JP3159879B2 - Automatic stop device for snowplow auger obstacles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snowplow for removing snow using an auger mounted in front of a vehicle body, and more particularly to a device for automatically stopping when an obstacle in the snow contacts the auger.

[0002]

2. Description of the Related Art Conventionally, in a snowplow that removes snow using an auger of this type, when there is an obstacle in the snow, the obstacle comes into contact with an auger mounted in front of a vehicle body and the auger is forced. If the auger is damaged, the auger may be damaged. To prevent this, a shear pin was attached to the connection between the auger drive shaft and the auger blade, and the auger blade was overloaded by obstacles in the snow. Sometimes, the shear pin is broken to stop the auger.

[0003]

As described above, in the conventional auger stopping device for a snowplow, when an obstacle is present in the snow, the auger is overloaded by the obstacle and the auger shaft and the auger blade are moved. Since the shear pin provided at the connection part with was to break and stop the rotation of the auger blade, in the repair work, first remove the obstacle, then after replacing with a new shear pin,
Since the snow removal operation is restarted, there is a problem that a lot of time (loss time) is wasted in the snow.

The present invention solves the above-mentioned problems of the prior art, and provides an apparatus for automatically stopping an auger when it comes into contact with an obstacle in the snow without using a shear pin in the above conventional example. It is intended to be.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a first aspect of the present invention is a snowplow equipped with an auger mounted in front of a vehicle body, wherein a roll is provided on one side of an auger shaft on which auger blades are mounted. A bearing clutch is mounted, and the rolling bearing clutch is fixed to one side by a spring along the inner wall of the outer casing which is fixed to the start transmission shaft in the rotation direction and has a conical raceway surface and is continuous with the auger shaft. A roller is provided between the outer race and the outer race, which is pressed and supported so as to be movable in the axial direction and whose raceway surface is formed in a conical shape, with its rotation axis inclined with respect to the generating line of the raceway surface formed on the outer periphery of the inner race. The inner race and the outer race, each having a conical raceway surface forming the rolling bearing clutch, are opposed to each other two by two so that the inclination of the raceways of the inner race and the outer race is plane-symmetric. Katsuko And juxtaposed et a plurality axial direction is characterized in that it is equipped.

Further, the invention of claim 2 provides an inner race and a conical raceway surface constituting a rolling bearing clutch.
Two inner rings, two of which are mounted back-to-back so that the inclination of the raceway surface of the outer ring is plane-symmetric, are fixed to the starting drive shaft in the rotational direction by abutting each other, and a plurality of these are arranged in the axial direction. 2 and corresponding to the two inner rings contacted with each other
The outer races, which are opposed to each other back-to-back and mounted in parallel with each other, have both outer races located at both ends abutted against one side wall of the outer casing and a member pressed by a spring on the other side, respectively. The two outer rings at the intermediate portion are mounted on the inner wall of the outer casing such that two adjacent outer rings abut against each other so that the forces acting in the axial direction are opposed to each other.

[0007]

The present invention is configured as described above.
According to the first aspect of the present invention, the following operation occurs. During snow removal work by rotating the inner ring of a rolling bearing clutch driven by an external force (external power) in the clutch engagement direction, when an obstacle in the snow contacts an auger in front of the vehicle body, the rolling connected to the auger shaft. Since the load to stop the rotation is applied to the outer ring of the bearing clutch, the inner ring driven by the above-mentioned external force tries to rotate the outer ring with a stronger torque, so that the outer ring is reduced so that the thickness between the raceway surfaces of both wheels is reduced. to try to move in the axial direction, but the outer race is a movement in the axial direction to the spring
Therefore, since the pressing force is limited by the pressing force, the rotational torque of the inner wheel driven by the external force is interrupted by the slipping effect overcoming the engaging effect due to the friction between the inner surface of the inner and outer wheels and the contact surface between the roller and the outer wheel. , The rotational torque is not transmitted to the auger shaft connected to the outer casing on which the outer ring is mounted, and the rotation of the auger is stopped. The driver can then stop the auger or retract the auger to remove the obstacle.

