JP4389045B2 - Lawn mower - Google Patents

Description

The present invention, turfgrass, or weeds (hereinafter, turf grass) relates arrangement of the mower reap.

  Conventionally, a riding lawn mower has been provided with a pair of left and right cutters, and the left and right cutters are shifted in phase with each other and the rotation regions are partially overlapped with each other. What is covered with the mower deck formed in circular arc shape along the outer periphery of this rotation locus is known.

The lawn mower is formed in an arc shape along the outer circumference of the cutter's rotation trajectory so that turf grass cut off in the mower deck can be efficiently discharged using the wind generated by the cutter rotation to the rear collector. Alternatively, the rotation regions of the left and right cutters are partially overlapped and rotated inward from each other.
JP 2003-289709 A (FIG. 3)

  However, as shown in FIG. 4, in the conventional configuration, since the center part in front of the deck is a recess, the front turfgrass easily gathers along the recess shape as the vehicle body moves forward during lawn mowing work. However, even if it entered the mower deck, it was difficult to get up and return, and there was a problem that the cutter cut the sky and left uncut.

  An object of the present invention is to improve the mowing performance by improving the mower structure to eliminate the above problems.

In order to solve the above problems, the present invention has taken the following technical means.
That is, the engine (2) is mounted on the front part of the vehicle body, the rotational power of the engine (2) is transmitted to the transmission in the transmission case, and the rotational power decelerated by the transmission is transmitted to the left and right front wheels (3, 3). To the left and right rear wheels (4, 4), and the mower (7) is moved up and down via a link mechanism on the abdomen of the vehicle body between the front wheels (3, 3) and the rear wheels (4, 4). A cutter drive shaft that supports the pair of cutters (9, 9) of the mower (7) via a universal joint and a belt-type interlocking mechanism that supports the front PTO shaft (8) below the engine (2) freely. (12p, 12p), the pair of cutters (9, 9) are provided facing left and right, and the rotation regions of the left and right cutters (9, 9) are partially overlapped at the left and right central portions. Before and after the left and right cutters (9, 9) Provided with a mower deck (10) formed along the outer circumference of the rotation trajectory of the left and right cutters (9, 9), and a bearing member for the left and right cutter drive shafts (12p, 12p). The support plate (21L, 21R) is projected from (15a) toward the front inside which is the rotation outward of the cutter drive shaft (12p, 12p), and a screw portion (22a) is provided at the tip of the support plate (21L, 21R). ) Is provided with a stopper (22) that can be adjusted up and down, the stopper (22) is brought into contact with the upper surface of the mower deck (10), and the center portion of the cutter (9) is placed on the lower end surface of the cutter drive shaft (12p, 12p). Is attached to the gear box (13) provided on the upper surface of the mower deck (10) through the plate member (19), and the belt drive shaft (11 Between the input pulley (14) fixed to the upper end of the belt drive shaft (11) and the drive pulleys (12, 12) of the left and right cutter drive shafts (12p, 12p). The belt drive shaft (11) is rotated inwardly with the phases of the left and right cutters (9, 9) being shifted from each other by 90 degrees. The belt drive shaft (11) extends downward and the overlapping portion (R) Auxiliary cutter (17) having the same rotational diameter as the left and right widths and mowing turf grass in front of the center of mower deck (10) is supported on belt drive shaft (11) at the same height as cutter (9, 9). A shooter (31) for discharging the cut grass to the collector bag (30) at the rear of the vehicle body is provided at the center rear portion of (10), and the lower end edges of the left and right side plates (40L, 40R) of the shooter (31) are connected to the shooter (31 ) Bottom plate (3 2), the bottom plate (32) is pivotally supported around the support shaft (33) so that it can be opened and closed, and the bottom plate is opened and closed by a bottom plate opening / closing lever (34) provided on the side of the cockpit. A lawn mower characterized in that it can be switched between a state in which (32) is opened and closed and the mowing grass is directly released to the ground and a state in which it is collected in the collector bag (30) .

  When the mowing operation is performed, the lawn mower is advanced while rotating the two cutters (9, 9). At this time, the turfgrass is mowed in the mower deck (10), but the turfgrass entering from the front of the center of the deck is laid down along the traveling direction at the turfgrass pressing part (10a).

