WO2023007773A1

WO2023007773A1 - Snow plough

Info

Publication number: WO2023007773A1
Application number: PCT/JP2022/003839
Authority: WO
Inventors: 正敏竹下; 泰寛宮内
Original assignee: ヤマハモーターパワープロダクツ株式会社
Priority date: 2021-07-30
Filing date: 2022-02-01
Publication date: 2023-02-02
Also published as: JP7209781B1; JP2023020426A

Abstract

A snow plough 10 includes an auger housing 22 that houses an auger shaft 34 and that includes a plurality of through-holes 30. Each plate member 60 is detachably provided on an outer surface of the auger housing 22 in such a manner as to cover a corresponding through-holes 30, and each bearing 70 rotatably supports the auger shaft 34 and is supported on an inner surface of the corresponding plate member 60. An auger 24a (24b) is provided between the bearing 70 and a gear box 40 provided in a central portion of the auger shaft 34, and a shear bolt protection member 78 is provided between the auger 24a (24b) and the bearing 70. The shear bolt protection member 78 includes a first flange portion 80 fixed to the auger shaft 34, a second flange portion 82 coupled to the auger 24a (24b) by a shear bolt 90, and an elastic member 84 interposed between the first flange portion 80 and the second flange portion 82.

Description

snowblower

This invention relates to a snow blower, and more specifically to a snow blower in which an auger is connected to an auger shaft via shear bolts.

As an example of this type of conventional technology, Patent Document 1 discloses a snow remover. In this snow blower, left and right augers are arranged in front of the machine body, and a gear case is arranged between the left and right auger shafts that support these augers. of auger shafts are connected. At least one of the left and right shear pins breaks when an excessive load acts on the left and right augers, thereby protecting the gear case and the drive source mounted on the fuselage.

Utility Model Registration No. 3132846

In Patent Document 1, in order to replace the broken shear pin, it is necessary to prepare a new shear pin, remove snow attached to the auger, check the mounting position of the shear pin, and attach the shear pin. If the shear pin breaks frequently, the replacement work becomes troublesome.

Therefore, in order to reduce the breakage of the shear pin (shear bolt), an elastic member (rubber part) is provided near the shear pin in order to reduce the impact force of ice, stones, etc. applied to the shear pin through the auger. machine is proposed. This elastic member (rubber part) is mounted near the center of the snow removal mechanism, that is, near the left and right sides of the gear case. Therefore, when exchanging the elastic member, which is a consumable part, there are a plurality of parts to be removed, which takes a long time.

Therefore, the main object of the present invention is to provide a snow blower that can shorten the time required for exchanging elastic members and reduce the work and maintenance costs.

According to one aspect of the present invention, an auger shaft, an auger housing containing the auger shaft and having a through hole provided at a position corresponding to the end of the auger shaft, and a gear box provided at the center of the auger shaft a plate member detachably provided on the outer surface of the auger housing so as to cover the through hole; a bearing rotatably supporting the auger shaft and supported on the inner surface of the plate member; and a gear box attached to the auger shaft. and a bearing, a shear bolt protection member fitted to the auger shaft and provided between the auger and the bearing, and a shear bolt connecting the shear bolt protection member and the auger, The protective member includes a first flange portion fixed to the auger shaft, a second flange portion fitted to the first flange portion and connected to the auger by a shear bolt, and a portion between the first flange portion and the second flange portion. and a resilient member interposed in the snowplow.

In this invention, when replacing the elastic member, removing the plate member from the outer surface of the auger housing also removes the bearing from the auger shaft. Here, since the shear bolt protection member fitted to the auger shaft is located outside the auger in the vicinity of the auger shaft, the shear bolt protection member can be seen through the through hole for maintenance of the auger housing, and the auger can be removed from the auger shaft. Direct access to the shearbolt protection through the through hole without removal. Therefore, it is possible to shorten the time required for replacing the elastic member included in the shear bolt protection member, and reduce the work and maintenance costs.

