JP7041846B2 - Mower blade transmission - Google Patents

Description

According to the present invention, when mowing on a sloping ground, an engine that interlocks and drives the blade shaft is tilted and rotated with respect to the body of the mowing machine equipped with a mowing deck that mounts the mowing blade shaft. Then, in a mowing machine that stabilizes the position of the center of gravity of mowing by rotating it to a vertical posture, the drive shaft on the engine side to the blade shaft of the mowing deck regardless of the change in the rotation of the mounting posture of the engine. It relates to a blade transmission device that simplifies the transmission mechanism of the engine to perform accurate and smooth transmission.

Technology that stabilizes the mowing running posture by rotating the posture of the engine mounted on the mowing vehicle body to a vertical posture around the output shaft of the engine according to the inclination of the vehicle body detected by the inclination sensor on the inclined mowing surface. For example, see Patent Document 1). Further, in a V-belt transmission configuration between pulleys, a technique for maintaining a reliable transmission state while twisting the V-belt (for example, Patent Document 2) is known.

Japanese Unexamined Patent Publication No. 2017-78783 Japanese Unexamined Patent Publication No. 2000-136236

In the mower form, the mounting posture of the mounted engine is tilted to the left and right with respect to the mowing vehicle body, and the mounting posture of the engine is tilted and rotated appropriately according to the left and right tilted surfaces of the mowing ground. The weight with respect to the body, the deviation of the position of the center of gravity, the movement are large, and the mowing running tends to be unstable. Further, if the relationship position between the drive shaft on the engine side and the transmission shaft on the mowing deck side changes due to the tilt rotation of the engine, the transmission drive resistance tends to change significantly, or when the mowing height is adjusted, the mowing deck side It is difficult to maintain accurate transmission because the transmission shaft of the engine moves up and down, the shaft spacing changes, and the belt line running between these drive shafts and the transmission shaft shifts up and down or twists. .. In particular, even in a transmission mode in which a belt is hung between the drive shaft on the engine side and the blade shaft on the mowing deck side, the belt line tends to fluctuate, the transmission efficiency tends to decrease, and the mowing work is stabilized. There is also a problem that the belt cannot be easily removed from the pulley.

The invention according to claim 1 has a link front end portion on the vehicle body 5 side with respect to a traveling vehicle body 5 traveling with a pair of left and right crawler 4 on a cutting deck 3 equipped with a blade shaft 2 of a grass cutting blade 1. Around the link axes 6 and 7, the rear end of the link is pivotally supported around the link pins 36 and 37 on the mowing deck 3 side. The engine base 15 is provided on the upper side of the mowing deck 3, and the engine E is mounted on the engine base 15 at the front position of the blade shaft 2 so as to be driven downward toward the lower side of the engine base 15. A two-stage drive pulley 12 is attached to the shaft 11, and an alternator 25 is arranged behind the engine E in the case of traveling drive by an electric motor, and a hydraulic pump is arranged in the case of traveling drive by a hydraulic motor. The V pulley 57 is attached to the rotating shaft 56 protruding downward from the engine base 15, and the counter shaft 14 to which the upper and lower two-stage counter pulley 13 is attached is erected behind the grass cutting deck 3 side of the blade shaft 2. Then, the blade pulley 17 is attached to the blade shaft 2 projecting upward from the mowing deck 3, the V-belt 58 is stretched between the upper V-pulley 55 and the V-pulley 57 of the drive pulley 12, and the lower drive pulley 12b. A drive belt 10 is stretched between the upper counter pulley 13a and a cutting belt 19 having a cutting clutch 20 that can be tensioned and relaxed by the tension pulley 18 between the lower pulley 21 and the blade pulley 17 of the counter pulley 13. The engine base 15 can be tilted to the left and right around the support member 16 provided at the center of the left and right at a position H lower than the engine E mounting surface at the front end and the rear end of the engine base 15. The center line L is a virtual straight line in the front-rear direction extending between the front and rear support members 16 and 16, and the center line L in a substantially horizontal state in side view and the mowing deck 3 are raised to the highest height. The mowing machine is characterized in that it is set so as to be substantially aligned with the drive belt 10 belt line A1 at the time of the operation, and the mowing height can be adjusted by moving the mowing deck 3 up and down with this position as the upper limit. The configuration of the blade transmission device.

