JP2008154547A - Riding-type lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding-type lawn mower preventing mowed grass from choking a transportation passage by the difference of timing of starting and stopping of a front mower and a blower. <P>SOLUTION: The riding-type lawn mower is equipped with the blower 17 for transporting the grass mowed by the mower 6 arranged at the front side of a machine body 2 to a collector 16, a power-transmitting mechanism A (A1 and A2) for driving the mower through a mechanism for transmitting the power to the blower 17, and a clutch 36 for driving the mower, for turning on or off the transmitting mechanism A2 for driving the mower 6, and installed in the downstream side of a clutch 27 for driving the blower, for turning on or off the transmitting mechanism A1 to the blower 17. When the clutch 27 for driving the blower is turned off, the power transmission to the mower 6 is also turned off to prevent the passage for air transportation from being choked by the grass mowed by the mower 6 by causing malfunction of stopping the blower 17 regardless of the driving of the mower 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a riding lawn mower equipped with a mower that performs ground work such as lawn mowing on the lower abdomen of the fuselage.

The riding lawn mower collects grass cut by the lawn mower (Moor) through a shooter and a duct and collects it on a collector at the rear of the aircraft. In addition, a blower provided for conveying the grass cut to the collector by air and a power transmission device for transmitting power from the engine for driving the mower and for running the machine body are used.
A so-called front mower type riding lawn mower having a lawn mower mounted on the front of the body is disclosed in EP 0,840,998 (B1) and the like. These prior arts include a transmission mechanism from the engine located at the rear of the fuselage to the transmission case and blower.
EP0,840,998 (B1) Patent Publication

  In the riding lawn mower of the invention described in Patent Document 1, power is transmitted from the engine to the blower arranged behind the transmission case and the front mower arranged at the front end of the riding lawn mower. ing. The riding lawn mower has a configuration in which mowing is performed by a front mower, and the cut grass is sent to a collector attached to the rear of the machine body by a blower conveying force by a blower.

  However, the riding lawn mower according to the invention described in Patent Document 1 has a configuration in which the operation of the front mower and the operation of the blower are performed separately and independently, and in some cases even when the operation of the blower is stopped, There are cases where the front mower is still operating, and at this time, the grass cut by the front mower may become clogged with the blower portion where the operation is stopped.

  The subject of this invention is providing the riding lawn mower provided with the front mower which can prevent the clogging in the conveyance path | route of the cut grass which generate | occur | produces by the shift | offset | difference of the operation | movement of a front mower and a blower, and its stop. .

The above-mentioned problem of the present invention is solved by the following means.
The invention described in claim 1 includes a fuselage (2), a mower (6) for cutting grass arranged forward in the forward direction of the fuselage (2), and grass after cutting by the mower (6). In the riding lawn mower provided with the blower (17) for blowing and conveying the air to the collector (16), the power transmission mechanism (A1) to the blower (17) and the mower (via the power transmission mechanism (A1)) 6) A power transmission mechanism (A) composed of a power transmission mechanism (A2) for driving the power transmission mechanism (A2) is provided, and the power transmission mechanism (A) is for blower driving for turning on and off the transmission mechanism (A1) to the blower (17). It is a riding lawn mower provided with a clutch (27) and a mower driving clutch (36) for turning on and off a transmission mechanism (A2) for driving the mower (6) on the downstream side.

  According to the second aspect of the present invention, the blower driving clutch (27) and the mower driving clutch (36) can be turned on and off by operating a single switch (65). When the switch (65) is turned on, the blower drive is performed. Clutch (27) enters first, then the mower drive clutch (36) engages, and when the switch (65) is turned off, the mower drive clutch (36) is disengaged first, and then the blower drive clutch (27) The riding lawn mower according to claim 1, further comprising a control device (63) for providing a time lag so as to be cut.

  According to the third aspect of the present invention, the collector (16) is provided with an open / close detection sensor (66) for the door (16a) provided in the collector (16), and the control is performed when the door (16a) of the collector (16) is opened. 3. The riding lawn mower according to claim 2, wherein the device (63) has a configuration in which the blower driving clutch (27) and the mower driving clutch (36) are disconnected substantially simultaneously.

  According to the fourth aspect of the present invention, the rotation shaft (32) for driving the blower is shared with the general-purpose PTO shaft, the PTO mode changeover switch (67) is provided, and the rotation shaft (32) for driving the blower is used as the general-purpose PTO shaft. The control device (63) according to any one of claims 1 to 3, wherein the control device (63) is configured to control so that the blower drive clutch (27) is engaged and the mower drive clutch (36) is disengaged. It is a riding lawn mower.

