JPH057032U - Mower Tractor Mt Mount Mower Drive Unit - Google Patents

Abstract

(57) [Summary] [Purpose] Efficiently transmit power from the traveling mission of this machine to the mid-mount mower placed on the abdomen, and obtain a transmission body that does not have the problem of life reduction or abnormal noise in the transmission section. Aim to reduce the size of the mower tractor. [Structure] A mid mount mower is hung up and down supported on the abdomen of the vehicle body, and a mid PTO shaft projecting from a traveling mission and an input shaft of the mid mount mower are arranged so as to face one side in the left-right direction, and each shaft end is arranged. The bevel gear transmission, which is relatively rotatable around the shaft center, is installed on the shaft, and the shafts are linked and linked together.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a technique for transmitting power to a mid mount mower attached to the abdomen of a tractor.

[0002]

[Prior Art]

 Conventionally, the technology of mounting a mid mount mower between the front and rear wheels of a tractor has been publicly known. For example, it is a technique disclosed in Japanese Utility Model Laid-Open No. 61-81427. These are arranged with the mid-PTO shaft facing forward from the traveling mission, the mid-mount mower input shaft facing rearward so as to face the mid-PTO shaft, and a universal joint is connected between both shafts to transmit power. I was doing it.

[0003]

[Problems to be solved by the device]

 With the above-mentioned structure, when the mid mount mower is lowered and grounded during work, the universal joint section bends. The shorter the wheel base and the shorter the distance between the mid PTO shaft and the mid mount mower input shaft in order to reduce the size of the mower tractor, the larger the bending angle and the shorter the life of the universal joint. It becomes a factor. There is also a problem that abnormal noise is generated in this part. Therefore, the drive unit itself of the mid-mount mower was a factor that hinders the miniaturization of the small-sized mower attractor.

[0004]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention is a mower tractor in which a mid mount mower is hung and supported on the abdomen of a vehicle body so that it can be lifted and lowered. The shaft and the shaft are arranged so as to face one side in the left-right direction, and a bevel gear transmission that is relatively rotatable around the shaft center is installed at each shaft end, and both shafts are linked and linked.

[0005]

【Example】

 The problems to be solved by the present invention and the means for solving the problems are as described above. Next, the structure of the embodiment shown in the accompanying drawings will be described. Fig. 1 is a perspective view of the traveling mission and the mid mount mower, Fig. 2 is a side view with the mid mount mower grounded, Fig. 3 is a side view with the mid mount mower raised, and Fig. 4 is the traveling device and mower. 3 is a plan view showing the drive transmission path of FIG.

The engine E of the mower tractor is installed inside the bonnet 1, the output shaft 10 of the engine E is projected downward, the drive pulley 11 is fixedly mounted on the output shaft 10, and the front part of the other running mission 13 is provided. The input shaft 14 is projected upward and an input pulley 15 is fixedly provided. A belt 12 is wound between the input pulley 15 and the drive pulley 11 to transmit the power from the engine E to the traveling mission 13. The traveling mission 13 is formed integrally with the axle case, and rear axle housings are formed on both sides of the rear portion of the traveling mission 13 to project the axle 16 and pivotally support the rear wheel 3.

As shown in FIG. 4, the inside of the traveling mission 13 has a bevel gear 20 fixed to the other end of the traveling mission 13 of the input shaft 14, and a bevel gear 21 meshes with the bevel gear 20. The bevel gear 21 is fixed to the pump shaft 22 of the HST transmission A, and the variable hydraulic pump 23 is driven by the rotation of the pump shaft 22, and the hydraulic oil is sent to the hydraulic motor 24 to be driven. A gear 31 is fixedly mounted on a motor shaft 30 of the hydraulic motor 24, and a ring gear 32 of a differential device D is meshed with the gear 31 so that the axle 16 can be driven. The HST transmission A can change the rotation speed and the rotation direction of the axle 16 by changing the swash plate of the variable hydraulic pump 23.

