JP2007124976A - Riding lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding lawn mower having a minimized space for installing a blower for pneumatic transfer of lawn grass and a speed changer. <P>SOLUTION: The lawn mower is provided with a traveling drive system B to transmit the power of an engine 12 to wheels 3, 4 and a blower drive system A to transmit the power of the engine to a mower 6 for lawn mowing and a blower 23 for the pneumatic transfer of the grass mowed by the mower 6. The power is transmitted from one power-distribution pulley 31a through a blower-driving pulley 36 to the input shaft 33 of the blower drive system A placed above a pair of power distribution pulleys 31a, 31b of the output shaft 12a of the engine 12, and the power from the power distribution pulley 31b is transmitted to the input shaft 28 of the traveling drive system B placed under the other power distribution pulley 31b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a riding lawn mower in which a mower that performs ground work such as lawn mowing is mounted below a vehicle body.

Japanese Patent Application Laid-Open No. 63-98313 discloses a so-called front mower type riding lawn mower in which a lawn mower (moor), which is a typical example of a ground working machine, is mounted on the front of a vehicle body. This riding lawn mower collects turf grass mowed by moor on a collector back at the rear of the vehicle body via a shooter and a duct. In addition, a transmission that shifts the power from the engine is used to drive the blower and the vehicle body that are provided to air-carry the turf grass cut to the collector back.
JP 63-98313 A EP0840998 (B1) Publication

In the riding lawn mowers of the inventions described in Patent Documents 1 and 2, the blower and the transmission for transferring turfgrass air are placed at different locations in plan view.
Therefore, the arrangement space of these devices occupies a large specific gravity in plan view.
The subject of this invention is providing the riding lawn mower which made the installation space of the blower for turfgrass air conveyance, and the transmission as small as possible.

The above-mentioned problem of the present invention is solved by the following solution means.
The invention described in claim 1 includes a travel drive system (B) for transmitting power from the engine (12) to drive the wheels (3, 4), a mower (6) for cutting turf grass, In a riding lawn mower equipped with a blower drive system (A) for transmitting power from the engine (12) to a blower (23) for blowing and conveying turf grass cut by the mower (6), the engine (12) A pair of power distribution means (31a, 31b) is provided on the output shaft (12a) of the motor, and one power is applied to the input shaft (33) of the blower drive system (A) provided above the power distribution means (31a, 31b). A blower drive means (36) for transmitting power from the distribution means (31a) is provided, and the power distribution means is provided on the input shaft (28a) of the traveling drive system (B) provided below the other power distribution means (31b). Travel that transmits power from (31b) Is a provided a riding lawn mower motion means (29).

  According to the second aspect of the present invention, the traveling drive system (B) includes an HST (19) including a pair of an HST pump (28) and an HST motor (35), and the HST pump (28) and the HST motor (35) Are supported on the rear surface of a differential case (15) equipped with a differential gear device (3, 3) that is operated by power from the HST motor (35), and these HST (19) and differential case ( 15. The riding lawn mower according to claim 1, wherein a blower (23) is arranged on the upper surface of 15).

  According to a third aspect of the present invention, there is provided a power transmission case (25) in which a power transmission gear mechanism provided in the blower drive system (A) is housed, a rotation shaft (20) of a blower (23), and a blower rotation shaft drive means ( 36. The riding lawn mower according to claim 1 or 2, wherein the input shaft (33) of 36) is supported.

  The invention described in claim 4 is provided with a shooter (27) serving as a conveyance path for blowing and conveying the turf grass cut by the mower (6) by the blower (23), and is further provided with a power transmission provided in the travel drive system (B). The upper part of the case of the power transmission case (15) equipped with the gear mechanism has a front lowering shape, and the front lower part of the upper part of the case of the power transmission case (15) has a shape along the bottom surface of the shooter (27). Item 4. The riding lawn mower according to any one of Items 1 to 3.

