rotation preventing means, the work attachment. It is possible to prevent a problem such as the seizure or the like because the bush with the collar is rotated with respect to the boss during the operation of.

(3) B. When a bucket of another company is attached, the length of one or both of the bucket link and idler link is changed so that the arm can be prevented from interfering with other models.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the case of a hydraulic excavator, since the bucket is inverted and replaced between the backhoe type and the loader type, the arm tip portion and the bucket link tip portion are interchangeable with respect to the bucket bracket. Therefore, although the structure of the arm tip portion will be described in the embodiment, the same applies to the bucket link tip portion. FIG. 1 is a side view of the essential parts of a hydraulic excavator having an arm 18 according to the first aspect of the present invention. In the figure, 19 is a work attachment, 20 is a bucket, 21 is a bucket link, 22 is an idler link, 23 is a bucket cylinder, 24 is a bucket attachment portion at the arm tip portion, and 25 is a pin coupling portion at the bucket link tip portion. FIG. 2 is a sectional view of the bucket mounting portion 24.
In the figure, 26 is a boss at the tip of the arm 18, 27 and 27 are bosses 2.
6 Left and right side holes, 28 and 28 are bushes with brims, 29 is a pin, 30 is a bracket for the bucket 20, D ₀ is the pin diameter of the pin 29, S ₀ is the outer width of the boss 26, and t _{0 is the} brim. Thickness of collar 31 of bush 28 with bush, S ₀ is outer width of arm tip (same as inner width of bracket 30), U ₀ is inner diameter of side hole 27 of boss 26 (bush 28 with collar 28) The same as the outer diameter of the cylindrical portion 32). FIG. 3 is a cross-sectional view showing a state in which the other model bucket 33 is reattached to the tip of the arm 18. 34 is a bracket of the bucket 33, 35 is a pin, 36 is a bush with a collar, 32 'is a cylindrical portion of the bush with a collar 36, 37 is a collar, D ₁ is a pin diameter of the pin 35, and t _{1 is} a thickness dimension of the collar 37. , S ₁ is the outer width dimension of the arm tip portion (same as the inner width dimension of the bracket 34).

Next, the structure of the arm 18 according to the first aspect of the present invention will be described with reference to FIGS. The outer width dimension S ₀ of the boss 26 at the tip of the arm 18 is made smaller than the outer width dimension of the smallest model in the bucket mounting portion, and the diameter D _{0 of the} pin 29 is made larger than the largest pin of the bucket mounting portion pins. The outer diameter of the cylindrical portion 32 of the bush 28 with the flange is the inner diameter U _{0 of the} side hole 27 of the boss 26.
Equal to. At the same time, the thickness of the collar is set in the bucket mounting part so that the dimension of the thickness of the left and right collars and the outer dimension S ₀ of the boss 26 is equal to the inner width of the opposing bucket bracket. From the largest model in order to the outer width of the smaller model, the inner diameter of the bush with a shroud has multiple types of bushes that sequentially correspond to the smaller models from the largest diameter of the pins in the bucket mounting part. Configured.

Next, the function and function of the arm 18 structure according to the first aspect of the present invention will be described. Since the outer width dimension S ₀ of the boss 26 at the tip of the arm 18 is made smaller than the outer width dimension of the smallest model in the bucket mounting part, the thickness of the collar of the bush with collar is set to multiple types, It is possible to mount small models one by one from the largest model in the model bucket mounting section. In addition, since the diameter D _{0 of the} pin 29 is made larger than the maximum pin diameter of the pins of the bucket mounting part, the inner diameter of the bush with a collar is set to multiple small diameters, and it is possible to mount it from the largest pin diameter can do. The outer diameter of the cylindrical portion 32 of the bush 28 with the collar is equal to the side hole 27 of the boss 26.
Since the inner diameter U ₀ is made equal to the inner diameter U ₀ of the above, a required matching ribbed bush is selected from the plurality of types of ribbed bushes, and the boss 26 at the tip of the arm 18 is replaced. As a result, for example, as shown in FIG. 3, the bush 36 with the collar (the inner diameter of the bush 36 with the collar 36 is D ₁ , the thickness of the collar 37 is t ₁ ) is inserted into the boss 26, and the bucket 33 of another model is attached. You can In this case, the pin 35 having the outer diameter D ₁ is used (the pin 29 cannot be used).

Next, FIG. 4 is a fragmentary cross-sectional view of an arm 18 _A as in claim 2, wherein according to this invention. In the figure, 38 is an arm 18 _A
The tip boss of 39, 39 is a spline hole formed in the side hole of the boss 38 (may be a key hole), 40 is a bush with a collar, 41 is a spline formed in the cylindrical portion of the bush 40 with a collar (may be a key), D _{0 is} the inner diameter of the bush 40 with a collar, t _{0 is} the thickness dimension of the collar 42, S ₀ is the outer width dimension of the boss 38, and S ₀ is the outer width dimension of the tip of the arm 18 _A. FIG. 5 is a sectional view taken along the line CC of FIG. For this arm 18 _A , the boss 3
As an anti-rotation means for 8, the involute spline 41 of the bush 40 with a collar is fitted into the involute spline hole 39 of the boss 38. To attach a bucket of another model to the tip of this arm 18 _A , do not change the involute spline specifications of the bush with a collar, but use a bush with a collar that matches the thickness of the inner diameter and the collar. There is. As a result, it is possible to cope with other types of buckets like the structure of the arm 18 in claim 1, and to prevent the problem that the bush with flange is rotated with respect to the boss during operation of the work attachment and seized. it can.

