JP2005212613A - Sprocket of crawler type traveling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the vibration of a crawler type tractor by absorbing shocks from a farm field by a cushioning member, and to improve the working efficiency by increasing the traveling speed of the crawler type tractor. <P>SOLUTION: The output of an engine 3 is transmitted to an output shaft 90, and a driving sprocket 11 to be engaged with a crawler belt 14 is mounted on a hub 110 fixed to the output shaft 90 in a penetrated manner. In this configuration, a vibration-isolating rubber 300 as an example of a cushioning member consisting of elastic material such as rubber and resin is provided in a cut-out 115, and the driving sprocket 11 is mounted on the hub 110 via the vibration-isolating rubber 300. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sprocket technology for a crawler type traveling device configured by winding a crawler belt between a driving sprocket and a driven sprocket.

2. Description of the Related Art Conventionally, a crawler type traveling device is adopted as a traveling device such as an agricultural work vehicle or a construction work vehicle.
Since such a crawler type traveling device has a small ground pressure, traveling performance superior to that of a wheel type traveling device can be obtained in a soft ground traveling or a work site that requires a large gripping force against the ground.
This crawler type traveling device transmits an output from a driving source such as an engine to an output shaft through a power train such as a transmission, and operates a crawler belt wound around a sprocket attached to the output shaft. It is possible to move.
An example of such a crawler type traveling device is disclosed in Patent Document 1 below.

JP 2002-316661 A

By the way, the above-described crawler type traveling device has a configuration in which a rigid sprocket is directly attached to the output shaft, and a crawler belt is wound around the drive sprocket and the driven sprocket. Lugs are formed on the outer periphery of the belt.
When the crawler type traveling device having such a configuration travels on a field with a lot of unevenness or a hard road surface, it directly receives an impact from the crawler belt.
Therefore, the impact is vibrated and transmitted to the sprocket and the output shaft, and the entire crawler tractor vibrates.
Such vibration is a burden for the operator who gets on the traveling machine body and works, and is not preferable for the crawler type traveling apparatus.
In addition, since such vibration increases as the traveling speed increases, the upper limit of the traveling speed of the crawler type traveling device is kept low, and satisfies the driver when it is desired to move the work vehicle efficiently. It wasn't.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

That is, in claim 1, in the sprocket of the crawler type traveling device for transmitting the output transmitted from the driving source to the crawler belt to be wound,
The sprocket wound around the crawler belt;
A shock absorber is provided between the sprocket and a hub for supporting the sprocket on the shaft, and the sprocket is configured as a sprocket of a crawler type traveling device.

  According to a second aspect of the present invention, the sprocket and the hub are fixed by bolts, and a sprocket for a crawler type traveling device is provided in which a positioning collar for determining a position is externally fitted on the bolts.

  According to a third aspect of the present invention, the sprocket is configured as a sprocket of a crawler type traveling device that is divided into a plurality of parts.

  In Claim 4, the attachment hole for attaching the said sprocket and the said hub is comprised as a sprocket of the crawler type traveling apparatus formed in a long hole.

  As effects of the present invention, the following effects can be obtained.

According to the configuration of the first aspect, the shock from the field can be absorbed by the buffer member, and therefore the vibration of the crawler tractor is suppressed.
Therefore, it is possible to increase the traveling speed of the crawler tractor and improve the working efficiency.

  With this configuration, it is possible to prevent the position of the sprocket from changing (displacement), and it is possible to improve the fastening workability with the bolt.

  According to the third aspect of the present invention, it is possible to easily remove the divided sprockets for each division unit in a state where the crawler belt is wound, and to improve the maintainability.

  According to the configuration of the fourth aspect, since it is possible to finely adjust the fastening operation with the bolt at the time of mounting the sprocket, the mounting of the sprocket is facilitated regardless of the processing accuracy of the sprocket and the like, and the mounting position thereof can be easily adjusted. It becomes possible to do.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The following best mode for carrying out the present invention is an example embodying the present invention, and is not intended to limit the technical scope of the present invention.
1 is an external view of a crawler tractor according to the best mode for carrying out the sprocket of the crawler type traveling device of the present invention, FIG. 2 is a side view of the crawler tractor shown in FIG. 1, and FIG. 3 is a drive sprocket of the crawler tractor. FIG. 4 is a sectional view of a drive sprocket of a crawler tractor, FIG. 5 is a detailed view of the attachment of the drive sprocket and the hub, FIG. 6 is an explanatory view when the drive sprocket is divided, and FIG. It is explanatory drawing in the case.

