JP3542100B2 - Riding lawn mower - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a working device in which a mower is arranged at a position in front of a traveling body, and a transmission case including a differential device for a front wheel is disposed at a front portion of the traveling body, and is protruded forward from the transmission case. The present invention relates to a riding lawn mower in which a drive output shaft and the mower are linked and connected via a transmission shaft and a universal joint.
[0002]
[Prior art]
Conventionally, as a riding lawn mower of this type, as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-117505, an output shaft is projected from a front wall portion located at the front end of a transmission case toward a mower, There is known an output shaft and a mower that are interlockedly connected via a transmission shaft and a universal joint.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional structure, the mower whose position in the front-rear direction with respect to the traveling body is set to a predetermined position and the output shaft are interlocked via the transmission shaft and the universal joint. , The relative angle between the output shaft and the transmission shaft, and the relative angle between the transmission shaft and the input shaft on the mower side are relatively large, so that the universal joint is liable to wear and has low durability. However, there is a problem that transmission noise at the universal joint is large.
[0004]
The present invention has been made in view of the above circumstances, and is a riding type that can increase the durability of a mechanism that interlocks an output shaft for driving a working device and a mower and that suppresses generation of noise during transmission. The purpose is to provide a lawn mower.
[0005]
[Means for Solving the Problems]
(Structure) In a riding lawn mower according to claim 1 of the present invention, a mower is provided at a position in front of a traveling body, and a traveling case including a differential device for a front wheel and a clutch for a working device is mounted on the traveling case. An output shaft for driving a working device, which is disposed at a front portion of the body and protrudes forward from the transmission case via the clutch for the working device, and the mower are linked to each other via a transmission shaft and a universal joint. In the riding lawn mower, the working device clutch is disposed so as to be displaced to the side of the differential device, and the output shaft extending forward from the working device clutch is provided in the transmission case with the differential device. Is provided at a position that is laterally above and at a height that overlaps with an upper portion of the differential device in a side view, and a concave portion that is retracted from a front end of the transmission case is provided on a front portion of the transmission case. And the output shaft protrudes from the concave portion.
[0006]
(Operation) According to the configuration of the first aspect of the present invention, the output shaft for driving the working device is displaced to the side of the differential device and extends forward from the clutch for the working device, so that the transmission is performed. In the case, it is disposed at a position laterally above the differential device, and at a height position overlapping the upper portion of the differential device in a side view, and projects forward from a position retracted from the front end of the transmission case, The output shaft is disposed at a low height position overlapping with the upper portion of the differential device in a side view, and a transmission shaft connected to the mower via a universal joint and a universal joint between the output shaft and the power shaft. All the connection points are located on the rear side as compared with the related art. Thereby, the angle between the output shaft and the transmission shaft, which are interlocked and connected via the universal joint, and the angle between the transmission shaft and the input shaft of the mower can be made smaller than before.
[0007]
(Effects) Therefore, according to the configuration of the first aspect of the present invention, wear of the universal joint is suppressed, durability is enhanced, and transmission noise is suppressed, so that there is an advantage that transmission to the mower can be efficiently performed.
[0008]
(Structure) The riding lawn mower according to claim 2 of the present invention is the riding lawnmower according to claim 1, wherein the mower is moved to a side where the output shaft is deviated from a center position of the traveling body in the left-right direction. It is characterized in that it is deployed in a deviated state.
[0009]
(Operation) According to the configuration of the second aspect of the present invention, since the mower is provided in a state where the output shaft is deviated to the side where the output shaft is deviated from the center position of the traveling body in the left-right direction, the traveling is performed. If the mower is turned slightly and the mower is turned slightly around the deviated side of the mower, the remaining uncut area on the lawn can be reduced, and the deflected side of the mower is the left and right center of the traveling airframe. And the output shaft is set on the side where the output shaft deviates, so that even in a planar positional relationship, the relative angle between the output shaft and the transmission shaft in the universal joint, and the relative angle between the transmission shaft and the mower. The angle relative to the input shaft can be small.
[0010]