  According to the first aspect of the present invention, since the blower drive system (A) and the traveling drive system (B) are arranged vertically, the length of the riding lawn mower can be made shorter than that of the conventional lawn mower.

  According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the HST pump (28) and the HST motor (35) are arranged on the left and right, so that they are bulky in the vertical direction. Moreover, since it is instructed directly on the rear surface of the differential case (15), a space is formed on these upper surfaces, and the blower (23) can be arranged in this space, so that the length of the front and rear of the fuselage can be shortened.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, in addition to the power transmission case (25) equipped with the power transmission gear mechanism of the blower drive system (A), the blower rotating shaft (20 ) And the input shaft (33) of the blower rotating shaft driving means (36) is supported, so that stable rotation of the blower (23) can be obtained.

  According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, the power transmission case (15) including a power transmission gear mechanism provided in the travel drive system (B) is provided. Since the upper part of the case has a front-lowering shape along the bottom surface of the shooter (27), a lawn grass cutting and transporting mechanism for a riding lawn mower with a configuration that is not bulky as a whole can be obtained.

Embodiments of the present invention will be described below with reference to the drawings.
A side view of the riding lawn mower of this embodiment is shown in FIG. In the present invention, the left and right directions in the forward direction of the lawn mower are referred to as the left side and the right side, respectively, the forward direction is referred to as the front side, and the reverse direction is referred to as the rear side.

  The front and rear portions of the traveling vehicle body 2 are provided with front wheels 3, 3 and rear wheels 4, 4, respectively, and a mower 6 for cutting turf grass having a cutter 5 is provided below the front portion of the vehicle body 2. A steering column 8 is erected on the floor 7 above the section, and a handle 10 is provided above the column 8. A cockpit 11 is provided behind the steering wheel 10, a bonnet 34 covering the engine 12 and the radiator 9 is disposed behind the cockpit 11, and a collector 14 is provided above the hood 34.

  As shown in the side view of FIG. 1, the riding lawn mower 1 of the present embodiment has the front end of the front mower 6 for rear wheel steering and the front end of the floor 7 arranged at substantially the same front and rear positions in a side view of the lawn mower. The seating positions of the axle 3a and the operator's cockpit 11 are also arranged at substantially the same front and rear positions in a lawn mower side view.

  If the front end of the floor 7 is too far ahead of the front end of the mower 6, turf grass can be left uncut, and if the front end of the floor 7 is too far behind the front end of the mower 6, it is difficult to align the turf grass. Furthermore, if the front end of the floor 7 and the front end of the mower 6 are substantially in the same front-rear position when viewed from the side of the lawn mower, the distance between the obstacle and the mower 6 can be easily understood when moving forward at the wall, etc. good.

  The mower 6 is pivotally attached to the vehicle body 2 (for example, the front end portion of the side case 32 described later) and the front side can be moved up and down, so that the mower 6 can be raised and lowered.

  A blower case 24 with a blower 23 is disposed in the lower rear part of the cockpit 11, and the blower 23 is operated by the output of the engine 12. A turfgrass transport duct 26 that connects the blower case 24 and the collector 14 is provided above the blower case 24. Further, a shooter 27 that is shaped to rise after side view is disposed between the blower 23 and the mower 6, and the turf grass cut by the mower 6 passes through a discharge port at the rear center of the deck 6 a and has a short cylindrical guide guide portion and The end portion is superposed on the guide portion and is sent to the blower 23 via the shooter 27 provided so as to be able to be bent, and is conveyed to the rear collector 14 via the duct 26. In addition, the wind is generated by the rotation of the cutter 5 of the mower 6 and the mowing grass is conveyed by air in the shooter 27 by the generated wind and the blower wind, and is further conveyed in the duct 26 by the blower wind and reaches the collector 14.

