JP7207022B2 - Engine mounting device for slope work machine - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies Kokusai Nogyousha Co., Ltd. Rural News No. 3025 Issued January 14, 2019 Page 11 Kokusai Nogyousha Co., Ltd. Rural News No. 3032 March 4, 2019 Published by Nokei Shinposha Nokei Shinpo No. 3253, page 8, published on January 14, 2019 Nokei Shinpo, No. 3260, page 9, published on March 4, 2019 Shin Co., Ltd. Norinsha Agricultural Machinery Newspaper No. 3699 Issued January 15, 2019 New Norinsha Agricultural Machinery Newspaper No. 3706 Page 16 Issued March 5, 2019 2019 New Year Celebration Market February 18, 2019 Held Product briefing for large-scale farmers Held on February 7, 2019 14th JA Fureai Fair, Tokushima Held on February 23, 2019 Posted on company website Posted on February 28, 2019 https:// atex net. co. jp

To maintain and control the mounting angular posture of an engine mounted on a vehicle body in a stable working posture in a sloped-ground work machine that performs work such as mowing while traveling on a steep slope.

In a lawn mower that runs along a sloped surface such as a river embankment or a road slope and cuts grass while rotating the blades at high speed, the engine for driving these traveling devices and mowing blades. Since the tilt limit angle is 15 to 25 degrees, for example, on a steeply sloping ground, a technique is known for setting the tilt so that the engine is within the use limit angle (Patent Document 1).

In addition, in order to suppress the impact acting on the hoist cylinder of the dump truck and improve the durability and life of the hoist cylinder, a damper is provided between the frame side bracket and the bed side bracket having the long hole on the side of the bed. , a technique of providing a damping force generating mechanism (Patent Document 2).

JP 2017-87783 A JP 2015-113065 A

A lawn mower that cuts grass on a steep slope (the same is true for a lawn mower in the form of radio control) uses a gasoline 4-cycle engine. It is necessary to change the tilting attitude of the engine so that it is within the engine operating limit angle of 15 to 25 degrees. Further, it is preferable that the radio-controlled mower is configured such that the inclination of the vehicle body is detected by the inclination sensor and output to the electric cylinder to automatically control the inclined mounting position of the engine.

However, such an electric cylinder is generally strong in compression but weak in tension. Therefore, there is a risk that the electric cylinder may be damaged depending on the overturning direction of the vehicle body. Difficult to maintain control. In addition, the engine rattles and vibrates easily during mowing, making it difficult to exhibit stable mowing performance.

According to the first aspect of the invention, an engine base 3 mounted on a vehicle body 1 of a working machine, on which an engine 2 is mounted, is configured so that the angle thereof can be changed. An electric cylinder 4 for changing the mounting attitude angle of the electric cylinder 4 is provided, and the space between the vehicle body 1 and the engine base 3 is constantly pressed against the extension operation of the electric cylinder 4, and the expansion and contraction operation of the electric cylinder 4 is loosened. The configuration of the engine mounting device for the slope work machine is characterized by providing a gas damper 5 that prevents the sloping ground.

The angle of the mounting attitude of the engine base 2 with respect to the vehicle body 1 is adjusted by the expansion and contraction operation of the electric cylinder 4, and the angle of the mounting attitude of the engine base 2 with respect to the vehicle body 1 is changed and adjusted to be maintained and controlled at an appropriate mounting attitude angle of the engine 2. - 特許庁Since the pressing force of the gas damper 5 is always acting, the extension operation of the electric cylinder 4 is performed against the constant pressing force state of the gas damper 5, and the electric cylinder 4 is expanded and contracted. 4 is maintained in a state in which loosening does not occur in the expansion and contraction operation of the engine 2, regardless of the tilted attitude of the engine 2, the angle of the mounting attitude is controlled to a predetermined one.