According to the present invention, the left and right cutters (9, 9) are supported so as to rotate by shifting the phase by 90 degrees, and this rotation region is provided with an overlapping portion (R) partially overlapping at the left and right central portions. In the overlapping portion (R), the blades of the left and right cutters (9, 9) come alternately, and the cut grass can be efficiently discharged to the rear shooter (31) .

The belt drive shaft (11) is extended downward to support the auxiliary cutter (17) having the same height as the cutters (9, 9) and the same rotational diameter as the left and right widths of the overlapping portion (R). Therefore, it is possible to reap before entering the turf grass is located in central front of the mower deck (10) to the mower deck (10), that connected to the cutting leaving prevented.

Further , conventionally, when the transmission belt is strongly tensioned, the cutter drive shaft is warped in the belt tension direction, and accordingly, the cutter drive shaft is tilted, the cutting surface of the cutter at the lower end is tilted, and the cutting height is changed. However, the support plates (21L, 21R) protrude from the bearing members (15a) of the left and right cutter drive shafts (12p, 12p) toward the front inner side which is the rotation outward of the cutter drive shafts (12p, 12p). Then, a stopper (22) that can be adjusted up and down by a screw portion (22a) is provided at the tip of the support plate (21), and the stopper (22) is brought into contact with the upper surface of the mower deck (10), so that the cutter drive shaft The tilt deformation of (12p, 12p) can be prevented.

Also, if the lower edge of the side plate of the shooter and the bottom plate of the shooter are at the same height as in the prior art, grass will be sandwiched between them, making it difficult to open and close the bottom plate. By extending the lower end edges of the side plates (40L, 40R) on both sides below the position of the bottom plate (32) of the shooter (31), grass is not caught and the bottom plate can be opened and closed smoothly.

The present invention will be described below with reference to the drawings.
As shown in FIG. 1, the riding lawn mower 1 uses an agricultural tractor body, and the lawn mower 1 has an engine 2 mounted on the front of the body, and the rotational power of the engine 2 is transmitted. The transmission is transmitted to the transmission in the case, and the rotational power decelerated by the transmission is transmitted to the left and right front wheels 3 and 3 and the left and right rear wheels 4 and 4. Further, a steering hand 5 for steering the left and right front wheels 3 and 3 is provided in front of the cockpit 6, and a bottom plate opening / closing lever 34 for opening and closing the bottom plate of the shooter 31 is provided on the side.

  The mower (cutting device) 7 is supported by a vehicle body abdomen between the front wheel 3 and the rear wheel 4 of the lawn mower 1 via a link mechanism so as to be able to move up and down, and the front PTO shaft 8 below the engine 2 can freely rotate. The cutter drive shafts 12p and 12p that support the cutters 9 and 9 are driven via a joint and a belt-type interlocking mechanism.

  The structure of the mower 7 will be described. As shown in FIG. 2, the mower 7 includes a pair of left and right cutters 9 and 9 that face each other right and left and rotate inward from each other. It is the structure covered with the mower deck 10 formed along the locus | trajectory outer periphery. Further, the mower deck 10 is configured in a “8” -shaped housing so as to cover the front, rear, left, right, and upper sides of the left and right cutters 9, and a shooter 31 on the lawn mower 1 side is provided at the center of the rear of the deck. The turf grass cut in the deck 10 is discharged through the shooter 31 into the collector 30 at the rear of the vehicle body.

In the figure, reference numeral 24 denotes an air intake port for taking air into the cutter, and reference numeral 25 denotes a cover that covers the belt-type interlocking mechanism.
Further, as shown in FIG. 3, the mower 7 projects the support plates 21L and 21R to the bearing members 15a of the left and right cutter drive shafts 12p and 12p so that the support plates 21L and 21R rotate outwardly, and in the example, toward the front inner side. The stopper 22 is provided at the front end of the support plate 21 so that the vertical movement of the support plate 21 can be adjusted by the screw portion 22a. The stopper 22 is in contact with the upper surface of the mower deck 10.

  Thus, conventionally, when the transmission belt 16 is strongly tensioned, the cutter drive shafts 12p, 12p are warped in the belt tension direction, and accordingly, the cutter drive shafts 12p, 12p are tilted and the cutting surfaces of the cutters 9, 9 at the lower end are tilted. However, the tilting deformation of the cutter drive shafts 12p and 12p can be prevented by providing the left and right stoppers 22 and 22 as in this example.

