KR20230133597A - Sliding bearing and construction machinery including the same - Google Patents

Abstract

The sliding bearing according to an embodiment of the present invention is a sliding bearing in which a tapered portion is formed on one side of the outer peripheral surface. The tapered portion has a predetermined length, and the predetermined length is 25% to 37.5% of the total length of the sliding bearing.
A construction machine according to another embodiment of the present invention includes a frame, a housing, a pin, and a sliding bearing. The frame has a first connector and the housing has a second connector connected to the first connector. Pins are disposed within the first connection portion and the second connection portion. The sliding bearing is disposed between the pin and the second connection portion, and a tapered portion is formed on one side of the outer peripheral surface. The tapered portion has a predetermined length, and the predetermined length is 25% to 37.5% of the total length of the sliding bearing.

Description

Sliding bearings and construction machinery including them {SLIDING BEARING AND CONSTRUCTION MACHINERY INCLUDING THE SAME}

The present invention relates to sliding bearings, and more specifically, to sliding bearings that can minimize wear and noise in sliding bearings and construction machinery including the same.

In construction machinery, sliding bearings are mainly used in shaft rotation or joints. The sliding bearing surrounds the shaft and supplies lubricant to reduce wear caused by friction that occurs during movement. A sliding bearing acts as a type of bushing or bush.

In construction machinery (specifically, excavators), sliding bearings are used in a press-fitted state in the connection part of the housing (housing of the boom), and when excessive load is applied to the housing (or when the above harsh conditions persist), the pin Pin bending may occur. Due to the bending of the pin, the pin comes into contact with a local area of the inner peripheral surface of the sliding bearing, and the surface pressure in that local area can become very high. As a result, wear and noise may occur in the local area (contact surface) of the sliding bearing.

Republic of Korea Patent Publication No. 10-2012-0053414 (publication date May 25, 2012))

Therefore, the purpose of the present invention to solve the above-mentioned problems is to ensure the tolerance between the pin and the sliding bearing even in the harsh environment of construction equipment, thereby minimizing the occurrence of wear and noise in the sliding bearing. To provide sliding bearings and construction machinery including them.

However, the problem to be solved by the present invention is not limited to the above objectives, and may be expanded in various ways without departing from the spirit and scope of the present invention.

In order to solve the problem to be solved by the present invention, in an exemplary embodiment of the present invention, a sliding bearing having a tapered portion formed on one outer peripheral surface, when forcibly fitted into the connection part of the housing, slides by clamping force and/or clamping amount. Since a tapered portion is formed on one side of the inner peripheral surface, a sliding bearing and a construction machine including the same are provided, which can reduce the local surface pressure at the end of the sliding bearing by using this.

The sliding bearing according to an embodiment of the present invention is a sliding bearing in which a tapered portion is formed on one side of the outer peripheral surface. The tapered portion has a predetermined length, and the predetermined length is 25% to 37.5% of the total length of the sliding bearing.

A construction machine according to another embodiment of the present invention includes a frame, a housing, a pin, and a sliding bearing. The frame has a first connector and the housing has a second connector connected to the first connector. Pins are disposed within the first connection portion and the second connection portion. The sliding bearing is disposed between the pin and the second connection portion, and a tapered portion is formed on one side of the outer peripheral surface. The tapered portion has a predetermined length, and the predetermined length is 25% to 37.5% of the total length of the sliding bearing.

According to one embodiment, when the sliding bearing is press-fitted into the second connection part of the housing, a tapered portion is formed on one side of the inner peripheral surface of the sliding bearing.

According to one embodiment, the length of the tapered portion formed on one side of the outer peripheral surface of the sliding bearing is the same as the length of the tapered portion formed on one side of the inner peripheral surface of the sliding bearing.

According to one embodiment, the tapered portion formed on one side of the inner peripheral surface of the sliding bearing has a maximum depth at an end, and the maximum depth is greater than 0 and less than 0.5% of the thickness of the sliding bearing.