  According to the first aspect of the present invention, when the blower driving clutch (27) is disengaged, the power transmission to the mower (6) is also cut off, so that the blower ( There is no possibility that the malfunction of 17) will stop and clogging will occur in the passage through which the grass cut by the mower (6) blows and conveys to the collector (16).

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, when the blower (17) is operating when the switch (65) is turned off, the blower (17) is clogged in the passage for carrying air. Can be prevented. Further, when the switch (65) is turned on, a time lag is set so that the blower driving clutch (27) enters first, and then the mower driving clutch (36), so that a sudden drop in engine rotation can be prevented.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, the door (16a) of the collector (16) with the blower drive clutch (27) and the mower drive clutch (36) kept on. If the open / close detection sensor (66) detects that the door (16a) of the collector (16) has been opened to prevent this, grass in the collector (16) will spill outside. (17) and mower (6) are deactivated simultaneously to ensure safety.

  According to the invention of claim 4, in addition to the effect of the invention of any one of claims 1 to 3, the mower (6) is not required when the rotary shaft (32) for driving the blower is used as a general-purpose PTO shaft. Therefore, the motor drive clutch (36) can be prevented from being lost due to the control for turning it off.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a left side view of the main part of the riding lawn mower of the present embodiment, FIG. 2 shows a front sectional view of the riding lawn mower of the present embodiment, and FIG. 3 shows a plan view of the mower and the front wheel drive unit. 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.

A front wheel 3 and rear wheels 4, 4 are provided at the front and rear of the traveling machine body 2, respectively, and a mower 6 having a cutter 5 that rotates about a vertical axis is provided below the front part of the machine body 2.
A steering column 8 is erected on the floor 7 above the front of the machine body 2, and a handle 10 is provided on the top of the column 8. A cockpit 11 is provided behind the handle 10, a bonnet 14 covering the engine 12 and the like is disposed behind the cockpit 11, and a collector 16 is provided above the hood 14.

  Although the illustration of the mower 6 is omitted with respect to the airframe 2, the front and rear links constitute a parallel link so that it can be moved up and down. Then, by removing the rear link and fixing the front link to the airframe, the rear side of the mower 6 becomes free at the front fulcrum. At this time, the rear end of the mower 6 is moved back slowly. Becomes a state of being held on the ground, the front side is lifted up, so-called flip-up state, and preparation work for the inspection of the mower 6 can be efficiently and easily performed.

An operation mechanism and the like of the mower (lawn mower) 6 having the above-described schematic components will be described including a side view showing the power transmission mechanism of FIG.
The output shaft 12a of the engine 12 is extended to the front of the engine 12, and the power is transmitted to the mission input shaft 25 for transmitting power from the output shaft 12a to the power transmission mechanism in the mission case 24 via the universal joint shaft 15. The The engine power transmitted to the input shaft 25 provided in the transmission case 24 is distributed to the blower / mower drive system A and the travel drive system B of the power transmission mechanism.

  The blower / mower drive system A is provided on a rotary shaft 25b integral with the input shaft 25 via a coupling 25a. The blower drive clutch 27 turns on / off engine power to the blower / mower drive system A. The clutch output shaft 27a interlocked with the engagement of the clutch 27, the clutch output gear 28 that sequentially transmits power integrally with the clutch output shaft 27a, the intermediate transmission gear 29, the input gear 31, and the input gear 31 are provided on the shaft. The motor drive clutch 36 for turning on and off the power transmitted through the blower drive system A1 comprising the combination of the blower drive shaft 32, the input gear 31, the counter gear 33 and the gear 34 in sequence, and the power from the clutch 36 A mower drive system A2 including a mower PTO shaft 37 to be driven is provided.

  In FIG. 4, the mower drive clutch 36 is described as being disposed below the transmission case 24 or the blower case 18, but this drawing is a developed view, and actually, as shown in FIG. 2. The mower PTO shaft 37 is disposed on the left side of the blower case 18.

  The traveling drive system B includes a counter gear 41 to which power from a traveling gear 40 fixed to the input shaft 25 is transmitted, an input gear 42 of a hydrostatic continuously variable transmission that meshes with the counter gear 41, It consists of a pump drive shaft 43 to which an input gear 42 is fixed.