The crawler 4 is driven by a motor mounted on the vehicle body 5, and the mower is mowed. By driving the engine E, the drive shaft 11 is rotated, and the blade 1 of the mowing deck 3 is rotated via the drive belt 10, the counter shaft 14, the mowing belt 19, the mowing clutch 20, and the like to perform mowing work. be able to. When the cutting clutch 20 operates at the transmission cut position, the rotation transmission of the cutting belt 19 is stopped, the rotation of the blade 1 is stopped, and the mowing action is stopped.

When simply running the mower, the mowing deck 3 is in a non-mowing position raised to the non-mowing position (see FIGS. 1 and 4), and when performing mowing work, the mowing deck 3 is placed with respect to the vehicle body 5. In this descending mowing posture position, the cutting clutch 20 is operated to the transmission input position from the counter shaft 14, the cutting belt 19, the blade shaft 2, and the blade 1 are lowered (see FIGS. 2, 3, and 4). The mowing work can be performed by the drive rotation of.

When the mowing running ground is greatly inclined to the left or right during such mowing work, the mounting posture of the engine E is changed to the vehicle body 5 by detecting the inclination sensor or the like or by artificial operation or the like. Regardless of the left or right tilt of the mowing machine, the attitude is controlled so as to always maintain a vertical posture or to an angle that does not exceed the usage limit tilt angle of the engine E, and the mowing machine is further tilted and rolled over. Etc., prevent unevenness of the mowing run, and maintain the stability of the mowing run.

When the engine E is tilted to the left or right of the mower to change and control the mounting posture, the engine base 15 mounted on the engine E is placed around the support shaft 16 along the center line L, and the vehicle body 5 The posture is controlled by rotating toward the climbing side of the slope according to the left and right tilt postures.

In such a transmission mode, the cutting clutch 20 that transmits the blade shaft 17 tensions and relaxes the cutting belt 19 between the counter shaft 21 and the blade shaft 17 with the tension pulley 18, and the clutch is engaged and disengaged. Even if the mowing deck 3 moves up and down, or even if the engine E posture is tilted, the belt clutch 20 can engage and disengage the clutch smoothly, accurately, and easily. It can be carried out.

The elevating action of the mowing deck 3 on the vehicle body 5 is mounted via parallel links 8 and 9 in a forward climbing inclined form supported by two pairs of front and rear link shafts 6 and 7 with respect to the vehicle body 5, and the mowing deck 3 is omitted in the front-rear direction. It can move up and down while maintaining a horizontal posture. Further, in the non-cutting position where the mowing deck 3 is raised to the upper limit position, the belt line A1 of the drive belt 10 spanned between the lower drive pulley 12b of the drive shaft 11 and the upper pulley 21 of the counter shaft 14. The center line L, which is a virtual straight line in the front-rear direction extending between the support members 16 and 16 before and after becoming the left-right tilt rotation fulcrum of the engine base 15, is set so as to substantially match the side view.

When such a mowing deck 3 is lowered to the mowing position (see FIG. 2) to perform mowing transmission, the drive belt 10 between the drive shaft 11 and the counter shaft 14 is countered as the mowing deck 3 is lowered. The position of the pulley 13 is rotated downward and forward by the parallel links 8 and 9 in the forward ascending and inclined form, so that the vertical deviation of the belt line of the drive belt 10 and the change in the spacing are absorbed and mitigated, so that the accuracy is correct. Stable transmission.