The operation mechanism of the lawn mower provided with the above-described schematic members will be described.
The output shaft 12a of the engine 12 is extended in front of the engine 12, and the power distribution pulley shaft 30 (FIG. 1) is connected to the output shaft 12a via the universal joint 13. The power distribution pulleys 31a and 31b fixed to the power distribution pulley shaft 30 include a pair of pulleys 31a and 31b that distribute power to the blower drive system A and the travel drive system B, respectively. The blower drive system A is the power distribution shaft. A blower drive pulley shaft 33 provided above 30 receives a power from a pulley 31a by a pulley 36 integrated with a blower drive pulley shaft 33 to drive the blower 23, and a traveling drive system B is a hydraulic pressure of an HST 19 provided below the power distribution shaft 30. By driving the HST driving pulley 29 integral with the pump shaft 28a (FIG. 2), the blower 23 and the HST 19 can be arranged vertically.

Further, as described later, since the HST lever 19 is arranged in a relationship in which the hydraulic pump 28 and the hydraulic motor 35 are provided side by side, a space can be formed above the HST lever 19, which is convenient for the arrangement of the blower case 24. As described above, since the blower case 24 and the HST 19 are arranged at positions where they overlap each other in the vertical direction, the guide duct 27 from the mower 6 can be shortened as compared with that of a conventional riding lawn mower.
Note that power transmission may be performed by a chain or gear instead of the pulley group.

  The blower drive system A is transmitted power from the blower drive pulley shaft 33 to the blower rotary shaft 20 by a gear mechanism 25 a provided in a blower transmission case 25 adjacent to the rear of the blower case 24. The blower driving pulley shaft 33 and the blower rotating shaft 20 are supported on both side walls of the blower transmission case 25. Moreover, since the rotating shaft 30 of the power distribution pulleys 31a and 31b is also supported by the blower transmission case 25, the support structure of the power distribution pulleys 31a and 31b is simplified.

  Further, as shown in the plan view of the main part of FIG. 2, the HST 19 has a hydraulic pump 28 and a hydraulic motor 35 arranged in parallel, and the hydraulic motor shaft 35a is used instead of the hydraulic pump shaft (HST input shaft) 28a. The drive shaft of the rear wheel 4 is coaxial with the hydraulic motor shaft 35a of the HST 19. For this reason, the drive system for the rear wheels 4 is simplified, and it is not necessary to use a universal joint at the connecting portion between the rear wheel drive shaft and the hydraulic motor shaft 35a of the HST 19, and a simple power transmission mechanism is obtained.

  In addition, as shown in FIG. 1, a connection surface between the differential case 15 and the HST 19 is disposed below the blower case 24, and an extended line of the boundary line between the differential case 15 and the HST 19 passes through the front and rear intermediate portions of the blower case 24. Yes. For this reason, the HST 19 can be disposed below the blower case 24, and the belt can be easily hung between the power distribution pulley 31b and the HST drive pulley 29.

  In the differential case 15, a bevel gear mechanism 15a (including gears 15a1 to 15a4) and a differential mechanism 15b (including gear 15b1) that are linked to the hydraulic motor shaft 35a from the side close to the HST 19 are disposed in the front and rear. Since the upper surface side of the side wall surface is formed to be an inclined surface, the inclined surface can be along the lower surface of the shooter 27, and the placement of the shooter 27 is facilitated.

  Further, as shown in FIG. 1, a blower 23 is disposed at a substantially middle portion in the vertical direction between the deck 6a of the mower 6 and the outlet 26a of the duct 26 on the collector 14 side in the height direction. Thus, the suction force of the turfgrass cut by the mower 6 of the blower 23 and the discharge force of the turfgrass to the collector 14 can be made substantially the same, so that the turfgrass transfer efficiency of the blower 23 is improved as compared with the prior art, and the blower rotation speed is relatively high. As a result, the noise of the blower 23 can be reduced.

  FIG. 3 shows a perspective view of the turfgrass conveyance section from the mower 6 to the blower case 24, and FIG. 4 shows a front view of the vicinity of the differential case 15. As shown in these drawings, the gear-type traveling device in the differential case 15 includes a front-wheel drive gear transmission mechanism having a three-axis gear transmission configuration (32a to 32c) in a pair of side cases 32 that are integral with the differential case 15. A gear transmission mechanism to the mower drive PTO shaft 38 in the PTO case 37 is provided. As shown in FIG. 3, the central differential case 15 and the left and right side cases 32 constitute a portal case, and the shooter 27 can be disposed below the differential case 15.

