JP4327326B2 - Power transmission device for snowplow - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a snow remover that prevents an overload from acting on the auger itself and the power transmission path and that can be easily replaced by a single blower when the blower is damaged by simplifying the blower mounting structure. The present invention relates to a power transmission device.
[0002]
[Prior art]
As a power transmission device for a snowplow, for example, a device described in “Snowplow” in Japanese Utility Model Publication No. 51-34111 is known.
In FIG. 1 of the above publication, a pulley 22 is attached to the output shaft of the engine 10, and a belt is hung between the pulley 22 and a pulley 9 attached to the rear end of the rotation transmission shaft 5. 7, a snow remover is described in which the tip of rotation transmission shaft 5 is connected to auger unit 3, and auger 4 is attached to auger shaft 2 of the auger unit 3.
[0003]
[Problems to be solved by the invention]
For example, during rotation of the auger 4, if the auger 4 bites into the snow on the road surface, freezes snow, or stones protruding from the road surface, the rotation of the auger 4 itself or the auger rotating shaft 2 causes the output of the engine 10. An excessive force may act on the power transmission path to the shaft, and further on the engine 10.
[0004]
Further, for example, when large stones or ice blocks are mixed in the snow scratched by the auger 4, if the blower 7 is prevented from rotating by being bitten between the blower 7 and the fuselage, the blower 7 itself It is conceivable that an excessive force acts on the blades of the blower 7 and the blades of the blower 7 are damaged.
[0005]
When the blower 7 and the pulley 9 are integrally attached to the rotation transmission shaft 5, the rotation transmission shaft 5 and the pulley 9 must be replaced together with the blower 7 when the blower 7 is damaged. The cost is high.
[0006]
Accordingly, an object of the present invention is to prevent an overload from acting on the auger itself and the power transmission path in the power transmission device of the snowplow, and to simplify the blower mounting structure, thereby damaging the blower. The purpose is to make it easy to replace the blower alone when it is received.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention relates to a snow remover in which a drive shaft is rotated by a drive source, a blower is rotated by the drive shaft, and an auger disposed in front of the blower is rotated via an auger mission. When the value exceeds the specified value, a rubber shaft coupling is provided between the drive shaft and the auger mission so that the outer cup on the output side turns behind the inner shaft on the input side , and the inner shaft is attached to the drive shaft. The outer cup is detachably attached to the input shaft provided by the first fastening member, the blower is detachably attached to the drive shaft by the second fastening member, and the rubber shaft joint is inserted inside the outer cup and the outer cup. Inner shafts and cushion rubber inserted between each of these inner shafts and outer cups The inner shaft is composed of an inner shaft hollow shaft and a flange member attached to the inner shaft hollow shaft, and the flange member projects radially outward. The outer cup includes an outer protruding portion and a pin insertion hole for inserting a connecting pin, and the outer cup protrudes radially inward of the outer cup hollow shaft, a cup member attached to the tip of the outer cup hollow shaft, and the cup member. The cushion rubber is inserted between the outer protruding portion and the inner protruding portion in a compressed state .
[0008]
By preventing the overload from acting on the auger and the power transmission path with the rubber shaft joint provided between the drive shaft and the auger mission, and by detachably attaching the blower to the drive shaft with the second fastening member, A blower with a simple mounting structure can be easily replaced with a single blower.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a snowplow having a power transmission device according to the present invention. A snowplow 10 has a crawler 12 rotatably attached to a machine body frame 11 and extends a handle 13 rearward and upward from the machine body frame 11. A grip 14 is provided at an end of the handle 13, an engine 15 as a drive source is mounted on the machine frame 11, and a drive shaft 16 rotated by the engine 15 is extended forward (to the left in the figure) of the machine frame 11, and the drive shaft 16 The engine 18 is connected to the auger 18 through the friction shaft coupling 17 as an overload prevention mechanism, the blower 21 is attached to the drive shaft 16, and the auger 23 is attached to the auger shaft 22 of the auger 18. 16, the auger 23 is rotated by the drive shaft 16 via the friction shaft joint 17 and the auger mission 18, and the auger 23 is brought to the end. Scraping fried with blower 21 is a device for projecting the far through the chute 24.
[0010]
FIG. 2 is a cross-sectional view (partial side view) of the power transmission device according to the present invention, and a friction shaft that prevents an overload from acting on the power transmission path from the drive shaft 16 to the auger 23 (see FIG. 1). It shows that the joint 17 is disposed in the space 26 between the auger 18 and the blower 21.
