JPS6130085B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a snow remover, and particularly to one equipped with a hydraulic drive device that supports a snow remover in a movable and rolling manner with respect to a traveling part of the machine body. This invention relates to a snow blower that is improved so that its parts can be raised and lowered in response to external forces and maintained in a floating state where they can be rolled.

[Prior art]

As a small snow blower, it is equipped with a hydraulic drive device that supports the snow removal section, which is equipped with an auger, scraper, etc., on the traveling section of the machine so that it can move up and down and roll.The snow removal section can be moved up and down or rolled by operating the hydraulic control lever. There are known devices that can be held in any desired position.

[Problem that the invention seeks to solve]

In this type of snow blower, the snow removal section is held at an arbitrary height position or horizontally tilted position, so it is convenient to adjust the snow removal depth according to the slope of the road surface and the snow cover. However, there was a drawback in that the snow removal unit could not be maintained in a floating state where it could be freely raised, lowered, or rolled in response to external forces. As a result, in order to completely remove snow from the road surface by making the scraper of the snow removal section follow the road surface, the hydraulic control lever must be finely adjusted according to the undulations and left/right slope of the road surface. The operation is very complicated and difficult, and especially when performing the above work on paved roads, the auger or scraper of the snow removal section often damages the paved surface due to incorrect fine adjustment of the hydraulic control lever. Katta.

[Means for solving problems]

The present invention has been made to solve the above-mentioned disadvantages, and by keeping the snow removal section in a floating state, the present invention eliminates the need for fine adjustment of the hydraulic control lever when removing snow by making the scraper of the snow removal section follow the road surface. The purpose is to provide an opportunity.

For this purpose, the present invention provides a snow blower comprising a hydraulic drive device that supports a snow removal section in a movable and rollable manner relative to a running section of the machine body.
The snow removal section is composed of a scraper, an auger, a snow throwing chute, etc., and the snow removal section is driven by a drive section whose base end is pivotably supported on the frame of the traveling section so as to be vertically movable, and which has a hydraulic cylinder for lifting/lowering. An engine is mounted on the frame of the drive section behind the snow removal section to transmit power to the snow removal section, and the frame of the snow removal section and the drive section A lifting switching valve and a rolling switching valve are provided with a rolling hydraulic cylinder between them, and switch the oil passages to the lifting hydraulic cylinder and rolling hydraulic cylinder, respectively.
Each of the switching valves is configured to have a float position, and a single operating lever is provided that connects the switching valves with a ring to perform switching operations, and at one operating position of this operating lever, both switching valves are switched to the float position. This is characterized in that the snow removal section is held in a floating state when the snow removal section is operated.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be specifically described below based on an embodiment shown in the drawings.

The snow blower designated by the reference numeral 1 in FIG. By being pivotally attached to the rear end of the traveling frame 6 of the traveling section 2, the driving section 3 is connected to the traveling section 2 so as to be able to move up and down vertically.
The snow removal section 4 is pivotally attached to the frame 5 via a connection mechanism to be described later so as to be able to freely roll left and right.

The drive section 3 has an engine 7 mounted on its frame 5, and a belt transmission mechanism 10 to transmit the rotation of an output shaft 8 taken out from the front part of the drive section 3 to a bevel gear box 9 disposed at the rear of the engine 7. , a universal joint 11, and the like. In order to input the output from the bevel gearbox 9 to which power is transmitted in this manner, a transmission device 12 is disposed at the rear end of the traveling section 2, and a belt transmission mechanism 14 having a tension clutch 13 is disposed between them. is configured. The output shaft of this transmission device 12 has left and right crawler drive sprockets 18.
is attached to the running frame 6, and a rolling wheel 19 is pivotally connected to the front end of the running frame 6, and an idler wheel 20 is pivotally connected to the rear of this. A crawler 21 is wound around the crawler 21, and the traveling section 2 is configured to be able to crawl forward, backward, turn left and right, etc. by operating various operating levers arranged on the upper part of the transmission device 12.

