JP2002089539A - Connecting structure of pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain wear at a connecting portion of a pin. SOLUTION: Bushes with flange 16 are fitted into pin holes 14 of a boss 11 as an inside member and brackets 12, 13 as an outside member to be disposed at the sides of the boss 11. A connecting pin 15 is inserted gross the bushes 16, and each of the flange portions 16a of the bushes 16 is interposed between the boss 11 and the bracket 12 and between the boss 11 and the bracket 13. Where, bushes 16 are made of the same material with the same hardness, and have the same shape and size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin connecting structure for connecting an outer member and an inner member by pins inserted over respective pin holes.

[0002]

2. Description of the Related Art The prior art and its problems will be described by taking a self-propelled cutting machine as an example.

[0003] In FIG. 3, reference numeral 1 denotes a base machine comprising a crawler type lower traveling body 1a and an upper revolving superstructure 1b. A boom 2 is mounted on the upper revolving superstructure 1b of the base machine 1 so as to be able to move up and down. At the tip, a pair of blades 3a,
An openable / closable shear 3 that cuts a steel material or the like between 3b is attached to constitute a cutting machine.

One of the two blades 3a and 3b of the shear 3 is a fixed blade, and the other is a movable blade. This conventional pin connection structure is shown in FIG.

A boss 5 as an inner member is attached to one of the blades 3a.
Brackets 6 and 7 as outer members are provided on the other blade 3b, respectively, and these fit inside and outside. In some cases, the boss 5 is provided on the blade 3b side, and the brackets 6, 7 are provided on the blade 3a side.

The boss 5 and the brackets 6 on both sides are provided with pin holes 8 respectively, and the coupling pin 4 is inserted across the pin holes 8. The pins 4 are coupled so as to be rotatable relative to each other.

[0007] The coupling pin 4 is formed as a flanged pin having a flange 4a integrally formed at one end, and a separate detachable flange 9 is attached to the other end of the pin 4 so that the pin 4 is pivoted. It is locked in the direction. Reference numerals 10 and 10 are bolts for fixing the flange body 9 to one bracket 6.

[0008]

However, according to the conventional pin connection structure, since the brackets 6, 7 and the boss 5 are made of different materials and have different hardnesses, the member on the lower hardness side has the other member. Wear easily on the contact surface with

In this case, FIG. 4 shows a state in which a relatively large gap is formed between the boss 5 and the brackets 6 on both sides. In practice, however, the rattling of the connecting portions of the blades 3a and 3b may be reduced. This gap is set to be as small as possible in order to prevent and secure a good sharpness, and the abrasion of the contact portion becomes severe.

For this reason, the gap between the blades is increased and the sharpness is extremely lowered. In order to avoid this, frequent maintenance is required, so that the maintenance of the pin connection portion becomes troublesome, and early repair is performed. -There were problems such as the need for replacement.

Accordingly, the present invention provides a pin connection structure that can suppress wear of a pin connection portion.

[0012]

According to the first aspect of the present invention, a pin hole is provided in an inner member and both outer members disposed on both outer sides of the inner member, and the material, shape and size of the pin hole are changed. A flanged bush, which is the same common part, is fitted with each flange protruding out of the pin hole, and with the flanges of adjacent bushes abutting against each other, and inserting the coupling pin across each bush. It is.

According to a second aspect of the present invention, in the configuration of the first aspect, the outer members on both sides are formed as an integral body having a fixed distance from each other, and the bush is fitted into a pin hole of at least one of the outer members. A gap is formed between the flange portion and a surface of the outer member facing the flange portion,
The bush is configured to be able to move in the axial direction of the coupling pin in the range of the gap.

According to a third aspect of the present invention, in the configuration of the second aspect, flanges are provided at both ends of the connecting pin, and at least one of the flanges is provided as a detachable flange which is detachable from the pin. The detachable flange body is bolted to the connecting pin in a state where the inner member is inserted into the bushing, so that the bush is pushed in the pin axial direction so that the flange portions of each bush come into contact with each other.