[0011]
Also, in the drawing, the input side member of the friction shaft joint 17 is the drive shaft 16, and the output side member is the outer cup 28, and this outer cup 28 is connected to the later described input input shaft with bolts 29 and nuts 31. The blower shaft 32 serving as the shaft of the blower 21 is detachably attached with bolts 33 and nuts 34 as fastening members.
[0012]
The mission 18 includes a mission case 35, an mission input shaft 36 as an input shaft rotatably attached to the mission case 35, a worm wheel 38 that meshes with a worm 37 formed on the mission input shaft 36, The auger shaft 22 is attached to the central portion of the worm wheel 38.
The worm 37 and the worm wheel 38 constitute a worm gear 39.
[0013]
FIG. 3 is a perspective view (partially sectional view) of the friction shaft coupling according to the present invention. In the friction shaft coupling 17, a collar 42 is splined to the drive shaft 16, and an inner plate 43 as a friction plate is connected to the collar 42. ... (... indicates multiple, the same shall apply hereinafter) by spline-joining the inner peripheral surfaces, and one outer plate 44 ... as a friction plate for these inner plates 43 ... In addition, the outer peripheral surface of the outer plate 44 is splined to the inner peripheral surface of the outer cup 28, and the inner plate 43... And the outer plate 44. By pressing with the elastic force of the spring 46, a frictional force is generated between the inner plate 43... And the outer plate 44. Rotatably supported at 47 and 48, a mechanism for preventing entry of foreign matter from the outside with sealing oil in the space between the bearings 47 and 48 in the oil seal 51 and 52.
[0014]
That is, the friction shaft joint 17 is a wet friction shaft joint in which the inner plate 43 and the outer plate 44 are multi-plates.
Here, in order to easily understand the state of the spline connection, a part of the collar 42 is cut and one inner plate 43 and one outer plate 44 are not cut. Reference numeral 53 denotes a disk adjacent to the oil seal 52, 54 and 54 denote rings for preventing the bearing 48 and the disk 53 from coming off, and 55 denotes a hollow shaft constituting the outer cup 28.
[0015]
FIG. 4 is a system diagram of a power transmission device according to the present invention, and shows a power transmission device that constitutes a power transmission path for transmitting engine power to a blower and an auger.
The power of the engine 15 is divided into the friction shaft joint 17 and the blower 21.
In the friction shaft joint 17, power is transmitted from the drive shaft 16 to the blower 21 through the drive shaft 16 → the collar 42 → the inner plate 43 → the outer plate 44 → the outer cup 28.
[0016]
The outer cup 28 is also transmitted to the auger 18, and is transmitted from the auger shaft 22 to the auger 23 through the auger input shaft 36 → the worm gear 39 → the auger shaft 22.
[0017]
In other words, the power of the engine 15 is transmitted to the auger mission 18 and the auger 23 through the friction shaft joint 17 and from the drive shaft 16 constituting the friction shaft joint 17 to the blower 21.
Therefore, the power transmission path member from the engine 15 to the auger 23 by the friction shaft coupling 17, that is, the friction shaft coupling 17, the auger mission 18, the auger 23 and the engine 15, particularly the downstream side of the power transmission to the friction shaft coupling 17. It is possible to prevent an overload from acting on the auger 23 itself.
[0018]
Next, the operation of the power transmission device described above will be described.
5A and 5B are operation diagrams for explaining the operation of the power transmission device according to the present invention. FIG. 5A shows the state of the snowplow, and FIG. 5B shows the state of the power transmission path.
In (a), for example, when the auger 23 of the snow remover 10 during snow removal (57 is snow) hits the protruding portion 59 of the road surface 58, the rotation of the auger 23 in the rotational direction as indicated by the arrow (1) is prevented, The load acting on the auger 23 itself and the power transmission path from the engine 15 to the auger 23 increases.
[0019]
As a result, in (b), a resistance force as indicated by the arrow (2) acts in the rotation direction opposite to the arrow (1) with respect to the rotation direction as indicated by the arrow (1) of the auger shaft 22. As a result, a torsional moment T is generated between the mission input shaft 36 and the drive shaft 16.
[0020]
FIG. 6 is a graph for explaining the operation of the power transmission device according to the present invention, and shows the relationship between the torsional moment of the input input shaft and time. The vertical axis of the graph represents torsional moment T, and the horizontal axis represents time t. (Refer to FIG. 2 and FIG. 3 for the symbols)
The torsional moment T generated in the orchestration input shaft 36 during normal snow removal is defined as T1.
[0021]
T2 is the friction coefficient of the surfaces of the inner and outer plates 43 and 44 of the friction shaft joint 17, the pressing force with which the disc spring 46 presses the inner and outer plates 43 and 44, and the inner and outer plates 43 and 44. This is a predetermined torsional moment determined by the diameter of the friction part.
