JP2018068210A - Sulky lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cleaning maintenance frequency of an intake filter by devising the arrangement of the intake filter for purifying intake air to an engine in a sulky lawn mower in which a large quantity of dust is generated.SOLUTION: A sulky lawn mower in which an engine 13 is mounted in the rear part of a vehicle body frame 12, and lawn mowed by a mower 1 installed in the front part of the vehicle body frame 12 is sucked with a blower 2, sent to a collector 3 in the rear part of a driver seat 4, and accumulated there is provided with a pre-filter 75 for subjecting intake air to an intake filter 74 of the engine 13 to primary purification, on a guard pillar 26 erected between the driver seat 4 and the collector 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a riding lawn mower that cuts and collects lawn in a garden or golf course.

  For example, in the configuration described in Patent Document 1, the riding lawn mower includes a mower unit that can be moved up and down on the front side of a traveling vehicle body that runs on an engine mounted on the rear portion.

JP 2014-15168 A

  Riding lawn mowers cut the lawn that grows low on the ground with the rotating blades of the mower unit, so there is a lot of dust generated with the lawn, and the air intake filter that cleans the intake air of the engine must be cleaned frequently. Don't be.

  An object of the present invention is to reduce the frequency of cleaning maintenance of an intake filter by devising the arrangement of an intake filter that purifies intake air to the engine in a riding lawn mower that generates a lot of dust.

  The above conventional problem is solved by the following technical means.

  According to the first aspect of the present invention, the engine 13 is mounted on the rear part of the vehicle body frame 12, and the lawn cut by the mower 1 mounted on the front part of the vehicle body frame 12 is sucked by the blower 2 to the collector 3 at the rear part of the driver's seat 4. In a riding lawn mower that feeds and accumulates, a riding lawn mower characterized in that a pre-filter 75 that primarily purifies the intake air to the intake filter 74 of the engine 13 is provided on the guard column 26 that stands between the driver's seat 4 and the collector 3. A machine.

  The invention according to claim 2 is the riding lawn mower according to claim 1, characterized in that a plurality of surrounding rods 76a and 76b surrounding the outer side of the prefilter 75 in a non-contact state on an arc are provided.

  The invention described in claim 3 is characterized in that the plurality of surrounding rods 76a and 76b are formed so as to cover the outer side of the pre-filter 75 in a substantially half-circumference, and the front ends thereof are covered with a cover plate 76c. A lawn mower for riding.

  According to the first aspect of the present invention, the lawn cut by the mower 1 is sucked by the blower 2, sent to the collector 3, and accumulated. There is almost no dust drifting around the guard column 26 erected on the rear side, and the pre-filter 75 provided there performs primary purification of the intake air and sends it to the engine 13 from the intake filter 74, so that the dust accumulated in the pre-filter 75 There is little dust and the cleaning timing of the pre-filter 75 can be lengthened.

  In the invention according to claim 2, since the outside of the pre-filter 75 is covered with the surrounding fences 76a and 76b that do not prevent the outside air from being sucked, the pre-filter 75 is directly contacted with an obstacle such as a tree leaf and breaks. If the surrounding fences 76a and 76b are made of an elastic material without being restored, they will be restored even if they come into contact.

  In the invention according to claim 3, the plurality of surrounding fences 76 a and 76 b prevent an obstacle from coming into contact with the pre-filter 75 from the outside, and the distal ends of the surrounding fences 76 a and 76 b are covered with a cover plate 76 c. Thus, the rigidity of the surrounding saddles 76a and 76b is increased, and the covering plate 76c is prevented from damaging the human body at the tips of the surrounding saddles 76a and 76b.

The whole side view of a riding lawn mower. The whole top view which abbreviate | omitted one part of the riding lawn mower. The whole back view of a riding lawn mower. The cutting top view of an engine and a transmission case part. The top view of a right-and-left rear wheel part. The cut side view of a rear-wheel part. The side view at the time of the collector raise of a riding lawn mower. Travel hydraulic circuit diagram. The top view of a pre filter attachment part. Side view of pre-filter mounting section

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. In the description of the embodiment, the left and right directions in the forward direction of the aircraft are referred to as left and right, respectively, the forward direction is referred to as forward, and the backward direction is referred to as rear. However, the configuration of the present invention is not limited.

  The configuration and operation of the riding lawn mower will be described.

  The riding lawn mower according to the present embodiment includes a mower 1 that is connected to the front lower part of the vehicle main body so as to be raised and lowered, and a blower 2 that sucks and conveys the turf grass cut to the rear side, and a rear side. And a collector 3 for storing turfgrass cut into the ground.

