JP3506931B2 - Crawler lower rollers for civil engineering and construction machinery - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower crawler roller for civil engineering / construction machines equipped in construction machines such as hydraulic excavators and cranes, and more particularly, by joining two roller members formed separately. The present invention relates to a lower roller for a crawler track of a manufactured civil engineering / construction machine.

[0002]

2. Description of the Related Art FIGS. 6 to 8 are explanatory views of the prior art.
6 is a cross-sectional view showing a conventional crawler belt lower roller for civil engineering / construction machinery, FIG. 7 is an enlarged cross-sectional view of an essential part of the conventional crawler belt lower roller shown in FIG. 6, and FIG. 8 is a conventional crawler belt lower roller shown in FIG. It is a figure which shows the state at the time of manufacture of.

This type of crawler belt lower roller is arranged, for example, in a traveling body portion of a hydraulic excavator. Figure 6
As shown in FIG. 2, the lower roller 31 for the crawler belt formed by integrally joining two roller members 31a and 31b, for example, by friction welding.
Is rotatably mounted on a predetermined axle or shaft 33 via a bearing 32 fitted in the lower crawler belt roller 31. There is an oil reservoir chamber 37 in which lubricating oil that lubricates the gap between the bearing 32 and the shaft 33 is stored, and a sliding contact surface 51 that slidably contacts a track link (not shown) that forms a part of the crawler belt is formed on the outer peripheral portion. Have The shaft 33 described above is fixed to a collar 35 by a stop pin 34, and the collar 35 is fixed to a track frame (not shown). In addition, a floating seal 38 that suppresses leakage of lubricating oil is attached to a sliding contact portion between the collar 35 and the lower crawler belt roller 31.

Due to the frictional pressure contact of the roller members 31a and 31b described above, as shown in FIG. 7, a pair of inner curls 41 having a winding shape projecting in mutually opposite directions are provided on the inner peripheral side where the oil sump chamber 37 is located. Has been formed. In addition, a pair of curled outer curls 40 projecting in opposite directions are also formed on the outer peripheral portion. Note that FIG.
Reference symbol E denotes the throat thickness, which affects the strength of the lower crawler belt roller 31.

The above-mentioned crawler belt lower roller 31 is manufactured as follows. That is, as shown in FIG. 8, a roller member 31a having an outer chamfered portion 52 on the outer peripheral side edge portion and an inner chamfered portion 53 on the inner peripheral side edge portion of the end portions located on the side where they are frictionally pressed against each other. One of the rollers 31b, for example, the roller member 31a is attached to a rotating member of a friction welding machine (not shown). In this state, as shown by an arrow 44, the rotating member is rotated at a predetermined high speed while pressing the end portion of the other roller member 31b against the end portion of the roller member 31a with a predetermined friction pressure. When the end portions of the roller members 31a and 31b are fused with each other and appropriately joined, a large upset pressure which is several times the friction pressure is applied in the direction of arrow 44.
The heat treatment temperature after pressure welding is maintained at about 1000 ° C. Thus, the crawler belt lower roller 31 in which the two roller members 31a and 31b are integrated is obtained.

After that, machining is carried out to adjust the overall size or shape, and foreign matters such as scales and cutting chips produced by this machining are removed by blowing air. The lower crawler belt roller 31 thus obtained is mounted on, for example, the traveling body portion of the hydraulic excavator as shown in FIG.

In the prior art, the roller member 3
The chamfer width t0 of the outer chamfered portion 52 and the chamfer width T0 of the inner chamfered portion 53 at the respective ends of 1a and 31b are set to the same value. As a result, the pair of outer curls 40 and the pair of inner curls 41 described above are formed. The outer curl 40 and the inner curl 41 have the same size.

A reference example of a crawler belt lower roller formed by joining and integrating two divided roller members is disclosed, for example, in Japanese Unexamined Patent Publication No. 8-230730.

[0009]

The above-mentioned outer curl 4
The inner curl 41 and the inner curl 41 are inevitably formed during friction welding, and generally, the lower crawler roller 31.
Exists without being removed after the production of Among the outer curl 40 and the inner curl 41, the inner curl 41 has a problem in the related art.

