JP4371691B2 - Elastic crawler and crawler traveling device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coreless elastic crawler suitable for a crawler traveling device that travels at a relatively high speed.
[0002]
[Prior art]
For example, in a high-speed crawler vehicle such as a full truck, a half truck, and an RV vehicle in which a crawler traveling device is mounted instead of a wheel, it is necessary to employ a crawler traveling device that can travel on both rough terrain and public roads. In such a crawler traveling device for a high-speed crawler vehicle, it is necessary to employ an elastic crawler having flexibility and light weight capable of high-speed rotation because the traveling speed becomes relatively large.
As such an elastic crawler having both flexibility and light weight, there is, for example, a coreless-less type in which no cored bar is embedded in the crawler body, and this type of elastic crawler is usually constant in the circumferential direction. A crawler body in which a plurality of drive projections arranged at intervals are integrally projected from the inner circumferential surface, a lug group formed in a predetermined pattern on the outer circumferential surface of the crawler body, and a circumferential direction inside the crawler body And a tensile body embedded along the side (see Patent Document 1).
[0003]
FIGS. 5A to 5C show a driving method of the coreless-less type elastic crawler 21. Among these, in the drive system shown in FIG. 5A, split projections 23 are formed that are split symmetrically with respect to the center line in the width direction of the crawler body 22 as a symmetry axis, and the drive sprocket 24 is a single central disk 25. The drive pins 26 project from both side surfaces of the outer peripheral portion of the outer peripheral portion of the motor. The drive pins 26 are engaged with the divided projections 23 to transmit the rotation of the drive sprocket 24 to the elastic crawler 21.
[0004]
5B, a continuous protrusion 27 is formed in the width direction of the crawler main body 22 and is continuous in the width direction. The drive sprocket 24 is formed between the outer peripheral portions of the pair of left and right divided disks 28. Are connected to each other by a drive pin 29, and the drive pin 29 is engaged with the continuous protrusion 27 to transmit the rotation of the drive sprocket 24 to the elastic crawler 21.
Further, in the drive system shown in FIG. 5C, the drive sprocket 24 is composed of a pair of left and right rubber tires 31 that abut on the inner peripheral surface of the crawler body 22 across the drive protrusion 30. The rotation of the drive sprocket 24 is transmitted to the elastic crawler 21 by the frictional force between the surface and the inner peripheral surface of the crawler body 22.
[0005]
[Patent Document 1]
JP-A-10-129547 (FIGS. 1 and 4)
[0006]
[Problems to be solved by the invention]
Among the conventional driving methods described above, in the pin driving method shown in FIGS. 5A and 5B, the driving pins 26 and 29 of the driving sprocket 24 and the driving protrusions (the divided protrusions 23 or the continuous protrusions 27) of the crawler body 22 Since the rotation of the drive sprocket 24 is transmitted to the elastic crawler 21 only by engaging the drive pin, for example, when used for a relatively large traveling vehicle such as a medium- or large-sized transport vehicle or a construction machine, the drive pin Drive protrusions may be deformed by an excessive driving force received from 26 and 29, and a pitch error or wheel removal may occur.
[0007]
In addition, when such a pin-driven elastic crawler 21 is used in a traveling vehicle such as a combine that travels on rough terrain, mud and earth caught in the drive sprocket 24 are driven protrusions (divided protrusions 23 or continuous protrusions 27). ), Which may cause a pitch error and a derailment. In order to prevent such pitch error and wheel removal, the tension on the elastic crawler 21 may be increased. However, this causes a new problem that rotational resistance increases, energy loss increases, and fuel consumption deteriorates. appear.
[0008]
On the other hand, in the friction drive system shown in FIG. 5 (c), when mud or earth and sand adheres to the inner peripheral surface of the crawler body 22, the frictional force of the drive sprocket 24 (tire 31) is reduced to generate slip, and an elastic crawler. 21 may not be able to sufficiently transmit the driving force. In order to prevent such slip, the tension on the elastic crawler 21 may be increased. However, in this case as well, there arises a problem that the rotational resistance increases and the energy loss increases.
[0009]
In view of such circumstances, the present invention is capable of suppressing the deformation of the drive protrusion without increasing the tension on the crawler body more than necessary, and preventing pitch error and wheel removal without deteriorating fuel consumption. An object of the present invention is to provide an elastic crawler without a mandrel.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention takes the following technical means.
