JP2953802B2 - Tiller power transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmitting device for a cultivator having a traveling transmission and a work transmission.

[0002]

2. Description of the Related Art In this type of conventional power transmission device of a cultivator, as described in Japanese Patent Application Laid-Open No. 63-82827 and Japanese Utility Model Application Laid-Open No. 2-85064, the transmission always engages in a transmission case. A power distribution gear group engaged by sliding is housed, and power input from the power transmission pulley is distributed to the traveling transmission and the work transmission via the gear group. In addition, 2-1433
As described in Japanese Patent Publication No. 26 and Japanese Utility Model Publication No. 52-67805, there is also a part that has a continuously variable transmission (hydraulic transmission device).

[0003]

However, in such a conventional tiller having a general power transmission device, the number of speed changeover stages for traveling and working is large, the structure becomes complicated, and The shifting operation is cumbersome, making it difficult for unskilled people, women and girls to drive. In addition, those equipped with a hydraulic transmission device do not have such a drawback, but have problems such as oil leakage and sealability.

Accordingly, the present invention has been made to solve such a problem, and is intended to simplify the structure of a transmission unit.
It is an object of the present invention to provide a power transmission device for a tiller, which can simplify shifting operations, improve sealing performance, prevent oil leakage, and the like.

[0005]

According to the first aspect of the present invention, a power transmission input shaft is provided which protrudes inward from the outside of one side surface of the transmission case. A power transmission device of a tiller having a traveling transmission device and a working transmission device, wherein a continuously variable transmission interposed between the power transmission input shaft and the traveling transmission device is provided on the other side of the transmission case. Provided in
An input shaft and an output shaft of the continuously variable transmission protrude into the transmission case in the same direction, and the input shaft of the continuously variable transmission and the power transmission input shaft are connected via an intermediate coupling device; The power take-off shaft of the working transmission is projected outward from the other side of the transmission case, and the power transmission input shaft and the power take-out shaft of the working transmission are directly connected without passing through the continuously variable transmission. On the other hand, the output shaft of the continuously variable transmission is connected to the traveling transmission device, and the diameter of the power transmission input shaft connected to the power take-off shaft is changed to the diameter of the input shaft of the continuously variable transmission. It is characterized by being formed larger.

According to a third aspect of the present invention, a tillage having a traveling transmission device and a work transmission device driven by a power transmission input shaft provided to project inward from the outside of one side surface of the transmission case. A continuously variable transmission interposed between the power transmission input shaft and the traveling transmission device on the other side of the transmission case, wherein the continuously variable transmission is mounted on the power transmission input shaft. And a traveling output shaft (O5) between the output shaft of the continuously variable transmission and the traveling output shaft (O5) protruding into the transmission case in the same direction as the input shaft of the continuously variable transmission. A power interrupting device is provided in the transmission device, and a power take-out shaft of the working transmission is projected outward from the other side surface of the transmission case, and the power transmission input shaft and a power take-out shaft of the working transmission are connected to each other. Previous The output shaft of the continuously variable transmission is connected directly to the traveling transmission device without passing through the continuously variable transmission, and the diameter of the power transmission input shaft connected to the power take-off shaft is adjusted by the non-stepless transmission. It is characterized in that it is formed larger than the diameter of the input shaft of the stepped transmission.

[0007]

According to the construction of the first aspect, the work transmission device to which a large work torque is applied is provided by the transmission input shaft 11 (O).
₁₎ or directly linked via a gear or the like connecting collar (parts) O _9, is thicker input shaft reinforcement. However, the input shaft of the HST, which connects between the transmission transmission device and the input shaft that does not apply much torque, is not integrated with the transmission input shaft, but is divided so that the working torque is not directly applied to the HST input shaft. And the HST body could be downsized. Also, since the input and output shafts of the continuously variable transmission both protrude only in the transmission case in the same direction, there is no oil leakage to the outside, and the driver can operate the single continuously operated lever to operate the continuously variable transmission through the continuously variable transmission. Thus, the proper running speed can be easily selected, and the working state can be appropriately operated through the working transmission composed of gears as in the related art. At this time, the continuously variable transmission also functions as a balancer for balancing when the body width is set to be narrow. Also,
According to the configuration of the third aspect, the connection between the continuously variable transmission and the traveling transmission device is disconnected via the power interrupting device, so that the traveling side is free, and the tiller can travel freely by human power or the like. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a power transmission device for a tiller according to the present invention, wherein 1 is a transmission case, and 2 is a hydrostatic continuously variable transmission (hereinafter referred to as "H").
ST), 3 is a power transmission pulley, 4 is a traveling transmission case, and 5 is a work transmission case.

