JP7283664B2 - snowblower - Google Patents

Description

The present invention relates to a snow blower provided with a snow removal auger.

As the snow remover described above, for example, as shown in Patent Document 1, a rake rotor as a snow removal auger is provided, and when the rake rotor is overloaded, the shear pin is cut and rotation reaches the rake rotor. Some power is stopped.

Japanese Utility Model Laid-Open No. 60-181416

To prevent the shear pin from being cut too frequently due to an increase in the drive load of the snow removal auger, and to prevent the transmission means such as gears, which require much labor and cost for repair or replacement, from being damaged by the increase in the drive load of the snow removal auger. If a driving load is set when the shear pin is cut, the shear pin is not cut until a large load is applied to the snow removal auger, and the snow removal auger tends to deform.

The present invention provides a snow remover capable of avoiding deformation of the snow removing auger and damage to transmission means such as gears due to an increase in driving load of the snow removing auger by means of a compact torque limiter mechanism.

The snow blower according to the invention comprises:
a rotatable auger spindle of a snow removal auger; an auger drive shaft rotatably provided on the same axis as the auger spindle for transmitting power to the auger spindle; and a drive load of the snow removal auger. a torque limiter mechanism that stops transmission of power from the auger drive shaft to the auger support shaft by increasing the torque limiter mechanism, the torque limiter mechanism being a driving rotating part that is formed so as not to rotate relative to the auger drive shaft; A state in which a relay rotating portion formed to be rotatable and slidable relative to the auger drive shaft, a passive rotating portion formed to be non-rotatable relative to the auger support shaft, and a state in which the relay rotating portion is pressed against the drive rotating portion. until the drive load of the snow removal auger increases to the first set value, the power of the drive rotation unit is transferred to the relay rotation unit by friction between the drive rotation unit and the relay rotation unit. and a shear pin that interlocks and connects the relay rotating part to the passive rotating part until the drive load of the snow removing auger increases to a second set value that is larger than the first set value , A gap is provided between the passive rotating part and the relay rotating part in a direction along the rotation axis of the relay rotating part and positioned between the passive rotating part and the relay rotating part. It is provided across the front passive rotating portion and the relay rotating portion through a gap .

According to this configuration, when the drive load of the snow removal auger increases to a load (load of the first set value) smaller than the load (load of the second set value) when the shear pin is cut, the relay rotating portion is driven to rotate. Since the snow removal auger is stopped by slipping with respect to the auger drive shaft, power transmission from the auger drive shaft to the auger support shaft is stopped, the snow removal auger is not subjected to a large load, and deformation of the snow removal auger can be avoided. Even if the drive load of the snow removal auger increases to the load of the first set value, when the relay rotating part does not slip with respect to the drive rotating part due to clogging with mud, etc., and power is transmitted from the auger drive shaft to the auger support shaft, When the drive load of the snow removal auger increases to the load of the second set value, the shear pin is cut, power transmission from the auger drive shaft to the auger support shaft stops, and the snow removal auger stops, so power is transmitted to the auger drive shaft. A large load is not applied to the transmission means such as gears, and breakage of the transmission means can be avoided.

Since the power of the driving rotating part is transmitted to the relay rotating part, and is transmitted from the relay rotating part to the passive rotating part via the shear pin, the disk spring generates friction between the driving rotating part and the relay rotating part. A torque limiter mechanism can be obtained in a compact state.

In the present invention,
The driving rotating portion is provided with a boss portion for fitting the driving rotating portion to the auger drive shaft, and the relay rotating portion and the disc spring are fitted to the boss portion and supported by the boss portion. , and a stopper for holding the relay rotating portion and the disc spring to the boss portion.

According to this configuration, the driving rotating part, the relay rotating part, the disc spring and the stopper can be unitized, so that the driving rotating part, the relay rotating part, the disc spring and the stopper can be easily assembled to the auger drive shaft.

In the present invention,
It is preferable that the stopper is a screw member attached to the boss portion so as to be screwable in a direction along the axis of the boss portion.

According to this configuration, the elastic restoring force of the coned disc spring can be adjusted by adjusting the spiral movement of the stopper, so that the frictional force that interlocks the driving rotating portion and the intermediate rotating portion can be easily adjusted.

In the present invention,
It is preferable that a grease reservoir capable of storing grease is formed in the relay rotating portion in a state of being open toward a portion of the drive rotating portion with which the relay rotating portion contacts.

According to this configuration, the grease is supplied from the grease reservoir between the intermediate rotating portion and the driving rotating portion to prevent the intermediate rotating portion and the driving rotating portion from being rusted. Overload prevention due to slip is performed with high accuracy.