The gas damper 5 is fitted with a free piston 8 movable by the gas pressure in the gas chamber 7 in the damper cylinder 6 to partition the gas chamber 7 and the oil chamber 9 . On the oil chamber 9 side, a piston 12 having a spool valve 11 which is opened and closed by operating a push rod 10 is movably fitted and provided, and the spool valve 11 is opened only while the push rod 10 is being pushed. When the push rod 10 is released, the spool valve 11 is closed to allow oil to move between the oil chambers 9A and 9B to release the locked state of the piston 12. A free-lock configuration is employed in which the operation of the piston 12 is locked by making it impossible for oil to move between the oil chamber 9B, and the gas damper 5 is compressed and contracted to a predetermined length to be locked. After the gas damper 5 is attached between the vehicle body 1 and the engine base 3, the locked state is released by the push operation of the push rod 10, and a constant pressing force is applied to prevent looseness in the telescopic operation of the electric cylinder 4. It is an engine mounting device for a slope work machine.

The electric cylinder 4 is driven by an electric motor to rotate between a threaded cylinder and a screw shaft that are screwed together to extend or contract the electric cylinder 4, thereby moving the vehicle body 1 on which the engine 2 is mounted. , the mounting angle of the engine base 3 is changed and controlled. At this time, of the turning force of the engine base 3 which is expanded and contracted by the expansion and contraction of the electric cylinder 4, the gas damper 5 is arranged so as to resist the expansion action and to pressurize the electric cylinder 4 in the contraction direction for the contraction action. Since the gas pressure of the engine 2 is working, the expansion and contraction of the electric cylinder 4 and the loosening and rattling of the connecting mechanism of the electric cylinder 4 with respect to the vehicle body 1 and the engine base 3 are eliminated. The angle can be operated smoothly and accurately. As a result, breakage, damage, etc. of the electric cylinder 4 can be reduced.

A free piston 8 is slidably fitted in the damper cylinder 6, and the free piston 8 is used between an oil chamber 9 filled with oil and a gas chamber 7 filled with gas for generating gas pressure. , and a piston 12 having a spool valve 11 for opening and closing an orifice hole 13 by means of a push rod 10 is slidably fitted in the oil chamber 9 to form a free-lock configuration. When the push rod 10 is pushed to open the spool valve 11, the oil in the oil chamber 9 flows out and enters between the oil chambers 9A and 9B through the orifice hole 13 of the piston 12, and the lock is released. Then, when the piston 12 becomes movable, or when the push rod 10 is released, the spool valve 11 is closed by the gas pressure in the gas chamber 7, and the flow of oil from the orifice hole 13 is stopped and locked. state. In this manner, the gas damper 5 expands and contracts according to the expansion and contraction of the electric cylinder 4, and regardless of the expansion and contraction of the electric cylinder 4, the gas pressure in the gas chamber 7 of the gas damper 5 causes the free piston movement. 8 is always gas-pressed to the side of the oil chamber 9 to prevent the expansion and contraction of the electric cylinder 4 from rattling and loosening.

When the gas damper 5 is attached and detached between the vehicle body 1 and the engine base 3, the gas damper 5 in the free-lock state is compressed to a predetermined length and locked so that both ends of the gas damper 5 are locked. can be attached to or detached from the vehicle body 1, the engine base 3, or the like, unlocked, and stretched by the gas damper 5 so as to be pushed open so as to be in a fixed state. Using the gas tensioning action of the gas damper 5, the opening and closing operation of the spool valve 11 by the push rod 10, and the like, the electric cylinder 4 and the gas damper 5 can be attached and detached simply and easily.

According to the first aspect of the invention, the electric cylinder 4 used for controlling the mounting posture of the engine 2 of the working machine is extended and contracted by rotation of a screw shaft, a screw cylinder, etc., by an electric motor or the like, and the engine base 3 is mounted on the vehicle body 1. change the mounting angle of the When the ground on which the working machine travels becomes steeply inclined, the electric cylinder 4 is extended and retracted in accordance with the inclination of the vehicle body 1, and under the pressing force of the gas damper 5, the electric cylinder 4 is extended and retracted. As the gas damper 5 is extended and contracted, the tilt angle of the engine base 3 is rotated in a direction to reduce the inclination angle of the engine base 3, thereby balancing the position of the center of gravity of the engine 2 and stabilizing the working posture.

