JP4193208B2 - Torque releaser reset device. - Google Patents

Description

  The present invention relates to a torque releaser reset device used in an auger drive system of a rotary snowplow.

  As shown in FIGS. 1 and 2, the rotary snowplow 1 has a snow removal device 6 including an auger 3, a blower 4, a chute 5, and the like at the front part of a vehicle body 2. The snow accumulated in the section is put on the air flow generated by the blower 4 and thrown from the chute 5 to an appropriate place outside the road.

  The transmission of power to the snow removal device 6 may be performed using a mechanical transmission device or a hydraulic device. As a typical example, a rotary snowplow 1 using a hydraulic device for power transmission will be described as an example.

  FIG. 9 is a schematic diagram showing a drive system of the auger 3 and the blower 4 of the rotary snowplow 1 using a hydraulic device for power transmission to the snow removal device 6. The engine 12 and the hydraulic pump 13 are mounted on the vehicle body 2, and the hydraulic motor 14 and the transmission 15 are mounted on the snow removal device 6. The hydraulic pump 13 and the hydraulic motor 14 are connected by a hydraulic hose 18. That is, the power generated in the engine 12 is converted into high-pressure hydraulic energy by the hydraulic pump 13, and this high-pressure oil pressure is led to the hydraulic motor 14 installed in the snow removal device 6 by the hose 18 to be converted back into the rotational power of the shaft. Yes. The rotational power of the hydraulic motor 14 is used to drive the blower 4 by a transmission 15 and is transmitted to a chain transmission 17 via a coupling shaft joint 16 such as a universal joint, and further to the auger shaft 3a via the chain transmission 17. It is to be transmitted.

  In such a drive system, when the auger 3 bites, for example, stones or ice blocks, an abnormally large torque is generated, and a large force acts on the engine 12 or the transmission 15 to cause a failure. Therefore, normally, the auger shaft 3a is provided with a torque limiting device 50 that limits the upper limit of the transmission torque.

  Conventionally, as a torque limiting device 50 mounted on the auger shaft 3a of the rotary snowplow 1, a shear pin method, which is a well-known technique, has been widely adopted because of its simple configuration. As shown in FIG. 9, the torque limiting device 50 is mounted between the output shaft 17b of the chain transmission 17 that transmits power to the auger shaft 3a and the auger shaft 3a. Is to be sheared to limit the transmission torque.

However, although the shear pin torque limiting device 50 has the advantage of being inexpensive, as described above, since the shear pin is installed between the output shaft 17b of the chain transmission 17 and the auger shaft 3a, the torque is limited. The recovery work was complicated if the shear pin broke beyond the limit. In addition, there is a drawback that it takes a long time to restart the snowplow 1. Therefore, a snowplow using a torque limiter that can be reset without using a shear pin has also been proposed. (For example, refer to Patent Document 1).
JP 08-159234 A

  As described above, the shear pin as the torque limiting device has an advantage that the configuration is simple and inexpensive, but once the shear pin is cut, there is a problem that it takes time to replace the shear pin. In particular, when a shear pin is used for the auger drive shaft of a rotary snow plow, the snow plow is active during the severe winter season when there is a lot of snow, and the shear pin must be replaced after removing snow from the surrounding area. However, the work is difficult due to the cold in the field, and the fingertips are also inconvenient, so the work efficiency is reduced. In addition, there is a disadvantage that a working tool such as a spare shear pin or spanner must be prepared in advance.

  On the other hand, according to the torque limiting device disclosed in Japanese Patent Application Laid-Open No. 08-159234, the time required for the reset operation after the limiting torque operation is not so much as necessary for exchanging the shear pin, but the auger is manually rotated. Reset operation is required. There was still room for improvement in terms of being forced to work outdoors in the severe winter season.

  The present invention has been made in view of the above-described problems of the prior art. When a load exceeding a predetermined limit torque is applied to the auger shaft, the torque is surely limited. It is an object of the present invention to provide a torque releaser reset device that can be reset by a remote operation from a driver's seat without a manual operation even after the operation of the torque releaser.

  According to a first aspect of the present invention, there is provided a snowplow for removing snow by blowing away snow accumulated by rotating an auger together with an air flow generated by a blower, and attaching a torque releaser to a drive system of the auger. The reset operation after the torque limiting operation can be operated from the driver's seat.

