JP3530028B2 - Flanged bush - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush with a collar suitable for rotatably supporting an upper roller, a lower roller, etc. for guiding a crawler belt of a construction machine.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
It is composed of an undercarriage equipped with a crawler belt and the like, and an upper revolving structure equipped with a working device that is rotatably mounted on the undercarriage and that performs excavation work and the like. Further, the lower traveling body is provided with an upper roller, a lower roller, etc. for guiding the crawler belt in the orbiting direction, and the upper roller and the lower roller are rotatably attached to the track frame of the lower traveling body via a flanged bush. ing.

Therefore, the collared bush will be described. The collared bush is a cylindrical portion that is press-fitted into a hole of a counterpart member, and the end portion of the cylindrical portion is bent outward in the radial direction. The cylindrical portion is constituted by a flange portion that comes into contact with the end surface of the counterpart member when the cylindrical portion is press-fitted into the hole, and the shaft portions of the upper roller and the lower roller are rotatably supported in the cylindrical portion. Further, the flanged bush receives the load of the shaft portion in the radial direction (radial direction) at the cylindrical portion, and receives the load of the shaft portion in the axial direction (thrust direction) at the flange portion.

On the other hand, in the flanged bush, when the cylindrical portion is press-fitted into the hole of the counterpart member, the diameter of the cylindrical portion is reduced inward in the radial direction, and the inner diameter side of the flange portion is pulled by the reduced diameter of the cylindrical portion. . For this reason, when the cylindrical portion is press-fitted, the collar portion is inclined forward (on the side opposite to the cylindrical portion), and a gap is formed between the outer peripheral side and the end surface of the collar portion.

Therefore, as a bush with a collar, there is known one having a structure for preventing the collar portion from tilting when the cylindrical portion is press-fitted (for example, Japanese Utility Model Laid-Open No. 59-92218). Further, in this conventional bush with a collar, in consideration of the fact that the collar portion is inclined to the side opposite to the cylindrical portion due to the press-fitting of the cylindrical portion, the collar portion is preliminarily in a free state before being press-fitted into the hole of the counterpart member. Is tilted rearward (toward the cylindrical portion).

Thus, when the cylindrical portion of the flanged bush is press-fitted into the hole of the mating member, the collar portion tilts forward, but since the collar portion is preliminarily tilted rearward, it is substantially perpendicular to the cylindrical portion. It will be in a state of being in close contact with the end surface of the other member.

[0007]

By the way, in the above-described conventional collared bush, the collar portion is preliminarily tilted backward in the free state, so that the collar portion is pressed into the hole of the mating member. It is arranged almost at right angles to the part.

However, in recent years, from the viewpoint of improving productivity and reducing cost, a collar portion is integrally formed at the end of the cylindrical portion by drawing. In this case, since the back surface side of the collar portion becomes a concave curved surface due to stress during drawing, a gap is formed between the concave curved surface of the collar portion and the end surface of the counterpart member. For this reason, when the collar portion receives a load in the thrust direction, the collar portion is repeatedly deformed by the amount of this gap, which may cause metal fatigue and damage the collar portion.

Further, in the conventional bush with a collar, the preset inclination of the collar is set on the basis of the surface of the collar with which the shaft of the roller abuts. However, since the flange portion is formed by drawing, the collar portion thickness dimension of the outer peripheral side than the thickness of the inner peripheral side is reduced. Therefore, when the bush with collar is press-fitted into the hole of the counterpart member, a gap is formed between the outer peripheral side of the flange portion and the end surface of the counterpart member, and the same problem as described above occurs.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to prevent the damage of the collar portion by bringing the collar portion into close contact with the end surface of the mating member, thereby improving the life and reliability. To provide a bush with a collar that can improve the

[0011]

A flanged bush according to the present invention comprises a cylindrical portion which is press-fitted into a hole of a counterpart member by processing a single metal plate, and an end portion of the cylindrical portion. The flange portion is bent outward in the radial direction and comes into contact with the end surface of the cylindrical portion when the cylindrical portion is press-fitted into the hole of the counterpart member.
Rikatachi have been made.

Then, in order to solve the above-mentioned problems,
Features of the configuration invention of claim 1 is adopted, and said cylindrical portion and a flange portion at the time of machining using a single metal plate, the flange portion is concave curvature is the back side becomes a surface side of a convex curved surface Face and
The formed inclined towards after folding position or al of the cylindrical portion so that the slope dimensions rearward of the flange portion is L, the deepest deepest portion of the concave curved surface at a rear surface side of the flange portion When the height dimension is up to H, the inclination dimension L is set to be larger than the height dimension H.