According to one embodiment, the maximum depth (TD1) of the tapered portion formed on one side of the outer circumferential surface of the sliding bearing and the maximum depth (TD2) of the tapered portion formed on one side of the inner circumferential surface of the sliding bearing are calculated using a relational equation, and the relational equation is as follows [mathematics] It is expressed as [Equation 1].

[Equation 1]

TD1 * clamping amount * 1.76 = TD2

The sliding bearing according to an embodiment of the present invention can minimize wear and noise on one side of the sliding bearing even when the bending of the pin exceeds a certain level under conditions of excessive load application in the housing.

However, the effects of the present invention are not limited to the above effects, and may be expanded in various ways without departing from the spirit and scope of the present invention.

Figure 1 is a schematic diagram of a sliding bearing used in construction machinery.
Figure 2 is a diagram schematically showing the pin, sliding bearing, and housing.
Figure 3 is a diagram showing a case where local surface pressure is generated in a sliding bearing due to bending of a pin.
Figure 4 is a diagram showing a case where a pin pressurizes a local area of a sliding bearing by bending the pin.
Figure 5 is a diagram showing that when the sliding bearing is press-fitted into the housing, the shape of the inner peripheral surface of the sliding bearing changes due to the clamping force.
Figure 6 is a diagram showing the change in surface pressure (local surface pressure in the sliding bearing) that appears on one side of the sliding bearing due to bending of the pin when there is or is not a tapered portion on one side of the outer peripheral surface of the sliding bearing.
Figure 7 is a diagram showing a sliding bearing according to an embodiment of the present invention.
Figure 8 is a table showing the results of surface pressure according to the length of the tapered part when applying the tapered part to the inner peripheral surface of the sliding bearing.
FIG. 9 is a diagram showing a simulation of the tapered portion application section according to the table in FIG. 8 and the surface pressure results in the application section.
Figure 10 is a diagram showing the relationship between the pin bending angle and the taper angle on the inner peripheral surface of the sliding bearing for calculating the maximum depth of the tapered portion of the inner peripheral surface of the sliding bearing.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings. Among the components of the present invention, detailed descriptions of those that can be clearly understood and easily reproduced by a person skilled in the art according to the prior art will be omitted in order to not obscure the gist of the present invention.

Additionally, the thickness or size of each component shown in the drawings is exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Additionally, the size of each component does not entirely reflect the actual size.

Below, a sliding bearing according to an embodiment of the present invention will be described.

Sliding bearings are mainly used in shaft rotation or joint parts of construction machinery. The sliding bearing surrounds the shaft and supplies lubricant to reduce wear caused by friction that occurs during movement. A sliding bearing acts as a type of bushing or bush. In the drawings below, bushings or bushes represent sliding bearings.

Figure 1 is a schematic diagram of a sliding bearing used in construction machinery.

Referring to Figure 1, the frame represents a body frame of a construction machine. For example, an excavator can be divided into a rotating body disposed at the top and a traveling body disposed at the bottom. And the excavator is provided with a boom connected to the rotating body, an arm connected to the boom, and an attachment such as a bucket connected to the arm.

The frame in FIG. 1 represents a frame of a rotating body and may include a connection portion thereof. Housing (Housing) refers to the housing of the boom and may include its connection part.

Pins are placed at the connection portion of the frame and the housing. Pins can connect the frame and housing. The housing can rotate via the pin in a direction perpendicular to the longitudinal direction of the pin.

A sliding bearing is disposed between the outer peripheral surface of the pin and the inner peripheral surface of the connection portion of the housing that can contact the outer peripheral surface of the pin.

The sliding bearing surrounds the outer circumferential surface of the pin that can be in contact with the inner circumferential surface of the connection part of the housing, and supplies lubricant to reduce wear caused by friction that occurs while the housing rotates.

Figure 2 is a diagram schematically showing the pin, sliding bearing, and housing.

