JP2001010551A - Fixed structure of track and track link and pin - Google Patents

Abstract

(57) [Summary] [Problem] To provide a mechanical fixing structure fixing that can secure a secure fixing with a simple mechanism after press-fitting and fixing a link and a pin. A left and right pair of links (6, 7) are connected to pins (5).
In the running track (1) of the vehicle connected endlessly through the bush (4) and the pin (5) into the pin press-in hole (32) of the link (6, 7), the pin center ( O ₁ ), at least the center of rotation (O ₄ ) of the pin fixing member (41) and, in some cases, the center of the circumferential groove (O ₃ ) of the pin (5) are deviated, so that the fixing member (41) Is rotated along the inner peripheral surface of the concave portion (33) formed on one side surface of the pin circumferential groove (40), and a part of the peripheral edge of the pin insertion hole (42) of the pin fixing member (41) is rotated. Into the circumferential groove (40). This fitting amount can be adjusted by the rotation angle of the pin fixing member (41).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a link and a pin of a crawler track for use in a crawler type vehicle. The present invention relates to a simple link and pin fixing structure that ensures secure fixing.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a track chain 1 used for a track type vehicle in a construction machine such as a bulldozer or a tractor has a plurality of endless link chains 3 for ground contact. It is attached by bolting.
The link chain 3 sequentially press-fits, for example, a cylindrical bush 4 and connecting pins 5 inserted into the bush 4 with both ends exposed to the respective pin insertion holes of the pair of left and right links 6 and 7. By assembling, each link 6,
The front and rear ends of the links 6 and 7 are articulated via the front and rear pins 5 in a state in which the links 7 are separated from each other.

In order to prevent internal wear between the pin 5 and the bush 4, each end of the links 6 and 7 is provided with a lubricating oil-tight seal member (not shown) and a seal for preventing the seal member from collapsing. A spacer is provided, and lubricating oil stored inside the pin 5 is supplied between the pin 5 and the bush 4.

The link chain 3 is generally used for traveling on the ground such as earth and sand, gravel, crushed stone, etc., the soft ground and the steep slope. It is easy to receive external force in the thrust direction applied to the end face of the pin 5 due to external force in the thrust direction applied to 6, 6 and the roller body of the vehicle body. Therefore, the pin 5 is connected to the link 6 by the external force.
7 so as not to move in the thrust direction relative to
It is necessary to press-fit and fix each pin 5 and the links 6 and 7 firmly. If the pressure input is small or if the pin 5 receives an external force for a long period of time, a pin shift or a pin dropout occurs. Therefore, the lubricating oil-sealing seal member provided at the end of each of the links 6 and 7 and Deformation, displacement, breakage, etc. occur in the crush prevention spacer of the seal member.

If the seal member or the spacer for preventing the seal member from being crushed is damaged, etc., the lubricating oil is greatly consumed, causing internal wear between the pin 5 and the bush 4 to cause the pin 5 and the bush 4 to wear. There is a problem that the damage of the bush 4 or the like is rapidly caused, and the function as the link chain 3 is lost.

On the other hand, in this type of crawler belt, for example, a portion of the inner circumferential surface of the bush 4 in the forward direction is easily worn locally, and the pin ends are pressed into the links 6 and 7 in accordance with the wear. The pin 5 may be extracted from the links 6 and 7 to change the position in the circumferential direction. When removing this pin
If the press-in force between the pin and the links 6 and 7 is high, a scratch mark is left on the pin surface, and extra time is spent to adjust this.
Therefore, the pressure input is set lower than usual, and the pin 5 and the links 6 and 7 are press-fitted and fixed, and a mechanical retaining structure of the pin 5 is adopted.