[0022]
For example, when the auger 23 hits the protruding portion 59 of the road surface 58 as shown in FIG. 5A when the time t reaches t1, the torsional moment T increases rapidly from T1 in FIG. However, when the time t becomes t2 and the torsional moment T reaches a predetermined torsional moment T2, the inner plate and the outer plate of the friction shaft coupling 17 shown in FIG. 5B slip, and in FIG. The moment T does not exceed T2. Therefore, if the torsional moment T2 is set smaller than the strength of each component of the power transmission path, it is possible to prevent an overload from acting on each component of the power transmission path.
[0023]
In FIG. 5A, for example, when the auger 23 scratches large stones or ice blocks and bites these stones or ice blocks between the blower 21 and the body of the snow removal machine 10, for example, It is conceivable that the rotation of the blower 21 is prevented and the blades of the blower 21 are damaged. If the blower 21 is damaged, the bolt 33 and the nut 34 are loosened and the blower 21 can be easily replaced with a new blower 21. Can do.
[0024]
As described above with reference to FIGS. 1 and 2, the present invention rotates the drive shaft 16 with the engine 15, rotates the blower 21 with the drive shaft 16, and installs the auger 23 disposed in front of the blower 21 with the orgasm. In the snowplow 10 that rotates via 18, when the transmission torque reaches a predetermined value or more, the friction shaft coupling 17 in which the outer cup 28 as the output side member rotates with respect to the drive shaft 16 as the input side member is connected to the drive shaft 16. The blower 21 is detachably attached to the drive shaft 16 with bolts 33 and nuts 34.
[0025]
By providing the friction shaft joint 17 between the drive shaft 16 and the auger mission 18, it is possible to prevent an overload from acting on the auger 23 and the power transmission path, and a blower 21 is provided on the drive shaft 16. Since the bolts 33 and nuts 34 are detachably attached, for example, when the blower 21 is damaged, the blower 21 having a simple attachment structure can be easily replaced with the blower 21 alone. Therefore, workability can be improved and the replacement of the blower 21 alone can reduce the cost of parts for replacement.
[0026]
FIG. 7 is a cross-sectional view (partial side view) of another embodiment of the power transmission device according to the present invention, in which an overload acts on the power transmission path from the drive shaft 16 to the auger 23 (see FIG. 1). This shows that the rubber shaft coupling 62 as an overload prevention mechanism for preventing the above is disposed in the space 26 between the auger 18 and the blower 21.
[0027]
Further, in the drawing, an inner shaft 63 as an input side member of the rubber shaft coupling 62 is attached to the drive shaft 16, and an outer cup 64 as an output side member of the rubber shaft coupling 62 is connected to the organization input shaft 36 by bolts 29 and nuts 31. The blower 21 is detachably attached to the drive shaft 16 via the blower shaft 32 with bolts 33 and nuts 34.
[0028]
FIG. 8 is an exploded perspective view of a rubber shaft coupling that constitutes another embodiment of the power transmission device according to the present invention. The rubber shaft coupling 62 includes the inner shaft 63 and the outer cup 64 described above, and the inner shaft 63. And cushion rubbers 65, 65 inserted between the outer cups 64 and a connecting pin 66 for integrally connecting the inner shaft 63 to the drive shaft 16 (see FIG. 7).
[0029]
The inner shaft 63 includes a hollow shaft 67 and a flange member 68 attached to the hollow shaft 67. The flange member 68 inserts outward projecting portions 71 and 71 projecting radially outward and a connecting pin 66. Pin insertion holes 72, 72 (reference numeral 72 on the back side is not shown).
[0030]
The outer cup 64 includes a hollow shaft 74, a cup member 75 attached to the tip of the hollow shaft 74, and inward projecting portions 76 and 76 that project inward in the diameter of the cup member 75.
The cushion rubber 65 has a shape obtained by cutting a cylinder along an axis.
[0031]
FIG. 9 is a cross-sectional view of a rubber shaft coupling that constitutes another embodiment of the power transmission device according to the present invention, and between the outer protrusion 71 of the inner shaft 63 and the inner protrusion 76 of the outer cup 64. The cushion rubber 65 is inserted in a compressed state.
Therefore, the cushion rubber 65 is in a state in which the outward protrusion 71 and the inward protrusion 76 are pressed with a predetermined pressing force (set load).
[0032]
FIG. 10 is a system diagram of another embodiment of the power transmission device according to the present invention, and shows a power transmission device that constitutes a power transmission path for transmitting the power of the engine 15 to the blower 21 and the auger 23. (Refer to FIG. 7 and FIG. 8 for the reference.)