Referring to Figures 1 and 2, the sliding bearing is formed in a cylindrical tubular shape. Specifically, the sliding bearing has a through hole (h, H) at the center and may be a cylinder with a predetermined length. Pins are disposed in the through holes (h, H). And the sliding bearing is disposed at the connection portion of the housing (specifically, a hole formed in the housing).

The sliding bearing has a predetermined thickness (thickness of the pipe) (th, TH). That is, the sliding bearing has a width between the outer circumference and the inner circumference.

In Figure 2, d represents the cross-sectional diameter of the through hole (h, H) of the sliding bearing, and is called the inner diameter of the sliding bearing. D represents the cross-sectional diameter of the connection part of the housing (specifically, the hole formed in the housing), and is called the inner diameter of the connection part of the housing. The inner diameter (D) of the connection part of the housing refers to the inner diameter of the connection part of the housing where the sliding bearing is disposed.

A clearance is given between the outer diameter of the pin and the inner diameter (d) of the sliding bearing. For example, in the case of excavators, the tolerance is generally 0.15 to 0.30 mm. Here, the outer diameter of the pin refers to the cross-sectional diameter measured from the outside (outer peripheral surface) of the pin. Hereinafter, the tolerance between the outer diameter of the pin and the inner diameter (d) of the sliding bearing is referred to as the 'Pin/Bush Clearance'.

The sliding bearing is arranged in the connection part of the housing. The outer diameter of the sliding bearing is larger than the inner diameter (D) of the housing connection. Therefore, the sliding bearing is inserted into the connection part of the housing in a pressure-fitting manner, and in construction machinery (for example, an excavator), the sliding bearing is used in a state of being press-fitted into the connection part of the housing. The outer diameter of a sliding bearing refers to the cross-sectional diameter measured from the outer peripheral surface of the sliding bearing.

During the operation of construction machinery, pin bending may occur if a high load is applied to the housing (housing of the boom). When pin bending occurs beyond the tolerance between the pin and the sliding bearing, the surface pressure on one side of the sliding bearing becomes very high, which can cause wear and noise.

Figure 3 is a diagram showing a case where a local surface pressure is generated on the inner peripheral surface of the sliding bearing due to bending of the pin, and Figure 4 is a diagram showing a case where the pin pressurizes a local area of the sliding bearing due to bending of the pin.

Figure 4 (a) shows a portion of the cross section of the sliding bearing 20, and a tapered portion is not formed on one side of the outer peripheral surface of the sliding bearing 20. In (b) of Figure 4, the pin 100 is disposed inside the sliding bearing 20 of (a), and when bending of the pin 100 occurs, the pin 100 is on the inner peripheral surface of the sliding bearing 20. Indicates the case of pressurizing a local area of . The sliding bearing 20 shown in FIGS. 3 and 4 represents a conventional sliding bearing. The groove formed on the inner peripheral surface of the sliding bearing 20 shown in FIG. 4 is a dimple and/or a pocket. The dimple or pocket is supplied with lubricant to prevent internal wear on the sliding contact surface between the pin 100 and the sliding bearing 20, and stores the lubricant.

Referring to FIGS. 3 and 4, the sliding bearing 20 in construction machinery (for example, an excavator) is used in a state where it is press-fitted into the connection portion of the housing, and when excessive load is applied to the housing (or the above harsh conditions) If it continues), it can be seen that the bending of the pin 100 causes the pin to contact a local area of the inner peripheral surface of the sliding bearing 20, and the surface pressure in the local area becomes very high. As a result, wear and noise may occur in the local area (contact surface) of the sliding bearing 20. To prevent this, it is necessary to secure the tolerances of pins and sliding bearings even in the harsh environment of construction equipment.

In order to secure the tolerance between the pin 100 and the sliding bearing 20, one side of the inner peripheral surface of the sliding bearing 20 needs to be tapered.