  Further, as shown in the front view of the differential case 15 in FIG. 4, the hydraulic pump shaft 28 a of the HST 19 is extended into the PTO case 37 so that power can be input. The rotation of the pump shaft 28a is transmitted to the PTO shaft 38 through the intermediate transmission shaft 39 of the transmission gear group. The PTO shaft 38 is disposed in a space formed between the side case 32 and the shooter 27. Further, the PTO case 37 can be rotated in the direction of arrow A around the shaft 28a by releasing the connection with the differential case 15, and the shaft center is arranged at the center of the machine body. If comprised in this way, it can equip with a working machine (snowblower, etc.) by removing at least the mower 6 and the shooter 27 and can transmit.

  As shown in the rear view of the blower case 24 in FIG. 5, the blower driving pulley 50 and the power distribution pulley 31 a that are coaxial with the rotation shaft 20 of the blower 23 are connected to each rotation shaft (the blower rotation shaft 20 and the power distribution pulley shaft). The belt 52 is used to adjust the tension of the belt 52 by the lining tension pulley 53 and the winding angle securing tension pulley 55 even if the inter-axis distance D1 of 30) is short.

  A rotation shaft 56 a of the swing arm 56 of the lining tension pulley 53 is disposed inside the belt 52, and a swing shaft 57 a of the swing arm 57 of the winding angle securing tension pulley 55 is disposed outside the belt 52. The two swing arms 56 and 57 are connected by a buckle arm 59, and the swing arm 57 of the winding angle securing tension pulley 55 is constantly pulled by a spring 61 supported at one end on the traveling vehicle body 2 with a tensile force. The belt 52 is pressed so that the two pulleys 53 and 55 are tensioned from the inside and the outside of the belt 52 by pulling the swing arm 56 of the lining tension pulley 53 with a wire or the like (not shown). When the pulleys 53 and 55 are pressed by the belt 52, the rotational driving force is transmitted from the power distribution pulley 31a to the driving pulley 50 of the blower 23. Thus, even if the distance between the shafts is short by the lining tension pulley 53 and the winding angle securing tension pulley 55, a belt tension clutch can be configured, and the tension clutch between the two pulleys 53 and 55 can be reliably turned on and off. it can.

  Next, the transmission structure of the mower 6 will be described. A mode in which a pair of left and right cutters 5 are provided and a weed opening is formed at the center of the rear part of the mower 6 that rotates in opposite directions, a shooter 27 is disposed at the center of the machine body, and the blower 23 guides the weeds toward the rear collector 14 The transmission structure to the mower 6 includes a front mower (which is a configuration disclosed in the present specification and configured to input transmission from the rear of the mower), and a mid mower (provided to be raised and lowered on the abdomen of the tractor, and the collector 14 at the rear. And is configured to transmit power from the front side of the mower 6 because the engine 12 is mounted on the front portion.

  Conventionally, the transmission configuration is separately provided for the front mower and the mid mower, but the above configuration is an improved configuration.

  6 to 8 show a transmission form of the front mower 6, and power is transmitted from the PTO shaft 38 to the mower drive shaft 40 via the universal joint 70. A bevel gear 71 is provided at the end of the mower drive shaft 40, and two bevel gears 74 and 75 are provided on the horizontal shaft 76A in a back-to-back manner between the upper end bevel gear 73 of one of the left and right rotary cutter shafts 72. It is configured to be housed in a bevel transmission case 77 and detachably fixed to the mower deck 78.