As this retaining structure, for example, a retaining ring type as shown in FIG. 8 and a pin retaining structure disclosed in JP-A-5-213237 have been developed.
In the former, an annular groove 8 is formed on the protruding end peripheral surface of the pin 5 press-fitted into the pin press-fitting hole of the link 6, and a C-shaped retaining member fitted into the annular groove 8 is attached to each link 6. , 7 are fixed to the links 6 and 7 and the pin 5 in contact with the peripheral edge of the pin press-in hole. In the latter case, as shown in FIG. After the arc-shaped annular groove 8 is formed and the pin 5 is press-fitted into the pin press-fitting hole of the link 6, 7, a part of the outer periphery of the boss of each link 6, 7 is pressed and deformed by the punch device 9 aligned in the radial direction. Thus, a small lump is projected into the annular groove 8, and the lump is engaged with the annular groove 8. In these figures, reference numeral 10 denotes a lubricating oil hermetic seal member, and reference numeral 11 denotes a crush prevention spacer of the seal member.

[0008]

According to the pin retaining structure shown in FIG. 8, the C-shaped engaging member fitted in the annular groove 8 has elasticity. It is easy to elastically deform from the locked state due to contact of foreign matter or vibration of the crawler belt. The crawler-type vehicle is used in an environment with a lot of rocks and irregularities around the feet, and the C-shaped locking member is in contact with the fixed end faces of the flat links 6 and 7 and is exposed to the outside. It is easily affected by external impact. Furthermore, even when the C-shaped locking member itself is fixed, it cannot be locked on the entire circumference of the annular groove 8 because the shape is C-shaped, and the external force received by the locking member is not so large. Due to its elastic deformation, it may be shifted or detached from the annular groove 8.

When the C-shaped locking member is fitted and locked in the annular groove, the fixed end faces of the links 6 and 7 are flat. Are forced to protrude outward, so that the chances of directly contacting an external obstacle or receiving an impact from the obstacle increase.
This also promotes the relative displacement in the axial direction from the above.

On the other hand, according to the disclosure of Japanese Patent Laid-Open No. Hei 5-213237, a small lump is projected from the thin outer periphery of the boss toward the annular groove 8 by local punching. For this reason, the number of engagement portions with the pin 5 is small, and the width and thickness of the engagement portion are small. Therefore, the pin 5 cannot be firmly fixed in the axial direction, and the durability is poor.

In the fixing structure of the bosses formed by punching, it is impossible to visually check the annular grooves 8 of the pins 5 press-fitted into the bosses of the links 6 and 7. It is difficult to accurately project the small mass in the locked state, and the small mass is surely engaged in the annular groove 8 not only in the assembling work of the links 6, 7 and the pin 5 but also in the inspection after the assembling operation. There is also a problem that it cannot be determined whether or not they match. Furthermore, since the boss protrudes from the side surfaces of the links 6 and 7, the boss portion easily interferes with an external obstacle, rocks, and the like, and it is easy to promote rattling.

Furthermore, in addition to the link press machine used for assembling the pins 5 and the links 6 and 7, a dedicated punching device is required, and the installation location is limited to the vicinity of the boss. Must be set to a large value, and in addition to the equipment costs and manufacturing costs, the work tends to be complicated as compared with the fixed structure disclosed in Japanese Patent Application Laid-Open No. 61-184178.

As described above, in each of the above pin fixing structures, each link 6, 7 receives an external force in the thrust direction applied by the brim portion of the lower roller of the vehicle body and the roller guard, etc., so that each link 6 The lubricating oil sealing member 10 and the crush prevention spacer 11 disposed at the joints 6 and 7 are liable to be damaged or the like.

The present invention has been made to solve such a conventional problem.
While securing a sufficient fixing force in the axial direction, maintaining a stable fixing state by the pin fixing structure that plays a part in the fixing force, and without using a special jig, thus requiring an extra work space. An object of the present invention is to provide a link between a track and a pin of a traveling crawler belt, which can easily perform a pin fixing operation without using the pin.

[0015]

The above object is achieved by the inventions set forth in claims 1 to 3 of the present application. The invention according to claim 1 of the present invention relates to a crawler belt for a vehicle in which a pair of left and right links are connected endlessly via pins and bushes, and is a disc-shaped pin insertion having substantially the same diameter as the pins. A circular recess having a pin fixing member having a hole, a pin end having a circumferential groove into which a part of a peripheral portion of the pin insertion hole is fitted, and an inner peripheral surface for guiding rotation of the pin fixing member. A link end surface having a portion formed therein, wherein a center of rotation of the pin fixing member and a center of the pin are displaced from each other.