The transmission case 1 is assembled by fastening the left and right split cases 6 and 7 with bolts 8 and assembling therein a working transmission 9 and a traveling transmission 10.
(Also referred to as a traveling transmission device).

In the transmission case 1, a power transmission input shaft 11 is provided from outside the right split case 6.
(O ₁ ) is fitted, and one end 12 faces the inside of the split case 6, and the power transmission pulley 3 is attached to the other end of the power transmission input shaft 11 protruding outside from the split case 6. I have. One end 12 of the power transmission input shaft 11 (O ₁ ) is connected to the traveling transmission 10 via the HST 2 and to the work transmission 9 without the HST, as described later. .

That is, a gear G ₁ is formed on the periphery of the end 12 of the power transmission input shaft 11 (O ₁ ) facing the inside of the transmission case 1, and the gear G ₁ is a working counter of the working transmission 9. Gear G ₁₀ spline-coupled to axis O ₆
Is engaged with.

[0013] The working machine adjacent thereto together with the the working counter shaft O _6, also normal rotation shifter gear (rotary reverse rotation for shifter gear) G ₁₁ to forward the working machine of the rotary or the like is splined sprocket S ₂ to reverse is loosely fitted. The surface facing the said sprocket S ₂ and the shifter gear G ₁₁ pawl 14 constituting the dog clutch 13 are respectively formed. The shifter gear G ₁₁ the working counter shaft by a shift fork (not shown) O
_The gear G slidingly fitted on the working power take-off shaft O ₇
It is designed to mesh with ₁₂ .

[0014] The sprocket S ₃ on the side of the loosely fitted a gear G ₁₂ is integrally formed with, the sprocket S ₃
Chain C is wrapped around the sprocket S ₂ of the working counter shaft O ₆ side.

[0015] via the clutch ring (shifter) 15 is splined coil spring 16 for power intermittently to the working machine to the animal force output shaft O ₇ parts in the side of the sprocket S ₃ of the power take-off shaft O ₇ side the biased in the sprocket S ₃ side, and can disengage the sprocket S ₃ by the dog clutch type. 17 is the sprocket S ₃
And a claw formed on each facing surface of the clutch ring 15 and the clutch ring 15.

One end of the power take-off shaft O ₇ protrudes outside from the left split case 7, and a sprocket S ₄ is provided at the protruding end thereof and is disposed in the working transmission case 5.

On the other hand, the power transmission input shaft 11 (O ₁ )
A spline shaft 18 projecting concentrically is formed integrally with the end portion 12 of the shaft. A cylindrical shaft (connection collar) O ₉ having a spline on the inner surface is fitted to the spline shaft 18, and the collar O ₉ is fitted. the further continuously variable transmission input shaft O ₈ described later HST2 is connected splined. Thus, the spline shaft 18 and the cylindrical shaft O ₉ constitute an intermediate connecting device arranged on the same straight line as the power transmission input shaft 11.

The HST 2 is mounted on the outer surface of the left split case 7 and has an input shaft O ₈ and an output shaft O _{2 of the} HST _2.
Both extend in parallel in the same direction, and their ends 19 and 20 face the inside of the left divided case 7, that is, the inside of the transmission case 1.

A gear G ₂ is attached to the end 20 of the continuously variable output shaft O ₂ facing the inside of the transmission case 1, and the gear G ₂ is connected to the counter shaft O ₃ of the traveling transmission device 10.
Has it fixed gear G ₃ and meshing with. A switching shifter gear 21 (power interrupting device) integrally provided with a high-speed gear G ₄ and a low-speed gear G ₅ is slidably spline-fitted to the counter shaft O ₃ and provided near the transmission case. The speed can be switched among high speed, neutral, and low speed by the traveling auxiliary transmission lever 58.

That is, the high-low speed switching shifter gear 21 can mesh with the high-speed gear G ₆ and the low-speed gear G ₇ fixed to the left and right ends of the intermediate shaft O _4. through the constant mesh gear G ₈ which is fixed to an intermediate portion of the intermediate shaft O _4, power for driving the traveling output shaft O ₅ is transmitted by matching. G ₉ is fixed to the traveling output shaft O _5, is always engaged gear G ₈ meshing constant mesh gears.
In addition, a dog clutch gear is provided instead of the switching shifter gear 21 provided on the counter shaft O ₃ , and power is supplied by a clutch in which this gear is normally meshed with either the high speed gear G ₆ or the low speed gear G _7. It may be intermittent. It is mainly used for unicycle management machines.