The electric cylinder 4 is generally used because it is easy to control expansion and contraction, is inexpensive, and is compact. However, by providing the gas damper 5, the posture of the engine 2 can be smoothly maintained vertically by the electric cylinder 4, and the work machine can be prevented from overturning even when working on a steep slope. Also (see FIGS. 7 and 8), the pressing force of the gas damper 5 always works in the direction opposite to the extension direction of the electric cylinder 4, that is, in the direction opposite to the direction in which the electric cylinder 4, which is weak in strength, is pulled. The electric cylinder 4 is hard to be damaged, and durability against impact can be increased. In this way, when the electric cylinder 4 is extended, contracted, and stopped, the gas pressure of the gas damper 5 is always applied, so that rattling or the like does not occur.

Further, since the gas damper 5 is added to the electric cylinder 4 for changing and adjusting the mounting attitude of the engine 2 of the working machine, the construction can be simplified, and the safety of the working machine and work can be improved. can enhance sexuality.

Further, when the mounting attitude angle of the engine 2 is greatly inclined during work on a slope, the mounting angle of the engine base 3 is controlled to follow the vertical direction line D by the expansion/contraction control of the electric cylinder 4. can stabilize the mounting posture of the Since the extension of the electric cylinder 4 is performed against the gas pressure of the gas chamber 7 of the gas damper 5, the expansion and contraction of the electric cylinder 4 and the attachment connecting portions of both ends to the engine base 3 are controlled by the generation of the gas chamber 7. The looseness and backlash of these connections and mounting portions are reduced by constantly tensioning them with the gas pressure applied.

The tension force of the gas damper 5 due to the gas pressure is always in a constant direction due to the gas pressure of the gas chamber 7 regardless of whether the electric cylinder 4 is operated in the direction of extension or in the direction of contraction. Therefore, the tension force in the opposite direction can be eliminated, and loosening and looseness in the electric cylinder 4 and the connecting portion of the electric cylinder 4 to the engine base 3 etc. can be reduced, and breakage, damage, etc. can be reduced. .

Further, when the electric cylinder 4 is contracted (reduced), the gas pressure of the gas damper 5 acts in a direction that supports the contraction force of the electric cylinder 4, so that the electric cylinder 4 is contracted . The gas pressure of the gas damper 5 is always acting even when it is operated or contracted and stopped, and the pressurized pressure is always applied without causing looseness (rattling) in the expansion, contraction, stop, and action of the electric cylinder 4. Safety can also be increased against impact in the tensile direction. Therefore, the risk of damage to the electric cylinder 4 can be reduced.

Furthermore, the free-lock type gas damper 5 can be kept in a locked state at any length, and the gas damper 5 can be easily attached and detached. Also, if the electric cylinder 4 is removed from the engine base 3, the mounting posture of the engine 2 can be manually tilted or fixed at an arbitrary angle, and the tilt angle of the engine 2 can be manually adjusted and fixed below the use limit angle. It is easy to do so, and burnout of the engine 2 can also be prevented.

Top view of the lawn mower. Its side view. The top view which shows an engine base part. The rear view (a) and the rear view (b) showing the rolling state of the engine. FIG. 4 is a side cross-sectional view showing an operating state of the gas damper portion; A sectional side view of an electric cylinder. FIG. 2 is a rear view showing the overturned state of the mower. Enlarged rear view of part thereof. Enlarged rear views (a) and (b) showing the attached state of the gas damper. The rear view showing the rolling state of the engine on the sloping ground. A top view of a wireless transmitter.

Based on the drawings, the radio-controlled mower has a 4-cycle engine 2 mounted on the upper side of a vehicle body 1 having a pair of left and right crawlers 14, and electricity generated by a generator 20 driven by the engine 2. A charger for charging, a lithium-ion battery 16, etc. are placed and mounted, and a motor 17 driven by the power from the lithium-ion battery 16 is mounted at the rear end of the vehicle body 1 via a transmission mechanism in a transmission case 18. , the drive sprocket 19 of the crawler 14 is rotated to allow the crawler 14 to travel. 21 is a fuel tank.