Preferably, it further includes a bearing housing that holds the outer periphery of the bearing and is attached to the inner surface of the plate member. In this case, the plate member, the bearing housing, and the bearing can be disassembled and assembled integrally with the snow blower, and maintenance work time can be shortened.

Also preferably, the second flange portion has a recess or a screw. In this case, since the puller can be removed from the recess or the screw of the second flange, the puller can be removed when removing the second flange from the snow blower, thereby shortening the maintenance work time.

Further preferably, a fastening member for fixing the plate member to the outer surface of the auger housing is included, and the fastening member is not provided in a horizontal plane including the auger shaft. In this case, when accessing the auger shaft from the front, that is, when accessing through the opening of the auger housing, the fastening member does not become an obstacle, and the disassembly and assembly operations are further facilitated.

Preferably, the shear bolt protection member is provided axially inward from the outer end of the auger in the axial direction of the auger shaft. In this case, the snow can be removed by raking the snow in the vicinity of the shear bolt protection member with the auger.

Also preferably, the auger shaft has a first keyway formed in the central portion of the auger shaft for fixing the gearbox, and a second keyway formed at the end of the auger shaft for fixing the first flange portion. a keyway; In this case, the distance between the first key groove for the gearbox and the second key groove for the first flange portion can be increased on the auger shaft. Therefore, the torsional strength of the auger shaft against impact load can be improved.

According to this invention, it is possible to shorten the time required for replacing the elastic member, and reduce the work and maintenance costs.

1 is a side view showing a snow remover according to one embodiment of the present invention; FIG. FIG. 2 is a plan view showing the snow blower of FIG. 1; FIG. 2 is a front view showing the snow blower of FIG. 1; It is a partially cross-sectional front view showing an auger, an auger housing, and the vicinity thereof. It is an enlarged cross-sectional view showing the vicinity of one end of the auger shaft. FIG. 4 is an exploded perspective view showing one side of the auger housing and nearby components; FIG. 4 is an exploded perspective view showing components provided on one side of the auger housing; It is an exploded perspective view which shows a shear bolt protection member. FIG. 4A is a front view of the first flange portion, and FIG. 4B is a cross-sectional view along line AA. FIG. 10 is a view showing the second flange portion, (a) is a front view, (b) is a BB cross-sectional view, and (c) is a rear view and a CC cross-sectional view. It is a table|surface which shows one experiment result. It is a figure which shows the modification of a 2nd flange part, (a) is a front view, (b) is DD sectional drawing.

Embodiments of the present invention will be described below with reference to the drawings.

Front and back, left and right, and up and down in the embodiment of the present invention mean front and back, left and right, and up and down with reference to the state in which the operator pushes the snow blower 10 forward. In the drawings, "Fr" indicates the front, "Rr" indicates the rear, "R" indicates the right, "L" indicates the left, "U" indicates the upper, and "Lo" indicates the Shows downwards.

1 to 3, a snow remover 10 according to one embodiment of the present invention includes an engine 12, a fuel tank 14, a pair of

traveling devices

16a and 16b, a pair of

handles

18a and 18b, an operating section 20, an auger. It includes a housing 22,

augers

24a, 24b and a chute 26.

The fuel tank 14 is provided above the engine 12 . The output from the engine 12 is changed by a transmission (not shown). Output from the transmission is transmitted to a pair of

traveling devices

16a and 16b via a pair of transmission mechanisms (not shown), and the pair of

traveling devices

16a and 16b are driven by the output from the transmission.

A pair of

handles

18a and 18b are provided so as to extend rearward and obliquely upward from below the engine 12. An operation unit 20 is provided between and near the pair of

handles

18a and 18b. An operation of the snow remover 10 is instructed by the operation unit 20 .

The auger housing 22 is provided in front of the engine 12 and the pair of

traveling devices

16a and 16b, and covers the

augers

24a and 24b. The

augers

24a and 24b are driven by the output of the engine 12 and can collect snow.

The chute 26 is connected to the top of the auger housing 22 , and the snow collected by the

augers

24 a and 24 b is hoisted up by an impeller (not shown) provided inside the auger housing 22 and thrown from the chute 26 .