Invention of claim 1, wherein, in a reset device bets Rukurerisa, a torque releaser mounted between the connecting joint and the input shaft of the chain transmission device for transmitting power to the auger shaft, the outer periphery of the connecting joint The drum is supported on the outside by a support provided on the housing of the snow removal device, a yoke is provided in an annular groove provided on the outer peripheral surface of the drum, and a swing shaft of the yoke is provided on the housing of the snow removal device. The first lever is fixed to the pivot shaft of the yoke, and the other end of the first lever can be operated by an operation from the driver's seat. The other end of the connecting rod is pivotally supported by one end of a second lever whose pivot is pivotally supported by the housing of the snow removal device, and the pressing body fixed to the other end of the second lever is torqued. Releaser hula It is characterized in that the pressing di.

Invention according to claim 2, in which the reset device of the torque releaser of claim 1 Symbol placement, and performing by said first lever operates the transmission cable.

According to a third aspect of the invention, in which the reset device of the torque releaser of claim 1 Symbol placement, and performing operation of the first lever by a hydraulic cylinder.

According to the reset device of the torque releaser of claim 1 Symbol placement, it is possible to remotely operate the reset operation of the torque releaser from the driver's seat, it is possible to perform the reset operation of the torque releaser without leaving the field. Therefore, it is possible to provide a snow plow with safety and reliability and excellent workability. Moreover, since the time required for the reset operation of the torque releaser is shortened, the efficiency of snow removal work is improved.

According to the torque releaser reset device of the second aspect, since the torque releaser reset device can be realized by a simple operation mechanism, an inexpensive torque releaser reset device can be provided.

According to the torque releaser reset device of the third aspect, even a torque releaser having a large torque capacity can obtain a large operating force by hydraulic drive and can be reset, so that it can be applied to a large snowplow. it can.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is an external side view of a rotary snowplow equipped with a torque releaser reset device according to the present invention, and FIG. 2 is an external plan view of a rotary snowplow equipped with a torque releaser reset device according to the present invention. FIG. 3 is a view showing a drive system of the auger 3 and the blower 4 of the rotary snowplow 1 to which the reset device 10 of the torque releaser 11 according to the present invention is applied.

  As shown in FIGS. 1 to 3, the rotary snowplow 1 has a snow removal device 6 including an auger 3, a blower 4, a chute 5, and the like at the front portion of the vehicle body 2, and the auger 3 is rotated and stacked on the road. The snow is collected in the central part of the auger 3, put on the air flow generated by the blower 4, and thrown into an appropriate place off the road from the chute 5.

  A torque releaser 11 resetting device 10 according to the present invention is configured to rotate a helical ribbon-shaped auger 3 to blow away snow accumulated by an air flow from a blower 4 to remove snow, and to provide torque to a drive system of the auger 3. The releaser 11 is mounted, and the reset operation after the torque limiting operation of the torque releaser 11 can be performed from the driver's seat 7.

  The snow removal device 6 is manufactured separately from the vehicle body 2 and is attached to the vehicle body 2 by a holding device 8 such as a hydraulic cylinder. By configuring the snow removal device 6 and the vehicle body 2 as separate bodies in this way, a versatile vehicle body can be used as the vehicle body, and the vehicle body can be used for other purposes during periods when snow removal is not necessary except in winter. There is a merit that it can be diverted to make effective use of materials.

  The drive system of the auger 3 and blower 4 shown in FIG. 3 corresponds to the drive system of FIG. 9 shown as a conventional example. An engine 12 and a hydraulic pump 13 driven by the engine 12 are mounted on the vehicle body 2. On the other hand, the hydraulic motor 14, the transmission 15, the blower 4, the coupling shaft joint 16, the torque releaser 11, the chain transmission 17 and the auger 3 are mounted on the snow removal device 6. The hydraulic pump 13 and the hydraulic motor 14 are connected by a high-pressure hydraulic hose 18a, and the return oil from the hydraulic motor 14 is also connected to an oil reservoir (not shown) mounted on the vehicle body by the hydraulic hose 18b. It is designed to circulate in the devices that make up the circuit. However, a mechanical transmission device can also be used without using a hydraulic device for power transmission between the vehicle body 2 and the snow removal device 6 as in this embodiment. However, the configuration using the hydraulic motor 14 as in the present embodiment has the advantage that the degree of freedom in the positional relationship between the vehicle body 2 and the snow removal device 6 is greater and the convenience in handling is improved.

  The high-pressure hydraulic energy generated by the hydraulic pump 13 is converted into rotational movement of the shaft by the hydraulic motor 14. A transmission 15 is connected to the shaft of the hydraulic motor 14, and the rotational driving force transmitted to the transmission 15 is distributed to the two shafts 15a and 15b inside the transmission 15. One of the two rotating shafts 15a is used for driving the blower 4. The other rotary shaft 15b is connected to the driving side 19a of a pair of flange joints 19 to which the torque releaser 11 is attached via a coupling shaft joint 16 capable of absorbing misalignment. Of the pair of flange joints 19, the driven side flange 19 b is connected to the input shaft 17 a of the chain transmission 17. With such a configuration, even when an obstacle is caught in the auger 3, the device can be protected by preventing an overload from acting on the device. A transmission gear train is built in the transmission 15 so that the rotational speeds of the two output shafts 15a and 15b are changed to appropriate rotational speeds of the blower 4 and the auger 3.