That is, since the conventional inner curl 41 has a large entrainment amount equivalent to that of the outer curl 40, as shown in FIG. The foreign matter 42 of FIG. 6 tends to enter the inside of the inner curl 41, that is, to enter, and to be incorporated as it is as shown in FIG.

When the hydraulic excavator is operated with the foreign matter 42 held in the inner curl 41 in this manner, the foreign matter 42 held in the inner curl 41 is transferred to the lower crawler roller 31 due to, for example, vibration during traveling. There is a problem that the oil scatters in the oil sump chamber 37 and is mixed with the lubricating oil. When such a problem occurs, the lubricating oil mixed with the foreign matter 42 is supplied between the bearing 32 and the shaft 33 shown in FIG. 6, the lubricating performance deteriorates, and the lower crawler roller 31 rolls. It will cause malfunction.

The present invention has been made in view of the above-mentioned conventional state of the art, and an object thereof is a crawler belt for civil engineering / construction machinery capable of suppressing the entry of foreign matter such as scale and cutting chips into the inner curl. The purpose is to provide a lower roller.

[0013]

In order to achieve the above object, the invention according to claim 1 of the present invention is manufactured by friction-welding two roller members, and is rolled onto a predetermined shaft through a bearing. It is movably mounted, has an oil storage chamber for storing lubricating oil inside, and has a sliding contact surface for sliding contact with a track link forming a crawler track on the outer peripheral portion, and by the friction pressure contact of the two roller members, A pair of curled inner curls that are formed on the inner peripheral side where the oil sump chamber is located and project in opposite directions, and a pair of curled outer curls that are formed in the outer peripheral portion and project in opposite directions are provided. The lower crawler belt roller of the civil engineering and construction machine provided is configured such that at least one of the pair of inner curls has a shape smaller than that of the outer curl.

In the invention according to claim 1 having such a structure, when the shape of the outer curl is set to be equal to that of the conventional one, the shape of the inner curl becomes smaller than that of the conventional one, and accordingly foreign matter intrudes. The space basically becomes smaller,
The amount of the foreign matter entering can be reduced.

According to a second aspect of the present invention, in the invention according to the first aspect, each of the two roller members is provided at an outer peripheral edge portion of an end portion located on a side in which the two roller members are frictionally pressed against each other. The outer chamfer is provided with an inner chamfer at the inner peripheral edge, and the chamfer width of the inner chamfer is set larger than the chamfer width of the outer chamfer.

In the invention according to claim 2 having such a configuration, the chamfering width of the inner chamfered portion formed on the inner peripheral side edge portion is set to be large, so that the amount of the member on the inner peripheral side edge portion is reduced, A small-shaped inner curl can be easily obtained during friction welding.

The invention according to claim 3 of the present invention is
Manufactured by friction welding two roller members,
It is rotatably mounted on a predetermined shaft via a bearing, has an oil reservoir chamber for storing lubricating oil therein, and has a sliding contact surface for sliding contact with a track link forming a crawler belt on an outer peripheral portion thereof. Due to the frictional pressure contact of the two roller members, a pair of inner curls that are formed on the inner peripheral side where the oil sump chamber is located and project in opposite directions, and a pair of inner curls that are formed in the outer peripheral part and project in opposite directions. In a lower crawler belt roller of a civil engineering and construction machine having a pair of winding-shaped outer curls, at least one roller member of the two roller members when the lower crawler roller section is taken in the axial direction. of a first straight line drawn by the roller in the peripheral surface, with the tangent of the corresponding inner roller of the inner car le destination end portion projecting toward the side of the roller member circumferential surface
An angle formed by a certain second straight line is α, and the angle α is set to 0 degrees or more.

[0018] According to the invention of claim 3 constructed as described above, a first straight line drawn by the roller in the peripheral surface, and a second straight line which is tangent roller inner peripheral surface of the inner car le destination end portion Are parallel to each other or are in a slightly open state, whereby foreign matter such as scales and cutting chips can be prevented from entering. Further, even if a foreign matter enters, it can be easily removed by blowing air blow performed after machining.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a crawler belt lower roller for civil engineering and construction machines according to the present invention will be described below with reference to the drawings. 1 to 4 are explanatory views of an embodiment corresponding to the inventions according to claims 1 and 2 of the present invention, and FIG. 1 is a view showing a state in which the embodiment of the present invention is mounted on a shaft, FIG. 1 is a view seen from the direction A in FIG. 1, FIG. 3 is an enlarged cross-sectional view showing a main part of one embodiment shown in FIG. 1, and FIG. 4 is a view showing a state at the time of manufacturing one embodiment shown in FIG. .