On the vehicle body 1, an engine base 3, on which an engine 2, a power generator 20, a fuel tank 21, etc. are mounted, is placed around a rolling axis 22 along a center line L located at the center of the width of the vehicle. It is rotatably supported. A cover 52 and a guard frame 23 are provided on the upper portion of the vehicle body 1 to cover the upper portions of the engine 2 on the engine base 3, the power generator 20, the fuel tank 21, and the like. A mower deck 24 is suspended from the bottom of the vehicle body 1 via a front and rear four-point parallel link mechanism 25 so as to be vertically adjustable.

A blade 51 that rotates C via a vertical blade shaft is arranged on the mower deck 24, and the rotation C of the blade 51 cuts the lawn grass guided from the front end mouth of the mower deck 24. It can be diffused and discharged on the surface. The blade shaft of the mower deck 24 is driven by a transmission mechanism or the like driven by the engine 2 to perform the mowing operation.

A control box 26 is provided on the transmission case 18 at the rear end of the vehicle body 1 to receive an operation signal from a wireless transmitter 60 and transmit the operation signal to the drive sprockets 19 of the left and right crawlers 14 . The radio transmitter 60 is provided with a forward/reverse lever 27A, a steering lever 27B, an antenna 28 for transmitting/receiving signals to/from the receiver of the control box 26, and a display 29 for displaying various operation data. Further, a power switch 30, a travel speed adjustment volume 31S, a cutting height adjustment volume 31T, an engine start switch 32S, an engine stop switch 32T, a cutting blade clutch ON/OFF switch 33, an engine tilt automatic manual switch 34, and the like are arranged.

The lawn mower cuts lawn grass by rotating C of the blade 51 of the mower deck 24 at the bottom while the crawler 14 travels on the sloped ground B in the direction along the contour line. For this reason, the engine 2 mounted on the vehicle body 1 stands vertically with respect to the inclined ground B in a work machine without a mechanism for tilting the engine 2. The electric cylinder 4 for tilting toward the upper side inclined surface of B (tilting so as to be in a vertical posture) is attached and fixed to the rear end of the engine base 3 at the upper end of the bracket 35 and the bracket 36 on the right side of the vehicle body 1. The hole 37a at the base end of the electric cylinder 4 is pivotally attached to the bracket 36 on the vehicle body 1 side with a bolt 37, and the hole 38a at the tip of the cylinder rod 53 is pivotally connected with a bolt 38. Then, by rotating the electric motor 80 of the electric cylinder 4, the cylinder rod 53 of the electric cylinder 4 is expanded and contracted by screwing, and the space between the bolts 37 and 38 is expanded and contracted, so that the mounting posture of the engine 2 is changed. can be controlled.

In this electric cylinder 4, the screw shaft 71 in the cylinder rod 53 is rotated via the gear reduction portion 70 by driving the electric motor 80, and the cylinder rod 53 and the cylinder rod 53 screwed together with the screw shaft 71 are integrated. When the ball screw nut 73 is extended and moved in, the threaded portion between the screw shaft 71 and the ball screw nut 73, the connection portions of the electric cylinder 4 with the vehicle body 1 and the engine base 3, and the like are loosened. Also, even in a state where rattling or the like is likely to occur, the gas damper 5 always acts to apply a pressing force in the direction of pushing the electric cylinder 4, so the occurrence of such rattling can be suppressed to a minimum. . Also, rattling of the engine 2 and the like during running can be reduced.

