JP2007056444A - Snow blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a snow removing part to be simply operated by solving the problem that the operation of hoisting and lowering the snow removing part and the operation of rotating it are complicated, and to enable the operation of returning the snow removing part to be rapidly performed by solving the problem that much labor is required for the return operation of returning the snow removing part to an initial position (original position). <P>SOLUTION: In this snow blower, the snow removing part (snow-removing operation part) 13 is provided in the front of a machine body 19, and an operation part 40 which is provided in the rear of a machine body 19 is equipped with a snow-removing-part attitude operating member (auger-housing attitude operating lever) 55 for operating the vertical motion and horizontal tilting motion of the snow removing part 13. The member 55 is arranged on one side of the operation part 40, and a return member (reset switch) 54 for returning the snow removing part 13 to the initial position is arranged near the member 55. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a snow removal machine that includes an engine-driven snow removal unit that performs snow removal work on a machine body, and that is configured to allow the machine body to run independently.

As a snowplow, what has left and right operation handles extended behind the machine and an operation unit for operating the machine is provided between these operation handles is practically used.
Practical snow blowers have an operation lever that operates the snow removal part consisting of an auger and shooter in the operation part, a throttle lever that adjusts the output of the engine, and a direction speed that sets the traveling direction of the machine and adjusts the speed of the machine It was practically sufficient to arrange the lever (front / rear speed adjusting lever) appropriately.

As an operation part of such a snowplow, there is known one in which a traveling system operating member that causes the machine to travel is arranged in the center of the operating part, and a work system that performs snow removal work is divided into left and right of the traveling system ( For example, see Patent Document 1.)
Japanese Patent Laid-Open No. 10-219643 (page 5, FIG. 3)

  FIG. 16 is a diagram for explaining a conventional basic configuration. The operation unit 201 of the snowplow 200 sets a direction of movement of the machine at the center of the operation panel 202 and adjusts the speed of the machine (front-rear speed adjustment). Lever) 203 is provided, and a lift / rotation operation lever (joystick) 204 for operating the snow removal unit (not shown) and rotation of the machine body is provided to the right of the directional speed lever 203, and snow removal is provided to the left of the operation panel 202. A changeover switch 205 for switching the rolling operation of the part to manual or automatic is provided, and an adjustment knob 207 for adjusting the rolling of the snow removal part is provided.

  However, in the snow removal machine 200, during the snow removal work, the snow removal unit (not shown) is moved up and down in the left area of the operation panel 202, and the snow removal unit is rotated in the right area of the operation panel 202. There is a problem that the operation of the snow removal unit becomes complicated.

  Further, in the snow removal machine 200, when the snow removal part is raised and the snow removal part is rotated during the snow removal operation, the snow removal part is returned to the initial position (original position) and the snow removal part is returned to the horizontal position. The two members of the rotation operation lever 204 and the adjustment knob 205 have to be operated, and there is a drawback that it takes time to perform a return operation of the snow removal unit.

  That is, there is a demand for a snow remover that can easily (simplely) operate the snow removal unit and quickly return the snow removal unit to the initial position.

  The present invention solves the complicated lifting and rotating operations of the snow removal unit, provides a snow remover capable of simply operating the snow removal unit, and returns the snow removal unit to the initial position (original position). It is an object of the present invention to provide a snow remover that solves the troublesome work of the return operation to be performed and can quickly perform the return operation of the snow removal unit.

  The invention according to claim 1 is provided with a snow removal part at the front part of the machine body and an operation part at the rear part of the machine body, and provided with a snow removal part posture operation member for operating the snow removal part in vertical and horizontal directions. The snowplow is characterized in that a snow removal unit posture operation member is arranged on one side of the operation unit, and a return member for returning the snow removal unit to the initial position is arranged in the vicinity of the snow removal unit posture operation member.

  For example, if the operation of the snow removal unit can be performed simply, it is convenient because the burden of the snow removal work can be reduced, and it is said that the operation of returning the snow removal unit to the initial position can be performed quickly. This is preferable because the work efficiency of snow removal can be improved.

That is, by providing a return member that returns the snow removal portion to the initial position, the operation of returning the snow removal portion to the initial position can be performed quickly.
In addition, a snow removal unit posture operation member is arranged on one side of the operation unit, and a return member for returning the snow removal unit to the initial position is arranged in the vicinity of the snow removal unit posture operation member, thereby operating the snow removal unit. Concentrate on a specific part of the operating section.

The invention according to claim 2 is characterized in that the return operation member is arranged on the left rear side of the snow removal portion posture operation member.
For example, when it is assumed that the return operation member is placed to the right of the snow removal part posture operation member, and an operation member such as a joystick is used for this snow removal part posture operation member, the joystick is operated with the right hand. There is a risk of hitting the return operating member.
Therefore, by arranging the return operation member on the left rear side of the snow removal portion posture operation member, it is possible to avoid touching the return operation member during the operation of the snow removal portion posture operation member.

In the invention according to claim 1, since the return member for returning the snow removal portion to the initial position is provided, the operation of returning the snow removal portion to the initial position can be performed quickly. As a result, there is an advantage that the work efficiency of snow removal can be improved.
In addition, a snow removal part posture operation member is arranged on one side of the operation part, and a return member for returning the snow removal part to the initial position is arranged in the vicinity of the snow removal part posture operation member, so that the operation of the snow removal part is operated. You can concentrate on a specific part of the department. As a result, there is an advantage that the operation of the snow removal unit can be performed simply and the burden of snow removal work can be reduced.

  In the invention which concerns on Claim 2, it can avoid touching the operation member for a return during operation of a snow removal part attitude | position operation member by arrange | positioning to the left rear of a snow removal part attitude | position operation member. As a result, there is an advantage that it is possible to prevent erroneous operation of the return operation member.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction viewed from the operator, Fr is front, Rr is rear, Le is left, Ri is right Indicates.
FIG. 1 is a side view of a snowplow according to the present invention. FIG. 2 is a schematic plan view and control system diagram of the snowplow according to the present invention.

  As shown in FIGS. 1 and 2, the snowplow 10 is attached to a traveling frame 12 having left and right traveling units 11 </ b> L and 11 </ b> R so that the rear portion of the vehicle body frame 15 can be rotated. A snow removal unit) 13 and an engine 14 that drives the snow removal working unit 13, and an elevating drive mechanism 16 that swings the vehicle body frame 15 up and down about the rear part as an axis, and two left and right from the rear part of the traveling frame 12 to the upper rear part. The operation handles 17L and 17R are extended, and the walking handles are equipped with grips 18L and 18R at the tips of the operation handles 17L and 17R.