  The lower portions of the cutter drive shafts 12p, 12p are supported by a spacer member 15b fixed to the mower deck 10, and the center portion of the cutter 9 is bolted to the lower end surface of the coaxial 12p with a bolt 18 via a plate member 19. It is configured to be attached while being pressed. Further, the left and right cutters 9 and the spacer member 15b are connected by a plurality of shear pins 23, and are sheared when a predetermined load or more is applied.

  Accordingly, for example, when a shear pin is provided between the cutting input shaft 14p and the pulley 14, the transmission belt 16 is interposed between the cutting input shaft 14p and the cutter drive shaft 12p, so that the impact is not easily transmitted. It is assumed that the belt will break without breaking, or the shaft of the idle pulley will be bent, but this problem can be solved by providing the shear pins 23 on the left and right cutter drive shafts 12p as in this example. can do.

  The left and right cutters 9 and 9 are supported so as to rotate by shifting the phase by 90 degrees, and this rotation region is configured to partially overlap at the left and right central portions (hereinafter, overlapping portion R). Thereby, in the said overlapping part R, the blades of the right and left cutters 9 are alternately visited, and the cut grass is efficiently discharged to the rear shooter 31.

  As shown in FIG. 4, the center portion of the conventional mower deck 10 is formed with a concave portion 10v on the front surface, and turfgrass gathers along the shape of the concave portion along with the progress of the vehicle body and falls on the front wall portion of the deck. It had been. In the mower in which the two left and right cutters 9 and 9 are rotated with the rotation region partially overlapped at the center, when the turfgrass that has been lying down approaches this overlapping portion R, these turfgrass There was a problem that the upper part of the kind was frequently slid and passed through the deck without having an opportunity to return from the lying down state compared to other parts, that is, left uncut.

  In view of the above problems, in the present invention, as shown in FIG. 5, a collar portion 10 a (turfgrass) having a surface perpendicular to the traveling direction in the front center portion of the mower deck 10, specifically, in front of the left and right widths of the overlapping portion R. The pressing part) is formed.

  In the lawn mower 1 configured as described above, when performing the cutting operation, the vehicle body is advanced while rotating the two cutters 9 and 9. At this time, turfgrass entering from the front of the central portion of the mower deck 10 is laid down along the traveling direction at the heel portion 10a. Therefore, the concentration of turf grass is eliminated, that is, the entanglement between the grasses is reduced and the plant stands up early, so that the cutters 9 and 9 do not cut the sky and lead to prevention of uncutting. Further, it is possible to prevent foreign matters from entering the deck by the collar portion 10a as much as possible.

Similarly, the following configuration may be used as a means for reducing uncut residue. In addition, description is abbreviate | omitted about the location with the same structure in a figure.
In the mower 7 shown in FIG. 6, a cutout portion 10 c having an appropriate vertical width H is provided in front of the central portion of the mower deck 10.

  As a result, when the mowing operation is performed, the lawn mower 1 is moved forward while rotating the two cutters 9 and 9. At this time, the turfgrass is cut within the cutter deck 10, but the turfgrass entering from the front of the center of the deck 10 enters the deck 10 through the notch 10c. Therefore, since turfgrass is not laid down deeply, the cutters 9 and 9 do not cut the sky, leading to prevention of uncutting.

  Moreover, as another form of the structure having the notch portion 10c, as shown in FIG. 7, the upper portion of the notch portion 10c is covered with a flange portion 10a along the rotary outer peripheral portion of the cutters 9 and 9. It is also good.

Thereby, the turf grass discharge | released ahead from the deck 10 can be suppressed as much as possible.
Furthermore, in another form of this invention, as shown in FIG. 8, it is good also as a structure which has the said collar part 10a and the notch part 10c together.

  That is, a collar portion 10a having a surface perpendicular to the traveling direction is formed on the front surface of the central portion of the mower deck 10, and the collar portion 10a is set higher than the deck front wall portions on both the left and right sides, and is notched. It is set as the structure which forms the part 10c.