That is, according to the present invention, in the core-less elastic crawler adopting the above-described pin driving method, the drive holes in which the sprocket teeth provided on the drive sprockets are fitted separately from the drive pins are arranged at regular intervals in the circumferential direction. The crawler main body is formed in a lined state, and the drive projection is shifted in the circumferential direction with respect to the drive hole, and the first portion on which the sprocket teeth are caught and both sides in the width direction of the first portion. And a second portion with which the drive pin engages, and the first and second portions are formed of continuous protrusions that are continuous in the width direction.
[0011]
In this case, the rotation of the drive sprocket is transmitted to the elastic crawler not only by the drive pin of the drive sprocket engaging the drive protrusion of the crawler body but also by the sprocket teeth of the sprocket engaging the drive hole of the crawler body. As a result, the load applied to the drive protrusion is reduced compared to the case where power is transmitted only by the former engagement. For this reason, it is possible to suppress the deformation of the drive protrusion without increasing the tension on the crawler body more than necessary.
Further, since the sprocket teeth of the drive sprocket are fitted in the drive holes of the crawler body, the crawler body is prevented from shifting in the width direction with respect to the drive sprocket, and the function of preventing the elastic crawler from falling off is improved.
Furthermore, if a continuous protrusion is used as the driving protrusion, the sprocket teeth of the driving sprocket will be caught not only by the driving hole but also by the driving protrusion (see FIG. 3A), thus preventing the pitch error of the elastic crawler. The function is further improved.
[0012]
In the present invention described above, the drive hole is preferably formed of a through hole that penetrates the crawler body in the front and back direction. If a drive hole consisting of such a through hole is used, the mud and earth caught by the drive sprocket will be discharged from the drive hole to the outside of the diameter, making it more effective for pitch errors caused by mud and earth adhering to the drive protrusion. Can be prevented .
[0013]
Also, the drive holes are arranged in the center in the width direction of the crawler body, wherein the continuous protrusions may be disposed in the lateral center of the crawler body.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a coreless elastic crawler 1 according to a reference example including a configuration common to the embodiment of the present invention, and FIG. 2 shows a crawler traveling device 2 using the crawler 1.
The crawler traveling device 2 of the present reference example is mounted in place of wheels of a full track, a half track, an RV vehicle, or the like so that it can travel on both rough terrain and public roads. As shown in FIG. 2, the traveling device 2 includes a drive sprocket 3 disposed at the upper center as a drive wheel, a pair of front and rear idlers 4 and 4, and a plurality of rows arranged between the idlers 4 and 4. The elastic crawler 1 is wound around these outer circumferences in a substantially triangular shape when viewed from the side.
[0015]
As shown in FIG. 1, the elastic crawler 1 of the present reference example has a core bar in which a plurality of drive projections 7 arranged at regular intervals in the circumferential direction (in the direction of arrow x in FIG. 2) are integrally projected from the inner circumferential surface. A crawler main body 8 of a loess, a lug group 9 composed of a large number of lugs 9A formed in a predetermined lug pattern on the outer peripheral surface of the crawler main body 8, and a resistance embedded in the crawler main body 8 along the circumferential direction. The tension body 10 and the width direction reinforcement layer 11 embed | buried under the outer peripheral side of the tension body 10 in the inside of the crawler main body 8 are provided.
[0016]
Among these, the crawler main body 8 is formed in an endless belt shape having a substantially constant thickness by a rubber-like elastic body, and the crawler main body 8 has a central portion in the width direction (the left-right direction in FIG. 1A) on the inner peripheral surface. The driving projection 7 made of a rubber-like elastic body made of the same material as the crawler body 8 is integrally projected. The drive protrusion 7 of this reference example is composed of divided protrusions 12 that are substantially symmetrical in shape when viewed from the side, and are divided symmetrically about the widthwise center line of the crawler body 8.
[0017]
Each of the divided protrusions 12 is provided over the entire circumference of the crawler body 8 at a constant interval in the circumferential direction, and a drive pin 13 (described later) protruding from the drive sprocket 3 is engaged with each divided protrusion 12. By combining them, the elastic crawler 1 can be driven along the circumferential direction. In addition, you may decide to embed the hard resin-made or metal-made reinforcement member in the inside of this division | segmentation protrusion 12. FIG.