The engine E for transmitting the blade shaft 2 of the mowing deck 3 that moves up and down with respect to the vehicle body 5 is configured to be tiltable to the left and right around the support member 16 along the center line L of the mowing machine vehicle body 5. Therefore, the left and right inclined postures of the engine E are controlled symmetrically with respect to the center line L of the vehicle body 5, and even on a left-down sloped ground with respect to the mowing traveling direction, and also on a right-down sloped ground. In, the mowing work can be performed with almost the same work operation feeling. In particular, during mowing, the mowing deck 3 descends from the vehicle body 5 via the parallel links 8 and 9 to be in the mowing posture, so that the lower drive pulley 12b of the drive shaft 11 and the upper counter pulley 13a of the counter shaft 14 are in the mowing posture. The belt line of the drive belt 10 hung between the two and the belt is displaced in the vertical direction, and when the engine base 15 tilts and rotates from this state, the drive belt 10 is twisted, but in parallel. By rotating the links 8 and 9, the counter shaft 14 and the counter pulley 13 are operated so as to slightly deviate to the front lower side position, and the overtension pressure and relaxation of the drive belt 10 are sucked and relaxed, and the drive pulley is used. It is possible to prevent the drive belt 10 from coming off from the counter pulley 13 and the counter pulley 13, and to smoothly carry out the tension transmission and the transmission of the blade shaft 2, so that the transmission and the mowing work can be performed stably.

Further, as a thing that changes the transmission power of the blade shaft 2 in the grass cutting deck 3, there is a cutting clutch 20 that turns on and off the transmission rotation of the blade shaft 2, but the cutting clutch 20 in the present invention is the front on the center line L. The cutting belt 19 hung between the counter pulley 13 on the counter shaft 14 arranged later and the blade pulley 17 on the blade shaft 2 is tensioned and relaxed by the tension pulley 18 to enter and cut the transmission. Therefore, stable cutting work can be performed without being affected by the vertical movement of the cutting deck 3 and the fluctuation of the vertical inclination of the engine E.

Further, since the engine base 15 is configured to incline left and right around the support members 16 and 16 at the position above the counter pulley 13, a rotation space at a predetermined interval is required between the counter pulley 13 and the engine base 15. In this space, the V-belt 58 transmission between the upper pulley 55 of the drive shaft 11 and the alternator 25 or the V-pulley 57 of the hydraulic pump is arranged, and the V-belt 58, the drive belt 10, and the cutting belt 19 are arranged in this order from the top. Since the engine base 15 is set low, the height of the engine base 15 can be set low, and the vehicle body 5 can be maintained in a stable state with a low center of gravity.

A side view showing the transmission mechanism of the mower. A side view of the mower showing the mowing position of the mowing deck and the mowing transmission state. A side view of the mower showing the mounting state of the mower deck with parallel links. A side view of the mower showing the ascending / descending state of the mowing deck. The plan view of the mower which shows the belt transmission mechanism of the blade shaft part. A partial plan view showing the belt transmission mechanism and the operation mechanism of the cutting clutch. Top view of the mower showing the alternator's transmission mechanism. The rear view which shows the left-right tilt rotation state of the engine with respect to the vehicle body running on an inclined surface. The rear view which shows the left-right tilt rotation state of an engine with respect to a vehicle body. External plan view of the mower. A block diagram of the controller for performing mowing work with the mower. A plan view of a transmitter that transmits a control signal to a controller that causes the mower to perform mowing work.

Based on the drawings, the mower has a traveling motor M for driving the crawler 4 and a transmission case 22 at the upper rear end of the vehicle body 5 equipped with a pair of left and right traveling crawler 4 mainly made of a rubber material. A controller 23 for running, mowing operation, and control is provided, an engine E for driving the blade shaft 2 of the mowing deck 3 is mounted on the front end portion, and a battery 24a for starting the engine E is mounted on the front and rear center portions. It is equipped with a fuel tank 26, a battery 24b for driving a motor M, an alternator 25 for charging the battery 24b, and the like. A guard frame 28 connected in an arch shape is provided between the guard pipes 27 at the front and rear ends in the upper portion of the vehicle body 5, and a cover 29 is provided so as to cover the upper portion of the various mounted devices to protect the vehicle body 5. ..

The crawler 4 includes end wheels 32, intermediate wheels 33, which are arranged in the front-rear direction of the left and right track frames 31 mounted on the support legs 30 which are erected downward from the left and right side ends of the vehicle body 5. The left and right crawlers 4 are rotated by being hung on the drive sprocket 34 and the like at the rear end portion and being transmitted and rotated on the sprocket shaft 35 via the transmission gear and the like of the transmission case 22 by the left and right traveling motors M. Then, it can run or steer.