(Effects) Therefore, according to the configuration of claim 2 of the present invention, when the traveling body is made to make a small turn around the deviated side of the mower, the uncut portion of the lawn at that time is reduced, so that the mowing is reduced. The post-processing for cutting the remaining part becomes easier, and the relative angle between the output shaft and the transmission shaft and the relative angle between the transmission shaft and the input shaft of the mower are reduced in plan view, resulting in wear at the universal joint. This has the advantage that the noise can be further suppressed and the generation of transmission noise can be further suppressed, and the power can be more efficiently transmitted to the mower.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a riding lawn mower. In this riding lawn mower, an engine 4 and a boarding operation unit 5 are provided on a traveling body 3 supported by a pair of left and right front wheels 1, 1 and rear wheels 2, 2 and arranged below the boarding operation unit 5. A mower 8 is provided at a position in front of the traveling body 3 in a state where the mower 8 is attached to a pair of left and right arms 7 extending forward from a transmission case 6 described later.
[0012]
As shown in FIG. 3, power from an engine 4 mounted on the rear part of the traveling body 3 is transmitted via a main shaft 9 to a hydrostatic continuously variable transmission (hereinafter, referred to as HST) 10 disposed on the front side of the body. And the transmission case 6 integrally connected to the HST 10 is fixedly connected to the traveling body 3. As shown in FIGS. 3 to 5, the transmission case 6 receives, via the first input shaft 12, the shifting power from the hydraulic motor M of the HST 10 that is shifted by the shift pedal 11 provided in the riding operation unit 5. The input power is transmitted to a front wheel differential device 14 via a gear transmission mechanism 13. Further, a braking device 15 for the input power is disposed at a lower rear portion of the transmission case 6. Further, the power from the hydraulic pump P of the HST 10 is transmitted to the second input shaft 16, and the output shaft 19 for driving the working device is transmitted from the second input shaft 16 via the second gear transmission mechanism 17 and the working device clutch 18. It is configured to be transmitted to. As shown in FIG. 5, the hydraulic pump 20 used for elevating and lowering the mower 8 is driven by the power from the second input shaft 16.
[0013]
As shown in FIG. 3 and FIG. 4, the output shaft 19 is disposed at a position deviated to the right lateral side with respect to the differential device 14, extends forward, and extends to the transmission case 6. It projects from the formed through hole 21 in an oil-tight state. The through-hole 21 is formed in a vertical wall 22a facing the front, located at the back of the concave portion 22 which is recessed from the front end portion A in the transmission case 6. The output shaft 19 and the input shaft 23 of the mower 8 are linked to each other via universal joints 24 and 25 and a transmission shaft 26 as shown in FIGS. Here, since the output shaft 19 is disposed at a position deeper than the front end A of the transmission case 6 and is linked to the transmission shaft 26 via the universal joint 24, the output shaft 19 is connected to the transmission case 6. The relative angle between the output shaft 19 and the transmission shaft 26 is smaller than that of the shaft protruding forward from the front end A, and the output shaft 19 and the transmission shaft 26 are interlocked via the universal joint 25. The relative angle between the shafts of the input shaft 23 and the transmission shaft 26 of the mower 8 is also small, so that the wear at the universal joints 24 and 25 is suppressed, and the transmission noise at the universal joints 24 and 25 is suppressed. Is also suppressed.
Further, as shown in FIG. 2, the mower 8 is arranged in a state shifted to the right side more than the differential device 14 located at the center between the pair of left and right front wheels 1, 1. That is, the mower 8 is arranged in a state where the input shaft 23 arranged at the center position in the left and right width direction of the mower 8 is slightly deviated rightward in the left and right direction from the position of the differential device 14. As a result, the relative angles of the output shaft 19, the transmission shaft 26, and the input shaft 23, which are located on the right side of the differential device 14, can be reduced even in a plan view. Is further suppressed, and the generation of transmission noise in the universal joints 24 and 25 is further suppressed.
[Brief description of the drawings]
FIG. 1 is an overall side view showing a riding lawn mower. FIG. 2 is a plan view showing a mower. FIG. 3 is a partially cutaway side view showing a transmission case. FIG. 4 shows gears and supporting shafts in the transmission case. FIG. 5 is a schematic explanatory view showing the inside of the transmission case. FIG. 6 is a perspective view showing the appearance of the transmission case.
3 Traveling machine body 6 Transmission case 8 Mower 14 Differential device 16 Transmission shaft 19 Output shaft 22 Recess 24, 25 Universal joint

Claims (2)

The mower (8) is disposed at a position in front of the traveling body (3), and the transmission case (6) in which the differential device (14) for the front wheel (1) and the working device clutch (18) are installed together is provided. An output shaft (19) for driving a working device, which is disposed at a front portion of the traveling body (3) and protrudes forward from the transmission case (6) via the working device clutch (18), and the mower ( 8) is linked with a riding lawn mower via a transmission shaft (26) and a universal joint (24) (25),
The working device clutch (18) is disposed so as to be displaced to the side of the differential device (14), and the output shaft (19) extending forward from the working device clutch (18) is transmitted. In the case (16), it is disposed at a position laterally above the differential device (14) and at a height overlapping with an upper portion of the differential device (14) in a side view,
A recess (22) that is retracted from the front end of the transmission case (6) is formed on the front surface of the transmission case (6) so as to be deviated to the side of the differential device (14), and the output shaft ( 19) a riding lawn mower protruding from the recess (22). The riding type according to claim 1, wherein the mower (8) is arranged so as to be deviated to a side where the output shaft (19) is deviated from a center position of the traveling body (3) in the left-right direction. Lawn mower.

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