[0021] One end portion of the traveling output shaft O ₅ protrudes from the right split case 6 to the outside, the sprocket S ₁ arranged on the traveling transmission case 4 at its projecting end is provided. When the switching shifter 21 moves to the neutral position, the power transmission input shaft 11 (O ₁ ) keeps rotating and the traveling transmission 10 stops operating and enters the free state. Accordingly, it becomes possible to manually push and pull the tiller to move it back and forth.

The HST 2 mounted on the outer surface of the left split case 7 includes a substrate 22 directly joined to the outer surface, and a continuously variable transmission penetrating the substrate 22 and extending in the same direction into the left split case 7. Input shaft O ₈ and output shaft O ₂ for continuously variable transmission
A hydraulic pump 23 and a hydraulic motor 24 disposed outside the substrate 22 around these axes O ₈ and O ₂ ;
It mainly comprises a case 25 which accommodates the hydraulic pump 23 and the hydraulic motor 24 and is integrally mounted on the substrate 22 while supporting the shafts O ₈ and O _2. Reference numeral 22 denotes a so-called integral type which is fixed by bolts or the like (not shown).

[0023] Specifically, the hydraulic pump 23 includes a cylinder block 26 fixed to the continuously variable transmission input shaft O _8, are arranged in a circular Chen form the axis around the block 26, a plurality of opening to the outside , A plunger 28 which is inserted into the hole 27 so as to be freely retractable, and a movable swash plate 29 which adjusts the stroke of each plunger 28 freely. As shown in FIG. 4, the head side of each plunger hole 27 can communicate with the high-pressure port 37a and the low-pressure port 38a of the oil circuit 36 formed in the substrate 22 or the like, for example, when the plunger hole 27 advances. The tilt angle of the movable swash plate 29 is continuously adjusted by a shift lever 30 and a fine adjustment shift knob 31 shown in FIGS. The forward / backward switching of the inclination is performed by the forward / backward travel switching lever 57.
Perform in.

On the other hand, the hydraulic motor 24 comprises a cylinder block 32 fixed to the continuously variable output shaft O ₂ , a plunger hole 33 similar to the above, which is arranged around the axis of the block 32 in a circular manner. Similarly, the plunger 34 includes a fixed swash plate (motor-rotating swash plate) 35 for making the stroke of each plunger 34 appear and retract. The head side of each plunger hole 33 also has a high-pressure port 37b of an oil circuit 36 formed in the substrate 22 or the like as shown in FIG.
And low pressure port 38b.

In the oil circuit 36, as shown in FIG. 4, the hydraulic pump 23 and the hydraulic motor 24 are connected by a high-pressure oil passage 37 and a low-pressure oil passage 38. Is provided with a common oil filter 39 and a trochoid pump 40 (FIG. 3), and is connected to the transmission case 1 also serving as an oil tank by an oil passage 42 (FIG. 3) communicating with the transmission case 1 so that oil is supplied. And an oil passage 4 provided with a relief valve 43.
4 allows excess oil to be released into the transmission case 1 when the pressure exceeds a certain level. Oil flows into the oil circuit 36 only when the movable swash plate 29 is tilted back and forth,
When neutral, the flow of oil in the oil circuit stops. 2 and 3, reference numeral 45 denotes a trochoid case, 46 denotes a suction port, 47 denotes a supply port, 48 denotes a pump chamber plate, and 49 denotes a pump chamber.

To reverse the output shaft O ₂ of the hydraulic motor 24, the swash plate 29 is moved to the opposite side, the flow in the oil circuit 36 is reversed, and the oil passage 38 is set to the high pressure side and the oil passage 37 Is on the low pressure side.

FIGS. 5 and 6 are a plan view and a side view of a single-wheel tiller equipped with the power transmission device described above.