First, a schematic configuration of a crawler tractor according to the best mode for carrying out the sprocket of the crawler type traveling device of the present invention will be described with reference to FIGS. 1 and 2.
An engine 3 which is an example of a drive source of the crawler type traveling device is covered with a bonnet 4, and the engine 3 is fixed between main frames 6 and 6 on the lower left and right sides.
A steering column 2 is provided at the rear of the bonnet 4, a round steering handle 7 for performing a steering operation is disposed on the steering column 2, and a seat 8 is disposed behind the steering handle 7.
A step 18 is arranged below the steering column 2 and the seat 8 to constitute a driving part (cabin).
These operating parts are covered with a cabin frame 9. The cabin frame 9 also has a function of securing the operator's space in the event that the present crawler tractor falls.
In addition, a three-point link type mounting device 10 for mounting various working machines is provided at the rear end of the vehicle.

The crawler traveling device 1 is supported by a track frame 15.
A front differential case 16 is disposed on the front end side of the track frame 15 to support the drive sprocket 11, while an idler (driven sprocket) 12 is disposed on the rear end side.
The rollers 13, 13... Constituting the equalizer are rotatably supported between the drive sprocket 11 and the idler 12, and the drive sprocket 11, the idler 12, and the rollers 13, 13. The belt 14 is wound around.
Further, the tension of the crawler belt 14 can be adjusted by moving the idler 12 in the front-rear direction.
Since it is comprised in this way, since it becomes possible to rotate the crawler belt 14 by rotating the drive sprocket 11 with the output of the engine 3, the crawler tractor can run.

Next, the drive sprocket 11 will be described in detail with reference to FIGS. 3, 4, and 5.
FIG. 3 is an enlarged side view when the side surface of the drive sprocket 11 is viewed in the same manner as FIG. 2, and illustration of the crawler belt 14 and the like is omitted.
FIG. 4 is a cross-sectional view of the drive sprocket 11 shown in FIG.
FIG. 5 is an attachment detail diagram for explaining the attachment details of the drive sprocket 11 and the hub 110 shown in FIGS. 2 and 3.

First, an outline will be described with reference to FIGS. 3 and 4.
The output of the engine 3 is transmitted via a power train (not shown) such as a clutch and a transmission, and finally transmitted to the output shaft 90.
At this time, as shown in FIGS. 1 and 2, the drive sprocket 11 that can be engaged with the crawler belt 14 is attached to a hub 110 that is fixed in a state of being penetrated by the output shaft 90.
Therefore, the rotational force transmitted to the output shaft 90 is transmitted to the drive sprocket 11.
Specifically, as shown in FIG. 5, the drive sprocket 11 is attached to a disk-shaped hub 110.
An annular notch 115 is formed on the outer peripheral side of the hub 110 so that the drive sprocket 11 can be attached, and a plurality of attachment holes 116 are formed in the notch 115.
The holes 116 are mutually aligned with a plurality of holes 230 formed on the inner peripheral (center) side of the drive sprocket 11, and are used to fasten the hub 110 and the drive sprocket 11 with bolts 200 or the like. Is.
In this case, a screw is cut on the inner peripheral surface side of the hole 116 itself, and this screw is screwed with the screw of the bolt 200, whereby the drive sprocket 11 is fastened and fixed by the hub 110 and the bolt 200. ing.
Therefore, the drive sprocket 11 is fitted into the notch 115 formed on the outer peripheral side of the hub 110, and the hole 230 of the drive sprocket 11 is aligned with the position of the hole 116 of the hub 110 and fastened using the bolt 200. The drive sprocket 11 can be attached to the hub 110.
That is, since it is configured as described above, the drive sprocket 11 can be supported on the output shaft 90.
In addition, the cover 120 is fixed to the hub 110 with the five bolts 130 so that the tip portion of the output shaft 90 is not exposed to the outside and the nut 91 that fastens and fixes the hub 110 to the output shaft 90 is not loosened. It is said.
The hub 110 is spline-fitted to the output shaft 90.

In the case of the above-described configuration, the anti-vibration rubber 300 which is an example of a buffer member made of a material such as an elastic body such as a ring-shaped rubber or a resin configured in an L shape in cross section is attached to the notch 115, The drive sprocket 11 is attached to the hub 110 via the vibration rubber 300.
That is, the anti-vibration rubber 300 is interposed between the drive sprocket 11 and the hub 110 for attaching the drive sprocket 11 to the shaft.
With this configuration, the anti-vibration rubber 300 can absorb the impact received by the drive sprocket 11, and the vibration on the main unit side due to the impact from the farm can be suppressed.
Furthermore, as a result of suppressing the vibration of the crawler tractor, the traveling speed of the traveling crawler tractor can be increased, and the working efficiency can be improved.
Further, a protrusion 210 for engaging with the crawler belt 14 (dotted line portion in FIG. 4) is provided on the outer peripheral side of the drive sprocket 11.
In FIG. 3 and the like, in view of the symmetrical shape of the article and the visibility of the drawing, only one reference numeral is attached to the plurality of bolts 200, protrusions 210, bolts 130, and the like. In the following, it will be omitted as appropriate.