According to this configuration, the disc-shaped pin fixing member has a ring shape having a pin insertion hole having substantially the same diameter as the pin, and when the link is pressed into the pin, the pin insertion member is inserted. A pin is inserted into the hole, and the pin fixing member is brought into contact with the bottom surface of the circular recess formed in the opening of the pin press-fitting hole of the link. At this time, a circumferential groove for fitting the fixing member is formed on the outer periphery of the pin corresponding to the inner peripheral surface of the pin insertion hole of the pin fixing member. The center of rotation of the pin fixing member and the center of the circumferential groove are offset from each other.

Therefore, when the pin fixing member is rotated along the inner peripheral wall of the circular concave portion of the link, a part of the pin insertion hole of the pin fixing member fits into the circumferential groove. Become. In order to smoothly rotate the pin fixing member, it is necessary that the inner diameter of the concave portion is substantially the same as that of the pin fixing member, and the center of the concave portion matches the rotation center of the pin fixing member. Therefore, the center of the concave portion always coincides with the rotation center of the fixing member. Here, when rotating the pin fixing member along the inner peripheral wall of the circular concave portion of the link, two or more holes are drilled in the pin fixing member, a jig is inserted into the hole, and the jig is inserted. If the pin fixing member is rotated by using the pin fixing member, the work of fitting the pin fixing member into the circumferential groove becomes easy.

Further, since the outer peripheral surface of the pin fixing member is in contact with the inner peripheral surface of the concave portion, it does not shift in the radial direction, and once the pin fixing member is fitted into the circumferential groove of the pin. It does not come off the pin. In addition, since the pin fixing member is housed in the concave portion of the link, the link end surface functions as a protection wall from an external obstacle, and the fixing member is damaged or rotated by contact with the obstacle. As a result, the pin fixing member can be stably fixed without coming off the pin. Furthermore, since the pin end can also be prevented from protruding outside from the recessed portion, similarly to the fixing member, it does not come into contact with an external obstacle and the pin is hardly shifted.

On the other hand, the fixing force required to fix the pin in the axial direction naturally depends on the type of the crawler-type vehicle or the working environment as described above. For example, when there are many falling rocks around the feet, or when the ground itself has severe irregularities, the necessary fixing force is also increased, and conversely, less is required on flat ground, so that a stable fixing state of the pin is obtained. The required shear force will also change. In the present invention, the material to be used is selected for each environment, and the fitting amount can be changed depending on the rotation amount of the pin fixing member, the groove shape of the peripheral groove, or the like. It can easily respond to the environment.

Further, according to the present invention, even when the circumferential press-fit position of the pin and the link is changed due to local wear of the bush, the pin fixing member is rotated in a direction to be disengaged from the circumferential groove of the pin. The pin fixing member can be easily removed from the pin, and the pin and the link are originally press-fitted and fixed with a lower press force than before, so that when removing the link from the pin, the peripheral surface of the pin is scratched. It can be easily pulled out with a relatively low pulling force without leaving a mark.

In the invention according to claim 2, the center of rotation of the pin fixing member and the center of the pin are deviated,
The fixing structure for a link and a pin of a running crawler belt according to claim 1, wherein the center of the pin and the center of the circumferential groove coincide with each other. That is, according to the present invention, the center of the concave portion of the link and the rotation center of the pin fixing member coincide with each other, the centers thereof are eccentric from the center of the pin, and furthermore, the center of the circumferential groove formed at the end of the pin extends to the groove bottom. Stipulates a fixed structure having the same dimensions over the entire circumference.

When the pin fixing member is rotated in the recess from the position where the pin is inserted into the pin insertion hole of the pin fixing member,
Each eccentric position moves, and the fitting ratio between the pin fixing member and the circumferential groove of the pin changes according to the amount of movement. In the present invention, by changing the center position of the circumferential groove of the pin and the center of rotation of the pin fixing member, the amount of fitting of the pin fixing member to the circumferential groove in the circumferential direction is changed. Can be. Therefore, by changing the amount of rotation of the pin fixing member in the concave portion, the shearing force with respect to the axial relative movement between the pin and the link can be adjusted. Further, in the present invention, since the depth of the circumferential groove is the same over the entire circumference of the pin, the groove processing for the pin is easy.