FIG. 1 corresponds to FIG. 6 described above, and shows, for example, a state in which the crawler belt lower roller 1 of the present embodiment is arranged in the traveling body portion of the hydraulic excavator. In this embodiment,
Except for the inner curl 11 part, for example, the configuration is similar to that shown in FIG. First, a portion equivalent to that shown in FIG. 6 will be described.

The crawler belt lower roller 1 of this embodiment is shown in FIG.
As shown in FIG. 2, the two roller members 1a and 1b are integrally friction-welded to each other, and are rotatably mounted on a predetermined shaft 3 via a bearing 2 fitted in the lower crawler roller 1. Has been done. A sliding surface 2 that has an oil sump chamber 7 in which a lubricating oil that lubricates the gap between the bearing 2 and the shaft 3 is stored, and slides on a track link 9 that forms a part of the crawler belt on the outer peripheral portion.
Have one. The shaft 3 described above is fixed to the collar 5 by the stop pin 4, and the collar 5 is fixed to the track frame 6. Further, a floating seal 8 that suppresses leakage of lubricating oil is attached to the sliding contact portion between the collar 5 and the crawler belt lower roller 1.

Further, as shown in FIG. 3, frictional pressure contact between the roller members 1a and 1b during the manufacture of the crawler belt lower roller 1 causes the oil sump chamber 7 to be located in the inner peripheral side in opposite directions to each other. A pair of the above-described inner curls 11 having a winding shape that projects is formed, and a pair of outer curls 10 that have a winding shape that project in mutually opposite directions are also formed on the outer peripheral portion.

In the present embodiment, the shape of each of the pair of outer curls 10 is, for example, the same as that of the conventional outer curl shown in FIG. 6, but the shape of each of the pair of inner curls 11 is different. Is smaller than the shape of the outer curl 10. The throat thickness E shown in FIG.
0 affects the strength of the lower crawler belt roller 1, but in the present embodiment, the throat thickness E0 is set to be substantially the same as the throat thickness E in the conventional technique shown in FIG. There is.

The above-mentioned lower crawler belt roller 1 is manufactured as follows. That is, as shown in FIG. 4, the roller member 1a having the outer chamfered portion 22 on the outer peripheral side edge portion and the inner chamfered portion 23 on the inner peripheral side edge portion of the ends located on the side where they are frictionally pressed against each other. One of the rollers 1b, for example, the roller member 1a, is mounted on a rotary member of a friction welding machine not shown. The chamfer width T of the inner chamfer 23 is set to be four times as large as the chamfer width t of the outer chamfer 22 of each of the roller members 1a and 1b. The chamfer width t of the outer chamfered portion 22 is set to, for example, the same size as a conventional one.

In this state, as shown by the arrow 13, the end portion of the other roller member 1b is, for example, 30 to 50 kgf / cm.
While pressing the end of the roller member 1a with the friction pressure of ² ,
A rotating member (not shown) is rotated at a rotation speed of 1300 rpm, for example.

With the end portions of the roller members 1a and 1b appropriately fused and joined, a large upset pressure, for example, 170 to 190 kgf / cm ² upset pressure is finally applied in the direction of arrow 13. The heat treatment temperature after the pressure contact is maintained at, for example, 1000 to 1100 ° C. This gives 2
The two roller members 1a and 1b are integrated to obtain the crawler belt lower roller 1 of the present embodiment shown in FIGS.

After that, mechanical processing for adjusting the overall size or the overall shape is performed, and foreign matters such as scales and cutting chips attached to the lower crawler belt roller 1 formed by this mechanical processing are air-processed. It is removed by blowing a blow. The crawler belt lower roller 1 thus obtained is attached to, for example, a traveling body portion of a hydraulic excavator as shown in FIG.