  The horizontal shaft 76A is provided with an intermediate transmission shaft 76C and couplings 76D and 76D, and is extended to a horizontal shaft 76B of a transmission case 80 that supports the other cutter shaft 79. Inside the case 80, a pair of bevel gears 81, 82 are provided. It is configured to be able to interlock with rotation. As with the bevel transmission case 77, the transmission case 80 is also detachably fixed to the mower deck 78. Cutters 83 and 84 are provided at the lower ends of the left and right rotary cutter shafts 72 and 79, respectively.

  With the configuration as described above, when the rotation in the arrow (A) direction is applied to the mower drive shaft 40, the left and right rotary cutter shafts 72 and 83 are rotated in the arrow (B) direction, and the other rotary cutter shaft is provided. 79 and cutter 84 are given rotation in the direction of the arrow (c).

  On the other hand, FIG. 9 shows a configuration in which a transmission mechanism to the mid mower 70 is incorporated. The transmission mechanism for the mid mower 70 shown in FIG. 9 includes the mower drive shaft 40, the bevel transmission case 77, the horizontal shafts 76A and 76B, the intermediate transmission shaft 76C, the transmission case 80, and the left and right cutter shafts 72 in the front mower 6 of FIG. 79, and the bevel gear group inside each case 77, 80 is removed from the mower deck 78, that is, the left and right transmission cases 77, 80 are removed from the mower deck 78 and used in the mid mower mechanism. ing.

  Note that the front mower 6 of FIG. 6 and the mid mower 70 of FIG. The front mower 6 receives power from the rear PTO shaft 38, while the mid mower 70 is provided with a PTO shaft (motor shaft 35 a) for taking out power at a position lowered from the front engine 12 by belt transmission downward. This is because the left and right relationships of the transmission cases 77 and 80 are reversed.

  In FIG. 9, the PTO shaft 90 of the mid mower 70 is inputted to the mower drive shaft 40 from the front side through the universal joint 91, and is inputted to the bevel transmission case 77a, and the bevel gear 74a is interlocked. The bevel gear 74a is different from the arrangement configuration of the bevel gear 74 in the bevel transmission case 77 in FIG. 6 in the transmission case 77a. 6 is the same as the configuration in FIG. Accordingly, when rotation in the direction of arrow (d) is applied to the motor drive shaft 40, the rotary cutter shaft 72 and cutter 83 rotate in the direction of arrow (e), and the rotary cutter shaft 79 and cutter 84 rotate in the direction of arrow (to). To do.

  The reason why the bevel gear 74a is arranged as shown in FIG. 9 is in the rotational direction of the motor drive shaft 40 on the input side. When the bevel gear 74a is arranged as shown in FIG. 9, the transmission configuration of the front mower 6 shown in FIG. 6 can be used as it is.

  As described above, most of the left and right rotary cutter shafts 72 and 79 can be shared from the mower drive shaft 40, or if the rotations of the PTO shaft 38 and the PTO shaft 90 coincide with each other, they can be shared completely and the cost is reduced. Can be planned.

  Also, as shown in FIGS. 6 to 8, by arranging the two bevel gears 74 and 75, the thrust forces acting on the bevel gears 74 and 75 are offset in opposite directions, and an unreasonable burden on the bearing is caused. This contributes to a longer life of the bearing 95. That is, a thrust force in the right direction of the paper is generated in the bevel gear 74 that is interlocked with the rotation from the mower drive shaft 40 side, while the bevel gear 75 is moved in the left direction of the paper as the rotary cutter shaft 72 of the mower 6 is driven. Since the thrust force acts, these thrust forces cancel each other, reducing an unreasonable burden on the bearing 95 located in the middle.

  The present invention is highly useful as a domestic lawn mower for industrial use.