The vehicle body 19 is configured by combining the traveling frame 12 and the vehicle body frame 15.
The traveling frame 12 includes left and right electric motors 21L and 21R that drive the traveling units 11L and 11R.
The left and right traveling units 11L and 11R include left and right crawler belts 22L and 22R, left and right drive wheels 23L and 23R disposed at the rear as traveling wheels, and left and right rolling wheels 24L and 24R disposed at the front. .

The left crawler belt 22L is driven through the left driving wheel 23L by the driving force of the left electric motor 21L.
The right crawler belt 22R is driven via the right drive wheel 23R by the driving force of the right electric motor 21R.

  The snow removal working unit 13 houses an auger 27 in an auger housing 25, a blower case 26 is integrally provided on the back surface of the auger housing 25, a blower 28 is housed in the blower case 26, and a shooter 29 is placed above the blower case 26. Is provided.

As shown in FIG. 1, the engine 14 drives the snow removal working unit 13 via the electromagnetic clutch 31 and the transmission mechanism 32.
The transmission mechanism 32 transmits power from the electromagnetic clutch 31 attached to the crankshaft 14a of the engine 14 to the auger transmission shaft 33 by a belt.
The power of the engine 14 is transmitted to the auger 27 and the blower 28 through a path of the crankshaft 14 a → the electromagnetic clutch 31 → the transmission mechanism 32 → the auger transmission shaft 33.

The snow scraped up by the auger 27 is jumped up by the blower 28, and the jumped up snow is thrown through the shooter 29.
The auger housing 25 includes a scraper 35 and left and right sleds 36L and 36R at the rear lower end.

The elevating drive mechanism 16 is an actuator configured to advance and retract the piston from the cylinder.
This actuator is an electric hydraulic cylinder in which a piston is extended and contracted by an electric motor 16a (see FIG. 2).
The electric motor 16 a is a drive source for the lift drive mechanism 16 that is integrated into the side of the cylinder of the lift drive mechanism 16.

The snow remover 10 is configured to attach an auger housing 25 and a blower case 26, more specifically, a snow removal working unit 13, to a traveling frame 12 so as to be able to roll (tilt), and to tilt the auger housing 25 left and right by a rolling drive mechanism 38. Has been.
Specifically, the auger transmission shaft 33 extending forward and backward is rotatably supported by the auger housing 25 and the blower case 26. The blower case 26 is attached to the front end portion of the vehicle body frame 15 so as to be rotatable left and right (tiltable).

As described above, the traveling frame 12 has a configuration in which the vehicle body frame 15 is attached. Thereby, the auger housing 25 and the blower case 26 (snow removal working part 13) are attached to the traveling frame 12 so as to be tiltable.
Thereby, the auger housing 25 can be lifted and lowered with respect to the traveling frame 12.

The rolling drive mechanism 38 is an actuator configured to advance and retract the piston from the cylinder.
This actuator is an electric hydraulic cylinder that expands and contracts a piston by driving an electric motor 38a (see FIG. 2).
The electric motor 38 a is a drive source for the rolling drive mechanism 38 that is integrated into the side of the cylinder of the rolling drive mechanism 38.

By the way, an operation unit 40, a control unit (ECU) 61, and a battery 62 are arranged between the left and right operation handles 17L and 17R.
Hereinafter, the operation unit 40 will be described.

FIG. 3 is a perspective view of the operation unit of the snowplow according to the present invention, and FIG. 4 is a plan view of the operation unit of the snowplow according to the present invention.
The operation unit 40 includes an operation box 41 provided between the left and right operation handles 17L, 17R, a travel preparation lever 42 provided on the left operation handle 17L in the vicinity of the grip 18L, a left turning operation lever 43L, and a grip 18R. And a right turning operation lever 43R attached to the right operation handle 17R.

The travel preparation lever 42 is a travel preparation member that acts on the switch 42a (see FIG. 2), and the switch 42a is turned off when the free spring shown in FIG.
If the travel preparation lever 42 is grasped with the operator's left hand and lowered to the grip 18L side, the switch 42a is turned on.

The left and right turning operation levers 43L and 43R are turning operation members that are respectively operated by the hands holding the left and right grips 18L and 18R, and are mechanisms that act on the corresponding turning switches 43La and 43Ra (see FIG. 2).
When these left and right turning operation levers 43L and 43R are brought into a free state shown in the figure by the pulling action of the return spring, the turning switches 43La and 43Ra are turned off.

If the operator turns the left turning lever 43L with the left hand and raises it to the grip 18L side, the left turning switch 43La is turned on.
The same applies to the right turning switch 43Ra. In this manner, whether or not the left and right turning operation levers 43L and 43R are being gripped is detected by the turning switches 43La and 43Ra.

Referring to FIG. 2, the operation box 41 includes a main switch 44 and an auger switch 45 (also referred to as a “clutch operation switch 45”) as a drive instruction switch on the back surface 41 a (worker side surface).
The engine 14 (see FIG. 2) is started by turning on the main switch 44. The auger switch 45 is a manual switch that switches the electromagnetic clutch 31 (see FIG. 2) on and off, and includes, for example, a push button switch.

Further, the operation box 41 has, on its upper surface 41b, a mode changeover switch (mode setting switch) 51, a throttle lever 52 as an adjustment member, a direction speed lever 53, a reset switch (return command operation unit) 54 as a return member, The auger housing posture operation lever 55 and the shooter operation lever 56 as snow removal portion posture operation members are arranged in this order from the left side to the right side.
That is, in the upper surface 41b of the operation box 41, the directional speed lever 53 is disposed on the left side of the vehicle width center CL, and the reset switch 54 is disposed on the right side of the vehicle width center CL.

The mode changeover switch 51 is a manual changeover switch for switching the traveling control mode in the control unit 61 (see FIG. 2), and a rotary switch is used as an example.
The knob 51a is turned counterclockwise to switch to the first control position P1, the second control position P2, and the third control position P3.
When switching to these positions P1, P2 and P3, the mode switch 51 outputs a corresponding switch signal.

  That is, the mode changeover switch (mode setting switch) 51 is a switch that can set the snow removal mode (snow removal work mode) according to the level of proficiency in the snow removal work of the worker and the state of snow to be removed.