  Thus, as described above, the turfgrass positioned in front of the center of the deck does not fall down deeply and enters the deck, so that the cutters 9 and 9 do not cut the sky, leading to prevention of uncutting. Further, since the front of these cutters 9 and 9 is covered with the hook portion 10a, the cut turfgrass is prevented from being discharged forward from the deck 10, and when the maintenance is performed, the cutters 9 and 9 This will help prevent injury caused by rotation.

Furthermore, as another form of the collar portion, as shown in FIG. 9, the front surface of the central portion of the mower deck 10 may be provided with a protruding portion 10 b that has a convex shape toward the front.
According to this, the turfgrass located in front of the central portion of the mower deck 10 is divided into left and right by the projection 10b, that is, the turf grasses 9 and 9 are positioned so as to avoid the cutting overlap portion R as much as possible. Therefore, turfgrass is mowed at two places, front and rear, so that the overlaid turfgrass is easy to rise and return, thus preventing uncutting.

  Furthermore, as means for preventing uncut portions of the overlapping portion, as shown in FIG. 10, the gear box 13 on the upper surface of the mower deck 10 may be improved and an auxiliary cutter 17 may be provided at the lower portion.

  Specifically, the gear box 13 is provided with a belt drive shaft 11 installed in the vertical direction. The input pulley 14 fixed to the upper end of the belt drive shaft 11 and the drive pulleys 12 of the left and right cutter drive shafts 12p and 12p, The transmission belt 16 is turned between 12 and the left and right cutters 9, 9 are interlocked so as to rotate inward. And this drive shaft 11 is improved, As the structure which extends the coaxial 11 below, and supports the auxiliary cutter 17 which has the same diameter as the said cutters 9 and 9 and the rotation diameter equivalent to the left-right width of the said overlap part R is provided. Yes.

As a result, turfgrass positioned in front of the center of the deck can be mowed before entering the mower deck 10, which leads to prevention of uncutting as in the above.
Hereinafter, a detailed configuration of the riding lawn mower 1 will be described.

A shooter 31 for discharging turfgrass to the rear collector back 30 is provided at the center rear portion of the mower deck 10. The shooter 31 is pivotally supported so that the bottom plate 32 can swing and open around the support shaft 33, and can be switched between a state in which the cut grass is directly mowed to the ground and a state in which the grass is fed and collected in the collector back 30. Yes. That is, the shooter bottom plate 32 includes a bottom plate opening / closing lever 34 that can be rotated around a fulcrum P, and upper and lower swing links 35 and 36 (the first swing link 35 on the upper side and the second swing link 36 on the lower side). And a bottom closed state (feeding and collecting state to the collector back) shown in FIG. 12 and a bottom part opened state (cutting to the ground) shown in FIG. It is the structure which can be switched to (state).

In the bottom opening state of the bottom plate 32 shown in FIG. 13, a swing link 35 by engaging holding the lock pin 38 to the vertical frame 3 7 of the machine body side is configured to maintain an open fixed state of the bottom plate Yes.

  Further, the left and right side plates 40L and 40R of the shooter 31 are configured such that the lower end edges thereof are extended downward (L intervals) below the fixed position of the shooter bottom plate 32, as shown in FIG. If the lower edges of the side plates 40L and 40R and the shooter bottom plate 32 are at the same height as in the prior art, grass will be sandwiched between them, making it difficult to open and close the bottom plate. If comprised like the said example, there will be no pinching of grass and smooth bottom plate opening and closing will be attained.

  Further, the collector back 30 is configured to move up and down by the piston expansion and contraction of the lifting cylinder 41 and to make a scooping dump operation by the piston expansion and contraction of the dump cylinder 42. Each hydraulic hose 44 connected to the cylinders 41 and 42 is in a state along the link arm 43 by a leaf spring-shaped C-type clamp member 46 as shown in FIGS. 15 and 16, and as shown in FIG. As shown to (B), it is set as the structure attached in the state which pressed the corrugated tubes 45 and 45 lightly.

  Conventionally, the structure of tightening with a resin-made band is disadvantageous in that the tightening force is weak, the tightening position is easily shifted, and it is easy to break. According to this, since it can be pressed in a wide range of planes, it is possible to prevent displacement and to maintain a sufficient tightening force without loosening, and there is an advantage that the above problems can be solved. In addition, it is easy to attach and detach.