In order to taper one side of the inner peripheral surface of a sliding bearing, it is necessary to taper one side of the outer peripheral surface of the sliding bearing. Below, this will be explained in detail.

Referring again to FIG. 2, the sliding bearing in construction machinery (for example, an excavator) is used in a state in which it is press-fitted into the connection part of the housing, and in the press-fitted state, the outer diameter and inner diameter (d) of the sliding bearing are clamped (S). It changes depending on

Specifically, when the sliding bearing is press-fitted into the connection part of the housing, the shape of the thickness (th, TH) of the sliding bearing changes due to the clamping force. In other words, the shape (profile) of the inner peripheral surface of the sliding bearing changes. This is shown in Figure 5.

Figure 5 is a diagram showing that when the sliding bearing is press-fitted into the housing, the shape of the inner peripheral surface of the sliding bearing changes due to the clamping force.

Referring to FIG. 5, FIG. 5 is a view showing before and after the sliding bearing is press-fitted into the housing. When the sliding bearing is press-fitted into the housing, the shape of the thickness (TH) of the sliding bearing changes, and accordingly, the sliding It indicates that the shape of the inner peripheral surface of the bearing changes.

Referring again to FIG. 5, the sliding bearing in FIG. 5 has a tapered portion 210 formed only on one side of the outer peripheral surface, and no tapered portion is formed on the inner peripheral surface. When a sliding bearing with a tapered portion 210 formed on only one side of the outer peripheral surface is press-fitted into a housing, the shape of the thickness (TH) of the sliding bearing changes, and the shape of the inner peripheral surface of the sliding bearing changes accordingly, so that one side of the inner peripheral surface of the sliding bearing A tapered portion 220 is formed.

That is, the sliding bearing in which the tapered portion 210 is formed on one outer peripheral surface of the sliding bearing is press-fitted into the connection part of the housing, and the inner peripheral surface of one side of the sliding bearing is also tapered due to the clamping force and/or clamping amount (S). Part 220 is formed.

Figure 6 is a diagram showing the change in surface pressure (local surface pressure in the sliding bearing) that appears on one side of the sliding bearing due to bending of the pin when there is or is not a tapered portion on one side of the outer peripheral surface of the sliding bearing.

Referring to FIG. 6, a tapered portion 210 is formed on one side of the outer peripheral surface of the sliding bearing 200, and when the sliding bearing 200 is press-fitted into the connection portion of the housing, a tapered portion 210 is formed on one side of the inner peripheral surface of the sliding bearing 200. When the tapered portion 220 is formed and a high load is applied to the housing in this state and bending occurs in the pin 100, the local surface pressure in the sliding bearing 200 is on one side of the outer peripheral surface of the sliding bearing 200. Compared to the case without the tapered part, it shows a significant decrease.

To summarize, when the sliding bearing 200, which has a tapered portion 210 formed on one outer peripheral surface, is press-fitted (press-fitted) into the connection part of the housing, the sliding bearing 200 is compressed by the clamping force and/or the clamping amount (S). A tapered portion 220 is also formed on one inner peripheral surface. When the tapered portion 210 is formed on one side of the inner peripheral surface of the sliding bearing 200, the tolerance between the pin 100 and the sliding bearing 200 can be additionally secured. When the tolerance between the pin 100 and the sliding bearing 200 is additionally secured, even if bending occurs in the pin 100, the contact surface between the sliding bearing 200 and the pin 100 disposed within the sliding bearing 200 '(This is referred to as 'the contact surface between the pin 100 and the sliding bearing 200') increases, and the surface pressure on one side of the sliding bearing 200 decreases.

Figure 7 is a diagram showing a sliding bearing according to an embodiment of the present invention. Figure 7 (a) shows a portion of the cross section of the sliding bearing 200 according to an embodiment of the present invention, and a tapered portion 210 is formed on one side of the outer peripheral surface of the sliding bearing 200. Figure 7 (b) shows a case where a pin 100 is disposed inside the sliding bearing 200 of (a) and bending occurs in the pin 100. The grooves formed on the inner peripheral surface of the sliding bearing 200 shown in FIG. 7 are dimples and/or pockets.