It is a principal part side view of the riding lawn mower of the Example of this invention. It is a principal part top view of the riding lawn mower of the Example of this invention. It is a perspective view which shows the structure between the mower and blower case of the riding lawn mower of FIG. It is a schematic front view of the differential case part of the riding lawn mower of FIG. It is a rear view of the blower case part which shows the drive system of the blower of the riding lawn mower of the other Example of this invention. It is a top view which shows an example of the transmission structure of the front mower of the riding lawn mower of the Example of this invention. It is the top view to which a part of transmission structure of FIG. 6 was expanded. It is the rear view which expanded a part of transmission structure of FIG. It is a top view which shows an example of the transmission structure of the midmoor of the riding lawn mower of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Riding lawn mower 2 Car body 3 Front wheel 3a Front wheel axle 4 Rear wheel 5 Cutter 6 Moore 6a Deck 7 Floor 8 Steering column 9 Radiator 10 Handle 11 Pilot seat 12 Engine 12a Engine output shaft 13 Universal joint 14 Collector 15 Differential case 15a Bevel gear mechanism 15a1 -15a4, 15b1 Gear 15b Differential mechanism 19 HST
20 Blower Rotating Shaft 23 Blower 24 Blower Case 25 Blower Transmission Case 25a Gear Mechanism 26 Duct 26a Duct Outlet 27 Shuter 28 Hydraulic Pump 28a Hydraulic Pump Shaft 29 HST Drive Pulley 30 Power Distribution Pulley Shafts 31a, 31b Power Distribution Pulley 32 Side Case 32a ˜32c Three-shaft gear transmission configuration 33 Blower drive pulley shaft 34 Bonnet 35 Hydraulic motor 35a Hydraulic motor shaft 36 Pulley 37 PTO case 38 Motor drive PTO shaft 39 Intermediate drive shaft 40 Motor drive shaft 50 Blower drive pulley 52 Belt 53 Inner tension Pulley 55 Winding angle securing tension pulleys 56, 57 Swing arm 56a, 57a Swing arm rotation shaft 59 Buckle arm 61 Spring 70 Midmower 71 Bevel gear 72, 79 Cutter shaft 73, 7 , 74a, 75 Bevel gears 76A, 76B Horizontal shaft 76C, 76D Intermediate transmission shaft 77, 77a Bevel transmission case 78 Moore deck 80 Transmission case 81, 82 Bevel gear 83, 84 Cutter 90 PTO shaft 91 Universal joint 95 Bearing A Blower drive system B Travel drive system

Claims (4)

To drive the wheels (3, 4), a driving system (B) for transmitting power from the engine (12), a mower (6) for mowing turf grass, and after mowing with the mower (6) A lawn mower equipped with a blower drive system (A) for transmitting power from an engine (12) to a blower (23) for blowing and conveying
A pair of power distribution means (31a, 31b) is provided on the output shaft (12a) of the engine (12), and the input shaft (33) of the blower drive system (A) provided above the power distribution means (31a, 31b). Is provided with a blower drive means (36) for transmitting power from one power distribution means (31a) to an input shaft (28a) of a travel drive system (B) provided below the other power distribution means (31b). A riding lawn mower characterized by comprising travel drive means (29) for transmitting power from the power distribution means (31b).   The travel drive system (B) includes an HST (19) including a pair of an HST pump (28) and an HST motor (35), and the HST pump (28) and the HST motor (35) are provided side by side on the HST. The wheel (3, 3) operated by the power from the motor (35) is supported on the rear surface of the differential case (15) equipped with a differential gear device, and a blower (on the upper surface of these HST (19) and differential case (15)) 23) The riding lawn mower according to claim 1, wherein 23) is arranged.   A power transmission case (25) equipped with a power transmission gear mechanism provided in the blower drive system (A) has a rotation shaft (20) of the blower (23) and an input shaft (33) of the blower rotation shaft drive means (36). The riding lawn mower according to claim 1 or 2, wherein A shooter (27) serving as a conveyance path for blowing and conveying the turf grass cut by the mower (6) by the blower (23) is provided.
Furthermore, the upper part of the case of the power transmission case (15) equipped with a power transmission gear mechanism provided in the travel drive system (B) is formed in a front-lowering shape,
The riding lawn mower according to any one of claims 1 to 3, wherein the front lowering shape of the upper portion of the power transmission case (15) is a shape along the bottom surface of the shooter (27).

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