Further, the other end of the pump shaft 22 penetrates the variable hydraulic pump 23, and a clutch plate of the working machine clutch 25 is fixedly mounted on the clutch shaft 26 projecting to the other side of the working machine clutch 25. A gear 27 is fixed and meshes with a gear 28 on a mid PTO shaft 29. The mid-PTO shaft 29 is projected from the traveling mission 13 in parallel with the axle 16 in the left-right direction of the airframe, and the bevel gear transmission 33 is fitted to the end of the mid-PTO shaft 29. The bevel gear transmission 33 is rotatably mounted in the center, and the bevel gear 34 and the bevel gear 35 are engaged with each other inside the bevel gear transmission 33. The drive transmission direction is changed by 90 degrees, and the bevel gear 35 is fixed to the transmission shaft 36. The other end of the shaft 36 is inserted into the sliding case 37 by spline fitting so that it can be expanded and contracted.

A transmission shaft 39 is also spline-fitted to the other side of the sliding case 37 so that the transmission shaft 39 can be expanded and contracted, and the other end of the transmission shaft 39 is inserted into a bevel gear transmission 40 to fix a bevel gear 41. An input shaft 43, which is meshed with the bevel gear 42 and protrudes from the gear case 44 of the mid mount mower M in the same direction as the mid PTO shaft 29, is inserted and fitted into the bevel gear transmission 40, and the input shaft 43 The bevel gear 42 is fixed on the upper portion, and the bevel gear transmission 40 is rotatable about the input shaft 43.

The mid-mount mower M is disposed between the front wheels 2 and the rear wheels 3 in the abdomen below the body frame, and is located between the front of the cover 4 of the mid-mount mower M and the front of the body frame. A link 5 is rotatably interposed, a rear link 6 is rotatably interposed between the rear portion of the cover 4 and the center of the machine frame, and an actuator such as a hydraulic cylinder is attached to the front link 5 or the rear link. Alternatively, it is interposed between the mid mount mower M and the body frame so that the mid mount mower M can be moved up and down in parallel. A gear case 44 is fixedly mounted on the cover 4, the input shaft 43 is projected from the gear case 44, and a bevel gear 45 is fixed in the gear case 44. The bevel gear 46 is meshed with the bevel gear 45. The bevel gear 46 is fixedly mounted on the upper end of a mowing drive shaft 47 vertically provided on the gear case 44, and the lower end of the mowing drive shaft 47 penetrates the case 4 and fixes a mowing blade 48.

When the mid mount mower M is moved up and down with such a configuration, the bevel gear transmission 33 rotates about the mid PTO shaft 29, while the bevel gear transmission 40 rotates about the input shaft 43 of the mid mount mower M. Rotate in opposite directions, so that they rotate relative to each other, and because the center of rotation of the lifting link and the center of rotation of the transmission shaft are different, the length between the bevel gear transmissions 33 and 40 is different. However, since the transmission shafts 36 and 39 are inserted into the sliding case 37, the transmission shafts 36 and 39 expand and contract to accommodate changes in length. There is no change and we can communicate.

[0012]

[Effect of the device]

 With the above configuration, there is no bending part on the transmission shaft when the mid mount mower M is moved up and down, and the bevel gear transmission body rotates relative to the input shaft of the mid PTO shaft and the mid mount mower, and the power transmission is performed. It is now possible to transmit power to the mid-mount mower without any problems such as shortening the life of parts or abnormal noise. In addition, since the power is transmitted via the bevel gear transmission, the rotation angle of the lifting link can be increased, and the midmount mower can be arranged closer to the traveling mission side without the need to set the mid PTO shaft to the rear position, and the wheel can be arranged. It became possible to construct a small moat attractor with a short base.

[Brief description of drawings]

FIG. 1 is a perspective view of a traveling mission and a mid mount mower.

FIG. 2 is a side view showing a state in which the mid mount mower is grounded.

FIG. 3 is a side view showing a state in which a mid mount mower is raised.

FIG. 4 is a plan view showing a drive transmission path to a traveling device and a mower.

[Explanation of symbols]

 M Mid-mount mower 13 Running mission 29 Mid-PTO shaft 33/40 Bevel gear transmission 36/39 Transmission shaft 43 Input shaft

Claims (1)

[Claims for utility model registration] [claim 1] In a mower tractor in which a mid mount mower is hung and supported on the abdomen of a vehicle body, the mid PTO shaft protruding from a traveling mission and the input shaft of the mid mount mower are provided. A mid-mount mower drive device for a mower tractor, characterized in that it is arranged toward one side in the left-right direction, and a bevel gear transmission that is rotatable relative to the shaft center is installed at each shaft end to interlock both shafts.