  Further, a hydrostatic continuously variable transmission is disposed below the input shaft 25, a hydraulic pump 45 driven by the pump drive shaft 43, a hydraulic motor 46 driven by hydraulic power from the hydraulic pump 45, and an output of the hydraulic motor 46 A reduction mechanism 50 including a shaft (hydraulic motor shaft) 47, a bevel gear 50a meshing with a drive pinion 49 on the output shaft 47, an intermediate gear 50b, a differential gear 51a meshing with the intermediate gear 50b of the reduction mechanism 50, an unillustrated pinion gear, and the like Power is transmitted to a differential mechanism 51 having

  Further, the power from the projecting shaft portion of the output shaft 52 of the differential mechanism 51 projecting from the transmission case 24 to the left and right exteriors is connected to the sprockets 52L and 52R provided in the front wheel transmission cases 23L and 23R shown in FIGS. The left and right front wheels 3L and 3R are rotated via the left and right final cases 64L and 64R (FIG. 3), respectively.

  The transmission case 24 and the left and right axle transmission cases 23L and 23R constitute a portal frame, and the blower 17 is disposed between the front wheel drive shafts 53L and 53R by such a portal transmission type power transmission mechanism. Thus, the blower 17 can be disposed between the front wheels 3 and 3, the distance between the blower 17 and the mower 6 is reduced, and the transport performance of the cut grass and the like is improved.

  The hydraulic pump 45 and the motor are arranged so that the hydraulic motor shaft 47 is located at the same position as the input shaft 56 that transmits power to the drive shafts of the left and right rear wheels 4 and 4 using the input gear 42 of the hydrostatic continuously variable transmission. 46 is arranged.

  Further, the hydraulic pump shaft 43 is driven through the gear group of the traveling gear 40, the counter gear 41, and the input gear 42 constituting the traveling drive system B, but the input rotation of the hydraulic pump shaft 43 is made higher than the engine rotation. Since it can be set, the number of revolutions of the engine 12 itself can be lowered and the noise can be reduced.

  Further, since the hydraulic pump 45 and the motor 46 can be disposed at a position lower than the engine 12 by using the traveling drive system B having the above-described configuration, the input shaft 56 for driving the rear wheel 4 and the hydraulic motor shaft 47 are coaxially arranged. 4WD input can be simplified.

  In addition, since the input shaft 56 for driving the rear wheel 4 is coaxial with the hydraulic motor shaft 47, the drive system of the rear wheel 4 is simplified, and a universal joint is provided at the connecting portion between the rear wheel drive shaft 56 and the hydraulic motor shaft 47. There is no need to use it, and a simple power transmission system can be obtained.

Further, a blower drive clutch 27 of the blower / mower transmission system A is provided in front of the input shaft 25 to the power transmission mechanism in the transmission case 24, and the traveling transmission system B to the hydrostatic continuously variable transmissions 45, 46 is provided. Power transmission while shortening the front-rear length of the lawn mower by arranging a reduction mechanism 50 for driving the front wheels and a differential mechanism 51 for driving the front wheels between the gear group of the blower and the mower transmission system A. The height of the mechanism from the ground can be maintained as high as possible.
Further, by providing the blower drive clutch 27 and the mower drive clutch 36, the blower / mower drive system A can be turned on / off independently of the travel drive system B.

  Also, a blower case 18 with a blower 17 is disposed between the front wheels 3 and 3 below the cockpit 11, and the blower 17 is operated by the output of the engine 12. A turfgrass transport duct 20 that connects the blower case 18 and the collector 16 is provided above the blower case 18. Further, a shooter 21 that is shaped to rise after side view is disposed between the blower 17 and the mower 6, and the turf grass cut by the mower 6 is a short cylindrical guide guide portion from the discharge port at the rear center of the mower deck 6 a. (Exit portion) 6b and the end portion are superposed on the guide portion 6b and sent to the blower 17 via the shooter 21 provided so as to be able to be bent, and further, air is conveyed to the rear collector 16 via the duct 20 Is done. In addition, since the wind is generated by the rotation of the cutter 5 of the mower 6, the wind also helps air conveyance toward the collector 16 of the grass cut by the blower wind.

As shown in FIG. 2, a blower 17 is disposed between the left and right front wheel transmission cases 23L and 23R, and a duct 20 is connected to the rear of the blower 17. It is configured to store turfgrass and the like that have been cut.
Accordingly, the blower 17 having a large volume can be disposed between the front wheels 3 and 3, and the overall height of the lawn mower can be kept relatively low. Interference can be prevented.
In addition, since the duct 20 is displaced in the left-right direction with respect to the cockpit 11, the duct 20 can be disposed at substantially the same position as the cockpit 11 in the front-rear direction of the fuselage 2, and the overall length of the fuselage 2 can be shortened as compared with the prior art. At the same time, the space for the cockpit 11 can be expanded.