Comparing FIG. 7(b) with the above-mentioned FIG. 4(b), FIG. 4(b) shows that the pin 100 invades and pressurizes a local area of the inner peripheral surface of the sliding bearing 20, and FIG. (b) in 7 indicates that the contact surface between the pin 100 and the sliding bearing 200 is maximized, so that the pin 100 does not invade the local area of the inner peripheral surface of the sliding bearing 200.

Referring again to Figure 7 (b) and Figure 6, when the sliding bearing 200 with the tapered portion 210 formed on one side of the outer peripheral surface is pressed into the connection part of the housing, one side of the inner peripheral surface of the sliding bearing 200 is tapered. The portion 220 is formed, and in this state, even if a high load is applied to the housing and bending occurs in the pin 100, the local surface pressure in the sliding bearing 200 is different from the case where there is no tapered portion on one side of the outer peripheral surface of the sliding bearing. In comparison, it can be seen that there is a significant decrease.

By forming one side of the inner peripheral surface of the sliding bearing 200 to be tapered (220), the tolerance between the pin 100 and the sliding bearing 200 can be secured.

Securing the tolerance between the pin 100 and the sliding bearing 200 increases the contact surface between the pin 100 and the sliding bearing 200 as much as possible when the bending of the pin 100 exceeds a certain level.

Accordingly, in the harsh environment of construction machinery, the local surface pressure in the sliding bearing 200 is significantly reduced, thereby reducing wear and joints that may occur in the local area of the sliding bearing 200.

As such, in order to reduce wear and friction of the sliding bearing 200, it is desirable to form a tapered portion 220 on one side of the inner peripheral surface of the sliding bearing 200.

However, since dimples and/or pockets are formed (processed) on the inner peripheral surface of the sliding bearing 200, it is difficult to additionally form a tapered portion with a normal shape on the inner peripheral surface of the sliding bearing 200.

In addition, when a tapered portion is formed on the inner peripheral surface of the sliding bearing 200, the dimples and/or pockets are damaged in the portion where the tapered portion is formed, thereby increasing the amount of heat generated in the corresponding portion and seizing is likely to occur, resulting in rapid accelerated wear. As a result, the lifespan of the sliding bearing 200 is shortened.

According to the above, a tapered portion is formed (processed) on one side of the sliding bearing 200 in contact with the pin 100 by bending the pin 100, but on the outer peripheral surface instead of the inner peripheral surface of the sliding bearing 200, which is difficult to process. By forming (processing) the tapered portion 210, the tapered portion 220 can be formed on one side of the inner peripheral surface of the sliding bearing 200.

The sliding bearing according to an embodiment of the present invention can minimize wear and noise on one side of the sliding bearing even when the bending of the pin exceeds a certain level under conditions of excessive load application in the housing.

This is done by changing the design of the outer peripheral surface of one side of the sliding bearing 200, so that when the bending of the pin 100 exceeds a certain level, the contact surface between the pin 100 and the sliding bearing 200 is maximized to increase the sliding bearing. This is possible by minimizing the local surface pressure occurring on the inner peripheral surface of (200).

A change in the design of one outer peripheral surface of the sliding bearing 200 refers to tapering one side (a certain portion) of the outer peripheral surface of the sliding bearing 200.

Therefore, referring to FIGS. 5 and 7 , the sliding bearing 200 according to an embodiment of the present invention includes a tapered portion 210 in which one side of the sliding bearing 200 is tapered.

The tapered portion 210 is formed on one outer peripheral surface of the sliding bearing 200.

The sliding bearing 200 is cylindrical and tubular, and when the sliding bearing 200 is arranged horizontally, the horizontal direction of the sliding bearing 200 can be defined as the longitudinal direction of the sliding bearing 200. Based on the longitudinal direction of the sliding bearing 200, one side and the other side of the sliding bearing 200 point to opposite positions.