  Specifically, the first control position P1 is a manual position and the second control position P2 is a power position. In the first control position manual (manual position) P1, the engine speed, the throttle opening degree, and the traveling speed are set. The second control position (power position) P2 is a semi-automatic mode in which the engine speed and throttle opening can be arbitrarily set, but the traveling speed is automatically set. The third control position (auto position) P3 as an automatic position is a position where the engine speed, throttle opening and travel speed are automatically set. is there.

The first control position P1 is a switch position for causing the control unit 61 to perform control in the “first control mode”. The second control position P2 is a switch position for causing the control unit 61 to perform control in the “second control mode”.
The third control position P3 is a switch position for causing the control unit 61 to perform control in the “third control mode”.

The throttle lever 52 is an operation member for controlling the opening and closing of the throttle valve 71 by controlling a control motor 72 of an electronic governor (also referred to as an electric governor).
The throttle lever 52 is reciprocated in the front-rear direction as indicated by arrows De and In by the operator's hand, thereby generating a voltage corresponding to the position by the potentiometer 52a.
When the throttle lever 52 is tilted in the direction of the arrow De, the throttle valve 71 (see FIG. 2) is closed until it is fully closed, and when the throttle lever 52 is tilted in the direction of the arrow In, the throttle valve 71 is fully opened. Thereby, the rotation speed of the engine 14 is adjusted.

The direction speed lever 53 is an operation member for controlling the rotation of the electric motors 21L and 21R (see FIG. 2).
An example in which the electric motors 21L and 21R are controlled by the directional speed lever 53 will be described in detail with reference to FIG.

The reset switch 54 is a switch for returning the posture (position) of the auger housing 25 to a preset origin (hereinafter referred to as “reference position”).
As an example, the reset switch 54 is a push button type on / off switch and has a built-in indicator lamp (display unit) 57.

The auger housing posture operation lever 55 is an operation member for changing the posture of the auger housing 25.
That is, the auger housing posture operation lever 55 is a member for operating the elevating drive mechanism 16 and the rolling drive mechanism 38 so that the auger housing 25 is moved up and down and tilted in accordance with the snow surface when the auger 27 performs snow removal work.
By swinging the auger housing posture operation lever 55 to the front side Frs, the rear side Rrs, the left side Les, and the right side Ris, the switches provided at the respective positions are turned on.

  The shooter operating lever 56 is an operating member for changing the direction of the shooter 29 (see FIG. 1).

FIG. 5 is an operation explanatory view of the directional speed lever employed in the snowplow according to the present invention.
The direction speed lever 53 (also referred to as “forward / reverse speed adjustment lever 53”) can be reciprocated back and forth by the operator's hand as indicated by arrows Ad and Ba.
That is, the directional speed lever 53 tilts from the “neutral range” (neutral position) to the “forward” (forward position) side to advance the snowplow 10 (see FIG. 1), and moves forward at low speed in the “forward” region (Lf ) To high speed advance (Hf), the forward speed is controlled by sliding.

  In addition, the direction speed lever 53 is tilted from the “neutral range” to the “reverse” (reverse position) side to move the snowplow 10 backward, and in the “reverse” region, between low speed reverse (Lr) and high speed reverse (Hr). The reverse speed is controlled by sliding.

  In this embodiment, as shown in the figure, a potentiometer 53a (see FIG. 2) is used so that the maximum reverse speed is 0 V (volts), the maximum forward speed is 5 V, and the neutral range is 2.3 V to 2.7 V. Generate voltage according to position.

Next, returning to FIG. 2, the control system of the snowplow 10 will be described. The control system of the snowplow 10 is centralized in the control unit 61.
The control unit 61 has a configuration in which a memory 63 is built in, and various information stored in the memory 63 is appropriately read and controlled.

First, the operation of the system of the snow removal working unit 13 will be described.
The intake system of the engine 14 has a configuration in which the throttle valve 71 is controlled to open and close by the control motor 72 and the choke valve 73 is controlled to open and close by the control motor 74. That is, the control motor 72 of the electronic governor 65 automatically adjusts the opening degree of the throttle valve 71 based on the signal from the control unit 61, and the control motor 74 of the electronic governor 65 adjusts the opening degree of the choke valve 73. It is a configuration that automatically adjusts.

The opening of the throttle valve 71 is detected by a throttle position sensor 75, and the opening of the choke valve 73 is detected by a choke position sensor 76. Each detected signal is transmitted to the control unit 61.
The rotation speed (rotation speed) of the engine 14 is detected by the engine rotation sensor 77 and the detection signal is transmitted to the control unit 61.

The generator 81 is driven with a part of the output of the engine 14 and the generator 81 generates electric power. The generated electric power is supplied to the battery 62 and is also supplied to the left and right electric motors 21L, 21R and other electrical components.
Of the output of the engine 14, the remaining output is used for the rotation of the auger 27 and the blower 28.

While grasping the travel preparation lever 42 and operating the auger switch 45, the electromagnetic clutch 31 is connected (turned on). By connecting the electromagnetic clutch 31, the auger 27 and the blower 28 can be rotated by the power of the engine 14.
Note that the electromagnetic clutch 31 is turned off by turning the travel preparation lever 42 free or operating the auger switch 45.

Next, the operation of the traveling units 11L and 11R will be described.
The snow remover 10 of the present invention includes left and right electromagnetic brakes 82L and 82R as brakes corresponding to parking brakes for ordinary vehicles.
Specifically, the left and right electric motors 21L and 21R are braked by the left and right electromagnetic brakes 82L and 82R. These electromagnetic brakes 82L and 82R are in a brake state (on state) under the control of the control unit 61 during parking.

  The electromagnetic brakes 82L and 82R satisfy the two conditions that the main switch 44 is in the ON position and the travel preparation lever 42 is gripped, and the directional speed lever 53 is switched to forward or reverse. The brake is released (off state).

Position information of the directional speed lever 53 is transmitted from the potentiometer 53a to the control unit 61. The control unit 61 that has obtained the position information rotates the left and right electric motors 21L and 21R via the left and right motor drivers 84L and 84R.
The motor rotation sensors 83L and 83R detect the rotation speeds (rotations) of the electric motors 21L and 21R. Based on these detection signals, the control unit 61 performs feedback control so that the rotation speed becomes a predetermined value.
As a result, the left and right drive wheels 21L, 21R rotate in a desired direction at a predetermined speed and enter a traveling state.