Fig. 2 is a left side view showing the entire walk-behind snow remover; It is a front view of a snow removal part. It is a front view which shows the drive part of a snow-removal auger. FIG. 4 is a cross-sectional view of a torque limiter mechanism; FIG. 5 is a cross-sectional view taken along line VV of FIG. 4;

An embodiment, which is an example of the present invention, will be described below with reference to the drawings.
In the following description, regarding the traveling body of a walk-behind snowplow (an example of a snowplow), the direction of arrow F shown in FIG. The direction of arrow D is defined as "above the body", the direction of arrow D is defined as "below the body", the direction to the front side of the paper is "left side of the body", and the direction to the back side of the paper is defined as "right side of the body".

[Overall Configuration of Walk-behind Snow Plow]
As shown in FIG. 1, the walk-behind snow remover has a traveling body 2 equipped with a pair of left and right crawler-type traveling devices 1 . A snow removing section 10 for removing snow is provided in front of the traveling body 2 . A steering handle 3 is provided at the rear portion of the traveling body 2 . The control handle 3 is composed of a pair of left and right control sticks 3a extending rearward and upward from the body frame 4. As shown in FIG.
A driving unit 6 having an engine 5 is formed in the traveling body 2 between the snow removal unit 10 and the steering handle 3 .

[Composition of the snow removing part]
As shown in Figs. Each of the right parts has a snow removal auger 13 for shoveling snow from the work site, and a shooter 15 for discharging the snow gathered by the snow removal auger 13 and ejected by the blower 14. .

As shown in FIGS. 1 and 2, the auger housing 11 includes a rear wall portion 11a provided in an arc shape behind the left and right snow removing augers 13, and extending forward from both lateral ends of the rear wall portion 11a. and a side wall portion 11b.

As shown in FIG. 2, the left and right snow removing augers 13 include a cylindrical auger support shaft 13a extending in the width direction of the traveling body 2, and two snow plowing augers 13b supported by the auger support shaft 13a so as not to rotate relative to each other. , and a dish-shaped circular auger side 13c supported by the laterally outer end of the auger support shaft 13a relative to the traveling machine body so as not to be relatively rotatable. As shown in FIGS. 2 and 3, the auger support shafts 13a of the left and right snow removal augers 13 are connected to the auger housing 11 from the auger drive shaft 16 rotatably provided in the gear box 12 and the arm portion 11c of the side wall portion 11b. It is supported by a support shaft 17 extending toward the inside of the . The auger support shaft 13a and the auger drive shaft 16 are positioned on the same axis.

[Structure for driving the snow removal auger]
As shown in FIG. 3, an input shaft 18 extends rearward from the top of the gearbox 12 . The input shaft 18 is interlocked with an output shaft (not shown) of the engine 5 via a snow removal clutch (not shown) or the like. A gear mechanism 19 that interlocks the input shaft 18 and the auger drive shaft 16 is provided inside the gear box 12 . The gear mechanism 19 has a worm 19a that is non-rotatably mounted on the input shaft 18, and a worm gear 19b that is non-rotatably mounted on the auger drive shaft 16 while meshing with the worm 19a. The auger support shafts 13a of the right and left snow removal augers 13 are supported by the auger drive shaft 16 and the support shaft 17 so as to be relatively rotatable. Outside the gear box 12, a left torque limiter mechanism 20 is provided across the auger shaft 13a of the left snow removal auger 13 and the auger drive shaft 16, and the auger shaft 13a of the right snow removal auger 13 and the auger drive shaft 16 are connected. A right torque limiter mechanism 20 is provided across.

Power of the engine 5 is input to the gear box 12 through the input shaft 18 , and the input power is transmitted to the auger drive shaft 16 through the gear mechanism 19 . The power of the auger drive shaft 16 is transmitted to the left auger support shaft 13a via the left torque limiter mechanism 20 to drive the left snow removal auger 13. As shown in FIG. The power of the auger drive shaft 16 is transmitted to the right auger support shaft 13a via the right torque limiter mechanism 20 to drive the right snow removal auger 13. As shown in FIG. As the driving load of the left snow removal auger 13 increases, the power transmission from the auger drive shaft 16 to the left auger support shaft 13a is stopped by the left torque limiter mechanism 20, and the left snow removal auger 13 is stopped. As the drive load of the right snow removal auger 13 increases, the power transmission from the auger drive shaft 16 to the right auger support shaft 13a is stopped by the right torque limiter mechanism 20, and the right snow removal auger 13 is stopped.