The tensile body 10 is configured by arranging in parallel tensile strength cords made of a steel cord or the like extending along the circumferential direction. On the other hand, the width direction reinforcement layer 11 is comprised by arranging in parallel the tensile cord which consists of a steel cord etc. in the direction inclined with respect to the circumferential direction. The reinforcing layer 11 can also be provided on the inner peripheral side of the tensile body 10 and on both the inner peripheral side and the outer peripheral side.
[0018]
As shown in FIG. 1, the drive sprocket 3 of this reference example includes a sprocket body 15 in which a large number of sprocket teeth 14 arranged at regular intervals in the circumferential direction are formed on the outer peripheral edge, and both sides of the outer periphery of the sprocket body 15. A pair of left and right drive pins 13 projecting from the surface, and the drive pins 13 are arranged at regular intervals at circumferential positions corresponding to the sprocket teeth 14.
On the other hand, the crawler body 8 of the elastic crawler 1 is provided with the drive sprocket 3 separately from the drive pin 13 in addition to the drive projection 7 (divided projection 12) with which the drive pin 13 is engaged. Drive holes 16 into which the sprocket teeth 14 are respectively fitted are formed in a state of being arranged at regular intervals in the circumferential direction. The drive hole 16 is constituted by a through hole that penetrates the crawler body 8 in the front and back direction, and is disposed at the center in the width direction of the crawler body 8. Further, the drive protrusion 7 (divided protrusion 12) and the drive hole 16 are disposed at positions shifted from each other in the circumferential direction.
[0019]
According to the elastic crawler 1 of this reference example having the above-described configuration, not only the drive pin 13 of the drive sprocket 3 engages with the drive projection 7 of the crawler body 8 but also the sprocket teeth 14 of the sprocket 3 The rotation of the drive sprocket 3 is also transmitted to the elastic crawler 1 by fitting in the drive hole 16. For this reason, since the load applied to the drive protrusion 7 is reduced compared to the case where power is transmitted only by the engagement of the drive sprocket 3 and the drive pin 13, even if the tension on the crawler body 8 is not increased more than necessary, The deformation of the driving protrusion 7 can be suppressed.
[0020]
Further, since the sprocket teeth 14 of the drive sprocket 3 are fitted in the drive holes 16 of the crawler body 8, the crawler body 8 is prevented from shifting in the width direction with respect to the drive sprocket 3, thereby preventing the elastic crawler 1 from being removed. Will improve. In particular, in the elastic crawler 1 of this reference example , as shown in FIG. 1A, the crawler body 8 is mounted on the sprocket 3 with the drive sprocket 3 sandwiched between the split protrusions 12 from the left and right. The main body 8 is more reliably prevented from shifting in the width direction with respect to the drive sprocket 3, and the function of preventing the elastic crawler 1 from being removed is further improved.
[0021]
Further, in the elastic crawler 1 of the present reference example , the drive hole 16 is constituted by a through-hole penetrating the crawler body 8 in the front and back direction. There is also an advantage that a pitch error due to mud and earth and sand adhering to the drive projection 7 can be prevented.
[0022]
FIG. 3 shows an elastic crawler 1 according to an embodiment of the present invention.
The elastic crawler 1 of the present embodiment is different from the reference example in that the drive protrusion 7 is shifted in the circumferential direction with respect to the drive hole 16 and in the width direction arranged at the center of the crawler body 8 in the width direction. consists continuous projection 17 consecutive and, correspondingly, the valley portion of the sprocket teeth 14 of the drive sprocket 3, Ru near that it is deeper by that the height of the drive projections 7 (continuous protrusion 17). That is, the drive protrusion 7 has a first portion where the sprocket teeth 14 are caught and a second portion where the drive pin 13 engages on both sides in the width direction of the first portion. The part consists of a continuous protrusion 17 that continues in the width direction. Other configurations are almost the same as those in the reference example.
[0023]
Therefore, the elastic crawler 1 of the present embodiment can obtain substantially the same operational effects as the elastic crawler 1 of the reference example (FIG. 1), and as shown in FIG. 3A, the sprocket teeth 14 of the drive sprocket 3 Is caught not only by the drive hole 16 but also by the drive protrusion 7, the pitch error of the elastic crawler 1 and the function of preventing the wheel removal can be further improved.
