JP4283960B2 - Structure to prevent overload transmission of snowplow - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an overload transmission preventing structure in a snowplow.
[0002]
[Prior art]
A snow remover that sucks snow squeezed by an auger provided in front of the machine body with a slater disposed behind the auger and discharges it with a shooter that stands up from the slower is already well known. In this type of snowplow, rocks, wood chips, etc. often get stuck in the auger when mixed with snow, and an overload may be generated and the drive system may be damaged. For this reason, an overload transmission prevention structure is required, but generally, an overload transmission prevention structure is like a slip type torque limiter.
[0003]
[Problems to be solved by the invention]
This type of torque limiter automatically returns to its original state when the overload condition is over, and thus does not require a return operation, but has the disadvantages of high cost and unstable operation. In addition, often when an overload condition occurs, the sliding plate is seized and damaged. In view of this, there is one that employs a simple overload transmission prevention structure using shear bolts that preferentially breaks when an overload is applied (Japanese Patent Laid-Open No. 8-013439).
[0004]
According to the shear bolt, overload transmission can be reliably prevented at a low cost, but once the shear bolt is broken, this must be replaced. In other words, after removing the broken shear bolt, it is necessary to align the position of the through hole of the shear bolt that is out of phase, pass the new shear bolt through it, and then screw the nut into it. It is troublesome. In particular, since these members are incorporated in a narrow space, it is very difficult to replace them.
[0005]
In particular, in order to screw the nut onto the shear bolt, the spanner must be moved many times. In some cases, the spanner may not be able to perform this operation because it hits another member. The present invention solves such a problem and adopts a shear pin. However, it does not require a tool such as a spanner and can perform these operations easily and quickly.
[0006]
[Means for Solving the Problems]
In the present invention, the auger mounting shaft in which the auger body is attached to the forcedly driven auger shaft is flange-joined, a hole is formed between both flanges, and the auger body is overloaded through the shear pin. In the structure for preventing overload transmission of a snowplow that breaks when applied, a head having a diameter larger than the hole diameter is formed at one end of the shear pin so that the head does not come out on one side, and the head is on the head side. of and holding an shall around rotatable presser lever fulcrum shaft provided on the flange, the recess in the pressing lever be formed is intended to press in a state in which the head is fitted into the recess The present invention provides a structure for preventing overload transmission of the snowplow as a feature.
[0007]
Since the shear pin used in the present invention is not a bolt but a pin having a large-diameter head at one end, a nut screwing operation is not required. On the other hand, a structure for preventing the head from coming off is required, but this depends on a presser lever that can rotate around a fulcrum shaft provided on a flange through which the shear pin passes. Therefore, since the presser lever can be operated to replace the shear pin, no tool is required and the time required for loading is short.
[0008]
Further, according to the present invention, an auger mounting shaft in which an auger body is attached to a forcedly driven auger shaft is flange-connected, a hole is formed between both flanges, and an overload is applied to the auger body through a shear pin in this hole . In the structure for preventing overload transmission of a snowplow that is sometimes broken, a head having a diameter larger than the hole diameter is formed at one end of the shear pin so that it does not come out on one side, and holes on both flanges are formed on the tail side. A snow removal machine characterized by forming a large-diameter portion that can be passed and locking the pin holder held by the flange on the opposite head side to the stepped portion so that it cannot be pulled out to the other side. Provide a load transmission prevention structure.
[0009]
This means relies on a pin holder instead of a presser lever to prevent the shear pin from coming off to the head side. However, since the pin holder is light in weight, it causes an unbalance in the rotating shaft to which it is attached. Does not generate vibration. Moreover, since only a pin holder is used and an accompanying structure is not required, the price is extremely low. When the broken shear pin is pulled out, it can be easily pulled out by pulling in both directions on the head side and the tail side.
[0010]
Furthermore, in the present invention, the above-described auger shaft is driven by a drive shaft, and a rotating blade is attached to the drive shaft so that the snow scraped by the auger body jumps off toward the shooter. Means are provided in which a structure is also provided between the drive shaft and the rotating blades. The reason why an overload is applied by biting a stone or the like is the same for the rotary blade, so that an overload is prevented from being applied to the blade to avoid the damage.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 9 is a side view of a snowplow showing an example of the present invention, and this snowplow is composed of a main body 1 and a snow removal portion 2 disposed in front of the main body 1. The main body 1 forms a box 4 on which a crawler 3 is suspended, and an engine 5 and the like are accommodated in the box 4 and a steering handle 6 projects from the rear.