In the state shown in FIG. 4(b), when the electric cylinder 4 is extended to push the engine base 3 against the vehicle body 1 to the compression side, the gas pressure of the gas damper 5 exerts strong and stable pressure control. can be done. Further, when the electric cylinder 4 is contracted and the tilt angles of the engine base 3 and the engine 2 are controlled to tilt toward the electric cylinder 4 side, the pressing force due to the gas pressure of the gas damper 5 acts. Therefore, when the electric cylinder 4 is extended and retracted, when switching between the extension and retraction operations, and when the connecting portion between the electric cylinder 4 and the vehicle body 1 or the engine base 3 is pulled together, these mechanical parts are affected. The pulling action is acted upon by a pressing force in the same direction by the gas damper 5, which makes it difficult for sudden loosening or rattling to occur in the connecting portion, thereby reducing breakage and damage, and enhancing durability and safety. can.

The gas damper 5 is rotatable between the bracket 35 and the bracket 39 on the left side of the vehicle body 1 , and expands and contracts according to the space between the bolts 40 and 41 . It is configured such that a pressing force is applied at all times. The gas damper 5 has a gas chamber 7 filled with, for example, nitrogen gas. and a piston rod 42 which is fitted and inserted through a hole 41a of a bracket 54 at the tip thereof and pivotally connected to the bracket 35 on the side of the engine base 3 with a bolt 41. The pressure always presses the piston rod 42 on the tip end side so as to push it out.

The damper cylinder 6 of the gas damper 5 is fitted with a free piston 8 movable by the pressure of the gas in the gas chamber 7 to partition the gas chamber 7 and the oil chamber 9 . A piston 12 having a spool valve 11 that is opened and closed by operating a push rod 10 is movably fitted to the chamber 9 side, and the spool valve 11 is opened only while the push rod 10 is being pushed. When the push rod 10 is released, the spool valve 11 is closed and the piston 12 is operated. The gas damper 5 is configured to be in a free-locking form in which the is locked, and the gas damper 5 configured to be constantly pressed against the expansion and contraction operation of the electric cylinder 4 so as not to cause loosening in the expansion and contraction operation is extended by a predetermined length. The engine mounting device is structured such that the push rod 10 is pushed to release the locked state after the mounting and the push rod 10 is pushed, and the pressing force is always applied to the expansion and contraction operation of the electric cylinder 4.例文帳に追加

The push rod 10 is fitted through the inside of the piston rod 42 and is brought into contact with the upper end surface of the sliding portion 43 of the lower end spool valve 11 so that the upper end protrudes from the upper end of the piston rod 42 . ing. By pushing the upper end of the push rod 10, the spool valve 11 is pushed down, and the orifice hole 13 can be communicated between the upper and lower oil chambers 9A and 9B. , the oil in the upper oil chamber 9A can be released into the lower oil chamber 9B when the piston rod 42 extends. Therefore, when the push rod 10 is pushed in, the spool valve 11 is opened, allowing the oil between the oil chambers 9A and 9B to move through the orifice hole 13, allowing the piston 12 and the piston rod 42 to move. and unlocked . When the pushing operation of the push rod 10 is released, the spool valve 11 is closed by the gas pressure in the gas chamber 7, and the oil cannot flow between the upper and lower oil chambers 9A and 9B. locked.

The piston rod 42 is unlocked only while the push rod 10 is being pushed in, and can be locked when the pushing of the push rod 10 is released. can be adjusted to Therefore, when the inclination angle of the engine base 3 is changed around the rolling axis 22, the expansion and contraction action of the gas damper 5 allows the electric cylinder 4 to smoothly and accurately control the angle of correction of the inclination posture of the engine base 3. can be done.

A mounting washer 44 bent stepwise is provided at the tip of the piston 42, and a hook plate 46 bent in an L shape and having a hook hole 45 formed at the tip thereof is provided on the tip surface side of the mounting washer 44. are superimposed, detachable, and can be integrally attached and fixed by bolts 47 and nuts 48 . Further, an opening/closing arm 50 is provided on the tip side of the mounting washer 44 and is rotatable to open and close around the hinge 49 on the lower edge side. , the spool valve 11 is opened and unlocked, and the piston rod 42 can be freely extended and retracted. This unlocked state can be maintained by attaching and fixing the hook hole 45 of the hook plate 46 in a state where it is engaged with the tip of the open/close arm 50 . The locked state can be restored by removing the (see FIGS. 5 and 8).