  A driver's seat 4 is provided on the front side of the vehicle body. The steering wheel 5 on the front side of the driver's seat 4 is provided with a steering handle 6 for steering operation and an operation panel 7. In step 8, a forward pedal 9f, a reverse pedal 9r, a brake pedal 10 and the like are provided. It has been.

  The vehicle body frame 12 that supports the driver's seat 4, the handle post 5, the step 8 and the like includes a rear engine 13, a transmission case 14 integrally connected to the front side of the engine 13, and a front side from the transmission case 14. The front frame portion 15 integrally connected so as to extend and the rear frame portion 16 integrally connected so as to extend rearward from the engine 13 are connected to each other. That is, by connecting the rear side portions of the pair of left and right front frame portions 15 and 15 to the left and right side surfaces of the transmission case 14 and mounting the engine 13 directly on the rear side portions of the transmission case 14 via spacers, The vehicle body frame 12 is configured by rigidly connecting four members.

  A front axle 17 is mounted on the left and right front frame portions 15 and 15, and left and right front wheels 18 and 18 are provided on the left and right sides of the front axle 17 via left and right hydraulic motors Mf and Mf.

  The left and right rear frame portions 16 and 16 are configured to be slightly narrower in the vertical direction than the left and right front frame portions 15 and 15 and are configured to bend so that the rear half is higher than the front half in a side view. Left and right rear axles 20 and 20 are mounted on the frame parts 16 and 16 via a pivot shaft 19 in the vertical direction so as to be freely steerable. Left and right rear wheels 21 and 21 are disposed on the left and right sides of the left and right rear axles 20 and 20 via left and right hydraulic motors Mr and Mr, respectively.

  A hydraulic pump unit P that supplies and discharges hydraulic pressure to the left and right hydraulic motors Mf, Mf, Mr, and Mr that respectively drive the left and right front wheels 18 and 18 and the left and right rear wheels 21 and 21 is provided behind the engine 13 as will be described later. ing.

  As shown in FIG. 4, engine power is input to the transmission case 14 through the front side portion of the crankshaft 22 to the rear side portion, and the first transmission output shaft 23 at the left and right center and the second transmission output near the left and right sides. It is transmitted to the shaft 24. Among these, the power is transmitted from the first transmission output shaft 23 to the blower 2, and the power is transmitted from the second transmission output shaft 24 to the mower 1.

  The mower 1 and the blower case 2a that accommodates the blower 2 are communicated by the front side portion of the transport chute 25 that transports the cut grass, and the rear end of the transport chute 25 faces the front opening of the collector 3. ing.

  Left and right guard posts 26 are erected on the left and right sides between the driver's seat 4 and the collector 3 on the vehicle body frame 12. As shown in FIG. 7, the front end of a lifting / lowering link mechanism 27 for lifting and lowering the collector 3 is pin-connected to the left and right guard columns 26, 26. The upper end base of the shaft is pivotally connected. The lower end portion of the frame frame member 28 is pivotally supported by a fulcrum support shaft 29 that penetrates the rear lower portion of the collector 3 in the left-right direction so as to be capable of dumping rotation, and the lift link mechanism 27, the frame frame member 28, They are connected by a telescopic dump cylinder mechanism 31.

  The lower part of the left and right guard columns 26, 26 and the lower end of the rearwardly inclined lifting link mechanism 27 are pin-connected by the lifting cylinder 30, and the upper end of the lifting link mechanism 27 is pin-connected to the front lower part of the dump cylinder mechanism 31, The collector 3 is moved up by the lifting operation of the lifting link mechanism 27 by the extension of the lifting cylinder 30, and the collector 3 is moved down by the contraction operation of the lifting cylinder 30. Further, the collector 3 is dumped by the extension operation of the dump cylinder mechanism 31, the collector door 3 a is opened and rotated by its own weight, the turf grass is discharged backward, and the dump return operation is performed by the shrinking operation.

  Further, a pre-filter 75 shown in FIGS. 9 and 10 is attached to the upper and lower intermediate positions of the left guard column 26. A mounting bracket 77 provided with a filter cylinder 78 on which the prefilter 75 is placed is attached to the side surface of the left guard column 26 with bolts 80.

  Enclosures 76a and 76b surrounding the outer side surface of the prefilter 75 in a semicircular shape in a non-contact manner are welded to the mounting bracket 77 in two upper and lower stages. The front ends of the surrounding saddles 76a and 76b are integrally wrapped with a cover plate 76c so that they will not be damaged even if they come into contact with the human body. The corners of the cover plate 76c are chamfered so that clothes of the work vehicle are not caught.