[Configuration of torque limiter]
As shown in FIGS. 4 and 5, the left and right torque limiter mechanisms 20 include a drive rotary portion 21 formed on the auger drive shaft 16 so as not to rotate relatively, and a relay rotary portion formed on the auger drive shaft 16 so as to rotate relative to each other. 22. A passive rotating part 23 formed on the snow removing auger 13, a disc spring 24 for generating friction between the driving rotating part 21 and the relay rotating part 22, and a shear pin 25 interlockingly connecting the relay rotating part 22 to the passive rotating part 23. have.

Specifically, the drive rotation portion 21 is fitted onto the auger drive shaft 16 by means of a boss portion 21 a provided on one lateral side of the drive rotation portion 21 . The boss portion 21a and the auger drive shaft 16 are engaged with each other by a key 26 so as to be non-rotatable relative to each other. A set bolt 27 positions the boss 21 a relative to the auger drive shaft 16 .

The relay rotating portion 22 is formed in a relatively rotatable and slidable state with respect to the auger drive shaft 16 by being rotatably and slidably fitted on the boss portion 21a. It is rotatable and slidable relative to the auger drive shaft 16 .

The disk spring 24 is fitted on the boss portion 21a while being arranged on the opposite side of the drive rotation portion 21 with respect to the relay rotation portion 22. As shown in FIG. A plate 28 positioned between the relay rotating portion 22 and the disc spring 24 is fitted onto the boss portion 21a. A screw member 29 is attached to a screw shaft portion 21b formed in a boss portion 21a on the side opposite to the relay rotation portion 22 with respect to the disc spring 24. As shown in FIG. The screw member 29 can be screwed in the direction along the axis P of the boss portion 21a with respect to the boss portion 21a by engaging with the screw shaft portion 21b. The screw member 29 positions the disc spring 24 with respect to the boss portion 21a, and constitutes a stopper that holds the disc spring 24, the plate 28, and the relay rotating portion 22 to the boss portion 21a so as not to come off the boss portion 21a. ing. The disc spring 24 is pressed against the plate 28 by the screw member 29 and has an elastic restoring force. Friction is generated between the rotating portion 22 and the drive rotating portion 21 . The disk spring 24 is positioned by a screw member 29 at a mounting position with respect to the boss portion 21a for generating friction between the relay rotating portion 22 and the driving rotating portion 21. As shown in FIG. The screw member 29 is prevented from rotating by a stopper 30 so that it does not loosen from the position where the disc spring 24 should be positioned.

The passive rotating portion 23 is composed of an auger supporting member that supports the snow plowing auger 13b on the auger support shaft 13a. As shown in FIGS. 3 and 4, the auger support member extends from the auger support shaft 13a so as not to rotate relatively, and the extending ends are connected to the gearbox-side ends of the two snow plowing augers 13b. there is As a result, the passive rotating portion 23 cannot rotate relative to the auger support shaft 13a.

The shear pin 25 is mounted on the relay rotating portion 22 and the passive rotating portion 23 at one point in the circumferential direction of the relay rotating portion 22 and on the outer side of the driving rotating portion 21 in the diametrical direction with respect to the driving rotating portion 21 . , and the relay rotating portion 22 and the passive rotating portion 23 are interlocked.

In each of the left and right torque limiter mechanisms 20, when the driving load of the snow removing auger 13 increases, a slip occurs between the relay rotating portion 22 and the driving rotating portion 21 against the elastic restoring force of the disc spring 24. A first set value is set as the value of the driving load of the snow removal auger 13 . As the value of the driving load of the snow removing auger 13 when the shear pin 25 is cut by the relative rotation between the passive rotating portion 23 and the relay rotating portion 22 due to the increase in the driving load of the snow removing auger 13, a second set value larger than the first set value is set. Setting value is set.

As shown in FIGS. 4 and 5, grease reservoirs 31 are formed at three locations in the circumferential direction of the relay rotating portion 22 . The three grease reservoirs 31 are formed in a state of opening toward a portion of the drive rotation portion 21 with which the relay rotation portion 22 contacts. Grease is supplied from the grease reservoir 31 between the relay rotating portion 22 and the drive rotating portion 21, so that the drive rotating portion 21 and the relay rotating portion 22 are prevented from rusting.