The mounting posture control of the engine 2 by the electric cylinder 4 is performed by, for example, providing a tilt sensor for detecting the lateral tilt angle of the vehicle body 1 and detecting a lateral tilt of the vehicle body 1 at a predetermined angle or more. , by the output from the control box 26, the electric cylinder 4 is telescopically operated, and the engine base 3 supporting the engine 2 is turned around the rolling axis 22 to the side opposite to the inclination of the engine 2 or the vehicle body 1. , the engine 2 can be mounted on the vertical line D by rolling A, and the position of the center of gravity of the vehicle body 1 can be shifted to the upper side of the inclined ground B, and the vehicle body 1. Stabilize work travel, prevent overturning, and prevent breakage and damage to the machine. In addition, even if the rolling A angle of the engine 2 and the engine base 3 can only tilt up to 20 degrees on one side of the left and right sides, if the use tilt angle of the engine 2 is 25 degrees, the tilted ground B can be tilted up to a total of 45 degrees. Therefore, it is not necessary to raise the engine 2 up to an angle along the vertical direction line D, and the mowing work can be performed at an inclination angle of the engine 2 itself or less.

In such engine 2 mounting posture control, the action of the gas damper 5 works, so that the mounting posture of the engine 2 by the electric cylinder 4 is smoothly performed, and the vehicle body 1 can be prevented from overturning. However, if for some reason the vehicle body 1 overturns and falls from the sloping ground B to the horizontal ground E (see FIGS. 7 and 8), the weight load of the engine 2 and the like mounted on the engine base 3 is reduced. is overturned and thrown in the lateral direction F, and the contact impact force W of the crawler 14 that rolls over and touches the horizontal ground E is large. Absorbed and relieved, the electric cylinder 4, which has particularly weak strength in the direction of pulling, and the interlocking and connecting parts of the mowing machine, are less likely to be rattled, misaligned, damaged, etc., and the mounting attitude of the engine 2 is smooth and accurate. can be done.

1 Vehicle Body 2 Engine 3 Engine Base 4 Electric Cylinder 5 Gas Damper 6 Damper Cylinder 7 Gas Chamber 8 Free Piston 9 Oil Chamber 9A Oil Chamber 9B Oil Chamber 10 Push Rod 11 Spool Valve 12 Piston

Claims (1)

An engine base (3) on which an engine (2) is mounted on a vehicle body (1) of the work machine is configured to be angle-changeable, and an engine is electrically extended and contracted between the vehicle body (1) and the engine base (3). An electric cylinder (4) is provided to change the mounting attitude angle of (2), and the vehicle body (1) and the engine base (3) are constantly pressed against the extension operation of the electric cylinder (4), A gas damper (5) is provided which does not cause loosening in the expansion and contraction operation of the electric cylinder (4), and the gas damper (5) is movable by the gas pressure in the gas chamber (7) in the damper cylinder (6). A free piston (8) is fitted to partition the gas chamber (7) and the oil chamber (9), and a push rod (10) is provided on the oil chamber (9) side of the free piston (8). A piston (12) having a spool valve (11) opened and closed by is movably fitted, and the spool valve (11) is opened only while the push rod (10) is being pushed, and the oil chamber When the piston (12) is unlocked by allowing oil to move between (9A) and the oil chamber (9B), and the pushing operation of the push rod (10) is released, the spool valve (11) is opened. The gas damper (5) is closed to prevent the movement of oil between the oil chamber (9A) and the oil chamber (9B), thereby locking the operation of the piston (12) in a free-lock configuration, and the gas damper (5) is compressed. and the gas damper (5) is attached between the vehicle body (1) and the engine base (3), and then the push rod (10) is pushed to lock the gas damper (5). is released to apply a constant pressing force that does not cause slackness in the telescopic operation of the electric cylinder (4) .

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