Next, braking during traveling will be described.
Motor drivers 84L and 84R include regenerative brake circuits 85L and 85R and short-circuit brake circuits 86L and 86R. The short circuit brake circuits 86L and 86R are brake means.

While gripping the left turning operation lever 43L and turning on the left turning switch 43La, the control unit 61 activates the left regenerative brake circuit 85L based on the switch-on switch signal, and the left electric switch Reduce the speed of the motor 21L.
While gripping the right turning operation lever 43R and turning on the right turning switch 43Ra, the control unit 61 activates the right regenerative brake circuit 85R based on the switch-on switch signal, and the right electric switch Reduce the speed of the motor 21R.
That is, the snowplow 10 is turned left only while the left turning operation lever 43L is held. Further, the snowplow 10 is turned to the right only while holding the right turning operation lever 43R.

  Then, when the travel preparation lever 42 is released, when the main switch 44 is returned to the OFF position, or when the directional speed lever 53 is returned to the neutral position, the travel of the snowplow 10 stops.

By swinging the auger housing attitude operation lever 55 back and forth, the electric motor 16a is rotated forward and backward, and the piston of the elevating drive mechanism 16 is expanded and contracted. Thereby, the snow removal working part 13 raises / lowers.
The elevation position of the auger housing 25 is detected by a height position sensor (height detection unit) 87, and the detection signal is transmitted to the control unit 61.

By swinging the auger housing posture operation lever 55 left and right, the electric motor 38a is rotated forward and backward, and the piston of the rolling drive mechanism 38 is expanded and contracted. As a result, the snow removal working unit 13 tilts in the left-right direction with respect to the body 19.
A tilt position of the auger housing 25 is detected by a rolling position sensor (tilt detection unit) 88 and a detection signal is transmitted to the control unit 61.

Next, the relationship between the snow removal working part 13 and the auger housing attitude operation lever 55 shown in FIG. 2 will be described in detail with reference to FIG.
FIG. 6 is a control system diagram showing the relationship between the snow removal portion and the auger housing attitude control lever of the snow removal machine according to the present invention.
The snowplow 10 is provided with a snow removal working unit 13 at the front of the machine body 19 (see FIG. 2), and the snow removal work unit 13 includes a lifting drive mechanism 16 that moves up and down and tilts the machine body 19 in the left-right direction. A rolling drive mechanism 38 is provided, and posture returning means 90 for returning the posture of the snow removal working unit 13 is provided.

  The posture return means 90 is a means for executing a reference position return mode for returning the snow removal working unit 13 to the reference position and a reference position switching mode for switching the reference position.

In the reference position return mode, the height position and the tilt position that keep the snow removal working unit 13 in the reference posture are stored in advance as a reference position, and this reference position is compared with the current position of the snow removal working unit 13 and compared. This is a mode in which the elevating drive mechanism 16 and the rolling drive mechanism 38 are controlled to return the snow removal working unit 13 to the reference posture based on the result.
The reference position switching mode is a mode for arbitrarily switching a prestored reference position.

  Here, as an example, the reference posture is a position (hereinafter referred to as “reference position”) where snow on the flat surface 110 can be optimally removed with the snow remover 10 mounted on the flat surface 110 shown in FIG. It means the posture in which the snow removal working unit 13 is arranged.

The reference position is determined by a height reference position (original height position) Hi and a tilt reference position (tilt original position) Lo.
The height reference position Hi is a position where the lower end portion of the scraper 35 provided in the auger housing 25 is in contact with the flat surface 110 (see FIG. 1) in a state where the auger housing 25 is horizontally disposed.
Here, the position where the lower end portion of the scraper 35 contacts the flat surface 110 (see FIG. 1) is the same as the position where the lower end portion of the scraper 35 is disposed at the same height as the lower surfaces of the crawler belts 22L and 22R.
The tilt reference position Lo is a position where the scraper 35 provided in the auger housing 25 is disposed in parallel to the flat surface 110, that is, a position where the scraper 35 is disposed horizontally.
Hereinafter, the reference position is indicated by (Hi, Lo).

The reference position (Hi, Lo) can be set by the following two methods.
The first method is to store the reference position (Hi, Lo) in the memory 63 and set the reference position (Hi, Lo) before shipping the snowplow 10.
In the second method, the reference position (Hi, Lo) stored in advance in the memory 63 is set to a new reference position (Hi, Lo) in accordance with the snow removal site.

Next, the posture return means 90 will be described in detail.
The posture return means 90 includes a reset switch (return command operation unit) 54, a height position sensor (height detection unit) 87, a rolling position sensor (tilt detection unit) 88, and a control unit 61.

The reset switch 54 is a manual switch for transmitting a return signal for executing the reference position return mode to the control unit 61 and for executing the reference position switching mode.
As the reset switch 54, for example, a push button switch is used.
The reset switch 54 is turned on when the push button 54a is pushed in, and turned off when the push button 54a is returned to the position before being pushed by the return spring.

The reset switch 54 is provided with an indicator lamp 57.
The indicator lamp 57 is usually built in the push button 54a of the reset switch 54, but in the present embodiment, it is shown adjacent to the reset switch 54 for easy understanding.

The height position sensor 87 is a sensor that detects the height position of the auger housing 25, and a potentiometer is used as an example.
The height position sensor 87 outputs a voltage (height position detection signal) corresponding to the height position of the auger housing 25.

The rolling position sensor 88 is a sensor that detects the tilt position of the auger housing 25 tilted in the left-right direction with respect to the machine body 19, and a potentiometer is used as an example.
The rolling position sensor 88 outputs a voltage (tilting position detection signal) corresponding to the tilting position of the auger housing 25.

The control unit 61 includes a memory 63 that stores in advance the reference position of the snow removal working unit 13.
Information on the height position is transmitted from the height position sensor 87 to the control unit 61, and information on the tilt position is transmitted from the rolling position sensor 88.

When the return signal is transmitted from the reset switch 54, the control unit 61 compares the height position and tilt position at that time with the reference position of the memory 63, and matches the height position and tilt position with the reference position. A control signal is transmitted to an elevating drive mechanism or a rolling drive mechanism.
Furthermore, the control unit 61 executes the reference position switching mode based on the switching operation of the reset switch 54.