Further, when the drive sprocket 11 is attached to the hub 110, a positioning collar 220 that is substantially cylindrical and covers (covers) the shaft portion of the bolt 200 and fits into the hole 230 of the drive sprocket 11 is provided. It may be provided.
The positioning collar 220 is a member that is independent of the hub 110, the drive sprocket 11, and the anti-vibration rubber 300.
By externally fitting the positioning collar 220 onto the bolt 200 in this manner, the driving sprocket 11 can be easily positioned with respect to the hub 110 and prevented from falling down, and the bolt 200 is used to connect the driving sprocket 11 and the hub 110 to each other. The fastening operation can be easily performed.
Therefore, the workability of the fastening work between the drive sprocket 11 and the hub 110 can be improved.
The bolt 200 and the hole 116 of the hub 110 are screwed together, but the bolt 200, the hole 230 of the drive sprocket 11 and the positioning collar 220 are only fitted to each other.
Therefore, when an impact or the like is received from a field or the like, the drive sprocket 11 can move slightly in the direction of the white arrow (lateral direction) shown in FIG. Therefore, vibration can be effectively suppressed.
Of course, the vibration of the drive sprocket 11 is also absorbed by the lower surface side (center side surface of the hub 110) of the vibration-proof rubber 300 formed in an L shape even with respect to the vibration in the vertical direction.

Further, the hole 230 on the drive sprocket 11 may be formed as a long hole having a substantially elliptical shape.
Thus, by forming the hole 230 into a long hole, when the drive sprocket 11 is attached to the hub 110, it becomes easy to align the hole 230 of the drive sprocket 11 with the position of the hole 116. The sprocket 11 can be easily attached, and the fastening operation by the bolt 200 is facilitated.
Furthermore, as will be described later, there is an effect of absorbing an impact.

Next, as shown in FIG. 6, the drive sprocket 11 may have a plurality of configurations, for example, divided into three (every 120 degrees).
In this case, the drive sprocket 11 includes three fan-shaped divided sprockets 11a, a divided sprocket 11b, and a divided sprocket 11c.
In addition, a plurality of elongated holes such as a substantially elliptical shape are formed in the attachment portions of the divided sprockets 11a to 11c.
As shown in FIG. 6, the long holes may be formed so that the directionality (the long diameter direction of the long holes) is determined in advance for each divided sprocket.
In this case, the long hole 230a corresponds to the divided sprocket 11a, the long hole 230b corresponds to the divided sprocket 11b, and the long hole 230c corresponds to the divided sprocket 11c.
FIG. 6 shows a specific example in the case where eight long holes are formed in each divided sprocket. As already described above, in order to make the drawing easy to see, the long holes 230a, the long holes 230b, the long holes are shown. Reference numerals such as 230c indicate only one.
A bolt 200 is fitted in each of the long holes 230a to 230c.

For example, as shown in FIG. 6, when the crawler belt 14 comes into contact with the obstacle 400 on the running surface, the divided sprocket closest to the obstacle 400 is impacted. It is determined to move slightly in the direction of absorbing water.
Specifically, as shown in FIG. 6, when the boundary portion between the divided sprocket 11b and the divided sprocket 11c is subjected to an impact by the obstacle 400, the direction of the arrow (1) (from the obstacle 400 to the center of the hub 110). The long diameter direction of the long hole 230b may be formed so that the split sprocket 11b slightly moves in the direction).
That is, when the divided sprocket is at the position of the divided sprocket 11b shown in FIG. 6, the major axis direction of the long hole coincides with the direction of the impact received from the obstacle 400 (the direction of the arrow (1)).
At this time, as shown in FIG. 6, for example, even if the split sprocket 11b moves in the direction of the arrow (1), the vibration isolating rubber 300 can absorb the vibration, and the vibration to the crawler tractor can be suppressed. It becomes.
Further, since the drive sprocket is divided in this way, it is possible to easily remove the sprocket from the hub 110 during maintenance or replacement of the crawler belt 14 or the entire sprocket.
That is, since the unit of the sprocket to be handled is divided and made smaller, for example, even when the crawler belt 14 is attached to the crawler traveling device 1, there is a sprocket in which the sprocket and the crawler belt are not engaged with each other. The sprocket can be detached from the hub 110 for each division unit.
Therefore, there is no need to perform troublesome work such as once removing the crawler belt 14 completely and performing maintenance or the like.
Here, the case where the number of divisions of the drive sprocket 11 is 3 has been described, but even if the number of divisions is other than 3, the same effect can be obtained because the handling unit of the sprocket is reduced. .