According to the crawler belt lower roller 1 of the present embodiment thus constructed, the shape of the inner curl 11 is made smaller than the shape of the outer curl 10 which is substantially the same as the conventional one. The space for entering foreign matter such as powder is basically reduced, and the amount of foreign matter entering can be reduced. As a result, for example, even if vibration is received during traveling, the foreign matter scattered from the inner curl member 41 into the oil sump chamber 7 is extremely small or completely eliminated, so that the lubricating oil can be kept clean and therefore highly accurate lubrication can be achieved. The performance can be maintained for a long period of time, and rolling failure of the lower crawler belt roller 1 due to the lubricating oil mixed with foreign matter can be suppressed.

Further, the chamfer width T of the inner chamfered portion 23 formed on the inner peripheral side edge portion is set to be four times as large as the outer chamfered portion t formed on the outer peripheral side edge portion. The amount of the member is reduced, and the inner curl 11 having a small shape can be easily obtained at the time of friction welding.

In the above embodiment, the roller member 1
Although the shape of both of the pair of inner curls 11 formed corresponding to each of a and 1b is smaller than that of the outer curl 10, the present invention is not limited to this, and the inside of the roller members 1a and 1b is not limited to this. Only one of the curls 11 may be configured to be smaller than the outer curl 10, and the other may be configured to have the same size as the outer curl 10.

With this structure, the effect is halved compared to the above-mentioned embodiment, but it is possible to suppress the entry of foreign matter into the inner curl 11 as compared with the prior art.

FIG. 5 is an enlarged cross-sectional view of an essential part showing another embodiment corresponding to the invention according to claim 3 of the present invention. In another embodiment shown in FIG. 5, when the lower crawler belt roller 1 is sectioned in the axial direction, the first straight line 16 drawn by the inner circumferential surface of the roller member 1b and the roller member 1b side. headed an angle α between the second straight line 17 which is tangent to the roller in the peripheral surface inside the curl 15-edge portion of the roller member 1b which protrudes is set larger than 0 degrees.

The relationship between the inner peripheral surface of the roller member 1a and the inner curl 15 whose tip extends in the direction of the roller member 1a is set in the same manner.

The inner curl 15 having the above-described shape can be obtained by setting, for example, the friction pressure in the manufacturing conditions to be smaller by about 10 kg / cm ² than in the case of the embodiment shown in FIGS. it can. In addition, in this other embodiment, since the inner curl 15 has a slightly rising shape,
The throat thickness F can be made larger than that of the embodiment E0 shown in FIGS. 1 to 4 described above. Other configurations are the same as, for example, the embodiments shown in FIGS. 1 to 4 described above.

In another embodiment configured in this way,
For example, regarding the roller member 1b side, the first straight line 16 drawn by the inner peripheral surface of the roller of the roller member 1b.
When, in the tangent of the roller in the peripheral surface of the inner curl 15-edge portion
A is slightly opened state between one second straight 17. The same applies to the roller member 1a side.

With these, it is possible to prevent foreign matter such as scales and cutting chips from entering. Further, even if a foreign matter enters, it can be easily removed by blowing air blow performed after machining. As a result, similar to the above-described embodiment shown in FIGS. 1 to 4, for example, the lubricating oil can be kept clean even when subjected to vibration during traveling, high-precision lubricating performance can be maintained for a long time, and the lubricating oil containing foreign matter It is possible to suppress rolling failure of the lower crawler belt roller 1 due to the above.

Further, since the throat thickness F increases, the strength of the crawler belt lower roller 1 can be improved.

In the above-described another embodiment shown in FIG. 5, both the inner curls 15 on the roller members 1a and 1b side are formed so as to open, but only one of them is configured to open. Good. The structure thus configured is shown in FIG.
Although the effect is halved as compared with the other embodiment shown in (1), it is possible to suppress the entry of foreign matter as compared with the prior art.

In another embodiment shown in FIG. 5, the angle α formed by the first straight line 16 and the second straight line 17 is 0.
Although it is set larger than 0 degree, it is almost 0 degree, that is, the first
The straight line 16 and the second straight line 17 may be set to be substantially parallel to each other. Even with such a configuration, it is possible to obtain substantially the same operational effects as those of the other embodiments described above.

[0040]

As described above, the claims 1 and 2 of the present invention are as follows.
According to the invention according to 2, the scale to the inner curl member,
It is possible to suppress the entry of foreign matter such as chips and the like, so that the lubricating oil can be kept clean, high-precision lubrication performance can be maintained for a long period of time, and rolling defects caused by lubricating oil containing foreign matter can be prevented. Can be reduced compared to.