The tapered portion 210 is formed on one side of the sliding bearing 200. The tapered portion 210 is formed uniformly along the outer peripheral surface of the sliding bearing 200.

In the sliding bearing 200, the tapered portion 210 may be formed on one outer peripheral surface of the sliding bearing 200, where local surface pressure is generated on one side of the sliding bearing 200 by bending the pin 100.

The tapered portion 210 is formed to have a predetermined length TL1.

The tapered portion 210 is formed to slope downward at a predetermined angle in the longitudinal direction of the sliding bearing 200 toward the outside of the sliding bearing 200.

That is, the tapered portion 210 is formed so that the thickness (TH) of the sliding bearing 200 decreases as it goes outward in the longitudinal direction of the sliding bearing 200, and the tapered portion at the end of the sliding bearing 200 has a maximum depth (TD1). has

The length (TL1) and maximum depth (TD1) of the tapered portion 210 to be formed on one outer peripheral surface of the sliding bearing 200 are the length (TL2) of the tapered portion 220 to be formed on one inner peripheral surface of the sliding bearing 200. It can be obtained from and maximum depth (TD2).

Figure 8 is a table showing the surface pressure results according to the length of the tapered part when applying the tapered part to the inner peripheral surface of the sliding bearing, and Figure 9 is a simulation of the tapered part application section according to the table in Figure 8 and the surface pressure results in the application section. This is a drawing shown as . The grooves formed on the inner peripheral surface of the sliding bearing 200 shown in FIG. 9 are dimples and/or pockets.

Referring to Figures 8 and 9, depending on the application section of the inner peripheral surface tapered portion 220 of the sliding bearing 200 (12.5% / 25% / 37.5% / 50% section compared to the overall length of the sliding bearing 200) As a result of comparing the maximum surface pressure, the lowest surface pressure result was obtained when the length (TL2) of the inner peripheral surface tapered portion 220 of the sliding bearing 200 was 25% (=1/4) compared to the overall length of the sliding bearing 200. indicates. Here, the application section of the tapered portion 220 on the inner peripheral surface of the sliding bearing 200 represents the length TL2 of the tapered portion 220 formed on the inner peripheral surface of the sliding bearing 200. And, the overall length of the sliding bearing 200 represents the total length of the sliding bearing 200 in the longitudinal direction. The maximum surface pressure results compared to the overall length of the sliding bearing 200 in Figures 8 and 9 show when the maximum depth (TD2) of the tapered portion 220 formed on the inner peripheral surface of the sliding bearing 200 is 0.25 mm. .

When the length (TL2) of the tapered portion 220 on the inner peripheral surface of the sliding bearing 200 is 25% (=1/4) of the overall length of the sliding bearing 200, it is similar to a conventional sliding bearing without a tapered portion on the inner peripheral surface. In comparison, the maximum surface pressure was reduced by more than 40%.

Referring again to FIGS. 8 and 9, the length TL2 of the inner peripheral surface tapered portion 220 of the sliding bearing 200 is suitably 25% to 37.5% of the overall length of the sliding bearing 200.

Figure 10 is a diagram showing the relationship between the pin bending angle and the taper angle on the inner peripheral surface of the sliding bearing for calculating the maximum depth of the tapered portion of the inner peripheral surface of the sliding bearing.

Referring to FIG. 10, through numerical analysis, the bending angle of the pin 100 can be calculated when the maximum load is applied, and when the contact area between the pin 100 and the sliding bearing 200 is maximum. can be calculated. And, when the contact area between the pin 100 and the sliding bearing 200 is maximum, the maximum depth (TD2) of the tapered portion 220 on the inner peripheral surface of the sliding bearing 200 can be calculated.