  The chain transmission 17 is a transmission device for driving the auger shaft 3a with a distance between the axes required for installing the auger 3, and when the distance between the two shafts connected by the chain becomes long, the chain transmission is appropriately performed. A chain tension adjusting mechanism for adjusting the tension is provided. Further, since the snow removal device 6 is used in winter in a snowy country, the housing of the chain transmission 17 has a sealed box structure so that the chain is not exposed to the outside.

  The auger 3 is a single auger shaft 3a in which a pair of helical ribbon-shaped rotating bodies with different twist directions are mounted in an axially symmetrical manner. When the auger shaft 3a is rotated, snow on the road surface The auger 3 is rotated and collected at the center of the snow removal device 6. The collected snow is then discharged from the chute 5 by the air flow generated by the blower 4.

  The torque set value of the torque releaser 11 is set to a value that satisfies the power required for normal snow removal and does not damage the auger drive system equipment. If the torque setting value is too low, the risk of damaging the auger drive system equipment is reduced, but if it is too low for the power required to drive the auger 3, the torque relay 11 will be operated more frequently and handled. The above complexity is inevitable. On the other hand, if the torque set value is too high, the frequency at which the torque relay 11 operates is reduced, but the risk of damaging the drive system equipment increases. Therefore, the torque setting value of the torque relay 11 is set in consideration of the power required for driving the auger 3 and the strength margin of the drive system equipment.

  Next, an embodiment of the reset device 10 for the torque releaser 11 according to the present invention will be described with reference to FIGS. 4 is an external view showing the main part of the reset device 10 of the torque releaser 11, FIG. 5 is a structural view showing the mounting state of the torque releaser 11, FIG. 6 is a structural view of the torque relay 11 used in this embodiment, and FIG. 4 is an AA arrow view in FIG. 4, and FIG. 8 is a BB arrow view in FIG.

  A reset device 10 for a torque releaser 11 according to the present invention includes a torque releaser 11 mounted between an input shaft 17a of a chain transmission 17 for transmitting power to an auger shaft 3a and a connecting shaft joint 16, and the connecting shaft joint. The drum 21 is pivotally supported on a support body 22 provided on the housing of the snow removal device 6 on the outer periphery of the snow removal device 6, and a yoke 22 is disposed in a circumferential groove 21 a provided on the outer peripheral surface of the drum 21. The pivot shaft 22a is pivotally supported on a bearing 23 provided in the housing of the snow removal device 6, and one end of the first lever 24 is fixed to the pivot shaft 22a of the yoke 22, and the other end 24b of the first lever 24 is Operation is possible from the driver's seat 7, one end 25 a of the connecting rod 25 is rotatably mounted on the side surface of the yoke 22, and the other end 25 b of the connecting rod 25 is pivotally supported on the housing of the snow removal device 6. Pivoted to one end 26a of the second lever 26 and fixed to the other end 26b of the second lever 26 And it performs a reset torque releaser 11 the pressing member 27 is pressed against the driven-side flange 19b of the torque releaser 11.

  As shown in FIG. 4, a pair of flange joints 19 to which a torque releaser 11 is attached are incorporated between a connecting shaft joint 16 that transmits power from the transmission 15 and an input shaft 17 a of the chain transmission 17. ing. As shown in FIGS. 5 and 6, the torque releaser 11 is attached to the driving side flange 19a of the pair of flange joints 19 facing each other, and is attached to the driven side flange 19b by a disc spring 31. Power is transmitted through the sphere 32 that is energized. Here, the torque transmitted from the driving side flange 19a to the driven side flange 19b can be arbitrarily set by the biasing force of the disc spring 31 that presses the sphere 32. When a torque exceeding the set value is applied, the sphere 32 is pushed back against the urging force of the disc spring 31, and torque transmission between the two flanges is interrupted.

  As shown in detail in FIG. 6, the torque releaser 11 has a structure in which a thrust bearing 34, a plunger 35, a disc spring 31, an adjustment nut 37, a bush 38, and a sphere 32 are incorporated in a torque relay housing 33. These are integrally mounted on the driving side flange 19a. A pressing body 39 that presses the sphere 32 is attached to the driven side flange 19b. In such a configuration, when an overload torque acts on the driven flange 19b, the sphere 32 moves in the direction in which the disc spring 31 is compressed, and the sphere 32 and the pressing body 39 are engaged when the set torque limit is exceeded. Will be canceled. In this way, torque transmission between the pair of flange joints 19a and 19b is interrupted.