Next, the snow removal section 4 includes a snow throwing chute 23 connected to the upper part of a horizontally cylindrical blower case 22 whose rear end is sealed, and the blower case 2
A scraper 24 having an opening communicating into the blower case 22 is integrally attached to the front end of the blower case 22, and the scraper 24 is curved toward the front in the vertical direction and is slightly wider than the width of the machine body. It has side walls 25 extending forward at both ends thereof, and two upper and lower augers 26, 27 are rotatably supported between the side walls 25, 25. A drive shaft 28 passing through the blower case 22 and scraper 24 is provided with its rear end supported by a bearing on the frame 5 of the drive unit 3, and this drive shaft 28 is connected to a pulley attached to the rear end. 29 is connected to the output shaft 8 of the engine 7 by a belt, and its front end is connected to the auger 27.
The scraper 24 is connected to a bevel gear box 30 that is integrated with the scraper 24 to connect with the drive shaft of the scraper 24. and,
The drive shaft 28 has a blower blade 31 mounted inside the blower case 22, and constitutes a blower device 32 that rotates the blower blade 31 when the engine 7 is operated, and is configured to rotationally drive the augers 26 and 27. There is. Note that power is transmitted to the upper auger 26 from the drive shaft of the lower auger 27 by chain transmission.

The snow removal section 4 having such a configuration is
The support arm 33 attached to the rear end of the blower case 22 is pivotally attached to the frame 5 of the drive unit 3 so that it can rotate left and right, that is, roll freely, with respect to the drive unit 3. There is.

Here, the traveling frame 6 of the traveling section 2 and the drive section 3
A lifting hydraulic cylinder 34 is provided between the frame 5 and the frame 5.
is interposed so that the drive unit 3 can be raised and lowered by expanding and contracting, and the frame 5 and the blower case 22
A rolling hydraulic cylinder 35 is interposed between the snow removal part 4 and the driving part 3, and is configured to roll the snow removing part 4 with respect to the drive part 3 by expanding and contracting the cylinder.

FIG. 3 is a schematic circuit diagram of a hydraulic drive device for the lifting hydraulic cylinder 34, in which the lifting hydraulic cylinder 34, which is a double-acting cylinder, has a lifting switching valve 36.
It is connected to a hydraulic pump 37 and a tank 38 via. Note that a hydraulic pump 37 and a tank 38 are communicated with each other via a relief valve 39 at a stage upstream of the elevation switching valve 36 to keep the pressure of the hydraulic oil constant. Next, the lifting switching valve 36 is a 4-position switching valve with a float position, and it springs back to the stop position shown by the symbol S in the figure, and by operating the lever on the spool, it can be moved to an extended position A, a retracted position B, and a float position. It is configured to be switched to each position of position C and to be locked at float position C. In addition, the rolling hydraulic cylinder 3
The hydraulic drive device No. 5 has the same configuration as described above, and the rolling hydraulic cylinder 35 corresponding to the lifting hydraulic cylinder 34 and the rolling switching valve 40 corresponding to the lifting switching valve 36 also have the same configuration.
Descriptions of these will be omitted.

The lifting switching valve 36 and the rolling switching valve 40 having such a configuration are installed at appropriate locations on the upper part of the mission device 12, and on the other hand, a single operating lever 41 connected to these switches controls the mission device 12. The front and back of the operation panel section 42 that covers
It is supported so as to be tiltable left and right, and its grip 43 protrudes above the panel surface 44. In the middle of this operating lever 41, as shown in FIG. 4, the base ends of an elevating/lowering operating rod 45 extending forward and a connecting rod 46 extending rightward are rotatably attached. The tip is connected to the lifting operation rod 4 via a bell crank 47.
5 is connected to the proximal end of a rolling operating rod 48 parallel to 5. These lift operation rods 45, link rods 46, bell cranks 47, and rolling operation rods 48 are arranged on substantially the same plane, and when the operation lever 41 is tilted back and forth, the lift operation rods 45 move back and forth in the same direction. When tilting, the rolling operating rod 48 is moved forward, and when tilting to the right, it is moved backward. on the other hand,
Lifting switching valve 36 and rolling switching valve 40
is a spool operating lever 4 consisting of a bell crank.
9 and 50 respectively, with these facing upwards,
The tip of the spool operating lever 49 is attached so that it can swing freely in the front and rear directions, and the front end of the lifting operation rod 45 is attached to the tip of the spool operating lever 49, and the rolling operation rod is attached to the tip of the spool operating lever 50. The front ends of the rods 48 are each pivotally connected. The lift switching valve 36 can be switched in two stages from the stop position S in FIG. 3 to the retract position B and the float position C by pushing the tip of the spool operating lever 49 forward.
On the other hand, by pulling backward, you can move to extended position A.
The rolling switching valve 40 is configured in exactly the same manner.