  Further, since the blower / mower drive system A has the blower drive clutch 27 for turning on / off the blower 17 and the mower drive clutch 36 disposed in the power transmission downstream portion of the clutch 27, the blower drive clutch 27 is turned off. Since power transmission to the mower 6 is also interrupted, it is possible to prevent malfunctions such as the blower 17 being stopped despite the mower 6 being driven. Therefore, the mower 6 is operating even after the blower 17 is cut, so that the grass is not clogged in the blown grass air conveying system such as the blower 17, the duct 20 and the shooter 21.

  The blower driving clutch 27 and the mower driving clutch 36 are turned on and off by a hydraulic control device using a solenoid valve 61, a solenoid valve 62 (FIG. 4) and a controller 63, respectively, and the hydraulic control device is a single PTO switch. As shown in the time chart of FIG. 5, when the PTO switch 65 is turned on, the blower drive clutch 27 is connected and the mower drive clutch 36 is turned on after a predetermined time has elapsed. Further, when the PTO switch 65 is off, timing control is performed so that the blower driving clutch 27 is turned off after a predetermined time has passed after the mower driving clutch 36 is turned off.

  In this way, the blower 17 and the mower 6 can be turned on / off by operating the single PTO switch 65, so that labor can be saved and the blower 17 and the shooter 21 can be prevented from becoming clogged when the switch is turned off. In addition, when the switch is turned on, a rapid lag in engine rotation can be prevented in order to keep a time lag.

  In addition, an open / close detection sensor 66 for the open / close door 16a provided at the discharge port of the accommodation mowing grass of the collector 16 is provided, and when the open / close door 16a of the collector 16 is open as shown in the time chart of FIG. If both the blower driving clutch 27 and the mower driving clutch 36 are both turned on and the opening / closing door 16a of the collector 16 is opened, both the clutches 27 and 36 are turned off, and safety is ensured. It can be secured. At this time, by providing a time difference between ON / OFF of the mower 6 and the blower 17, it is possible to prevent clogging during mower work.

  Further, a PTO mode changeover switch 67 is provided, and when the blower drive shaft 32 is used as a PTO drive shaft for general-purpose work such as snow removal work by switching the mode changeover switch 67 and when it is used as a mower drive shaft for mower work. By switching, only the blower driving clutch 27 may be turned on and the mower driving clutch 36 may be turned off during general-purpose work.

  When the blower drive shaft 32 is used as a PTO drive shaft for general-purpose work such as snow removal work, the blower 17 and the mower 6 are removed and the universal joint shaft connected to the blower drive shaft 32 to the input shaft for the snow remover not shown. It is set as the structure which removes snow, attaching the edge part of this, and driving the auger and discharge blower of a snowblower. FIG. 7 shows a time chart of this configuration.

In FIG. 7, it is preset that “general-purpose mode” is selected when the PTO mode changeover switch 67 is on, and “mower mode” is selected when it is off.
Therefore, when the PTO mode changeover switch 67 is turned on and the PTO switch 65 is turned on, the general-purpose mode time chart shown in FIG. 7A is set, and only the blower drive clutch 27 is operated, and the mower drive clutch 36 is Continues off. When the PTO switch 65 is turned off while the blower clutch 27 is turned on and the mower clutch 36 is turned off, the mower drive clutch 36 continues to be turned off without any change, and the blower drive clutch 27 is turned off to transmit power. Blocked. As described above, when the general-purpose mode is selected, the blower drive clutch 27 is only controlled to be turned on and off by switching with the PTO switch 65.

On the other hand, when the PTO mode changeover switch 67 is turned off and the PTO switch 65 is turned on, a mower mode time chart shown in FIG. 7B is set, and clutch control suitable for mower work is performed. That is, when the PTO switch 65 is turned on, the blower drive clutch 27 is turned on immediately, and the mower drive clutch 36 is turned on with a slight delay. When the PTO switch 65 is turned off after the mower work is performed, the mower drive clutch 36 is turned off first, and then the blower drive clutch 27 is turned off to complete the work.
Thus, when using a general-purpose work machine, only the blower drive shaft 32, which is a general-purpose PTO shaft, is turned on, and the mower drive shaft 37 is turned off, so that power loss is reduced.

As shown in FIG. 4, the blower drive shaft 32 is extended to provide a PTO spline 32a, and the PTO spline 32a can be used as an output shaft for PTO.
When the blower 17 is removed from the blower drive shaft 32 in the above configuration, the PTO spline 32a can be used, or the PTO spline 32a can be used as the output shaft of the PTO without removing the blower 17.