The operation box 41 includes an auger housing posture operation unit 100. The auger housing posture operation unit 100 includes an auger housing posture operation lever 55 and four switches 91 to 94 for auger housing posture operation.
The four switches 91 to 94 are provided around the auger housing posture operation lever 55.

Of the four switches 91 to 94, the switch 91 is a lowering switch provided on the front side of the auger housing posture operation lever 55. The switch 92 is a raising switch provided on the rear side of the auger housing posture operation lever 55.
The switch 93 is a left rolling switch provided on the left side of the auger housing posture operation lever 55. The switch 94 is a right rolling switch provided on the right side of the auger housing posture operation lever 55.

When the auger housing posture operation lever 55 is swung to the front side Frs, the lowering switch 91 is turned on. Receiving the ON signal, the control unit 61 turns on the lowering relay 95 to supply electric power to the electric motor 16a so as to perform normal rotation.
Thereby, the raising / lowering drive mechanism 16 lowers the auger housing 25 and the blower case 26 (snow removal working part 13) (displaces in the arrow Dw direction).

When the auger housing posture operation lever 55 is swung to the rear Rrs, the ascent switch 92 is turned on. Receiving the ON signal, the controller 61 turns on the ascending relay 96 to supply electric power to the electric motor 16a and reverse it.
Thereby, the raising / lowering drive mechanism 16 raises (displaces to the arrow Up direction) the auger housing 25 and the blower case 26 (snow removal working part 13).

When the auger housing posture operation lever 55 is swung to the left Les, the left rolling switch 93 is turned on. Receiving the ON signal, the control unit 61 turns on the left rolling relay 97 to supply electric power to the electric motor 38a so as to perform normal rotation.
Thereby, the rolling drive mechanism 38 tilts the auger housing 25 and the blower case 26 (snow removal working part 13) to the left Le.

When the auger housing attitude control lever 55 is swung to the right Ris, the right rolling switch 94 is turned on. Receiving the ON signal, the control unit 61 turns on the right rolling relay 98 to supply electric power to the electric motor 38a and reverse it.
Thereby, the rolling drive mechanism 38 tilts the auger housing 25 and the blower case 26 (snow removal working part 13) to the right Ri.

Next, a control flow when the control unit 61 is a microcomputer will be described with reference to FIGS.
This control flow starts when the main switch 44 is turned on, for example, and ends when the main switch 44 is turned off.
7 and 9 to 10, STxx indicates a step number.

FIG. 7 is a control flowchart (part 1) of the control unit of the snowplow according to the present invention, and shows a main routine of the control flow. FIGS. 8A to 8C are views for explaining the posture of the snow removal working part of the snow removal machine according to the present invention.
ST01: The switch signal of the reset switch 54 is read.
Note that when the operator pushes the push button 54a of the reset switch 54 shown in FIG. 8, the reset switch 54 is turned on.
ST02: It is determined whether or not the reset switch 54 is on. If it is on, the process proceeds to ST03. If it is off, the process returns to ST01.

ST03: The count time Tc of the timer built in the control unit 61 is set to 0.
ST04: Start the timer.
ST05: It is determined whether the count time Tc (elapsed time Tc) has passed a predetermined reference time Ts. If the reference time Ts has elapsed, the process proceeds to ST06, and if not, the process proceeds to ST11.

Considering the operability of the snowplow 10, the reference time Ts is set to a predetermined time.
ST06: The switch signal of the reset switch 54 is read.
ST07: It is determined whether or not the reset switch 54 is off. If it is off, the process proceeds to ST08. If it is on, the process returns to ST05.
ST08: The timer is stopped.

ST09: The timer count time Tc = 0 is set.
ST10: A reference position return mode for returning the snow removal working unit 13 to the reference position (Hi, Lo) is executed. The reference position return mode will be described in detail with reference to FIG.
ST11: A reference position switching mode for arbitrarily switching the reference position (Hi, Lo) is executed. This reference position switching mode will be described in detail with reference to FIG.

As described above, the snowplow 10 shown in FIG. 8A has the current time when the pressing time (that is, the ON operation time) Tc of the reset switch 54 satisfies the condition that the reference time Ts has not elapsed. The position of the auger housing 25 can be returned to the reference position (Hi, Lo).
In addition, the snow removal machine 10 moves the snow removal working unit 13 to a new reference position (Hi, Lo) when the condition that the ON operation is continued until the pushing time (reference time) Ts of the reset switch 54 elapses is satisfied. ) Can be arbitrarily switched.

FIG. 9 is a control flowchart (part 2) of the control unit of the snowplow according to the present invention, and shows a subroutine for executing the reference position return mode of step ST10 shown in FIG.
ST101: The indicator lamp 57 provided in the reset switch 54 is blinked. By blinking the display, the operator recognizes that the snow removal working unit 13 is returning to the reference position (Hi, Lo).
ST102: The reference position (Hi, Lo) of the snow removal working unit 13, that is, the height reference position Hi and the tilt reference position Lo are read from the memory 63.

ST103: The actual height position Hr of the snow removal working unit 13 is obtained.
The height position Hr is obtained based on detection information detected by the height position sensor 87.
ST104: The difference between the height position Hr and the height reference position Hi is obtained, and the height position Hr is compared with the height reference position Hi.

  If it is determined that the height position Hr is lower than the height reference position Hi (Hi> Hr), the process proceeds to ST105. When it is determined that the height position Hr is higher than the height reference position Hi (Hi <Hr), the process proceeds to ST106. If it is determined that the height position Hr matches the height reference position Hi (Hi = Hr), the process proceeds to ST107.

The height position Hr is determined as follows for the sake of convenience in understanding.
That is, the height position Hr is a position indicating the height of the lower end portion of the scraper 35 provided in the auger housing 25 in a state where the auger housing 25 is horizontally disposed as shown in FIG.

ST105: The raising relay 96 is turned on by a signal from the control unit 61. The elevating drive mechanism 16 raises the snow removal working unit 13 as shown by an arrow Up (see FIG. 8A).
ST106: The lowering relay 95 is turned on by a signal from the control unit 61. The snow removal working unit 13 is lowered by the elevating drive mechanism 16 as shown by an arrow Dw (see FIG. 8A).
ST107: The lowering relay 95 and the raising relay 96 are turned off. The raising / lowering of the snow removal work part 13 by the raising / lowering drive mechanism 16 is stopped.