[0012]
The snow removal unit 2 includes an auger 7 that rakes snow toward the center, a slot 8 that sucks the raked snow and jumps it to a shooter, which will be described later, and a shooter 9 that guides the snow jumped off by the slot 8. The 7 is a side cross-sectional view of the snow removal portion 2, and FIG. 8 is a partial cross-sectional front view. In this case, the auger 7 has an auger shaft 11 mounted on a horizontally long cover 10 that opens forward. An auger body (spiral screw) 12 is attached to 11.
[0013]
On the other hand, the drive shaft 13 extends from the main body 1 in the center of the cover 10 and is connected to the auger shaft 11 by extending forwardly in the lower housing portion 14 connected to the rear thereof. A rotating blade 15 is attached to the drive shaft 13 in the lens 14 to form a throttle 8. Accordingly, when the power of the engine 5 is transmitted to the drive shaft 13 by the pulley belt mechanism 16 or the like, and the power of the drive shaft 13 is transmitted to the auger shaft 11 by the worm mechanism 17 or the like, the spiral screw 12 is rotated and squeezes snow. The rotary blade 15 sucks this. At this time, the spiral direction of the spiral screw 12 is formed symmetrically with respect to the center, and the snow is scraped to the center side by rotation in a specific direction.
[0014]
A guide cylinder 18 extending upward is provided at a position eccentric to the side where the blower is blown off by the blower 8 among the side parts of the drawer housing section 14, and the upper end of the guide cylinder 18 is opened to open the opening 18a. Forming. Therefore, if the shooter 9 is connected to the opening 18a, the snow sucked by the rotary blade 15 is guided to the shooter 9 through the guide tube 18. The shooter 9 in this case is a duct body 19 which is configured by a rear wall 19a and both side walls 19b which are curved forward and forms an open portion 19c in the front. An arc that follows the shape of the duct body 19 is drawn and thrown from the opening 19c.
[0015]
By the way, the duct body 19 of this example is divided into a first step portion 19A to a fourth step portion 19D from the bottom, and the first step portion 19A is a seat 18b formed at the upper end of the guide tube 18. It is mounted so that it can turn. That is, a gear 20 is attached to the outer periphery of the first step portion 19A, and this gear 20 is driven by a pinion 22 driven by a motor 21 or the like. This is because the direction of the duct body 19 is changed to adjust the snow throwing direction. In this example, this can be performed by remote control.
[0016]
On the other hand, the second step portion 19B is connected by a hinge mechanism 23 provided at the front portion above the first step portion 19A. Hereinafter, the third step portion 19C is connected to the second step portion 19B, and the fourth step portion 19D is connected to the fourth step portion 19D. The third stage 19C is connected by hinge mechanisms 24 and 25 provided at the rear part. Therefore, the second step portion 19B or more can be bent, but the bending above the second step portion 19B lowers the overall height by causing the shooter 9 to fall down. It takes into account the convenience of storage. Therefore, the height of the bent portion (hinge mechanism 23) is set to be approximately the same as that of the main body portion 1, and the upper portion can be bent with a lower posture. This bending operation is performed manually by removing the clasp mechanism 23a provided on the opposite side of the hinge mechanism 23.
[0017]
On the other hand, the bending of the third step portion 19C and the fourth step portion 19D is to adjust the snow throwing angle by adjusting the bending angle. In the case of this example, the bending of the fourth step portion 19D with respect to the third step portion 19C and the bending of the third step portion 19C with respect to the second step portion 19B are automatically performed in conjunction with each other. That is, the link 26 is stretched between the fourth step portion 19D and the second step portion 19B, and this link 26 is further moved to another link 28 that is moved up and down by the rotation of the cam 27 provided in the second step portion 19B. Are connected.
[0018]
Therefore, when the cam 27 is driven by the motor 29 or the like, the links 26 and 28 cooperate to make the fourth step portion 19D and the third step portion 19C independent of the third step portion 19C and the second step portion 19B, respectively. Then it will be bent (Fig. 7). A spring 30 is stretched between the fourth step portion 19D and the second step portion 19B to absorb backlash. In this case, each bending angle can be set arbitrarily and can be optimized according to the anchoring place.