At the bottom of the vehicle body 5, the parallel links 8 and 9 that move up and down the grass cutting deck 3 on which the blade shaft 2 of the blade 1 for cutting grass is mounted on the right crawler 4 and 4 interval portion (tread portion). It is pivotally attached to the rear end portion with link pins 36 and 37 and attached detachably. Further, the parallel links 8 and 9 are rotatably provided around the lateral link shafts 6 and 7 provided on the bearing brackets having the front ends formed on the left and right front ends of the vehicle body 5 and left. , Via the lift link 39 by the rotation of the lift arm 38 which is pivotally attached to the rear ends of the four parallel links 8 and 9 on the right by the link pins 36 and 37 and rotated by the expansion and contraction of the electric cylinder 50. Then, the mowing deck 3 is moved up and down while maintaining a posture parallel to the mowing ground. At the highest position of the mowing deck 3, the upper surface of the ceiling of the mowing deck 3 is set so as to approach the bottom surface of the vehicle body 5 and be in the upper limit position of the mowing height or the non-cutting height range. Further, in the state where the mowing deck 3 is lowered to the lowest position, the mowing height of the grass mowed by the blade 1 rotated in the mowing deck 3 is at the lowest position, and the mowing deck 3 is located at the front end, the rear end portion, or the like. In the form in which the gauge foil is attached, this minimum cutting height position can be held on the ground.

In the mowing deck 3, a blade shaft 2 in the vertical direction is rotatably mounted at the center thereof, and a central portion of a blade stay 40 in which the blade 1 is arranged on the outer peripheral portion is attached to the lower end portion of the blade shaft 2. A blade pulley 17 in the form of a V-pulley that guides rotation by fitting a cutting belt 19 made of a V-belt having a V-shaped cross section to the upper end of the blade shaft 2 is attached to the upper portion of the mowing deck 3.

A counter shaft 14 in a vertically parallel state is rotatably erected on the upper side of the mowing deck 3 at a position immediately after the blade shaft 2, and a V-pulley-shaped counter pulley 13 is provided on the counter shaft 14. The counter pulley 13 is provided with an upper counter pulley 13a at the upper part and a lower pulley 21 at the lower part. A cutting belt 19 in the form of a V-belt is hung between the lower pulley 21 of the counter shaft 14 and the blade pulley 17 of the blade shaft 2 on the front side, and the tension pulley 18 is tensioned on the rotating outer peripheral surface of the cutting belt 19. By relaxing, the transmission from the counter shaft 14 to the blade shaft 2 can be input and cut. The clutch arm 41 of the tension pulley 18 is pivotally attached to the pivot shaft 42 on the upper surface of the mowing deck 3 on the outer peripheral portion of the lower pulley 21, and the operation wire 43 connected to the clutch arm 41 is electrically expanded and contracted. It is connected to the clutch 20 and the operation arm 45 which is rotated around the arm shaft 46 by the electric cylinder 44 for the blade shaft 2 brake, and the cutting clutch 20 by the tension pulley 18 is engaged by the expansion / contraction operation of the electric cylinder 44. It is a form to cut. (See FIGS. 5 and 6)

Further, on the upper surface of the mowing deck 3 around the blade pulley 17, a brake arm 47 that fits and slides into the V groove portion of the blade pulley 17 to apply a brake to the rotation of the blade shaft 2 is provided around the arm shaft 48. The operation arm 45 is rotatably provided and is connected to the operation arm 45 which is rotated around the arm shaft 46 by the electric cylinder 44 with an operation wire 49, and the operation arm 45 is cut by the extrusion rotation of the electric cylinder 44. Rotate from the clutch 20 disengagement position b to the entry position a, pull the wire 43, tension the tension pulley 18 of the cutting clutch 20 and the clutch arm 41 on the cutting belt 19, and move the cutting clutch 20 to the transmission position. , Can be in a state. At this time, the operation arm 45 is rotated from the blade position f to the brake release position e, so that the operation wire 49 is pulled and the brake arm 47 is rotated around the arm shaft 48, so that the blade pulley 17 is rotated. The brake shoes 47s that are fitted and pressed into the V pulley groove of the above are separated in the outer peripheral direction to release the braking force, and the cutting transmission from the counter shaft 14 to the blade shaft 12 is smoothly performed by the cutting belt 19. Let me.