ST108: The actual tilt position Lr of the snow removal working unit 13 is obtained.
The tilt position Lr is obtained based on detection information detected by the rolling position sensor 88.
ST109: The difference between the tilt position Lr and the tilt reference position Lo is obtained, and the tilt position Lr is compared with the tilt reference position Lo.
Here, when the relationship between the tilt position Lr and the tilt reference position Lo is Lr> Lo, the snow removal working unit 13 is tilted downward to the left (see FIG. 8B).
On the other hand, when Lr <Lo, the snow removal working unit 13 is inclined to the lower right (see FIG. 8C).
When the relationship between the tilt position Lr and the tilt reference position Lo is Lr = Lo, the snow removal working unit 13 is in a horizontal state (see FIG. 8A).

If the tilt position Lr is Lr> Lo with respect to the tilt reference position Lo and it is determined that the snow removal working unit 13 is tilted downward to the left as shown in FIG. 8B, the process proceeds to ST110.
If it is determined that the tilt position Lr is Lr <Lo with respect to the tilt reference position Lo and the snow removal working unit 13 is tilted downward to the right as shown in FIG. 8B, the process proceeds to ST111.
If the tilt position Lr is Lr = Lo with respect to the tilt reference position Lo and the snow removal working unit 13 determines that the snow removal working unit 13 is horizontal as shown in FIG. 8A, the process proceeds to ST112.

The tilt position Lr is determined as follows for convenience of understanding.
That is, as shown in FIGS. 8B and 8C, the tilt position Lr is a tilt angle (position) indicating a tilt when the auger housing 25 is tilted left and right about the auger transmission shaft 33. .

ST110: The right rolling relay 98 is turned on by a signal from the control unit 61.
The snow removal working unit 13 is tilted clockwise as indicated by an arrow Ri (see FIG. 8B) by the rolling drive mechanism 38 shown in FIG.
ST111: The left rolling relay 97 is turned on by a signal from the control unit 61.
The snow removal working unit 13 is tilted counterclockwise as indicated by an arrow Le (see FIG. 8C) by the rolling drive mechanism 38 shown in FIG.
ST112: The left / right rolling relays 97 and 98 are turned off. The tilting of the snow removal working unit 13 by the lifting drive mechanism 16 is stopped.

ST113: It is determined whether or not a condition that the height position Hr matches the height reference position Hi (Hi = Hr) and the tilt position Lr matches the tilt reference position Lo (Lr = Lo) is satisfied. .
When the two conditions are satisfied, the process proceeds to ST114, and when not satisfied, the process returns to ST103.
That is, ST103 to ST113 are repeated until the two conditions (Hi = Hr) and (Lr = Lo) are satisfied.

Here, the two conditions of (Hi = Hr) and (Lr = Lo) are satisfied because the lifting / lowering of the snow removal working unit 13 is stopped in ST107 and the tilting of the snow removing working unit 13 is stopped in ST112. Is the time.
As a result, the snow removal working unit 13 is returned to the reference position (Hi, Lo).

ST114: The indicator lamp 57 is switched from blinking to continuous lighting. After switching, the process returns to ST10 in FIG.
The indicator lamp 57 (see FIGS. 6 and 8A) is turned on to allow the operator to recognize that the snow removal working unit 13 has returned to the reference position (Hi, Lo).
Thereby, the operator can easily recognize that the snow removal working unit 13 has returned to the reference position (Hi, Lo), and the operability is further improved.

As described with reference to FIG. 9, in this embodiment, after returning the height position Hr of the snow removal work unit 13 to the height reference position Hi in ST103 to ST107, the process of the snow removal work unit 13 is performed in ST108 to ST112. An example of processing for returning the tilt position Lr to the tilt reference position Lo has been described.
As another processing example, the process of returning the height position Hr of the snow removal work unit 13 to the height reference position Hi and the process of returning the tilt position Lr of the snow removal work unit 13 to the tilt reference position Lo are simultaneously processed (ie, Parallel processing).

As described above, according to the snow removal machine 10, by executing the reference position return mode with the posture return means 90, the lifting drive mechanism 16 and the rolling drive mechanism 38 are controlled to store the snow removal working unit 13 in advance. The reference position (Hi, Lo) is restored.
Therefore, the operator can automatically return to the reference position without operating the snow removal working unit 13. After the snow removal working unit 13 is returned to the reference position (Hi, Lo), the snow removal working unit 13 can be adjusted according to the landform of the snow removal site.
Thereby, the operator can adjust the snow removal operation part 13 easily according to the snow removal site.

In particular, by operating the reset switch 54 of the posture return means 90, the snow removal working unit 13 can be automatically returned to the reference posture.
Thus, the operator can return the snow removal working unit 13 to the reference position (Hi, Lo) with a simple operation by simply operating the reset switch 54.

In the present embodiment, since the reference position (Hi, Lo) is set to a position where snow can be removed, the snow removal working unit 13 can be moved to a position where snow removal work can be performed with a simple operation by simply operating the reset switch 54. Can be arranged.
Thereby, the operativity of the snow removal machine 10 can further be improved.

Here, some snow removal sites include, for example, undulating terrain and areas with a large amount of snow, and the reference position (Hi, Lo) of the snow removal working unit 13 corresponding to the undulating terrain and areas with a large amount of snow. ) May need to be changed.
Therefore, as shown in FIG. 10, the reference position (Hi, Lo) can be arbitrarily switched by executing the reference position switching mode by the posture return means 90.
Hereinafter, steps for executing the reference position switching mode will be described with reference to FIG.

FIG. 10 is a control flowchart (No. 3) of the control unit of the snowplow according to the present invention, and shows a subroutine for executing the reference position switching mode of step ST11 shown in FIG.
ST201: The indicator lamp 57 provided in the reset switch 54 is blinked. By blinking, the operator is made aware that the reference position (Hi, Lo) is being switched.

Note that the blinking cycle is preferably different from the blinking cycle in ST101 shown in FIG.
This is because it is possible to more reliably discriminate whether the reference position return mode is being executed or whether the reference position switching mode is being executed.

ST202: The actual height position Hr of the snow removal working unit 13 is obtained.
The height position Hr is obtained based on detection information detected by the height position sensor 87.
ST203: The actual tilting position Lr of the snow removal working unit 13 is obtained.
The tilt position Lr is obtained based on detection information detected by the rolling position sensor 88.
ST204: The switch signal of the reset switch 54 is read.
ST205: It is determined whether or not the reset switch 54 is on. If it is on, the process proceeds to ST206, and if it is off, the process returns to ST202.