On the other hand, the configuration of the invention according to claim 3 of the present invention is as follows.
2. The link between the link and the pin of the running crawler belt according to claim 1, wherein the center of rotation of the pin fixing member and the center of the pin are deviated, and the center of the pin and the center of the circumferential groove are deviated. In the structure.

In the present invention, since the center of rotation of the pin fixing member, the center of the pin and the center of the circumferential groove are all eccentric with respect to the counterpart, the pin center and the circle are rotated by rotating the pin fixing member. The amount of deviation between the center position of the circumferential groove and the center of rotation of the pin fixing member relatively changes, and the amount of fitting between the pin fixing member and the circumferential groove is determined by the pin center, the center of the circumferential groove, and the pin fixing member. Becomes equal to the sum of the respective deviation amounts of the rotation center of Therefore, in the present invention, the maximum fitting amount between the pin fixing member and the circumferential groove is larger than that of the invention according to claim 2 by the amount of eccentricity of the circumferential groove with respect to the pin.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a structural explanatory view showing a part of a link chain in a track according to the present invention;
FIG. 2 is an exploded view showing a part of the link chain in an exploded manner. In these figures, the same reference numerals are given to members and the like that are substantially the same as those in the related art shown in FIGS.

In FIG. 1 and FIG.
A pair of left and right endless links 6 and 7 are articulated to each other, and the plurality of ground contact shoes 2 shown in FIG. 7 are bolted to the shoe attachment holes 20 of the links 6 and 7. The link chain 3 and the crawler 2 constitute the crawler belt 1 of FIG. The crawler belt 1 is turned to a traveling drive wheel including a starting wheel disposed at a rear portion of a crawler type vehicle such as a construction machine (not shown), an idler wheel disposed at a front portion thereof, and a lower rolling wheel disposed at a central portion thereof. It is movably hung.

The link chain 3 has a link assembly indirectly connected to a plurality of joints 21. The link assembly includes a pair of left and right links 6 and 7 having a mirror-symmetrical relationship with each other, and a pin 5 connecting the links 6 and 7.
And a cylindrical bush 4 into which the pin 5 is press-fitted. The links 6 and 7 have end portions 2 alternately bent inward and outward at both front and rear ends excluding the center portion 22.
3 and 24. Two windows 25 are formed in the center portion 22 at the front and rear, and the footwear mounting hole 20 is formed with a flat mounting surface 26 formed on the outer periphery of the links 6 and 7.
And is formed at four places in front, rear, left and right, and communicates with the window 25. The length dimension of the pin 5 is set to be substantially the same as the outer width dimension between the left and right links 6 and 7. As shown in FIG. 2, bush engaging portions 28 for link press-fitting are formed on outer peripheral edges of both ends of the bush 4 via steps 27.

One end 24 of each of the left and right links 6 and 7 is a pin press-fitting end for coupling with the pin 5, and the pin press-fitting end 24 has the pin 5 A pin press-in hole 32 for press-fitting both ends of the link 23 is formed, and the other end 23 bent inside each of the links 6 and 7 is formed.
Constitutes a bush press-fit end for press-fitting and fixing the bush engaging portion 28, and a bush press-fit hole 36 for press-fitting the bush 4 is formed in the bush press-fit end 23. The dimension of the pin press-fitting end 24 in the front-rear direction is shorter than the size of the bush press-fitting end 23 in the same direction, and the tips of the pair of ends 23 and 24 are substantially semicircular. .

Each pin press-fitting hole 32 into which the pin 5 is press-fitted.
A fitting hole 30 is formed on the inner end face of the sealing member 10 for concentrically fitting the hermetic sealing member 10 having a diameter larger than that of the pin press-fitting hole 32 and the crush prevention spacer 11 of the sealing member 10. A circular recess 33 having a center at a position deviated from the center line of the pin press-fit hole 32 is formed on the outer end surface of the press-fit hole 32.
Are formed. The bush press-fit holes 34 formed in the links 6 and 7 are provided with locking holes 3 for locking the bush 4.
5 and an engagement hole 36 for the bush engagement portion having a diameter smaller than that of the engagement hole 35.

