JPH05153814A - Transmission structure in riding type field working machine - Google Patents

Abstract

PURPOSE:To compact a transmission which is a power transmission route of a riding type field working machine. CONSTITUTION:An operating system transmission shaft 13 is displaced above an input shaft 9 and to the side of a differential mechanism 12 and a running system intermediate shaft 14 is displaced under the input shaft and to the differential mechanism 12. A running system transmission shaft 15 is displaced and arranged under the running system intermediate shaft 14 and to the side of the differential mechanism 12. A power transmission route composed of the operating system and the running system with each gear provided in the shafts 13, 14 and 15 is made to pass along the front outer periphery of the differential mechanism 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission structure in a riding-type field working machine such as a riding-type rice transplanter, a seeder, and a fertilizer applicator.

[0002]

BACKGROUND OF THE INVENTION Generally,
Among these seed field work machines, there are a work space adjustment mechanism for adjusting the space between field works, a traveling speed change mechanism for changing the speed of machine traveling, and a differential mechanism for performing a differential between the left and right traveling wheels. There is one that is provided in the same transmission. However, in the conventional system, the work system intermediate shaft provided with these work space adjusting mechanism shifter gears and the travel system intermediate shaft provided with the traveling transmission mechanism shifter gears are arranged in a plane in front of or above the differential mechanism. , Inevitably, the transmission must be long in the front-rear direction, which was one of the factors that hindered shortening the front-rear length of the aircraft.

[0003]

SUMMARY OF THE INVENTION The present invention was devised with the object of providing a transmission structure for a riding-type field working machine capable of eliminating these drawbacks in view of the above circumstances. The transmission for transmitting the engine power to the field work system and the machine traveling system, the work interval adjusting mechanism for adjusting the work interval, and the travel speed change for changing the machine traveling. In a riding-type field work machine provided with a mechanism and a differential mechanism for performing a differential between the left and right traveling wheels, a work system transmission shaft provided with the work interval adjustment mechanism shifter gear is provided more than an engine power input shaft. It is biased to the upper side and to the differential mechanism side, and the traveling system intermediate shaft where the shift gear for the traveling speed change mechanism is provided is biased to the lower side to the differential mechanism side below the engine power input shaft, and the traveling speed is further changed. Gears provided on the respective shafts from the engine power input shaft are provided with transmission shafts provided with power transmission gears from the structure to the differential mechanism below the intermediate shaft of the traveling system and further offset to the differential mechanism side. The power transmission path for the differential mechanism is arranged along the outer circumference of the differential mechanism.

According to the present invention, the transmission can be shortened as much as possible in the front-back direction.

[0005]

An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of a riding type rice transplanter. The traveling machine body 1 has an engine 2 mounted on the front side thereof, and a rear side of the machine body has a seedling stand 3 having a low front and rear height and a traveling body 1 The planting work unit 5 provided with various member devices such as the planting claws 4 for performing the planting operation at the same timing is mounted in a vertically movable manner.

On the other hand, 6 is a transmission case in which the power from the engine 2 is input through the continuously variable transmission mechanism 7, and the present invention is applied to the transmission 8 installed in the transmission case 6. Has been done. That is, the power from the engine 2 is transmitted to the input shaft 9 which is integrally rotatably supported by the passive pulley 7a of the continuously variable transmission mechanism 7 and rotatably supported by the transmission case 6. The input shaft 9 is provided with a main clutch mechanism 10 and a transmission gear 11, and the power input to the input shaft 9 is transmitted through the main clutch mechanism 10 to the transmission gear 11.
The input shaft 9 is disposed slightly above and in front of the differential mechanism 12 for the front wheels.