ST206: The height reference position Hi is changed to the height position Hr obtained in ST202. That is, the height position Hr is set as a new height reference position Hi.
ST207: The tilt reference position Lo is changed to the tilt position Lr obtained in ST203. That is, the tilt position Lr is set as a new tilt reference position Lo.

ST208: The new height reference position Hi and the new tilt reference position Lo are written in the memory 63.
Thereby, the height reference position Hi and the tilt reference position Lo, that is, the reference position (Hi, Lo) is switched to the new reference position (Hi, Lo).
ST209: The indicator lamp 57 is turned off. After the light is turned off, the process returns to ST11 in FIG.
Turning off the indicator lamp 57 allows the operator to recognize that the switching of the reference position (Hi, Lo) has been completed.

As described with reference to FIG. 10, the snowplow 10 switches to the reference position switching mode when the reset switch 54 is turned on for a predetermined time.
In this reference position switching mode, the operator swings the auger housing posture operation lever 55 to the front side Frs, the rear side Rrs, the left side Les, and the right side Ris so that the posture of the snow removal working unit 13 is set to a position desired by the worker. change.

After changing the attitude of the snow removal working unit 13 to a desired attitude, the operator switches the operator's favorite attitude to a new reference position (Hi, Lo) by turning on the reset switch 54.
As a result, the reference position (Hi, Lo) of the snow removal working unit 13 can be arbitrarily changed in correspondence with the undulating terrain or the area with a large amount of snow.

In addition, as described with reference to FIG. 9, the reset switch 54 outputs a return signal for executing the reference position return mode. Further, as described with reference to FIG. 10, the reference position switching mode is executed by the switching operation of the reset switch 54.
With a single reset switch 54, an operation for executing both the reference position return mode and the reference position switching mode can be performed, and the operation unit can be consolidated.
In this way, by consolidating the operation units, it is possible to improve handling and to make the operation unit compact.

An example of the operation procedure of the snow removal machine 10 (see FIG. 1) described above will be described.
FIGS. 11A to 11C are first operation explanatory views showing an example of an operation procedure of the snowplow according to the present invention.
In (a), the engine 14 (see FIG. 1) is started by rotating the main switch 44 as shown by the arrow a1 with the right hand 49R.

  In (b), the snow removal mode is set by rotating the knob 51a of the mode changeover switch 51 (hereinafter referred to as “mode setting switch 51”) with the left hand 49L as shown by the arrow a2. Here, the snow removal mode is set to the third control position (auto position) P3 (see FIG. 3).

  In (c), the travel preparation lever 42 is grasped with the left hand 49L, and the directional speed lever 53 is set in the forward movement region (forward position) with the right hand 49R as shown by the arrow a3. In this state, the airframe 19 (see FIG. 1) can be moved forward.

FIGS. 12A to 12C are second operation explanatory views showing an example of the operation procedure of the snowplow according to the present invention.
In (a), the right hand 49R is moved to the right grip 18R as shown by the arrow a4, and the forward running is continued.

  In (b), the auger switch 45 is pushed with the right hand 49R as shown by the arrow a5, the auger 27 (see FIG. 1) is rotated, and the preparation for snow removal is started.

  In (c), for example, when the mode switch 51 is set to the first control position manual (manual position) P1 in FIG. 11B, the directional speed lever 53 is adjusted with the right hand 49R as shown by the arrow a6, It becomes necessary to adjust the traveling speed of the forward movement. In (a) to (c), the left hand 49L indicates that the traveling preparation lever 42 is still held.

FIGS. 13A to 13C are third action explanatory views showing an example of the operation procedure of the snowplow according to the present invention.
In (a), the height of the auger 27 (see FIG. 2) and the left / right inclination of the auger 27 are adjusted by operating the auger housing posture operation lever 55 with the right hand 49R to the right / left / back / right / left direction of the arrow a7. Proceed with snow removal work.

  In (b), when it becomes necessary to return the height of the auger 27 (see FIG. 2) and the left / right inclination of the auger 27 to the initial position (original position), for example, the reset switch 54 is moved to the arrow with the thumb of the right hand 49R. By pushing like a8, the auger 27 can be returned to the initial position.

  In (c), the shooter operating lever 56 is operated back and forth and left and right as indicated by the arrow a9, and the snow throwing direction (vertical angle and left and right angle) of the shooter is adjusted to change the snow throwing direction of the removed snow. Can do. In (a) to (c), the left hand 49L indicates that the traveling preparation lever 42 is still held.

  That is, the snowplow 10 shown in FIG. 1 is provided with a snow removal part (snow removal work part) 13 at the front of the machine body 19 and an operation part 40 at the rear part of the machine body 19, and the snow removal work part 13 (hereinafter referred to as the operation part 40). In the snow remover provided with a snow removing portion attitude operating member (auger housing attitude operating lever) 55 for operating the vertical movement and left / right tilting of the snow removing portion 13, a snow removing portion attitude operating member is provided on one side of the operating portion 40. It can be said that a return member (reset switch) 54 for returning the snow removal section 13 to the initial position is disposed in the vicinity of the snow removal section posture operation member 55.

By providing the return member (reset switch) 54 for returning the snow removal unit 13 to the initial position, the operation of returning the snow removal unit to the initial position can be performed quickly. As a result, the work efficiency of snow removal can be improved.
In addition, a snow removal unit posture operation member 55 is disposed on one side of the operation unit 40, and a return member (reset switch) 54 for returning the snow removal unit 13 to the initial position is disposed in the vicinity of the snow removal unit posture operation member 55. As a result, the operation of the snow removal unit 13 is concentrated on a specific part of the operation unit 40. As a result, the operation of the snow removal unit 13 can be performed simply, and the burden of snow removal work can be reduced.

In the snowplow (see FIG. 1), a return operation member (reset switch) 54 is arranged on the left rear side of the snow removal portion posture operation member (auger housing posture operation lever) 55.
For example, when it is assumed that the return operation member is placed to the right of the snow removal part posture operation member, and an operation member such as a joystick is used for this snow removal part posture operation member, the joystick is operated with the right hand. There is a risk of hitting the return operating member.