[0024]
As shown in FIG. 4B, in this type of elastic crawler 1, when the arrangement pitch P1 of the drive protrusions 7 is set to twice the lug pitch P2, the rigidity between the drive protrusions 7 and the lugs 9A is considerably high. A low thin portion 18 may occur, and when the crawler traveling device 2 rides on a step, a large local deformation may occur in the thin portion 18 and the elastic crawler 1 may be easily damaged.
[0025]
Therefore, before the elastic crawler 1 according to you facilities embodiment, as shown in FIG. 4 (a), placing the two in sequence tail part and the tail part of the lug 9A drive projections 7 wraps always in the circumferential direction Thus, the thin portion 18 as described above is prevented from being generated in the crawler body 8 .
[0026]
The above-described embodiments are all illustrative and not restrictive. The scope of the present invention is defined by the claims, and all modifications within the scope equivalent to the configurations described therein are also included in the present invention.
For example, as shown in FIG. 5 (b), a drive sprocket 24 in which the outer peripheral parts of a pair of left and right divided disks 28 are connected to each other by a drive pin 29 is adopted, and the outer peripheral edge part of each divided disk 28 is used. The sprocket teeth 14 may be formed. In this case, it is necessary to arrange the drive holes 16 in two rows on the left and right sides corresponding to the sprocket teeth 14 of the two divided disks 28.
[0027]
【The invention's effect】
As described above, according to the present invention, it is possible to suppress the deformation of the drive protrusion without increasing the tension on the crawler body more than necessary, so that it is possible to prevent pitch error and wheel removal without deteriorating fuel consumption. it can.
[Brief description of the drawings]
1A is a cross-sectional view of an elastic crawler of a reference example , and FIG. 1B is a perspective view showing an engagement state between the crawler and a drive sprocket.
FIG. 2 is a side view of a crawler traveling device equipped with the elastic crawler.
3A is a cross-sectional view of an elastic crawler according to an embodiment of the present invention , and FIG. 3B is a perspective view showing an engaged state of the crawler and a drive sprocket.
4 (a) is a side sectional view of the elastic crawler of the above you facilities form a side cross-sectional view of the elastic crawler according to (b) is a comparative example.
FIG. 5 is a cross-sectional view showing an engagement state between a conventional elastic crawler and a drive sprocket.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Crawler traveling device 3 Drive sprocket 4 Idler 5 Roller wheel 7 Drive protrusion 8 Crawler main body 9 Lug group 10 Tensile body 12 Split protrusion 13 Drive pin 14 Sprocket tooth 16 Drive hole 17 Continuous protrusion

Claims (4)

Drive protrusions (7) provided on the drive sprocket (3) projecting on both sides in the width direction are engaged with the drive protrusions (7) so as to protrude from the inner peripheral surface in a state of being arranged at regular intervals in the circumferential direction. A crawler main body (8) made of a rubber-like elastic body, a lug group (9) formed in a predetermined lug pattern on the outer peripheral surface of the crawler main body (8), and a circumferential direction inside the crawler main body (8) An elastic crawler without a mandrel comprising a tensile body (10) embedded along
The crawler body in a state in which drive holes (16) into which the sprocket teeth (14) provided in the drive sprocket (3) are arranged separately from the drive pins (13) are arranged at regular intervals in the circumferential direction. Formed in (8),
At the position where the drive protrusion (7) is displaced in the circumferential direction with respect to the drive hole (16), the drive is performed on the first portion where the sprocket teeth (14) are caught and on both sides in the width direction of the first portion. An elastic crawler having a second portion with which the pin (13) engages, and the first and second portions are formed of continuous protrusions (17) continuous in the width direction.   The elastic crawler according to claim 1, wherein the drive hole (16) is a through hole that penetrates the crawler body (8) in the front and back direction. The elasticity according to claim 1 or 2, wherein the drive hole (16) is disposed at the center in the width direction of the crawler body (8), and the continuous protrusion (17) is disposed at the center in the width direction of the crawler body (8). Crawler. In a crawler traveling device including a drive sprocket (3), an idler (4), a plurality of wheels (5), and an elastic crawler wound around the outer periphery thereof,
The elastic crawler comprises the elastic crawler (1) according to any one of claims 1 to 3, wherein the drive sprocket (3) protrudes on both sides in the width direction, and the continuous protrusion (17) of the elastic crawler (1). And a drive pin (13) that engages with the drive hole (16) of the crawler (1) and a sprocket tooth (14) that is hooked on the continuous protrusion (17). Crawler travel device.

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