The side view of a riding lawn mower. A top view of the mower. The upper and lower cutting figure which shows the cutter drive part of a mower deck. The perspective view of the conventional more deck. The perspective view of the principal part of the mower deck concerning Claim 1. The perspective view of the principal part of the mower deck concerning Claim 2. The perspective view of the principal part of the mower deck which shows an application example. The perspective view of the principal part of the mower deck which shows an application example. The perspective view of the principal part of the mower deck which shows an application example. 4. A vertical sectional view of a gear case of a mower according to claim 3 (partially improved). The top view which shows the circumference | surroundings of a shuta. The side view which shows the circumference | surroundings of the shooter which shows the state which closed the baseplate. The side view which shows the circumference | surroundings of the shooter which shows the state which open | released the baseplate. The front view which cut | disconnected the shuta. Side view showing the raised state of the collector back (A) The side view of the link arm which shows the state holding the hydraulic hose. (B) S1-S1 cross section

2 engine 3 front wheel 4 rear wheel 7 mower 8 front PTO shaft 9 cutter 10 mower deck
11 belt drive shaft 12p cutter drive shaft
12- drive pulley
13 gearbox
14 input pulley
15a bearing member
16 transmission belt
17 auxiliary cutter
18 volts
19 plate members
21L support plate
21R support plate
22 stoppers
22a screw part
30 collector bag
31 Shooter
32 bottom plate
33 spindles
34 Bottom plate opening / closing lever
40L side plate
40R side plate
R overlapping part

Claims (1)

The engine (2) is mounted on the front part of the vehicle body, the rotational power of the engine (2) is transmitted to the transmission in the transmission case, and the rotational power decelerated by the transmission is transmitted to the left and right front wheels (3, 3). It is configured to transmit to the rear wheels (4, 4), and the mower (7) can be moved up and down via a link mechanism on the abdomen of the vehicle body between the front wheels (3, 3) and the rear wheels (4, 4). A cutter drive shaft (12p) that supports and supports the pair of cutters (9, 9) of the mower (7) via a universal joint and a belt-type interlocking mechanism for rotating the front PTO shaft (8) below the engine (2) , 12p), and the pair of cutters (9, 9) are provided facing left and right, and the rotation regions of the left and right cutters (9, 9) are partially overlapped at the left and right central portions. (R) is provided, and the left and right cutters (9, 9) A mower deck (10) formed along the outer circumference of the rotation trajectory of the left and right cutters (9, 9) is provided, and the bearing member (15a) of the left and right cutter drive shafts (12p, 12p) is provided. ) Projecting from the support plate (21L, 21R) toward the inside of the front of the cutter drive shaft (12p, 12p), and by a screw portion (22a) at the tip of the support plate (21L, 21R) A vertically adjustable stopper (22) is provided, the stopper (22) is brought into contact with the upper surface of the mower deck (10), and the center portion of the cutter (9) is plated on the lower end surface of the cutter drive shaft (12p, 12p). The belt drive shaft (11) in the vertical direction is mounted on the gear box (13) provided on the upper surface of the mower deck (10) with bolts (18) through the member (19). The transmission belt (16) is wound between the input pulley (14) fixed to the upper end of the belt drive shaft (11) and the drive pulleys (12, 12) of the left and right cutter drive shafts (12p, 12p). And the left and right cutters (9, 9) are configured to rotate inwardly with the phases thereof being shifted from each other by 90 degrees. The belt drive shaft (11) extends downward and the left and right widths of the overlapping portion (R) An auxiliary cutter (17) having the same rotational diameter as that of the mower deck (10) and cutting the turf grass in front of the center is supported on the belt drive shaft (11) at the same height as the cutter (9, 9), and the mower deck (10 ) Is provided with a shooter (31) that discharges the cut grass to the collector bag (30) at the rear of the vehicle body, and the lower edge of the left and right side plates (40L, 40R) of the shooter (31) is connected to the bottom edge of the shooter (31). Of the bottom plate (32) The bottom plate (32) is supported by a bottom plate opening / closing lever (34) provided on the side of the cockpit. A lawn mower characterized in that it can be switched between a state in which the grass is released directly to the ground by opening and closing and a state in which it is collected in the collector bag (30) .

Images