  The semi-circular enclosure rods 76a and 76b are not easily bent and damaged even when an obstacle hits the outside, but they may be three or four stages up and down, and the prefilter 75 may be enclosed in an annular shape. good.

  Further, the right filter support 26 may be attached to the prefilter 75, and the height of the attachment may be a position where there is little dust and does not interfere with the maneuvering operation of the trader sitting on the driver's seat 4.

  A pre-filter 75 is detachably mounted on the filter cylinder 78, and an air hose 79 connected to the filter 74 to the engine 13 is connected to the bottom of the filter cylinder 78.

  As shown in FIG. 6, power from the rear end of the crankshaft 22 of the engine 13 is transmitted to the hydraulic pump unit P through an output pulley 33, a transmission belt 34, an input pulley 35, and a pump input shaft 36. The hydraulic pump unit P is configured to supply a predetermined hydraulic pressure by driving a built-in main piston pump and charge pump (both not shown) upon receiving power transmission. This hydraulic pressure is supplied to the left and right hydraulic motors Mf, Mf, Mr, and Mr, and has a known configuration for driving the left and right front wheels 18 and 18 and the left and right rear wheels 21 and 21, respectively.

  The rear side portions of the left and right rear frame portions 16, 16 among the components of the vehicle body frame 12 are connected by a first plate 40 extending in the left-right direction and in the vertical direction. Bolts are fastened to the front side surface, and disposed behind the engine 13 so as to confront each other through a space.

  The pump input shaft 36 is supported on the mounting side of the engine 13 above the first plate 40, the input pulley 35 is mounted on the front end of the pump input shaft 36, and the hydraulic pump is mounted on the rear side of the pump input shaft 36. The rotation input part of the unit P is detachably attached.

  A transmission belt 34 is stretched between the output pulley 33 and the input pulley 35 of the crankshaft 22 of the engine 13 along the vertical direction, and the rotation of the output pulley 33 passes through the input pulley 35 and the hydraulic pump unit P. It is transmitted to the pump part.

  The input pulley 35 and the pump input shaft 36 are disposed on the front side of the first plate 40, and the hydraulic pump unit P main body is mounted on the rear side. Further, the output pulley 33 and the input pulley 35 of the crankshaft 22 Are stacked one above the other in a plan view, the mounting structure of the hydraulic pump unit P disposed behind the engine 13 is simplified and made compact, and the overall length of the machine body is shortened.

  Further, the output pulley 33 of the crankshaft 22 is provided with a single belt-engaging pulley portion 37 so as to drive a generator 38 mounted on the rear side surface of the engine 13.

  The front end portion of the support member of the pivot shaft 19 is supported on the lower side portion of the first plate 40 that extends downward from the shaft support portion of the pump input shaft 36 so that the pivot shaft 19 approaches the engine 13 side. It is easy to arrange and compact.

  The rear end portion of the support member of the pivot shaft 19 is connected by the second plate 41 in the left and right direction and the vertical direction, and the upper portion of the first plate 40 and the second plate 41 is connected and reinforced by the reinforcing plate 39. . A support member for the pivot shaft 19 is swingably supported around a longitudinal axis, and a rear axle 20 that supports the left and right rear wheels 21 and 21 is swingably supported on the pivot shaft 19.

  As shown in FIG. 5, the upper surface of the hydraulic pump unit P is provided with a trunnion shaft 42 having a vertical axis, and the discharge oil amount and the discharge port are selected based on the forward and reverse rotation of the trunnion shaft 42 and the rotation amount thereof. In addition, the flow rate and direction to the hydraulic motors Mr and Mr are controlled so that the traveling speed and the forward / reverse travel can be selected.

  A trunnion arm 43 is provided at the upper end of the trunnion shaft 42 and is disposed on the step 8 via a neutral return mechanism N provided at a position deviated to one side (left side in the figure) of the hydraulic pump unit P. It is linked to the forward / reverse pedals 9f and 9r.

  More specifically, the trunnion arm 43 and the pin at the front top of the triangular plate 44 of the neutral return mechanism N are pin-connected by the interlocking rod 45. The triangular plate 44 is provided so as to be rotatable about a fulcrum shaft 46 at the center of the longitudinal axis of the rear base, and a torque spring 47 is wound around the fulcrum shaft 46 and supported on a base plate 48 as appropriate. The front end of the torque spring 47 is configured to engage the pin at the top of the triangular plate 44 in a squeezed manner, and the neutral return mechanism N is configured by the support and interlocking configuration of the triangular plate 44, the torque spring 47, and the like. Has been.