[0013] By having such a configuration, when press fitting the cylindrical portion of the flanged bush made of one metal plate into the hole of the mating member Kiniwa flange portion a cylindrical portion is reduced in diameter forward (cylindrical portion However, since the collar portion is preliminarily inclined rearward (toward the cylindrical portion), the collar portion is arranged substantially at right angles to the cylindrical portion. When the further press-fitting the cylindrical portion, the back surface side of the flange portion, the inclination length L of the rear is set to greater relationship than the height H of the concave curved surface of the flange portion, the rear surface of the flange portion With respect to the side, the outer peripheral side first contacts the end surface of the counterpart member. Therefore, by further press-fitting the cylindrical portion into the hole of the mating member from this position, the concave curved surface of the collar part can be flattened by the pressing force at the time of press-fitting, and the collar part can be brought into close contact with the end surface of the mating member. it can.

[0014] The feature of the configuration invention of claim 2 is employed, when machining a cylindrical portion and a flange portion with a single metal plate, the flange portion is made the surface side of a convex curved surface Back
Bend position with the cylindrical part so that the side becomes a concave curved surface .
Formed inclined towards after al, the back surface side of the flange portion, the axial dimension between the tip back angle corners of the flange portion and the back angle corner portion serving as a folding position of the cylindrical portion L in a to the rear surface side of the flange portion
The deepest height at the deepest portion between the concave curved surface from a line connecting the said and the back angle corner tip back angle corner is taken as H, than the height H the slope dimension L Relationship
Has been set to.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An upper roller for guiding a crawler bush of a construction machine according to an embodiment of the present invention will be described below.
A case where the lower roller and the like are rotatably supported is given as an example, and will be described in detail with reference to FIGS.

Reference numeral 1 denotes a housing provided on a track frame of a lower traveling body of a construction machine, for mounting an upper roller and a lower roller (neither shown) on the track frame. Then, the roller supporting hole 3 is formed. Further, the roller support hole 3 is formed in the direction perpendicular to the end surface 2. The roller support hole 3 rotatably supports the shaft portion of the roller that guides the crawler belt (not shown) in the circumferential direction via a bush 11 with a collar described later.

Reference numeral 11 denotes a flanged bush inserted into the roller supporting hole 3 of the housing 1, and the flanged bush 11 is
For example, it is formed by bending or drawing one sheet of metal, and as shown in FIG. 2 and FIG. 3, it is roughly composed of a cylindrical portion 12 and a collar portion 14 described later.

Reference numeral 12 denotes a cylindrical portion forming the main body of the flanged bush 11, and a radial bearing 13 made of a self-lubricating material is formed on the inner peripheral side of the cylindrical portion 12. The outer diameter of the cylindrical portion 12 is formed to be slightly larger than the inner diameter of the roller supporting hole 3, whereby the cylindrical portion 12 is press fitted into the roller supporting hole 3.

Reference numeral 14 denotes a flange portion provided on one end side of the cylindrical portion 12, and the flange portion 14 is bent by drawing the end portion of the cylindrical portion 12 and bent so as to extend outward in the radial direction. It is formed into a shape. Therefore, as shown in FIG. 4, the flange portion 14 has a convex curved surface 14A having a front surface protruding forward and a rear surface having a concave curved surface in a free state before the cylindrical portion 12 is inserted into the roller supporting hole 3. It is the surface 14B. Further, the thickness of the collar portion 14 is t near the bending position 14C on the inner peripheral side.
It is as thick as 1 and as thin as t2 at the tip position 14D on the outer peripheral side.

Next, the design conditions for forming the collar portion 14 will be described. When the cylindrical portion 12 is press-fitted into the roller support hole 3, the cylindrical portion 12 is reduced in diameter in the radial direction and the collar portion is formed. 14 is inclined forward (on the side opposite to the cylindrical portion 12). Therefore, the collar portion 14 is rearward (on the side of the cylindrical portion 12) in the free state before the cylindrical portion 12 is inserted into the roller support hole 3.
When it is formed by inclining to the front and the inclination dimension is L, this dimension L is determined by the back corner A of the bending position 14C and the tip position 14D.
Is set as the axial length between the back corner and the corner B.

If the deepest part where the concave curved surface 14B is the deepest is C between the line AB connecting the back corner A of the bending position 14C and the back corner B of the tip position 14D, these back corners The height dimension from the line connecting the corners A and B to the deepest portion C of the concave curved surface 14B is set to H.