  Further, in the torque releaser 11 used in the present embodiment, when an overload torque acts on the auger shaft 3a and torque transmission is interrupted, the tip 35a of the plunger 35 of the torque releaser 11 projects in the axial direction. Thereafter, to reset the torque releaser 11, the rotational angle of the two flanges 19a and 19b is changed to a position where the spherical body 32 engages with the pressing body 39, and the tip 35a of the plunger 35 of the torque releaser 11 is pushed back to return the spherical body. 32 must be stored in place. An object of the present invention is to perform such a reset operation of the torque releaser 11 by an operation from the driver's seat 7 on the vehicle body 2.

  That is, the drum 21 is provided outside the outer periphery of the coupling shaft joint 16 so as to face the tip end portion 35a of the plunger 35 of the torque releaser 11. The drum 21 is rotatably supported by a support 20 provided on the housing of the snow removal device 6 via a slide bearing 41. Further, since there is an opportunity for the tip 35a of the plunger 35 of the torque releaser 11 to come into contact with and slide on the side surface of the drum 21, the side plate facing the plunger 35 of the torque releaser 11 is lined with a low friction material. 42 is installed. An annular groove 21a is formed on the outer peripheral surface of the drum 21, and a yoke 22 is loosely fitted in the annular groove 21a. The swing shaft 22a of the yoke 22 is supported by the housing of the snow removal device 6 and is swingable. Further, one end 24a of the first lever 24 is fixed to the swing shaft 22a, and the other end 24b of the first lever 24 is connected to the transmission cable 43. Therefore, when the transmission cable 43 is pulled from the driver's seat 7 by operating the first lever 24, the yoke 22 operates. One end 25a of a connecting rod 25 is rotatably mounted on the side surface of the yoke 22, and the other end 25b of the connecting rod 25 is a second lever 26 whose fulcrum is rotatably supported by the housing of the snow removal device 6. It is connected with one end of this so that rotation is possible. Further, a pressing body 27 that presses the driven flange 19b of the torque releaser 11 is attached to the other end of the second lever. Therefore, when the transmission cable 43 is pulled from the driver's seat 7, the movement of the transmission cable 43 operates the pressing body 27 via the first lever 24, the yoke 22, the connecting rod 25, and the second lever 26. The driven flange 19b is pressed.

  Next, a method for resetting the torque relay 11 will be described. When overload torque acts on the auger 3 and the torque releaser 11 operates, first, the rotation by the hydraulic motor 14 is stopped to remove obstacles such as ice blocks sandwiched between the auger 3. Thereafter, the transmission cable 43 is operated from the driver's seat 7 as described above to operate the first lever 24 in the direction of the arrow shown in FIG. Then, the yoke 22 swings in the arrow direction by the operation of the first lever 24, and the drum 21 is moved in the arrow direction. As a result, the plunger tip 35a of the torque releaser 11 is pushed in the pushing direction by the sliding plate 42 attached to the drum 21. However, in this state, since the sphere 32 in the torque releaser 11 is in contact with the end face of the driven flange 19a, the distal end portion 35a of the plunger cannot move even if pressed. On the other hand, when the yoke 22 swings, the pressing body 27 presses the driven-side flange 19b through the operation of the connecting rod 25 connected to the side surface of the yoke 22 and the second lever 26. In this state, the hydraulic motor 14 is slowly rotated to turn the driving side flange 19a by the connecting shaft coupling 16. Then, since the connection between the two flanges 19a and 19b is released by the torque releaser 11, the driving side flange 19a rotates, but the driven side flange 19b is pressed by the pressing body 27 and is in a braked state. So it will stay in its position without rotating. Therefore, the relative rotation angle between the two flanges 19a and 19b gradually changes, and if the relative rotation angle between at least the two flanges 19a and 19b changes by 360 degrees, the sphere 32 of the torque releaser 11 will always be in contact with the driven flange 19b. To the position of the bush 39 having a spherical housing hole. That is, the spherical body 32 is accommodated in the accommodation hole of the bush 39, and the torque releaser 11 is reset. When the torque releaser 11 is reset, the tip portion 35a of the plunger 35 of the torque releaser 11 is also moved, so that the drum 21 is also moved in the axial direction. Therefore, it is possible to easily recognize that the torque releaser 11 has been reset by detecting the movement of the drum 21 with a proximity switch or the like (not shown).

