JP4364387B2 - Crawler drive sprocket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crawler driving sprocket that transmits a driving force to a crawler traveling body.
[0002]
[Prior art]
An example of this kind of drive sprocket is disclosed in Japanese Patent Laid-Open No. 6-144306.
In this technology, a single protrusion drive type sprocket is configured by attaching rings to both side surfaces of the sprocket, and the inner diameter of the ring is larger than the root circle diameter of the sprocket and smaller than the tip circle diameter, A mud discharge gap is provided from the sprocket tooth bottom to the ring side surface (conventional example 1).
[0003]
In addition, in this publication, as another technique, a ring is attached to both sides of a sprocket to form a single protrusion driven sprocket, and a semicircular hole that substantially matches the shape of the sprocket teeth in side view is provided. A device in which a large number of holes are formed in the ring to form a mud discharge gap is disclosed (conventional example 2).
[0004]
[Problems to be solved by the invention]
In each of the above prior arts, the ring is disposed on the left and right sides of the protrusion, thereby restricting the left and right positions of the crawler, and has a function to prevent the wheel from being removed. By allowing mud and pebbles biting between teeth to be discharged from both sides of the sprocket, it was possible to prevent crawler derailment and loss of transmission of drive force due to accumulation of mud, etc. .
However, in the technology of Conventional Example 1, since the mud discharge gap is formed only in a narrow range corresponding to the tooth bottom of the sprocket and most of the gap is blocked by the ring, a sufficient mud discharge function is provided. However, there is still a possibility that wheel removal, drive loss, etc. may occur.
[0005]
On the other hand, in the technique of Conventional Example 2, since both sides of the teeth are completely exposed by drilling a large number of semicircular arc holes that substantially match the shape between the sprocket teeth in the ring, compared to Prior Art 1. Although the mud discharge function is improved, it is necessary to form a large number of semicircular arc holes corresponding to both sides between all the teeth, so that the processing cost increases and the strength decreases. There is also a risk that the function of position regulation (prevention of wheel removal) may be impaired.
In view of such circumstances, the present invention provides a crawler driving sprocket capable of reducing the cost, improving the strength, preventing the wheel from being removed, etc., while allowing the mud or the like entering the groove between the sprocket teeth to be suitably discharged. For the purpose.
[0006]
[Means for Solving the Problems]
The present invention takes the following technical means to achieve the above object.
That is, the crawler driving sprocket according to the present invention includes a sprocket body 10 having a large number of teeth 4 meshing with the protrusions 3 provided on the inner periphery of the crawler traveling body 2 on the outer peripheral portion, and a groove 4A between the teeth 4 is formed. A closing member 11 that closes the left and right sides is provided, and the left and right sides of the groove 4A are open.
According to this, by closing the left and right sides of the groove 4A with the closing member 11, the left and right positions of the crawler traveling body 2 are regulated to prevent the wheel from being removed, and the other side is opened to remove mud and the like. It is possible to discharge suitably, and it is possible to prevent derailment, drive loss, and the like due to accumulation of mud and the like.
[0007]
At this time, it is preferable that the groove 4A closed on the left side and opened on the right side and the groove 4A closed on the right side and opened on the left side are alternately provided every predetermined number in the circumferential direction. Thus, the blocking member 11 can suitably maintain the anti-derailing function over the entire circumference of the sprocket, and the right and left weight balance and strength balance of the entire sprocket can be properly maintained.
The closing member 11 has a ring shape or a disk shape and is attached to each of the left and right side surfaces of the sprocket body 10, and a peripheral portion 11B that closes the side of the groove 4A, and an open portion 11A. It is recommended to form
[0008]
As a result, the groove 4A that is closed on one side and the groove 4A that is opened can be easily configured just by attaching the closing member 11 to the side surface of the sprocket body 10, and the assembly workability is improved. At the same time, the number of parts and cost can be reduced.