According to the third aspect of the invention, it is possible to prevent foreign matter such as scales and cutting chips from entering, and even if foreign matter enters, it can be easily removed by blowing air. Therefore, the lubricating oil can be kept clean, high-precision lubricating performance can be maintained for a long time, and rolling defects due to the lubricating oil mixed with foreign matter can be reduced as compared with the conventional case. Further, since the throat thickness can be set larger than the conventional one, the strength of the crawler belt lower roller can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which an embodiment of a crawler belt lower roller of a civil engineering / construction machine of the present invention is mounted on a shaft.

FIG. 2 is a view seen from the direction A in FIG.

FIG. 3 is an enlarged cross-sectional view showing a main part of the embodiment shown in FIG.

FIG. 4 is a diagram showing a state during manufacturing of the embodiment shown in FIG.

FIG. 5 is an enlarged sectional view of an essential part showing another embodiment of the present invention.

FIG. 6 is a sectional view showing a crawler belt lower roller of a conventional civil engineering / construction machine.

FIG. 7 is an enlarged cross-sectional view of a main part of the conventional lower roller for crawler belt shown in FIG.

FIG. 8 is a diagram showing a state at the time of manufacturing the conventional lower roller for crawler belt shown in FIG.

[Explanation of symbols]

1 Lower roller for track 1a Roller member 1b Roller member 2 bearings 3 axes 7 oil sump room 9 track links 10 outer curl 11 inner curl 14 outer curls 15 inner curl 16 First straight line 17 Second straight line 21 Sliding surface 22 External chamfer 23 Inner chamfer t chamfer width T chamfer width E0 Throat F Throat

Continuation of the front page (56) Reference JP-A-8-230730 (JP, A) JP-A-9-286358 (JP, A) JP-A-10-7039 (JP, A) SAIKAI Sho 59-174972 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 55/14 F16C 13/00

Claims (3)

(57) [Claims] 1. A roller bearing, which is manufactured by friction-welding two roller members, is rotatably mounted on a predetermined shaft through a bearing, has an oil reservoir chamber for storing lubricating oil, and has an outer peripheral portion on an outer peripheral portion thereof. It has a sliding contact surface that slides in contact with a track link that forms a crawler belt, and has a winding shape that is formed on the inner peripheral side where the oil sump chamber is located by the friction pressure contact of the two roller members and projects in opposite directions. A lower crawler roller for a civil engineering and construction machine, comprising a pair of inner curls and a pair of outer curls formed in the outer peripheral portion and projecting in mutually opposite directions, wherein at least one of the pair of inner curls is used. The lower roller for crawler belts of civil engineering and construction machines is characterized in that the shape of is set smaller than the shape of the outer curl. 2. Each of the two roller members is provided with an outer chamfered portion at an outer peripheral side edge portion of an end portion located on a side to be frictionally pressed against each other, and an inner chamfered portion at an inner peripheral side edge portion, and The chamfer width of the inner chamfer is set larger than the chamfer width of the outer chamfer.
Lower roller for the crawler track of the described civil engineering and construction machinery. 3. A roller bearing, which is manufactured by friction-welding two roller members, is rotatably mounted on a predetermined shaft via a bearing, has an oil reservoir chamber for storing lubricating oil therein, and has an outer peripheral portion. It has a sliding contact surface that slides in contact with a track link that forms a crawler belt, and has a winding shape that is formed on the inner peripheral side where the oil sump chamber is located by the friction pressure contact of the two roller members and projects in opposite directions. A lower crawler roller for a civil engineering / construction machine, comprising a pair of inner curls and a pair of outer curls formed on the outer peripheral portion and projecting in mutually opposite directions, in the axial direction of the lower crawler roller. When cross-sectioned, above 2
One of the first and the straight line drawn by the roller in the peripheral surface of at least one roller member of the roller member, the roller in the peripheral surface of the inner car le destination end portion projecting toward the side of the relevant roller member A lower roller for a crawler track for civil engineering and construction machinery, wherein the angle formed by the tangent second straight line is α, and the angle α is set to 0 degrees or more.