  When the pin connection point of the interlocking rod 45 moves left and right by turning left and right around the fulcrum shaft 46, the spring force of the torque spring 47 is accumulated, and when the left and right turning state is subsequently released, the displacement state of the torque spring 47 So that the trunnion arm 43 is returned to the neutral position (adjusted to the neutral return position in advance).

  The interlocking wires 49f and 49r are connected to the left and right ends of the rear base of the triangular plate 44, respectively, and the other ends of these interlocking wires 49f and 49r are connected to the forward pedal 9f and the reverse pedal 9r disposed on the step 8. doing.

  When the forward pedal 9f is depressed, the triangular plate 44 rotates counterclockwise around the fulcrum shaft 46, pulls the interlocking rod 45, rotates the trunnion arm 43 counterclockwise, and moves the trunnion shaft 42 to the positive rotation side. Rotate. When the depression of the forward pedal 9f is released, the triangular plate 44 returns to neutral by the action of the torque spring 47 of the neutral return mechanism N, and the trunnion arm 43 and trunnion shaft 42 also return to neutral. Further, when the reverse pedal 9r is depressed, the triangular plate 44 is rotated clockwise, and the trunnion arm 43 and the trunnion shaft 42 are similarly rotated clockwise.

  By arranging the mechanism for connecting to the trunnion shaft 42 and the neutral return mechanism N on the upper surface of the hydraulic pump unit P and in the vicinity thereof, maintenance work can be facilitated from the upper side of the machine body.

  The neutral position adjustment is performed by adjusting the operating length of the interlocking rod 45 and the holding position of the outer wire of the interlocking wires 49f and 49r. Further, the speed regulation adjustment can be performed by adjusting the rotation angle of the triangular plate 44 by forward and reverse rotation of the two left and right adjustment bolts 50 and 50 supported on the base plate 48 as shown in FIG.

  As shown in FIGS. 5 and 6, a hood 51 is provided to cover the upper surface, upper left and right side surfaces, and rear side surface of the engine 13 and the hydraulic pump unit P. For example, the hood 51 has a configuration in which the rear upper part is pivoted upward with the front upper part as a fulcrum, and can be held in an open state, and an action of a stopper (not shown) provided as appropriate when the hood 51 is rotated back to the closed state. It is set as the structure locked by the predetermined position.

  When the hood 51 is pivoted to open, the collector 3 is raised as shown in FIG. 7, the handle 51a on the rear side of the hood 51 is lifted, and can be pivoted upward to the front fulcrum as desired.

  In addition, a damper (not shown) is provided between the hood 51 and the body frame 12 so that the open posture of the hood 51 can be maintained. In this open state, the operator can perform correction adjustment and maintenance around the hydraulic pump unit P from the rear side of the engine 13 by turning behind the machine body.

  As shown in FIGS. 6 and 7, a U-shaped intermediate frame 52 in plan view is provided at a position corresponding to the upper surface of the closed hood 51 to reinforce the hood 51. The intermediate frame 52 protects the engine 13 and also protects auxiliary equipments around the engine 13 and a traveling system oil passage.

  5 and 6, a gear pump chamber 55 is disposed on the rear side of the hydraulic pump unit P, and the gear pump chamber 55 is driven in the front-rear direction driven by the rotational power from the pump input shaft 36 of the hydraulic pump unit P. The pump shaft 56 is provided, and small-diameter gear pumps 55 a and 55 b are provided on both front and rear sides of the pump shaft 56. One gear pump 55a supplies hydraulic pressure to, for example, a hydraulic PTO clutch 24a (shown in FIG. 4) interposed in the transmission path to the mower 1, a hydraulic blower clutch 23a (shown in FIG. 4) interposed in the transmission path to the blower 2, and the like. Supply and discharge.

  The other gear pump 55 b supplies and discharges pressure oil to and from the steering hydraulic cylinder mechanism 57, the mower lifting hydraulic cylinder mechanism 58, the collector lifting lift cylinder 30, and the dump cylinder mechanism 31.

  Note that the oil passages in the hydraulic pump unit P and the oil passages of the gear pumps 55a and 55b in the gear pump chamber 55 are cut off so that the hydraulic oil does not flow between them, and hydraulic oils having different viscosities are used. .

  As shown in FIG. 5, an exhaust pipe 59a of a muffler 59 of the engine 13 is disposed in a downwardly inclined manner on the left and right sides of the hydraulic pump unit P on the opposite side to the neutral return mechanism N.