According to a fourth aspect of the present invention, in the configuration of the third aspect, an adjustment shim is interposed between the detachable flange body and an end face of the bush opposed to the flange body.

According to a fifth aspect of the present invention, in the configuration of the third or fourth aspect, a protective cover is provided for externally covering a head of a bolt for fixing the detachable flange to the connecting pin.

According to a sixth aspect of the present invention, in the configuration of any one of the third to fifth aspects, the detachable flange is fixed to the outer member so that the collar also functions as a detent member for the connecting pin. It was done.

According to a seventh aspect of the present invention, in the configuration of any one of the first to sixth aspects, one blade of a shear for cutting a steel material or the like between a pair of blades is an inner member, and the other blade is an outer member. It is composed.

According to the above arrangement, the flange of the flanged bush is interposed between the inner member and the outer member.
Wear due to contact between both outer members is eliminated. In addition, since the bush is made of the same material and has the same hardness, wear of the flange of the bush can be suppressed.

Therefore, it is possible to suppress the occurrence of a gap at the pin connection portion due to the wear and the occurrence of rattling due to the wear, and it is possible to ensure a good sharpness by the pair of blades in the shear of the present invention.

Moreover, since each bush is a common part having the same material and shape and size in addition to the same material, it is easy to manage parts, including the same degree of wear and replacement time.

According to the second aspect of the present invention, a flange portion of the bush fitted into the pin hole of at least one of the outer members;
Since a gap is formed between the flange portion and the surface of the outer member facing the outer member, the bush can move in the axial direction of the connecting pin within the range of the gap. When the inner member is fitted in the bush, a gap is provided between the bushes so that the fitting operation can be performed easily and quickly.

According to the third aspect of the present invention, the detachable flange is fixed to the coupling pin by a bolt to push the bush in the axial direction to fill the gap between the bush flange and the outer member. Since the flanges of each bush can be reliably brought into contact with each other, the inner and outer members can be joined without play without any unnecessary gap.

According to the fourth aspect of the present invention, the adjustment shim is interposed between the detachable flange body and the end face of the bush opposed to the flange body. When a gap is formed between the parts, the gap can be filled by adding an adjustment shim to prevent rattling.

According to the structure of claim 5, the head of the bolt for fixing the detachable flange to the connecting pin can be covered from the outside by the protective cover, so that the bolt head comes into contact with an external obstacle and is damaged. There is no danger of bolts being loosened or coming off.

According to the sixth aspect of the present invention, the connecting pin is fixed to the outer member via the detachable flange, and the flange also functions as a pin detent member. Points can be reduced.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

First Embodiment (Refer to FIG. 1) In FIG. 1, reference numeral 11 denotes a boss as an inner member, and brackets 12 and 13 as an outer member, which are integral members, are fitted into the left and right outer sides of the boss 11, respectively. These are connected by a connecting pin 15 inserted across the pin holes 14 of each other.

A cylindrical bush 16 with a flange having a flange 16a at one end is fitted into each of the pin holes 14 so that the flanges 16a, 16a, which are adjacent to each other, come into contact with each other.

Each of the bushes 16 is made of the same material (preferably a metal having a high hardness, for example, carbon steel "S45C"), and is subjected to induction hardening on the surface of the flange portion 16a to obtain a surface hardness of 70 to 80 Shore hardness. (Finished parts) are formed as common parts having the same shape and size.

According to this configuration, since the boss 11 and the brackets 12 and 13 on both sides have the bushes 16 interposed therebetween, there is no fear of wear due to direct contact.

The flanges 1 of the bushes 16 which come into contact with each other
6a are made of the same material and have the same hardness at their contacting parts, so that their wear is suppressed and the life of the parts is prolonged.

Further, even if worn, the degree of the wear is the same in terms of time and it is sufficient to replace them at the same time. Since the boss side and the bracket side can be made of exactly the same parts, there is no need to store or procure them separately. For this reason, maintenance and parts management become easy, and the cost for the maintenance can be reduced.

In addition, since the bush 16 need only be replaced when worn, the labor and cost for replacement are much lower than when the boss 11 and the brackets 12, 13 are replaced.