At this time, since the transmission of the rotational torque is performed by dispersing (dividing) the plurality of inner and outer wheels arranged side by side, the abrasion due to the slip action between the inner and outer wheels and the rollers is also arranged. In addition, the inner and outer wheels are averaged to reduce the amount of wear per piece.

According to the second aspect of the present invention, a plurality of the two abutting back-to-back abutments are arranged side by side to form a starting transmission shaft.
In correspondence with each inner ring fixed in the rotation direction , two outer rings which are opposed to each other two by two and are arranged side by side are mounted on the inner wall of the outer casing. The outer casing is brought into abutment with two adjacent members back to back so that the forces acting in the axial direction of the outer races in the intermediate portion are opposed to each other by contacting the side wall and the member pressed by the spring on the other side. When a load is applied to stop rotation of the outer ring when an obstacle in the snow comes in contact with the auger, by adjusting the pressing elasticity of the member pressed by the spring, the outer ring Since the manner of the axial movement can be changed, it is possible to easily adjust the magnitude of the rotational torque when the slip between the inner and outer wheels and the roller occurs, as described above.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front sectional view of an auger of a snowplow of the present invention, FIG. 2 is an enlarged sectional view of a main part of FIG. 1, and FIG. 3 (a) is a side view of the entire snowplow provided with the auger. (B) is a front view.

As shown in FIG. 3, in the snowplow, an auger (device) 12 is detachably mounted by a hydraulic operation in front of a vehicle body 11 having a driver's seat.
An auger blade 14 driven by a drive source 13 mounted on the top is mounted on an auger shaft supported at both ends.

As shown in FIG. 1, the auger blade 14 is mounted on an auger shaft 21 via an auger blade arm 15, and a non-drive side of the auger shaft 21 has one end (the right end in the drawing) bearing. The drive side is supported by a start transmission shaft 24 via a rolling bearing clutch 23. The start transmission shaft 24 is connected to a start shaft 26 via a bolt 25 instead of a conventionally used shear pin. It is connected to. The drive source 13 (FIG. 3) is provided at the end of the starting shaft 26.
A sprocket 27 driven via a chain (not shown) is attached via a bolt 28, and the starting shaft 26 is supported by the outer case 29 via a bearing case 29a and a support bearing 29b. In the figure, reference numeral 30 denotes an oil seal.

[0013] Bearing clutch 23 rolling described above, as shown in the enlarged sectional view of FIG. 2, the desired start transmission shaft 24
The inner ring stopper 36 is slidably fitted by means (not shown).
Crowded an inner ring 31 formed in a conical shape to be rotationally fixed and the raceway surface is, along the inner wall of the outer casing 32 which is integrally connected to the auger shaft 21, on one side by the spring 33 (left side in the figure) An outer ring 34 movably mounted and having a conical raceway surface, and an inner ring 31 and an outer ring 34;
In the annular space between the two raceways, the rotation axis is inclined at a fixed angle with respect to the generating line of the raceway formed on the outer periphery of the inner ring 31 (refer to straight lines at each position of the curved surface drawn by the movement of the straight line). And a roller 35 provided. The inner ring 31 has a raceway surface 31 formed in a conical shape.
The two a and 31b are abutted against each other so as to be plane symmetric, and are fixed in the rotational direction to the starting transmission shaft 24 via the inner ring stopper 36. , A plurality of inner races 31 fixed in the rotation direction are arranged side by side in the axial direction at a constant interval.

On the other hand, the driving side of the inner ring 31 (left side in the figure)
Outer race 3 corresponding to the raceway surface 31a of the
4a is in contact with the inner surface of the drive side (left side in the figure) side wall 32a of the outer casing 32, and corresponds to the raceway surface 31b of the inner ring 31 on the non-drive side (right side in the figure) via a roller 35b. The outer ring 34b is disposed to face the outer ring 34a at an interval with the above-mentioned outer ring 34a, and is disposed on the drive-side raceway surface 31c of the inner race 31 adjacent to the inner race 31 having the raceway surface 31b at a fixed interval with a roller 35c interposed therebetween. Corresponding outer ring 34
c, and are mounted so as to be axially movable along the inner wall of the outer casing 32 in contact with each other.