The power of the engine 15 is divided into the rubber shaft joint 62 and the blower 21 by the drive shaft 16, and is transmitted from the inner shaft 63 → the cushion rubber 65 → the outer cup 64 on the rubber shaft joint 62 side.
[0033]
Further, the power is transmitted from the outer cup 64 to the auger 18, and the auger 18 is transmitted from the auger shaft 22 to the auger 23 through the auger input shaft 36 → the worm gear 39 → the auger shaft 22.
[0034]
That is, the power of the engine 15 is transmitted from the drive shaft 16 to the auger mission 18 and the auger 23 via the rubber shaft joint 62.
Therefore, an overload acts on the members of the power transmission path from the drive shaft 16 to the auger 23 by the rubber shaft joint 62, that is, the drive shaft 16, the rubber shaft joint 62, the auger mission 18, the auger 23 itself, and the engine 15. Can be prevented.
[0035]
Next, the operation of another embodiment of the power transmission device described above will be described.
11 (a) and 11 (b) are first operation diagrams for explaining the operation of another embodiment of the power transmission device according to the present invention, where (a) is the state of the snowplow and (b) is the power transmission. Indicates the status of the route.
In (a), for example, when the auger 23 of the snow remover 10 during snow removal hits the protruding portion 59 of the road surface 58, the rotation of the auger 23 in the rotational direction as indicated by the arrow (1) is prevented, and the auger 23 itself, The load acting on the power transmission path from the drive shaft 16 to the auger 23 and the engine 15 increases.
[0036]
As a result, in (b), a resistance force as indicated by the arrow (2) acts in the rotation direction opposite to the arrow (1) with respect to the rotation direction as indicated by the arrow (1) of the auger shaft 22. As a result, a torsional moment T is generated between the auger input shaft 36 and the drive shaft 16 from the auger shaft 22 via the worm wheel 38.
[0037]
FIG. 12 is a second operation diagram for explaining the operation of another embodiment of the power transmission device according to the present invention.
When the torsional moment T described in FIG. 11B exceeds the torsional moment obtained from the pressing force (set load) acting on the outward projecting portion 71 and the inward projecting portion 76 described in FIG. The rubber shaft joint 62 is twisted, and the cushion rubbers 65, 65 of the rubber shaft joint 62 are sandwiched between the outer protruding portion 71 of the inner shaft 63 and the inner protruding portion 76 of the outer cup 64, respectively, and contract.
[0038]
As a result, the auger 22 (see FIG. 11A) itself absorbs the impact, that is, the overload generated in the engine 15 between the auger 18 and the auger input shaft 36 and the drive shaft 16 shown in FIG. can do.
[0039]
FIG. 13 is a graph for explaining the operation of another embodiment of the power transmission device according to the present invention, and shows the relationship between the torsional moment between the input input shaft and the drive shaft and time. The vertical axis of the graph represents torsional moment T, and the horizontal axis represents time t. (See Fig. 8 for symbols)
Let T = T1 be the torsional moment T generated between the mission input shaft 36 and the drive shaft 16 during normal snow removal.
[0040]
In the present embodiment, when the auger 23 hits the projecting portion 59 of the road surface 58 as shown in FIG. 11A when the time t reaches t1, in FIG. It gradually increases with a gentle gradient, and the time t becomes t3, and the torsional moment T reaches a predetermined torsional moment T2.
[0041]
On the other hand, in the comparative example (shown by a broken line) which is a power transmission device having no rubber shaft joint, the torsional moment T is caused by the auger hitting the protruding portion of the road surface when the time reaches t1. It increases rapidly from T1, the time t reaches t2, and the torsional moment T reaches a predetermined torsional moment T2.
[0042]
Thus, until the torsional moment T changes from T1 to T2, in the comparative example, the time from t1 to t2 is short, and in the example, the time from t1 to t3 is long.
Therefore, in the comparative example, it is difficult to absorb the impact because it is a short time, but in the present embodiment, the rubber shaft joint 62 can effectively absorb the impact over a long time, and the power transmission path It is possible to prevent an overload from acting on each component.
[0043]
As described above with reference to FIG. 7, in the present invention, when the transmission torque exceeds a predetermined value, the rubber shaft coupling 62 in which the outer cup 64 as the output side member rotates with respect to the inner shaft 63 as the input side member is delayed. Is provided between the drive shaft 16 and the organization 18, and a blower 21 is detachably attached to the drive shaft 16 with a bolt 33 and a nut 34.