  When two torque releasers 11 are mounted on the flange 19 at an interval of 180 degrees, the relative position of the flange that can be reset is realized by rotating the connecting shaft coupling 16 about 1/2 turn. The time required for the reset operation can be completed in a very short time. When the reset is completed, the transmission cable 43 is loosened from the driver's seat 7 so that the pressing body 27 is positioned away from the driven flange 19b, and the normal operation mode is entered. In order to ensure that the first lever 24 oscillates in response to the operation of the transmission cable 43, the first lever 24 is provided with a stopper and a spring for applying an urging force, although not shown. Has been.

  As described above, according to the present embodiment, since the reset operation of the torque releaser 11 can be remotely operated from the driver's seat 7, the reset operation of the torque releaser 11 can be performed without leaving the field. Therefore, it is possible to provide a snow plow 1 that is safe and reliable and has excellent workability. Further, since the time required for the reset operation of the torque releaser 11 is shortened, the efficiency of snow removal work is improved.

  In the above embodiment, the swing operation of the first lever 24 is performed from the driver's seat 7 by the transmission cable 43, but the swing operation of the first lever 24 can also be performed by a hydraulic device instead of the transmission cable 43. That is, if a hydraulic device composed of a hydraulic source, a solenoid valve, a hydraulic cylinder, etc. is used and the first lever 24 is swung by reciprocating movement of the rod of the hydraulic cylinder, the torque relay 11 is reset in the same manner as in the above embodiment. The operation can be performed. In this case, the operation from the driver's seat 7 is performed by switching the electromagnetic valve instead of the transmission cable 43. In this case, a large operating force can be obtained by hydraulic drive, and the reset operation can be easily performed even with the torque releaser 11 having a large torque capacity. Therefore, the present invention can also be applied to a large snowplow.

  In addition, this invention is not limited to an above-described Example, A various deformation | transformation implementation can be performed within the range of the matter described in the claim of this invention. For example, in the above-described embodiment, the snow removal vehicle 1 in which the snow removal device 6 and the vehicle body 2 are separated has been described. However, the present invention can be applied to the snow removal vehicle 1 in which the snow removal device 6 and the vehicle body 2 are integrally formed. Needless to say. Further, the example in which the chain transmission 17 is used to drive the auger shaft 3a has been described, but a gear transmission can be used instead of the chain transmission 17.

It is an external appearance side view of a rotary snowplow. It is an external appearance top view of a rotary snowplow. 1 is a view showing a drive system of a rotary snowplow to which a torque releaser reset device according to the present invention is applied. It is an external view which shows the Example of the reset device of the torque releaser by this invention. It is structural sectional drawing which shows the Example of the reset device of the torque releaser by this invention. FIG. 6 is a structural sectional view showing details of the torque releaser in FIG. 5. It is an AA arrow line view in FIG. It is a BB arrow line view in FIG. It is drawing which shows the drive system of the rotary snowplow using the torque limiting device by the shear pin which is a prior art.

Explanation of symbols

3 Ogre
3a Auger shaft 4 Blower 6 Snow removal device
10 Reset device
11 Torque relay
16 Connecting shaft coupling
17 Chain transmission
19a Driven flange
21 drums
21a annular groove
22a Oscillating shaft
23 Bearing
24 First lever
25 Connecting shaft
26 Second lever
27 Pressing body
43 Transmission cable

Claims (3)

Used in snowplows to remove snow by blowing away the accumulated snow by rotating the auger together with the air flow generated by the blower. A torque releaser is attached to the drive system of the auger, and the torque releaser is reset after a torque limiting operation. In the torque releaser resetting device that can be operated from the driver's seat , a torque releaser is installed between the input shaft of the chain transmission for transmitting power to the auger shaft and the coupling shaft coupling, and the coupling shaft coupling A drum is pivotally supported on a support provided on the housing of the snow removal device outside the outer periphery, a yoke is disposed in an annular groove provided on the outer peripheral surface of the drum, and the swing shaft of the yoke is attached to the housing of the snow removal device. The first lever is fixed to the swinging shaft of the yoke, and the other end of the first lever is operated from the driver's seat. One end of a connecting rod is rotatably mounted on the side of the yoke, and the other end of the connecting rod is pivotally supported by one end of a second lever pivotally supported by the housing of the snow removal device, A reset device for a torque releaser, wherein a pressing body fixed to the other end of the second lever is pressed against a driven flange of the torque releaser. The reset device of the torque releaser of claim 1 Symbol placement and performing operation of the first lever through the transmission cable. The reset device of the torque releaser of claim 1 Symbol placement and performing operation of the first lever by a hydraulic cylinder.

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