As described above, the interval (space) between the pair of inner races 31 abutting against each other, which are mounted side by side, and the corresponding outer race 34 abut against each other. The two spaces (spaces) including the two are arranged so as to alternately face each other as shown in the figure, and one of the outer rings located at both ends, that is, the outer ring 34a on the drive side is the same as described above. So that it is in contact with the side wall 32a of the outer casing 32,
The other, that is, the outer ring 34e on the non-drive side (right side in the figure) is
3 is in contact with the pressing spring base 37 pressed by the pressing member 3. In this way, the forces acting in the axial direction on the pair of outer rings (for example, 34b and 34c) abutting against each other are offset in directions facing each other. In the drawing, 38a is a tightening bolt, 38b is a nut, 39 is a spring pressing plate, 40
Is an outer ring stopper, 40a is a roller case, 41 is an auger fixing bolt, 42 is a starting shaft fixing seat, 43 is a main body snow cutting case, and 44 is a bearing cover.

Next, the operation will be described. FIGS. 4A and 4B are explanatory drawings showing the operation principle of a conventionally known rolling bearing clutch (one-way clutch), wherein FIG.
(B) is a development view of a roller holder and a roller. In the drawing, reference numeral 1 denotes a driving side element integrated with the shaft 2;
Its outer peripheral surface is formed in a conical surface 5, while the driven element 3
Is formed in a conical surface 6 having the same conical angle (vertical angle) as the conical surface 5, and an annular space 7 having a uniform thickness is formed between the conical surfaces 5 and 6. A large number of barrel-shaped rollers 9 supported by a retainer 8 therein are accommodated with their axial directions inclined at a fixed angle θ with respect to the generatrix directions of the conical surfaces 5 and 6. In the figure, 10a and 10b are enclosing plates arranged so that the retainer 8 does not escape, and 10c is a spring that urges in a direction to decrease the thickness T of the annular space 7.

Now, when the shaft 2 is to be rotated in the direction of the arrow S, the element 1 tries to roll the roller in the direction of the arrow P, whereby the element 1 is moved in the direction Q. The rolling of the roller 9 continues until the thickness T of the space 7 does not allow the rolling of the roller 9 due to the above movement of the element 1, and when the rolling of the roller 9 stops, the two elements 1 and 3 are integrated. And
The rotation of the shaft 2 is transmitted to the shaft 4 and acts as a clutch.
Then, when the shaft 2 is rotated in the direction of the arrow S ', the rolling of the roller 9 moves the element 1 in the direction opposite to the arrow Q, so that the above-mentioned thickness T is enlarged. Is released and becomes free (free rotation).

In the above description, the element 1 is the driving side and the element 3 is the driven side. However, if the element 3 is rotated in the M direction, the rotation of the element 3 is transmitted to the element 1 as a clutch, and When rotated in the direction M ', the connection between the element 3 and the element 1 is released, and the element 3 becomes free. (See Japanese Utility Model Publication No. 42-7523.) A rolling bearing clutch of this type in which each raceway surface of the inner and outer rings is configured to have a hyperbolic cross section that is in contact with the entire length of the roller (sprag) (Japanese Patent Publication No. Sho 46-523). 21
No. 126) already belongs to the public domain.

As described in the operation principle of this type of rolling bearing clutch, in the embodiment of the present invention,
When the roller 35a is arranged to be inclined in the direction of the two-dot chain line in FIG. 2, during operation, the sprocket 27 and thus the inner ring 31 are moved from the external power source 13 via a chain (not shown).
When rotated clockwise as viewed from the right side of the figure, the raceway surface 31
The inner ring 31 having a moves to the left in FIG. 2 (in a direction to reduce the thickness between the raceway surfaces of both wheels) , and the rolling bearing clutch acts as a clutch.