  Therefore, the return operation member (reset switch) 54 is disposed on the left rear side of the snow removal portion posture operation member (auger housing posture operation lever) 55, thereby touching the return operation member during operation of the snow removal portion posture operation member. Can be avoided. As a result, it is possible to prevent erroneous operation of the return operation member.

In the operation unit 40, a push button switch is used as the return operation member (reset switch) 54.
That is, by using a push button switch for the return operation member (reset switch) 54, for example, the push button switch can be operated continuously with the operation of the snow removal portion posture operation member (auger housing posture operation lever) 55. it can. As a result, the operability of the return operation member 54 can be improved.

The operation unit 40 includes a return operation member (reset switch) 54 and an indicator lamp 57, and can be said to employ a switch with illumination.
By using a switch with illumination for the return operation member (reset switch) 54, for example, it can be turned on during the return operation of the snow removal unit 13 (see FIG. 1) to notify the operator. In general, since it takes a predetermined time for the snow removal unit 13 to return, it is possible to improve the convenience of the snow removal machine 10 by notifying the operator that the snow removal unit 13 is performing a return operation. .

FIGS. 14A to 14C are fourth operation explanatory views showing an example of the operation procedure of the snowplow according to the present invention.
11A, when the third control position (auto position) P3 (see FIG. 3) is selected with the mode switch 51 in FIG. 11B, it is not necessary to operate the throttle lever (adjusting member) 52. When the first control position manual (manual position) P1 is selected, the right hand 49R operates the throttle lever 52 as indicated by arrow a10 to adjust the rotational speed of the engine 14 (see FIG. 1) and proceed with the snow removal work. . Further, when the second control position (power position) P2 is selected, the snow throwing distance of snow to be snowed from the shooter 29 (see FIG. 1) can be adjusted.

  In (b), the vehicle body 19 (see FIG. 1) can be moved backward by moving the directional speed lever 53 to the reverse area (reverse position) with the right hand 49R as indicated by the arrow a8.

  In (c), by moving the directional speed lever 53 to the forward region (forward position) with the right hand 49R as shown by the arrow a12, the machine body 19 (see FIG. 1) can be advanced, and the snow removal operation can be continued. . In (a) to (c), the left hand 49L indicates that the traveling preparation lever 42 is still held.

  From FIG. 11 to FIG. 14, it can be said that the mode setting switch 51 is a switch that can be operated at the start of the snow removal work, and the traveling preparation lever 42 is a lever that is always held during the snow removal work.

FIG. 15 is a perspective view of the operation unit of another embodiment of the snowplow according to the present invention. The same parts as those used in the operation unit 40 are denoted by the same reference numerals, and detailed description thereof is omitted.
In the figure, 17L and 17R are operation handles, 18L and 18R are grips, 42 is a travel preparation lever, 43L and 43R are turning operation levers, 44 is a main switch, 45 is an auger switch, 51 is a mode switch, 51a is a knob, 52 is a throttle lever (adjustment member), 53 is a directional speed lever, 55 is an auger housing posture operation lever, 56 is a shooter operation lever, and the operation unit 140 forms a recess 146 in the upper surface 158 of the operation box 141. A reset switch 154 is arranged at 146 and the surface of the reset switch 154 is set at the same level as the upper surface 158 of the operation box 141. Reference numeral 157 denotes an indicator lamp of the reset switch 154.

That is, the operation unit 140 is configured by setting the return operation member (reset switch) 154 to the upper surface 158 and the surface position of the operation unit 140 (operation box 141).
The operation unit 140 sets the return operation member (reset switch) 154 to the upper surface 158 and the surface position of the operation unit 140 (operation box 141), so that the return operation member is operated during the operation of the snow removal unit posture operation member 154. Incorrect operation of 154 can be prevented. As a result, the reliability of the operation of the return operation member 154 can be improved.

  In the snow remover according to the present invention, the surface 158 of the reset switch 154 is set at the same level as the upper surface 141b of the operation box 141 as shown in FIG. 15, but the present invention is not limited to this. It may be lower than the upper surface of the operation box.

  As shown in FIG. 1, the snow removal machine according to the present invention is a snow removal machine for snow removal work. However, the present invention is not limited to this, and the snow removal machine may be another work machine. May be used for other working machines.

  The snow removal machine according to the present invention is suitable for use in an auger type snow removal machine that collects snow with a front auger and removes snow while traveling forward.

1 is a side view of a snowplow according to the present invention. It is a typical top view and control system diagram of the snowplow according to the present invention. It is a perspective view of the operation part of the snow remover which concerns on this invention. It is a top view of the operation part of the snow remover which concerns on this invention. It is action | operation explanatory drawing of the direction speed lever employ | adopted as the snowplow based on this invention. It is a control system figure showing the relation of the snow removal part of the snow removal machine concerning the present invention, and the auger housing attitude control lever. It is a control flowchart (the 1) of the control part of the snow remover which concerns on this invention. It is a figure explaining the attitude | position of the snow removal working part of the snow remover which concerns on this invention. It is a control flowchart (the 2) of the control part of the snow remover which concerns on this invention. It is a control flowchart (the 3) of the control part of the snow remover which concerns on this invention. It is the 1st operation explanatory view showing an example of the operation procedure of the snowplow according to the present invention. It is 2nd effect | action explanatory drawing which shows an example of the operation procedure of the snow remover which concerns on this invention. It is 3rd effect | action explanatory drawing which shows an example of the operation procedure of the snow remover which concerns on this invention. It is a 4th operation explanatory view showing an example of the operation procedure of the snowplow according to the present invention. It is a perspective view of the operation part of another embodiment of the snowplow according to the present invention. It is a figure explaining the conventional basic composition.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Snow remover, 13 ... Snow removal part (snow removal working part), 19 ... Airframe, 40 ... Operation part, 54 ... Return member (reset switch), 55 ... Snow removal part attitude | position operation member (auger housing attitude | position operation lever), 140 ... operation unit 141 ... operation box, 158 ... upper surface.

Claims (2)

In the snow removal machine provided with a snow removal part at the front of the machine body and an operation part at the rear part of the machine body, and provided with a snow removal part posture operation member for operating the snow removal part up and down and left and right tilting on this operation part,
The snow removal machine characterized in that the snow removal part posture operation member is arranged on one side of the operation part, and a return member for returning the snow removal part to the initial position is arranged in the vicinity of the snow removal part posture operation member. . The snow removal machine according to claim 1, wherein the return operation member is arranged on the left rear side of the snow removal portion posture operation member.

Images