Next, the structure of the auger housing 22, the

augers

24a and 24b and their vicinity will be described.

4 to 6, the auger housing 22 has a recess 28 communicating with the chute 26 in the center in the left-right direction, and has through holes 30 on both sides. A through hole 30 provided in one side portion (left side portion in this embodiment) of the auger housing 22 is provided at a position corresponding to one end portion of an auger shaft 34 (described later). Although not shown, the through hole 30 provided in the other side portion (the right side portion in this embodiment) of the auger housing 22 is similarly provided at a position corresponding to the other end portion of the auger shaft 34 . The through hole 30 is preferably larger than the profile of the shearbolt protection member 78 . That is, the through hole 30 preferably has a size that allows the shear bolt protection member 78 to be pulled out of the auger housing 22 .

The auger housing 22 is provided with an impeller shaft 32 positioned in the recess 28 (see FIG. 1). The impeller shaft 32 extends in the front-rear direction at the widthwise central portion of the auger housing 22 and is provided so as to penetrate the rear portion of the auger housing 22 . An impeller is attached to the impeller shaft 32 within the auger housing 22 . The impeller shaft 32 is connected to the engine 12 via a transmission mechanism (not shown) and rotated by the output of the engine 12 . The impeller is rotated accordingly.

The auger shaft 34 is housed inside the auger housing 22 . The auger shaft 34 extends in the left-right direction and is supported by the auger housing 22 via a plate member 60 which will be described later. The auger shaft 34 has a first key groove 36 formed in its central portion and two second key grooves 38 formed at both ends thereof.

The impeller shaft 32 and the auger shaft 34 are connected via a gearbox 40 provided in the central portion of the auger shaft 34 .

The gearbox 40 includes a case 42 and a worm gear 44. The impeller shaft 32 and auger shaft 34 are connected via a worm gear 44 . A keyway (not shown) of the worm gear 44 and the first keyway 36 of the auger shaft 34 are connected by a key 46 . Thereby, the rotation of the impeller shaft 32 is transmitted to the auger shaft 34, and the auger shaft 34 is rotated. The case 42 covers the worm gear 44 and is supported by the auger shaft 34 via

bearings

48a, 48b and

oil seals

50a, 50b. Therefore, the auger shaft 34 becomes rotatable with respect to the case 42 . Further, the case 42 is supported in the upper part of the auger housing 22 via a T-shaped connector 52 and a plate-shaped connector 54 . In this way, the gearbox 40 is fixed in the auger housing 22 substantially at the center of the auger shaft 34 .

A scraper 56 is provided at the bottom of the auger housing 22 .

Augers

24 a and 24 b are attached to the left and right sides of the gear box 40 on the auger shaft 34 . Since the auger 24a side and the auger 24b side are configured in the same manner, the auger 24a side will be described here, and the description of the auger 24b side will be omitted.

The auger 24 a is provided between the gearbox 40 and the bearing 70 (described later) and has an auger pipe 58 . The auger pipe 58 is fitted on the auger shaft 34 . That is, the auger shaft 34 is inserted through the auger pipe 58 .

A plate member 60 is detachably provided on the outer surface of the side portion of the auger housing 22 so as to cover the through hole 30 . Plate member 60 is larger than through hole 30 . Here, two arc-shaped mounting members 62 are mounted on the inner surface of the side portion of the auger housing 22 at positions corresponding to the top and bottom of the plate member 60 . By fastening the plate member 60 and the two mounting members 62 across the side of the auger housing 22 with a plurality of (in this embodiment, four) bolts 64, the plate is attached to the outer surface of the side of the auger housing 22. Member 60 is fixed. By attaching two mounting members 62 to the inner surface of the side portion of the auger housing 22, the plate member 60 can be mounted simply by tightening the bolts 64 from the outside.

Further, each bolt 64, which is a fastening member for fixing the plate member 60 to the outer surface of the auger housing 22, is not provided within the horizontal plane including the auger shaft 34. In this embodiment, in front of the auger shaft 34, bolts 64 are provided at positions 45° above and below a horizontal plane including the auger shaft 34 in a side view. A bolt 64 is provided at a position 45° upward and downward in a side view with respect to a horizontal plane including .