An oil injection hole 37 for injecting the lubricating oil is formed at the center of the end shaft of the pin 5.
A lubricating oil reservoir 38 communicating with the oil injection hole 37 is formed on the axis of the shaft. The lubricating oil reservoir 38 communicates with the outer peripheral surface of the pin 5 through a branch hole or an oil hole 39. The lubricating oil is supplied to the inner peripheral surface of the bush 4. The oil injection hole 37 is sealed by a lubricating oil sealing stopper (not shown).

FIGS. 3 and 4 show the pin 5 according to the present invention.
And shows a typical fixed structure example of the link 6 and 7,
3 shows a state before fixing, and FIG. 4 shows a state after fixing. The open end face of the pin press-fitting hole 32 of the link 6 and 7, have circular recess 33 having a center O ₂ is formed at a position eccentric by d ₁ with respect to the pin center O ₁ as described above,
A circumferential groove 40 that is continuous in the circumferential direction is formed at an end of the pin 5 that is pressed into the pin press-fit hole 32.

In these figures, a member denoted by reference numeral 41 is a pin fixing member 41 which is a part of the characteristic portion of the present invention, and the pin fixing member 41 has its rotation centers O ₄ and d _2.
And exhibits a donut shape having a pin insertion hole 42 having a center O ₅ only the eccentric position, the center O of the rotation center O ₄ and the pin insertion hole 42 In the present embodiment the pin fixing member 41 A rotation jig insertion hole 43 for rotating the pin fixing member 41 is formed on a straight line connecting the pin ₅ and the opposing position across the pin insertion hole 42. The rotation center O ₄ of the pin fixing member 41 coincides with the center O ₂ of the recess 33 formed on the end face of the link 6, 7, and its outer diameter is substantially equal to the inner diameter of the recess 33, and its inner diameter is It is set substantially equal to the outer diameter of the pin 5. The circumferential groove 40 formed at the end of the pin 5 has one side surface coincident with the bottom surface of the concave portion 33 of the link 6, 7, so that the entire volume of the circumferential groove 40 is equal to the concave portion 33. Is formed at a position to be exposed.

In this configuration, as shown in FIG. 3, the pin 5 press-fitted into the pin press-fitting holes 32 of the links 6 and 7 is inserted into the pin insertion hole 42 so that the pin fixing member 41 is formed.
Are fitted into the concave portions 33 of the links 6 and 7.

When the pin fixing member 41 comes into contact with the bottom surface of the concave portion 33, the pin fixing member 41 is moved to the concave portion 33.
In a state in which the pin abuts against the bottom surface of the pin fixing member 41, a tip pin of a rotating jig (not shown) is inserted into the rotating jig insertion hole 43 of the pin fixing member 41, and the pin is recessed around the rotation center O ₄ of the pin fixing member 41. The inside of the part 33 is rotated by 180 °. At this time, the outer peripheral surface of the pin fixing member 41 is slidably guided on the circular inner wall surface of the concave portion 33. As a result, the pin fixing member 41 is rotated about the center O ₂ of the concave portion 33 as the center O ₂ of the pin 5.
_As shown by hatching in FIG. 4 (b), the pin insertion hole peripheral edge of the large diameter side 41b of the pin fixing member 41 is fitted and fixed in the circumferential groove 40 of the pin 5 as indicated by hatching in FIG. .

The center O of the pin insertion hole_FiveIs a pin fixing member
The eccentric position moves by the rotation of 41, and the moving amount
The fitting amount between the pin fixing member 41 and the circumferential groove 40 varies depending on
However, this fitting amount is determined by the pin fixing member 41.
It is maximum when rotated by 180 °. In this embodiment
Is the pin insertion hole center O_FiveIs 2d with respect to the position before rotation ₁
As a result, the amount of movement of this eccentric position is
And the pin fixing member 41.
I can. Therefore, in order to secure this maximum fitting amount,
The depth of the circumferential groove 40 in the circumferential direction is set to the center O of the pin insertion hole.
_Five2d of eccentric position movement₁What should be equal to or more than
And However, a circumferential groove to secure this fitting amount
The groove depth of 40 naturally ensures the strength of the pin portion of the groove forming part.
Must be set within the range maintained.