In the transmission case 6, a work system transmission shaft 13, a traveling system intermediate shaft 14, and a traveling system transmission shaft 15 are respectively rotatably supported in parallel with the input shaft 9 as will be described later. The system transmission shaft 13 is biased to the differential mechanism 12 side above the input shaft 9, and the traveling system intermediate shaft 14
Is provided below the input shaft 9 and to the differential mechanism 12 side, and the traveling system transmission shaft 15 is provided below the traveling system intermediate shaft 14 and further to the differential mechanism 12 side. .. A shifter gear 13a for adjusting the planting interval, that is, an inter-stock adjustment, is spline-fitted to the work-system transmission shaft 13 so as to be movable in the axial direction, and a reverse intermediate gear 13 is provided.
b is integrally attached. The inter-stock adjustment shifter gear 13a is a shifter fork 16a provided on a shifter shaft 16 pivotally supported on the upper portion of the transmission case 6.
Of the gear teeth 11a having different numbers of teeth of the transmission gear 11 provided on the input shaft 9, by the axial movement of the gears (for example, movement based on the operation of an appropriate operating tool such as a stock shift lever not shown).
11b sandwiches the neutral and selectively meshes, whereby the rotation speed of the work system transmission shaft 13 with respect to the input shaft 9 can be shifted in two stages. The power transmitted to the work system transmission shaft 13 is applied to the torque limiter 17 provided on the work system transmission shaft 13, the bevel gear mechanism 19 provided between the work system transmission shaft 13 and the work system output shaft 18, and the planting. Work system output shaft 18 via work clutch mechanism 20
It is configured to be transmitted to. Reference numeral 20a is a stopper for keeping the work clutch mechanism 20 in a normally disconnected state.

On the other hand, on the left and right ends of the traveling system intermediate shaft 14, there are provided a main shifting shifter gear 21 for performing traveling shifting.
The auxiliary shift shifter gears 22 are spline-fitted so as to be movable in the axial direction. The shifter shafts 23, 24 provided with the shifter forks 23a, 24a of these shifter gears 21, 22 are the intermediate shafts 14 of the traveling system. At a lower position in front of the traveling system transmission shaft 15, the left and right side walls of the transmission case 6 are provided so as to substantially face each other. Then, the main shift shifter gear 21 moves in the axial direction based on a shift operation of a main shift lever 25, which will be described later, and selectively sandwiches the neutral point between one gear tooth 11a of the transmission gear 11 and the reverse intermediate gear 13b. It is possible to switch between forward and reverse by meshing.

Further, the auxiliary transmission shifter gear 22 is integrally provided with large and small gear teeth 22a and 22b having different numbers of teeth, and the traveling system transmission shaft 15 has large and small transmission gears 15a having different numbers of teeth. , 15b are provided integrally with each other. Then, by selectively engaging the gears based on the low-high speed shift operation sandwiching the neutral position of the auxiliary shift lever 26, the high-low speed two-stage running auxiliary shift can be performed. Further, the traveling system transmission shaft 15 is integrally provided with an output gear 15c which is constantly meshed with the input gear 12a of the front wheel differential mechanism 12 and a bevel gear 15d for transmitting power to the rear wheels. ing. And by being configured in this way,
Power transmission paths for the traveling system and the working system are arranged along the periphery of the front side outer periphery of the differential mechanism 12.

On the other hand, in this embodiment, the relationship between the continuously variable transmission mechanism 7 and the shifter shaft 23 with respect to the main transmission lever 25 is configured as follows. That is, the bracket 27 is swingably supported on the continuously variable transmission support shaft 1a which is integrally projected from the machine body side, and the bracket 27 is further supported in the direction orthogonal to the support shaft 1a. A main transmission support shaft 27a is provided facing toward the main transmission. And this support shaft 2
7a, an intermediate portion of the main shift lever boss portion 25a is swingably provided. Further, a swing arm 27b integrally projecting from the bracket 27 is linked to a speed change rod 7b for performing a speed change operation of the continuously variable transmission mechanism 7, and the main speed change lever 25 is connected to the main speed change lever 25. By swinging in the direction of arrow A about the continuously variable transmission supporting shaft 1a, the pulley diameter of the pulleys forming the continuously variable transmission mechanism 7 is changed, whereby the continuously variable transmission is performed. Is set to.

On the other hand, a guide pin 25 guided by a lever guide 28 is provided at the tip of the lever boss portion 25a.
b is provided. The guide pin 25b has a substantially L
One end of the connecting plate 29 bent in a letter shape is provided, and the other end of the connecting plate 29 is integrally provided with one end of an operating rod 30 pivotally supported by the transmission case 6. Has been. The main shifting shifter shaft 23 is connected to the distal end of an operating arm 30a integrally formed with the base end at the other end of the operating rod 30, and the main shifting lever 25 is connected to the main shifting support shaft 27a. By swinging in the direction of arrow B as a fulcrum, the main shift shifter shaft 23
Is moved in the axial direction, so that the forward / backward shift can be performed.