Further, as described above, when the grooves 4A closed on the left side and opened on the right side and the grooves 4A closed on the right side and opened on the left side are alternately provided for every predetermined number in the circumferential direction. In the outer peripheral portion of the closing member 11 having a ring shape or a disk shape, the portions 11B that close the sides of the predetermined number of grooves 4A and the open portions 11A may be alternately formed in the circumferential direction.
[0009]
Furthermore, in this case, the same shape of the blocking member 11 is used for both side surfaces of the sprocket body 10, and the blocking members 11 may be attached with their phases shifted from each other by the predetermined number of groove pitches. Thus, it is possible to reduce the types of parts of the closing member 11.
The configuration in which the side of the groove 4A is opened can be realized by forming a groove 11A or a hole having substantially the same shape as the groove 4A between the teeth 4 on the outer periphery of the closing member 11. Since the grooves 11A or the holes are not formed corresponding to the grooves 4A between all the teeth 4, a reduction in processing cost and a reduction in strength are prevented.
[0010]
As the closing member 11, a plurality of members closing the side of one or a plurality of grooves 4 </ b> A may be provided, and each closing member 11 may be provided at intervals in the circumferential direction with respect to each side surface of the sprocket body 10. .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention. In particular, as shown in FIGS. 1 and 2, the drive sprocket 1 according to the present invention is formed in an endless belt shape. The crawler traveling body 2 is wound, the teeth 4 of the sprocket 1 are meshed with a large number of protrusions 3 formed on the inner periphery thereof, and the power is transmitted from the drive shaft connected to the boss portion 5 at the center of the sprocket 1, The crawler traveling body 2 is driven to rotate through the teeth 4 and the protrusions 3.
[0012]
In the present specification, the direction of the rotation axis of the sprocket 1 is described as the left-right direction.
The crawler traveling body 2 is made of an elastic material such as rubber, and is formed with an endless belt-like crawler body 7, a number of lugs 8 formed on the outer peripheral surface of the crawler body 7 in the circumferential direction, and a number of circumferentially formed on the inner peripheral surface. And the projection 3.
The drive sprocket 1 according to the present invention transmits power by engaging with the projections 3 arranged in a line at the center in the width direction of the crawler body 7 or at a position eccentric to the left and right. May be formed of an elastic material integrally with the crawler main body 7, and when a core metal is embedded in the crawler main body 7, a part of the core metal protrudes to the inner peripheral side. It may be formed by doing so.
[0013]
The drive sprocket 1 is attached to the left and right side surfaces of the sprocket body 10 having a large number of teeth 4 on the outer peripheral portion, and the side of the groove 4A between the teeth 4 It has a configuration having a closing member 11 that can be closed.
As shown in FIG. 4, the closing member 11 is composed of a ring-shaped plate material having an opening 12 in the center, and the outermost diameter is the outermost diameter (tooth tip portion) of the sprocket body 10. And the inner diameter dimension (diameter dimension of the opening 12) is set to be smaller than the diameter dimension of the bottom portion of the groove 4A.
[0014]
Around the opening 12, a plurality of through holes 13 are formed at substantially equal intervals in the circumferential direction. Correspondingly, a plurality of female screw holes 14 are formed at substantially equal intervals in the circumferential direction on the side surface of the sprocket body 10. The closing member 11 is detachably fixed to the sprocket body 10 by matching the holes 13 and 14 and inserting and screwing the fixing screws 15 into the holes.
The closing member 11 is not limited to being detachable from the sprocket body 10 but may be fixed so as not to be detachable by welding or the like. Further, the outermost diameter dimension of the closing member 11 is made larger or smaller than the outermost diameter dimension of the sprocket body 10 as long as it does not interfere with the engagement between the teeth 4 and the protrusions 3 and the left-right position regulation of the crawler traveling body 2. be able to. Further, the closing member 11 is not limited to being formed in a ring shape, but may be formed in a disk shape or the like that secures at least an insertion hole for the drive shaft connected to the boss portion 5.