The relationship between the inclination dimension L of the collar portion 14 and the height dimension H of the concave curved surface 14B is given by the following mathematical expression 1.

[0023]

[Equation 1] L> H

As a result, when the cylindrical portion 12 is press-fitted into the roller support hole 3 of the housing 1, the inclination dimension L of the collar portion 14 is larger than the height dimension H of the concave curved surface 14B, as shown in FIG. The back corner B of the front end position 14D of the collar 14 comes into contact with the end surface 2 first.

Also, the inclination dimension L and the height dimension H of these
Is a concave curved surface 14B of the collar portion 14 that comes into contact with the end surface 2 when the bush 11 with the collar is inserted into the roller support hole 3.
They are set on the basis of (back side).

As a result, even when the inner peripheral side thickness of the collar 14 is as thick as t1 and the outer peripheral side thickness is as small as t2, when the flanged bush 11 is pressed into the roller support hole 3, the reference The concave curved surface 14B side of the flange portion 14 that becomes the surface can be brought into close contact with the end surface 2 of the housing 1.

Reference numeral 15 is an annular thrust bearing provided on the convex curved surface 14A of the collar portion 14. The thrust bearing 15 is
It slides on the shaft of the roller, and is made of a material having self-lubricating properties, like the radial bearing 13 described above.

The flanged bush 11 according to the present embodiment has the above-mentioned structure. Next, the shape change of the flange portion 14 when the flanged bush 11 is pressed into the roller support hole 3 of the housing 1 will be described. To do.

First, the other end of the cylindrical portion 12 is applied to the opening on the end face 2 side of the roller support hole 3, and when the cylindrical portion 12 is pressed into the roller support hole 3 in this state, the cylindrical portion 12 contracts. The diameter causes the collar portion 14 to tilt forward. However, Mitsube 1
Since 4 is tilted backward in advance, the collar portion 14 is arranged in a substantially right angle state with respect to the cylindrical portion 12 as shown in FIG.

The inclination dimension L of the collar portion 14 is determined by
Since it is set to be larger than the height dimension H of the concave curved surface 14B, when the cylindrical portion 12 is press-fitted, the tip position 14D of the collar portion 14 comes into contact with the end surface 2 first, as shown in FIG. . Then, when the cylindrical portion 12 is further press-fitted from this position, the collar portion 14 is pressed against the end surface 2, so that the collar portion 14 is pressed.
6 is corrected, and as shown in FIG. 6, the concave curved surface 14B of the collar portion 14 is brought into close contact with the end surface 2 in a flatly corrected state.

Further, the inclination dimension L of the collar portion 14 and the concave curved surface 1
The height dimension H of 4B is set on the basis of the concave curved surface 14B of the collar portion 14 that contacts the end surface 2, so that even if the thickness dimension of the collar portion 14 varies, Concave curved surface 14 that serves as a reference surface regardless of variations
The B side can be brought into close contact with the end surface 2.

As described above, according to the present embodiment, the collar portion 14 is tilted rearward in advance, and the inclination dimension L is set larger than the height dimension H of the concave curved surface 14B. When the cylindrical portion 12 is pressed into the roller support hole 3,
The collar portion 14 can be arranged substantially at right angles to the cylindrical portion 12.

Further, when the cylindrical portion 12 is press-fitted into the roller support hole 3, the tip position 14D of the collar portion 14 is first pressed against the end surface 2 of the housing 1 to correct the curved shape of the collar portion 14, The collar portion 14 can be brought into close contact with the end surface 2. Therefore, it is possible to prevent the collar portion 14 from being damaged by the deformation due to the load in the thrust direction, so that it is possible to extend the life of the collared bush 11 and improve the reliability.

Further, the inclination dimension L of the collar portion 14 and the concave curved surface 1
Since the height dimension H of 4B is set with reference to the concave curved surface 14B side of the collar portion 14 that contacts the end surface 2,
Regardless of variations in the thickness of the collar portion 14, the concave curved surface 1
4B can be brought into close contact with the end surface 2, which also prevents deformation of the collar portion 14 and improves the life and reliability.

[0035]

Further, in the embodiment, the bush 1 with a collar is used.
1 has been described as an example in which it is used to rotatably support the upper roller and the lower roller that guide the crawler belt of the hydraulic excavator, but the flanged bush of the present invention is not limited to this, and, for example, a hydraulic crane. It can also be applied to other construction machines such as bulldozers and various industrial machines.