Further, the cutting clutch 20 operated via the electric cylinder 44, the operation arm 45, the operation wires 43, 49, the clutch arm 41, the brake arm 47, etc., and the brake arm 47 shorten the operation of the electric cylinder 44. By rotating the operation arm 45 from the clutch engagement position a to the disengagement position b, the cutting clutch 20 is separated from the cutting belt 19 and becomes a transmission release position via the operation wires 43 and 49, and the brake arm is set. The brake shoes 47s of 47 are in sliding contact with the V-groove portion of the blade pulley 17 of the blade shaft 2 to bring the blade shaft 2 into a braking state.

The engine base 15 has a trapezoidal bracket arm 51 formed at the front and rear edge portions of the bottom portion to reinforce the support configuration of the engine E and the like, and the support member 16 on the center line L with respect to the vehicle body 5. It is configured so that the left and right rotation range can be easily set around the. A support metal 53 is provided at the center position in the horizontal direction of the cross rail 52 extending in the left and right lateral directions in the front and rear of the vehicle body 5, and the lower center center of the bracket arm 51 is provided between the front and rear support metals 53. The support member 16 provided in the portion is fitted and supported, and the engine base 15, which is normally located in a horizontal posture in the left-right direction, rotates with respect to the vertical direction line Y of the vehicle body 5 over an appropriate angle θ range on the left and right. It has a movable configuration. The rotation of the engine base 15 includes an inclination sensor S1 that detects the left and right inclination angles α of the mowing ground on which the vehicle body 5 travels, and a transmission cylinder 54 that rotates the engine base 15 left and right with respect to the vehicle body 5. The left and right effective angle θ regions are determined in advance to several angles (for example, the control angle θ is 10 °, 18 °, 25 °, etc.), and manually or manually. The angle is automatically controlled so that the mounting posture of the engine E on the sloped mowing ground can always be maintained at the vertical posture Y or the angle within the tilt allowable range of the engine E.

The engine E is mounted on the front portion of the engine base 15, and the batteries 24a and 24b for starting the engine E and driving the motor M, the fuel tank 26, the alternator 25, and the like are mounted on the rear portion thereof. Although they are mounted, they are arranged and mounted so that the weight of the entire vehicle body is distributed symmetrically with respect to the support member 16. The drive shaft 11 of the engine E projects vertically downward at the front position of the engine base 15, and a pulley with two upper and lower V-shaped belt grooves is formed on the drive shaft 11 to form a lower portion on the lower side. A drive belt 10 is hung between the drive pulley 12b and the upper counter pulley 13a of the counter pulley 13 at the rear of the mowing deck 3, and the tension pulley 60 is tensioned to constantly rotate and transmit. Further, a virtual straight line in the front-rear direction extending between the front-rear support members 16 at the bottom of the engine base 15 is set as the center line L at the left-right center position of the mowing machine body 5, and this center line L and the mowing deck 3 are the most. The belt line A1 at the center of the upper and lower parts of the drive belt 10 in the raised position is set in a parallel shape having substantially the same height in the side view. An upper V pulley 55 for driving the alternator 25 is provided on the upper side of the drive pulley 12, and is located between the upper V pulley 55 and the V pulley 57 attached to the rotating shaft 56 of the alternator 25 mounted on the rear portion thereof. The V-belt 58 is hung and the tension pulley 59 is tensioned to constantly rotate and transmit.