When the contact area between the pin 100 and the sliding bearing 200 is maximum, the bending angle of the pin 100 and the taper angle on the inner peripheral surface of the sliding bearing 200 are the same. At this time, if the maximum depth (TD2) of the tapered portion 220 on the inner peripheral surface of the sliding bearing 200 is calculated, this value is greater than 0 (zero) and is less than 0.5% of the thickness (TH) of the sliding bearing 200. . For reference, the maximum surface pressure results compared to the overall length of the sliding bearing 200 in Figures 8 and 9 are when the maximum depth (TD2) of the tapered portion 220 formed on the inner peripheral surface of the sliding bearing 200 is 0.25 mm. It indicates time.

When the sliding bearing 200 is press-fitted into the connection portion of the housing, the tapered portion 220 formed on one inner peripheral surface of the sliding bearing 200 corresponds to the tapered portion 210 formed on one outer peripheral surface of the sliding bearing 200. It can have a shape.

In a state in which the sliding bearing 200 is press-fitted into the connection portion of the housing, the outer diameter and inner diameter of the sliding bearing 200 change depending on the clamping force and/or the clamping amount (S), and the clamping force and/or the clamping amount (S) The amount of change in the outer diameter and inner diameter of the sliding bearing 200 can be calculated using empirical dimensions.

Referring to FIGS. 6 to 10 and Table 1 below, the length TL1 of the outer peripheral surface tapered portion 210 of the sliding bearing 200 is 25% to 37.5% compared to the overall length of the sliding bearing 200. The time is appropriate, and it is equal to the length (TL2) of the tapered portion of the inner peripheral surface of the sliding bearing 200. Table 1 shows the length of the tapered portion in the sliding bearing 200 according to the amount of clamping.

[Table 1]

In addition, through actual press-fit testing and press-fit numerical analysis, the maximum depth (TD1) of the tapered portion 210 formed on one side of the outer peripheral surface of the sliding bearing 200 and the tapered portion formed on one side of the inner peripheral surface of the sliding bearing 200 ( 220), the relational expression for the maximum depth (TD2) can be calculated. The above relational expression is shown in Equation 1 below.

[Equation 1]

TD1 * clamping amount * 1.76 = TD2

In Equation 1, the maximum depth (TD2) of the tapered portion 220 formed on one side of the inner peripheral surface of the sliding bearing 200 is greater than 0 (zero) and less than 0.5% of the thickness (TH) of the sliding bearing 200. am.

As described above, the sliding bearing 200 according to an embodiment of the present invention forms a tapered portion 210 on one side of the outer peripheral surface, thereby preventing the bending of the pin from exceeding a certain level under conditions of excessive load applied to the housing. Even in this case, wear and noise occurring on one side of the sliding bearing 200 can be minimized.

Additionally, the construction machine according to another embodiment of the present invention includes the sliding bearing 200 according to the above-described embodiment of the present invention.

A construction machine according to another embodiment of the present invention includes a frame 30 (see FIG. 1) having a first connection part 31 (see FIG. 1), and a second connection part (see FIG. 1) connected to the first connection part 31. 41) (see FIG. 1), a housing 40 (see FIG. 1), a pin 100 (see FIG. 6) disposed in the first connection part 31 and the second connection part 41, and It is disposed between the pin 100 and the second connection portion 41 and includes a sliding bearing 200 (see FIG. 6) having a tapered portion 210 formed on one side of the outer peripheral surface. The sliding bearing 200 refers to a sliding bearing according to an embodiment of the present invention.

The frame 30, housing 40, pin 100, and sliding bearing 200 that constitute the construction machine according to another embodiment of the present invention are the sliding bearing according to the above-described embodiment of the present invention. It is the same as what was described. Therefore, detailed explanations will be omitted and briefly summarized as follows.

In the construction machine according to another embodiment of the present invention, the tapered portion 210 formed on one side of the outer peripheral surface of the sliding bearing 200 has a predetermined length, and the predetermined length is 25 times greater than the total length of the sliding bearing 200. % ~ 37.5%.