Next, FIG. 6 is a sectional view of an essential part of another embodiment arm 18 _B of claim 2 according to the present invention. In the figure, 43 is a boss at the tip of the arm 18 _B , 44 is a stop pin hole formed in the boss 43, 45 is a bush with a flange, 46 is a stop pin hole formed in a bush with a flange 45, and 47 is a stop pin ( It may be an elastic pin or the like). FIG. 7 is a side view seen from E in FIG. At the tip of the arm 18 _{B, a} retaining pin 47 for integrally retaining both of the above is provided as a rotation preventing means for the bush 45 with a collar against the boss 43. This arm 18 _B
The working function of the structure is similar to that of the arm 18 _A structure.

Next, the arm structure according to the third aspect of the present invention will be described with reference to FIG. Arm 18 tip and bucket
The bucket link 21 and the idler link 22 arranged with respect to 20 are configured to be replaced by changing the lengths X and Y respectively.

Next, the function and function of the arm structure according to the third aspect of the present invention will be described. When a bucket (not shown) of another model is attached to the tip of the work attachment 19, the bucket rotation angle may change depending on the stroke of the bucket cylinder 23.
May interfere with each other or cause spillage of the bucket. To that end, Bucket Link 21
The length X and the length Y of the idler link 22 can be changed by changing one or both of the dimensions, and other bucket links or idler links can be used. Thereby,
It is possible to prevent the occurrence of troubles such as the above interference and spillage.

Effect of the Invention In the arm structure according to the present invention, the outer width dimension of the tip boss of each of the arm and the bucket link is made smaller than the outer width dimension of the smallest model in the bucket mounting portion, and the pin diameter in the above is set to the bucket mounting portion. The maximum pin diameter is larger than the maximum pin diameter, and the outside diameter of the cylindrical bush with collar is made equal to the inside diameter of the boss side hole. At the same time, the thickness of the collar is made to correspond to the outer width of the smaller model in order from the largest model in the bucket mounting part, and the inner diameter of the bush with a tsuba is sequentially smaller from the pin with the largest diameter in the bucket mounting part. It is equipped with multiple types of bushes with brims that can be used for. Thus, when mounting a bucket of another model, it is possible to select a suitable matching bush with ribs from among a plurality of types of bushes with ribs and replace the boss at the tip of the arm.

Further, since the locking bush is provided for the bush with flanges fitted in the left and right side holes of the boss at the tip of the arm, the bush with flange rotates relative to the boss during operation of the work attachment, It is possible to prevent burning and rubbing.

Also, when you install a bucket of another company,
By changing the length of one or both of the idler links to accommodate them, it is possible to prevent problems such as arm interference with other models.

Therefore, in the construction machine provided with the arm structure according to the present invention, the buckets of other models in which the sizes of the respective parts of the bucket are different can be mounted without any trouble, and the workability of the construction machine is improved.

[Brief description of drawings]

1 is a side view of a main part of a hydraulic excavator having an arm according to claim 1 of the present invention, FIG. 2 is a sectional view of a bucket mounting portion of the present invention, and FIG. 3 is an arm tip portion of the present invention. Sectional view showing a state where another model bucket is attached to the
FIG. 5 is a sectional view of an essential part of an arm according to claim 2 of the present invention, FIG. 5 is a sectional view taken along line CC of FIG. 4, and FIG. 6 is another embodiment of claim 2 according to the present invention. A sectional view of the main part of the arm,
FIG. 7 is a side view seen from E of FIG. 6, FIG. 8 is a side view of a main part of the work attachment, and FIG. 9 is a sectional view of the bucket mounting portion seen from AA of FIG. The figure is BB in Figure 8.
It is sectional drawing of the pin connection part seen more. 1,19 …… Work attachment 2,18,18 _A , 18 _B …… Arm 3,20,33 …… Bucket 4,21 …… Bucket link 7,24 …… Bucket mounting part 9,15,26,38, 43 …… Boss 10,16,27 …… Side hole 11,11 ′, 28,40,45 …… Bush with collar 12,29,35 …… Pin 13,13 ′, 30,34 …… Bracket 14, 14 ′, 31,37 …… Brim 32,32 ′ …… Cylindrical part

Claims (3)

[Scope of utility model registration request] 1. A work attachment of a hydraulic excavator in which a bush with a collar is fitted in side holes on the left and right sides of a boss at the tip of an arm, and a bucket is rotatably connected to the boss via a pin. The outer width of each tip boss is smaller than the outer width of the smallest model in the bucket mounting section, and the pin diameter is larger than the maximum pin diameter of the bucket mounting section pins. Make the outer diameter of the cylinder equal to the inner diameter of the boss side hole, and add the thicknesses of the left and right collars and the outer width of the arm tip boss to the inner width of the opposing bucket bracket. In order to make them equal, the collar thickness is made to correspond to the outer width dimension of the smaller model in order from the largest model in the bucket mounting part, and the inner diameter of the bush with a brim is pin of the bucket mounting part. Arm structure for a construction machine characterized by being configured to include a plurality of types of flanged bushings allowed to correspond to successively compact models from the largest diameter. 2. The arm structure for a construction machine according to claim 1 of the utility model registration, wherein a detent means is provided for the bush with a collar fitted into the side hole on the left and right of the boss at the tip of the arm. An arm structure for construction machinery characterized by being configured as follows. 3. The arm structure of a construction machine according to claim 1 of the utility model registration, wherein the bucket link and the idler link provided to the arm tip and the bucket are changed in length and replaced. An arm structure for a construction machine, characterized by being configured to