After the pin fixing member 41 is fitted and fixed in the circumferential groove 40 of the pin 5, all of the outer peripheral surface of the pin fixing member 41 comes into contact with the inner peripheral surface of the concave portion 33 forming a rotation guide surface. As a result, there is no deviation in the radial direction, and once the pin fixing member 41 is fitted into the circumferential groove 40, it does not come off from the pin. In addition, even in a work environment in which there are many obstacles in the traveling crawler belt, since the pin fixing member 41 is housed in the recessed portion 33 of the link 6, 7, it is protected by the recessed shape. The fixing member 4 due to the contact with an obstacle, which is a problem in the fixing structure of the pin 5
Inconveniences such as damage to 1 are unlikely to occur. Further, since the fixing member 41 once fitted into the circumferential groove 40 does not rotate and come off due to contact with the obstacle, the pin fixing member 41 can be stably fitted and fixed by this structure. .

Further, the end of the pin 5 is also
Because it can be housed inside 3, without protruding outside,
As in the case of the pin fixing member 41 described above, the chance of contact with an external obstacle is reduced, and pin shift is less likely to occur.

On the other hand, the fixing force required to fix the pin 5 in the axial direction naturally varies depending on the type of various crawler type vehicles or the working environment as described above. The shear force acting between the circumferential groove 40 of the pin 5 and the peripheral edge of the pin press-fit hole 32 of the link 6, 7 also varies depending on the working environment of the vehicle. For example, when there are many falling rocks around the feet, or when the ground itself has severe irregularities, the fixing force required for the pins 5 and the links 6 and 7 also increases, and on the contrary, the fixing force can be reduced on flat ground, The shearing force applied to the fixing member 41 inevitably changes depending on those situations.

The shearing force applied to the pin fixing member 41 between the pin 5 and the links 6 and 7 is substantially proportional to the circumferential length of the circumferential groove 40 of the fixing member 41. It is changed by changing the fitting length. Since the shear force per unit length do it taking much the fitting portion is smaller, in the present invention, the relative offset amount of the rotation center O ₄ and the pin center O ₁ of the pin fixing member 41 Since the shearing portion can be changed by a relatively small design / manufacturing change such as changing the shearing force, it is possible to easily cope with the shearing force in each situation.

When the crawler belt is used for a long time, the rotation of the pin 5 causes the bush 4 to be locally worn,
If necessary, it is necessary to change the press-fit positions of the pins 5 and the links 6 and 7 in the circumferential direction. Even in such a case, according to the present invention, since the pin fixing member 41 is of a rotary fitting type with respect to the circumferential groove of the pin, if the pin fixing member 41 is rotated in a disengaging direction, the fitting into the circumferential groove 40 is performed. Can be released, and the pin fixing member 41 can be easily removed from the pin 5. Therefore, the pin 5 can be easily removed from the links 6 and 7. In addition, since the pin 5 and the links 6 and 7 are press-fitted and fixed by the press-fitting lower than before in this fixing method,
When removing the links 6 and 7 from the pin 5,
Can be easily extracted with a relatively low extraction force without leaving scratch marks on the peripheral surface.

In addition, due to long-term use exceeding the durability of each member, it may be necessary to replace a part of each component. Even in the case where the fixing member 41 needs to be replaced as described above, according to the present invention, the fixing member 41 can be easily removed from the pin 5 as described above. I can respond quickly to exchange.