[0037]

As described in detail above, according to the present invention, when the cylindrical portion and the flange portion are machined using one metal plate ,
The flange side has a convex curved surface on the front side and a concave bay on the back side.
Formed inclined towards after folding position or al of the cylindrical portion so that the curved surface, the inclination dimensions rearward of the flange portion is L,
To the deepest and deepest part of the concave curved surface on the back side of the collar part
When the height dimension of is set to H, the inclination dimension L is set to the height dimension.
Since the relationship is set to be larger than the method H, even if the diameter of the cylindrical portion is reduced by press-fitting the cylindrical portion into the hole of the mating member, the collar portion can be arranged almost at right angles to the cylindrical portion. it can. Then, when the cylindrical portion is further press-fitted, the outer peripheral side of the flange portion can be brought into contact with the end surface of the counterpart member first, and by further press-fitting the cylindrical portion into the hole of the counterpart member, the press-fitting is performed. The concave curved surface of the collar portion can be flattened by the pressing force at that time, and the collar portion can be brought into close contact with the end surface of the counterpart member. Therefore, it is possible to prevent the collar portion from being damaged by the deformation due to the axial load, and it is possible to extend the life of the collared bush and improve the reliability.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a state where a bush with a collar according to an embodiment of the present invention is press-fitted into a hole of a mating member.

FIG. 2 is a vertical sectional view showing a single bush with a collar.

FIG. 3 is a right side view of FIG. 2 showing a bush with a collar.

FIG. 4 is an enlarged vertical sectional view of an essential part showing an enlarged essential part of a bush with a collar.

FIG. 5 is an enlarged vertical sectional view of an essential part showing a state in which a flanged bush is press-fitted into a hole of a mating member.

FIG. 6 is an enlarged longitudinal sectional view of an essential part showing a state in which the flanged bush is completely press-fitted into the hole of the counterpart member.

[Explanation of symbols]

1 Housing (counterpart member) 2 end face 3 Roller support hole 11 Bush with collar 12 Cylindrical part 14 Tsubabe 14A Convex curved surface (front surface) 14B concave curved surface (back side) 14C bending position 14D tip position t1 Thickness of inner side of collar t2 Thickness of the outer circumference of the collar A Back corner of the bending position B Back corner of the tip position C deepest part of concave curved surface H Height of concave curved surface of flange Inclination of L collar

─────────────────────────────────────────────────── --- Continuation of front page (56) References JP-A-4-321813 (JP, A) JP-A-7-4435 (JP, A) Actual development Sho-59-92218 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F16B 4/00 F16C 13/00-15/00

Claims (2)

(57) [Claims] 1. By processing one metal plate,
A cylindrical portion that is press-fitted into a hole of a counterpart member, and a collar that is bent outward in the radial direction from the end portion of the cylindrical portion and that abuts the end surface of the cylindrical portion when the cylindrical portion is press-fitted into the hole of the counterpart member. in flanged bushing formed by formed by the parts, and said cylindrical portion and a flange portion at the time of machining using a single metal plate, the flange portion, the rear surface side becomes a surface side of a convex curved surface
There folded position or al of the cylindrical portion so that the concave curved surface
Formed inclined towards the rear, and the tilt dimensions rearward of the front Kitsuba portion is L, the rear surface of the flange portion
Side, the height dimension to the deepest and deepest part of the concave curved surface is H
In this case, the bushing with a collar is set such that the inclination dimension L is larger than the height dimension H. 2. By processing one metal plate,
A cylindrical portion that is press-fitted into a hole of a counterpart member, and a collar that is bent outward in the radial direction from the end portion of the cylindrical portion and that abuts the end surface of the cylindrical portion when the cylindrical portion is press-fitted into the hole of the counterpart member. in flanged bushing formed by formed by the parts, and said cylindrical portion and a flange portion at the time of machining using a single metal plate, the flange portion, the rear surface side becomes a surface side of a convex curved surface
There folded position or al of the cylindrical portion so that the concave curved surface
Formed inclined towards the rear, the back side of the flange portion, the bending becomes position <br/> back angle corners between the cylindrical part (A) and the tip back angle corners of the collar portion (B) And the axial dimension between and is L, and the back corner is on the back side of the collar.
Part deepest deepest (C) or the height at the tip back angle corner (B) and the <br/> concave curved surface from the line connecting the (A) is when the H, the inclination Dimension L is greater than height dimension H
Bush with a collar, which is characterized by the following relationship .