[0019]
By the way, in the present invention, an overload transmission prevention mechanism is incorporated in the drive system of each part such as the drive shaft 13, the auger 7, or the drawer 8, so that when an overload is applied, it is released to avoid damage to each part. Is. FIG. 1 is a longitudinal sectional view of a main part of an auger shaft 11 showing an example of the present invention. The drive structure of the auger 7 in this example is that a drive sleeve 32 having a flange 31 formed on the auger shaft 11 is fixedly fitted. The auger mounting shaft 34 provided with the spiral screw 12 is loosely fitted on the outer periphery where the flange 33 to be abutted with the flange 31 is formed, and the holes 31a and 33a are formed in both the flanges 31 and 33 to thereby form the holes 31a, The power is transmitted through the shear pin 35 to 33a.
[0020]
Thereby, when an overload is applied to the spiral screw 12, the shear pin 35 is broken to prevent transmission of the overload. Note that the load to be overloaded can be arbitrarily set by adjusting the thickness of the shear pin 35 and the like. Since a large-diameter head 35a is formed at one end of the shear pin 35 in this case, the shear pin 35 can be removed in the direction of the head 35a (in the direction of the drive sleeve 32 in this example). Therefore, some kind of retaining mechanism is required. In this example, the head 35a is held by the presser lever 37 that can rotate around the fulcrum shaft 36 provided on the flange 33 on the head 35a side. I'm trying to stop.
[0021]
2 is a sectional view taken along the line AA in FIG. 1 and FIG. 3 is a view taken in the direction of arrow B in FIG. 1. The presser lever 37 is movably fitted to a fulcrum shaft 36 protruding from the drive sleeve 32. The outer end side is fastened and fastened with a nut 51 via a disc spring 50. In addition, a concave portion 37 a into which the head portion 35 a of the shear pin 35 is fitted is formed at one end of the presser lever 37. As a result, when the other end side of the presser lever 37 is held and pushed by hand, the presser lever 37 rotates about the fulcrum shaft 36, and accordingly, the recessed portion 37 a is fitted to or removed from the head 35 a. To do.
[0022]
That is, when the holding lever 37 is lifted by holding the other end side, the recessed portion 37a is disengaged from the head portion 35a against the force of the disc spring 50, and is fitted when the reverse operation is performed. When fitted, the state is maintained by the action of the disc spring 50, and it is difficult to come off due to the rotation of the presser lever 37 accompanying the rotation of the drive sleeve 32. Further, when the holding lever 37 of this example is rotated with the other end side, the presser lever 37 hits a groove 52 formed in a corresponding portion of the drive sleeve 32 on one side and the other end portion itself on the other side. The outer periphery of the drive sleeve 32 is prevented from rotating further.
[0023]
In addition, a portion of the shear pin 35 that extends over both the flanges 31 and 33 is formed in the diameter detail 35b, and the diameter detail 35b is preferentially broken when an overload is applied. By doing so, the burrs and the like that are generated when it breaks do not damage the holes 31a, 31a, and the removal becomes easy. The operation of removing the shear pin 35 broken at the diameter detail 35b may be performed by removing the presser lever 37 on the head 35a side and pulling in that direction, or by pulling the counter head 35a side as it is (anti-reverse). The head 35a side is naturally pushed out by inserting a new shear pin 35). Then, if the new shear pin 35 is passed through the holes 31a and 33a of the flanges 31 and 33 and the presser lever 37 is operated to fit the recessed portion 37a into the head portion 35a, the replacement operation is completed. In this case, a tool such as a spanner is not required, and the replacement work is quick and easy.
[0024]
FIG. 4 is a cross-sectional view of the main part showing another example of the overload transmission preventing mechanism, and FIG. 5 is a cross-sectional view of FIG. 4 taken along the line C-O-C. Instead of the presser lever, a pin holder 38 is used. In this example, a push nut which is a kind of disc spring is illustrated as the pin holder 38, and a holder 40 for holding the pin holder 38 in the pocket 39 on the outside of one of the flanges 31 and 33 is a bolt or the like. The shear pin 35 is sewn with 41 and the shear pin 35 is fastened with the pin holder 38. In this case, the outer portion of the shear pin 35 is slightly formed with a large-diameter portion 35c (so that it can be overcome when inserted) to prevent the shear pin 35 from being pulled out. It is prevented by the head 35a). The diameter detail 35b is formed at a specific portion of the shear pin 35 as described above.
[0025]
In this case, the shear pin 35 can be easily replaced by pulling the broken shear pin 35 on both the head 35a side and the non-head 35a side in the same direction. Since it only needs to be pushed in to pass, the operation is very simple and quick. Since the present example only depends on the lightweight pin holder 38 and does not require any other structure, there is an advantage that the price is low and vibration or the like does not occur during rotation.