FIG. 5 is a diagram showing the operation pattern of the operating lever 41 formed with a hole in the panel surface 44, in which both the lifting switching valve 36 and the rolling switching valve 40 are in the third position.
Centering on the position N of the operating lever 41 when it is spring-returned to the stop position S shown in the figure, it is formed in a cross shape from there front and back, left and right, and is further formed in a single vertical character at the left end. . The above-mentioned cross-shaped part has a length that allows the operating lever 41 to operate the lifting switching valve 36 and the rolling switching valve 40 one step each from the stop position S, and the extension position of the lifting switching valve 36. The U position corresponds to A, the D position corresponds to retracted position B, the R position corresponds to extended position A, and the L position corresponds to retracted position B of the rolling switching valve 40. is determined. Next, the portion with a single vertical character extends back and forth from the FN position, where the rolling switching valve 40 is switched one step further from the L position to the float position C, and the operating lever 41 switches the lifting switching valve 36 to that position. The length is such that it can be switched two steps forward and one step backward from the stop position S, and FN, FU, FD and FF positions are determined.

In the snow blower 1 configured as described above, the traveling section 2
The snow removal unit 4 is operated while driving the snow removal unit 4 forward, and the snow scraped by the action of the augers 26, 27 and the scraper 24 is thrown to the upper side of the machine via the snow throwing chute 23 by the force feeding action of the blower device 32. When removing snow from the road surface, if you wish to adjust the depth of snow removal according to the slope of the road surface or the amount of snow, move the operating lever 41 to the U position, according to the operating pattern shown in FIG. This is done by changing the position of the snow removal section 4 with respect to the running section 2 by operating the snow removal section 4 to any one of the D position, R extraposition, and L position.
For example, when it is desired to raise the snow removal section 4 by a predetermined amount and control the position so that the left side is lowered, the operating lever 41 is moved to the U position, returned to the N position, and then operated to the L position. When the operating lever 41 is operated to the U position, the connecting rod 46 swings around the connection point with the bell crank 47 and does not move in the axial direction, and only the elevating operating rod 45 moves rearward in the axial direction and the spool operating lever is moved. 49 is pulled backward one step to switch the lifting switching valve 36 to the extended position A, so that the lifting hydraulic cylinder 34 is driven to extend and the drive unit 3 is swung upward with respect to the traveling unit 2. Since the snow removal section 4 is disposed in front of the drive section 3, that is, on the swing end side, it is raised by the extension drive of the lifting hydraulic cylinder 34. Here, when the snow removal section 4 reaches the desired height position and you release your hand from the operating lever 41, the lifting switching valve 36 springs back to the stop position S and holds the operating lever 41 at the N position.
The snow removal section 4 is maintained at a predetermined height. Next, when the operating lever 41 is operated from the N position to the L position, the elevating/lowering operating rod 45 only swings around the connection with the spool operating lever 49, but does not move back and forth in the wheel direction, and the connecting rod 46 The leftward movement in the direction transmits the movement via the bell crank 47 to move the rolling operating rod 48 axially forward. As a result, the rolling switching valve 40
The spool operating lever 50 is pushed forward one step to move the rolling switching valve 40 to retracted position B.
The rolling hydraulic cylinder 35
is contracted and driven to rotate the snow removal section 4 to the left with respect to the drive section 3. If the user releases the operating lever 41 when the snow removal section 4 reaches the predetermined rolling position, the rolling switching valve 40 returns to the stop position S, and the snow removal section 4 is maintained at that position in the same manner as described above. Thereby, the snow removal section 4 is held at a predetermined height position and rolling position with respect to the traveling section 2, and the snow removal depth is adjusted.