  As shown in FIGS. 5 and 6, the rear upper surface of the hood 51 is configured as an inclined surface 51b that is rearwardly lowered, and the rear left and right side surfaces are configured as inclined surfaces 51c that are narrowed in the left and right width toward the rear side. ing.

  As shown in FIG. 7, in the state where the collector 3 is raised upward by the lifting link mechanism 27, the inclined surface 51 b and the inclined surface 51 c of the hood 51 are located below the rear upward inclined link of the lifting link mechanism 27. The upper rotation angle of the hood 51 can be greatly opened and rotated while making them approach. Therefore, the hood 51 is pivoted upward and opened to widen the space on the rear side of the hood 51 and the space on both the left and right sides so that the operator can easily approach the engine 13 and the hydraulic pump unit P and perform maintenance work easily. Can be.

  The left and right rear wheels 21 and 21 and the left and right hydraulic motors Mr and Mr for driving use the left and right steering of the rear axle 20 via steering support members such as left and right king pins 60 and 60 for steering rotation as shown in FIG. It is provided freely. The steering hydraulic cylinder mechanism 57 is interposed inside the left and right tie rods 61 and 61 that connect the steering support members of the left and right hydraulic motors Mr and Mr to the left and right sides, and the left and right telescopic rods of the steering cylinder mechanism 57 are connected to the left and right rear wheels 21. , 21 are connected to the left and right tie rods 61, 61, and the steering cylinder mechanism 57 is linked to slide left and right based on the left / right turning operation of the steering handle 6 so that the left and right rear wheels 21, 21 can be steered.

  As shown in FIG. 2, in the mower deck 1a of the mower 1, two blades are rotatably supported around the vertical axis, and the left vertical axis passes from the transmission case 14 to the second transmission output shaft 24. The harvesting power is transmitted, and at the same time, the harvesting power is branched and transmitted to the vertical axis on the other side.

  As shown in FIGS. 1 and 2, the mower deck 1a is configured to be connected to front side portions of elevating links 65 and 65 that are attached to the left and right front frame portions 15 and 15 so as to be movable up and down so that the mower deck 1a can be turned up and down. Can be changed between a grounding work posture and a non-grounding posture.

  The mower elevating hydraulic cylinder mechanism 58 is provided between the action arm portion 65a of the elevating links 65 and 65 and the body frame portion, and the mower deck 1a is moved up and down by the expansion and contraction operation of the mower elevating hydraulic cylinder mechanism 58. Yes.

  Left and right front frame portions 15 and 15 are attached with left and right V-shaped frame portions 66 and 66, respectively, which are rigidly formed of a front curved frame portion and a vertical frame portion (shown in FIG. 1). 66 and 66 are connected by a horizontal frame portion 67 in the left and right direction to form support bases 68 and 68, and the base portions of the left and right guard support posts 26 and 26 are firmly supported.

  The open / close support shaft (not shown) along the left-right direction of the hood 51 is supported via the horizontal frame portion 67 or a bracket extending from the horizontal frame portion 67, and the collector 3 is in an ascending posture. As a condition, the rear side portion of the hood 51 can be opened and rotated largely upward.

  As shown in FIGS. 5 and 6, the rear end portions of the left and right rear frame portions 16 and 16 are connected and rigidized by a horizontal frame portion 70 that is longer to the left and right than these left and right spacing portions. The horizontal frame portion 70 is configured to receive the rear lower end portion of the hood 51 and is configured to receive the descending load of the collector 3.

DESCRIPTION OF SYMBOLS 1 More 2 Blower 3 Collector 4 Driver's seat 12 Body frame 13 Engine 26 Guard column 75 Prefilter 76a, 76b Elastic enclosure 76c Cover plate

Claims (3)

The engine (13) is mounted on the rear part of the vehicle body frame (12), and the lawn to be mowed by the mower (1) mounted on the front part of the vehicle body frame (12) is sucked by the blower (2) and the rear part of the driver's seat (4) In the riding lawn mower that is fed to the collector (3)
A guard post (26) standing between the driver's seat (4) and the collector (3) is provided with a pre-filter (75) for primarily purifying intake air to the intake filter (74) of the engine (13). A lawn mower for riding.   The riding lawn mower according to claim 1, wherein a plurality of surrounding fences (76a), (76b) are provided surrounding the outer side of the prefilter (75) in a non-contact state on an arc. The plurality of surrounding jars (76a), (76b) are configured to cover the outer side of the pre-filter (75) in a substantially half-circumference and have their tips wrapped with a cover plate (76c). Riding lawn mower.

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