[0015]
A large number of grooves 11A having substantially the same shape as the grooves 4A between the teeth 4 are formed on the outer periphery of the closing member 11 in the circumferential direction with a pitch P2 that is twice the pitch 4A of the grooves 4A of the sprocket body 10.
Then, when the groove 11A of the closing member 11 is aligned with the groove 4A of the sprocket body 10, the closing member 11 is attached to the side surface of the sprocket body 10 so that when viewed from one side of the sprocket body 10, each groove 4A Are closed by the closing member 11 every other circumferential direction and are opened via the grooves 11A every other circumferential direction.
[0016]
Therefore, in the outer peripheral portion of the closing member 11, a portion 11B that closes the side of the groove 4A and an open portion (the groove 11A) are alternately arranged in the circumferential direction for each groove 4A (every pitch of the groove 4A). Will be formed.
Further, the closing members 11 and 11 attached to the left and right side surfaces of the sprocket body 10 use the same parts, and are shifted in phase from each other by one groove pitch P1 of the sprocket body 10.
Therefore, when one groove 4A of the sprocket body 10 is viewed, one side of the groove 4A is closed by one closing member 11, and the other side of the groove 4A is closed by a groove 11A of the other closing member 11. It is designed to be opened.
[0017]
Looking at the entire circumference of the sprocket body 10, a groove 4 </ b> A that is open on the left side and closed on the right side and a groove 4 </ b> A that is open on the right side and closed on the left side are separated by one circumferential direction ( In other words, the grooves 11A and the closed portions 11B are arranged in a zigzag manner in the circumferential direction.
With the above-described configuration, mud, pebbles and the like bitten into the tooth groove 4A of the sprocket body 10 are suitably discharged from the open portion 11A on one side of the groove 4A, and the other side of the groove 4A is a closed portion 11B. Therefore, the crawler traveling body 2 is restricted in the left-right position to prevent the wheel from coming off.
[0018]
Further, since the groove 4A opened on the left side and closed on the right side and the groove 4A opened on the right side and closed on the left side are alternately arranged in the circumferential direction, the left and right sides of the drive sprocket 1 are arranged. The weight balance, strength balance, and the like can be suitably maintained as a whole, and the left-right position restriction (derailing prevention function) of the crawler traveling body 2 can be properly maintained over the entire circumference.
The grooves 11A formed in each closing member 11 do not correspond to all the grooves 4A of the sprocket body 10, but are formed corresponding to every other groove 4A, so that machining costs and strength are prevented from being reduced. Furthermore, by providing the same closing member 11 with respect to the left and right side surfaces of the sprocket body 10 with the phases shifted, the number of parts can be reduced.
[0019]
Note that the shape of the groove 11A of the closing member 11 is not necessarily the same shape as the groove 4A of the sprocket body 10, and may be any shape that can open the whole or most of the groove 4A. Furthermore, it can be formed in a hole shape instead of a groove.
On the other hand, the closed portion 11B is not limited to the one that completely closes the side of the groove 4A of the sprocket body 10, but can block the most part and reliably regulate the left-right position of the crawler traveling body 2. That's fine.
FIG. 5 shows a second embodiment of the present invention.
[0020]
In the first embodiment, the blocking member 11 is formed of a ring-shaped plate material, whereas in the present embodiment, a plurality of plate-shaped blocking members 11 that can block the sides of the predetermined number of grooves 4A. Are individually attached at intervals in the circumferential direction.
In the illustrated example, each closing member 11 has a width that can close two adjacent grooves 4A, and is attached with bolts 15 in the circumferential direction with an interval corresponding to the pitch of the two grooves 4A. It has become.
[0021]
Further, the respective blocking members 11 attached to the left and right side surfaces of the sprocket body 10 are arranged in a staggered manner on the left and right sides with their phases shifted from each other by the pitch of the two grooves 4A.