In the abdomen of the mowing machine body 5, the drive shaft 11 and the rotating shaft 56 of the alternator 25 hang down from the upper side of the engine base 15, and the upper end of the blade shaft 2 protrudes above the mowing deck 3 at the bottom. At the same time, the counter shaft 14 is erected, and is erected in parallel on the center line L in the front-rear direction with a front-rear interval. In the state of being raised to the upper limit position (see FIG. 1) of the mowing deck 3, the upper counter pulley 13a of the counter shaft 14 is at substantially the same height as the lower drive pulley 12b at the lower end of the drive shaft 11, and these lower drive pulleys. The drive belt 10 stretched between the 12b and the upper counter 13a is configured and set so as to be hung in a substantially horizontal form in the front-rear direction. In this state, the drive belt 10, the cutting belt 19, and the V-belt 58 are hung horizontally and in parallel, and the vertical distance is close to each other, so that the position of the blade 1 can be raised to a high position. In the plan view, the drive shaft 11, the blade shaft 2, and the counter shaft 14 may be arranged side by side so that all the shafts coincide with the center line L, but the drive shaft 11 is not necessarily located at the center position on the left and right sides of the vehicle body 5. It is not necessary to arrange the blade shafts 11 to the left or right depending on the arrangement of the drive shaft 11 of the engine E. When a pair of left and right blade shafts 11 are provided, the blade shafts 11 are distributed to the left and right of the plan view center line L. You may let me.

The drive belt 10 composed of a V-shaped belt spanned between the lower drive pulley 12b and the upper counter pulley 13a is provided with a tension pulley 60 near the outer peripheral portion of the lower drive pulley 12b, and the drive belt 10 is always stretched in a transmission form. I'm pressing. The tension pulley 60 is rotatably provided at the tip of a tension arm 92 pivotally supported by a pivot shaft 91 of an upper engine base 15, and is tensioned to a drive belt 10 by a spring 93. Further, this tension pulley 60 is for contacting the back surface of the V-shaped drive belt 10, is configured as a flat pulley (roll form), and has a V-shaped guide rib 64 formed on the upper and lower end edges of the pulley 60 at an appropriate height. Prevents derailment rotation of the drive belt 10 made of a V-shaped belt that is hung between the lower drive pulley 12b made of pulleys and the upper counter pulley 13a and guided by rotation from these lower drive pulleys 12b and upper counter pulley 13a. do. The distance between the upper and lower guide ribs 64 of the tension pulley 60 is formed to be slightly wider than the contact pressure rolling width of the drive belt 10, and the drive belt 10 is slightly displaced up and down when the mowing deck 3 is moved up and down. Even if the base 15 swings to the left or right, the front and rear ends of the drive belt 10 are deeply fitted into the V-shaped groove portions of the lower drive pulley 12b and the upper counter pulley 13a to be transmitted and guided. Derailment and derailment are unlikely to occur.

Further, mainly in FIG. 10, 61 is an engine starter, 62 is a fuel filler lid, and is provided at the fuel filler port portion of the cover 29. 63 is a fuel tank cap of the fuel tank 26, 64 is an emergency stop switch, 65 is an hour meter, and 66 is a throttle lever.

The receiver 71 that receives transmission from the radio transmitter radio 70 on the input side of the controller (having a CPU) 23 for controlling the mowing running by the mowing machine, and the left and right of the vehicle body 5. A tilt sensor S1 for detecting the tilt angle, a motor M for traveling on the left and right, and temperature sensors S2, S3, and S4 for detecting the temperature of the oil neter 25 are provided, and a variable resistor R1 for an engine tilt cylinder is provided. A variable resistor R2 for a cutting height electric cylinder, a variable resistor R3 for a cutting clutch electric cylinder, and the like are provided (see FIG. 11).

Further, on the output side of the controller 23, various alarm lights 72, an error display unit 73 also used as a battery fuel gauge, and the like are provided. Further, an electric cylinder 54 for inclining the engine E, an electric cylinder 50 for adjusting the cutting height, an electric cylinder 44 for engaging and disengaging the cutting clutch 20, and the like are arranged. Further, the control times 74, 75 and the like of the motor M for driving the drive sprocket 34 of the left and right crawlers 4 are arranged.