[0044]
The rubber shaft joint 62 provided between the drive shaft 16 and the auger mission 18 can prevent an overload from acting on the auger 23 (see FIG. 1) and the power transmission path. By attaching the bolt 21 and the nut 34 detachably, the blower 21 having a simple mounting structure can be easily replaced with the blower 21 alone.
Moreover, in the power transmission device of the present invention, the overload can be reduced with a simple structure such as the rubber shaft coupling 62, and the manufacturing cost can be suppressed.
[0045]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
The power transmission device for a snowplow according to claim 1 is provided with a rubber shaft coupling between the drive shaft and the augment where the output side member is delayed with respect to the input side member when the transmission torque exceeds a predetermined value. The input side member is attached to the drive shaft, the output side member is detachably attached to the mission input shaft provided in the organization by the first fastening member, and the blower is detachably attached to the drive shaft by the second fastening member. Therefore, by providing the rubber shaft coupling between the drive shaft and the auger mission, it is possible to prevent an overload from acting on the auger itself and the power transmission path.
[0046]
In addition, since the blower is detachably attached to the drive shaft by the second fastening member, for example, when the blower is damaged, the blower having a simple attachment structure can be easily replaced by the blower alone.
Therefore, workability can be improved and replacement of the blower alone can reduce the cost of parts for replacement.
[Brief description of the drawings]
FIG. 1 is a side view of a snowplow having a power transmission device according to the present invention. FIG. 2 is a cross-sectional view (partial side view) of a power transmission device according to the present invention.
FIG. 3 is a perspective view (partially sectional view) of a friction shaft coupling according to the present invention.
FIG. 4 is a system diagram of the power transmission device according to the present invention. FIG. 5 is an operation diagram illustrating the operation of the power transmission device according to the present invention. FIG. 6 is a graph illustrating the operation of the power transmission device according to the present invention. FIG. 7 is a cross-sectional view (partial side view) of another embodiment of the power transmission device according to the present invention.
FIG. 8 is an exploded perspective view of a rubber shaft coupling constituting another embodiment of the power transmission device according to the present invention. FIG. 9 is a rubber shaft coupling constituting another embodiment of the power transmission device according to the present invention. FIG. 10 is a system diagram of another embodiment of the power transmission device according to the present invention. FIG. 11 is a first operation diagram for explaining the operation of another embodiment of the power transmission device according to the present invention. FIG. 12 is a second operation diagram for explaining the operation of another embodiment of the power transmission device according to the present invention. FIG. 13 is a graph for explaining the operation of another embodiment of the power transmission device according to the present invention. Explanation of]
DESCRIPTION OF SYMBOLS 10 ... Snow remover, 15 ... Drive source (engine), 16 ... Drive shaft, 18 ... Auger mission, 21 ... Blower, 23 ... Auger , 29 , 31 ... First fastening member (bolt, nut), 33, 34 ... Second fastening member (bolt, nut), 36 ... Organization input shaft , 62 ... Rubber shaft joint, 63 ... Inner shaft, 64 ... Outer cup, 65 ... Cushion rubber, 66 ... Connecting pin, 67 ... Inner shaft hollow shaft (Hollow shaft), 68 ... flange member, 71 ... outward projection, 72 ... pin insertion hole, 74 ... outer cup hollow shaft (hollow shaft), 75 ... cup member, 76 ... inward projection .

Claims (1)

In a snow remover that rotates a drive shaft with a drive source, rotates a blower with this drive shaft, and rotates an auger arranged in front of this blower via an auger mission.
When the transmission torque exceeds a predetermined value, a rubber shaft coupling is provided between the drive shaft and the auger mission so that the outer cup on the output side rotates with respect to the inner shaft on the input side , and the inner shaft is provided on the drive shaft. The outer cup is detachably attached to the input shaft provided in the orgasm with the first fastening member, and the blower is detachably attached to the drive shaft with the second fastening member .
The rubber shaft coupling connects the inner shaft to the outer cup, the inner shaft inserted inside the outer cup, a cushion rubber inserted between each of the inner shaft and the outer cup, and the drive shaft. It consists of a connecting pin for
The inner shaft includes an inner shaft hollow shaft and a flange member attached to the inner shaft hollow shaft. The flange member includes an outer projecting portion projecting radially outward and a pin for inserting the connecting pin. With an insertion hole,
The outer cup is composed of an outer cup hollow shaft, a cup member attached to the tip of the outer cup hollow shaft, and an inward protruding portion that protrudes radially inward of the cup member,
A power transmission device for a snowplow , wherein the cushion rubber is inserted in a compressed state between the outward protrusion and the inward protrusion .

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