In the left and right torque limiter mechanisms 20, until the drive load of the snow removing auger 13 increases to the first set value, the friction between the driving rotating portion 21 and the relay rotating portion 22 generated by the elastic restoring force of the disc spring 24 drives the torque limiter mechanism 20. The power of the rotating part 21 is transmitted to the relay rotating part 22, and the power of the relay rotating part 22 is transmitted to the passive rotating part 23 by the shear pin 25, thereby enabling the snow removing auger 13 to be driven. When the drive load of the snow removing auger 13 increases to or above the first set value, a slip occurs between the driving rotating portion 21 and the intermediate rotating portion 22 against the elastic restoring force of the disc spring 24, causing the driving rotating portion 21 to slip. Power transmission to the relay rotating part 22 is stopped and the snow removal auger 13 is stopped. At this time, due to the relative rotation between the drive rotary part 21 and the relay rotary part 22, the entire circumferences of the drive rotary part 21 and the relay rotary part 22 are separated from the grease reservoir 31 between the drive rotary part 21 and the relay rotary part 22. Grease is supplied in a state that spans

In the left and right torque limiter mechanisms 20, even if the drive load of the snow removal auger 13 increases to the first set value, if no slippage occurs between the drive rotation unit 21 and the relay rotation unit 22 due to clogging with dust, etc., the snow removal is not performed. Until the drive load of the auger 13 increases to the second set value, the shear pin 25 is not disconnected, and the power of the relay rotating portion 22 is transmitted to the passive rotating portion 23 by the shear pin 25 . When the drive load of the snow removing auger 13 increases to or above the second set value, the shear pin 25 is cut by the relative rotation between the relay rotating portion 22 and the passive rotating portion 23, and power transmission from the relay rotating portion 22 to the passive rotating portion 23 is interrupted. It is stopped to stop the snow removal auger 13 .

[Another embodiment]
(1) In the above-described embodiment, the example in which the snow removal augers 13 are provided on both lateral sides of the gear box 12 is shown, but the present invention is not limited to this. For example, a series of auger shafts across the lateral ends within the auger housing, a left snowplow auger supported on the left portion of the series of auger shafts, and a right snow plow auger supported on the right portion of the series of auger shafts. A snow plowing auger may be provided, and the spiral direction of the left snow plowing auger may be opposite to the spiral direction of the right snow plowing auger.

(2) In the above-described embodiment, an example in which the screw member 29 constitutes the stopper was shown, but the present invention is not limited to this. For example, it is possible to employ a stopper pin inserted into the boss portion 21a.

(3) In the above-described embodiment, an example in which the relay rotating part 22, the disc spring 24 and the stopper (screw member 29) are supported by the boss part 21a is shown. It may be supported.

(4) In the above-described embodiment, an example in which the grease reservoir 31 is provided has been shown, but it may not be provided. Moreover, in the case where the grease reservoirs 31 are provided, they may be provided at two or less locations, or at four or more locations.

INDUSTRIAL APPLICABILITY The present invention can be applied to a snow blower provided with a snow removal auger.

13 snow removing auger 13a auger support shaft 16 auger drive shaft 20 torque limiter mechanism 21 drive rotating part 21a boss part 22 relay rotating part 23 passive rotating part 24 disc spring 25 shear pin 29 stopper (screw member)
31 Grease reservoir P Shaft center

Claims (4)

a rotatable auger spindle of the snow removal auger;
an auger drive shaft that is rotatably provided on the same axis as the auger support shaft and that transmits power to the auger support shaft;
a torque limiter mechanism that stops power transmission from the auger drive shaft to the auger support shaft due to an increase in the drive load of the snow removal auger;
The torque limiter mechanism includes a driving rotating portion formed on the auger drive shaft so as not to rotate relative to it, a relay rotating portion formed on the auger drive shaft so as to rotate and slide relative to it, and a rotating portion that rotates relative to the auger support shaft. The passive rotator and the relay rotator are supported on the auger drive shaft in a state of being pressed against the drive rotator, and the driving load of the snow removal auger increases to a first set value. A disc spring for transmitting the power of the driving rotating part to the relay rotating part by friction between the rotating part and the relay rotating part, and the drive load of the snow removal auger is increased to a second set value larger than the first set value. a shear pin that interlocks and connects the relay rotating part to the passive rotating part until the
a gap is provided between the passive rotating part and the relay rotating part in a direction along the rotation axis of the relay rotating part and positioned between the passive rotating part and the relay rotating part;
The snow remover, wherein the shear pin is provided across the front passive rotating portion and the intermediate rotating portion through the gap . The drive rotation part is provided with a boss part for fitting the drive rotation part to the auger drive shaft,
The intermediate rotating portion and the disc spring are fitted onto the boss portion,
2. The snow remover according to claim 1, further comprising a stopper supported by said boss portion and holding said relay rotating portion and said disc spring to said boss portion. 3. The snow blower according to claim 2, wherein the stopper is a screw member mounted on the boss portion so as to be screwable in a direction along the axis of the boss portion. 4. The grease reservoir according to any one of claims 1 to 3, which is formed in said relay rotating portion in a state of opening toward a portion of said driving rotating portion with which said relay rotating portion contacts, and is capable of storing grease. 1. The snow blower according to item 1.

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