A bearing housing 66 is attached to the inner surface of the plate member 60 with a plurality of (three in this embodiment) bolts 68, and one end of the auger shaft 34 is supported by a bearing 70 housed in the bearing housing 66. Supported. That is, the bearing 70 is held between the bearing housing 66 and the auger shaft 34 such that the outer circumference (outer ring) of the bearing 70 is held by the bearing housing 66 and the inner circumference (inner ring) of the bearing 70 is attached to one end of the auger shaft 34 . 70 is provided. Thus, bearing 70 rotatably supports auger shaft 34 and is supported on the inner surface of plate member 60 via bearing housing 66 . A bolt 76 is attached to the end of the auger shaft 34 supported by the bearing 70 with

washers

72 and 74 interposed therebetween. As a result, the washer 72 presses the inner ring of the bearing 70 axially inward, so that the bearing 70 can be held more stably.

A shear bolt protection member 78 is fitted to such an auger shaft 34 . A shear bolt protection member 78 is provided between the auger 24 a and the bearing 70 .

5 to 8, the shear bolt protection member 78 includes a first flange portion 80 fixed to the auger shaft 34, a second flange portion 82 fitted to the first flange portion 80, a first flange portion An elastic member 84 interposed between 80 and the second flange portion 82 is included. The position of the shear bolt protection member 78 shown in FIGS. 6 to 8 is displaced by 90° with respect to the position of the shear bolt protection member 78 shown in FIG.

Further, referring to FIG. 9, the first flange portion 80 has a substantially oval flange main body 80a. A cylindrical portion 80b is provided in the central portion of the flange body 80a so as to protrude from both sides, and a key groove 80d is provided in a through hole 80c of the cylindrical portion 80b. An annular groove 80e is provided on the outer peripheral surface of the cylindrical portion 80b. Two pins 80f are provided on the flange main body 80a with the cylindrical portion 80b interposed therebetween.

Further, referring to FIG. 10, the second flange portion 82 has a substantially disc-shaped flange main body 82a. A through hole 82b and a stepped portion 82c are formed in the central portion of the flange main body 82a. The flange main body 82a is provided with two through holes 82d and two screw holes 82e with the through hole 82b interposed therebetween. Further, the flange main body 82a is provided with two recesses 82f across the through hole 82b.

Returning to FIG. 8, the elastic member 84 is made of rubber, for example, and is formed in a substantially arc shape, and is provided with a through hole 84a in its central portion. The elastic member 84 functions as a damper.

The two elastic members 84 are attached to the first flange portion 80 by fitting the pins 80 f of the first flange portion 80 into the through holes 84 a of the elastic member 84 . In this state, each elastic member 84 is fitted into the through hole 82d of the second flange portion 82, and the cylindrical portion 80b of the first flange portion 80 is fitted into the through hole 82b, whereby the first flange portion 80 becomes the second flange portion. It is attached to the flange portion 82 . At this time, the elastic member 84 and the flange main body 82a are substantially flush so that the elastic member 84 does not protrude from the surface of the flange main body 82a of the second flange portion 82. As shown in FIG. Also, by fitting a circlip 86 into the groove 80e of the first flange portion 80, the first flange portion 80 is prevented from slipping out of the second flange portion 82 (see FIG. 5).

In the shear bolt protection member 78 thus assembled, the first flange portion 80 is attached to the auger shaft 34 by fitting the key 88 into the key groove 80 d of the first flange portion 80 and the second key groove 38 of the auger shaft 34 . fixed to The second flange portion 82 is connected to the auger 24a by inserting two shear bolts 90 through the corresponding screw holes 82e of the second flange portion 82 and the auger 24a and tightening the corresponding nuts 92. As shown in FIG. That is, two shear bolts 90 are used to connect the shear bolt protection member 78 and the auger 24a.