Similarly, the roller 35b, which is arranged obliquely in the direction of the two-dot chain line in FIG. 2, moves rightward in FIG. 2 (a direction in which the thickness between the raceway surfaces of the two wheels decreases). The rolling bearing clutch acts as a clutch. At this time, the outer ring 34b receives a rightward force in the drawing via the roller 35b, but the adjacent outer ring 34c is brought into contact with the raceway surface 31.
Since the force in the left direction in the figure is received by the inner ring having c and the roller 35c, these two forces oppose each other and are balanced and canceled, and are held at that position.

The single outer ring 34e located at the end on the non-drive side (right side in the figure) receives a rightward force in the figure via the inner ring and the roller 35e, similarly to the outer ring 34b. Since the pressing spring base 37 urged by the spring 33 whose elasticity is adjusted by the tightening bolt 38a and the nut 38b is pressed leftward in the drawing,
It is held at a position balanced with its elasticity. Spring 3 at this time
The elasticity of (3) is adjusted to such an extent that the clutch action of the rolling bearing clutch slips when a shear pin conventionally used for the bolt 25 is broken.
In this manner, the plurality of inner races 3 arranged in parallel in the axial direction
1. The auger shaft 21 integrated with the outer casing 32 is driven through the outer ring 34 by the clutch action of the outer ring 34 and the roller 35, and the auger blade 14 is rotated to perform the snow removing operation.

Next, when the auger blade 14 comes into contact with an obstacle in the snow, a load is applied to the auger shaft 21, so that a large torque (rotational force) is applied to the outer ring 34 of the rolling bearing clutch 23, and the outer ring 34 tries to maintain the clutch operating to move the larger axial direction, each of the other outer ring of the other outer ring 34e of the end portion of the non-driven side, the pressing spring force
, The rotational torque applied from the sprocket 27 via the starting transmission shaft 24 is applied to the stopped auger shaft 21 by friction at the contact surface between each inner ring and outer ring and the roller. Hitting the engagement action
It wins and becomes slip (slipping) and turns into heat. The timing and manner in which the slip action occurs can be changed by adjusting the elasticity of the spring 33 pressing the outer ring located at the end.

According to this embodiment, the rolling bearing clutch is mounted on one side of the auger shaft on which the auger blade is mounted, and when the rolling bearing clutch comes into contact with an obstacle, the contact surface between the inner ring and the outer ring constituting the rolling bearing clutch and the roller. The auger is stopped by slipping, and the driver stops the auger or retreats according to the situation and removes the obstacle, thereby eliminating the need for the conventional pin for the snowplow. Not only can the safety protection effect be reliably performed, but also the work can be resumed immediately after the removal of the obstacle, so that the work efficiency can be improved.

Further, the outer races corresponding to the inner races abutted two by two so that the raceway surfaces are plane-symmetrical, so that the directions of the forces acting in the axial direction are opposed to each other, so that they are offset from each other. Since two or more pieces are arranged side by side,
The support structure for each outer ring can be simplified. In addition, the rotational torque is dispersed by arranging a plurality of inner rings and outer rings, so that the contact between the auger and the obstacle, the slip action between each inner / outer ring and the rollers in the rolling bearing clutch at the time of stoppage, can be reduced. The amount of wear based on this is also small.

[0025]

As described above, according to the present invention,
In the invention of claim 1, a rolling bearing clutch is mounted on one side of the auger shaft to which the auger blade is mounted, and the inner ring and the outer ring in which the raceway surfaces constituting the rolling bearing clutch are formed in a conical shape, By mounting two or more of them so that the inclination of the raceway surface of the outer ring is face-symmetrical and two or more of them are arranged side by side in the axial direction, when an obstacle comes into contact with the auger blade, a clutch action is performed. However, since the auger stops temporarily due to the slip action of the contact surface between the inner and outer wheels and the rollers, the driver can stop or retreat to remove the obstacle by stopping or retreating the auger, which has been used in this type of snowplow. Without using a shear pin, not only does the auger safety protection function at the time of contact with an obstacle be ensured, but also immediately after removal of the obstacle without replacing any parts Because the work can be resumed, it is possible to improve the work efficiency.