The radio 70 has a signal transmission / reception antenna P, a slide switch 76 for a radio power supply on the upper center surface, and front and rear rotation operations for traveling forward and backward on both left and right sides thereof. , The reverse lever 77 and the turning lever 78 that rotates left and right to operate the traveling turning direction are arranged. In addition, a liquid crystal display 79 may be provided at the bottom of the radio 70 to display the running state, working state, error, and the like of the mower. A touch sensor 80 for a liquid crystal display is provided on this one side. Further, in the central portion of the upper part, a dial 81 capable of arbitrarily adjusting the maximum speed, a dial 82 for adjusting the mowing height, and the like are provided. On the left side of these, the cutting clutch lever 83 for engaging and disengaging the cutting clutch 20, and the switching lever 84 for switching various operations and operations between automatic and manual, and switching between automatic and maintenance mode, And a buzzer lever 85 or the like for transmitting an alarm buzzer is arranged. Further, an engine start switch 86, an engine stop lever 87, and the like are provided on the right side portion. The cell rotates while the start switch 86 is pressed, and the cell stops when the cell is held for 5 seconds or longer. The cell does not rotate when the engine stop lever 87 is in the stop position. Further, a manual mowing height adjusting lever 88 that can manually raise and lower the mowing height, a manual engine tilting lever 89, and the like are provided at these aides to facilitate maintenance work. By operating these manual cutting height adjusting lever 88 and manual engine tilting lever 89, the electric cylinder 50 or 54 can be expanded and contracted to raise and lower the mowing deck 3 and change the tilt of the engine E.

1 Blade 2 Blade shaft 3 Mowing deck 4 Crawler 5 Body 6 Link shaft 7 Link shaft 8 Parallel link 9 Parallel link 10 Drive belt 11 Drive shaft 12 Drive pulley 12b Lower drive pulley 13 Counter pulley 13a Upper counter pulley 14 Counter shaft 15 Engine base 16 Support member 17 Blade pulley 18 Tension pulley 19 Mowing belt 20 Mowing clutch 21 Lower pulley 25 Alternate 36 Link pin 37 Link pin 55 Upper V pulley 56 Rotating shaft 57 V pulley A1 Belt line E Engine H Specified height L Center line M motor

Claims (1)

The front end of the link is the vehicle body (5) of the traveling vehicle body (5) traveling with the pair of left and right crawler (4) on the grass cutting deck (3) equipped with the blade shaft (2) of the grass cutting blade (1). Two pairs of front and rear that rotatably support the rear end of the link around the link shafts (6) and (7) on the 5) side and around the link pins (36) and (37) on the mowing deck (3) side. The engine base (15) is provided on the upper side of the mowing deck (3), and the blade shaft is attached to the engine base (15). The engine (E) is mounted in the front position of (2), and the upper and lower two-stage drive pulleys (12) are attached to the drive shaft (11) protruding downward from the engine base (15) to form the engine (2). Behind E), an alternator (25) is provided in the case of running drive by an electric motor, and a hydraulic pump is placed in the case of running drive by a hydraulic motor, and a rotary shaft protruding downward from the engine base (15) is provided. A V pulley (57) is attached to (56), and a counter shaft (14) with two upper and lower counter pulleys (13) attached stands behind the grass cutting deck (3) side of the blade shaft (2). The blade pulley (17) is attached to the blade shaft (2) projecting upward from the mowing deck (3), and between the upper V pulley (55) and the V pulley (57) of the drive pulley (12). Along with stretching the V-belt (58), a drive belt (10) is stretched between the lower drive pulley (12b) and the upper counter pulley (13a), and the lower pulley (21) and the blade pulley of the counter pulley (13) are stretched. A cutting belt (19) having a cutting clutch (20) that can be tensioned and relaxed by a tension pulley (18) is hung between (17), and the engine base (15) is attached to the front end of the engine base (15). And at the rear end, at a position lower than the engine (E) mounting surface by a predetermined height (H), and around the support member (16) provided in the center of the left and right, it is configured to be rotatable left and right, and the front and rear The center line (L) is a virtual straight line in the front-rear direction extending between the support members (16) and (16), and the center line (L) in a substantially horizontal state in the side view and the mowing deck (3) are the highest heights. The drive belt (10) and the belt line (A1) when raised to the above position are set to be approximately the same, and the mowing height can be adjusted by moving the mowing deck (3) up and down with this position as the upper limit. A blade transmission device for a mowing machine, which is characterized by the fact that it has been done.

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