A gap c is formed between a flange 16a of the bush 16 mounted on one of the brackets 13 (the left side in FIG. 1) of the bush 16 and a side surface of the bracket 13 which comes into contact with the flange 16. The bush (hereinafter, referred to as a movable bush and denoted by a symbol “′” and denoted by 16 ′) is movable in the pin axis direction within the range of the gap c.

In this way, when the boss 11 is fitted between the brackets 12 and 13 on both sides, the movable bush 16 'is moved away from the adjacent boss-side bush 16 so that the fitting operation can be simplified. Can be done quickly.

The gap c may be provided between the other bracket 12 (right side in the figure) and the flange 16a of the bush 16.

On the other hand, a flange member 17 having a diameter larger than the pin diameter is detachably attached to an end surface of the coupling pin 15 opposite to the flange portion 15a by bolts 18. The pin 15 is prevented from coming off in the axial direction by the portion 16a.

The movable bush 1 is provided with a convex portion 17a on the inner surface of the flange body 17 over the entire circumference (may be partly in the circumferential direction).
The convex portion 17a pushes the movable bush 16 'so that the movable bush 16' can be reliably brought into contact with the adjacent boss-side bush 16 when the flange 17 is attached.

As a result, it is possible to prevent rattling of the movable bush 16 ', which is an adverse effect of providing the movable bush 16' (gap c).

Further, an adjustment shim 19 is interposed between the contact surface between the convex portion 17a and the movable bush 16 '. In this case, when the contact surface between the movable bush 16 'and the boss-side bush 16 is worn with long-term use, and a gap is generated between the contact surfaces, the adjustment shim 19 is additionally provided. The gap can be filled.

Further, bolts 18...
Is attached to the bracket 13 on the side where the flange body 17 is provided by bolts 21.
8 are prevented from contacting with external obstacles, so that damage, loosening and detachment are prevented.

Since the flange 20 is also fixed in the circumferential direction by fixing the cover 20 to the bracket 13, the connecting pin 15 to which the flange 17 is attached is prevented from rotating. That is, the protective cover 20 serves both as a stopper for the pin 15 and as a stopper.

Second Embodiment (See FIG. 2) Only differences from the first embodiment will be described.
Are attached to both the connecting pin 15 and one of the brackets 13 without the protective cover 20 by bolts 23.

Here, the flange body 22 is formed to be thicker than the flange body 17 of the first embodiment, and the heads 23a of the bolts 23 are fitted into concave portions 24 provided on the outer surface thereof. In.

In this manner, as in the first embodiment, the collar body 22 serves as both a stopper for the pin 15 and a stopper for the pin 15 and prevents contact between the bolt heads 23a and the external obstacles. The protective cover 20 of one embodiment can be omitted. For this reason, the number of parts and assembly man-hours are reduced,
Parts costs and assembly costs can be reduced.

In this embodiment, a convex portion and an adjusting shim which have the same functions as the convex portion 17a and the adjusting shim 19 of the collar body 17 in the first embodiment may be provided.

By the way, in the above embodiment, the connecting pin 1
Although the detachable flange body 17 is provided at the tip as a flanged pin having a flange portion 15a on one end side, a detachable flange body may be provided at both ends using the pin 15 as a flangeless pin.

In the above embodiment, the pin connection structure in the case where the both brackets 12 and 13 are integral is taken as an example. can do.

Further, the present invention can be widely applied not only to the pin connection portions of the blades 3a and 3b in the shear 3 of the cutting machine shown in FIG. 3, but also to the pin connection portions of various machines.

[0051]

According to the present invention as described above, a flanged bush is fitted into the pin holes of the inner member and the outer member.
Since the flange of the bush is interposed between the inner and outer members, wear due to contact between the inner and outer members is eliminated. Further, since the bush is formed of the same material and set to the same hardness, wear of the flange of the bush can be suppressed.

Therefore, it is possible to suppress the occurrence of a gap at the pin connection portion due to wear and the occurrence of rattling due to the wear, and it is possible to secure a good sharpness by the pair of blades in, for example, the shear of claim 7.