[0026]
FIG. 6 is a longitudinal cross-sectional view of the main part of the example in which the above-described overload transmission preventing mechanism is applied to the slot 8. The drive sleeve 43 having the flange 42 is fixedly fitted to the drive shaft 13 and the rotary blade 15 is attached. A flange 45 that abuts against the flange 42 is formed on the lower mounting shaft 44 and is loosely fitted, and a shear pin 35 is inserted between the flanges 42 and 45. Since the overload may also be applied to the slot 8, damage to the rotary blade 15 and the like at this time is prevented. In this case, the shape and stop structure of the shear pin 35 may be any of the above examples (in this example, the above-described pin holder 38 is shown).
[0027]
Further, the overload transmission preventing mechanism may be incorporated in the pulley belt mechanism 16 that receives the power of the engine 5. In this example, among the members constituting the pulley 46, the pulley portion 46a that receives the belt and the hub portion 46b that is fitted to the drive shaft 13 are divided, and the pulley portion 46a is sandwiched between the hub portions 46b from both sides. The clamping force is adjusted by a disc spring 47. Since the drive shaft 13 may be overloaded, the pulley portion 46a slips with respect to the hub portion 46b to avoid this. Note that the overload transmission preventing mechanism of this example returns to the original state when the overload state is removed, so that a return operation such as replacement of the shear pin is not necessary.
[0028]
【The invention's effect】
As described above, according to the present invention, since a shear pin is used for the overload transmission preventing structure for preventing an overload from being applied to the drive system of the snowplow, it is possible to implement a reliable function at a low cost. In addition, since the shear pin used here is not a bolt but a pin having the above-described retaining structure, a nut screwing operation is not required. Therefore, no tool is required to replace the shear pin, and the time required for loading can be shortened.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part of a drive shaft showing an example of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a view taken in the direction of arrow B in FIG. 1;
FIG. 4 is a cross-sectional view of a main part of a drive shaft showing another example of the present invention.
5 is a cross-sectional view taken along the line C-O-C in FIG. 3;
FIG. 6 is a longitudinal sectional view of a main part of a drive shaft showing another example of the present invention.
FIG. 7 is a side sectional view of a snow removal portion showing an example of the present invention.
FIG. 8 is a partial cross-sectional front view of a snow removal portion showing an example of the present invention.
FIG. 9 is a side view of a snowplow showing an example of the present invention.
[Explanation of symbols]
7 auger 11 auger shaft 12 auger body 13 drive shaft 15 rotary blade 31 flange 31a hole 33 flange 33a hole 34 auger mounting shaft 35 shear pin 35a diameter portion of head 35b〃 diameter detail 35c 径 diameter larger portion 37 presser lever 37a〃 Recessed part 38 Pin holder

Claims (4)

A snow remover that joins an auger mounting shaft with an auger body to a forced-driven auger shaft with a flange , forms a hole between the two flanges, and breaks it when an overload is applied to the auger body through a shear pin in this hole In the overload transmission preventing structure, a head having a diameter larger than the hole diameter is formed at one end of the shear pin so that the head does not come out on one side, and the fulcrum shaft provided on the flange on the head side and pressing a shall in rotatable pressing lever around, overload snowplow which recess the pressing lever be formed and characterized in that the pressing in a state where the head is fitted into the recess Transmission prevention structure. A snow remover that connects an auger mounting shaft with an auger body to a forced-driven auger shaft by flange , forms a hole between both flanges , breaks the auger body through a shear pin, and overloads the auger body In the overload transmission preventing structure of the above, the shear pin is formed with a head having a diameter larger than the hole diameter at one end so as not to come out on one side, and a large diameter part capable of passing through the holes of both flanges on the tail side. A structure for preventing overload transmission of a snowplow, wherein a pin holder that is formed and locked to a flange on the side opposite to the head is prevented from coming out to the other side by locking the pin holder. An auger shaft is driven by a drive shaft, and a rotating blade is attached to the drive shaft to cause the snow scraped by the auger body to jump toward the shooter. The overload transmission preventing structure according to claim 1 or 2 Overload transmission prevention structure for snowplows that is also provided between the shaft and the rotating blades. 4. The structure for preventing overload transmission of a snowplow according to any one of claims 1 to 3 , wherein, between the diameters of the shear pins, a portion between the flanges is formed in a diameter detail, and the diameter detail is preferentially broken.

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