Here, as can be seen from FIGS. 4 and 5, the shearbolt protection member 78 is attached to the auger 24a from the outside in the axial direction. To position. That is, the shear bolt protection member 78 is located outside the auger 24a in the vicinity of the auger shaft 34. As shown in FIG. In the axial direction of the auger shaft 34, the shear bolt protection member 78 is provided axially inward from the outer end of the auger 24a. This is evident from the fact that the shear bolt protection member 78 is positioned axially inward of the line E indicating the axial position of the outer end of the auger 24a in FIG.

Further, referring to FIG. 4 , the gearbox 40 side end of the auger pipe 58 and the auger shaft 34 are arranged so that the gearbox 40 side end of the auger pipe 58 can rotate with respect to the auger shaft 34 . A bushing 94 is interposed between the .

With this configuration, the rotation of the auger shaft 34 is transmitted to the auger 24a via the shear bolt protection member 78, and the auger 24a rotates as the auger shaft 34 rotates. When the auger 24a bites into a foreign object such as a stone and tries to stop during snow removal, the elastic member 84 functioning as a damper absorbs the impact at that time, thereby suppressing damage to the shear bolt 90. . The same applies to the auger 24b side.

According to the snow remover 10, when the elastic member 84 is replaced, the bearing 70 is also removed from the auger shaft 34 when the plate member 60 is removed from the outer surface of the auger housing 22. Here, since the shear bolt protection member 78 fitted to the auger shaft 34 is located outside the auger 24 a ( 24 b ) in the vicinity of the auger shaft 34 , the shear bolt protection member 78 can be removed from the maintenance through hole 30 of the auger housing 22 . 78 is visible and shear bolt protection member 78 is directly accessible through through hole 30 without removing auger 24 a ( 24 b ) from auger shaft 34 . Therefore, it is possible to shorten the time required for replacing the elastic member 84 included in the shear bolt protection member 78, and reduce the work and maintenance costs.

By using the bearing housing 66 that holds the outer periphery of the bearing 70 and is attached to the inner surface of the plate member 60, the plate member 60, the bearing housing 66, and the bearing 70 can be integrally disassembled and assembled with the snow blower 10, Maintenance work time can be shortened.

Since the puller can be removed from the recess 82f of the second flange portion 82, the puller can be removed when removing the second flange portion 82 from the snow remover 10, and the maintenance work time can be shortened.

Since each bolt 64 is not provided in a horizontal plane including the auger shaft 34, the bolts 64 do not become an obstacle when accessing the auger shaft 34 from the front, that is, through the opening of the auger housing 22. Disassembly and assembly operations are further facilitated.

In the axial direction of the auger shaft 34, the shear bolt protection member 78 is provided axially inward from the outer end of the auger 24a (24b), so that the auger 24a (24b) rakes snow in the vicinity of the shear bolt protection member 78 as well. can perform snow removal work.

A first keyway 36 for the gearbox 40 is formed in the central portion of the auger shaft 34 and a second keyway 38 for the first flange portion 80 is formed at the end of the auger shaft 34 so that the auger shaft 34 , the distance between the first keyway 36 and the second keyway 38 can be increased. Therefore, the shaft torsion strength against impact load can be improved.

Fig. 11 shows the torsional test results of the auger shaft.

In the snow blowers of Comparative Examples 1 and 2, the first key groove is formed in the central portion of the auger shaft, the second key groove is formed in the vicinity of the first key groove, and the distance between the key centers in Comparative Example 1 is 56. 7 mm, and the key center distance of Comparative Example 2 was 105.5 mm. On the other hand, in the snow blowers of Examples 1 and 2 according to the present invention, the first key groove is formed at the central portion of the auger shaft, the second key groove is formed at the end portion of the auger shaft, and the key groove of the first embodiment is formed. The center-to-center distance was 264.5 mm, and the key center-to-center distance for Example 2 was 310.9 mm. Comparative Example 1 and Example 1 were tested under the same conditions except that the position of the second keyway provided on the auger shaft was different, that is, the distance between the key centers was different. Similarly, Comparative Example 2 and Example 2 were tested under the same conditions except for the position of the second keyway provided on the auger shaft, that is, the distance between the key centers.