Furthermore, since each bush is a common part having the same shape and size in addition to the same material, parts management is facilitated, including the same degree of wear and replacement time.

According to the invention of claim 2, a flange portion of the bush to be fitted into the pin hole of at least one outer member,
Since a gap is formed between the flange portion and the surface of the outer member facing the outer member, the bush can move in the axial direction of the connecting pin within the range of the gap. When the inner member is fitted in the bush, a gap is provided between the bushes so that the fitting operation can be performed easily and quickly.

According to the third aspect of the present invention, the detachable flange is bolted to the connecting pin to push the bush in the axial direction, thereby filling the gap between the bush flange and the outer member. Since the flanges of each bush can be reliably brought into contact with each other, the inner and outer members can be joined without play without any unnecessary gap.

According to the fourth aspect of the present invention, the adjusting shim is interposed between the detachable flange body and the end face of the bush opposed to the flange body. When a gap is formed between the parts, the gap can be filled by adding an adjustment shim to prevent rattling.

According to the fifth aspect of the present invention, since the body of the bolt for fixing the detachable flange to the connecting pin can be covered from the outside by the protective cover, the head of the bolt comes into contact with an external obstacle. There is no risk of damage, loosening or removal of bolts.

According to the sixth aspect of the present invention, the connecting pin is fixed to the outer member via the detachable flange, and the flange also functions as a pin detent member. Points can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pin connection portion according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a pin connection part according to a second embodiment of the present invention.

FIG. 3 is an overall schematic side view of a cutting machine as an example of an applied machine.

FIG. 4 is a cross-sectional view showing a conventional pin connection structure.

[Explanation of symbols]

 Reference Signs List 11 Boss as inner member 12, 13 Bracket as outer member 14 Pin hole 16 Flanged bush 16a Flange of bush c Gap between bush flange and bracket 15 Connection pin 17 Detachable flange 17a Convex part 18 Bolt for mounting flange body 19 Adjustment shim 20 Protective cover 21 Bolt for mounting protective cover 22 Removable flange body 23 Bolt for mounting flange body

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Osamu Mori Inventor F-term in Kobelco Construction Machinery Engineering Co., Ltd. 3-12-25 Gion, Asaminami-ku, Hiroshima 2D015 AA01 3J105 AA14 AB07 AC02 DA02

Claims (7)

[Claims] 1. A pin hole is provided in an inner member and both outer members disposed on both outer sides of the inner member, and a flanged bush, which is a common component having the same material, shape and size, is provided in each of the pin holes. A pin connecting structure in which the flanges protrude out of the pin holes and are fitted in a state where the flanges of adjacent bushes are in surface contact with each other, and the connecting pin is inserted across each of the bushes. 2. A method according to claim 1, wherein the outer members on both sides are formed as an integral member having a fixed distance from each other, and a flange portion of a bush fitted into a pin hole of at least one outer member; 2. The pin connecting structure according to claim 1, wherein a gap is formed between the facing surface and the bush so that the bush can move in the axial direction of the connecting pin within the range of the gap. 3. A flange body is provided at both ends of a connecting pin, and at least one of the flange bodies is provided as a detachable flange body detachable from the pin, and the detachable flange is provided with an inner member inserted between both outer members. The pin connection structure according to claim 2, wherein the body is fixed to the connection pin by a bolt so that the bush is pushed in the pin axial direction so that the flange portions of each bush come into contact with each other. 4. The pin connection structure according to claim 3, wherein an adjustment shim is interposed between the detachable flange body and an end face of the bush opposed to the flange body. 5. The pin coupling structure according to claim 3, further comprising a protective cover for covering a head of a bolt for fixing the detachable flange body to the coupling pin from outside. 6. The fixing device according to claim 3, wherein the detachable flange is fixed to the outer member so that the flange also serves as a detent member for the connecting pin. Pin connection structure. 7. The shear according to claim 1, wherein one of the shears for cutting the steel material or the like between the pair of blades is an inner member, and the other blade is an outer member. Pin connection structure.