Additionally, when the sliding bearing 200 is press-fitted into the second connection portion 41 of the housing 40, a tapered portion 220 is formed on one side of the inner peripheral surface of the sliding bearing 200.

Additionally, the length of the tapered portion 210 formed on one side of the outer peripheral surface of the sliding bearing 200 is the same as the length of the tapered portion 220 formed on one side of the inner peripheral surface of the sliding bearing 200.

In addition, the tapered portion 220 formed on one side of the inner peripheral surface of the sliding bearing 200 has a maximum depth at the end, and the maximum depth is 0.25 mm.

In addition, the tapered portion 220 formed on one side of the inner peripheral surface of the sliding bearing 200 has a maximum depth (TD2) at the end, and the maximum depth is greater than 0 (zero) and 0.5 of the thickness (TH) of the sliding bearing 200. % or less.

In addition, the maximum depth (TD1) of the tapered portion 210 formed on one side of the outer peripheral surface of the sliding bearing 200 and the maximum depth (TD2) of the tapered portion 220 formed on one side of the inner peripheral surface of the sliding bearing 200 are expressed by the relational equation It is calculated as, and the above relational expression can be expressed as [Equation 1] described above.

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the above description focuses on the embodiment, this is only an example and does not limit the present invention, and those skilled in the art will be able to understand the above without departing from the essential characteristics of the present embodiment. You will see that various modifications and applications not illustrated are possible. In other words, each component specifically shown in the embodiment can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

30: Frame
31: first connection part
40: Housing
41: second connection portion
100: pin
200: sliding bearing
210: Tapered portion formed on one side of the outer peripheral surface of the sliding bearing
220: Tapered portion formed on one side of the inner peripheral surface of the sliding bearing
th, TH: Thickness of sliding bearing
h, H: Through hole of sliding bearing
TL1: Taper length formed on one side of the outer peripheral surface of the sliding bearing
TL2: Taper length formed on one side of the inner peripheral surface of the sliding bearing
TD1: Taper depth formed on one side of the outer peripheral surface of the sliding bearing
TD2: Taper depth formed on one side of the inner peripheral surface of a sliding bearing

Claims (7)

It is a sliding bearing with a tapered portion formed on one side of the outer circumference,
The tapered portion has a predetermined length,
A sliding bearing wherein the predetermined length is 25% to 37.5% of the total length of the sliding bearing. a frame having a first connection;
a housing having a second connection portion connected to the first connection portion;
a pin disposed within the first connection portion and the second connection portion; and
It includes a sliding bearing disposed between the pin and the second connection portion and having a tapered portion formed on one side of the outer peripheral surface,
The tapered portion has a predetermined length,
Construction equipment, wherein the predetermined length is 25% to 37.5% of the total length of the sliding bearing. According to claim 2,
When the sliding bearing is press-fitted into the second connection part, a tapered portion is formed on one side of the inner peripheral surface of the sliding bearing. According to claim 3,
The length of the tapered portion formed on one side of the outer peripheral surface of the sliding bearing is the same as the length of the tapered portion formed on one side of the inner peripheral surface of the sliding bearing. According to claim 3,
A tapered portion formed on one side of the inner peripheral surface of the sliding bearing has a maximum depth at an end, and the maximum depth is greater than 0 and less than 0.5% of the thickness of the sliding bearing. According to claim 3,
The maximum depth (TD1) of the tapered portion formed on one side of the outer circumferential surface of the sliding bearing and the maximum depth (TD2) of the tapered portion formed on one side of the inner circumferential surface of the sliding bearing are calculated by a relationship, and the relationship formula is as follows [Equation 1] Expressed together, construction machinery.
[Equation 1]
TD1 * clamping amount * 1.76 = TD2 According to claim 6,
A tapered portion formed on one side of the inner peripheral surface of the sliding bearing has a maximum depth at an end, and the maximum depth is greater than 0 and less than 0.5% of the thickness of the sliding bearing.