As a result of the experiment, the torsion angle and rotational torque when the elastic member of the shear bolt protection member was damaged were 25.2° and 385.4 N·m in Comparative Example 1, whereas in Example 1 was 40.8° and 238.3 N·m. Therefore, the torsion angle was improved by 162%, the stress relaxation rate was 162% due to the decrease in rotational torque, and the strength index of rotational torque was improved from 2.1 times to 3.2 times. Further, in Comparative Example 2, the values were 29.0° and 482.5 N·m, whereas in Example 2, the values were 56.0° and 250.1 N·m. Therefore, the torsion angle was improved by 193%, the stress relaxation rate was 193% due to the decrease in rotational torque, and the strength index of rotational torque was improved from 1.7 times to 3.1 times.

From this result, it can be seen that the snow blower 10 can improve the axial torsional strength against impact load.

In the above-described embodiment, the case of having the first keyway 36 and the second keyway 38 has been described, but splines may be used instead of the keyway.

Also, in the above-described embodiment, the case where the second flange portion 82 has the recess 82f has been described, but the present invention is not limited to this. A female thread 96a may be formed instead of the recess 82f as in the second flange portion 96 shown in FIG. In the second flange portion 96, screw holes 96b are formed in place of the screw holes 82e, and two recesses 96d are formed in the flange main body 96c on the side of the first flange portion so that the female screw 96a and the screw hole 96b are formed. The portion where 96b is formed is formed thin. Other configurations of the second flange portion 96 are the same as those of the second flange portion 82 .

Also in such a second flange portion 96, the female thread 96a can be removed with a puller, so that the puller can be removed when removing the second flange portion 96 from the snow remover, and the maintenance work time can be shortened. Also, a male thread may be formed instead of the female thread 96a. Similar effects can be obtained in this case as well.

Although preferred embodiments of the present invention have been described above, it is clear that various modifications can be made without departing from the scope and spirit of the present invention. The scope of the invention is limited only by the appended claims.

REFERENCE SIGNS LIST 10 snowplow 22

auger housing

24a,

24b auger

30, 80c, 82b, 82d, 84a through hole 34 auger shaft 36 first key groove 38 second key groove 40

gear box

46, 88 key 48a, 48b, 70 bearing 60

plate member

64, 68, 76 bolt 66 bearing housing 78 shear bolt protection member 80

first flange portion

82, 96 second flange portion 82f recess 84 elastic member 90 shear bolt 96a female screw

Claims

auger shaft;
an auger housing containing the auger shaft and having a through hole provided at a position corresponding to the end of the auger shaft;
a gearbox provided at the center of the auger shaft;
a plate member detachably provided on the outer surface of the auger housing so as to cover the through hole;
a bearing that rotatably supports the auger shaft and is supported on the inner surface of the plate member;
an auger mounted on the auger shaft and disposed between the gearbox and the bearing;
a shear bolt protection member fitted to the auger shaft and provided between the auger and the bearing;
A shear bolt that connects the shear bolt protection member and the auger,
The shear bolt protection member includes a first flange portion fixed to the auger shaft, a second flange portion fitted to the first flange portion and connected to the auger by the shear bolt, and the first flange portion. and an elastic member interposed between said second flange portion.
The snow blower according to claim 1, further comprising a bearing housing that holds the outer periphery of the bearing and is attached to the inner surface of the plate member.
The snow remover according to claim 1 or 2, wherein the second flange portion has a recess or a screw.
a fastening member for securing the plate member to the outer surface of the auger housing;
The snow blower according to any one of claims 1 to 3, wherein said fastening member is not provided in a horizontal plane including said auger shaft.
The snow remover according to any one of claims 1 to 4, wherein the shear bolt protection member is provided axially inward from the outer end of the auger in the axial direction of the auger shaft.
The auger shaft includes a first key groove formed in the central portion of the auger shaft for fixing the gearbox, and a first key groove formed at the end portion of the auger shaft for fixing the first flange portion. 6. A snow blower according to any one of claims 1 to 5, having two keyways.