In the embodiment of the present invention constructed as described above, the transmission case 6 is provided with the differential gear mechanism 12 for the front wheels and the work system transmission shaft 13 provided with the inter-stock adjustment shifter gear 16 and the traveling main body. A transmission system intermediate shaft 14 provided with a shift shifter gear 21 and a traveling auxiliary shifter gear 22, and power transmission gears 15a, 15b for transmitting the traveled main / sub-shifted power to the differential mechanism 12. The shaft 15 is provided. Among these shafts 13, 14, 15, the work system transmission shaft 13 is biased above the input shaft 9 and toward the differential mechanism 12, and the traveling system intermediate shaft 14 is provided. Is biased below the input shaft 9 toward the differential mechanism 12 side, and the traveling system transmission shaft 15 is arranged below each traveling system intermediate shaft 14 and further toward the differential mechanism 12 side. Was Power transmission path via the A is arrangement such that along the outer longitudinal around the differential mechanism 12. As a result, the transmission 8 does not become long in the front-rear direction unlike the conventional one in which these power transmission paths are arranged in a plane in the front-rear direction, and the space around the outer periphery of the differential mechanism 12 is reduced. It is possible to effectively use the compact arrangement, and the transmission case 6 can be made lighter and more compact. Therefore, it is possible to reduce the weight and the size as well as the cost.

In addition, in this type, the main shift shifter shaft 2
3 and the auxiliary shift shifter shaft 24 are disposed below the intermediate shaft 14 of the traveling system and in front of the transmission shaft 15 of the traveling system so as to face each other in the left-right direction.
There is no difficulty in arranging 4, and the installation space can be effectively secured in the dead space, and it is possible to achieve further weight reduction and compactness.

[0014]

In summary, since the present invention is constructed as described above, the power from the engine power input shaft passes through the work system power transmission path through the work system transmission shaft provided with the work distance adjusting mechanism shifter gear. And a travel system power transmission path that goes through a travel system intermediate shaft provided with a shift gear for a travel transmission mechanism and a travel system transmission shaft provided with a power transmission gear for transmitting power to a differential mechanism. , These power transmission paths are arranged along the longitudinal direction of the outer periphery of the differential mechanism, and as a result, the transmission is arranged in the front-back direction like the conventional one in which these power transmission paths are arranged in the front-back direction in a plane. It is possible to make a compact layout that effectively uses the space around the outer circumference of the differential mechanism without making it too long, and it is possible to make the transmission case lightweight and compact. It to a connexion is, can also be achieved cost with weight and size reduction.

[Brief description of drawings]

FIG. 1 is a side view of a riding-type rice transplanter.

FIG. 2 is an enlarged side view of a main part.

FIG. 3 is a developed sectional view showing a power transmission system of a transmission.

FIG. 4 is a developed sectional view showing a shifter portion of the transmission.

FIG. 5 is a rear view of the transmission.

FIG. 6 is a side view of a main shift lever portion.

FIG. 7 is a rear view of the main shift lever portion.

[Explanation of symbols]

 1 traveling machine body 2 engine 6 transmission case 7 continuously variable transmission mechanism 9 input shaft 11 transmission gear 12 differential device 13 actuation system transmission shaft 14 traveling system intermediate shaft 15 traveling system transmission shaft 16 shifter shaft 21 main shifting shifter gear 22 auxiliary Shifting gear for shifting 23 Shifter shaft 24 Shifter shaft 25 Main shifting lever

Claims (1)

[Claims] Claim: What is claimed is: 1. A transmission for transmitting engine power to a field work section system and a machine body traveling section system, a work interval adjusting mechanism for adjusting a work interval, and a mechanism for shifting a machine body traveling. In a riding-type field work machine provided with a traveling speed change mechanism and a differential mechanism for performing a differential operation between left and right traveling wheels, a work system transmission shaft provided with the work interval adjusting mechanism shifter gear is an engine power input shaft. Above and above the differential mechanism side, and the traveling system intermediate shaft provided with the shift gear for the traveling speed change mechanism below the engine power input shaft and toward the differential mechanism side, and further from the traveling speed change mechanism to the differential mechanism. The transmission shafts provided with the power transmission gears are provided below the intermediate shaft of the traveling system and further offset to the differential mechanism side, and the power transmission from the engine power input shaft to the gears provided on each of these shafts is performed. A transmission structure in a riding-type field working machine, characterized in that a moving path is arranged along a longitudinal direction of an outer periphery of a differential mechanism.