Next, when removing snow by making the scraper 24 of the snow removal section 4 follow the road surface, the operation lever 41 is moved to the fifth position.
Operate from the N position to the FF position in the operation pattern shown in the figure. When the operating lever 41 reaches the FN position in the process of this operation, the rolling operating rod 48 is moved forward in the same manner as described above, and at this time, the spool operating lever 50 is pushed two steps forward, so that the rolling switching valve 40 is moved forward. Switch to float position C. Furthermore, when the operating lever 41 is operated from the FN position to the FF position, the linking rod 46 is restricted from moving in the axial direction, only the elevating operating rod 45 moves forward in the axial direction, and the spool operating lever 49
Push forward in two steps to switch the elevation switching valve 36 to float position C. Therefore, both the lifting hydraulic cylinder 34 and the rolling hydraulic cylinder 35 are in a floating state where they can expand and contract freely in response to external forces, and are appropriately contracted by the weight of the snow removal section 4 and drive section 3 to move the snow removal section 4 left and right with respect to the road surface. The scraper 24 is supported by wheels 51, and the lower end of the scraper 24 is brought into contact with the road surface. When the traveling section 2 is moved forward in this state, the left and right wheels 5 may
The reaction force that 1 receives from the road surface is the reaction force that 1 receives from the road surface.
Because it is absorbed as a force that stretches 4,35,
No unreasonable force is applied to the scraper 24, and the lower end of the scraper 24 always follows the road surface to completely scrape up snow on the road surface.

〔Effect of the invention〕

As explained above, according to the present invention, the snow removing section consisting of a scraper, an auger, a snow throwing chute, etc. is supported in a rollable manner at the tip of a frame of a drive section that can be raised and lowered, and an engine is mounted on the frame of the drive section. In addition to the weight of the scraper, auger, and snow throwing chute, the snow removal section also carries the weight of the engine, increasing the snow removal ability of the scraper,
The snow throwing chute allows for efficient snow removal work. Further, since power is transmitted from the engine to the snow removal section along the same frame, the transmission mechanism is simple and the power is transmitted reliably. Furthermore, by simply switching a single operating lever to one operating position, the snow removing section is held in a floating state by applying its own weight and the weight of the engine to the traveling section of the aircraft, and is free to respond to external forces. Since the vehicle can be raised, lowered, and rolled, there is no need to make fine adjustments to the hydraulic control lever when the scraper provided in the snow removal section follows the road surface and completely removes snow. Therefore, the inconvenience of damage to the paved road surface caused by inappropriate fine adjustment of the hydraulic operating lever can also be eliminated. What's more, the scraper can follow the undulations and slopes of the road surface by adding the weight of the engine, so no snow is left behind on the road surface.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a snow blower showing an embodiment of the present invention, FIG. 2 is a schematic plan view showing the connected state of the snow removal section, FIG. 3 is a schematic circuit diagram of the hydraulic drive device, and FIG.
The figure is a schematic perspective view showing a linkage mechanism between the lifting switching valve and the rolling switching valve and these operating levers, and FIG. 5 is a pattern diagram of the operating positions of the operating levers. DESCRIPTION OF SYMBOLS 1... Snow blower, 2... Running part, 3... Drive part, 4... Snow removal part, 5... Frame of drive part, 6... Frame of running part, 7... Engine, 23... Chute for power transmission, 2
4... Scraper, 26, 27... Auger, 34... Hydraulic cylinder for lifting, 35... Hydraulic cylinder for rolling, 36... Switching valve for lifting, 40... Switching valve for rolling, 41... Operating lever, 45, 46, 48...
Rod.

Claims (1)

[Scope of Claims] 1. A snow blower comprising a hydraulic drive device that supports a snow removal section in a movable and rolling manner relative to a traveling section of the machine body, wherein the snow removal section includes a scraper, an auger, and a snow throwing chute. etc., the base end of which is pivotally supported to be vertically movable on the frame of the traveling section, and rollably supported by the distal end of the frame of the drive section having a hydraulic cylinder for lifting; An engine is mounted on the frame of the drive section at the rear of the section to transmit power to the snow blower, and a hydraulic cylinder for rolling is installed between the snow removal section and the frame of the drive section to provide hydraulic pressure for lifting. The lifting switching valve and the rolling switching valve, which switch the oil paths to the cylinder and the rolling hydraulic cylinder, respectively have a float position, and the switching valves are connected by a rod and are operated by a single valve. One operating lever is provided, and this operating lever is configured to switch both of the switching valves to a float position at the operating position, and hold the snow removing section in a floating state where it can be raised and lowered and rolled freely according to external force. A snow blower.