Further, since the above-mentioned slip action is distributed between the inner ring and the outer ring, which are mounted in parallel in a plurality of axial directions, wear per one piece due to the slip action can be reduced.

According to the second aspect of the present invention, the inner race and the outer race having the conical raceway surfaces of the rolling bearing clutch are formed so that the inclination of the raceways of the inner race and the outer race is plane-symmetric. The two inner rings mounted two by two back to back are abutted with each other and fixed in the rotational direction to the start transmission shaft, and a plurality of these are mounted side by side in the axial direction. Correspondingly, two outer races, two of which are opposed to each other back-to-back and are mounted side by side, are mounted on both sides of the outer races at both ends on one side wall of the outer casing and a member pressed by a spring on the other side. Abut,
The two outer rings at the intermediate portion are attached to the inner wall of the outer casing by abutting two adjacent two back to back so that the forces acting in the axial direction are opposed to each other, so that the inner and outer rings contact the rollers. Not only is the wear due to the slip action of the part small, but also the outer rings arranged side by side are mounted by abutting two by two in a direction in which the forces acting in the axial direction cancel each other. The structure for mounting these outer rings and the inner wall of the outer casing is simplified, and the mounting work is facilitated.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an auger showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 shows the entire snowplow equipped with the auger of the present invention,
(A) is a side view, (b) is a front view.

FIGS. 4A and 4B are explanatory diagrams showing the operating principle of the rolling bearing clutch, wherein FIG. 4A is a longitudinal sectional front view, and FIG. 4B is a developed view of a roller retainer and rollers.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Body 12 Auger 13 External drive source 14 Auger blade 15 Auger blade arm 21 Auger shaft 22 Bearing 23 Rolling bearing clutch 24 Starting transmission shaft 25 Bolt 26 Starting shaft 27 Sprocket 29 Outer case 30 Oil seal 31, 31a, 31b, 31c Inner ring 32 Outer casing 32a Side wall 33 Spring 34, 34a, 34b, 34c, 34e Outer ring 35, 35a, 35b, 35c, 35e Roller 36 Inner ring stopper 37 Holding spring stand 38a Tightening bolt 39 Spring pressing plate 40 Outer ring stopper 42 Activating shaft stopper seat 43 Body snow-cutting case 44 Bearing cover

Continuation of the front page (56) References JP-A 63-141219 (JP, U) JP-A 64-24127 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E01H 5 / 09

Claims (2)

(57) [Claims] In a snowplow equipped with an auger in front of a vehicle body, a rolling bearing clutch is mounted on one side of an auger shaft to which an auger blade is mounted, and the rolling bearing clutch is fixed to a start transmission shaft in a rotational direction. The raceway surface is formed in a conical shape by being pressed to one side by a spring along the inner wall of the outer casing connected to the auger shaft and supported movably in the axial direction, and the raceway surface being formed in a conical shape. A roller is provided between the outer ring and the roller so that its rotation axis is inclined with respect to the generating line of the raceway surface formed on the outer periphery of the inner ring, and the raceway surface constituting the rolling bearing clutch is formed in a conical shape. The inner ring and the outer ring are mounted two-by-two facing each other so that the inclination of the raceway surfaces of the inner ring and the outer ring is plane-symmetrical, and a plurality of these are mounted side by side in the axial direction. Car Automatic stopping device due to obstacles of the helmet. 2. An inner ring and a pair of inner rings which are mounted back-to-back so that the inclinations of the raceways of the inner race and the outer race are concentric with each other. Then, a plurality of these are fixed to the starting transmission shaft in the rotational direction, and a plurality of these are mounted side by side in the axial direction. The outer races mounted side by side are brought into contact with both outer races located at both ends against one side wall of the outer casing and a member pressed by a spring on the other side, and the outer races in the intermediate portion act in the axial direction. 2. The automatic stop device for an auger of a snowplow according to claim 1, wherein two adjacent members are mounted on the inner wall of the outer casing such that two adjacent members are abutted against each other so that opposing forces are opposed to each other. .