FIGS. 5 and 6 show another representative embodiment of the present invention.
As a typical example, the center O 'of the pin 5 ₁And the center of the circumferential groove O '
_ThreeShows the pin fixing structure when
5 shows a state before fixing, and FIG. 6 shows a state after fixing.
You. It is formed on the opening end face of the press-fit hole 32 of the link 6,7.
The circular concave portion 33 is formed by the pin center O 'in the above embodiment.
₁Deviation d₁Δd than₁Big d₁’(= D
₁+ Δd₁) Of the pin center O '₁Eccentric from
Center O '_Twohave. The pin press-fit hole 3
The end of the pin 5 press-fitted into 2 has a circumferentially continuous circumference
A groove 40 'is formed.

[0043] According to this embodiment, ₃ 'center O' of the circumferential groove 40, connecting the rotational center O _'4 pins center O' ₁ and pin fixing member 41 'even on straight, 'when viewed from the _first pin fixing member 41' the pin center O to the large-diameter 41'b of a position eccentric by d _'2. That is, according to this example of the fixing structure, the groove depth of the circumferential groove 40 ′ changes from shallow to deep to shallow in the circumferential direction of the pin 5, and in the illustrated example, the depth is 0 → depth → 0. And at the deepest point, approximately 1 /
It is 3.

On the other hand, a pin fixing part forming a part of the feature of the present invention is provided.
The fixing member 41 'is located at the center O' of the pin insertion hole 42 '._FiveBut
Rotation center O 'of the fixing member 41'_Four(The center of the recess 33
O ' _TwoD 'for d'₁Only eccentric donut
Consists of a circular disk. Therefore, the center O 'of the pin insertion hole 42'
_FiveAs shown in FIG. 5, the small-diameter portion 41'a →
Large diameter portion 41'b → small diameter portion 41'a
You.

In this structure, as shown in FIG. 5, the pin 5 press-fitted into the pin press-fitting hole 32 of the link 6, 7 is inserted through the pin insertion hole 42 'so that the pin fixing member 4
1 'is fitted into the concave portion 33 of the link 6,7. When the pin fixing member 41 ′ comes into contact with the bottom surface of the concave portion 33, the rotation center O ′ ₄ (the center of the concave portion 33) is brought into contact with the pin fixing member 41 ′ in contact with the bottom surface of the concave portion 33. The interior of the recess 33 is rotated by 180 ° around O ′ ₂ ).
At this time, the outer peripheral surface of the pin fixing member 41 ′ is slidably guided on the inner wall surface of the concave portion 33. As a result, the pin fixing member 41 'is the center O of the pin 5' and at the same time rotates eccentrically relative to _1, eccentrically rotate relative to ₂ the insertion holes 42 'center O also recess 33', FIG. 6 (B), the large-diameter portion 41'b of the pin fixing member 41 'is fitted and fixed to the deepest portion of the circumferential groove 40' of the pin 5 as shown by hatching.

The center O 'of the pin insertion hole of this embodiment_FiveAgainst
Rotation center O 'of pin fixing member 41' _FourFigure 3 shows the deviation of
And Δd more than that of the above-described embodiment shown in FIG.₁Only many
Therefore, when the pin fixing member 41 ′ is rotated 180 °
The center position of the pin insertion hole 42 '
2Δd₁Will move. That is, this added
The amount of mating is greater than that of the above embodiment by the amount of movement of the eccentric position
Will be. On the other hand, the pin fixing member 41 ′ and the circumferential groove 4
In order to maximize the fitting amount with the circumferential groove 40 ',
The groove depth in the circumferential direction of the pin insertion hole center O '_FiveEccentric position
Increase of the position 2Δd₁Must be equal to or greater than

When the diameter of the pin 5 is the same as that of the above-described embodiment shown in FIGS. 3 and 4 and the amount of increase in the amount of eccentricity is large, the center of the circumferential groove O ′ is the same as in the above-described embodiment. _Three
And when to match the pin center O _'1, pin portion of the groove forming portion is tapered, the strength of the pin drops. It may be matched 'and ₃ pin center' circumferential groove center O and O ₁ if the required pin strength is ensured by the decrease amount, but if required the pin strength can not be ensured, the present embodiment as usual circumferential groove center O _'3 a 2Derutad ₁ or more, it is advisable better to move the engaging side to the opposite side. That is, in the present embodiment are the position d _'2 which displaced 2Derutad ₁ or more circumferential grooves around the center of the pin. At this time, the maximum fitting amount between the pin fixing member 41 ′ and the circumferential groove 40 ′ of the pin 5 depends on the pin center O ′ ₁ , the circumferential groove center O ′ ₃ and the pin fixing member 4.
It is equal to the sum of the deviation amounts of the rotation center O ′ ₄ of 1 ′,
The amount of eccentricity of the circumferential groove 40 'with respect to the pin 5 is larger than that of the embodiment shown in FIGS.