  Further, when the PTO spline 32a is not used, the protective cover 32b is provided on the outer peripheral portion of the PTO spline 32a, whereby the PTO spline 32a can be prevented from being worn by grass when the collector 16 is used. In order to attach the protective cover 32b to the attachment portion 32c of the blower drive shaft 32 on the base side of the PTO spline 32a, the blower 17 is fixed to the attachment portion 32c with a screw in the same manner as a nut for fixing the blower 17 to the drive shaft 32.

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

It is a principal part left view of the riding lawn mower of the Example of this invention. It is a principal part front sectional view explaining the blower arrangement of the riding lawn mower of FIG. FIG. 2 is a plan view of a mower and a front wheel drive unit of the riding lawn mower of FIG. 1. It is a principal part left view explaining the power transmission system of the riding lawn mower of FIG. It is an example of the time chart for the action | operation of the blower drive clutch and the mower drive clutch of the riding lawn mower of FIG. It is an example of the time chart for the action | operation of the blower drive clutch and the mower drive clutch of the riding lawn mower of FIG. It is an example of the time chart for the action | operation of the blower drive clutch and the mower drive clutch of the riding lawn mower of FIG.

Explanation of symbols

2 traveling machine body 3 front wheel 4 rear wheel 5 cutter 6 mower 6a mower deck 6b guide guide portion 7 floor 8 steering column 10 handle 11 cockpit 12 engine 12a engine output shaft 13 radiator 14 bonnet 15 universal joint shaft 16 collector 16a collector opening / closing door 17 blower 18 Blower case 20 Duct 21 Shuter 23 Front wheel transmission case 24 Mission case 25 Mission input shaft 25a Coupling 25b Rotating shaft 27 Blower drive clutch 27a Clutch output shaft 28, 29, 31, 33, 34, 40, 49 Gear 32 Blower drive Shaft 32a PTO spline 32b Protective cover 32c Mounting portion 36 Mower drive clutch 37 Mower PTO shaft 41 Counter gear 42 Input gear 43 Hydraulic pump drive shaft 45 Hydraulic pump 6 a hydraulic motor 47 the hydraulic motor shaft 49 drives the pinion 50 the speed reduction mechanism 50a bevel 50b intermediate gear 51 differential mechanism 51a Diff
52 Output shaft 52L, 52R Sprocket 53L, 53R Front wheel drive shaft 54L, 54R Chain 56 Rear wheel drive input shaft 61, 62 Solenoid valve 63 Controller 64L, 63R Final case 65 PTO switch 67 PTO mode switch 66 Collector open / close sensor A Blower Motor drive system A1 Blower drive system A2 Motor drive system B Travel drive system

Claims (4)

Airframe (2), mower (6) for mowing grass arranged forward in the forward direction of the airframe (2), and grass after mowing the mower (6) are blown and conveyed to collector (16) In a riding lawn mower provided with a blower (17) for
A power transmission mechanism (A) comprising a power transmission mechanism (A1) to the blower (17) and a power transmission mechanism (A2) that drives the mower (6) via the power transmission mechanism (A1); The power transmission mechanism (A) includes a blower drive clutch (27) for turning on and off the transmission mechanism (A1) to the blower (17), and a transmission mechanism (A2) for driving the mower (6) downstream thereof. A riding lawn mower characterized in that a mower drive clutch (36) for turning on and off is provided.   The blower drive clutch (27) and the mower drive clutch (36) can be turned on and off by operating a single switch (65). When the switch (65) is turned on, the blower drive clutch (27) is first connected. On, then the mower drive clutch (36) is engaged, and when the switch (65) is off, the mower drive clutch (36) is disengaged first, and then the blower drive clutch (27) is disengaged. The riding lawn mower according to claim 1, further comprising a control device (63).   The collector (16) is provided with an open / close detection sensor (66) for the door (16a) provided on the collector (16). When the door (16a) of the collector (16) is opened, the control device (63) is for driving the blower. The riding lawn mower according to claim 2, wherein the clutch (27) and the mower drive clutch (36) are disengaged almost simultaneously.   When the rotary shaft (32) for driving the blower is shared with the general-purpose PTO shaft and the PTO mode changeover switch (67) is provided, and the rotary shaft (32) for driving the blower is used as the general-purpose PTO shaft, the control device (63) The riding lawn mower according to any one of claims 1 to 3, further comprising a control for turning on the blower driving clutch (27) and turning off the mower driving clutch (36). .

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