In this embodiment, the same effects as those of the first embodiment can be obtained. However, since it is necessary to individually attach a large number of blocking members 11 to the sprocket body 10, the number of parts increases and attachment workability is improved. It will be inferior. On the other hand, since it is not necessary to form the groove 11A for each closing member 11, workability is improved.
[0022]
The present invention is not limited to the above-described embodiment, and can be appropriately changed in design.
In the first and second embodiments, the groove 4A, which is closed on the left side and opened on the right side, and the groove 4A, which is closed on the right side and opened on the left side, are separated by one or two (1 Alternatively, every two pitches) may be alternately arranged, but every three or more may be arranged, and these two kinds of grooves 4A may be randomly arranged in the circumferential direction.
In the second embodiment, the closing member 11 having a width capable of closing the side of one groove 4A may be attached in the circumferential direction at intervals of every other groove 4A.
[0023]
In addition, a ring-shaped blocking member 11 as shown in the first embodiment is used on one side of the sprocket body 10, and a split type blocking member 11 as shown in the second embodiment is combined on the other side. May be used.
You may form the collar part bent in the outer peripheral part of the obstruction | occlusion member 11 right and left outward.
[0024]
【The invention's effect】
As described above in detail, according to the present invention, mud or the like that has entered the groove between the sprocket teeth can be suitably discharged from one side of the groove, and the other side is closed by a closing member, so that the crawler It is possible to restrict the left and right positions of the main body and prevent the wheel from falling off. In addition, since only one side of each groove is opened, it is possible to reduce the number of processing parts such as grooves and holes for opening the side, and it is possible to reduce costs and prevent strength reduction.
[Brief description of the drawings]
FIG. 1 is a side view of a drive sprocket according to a first embodiment of the present invention.
FIG. 2 is a front sectional view of the same.
FIG. 3 is an enlarged perspective view of the main part.
FIG. 4 is a side view of the closing member.
FIG. 5 is a side view of a drive sprocket according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crawler drive sprocket 2 Crawler traveling body 3 Protrusion 4 Teeth 4A Groove 10 Sprocket body 11 Closure member 11A The part which opens groove 4A (groove)
11B Portion that closes the groove 4A

Claims (6)

A sprocket body (10) having a large number of teeth (4) meshing with protrusions (3) provided on the inner periphery of the crawler traveling body (2) is provided on the outer periphery, and a groove (4A) between the teeth (4) A crawler drive sprocket comprising a closing member (11) for closing one side of the left and right sides, and opening the other side of the groove (4A). A groove (4A) that is closed on the left side and open on the right side and a groove (4A) that is closed on the right side and open on the left side are alternately provided for each predetermined number in the circumferential direction. The crawler driving sprocket according to claim 1. The closing member (11) has a ring shape or a disk shape and is attached to the left and right side surfaces of the sprocket body (10), and a portion (11B) for closing the side of the groove (4A) on the outer periphery thereof. The crawler driving sprocket according to claim 1, wherein an opening portion (11 </ b> A) is formed. The blocking member (11) has a ring shape or a disk shape and is attached to each of the left and right side surfaces of the sprocket body (10), and a portion for closing the side of the predetermined number of grooves (4A) on the outer periphery thereof ( 11. The sprocket for driving a crawler according to claim 2, wherein the open portions (11 </ b> A) are alternately formed in the circumferential direction. The closure member (11) having the same shape is attached to both side surfaces of the sprocket body (10), and the phases are shifted from each other by the predetermined number of grooves 4A. A sprocket for driving a crawler as described in 1. A plurality of closing members (11) for closing the side of the one or more grooves (4A) are provided, and each closing member (11) is attached to each side surface of the sprocket body (10) at intervals in the circumferential direction. The crawler driving sprocket according to claim 1, wherein the crawler driving sprocket is provided.

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