Therefore, according to the present invention, even when the ground has many irregularities and a large force is required for fixing the pin 5, the relative movement of the centers of the above-mentioned portions allows a wider fitting amount. Can be adjusted more flexibly in response to the necessary fixing force that varies depending on the surrounding environment of the vehicle.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view showing a part of a link chain in a crawler belt of the present invention.

FIG. 2 is an exploded view showing a part of the link chain in an exploded manner.

FIG. 3 is a structural explanatory view around a pin showing a state before fixing by a pin fixing structure which is a typical embodiment of the present invention.

FIG. 4 is a structural explanatory view around a pin showing a state after being fixed by the pin fixing member.

FIG. 5 is a structural explanatory view around a pin showing a state before fixing by a pin fixing structure according to another representative embodiment of the present invention.

FIG. 6 is a structural explanatory view around a pin showing a state after being fixed by the pin fixing member.

FIG. 7 is a perspective view in which a conventional crawler belt is partially cut away.

FIG. 8 is a main part top view showing a cross section of a part of a conventional pin retaining structure.

FIG. 9 is a sectional view of a main part showing another conventional pin retaining structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Crawler belt 2 Footboard 3 Link chain 4 Cylindrical bush 5 Pin 6 Left link 7 Right link 8 Pin annular groove 10 Seal member 11 Spacer 20 Footboard mounting hole 21 Joint part 22 Link central part 23 Bush press-fit end 24 Pin Press-fit end 25 Link window 26 Link mounting surface 27 Link press-fit bush engaging portion step 28 Link press-fit bush engaging portion 29 Pin press-fit hole 30 Pin press-fit hole spacer fitting portion 31 Pin press-fit hole spacer engaging step 32 Pin press-fit hole Pin tight fitting hole 33 Depressed portion 34 Bush press-fit hole 35 Bush press-fit hole Bush engaging hole 36 Bush press-fit hole Bush engaging hole 37 Oil injection hole 38 Lubricating oil reservoir 39 Branch hole or oil hole 40, 40 'Circumferential groove 41, 41' Pin fixing member 41a, 41'a Pin fixing member small diameter side 41b, 41'b Pin fixing portion Larger diameter 42, 42 'pin insertion hole 43, 43' rotating jig insertion hole O _1, O _'1 pin center O _2, O' ₂ recess center O _3, O _'3 circumferential groove center O _4, O _'4 pin fixing member rotation center O _5, O' ₅ pin insertion hole center d _1, d polarized circumferential groove center for 'deviation amount d _2, d of the fixing member center for _one pin center' ₂ pin center Displacement Δd Increase in displacement of the center of the fixed member with respect to the center of pin ₁

Claims (3)

[Claims] 1. A traveling track for a vehicle in which a pair of left and right links are connected endlessly via pins and bushes, and has a disc-shaped pin having a pin insertion hole having substantially the same diameter as the pin. A fixing member, a pin end portion having a circumferential groove into which a part of a peripheral portion of the pin insertion hole is fitted, and a circular concave portion having an inner peripheral surface for guiding rotation of the pin fixing member are formed. A link end surface of the track fixing member, wherein a center of rotation of the pin fixing member and a center of the pin are deviated. 2. The link of claim 1, wherein the center of rotation of the pin fixing member and the center of the pin are deviated, and the center of the pin coincides with the center of the circumferential groove. And pin fixed structure. 3. The running crawler belt according to claim 1, wherein the center of rotation of the pin fixing member and the center of the pin are deviated, and the center of the pin and the center of the circumferential groove are deviated. Fixed structure between link and pin.