Further, when the boundary between the split sprocket 11a and the split sprocket 11c is on the upper surface side of the crawler belt 14, the load of the entire machine body is applied to the sprocket via the output shaft 90, the hub 110, and the bolt 200 in the direction of arrow (2) Force is applied in the vertical direction.
Since the force in the direction of the arrow (2) does not coincide with the long diameter direction of the long hole 230a, the split sprocket 11a does not move.
On the other hand, the force in the direction of the arrow (2) coincides with the major axis direction of the long hole 230c, but the movement is restricted by the divided sprocket 11b at the lower position, so the divided sprocket 11c does not move downward.
That is, since the major axis direction of the long hole is different for each divided sprocket, even if a force is applied to a single divided sprocket, the direction of the force and the major axis direction of the long hole are not the same unless the position of the divided sprocket is the same. Will not change.
Therefore, the three split sprockets 11a to 11c move unnecessarily, and the winding state of the crawler belt 14 is not disturbed, and smooth running can be realized.
In addition, by forming the long holes in each split sprocket in this way, each split sprocket moves little by little by the above-mentioned force or other force (centrifugal force, etc.), so the balance as a whole split sprocket is good. It will be aligned with nature.

Next, FIG. 7 shows a case where the entire sprocket is rotated about 60 degrees counterclockwise from the state of FIG.
FIG. 7 shows a state in which an impact from the obstacle 400 is received at the central portion of the outer periphery of the split sprocket 11c.
Also in this case, as in the case of FIG. 6, the impact in the direction of arrow (1) is transmitted to the vicinity of the center of the outer periphery of the split sprocket 11c by the obstacle 400.
At that time, the divided sprocket 11c tries to move toward the divided sprocket 11b, which is the long diameter direction of the long hole 230c. However, the operation direction is different from the long diameter direction of the long hole 230b of the divided sprocket 11b. Does not move.
Further, when the load of the traveling machine body is in a state where a force is applied in the direction of the arrow (2) via the output shaft 90, the hub 110, and the bolt 200, the divided sprocket 11a is the divided sprocket whose longitudinal direction is the long hole 230a. Try to move to the 11c side.
However, since the operation direction is different from the major axis direction of the long hole 230c of the split sprocket 11c, the split sprocket 11a does not move after all.
As for the divided sprocket 11b, as described above, it receives the force of the divided sprocket 11a and the like, but does not move. On the other hand, the divided sprocket 11b itself moves downward due to the weight of the divided sprocket 11b itself. It does not move after all due to the elastic force of the anti-vibration rubber 300 and the fastening force of the bolt 200.
In this case, each divided sprocket basically does not move, but the vibration-proof rubber 300 sandwiched between the hub 110 and each divided sprocket has an effect of reducing vibration and suppressing vibration.

The external view of the crawler tractor which concerns on the best form for implementing the sprocket of the crawler type traveling apparatus of this invention. The side view of the crawler tractor shown in FIG. The enlarged side view of the drive sprocket of a crawler tractor. Sectional drawing of the drive sprocket of a crawler tractor. Detailed installation diagram of drive sprocket and hub. Explanatory drawing at the time of dividing | segmenting a drive sprocket. Explanatory drawing at the time of dividing | segmenting a drive sprocket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crawler type traveling apparatus 2 Steering column 4 Bonnet 7 Steering handle 11 Drive sprocket 11a, 11b, 11c Split sprocket 12 Idler 14 Crawler belt 110 Hub 115 Groove 116 Hole 200 Bolt 210 Projection part 230 Hole 300 Anti-vibration rubber

Claims (4)

In the sprocket of the crawler type traveling device for transmitting the output transmitted from the driving source to the crawler belt to be wound,
The sprocket wound around the crawler belt;
A sprocket for a crawler type traveling device, characterized in that a buffer member is provided between a hub for pivotally supporting the sprocket on a shaft.   The sprocket of the crawler type traveling device according to claim 1, wherein the sprocket and the hub are fixed with bolts, and a positioning collar for determining a position on the bolts is externally fitted.   The sprocket of the crawler type traveling device according to claim 1, wherein the sprocket is divided into a plurality of parts.   The sprocket of the crawler type traveling device according to any one of claims 1 to 3, wherein an attachment hole for attaching the sprocket and the hub is formed as a long hole.

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