In the drawing, reference numeral 50 denotes a handle, and the speed change lever 30 is provided near the left grip 51 so as to be connected to the movable swash plate 29 of the hydraulic pump of the HST 2 so as to roughly adjust the angle. In addition, the fine adjustment speed change knob 31 is provided near the left grip 51, and is similarly connected to the movable swash plate 29, and the fine angle adjustment thereof can be performed while holding the left grip 51 with the thumb. And so on.
Further, a main clutch lever 52 is provided on the left grip 51 so that the input shaft 11 of the power transmission device can be used.
The power to (O ₁ ) is interrupted. Specifically, a tension roller 54 that can freely contact the belt 53 that is wound around the pulley 65 and the pulley 3 of the engine 60 acts to adjust the degree of tension of the belt 53.

On the other hand, the right grip 5 of the handle 50
In the vicinity of 1, a clutch lever 55 connected to the rotary clutch ring 15 is provided so as to interrupt the power to the rotary 56.

In FIGS. 5 and 6, reference numeral 57 denotes a forward / reverse switching lever for traveling, which is an operation unit provided with a device for mechanically shifting the speed in addition to the shifting by the HST2. shift knob 31 and indirectly linked, which alter the forward and reverse direction of the movable swash plate 29, 58 is a traveling shifter gear 21 is slid to the left and right with respect to the counter shaft O ₃ in the sub-shift lever, high , To switch to low speed. When a fixed gear with a clutch is used instead of the shifter gear, reference numeral 58 denotes an auxiliary clutch lever.

[0031] In addition the figure, 59 is a rotary reverse rotation switching lever, which is a rotary 56 in tandem to a rotary positive reverse rotation shifter gear G ₁₁ in the working transmission 9 of the power transmission apparatus so as to forward and reverse rotation .

5 and 6, reference numeral 60 denotes an engine, 61 denotes an air cleaner, 62 denotes a muffler, 63 denotes wheels, and 64 denotes a resistance rod.

Next, the operation of the power transmission device for a single-wheel tiller having the above-described structure will be described. Now, assuming that the one-wheel tiller shown in FIG. 6 is used for plowing and tilling work in a field, the engine 60 is started, the main clutch lever 52 is gripped, and the main clutch 54 is connected. The power is transmitted to the power transmission input shaft 11 (O ₁ ) via the power transmission pulley 3 and is distributed from the input shaft 11 (O ₁ ) to the work transmission 9 and the traveling transmission 10 in FIG. .

In the working transmission 9, the power input from the transmission pulley 3 is transmitted through the shaft 11 (O
₁ ) → Gear G ₁ → Gear G ₁₀ → Axis O ₆ → Gear G ₁₁ → Gear G ₁₂
→ shifter 15 → shaft O ₇ → power of the forward rotation system via sprocket S ₄ , and shaft 11 (O ₁ ) → gear G ₁ → gear G
₁₀ → shaft O ₆ → sprocket S ₂ → chain C → sprocket S ₃ → shifter 15 → shaft O ₇ → the power is transmitted to the rotary 56 as the power of the reverse rotation system via the sprocket S ₄ .

On the other hand, in the traveling transmission 10, the power input from the transmission pulley 3 and transmitted in the order of the shaft O ₁ → the shaft O ₉ → the shaft O ₈ is continuously variable while passing through the HST 2. The shifting power is shaft O ₂ → gear G ₂ → gear G ₃ → shaft O ₃ → gear G
₄ → via gears G ₆ → shaft O ₄ → gear G ₈ → the gear G ₉ → shaft O ₅ → rapid system transmission gear train path formed in the order of the sprocket S _1, or, axial O ₂ → gear G ₂ → Gear G ₃ → Axis O ₃ → Gear G
₅ → Gear G ₇ → Shaft O ₄ → Gear G ₈ → Gear G ₉ → Shaft O ₅ → Sprocket S ₁ Runs as a forward or reverse rotation power via a low-speed transmission gear system path formed in this order. The power is transmitted to the wheels 63.

The power of the forward or reverse rotation at this time causes the forward / backward switching lever 57 for traveling shown in FIGS. 5 and 6 to tilt forward or backward, and is interlocked with the forward / backward switching lever. The angle of the pump movable swash plate 29 connected to the shift lever 30 that is high speed when pushed and becomes neutral (stopped) when fully pushed backward is roughly changed by the shift lever 30.
Further, by rotating the shift knob 31, the inclination angle can be obtained by finely changing the inclination angle.

Specifically, the shift lever 30 and the shift knob 3
As shown in FIG. 1, the pump movable swash plate 29 is arbitrarily changed in tilt angle for forward, neutral, and reverse movements by using a rotation axis (not shown) as an axis, and the HST is actuated as shown in FIG. Let it. Hereinafter, the operation of the HST will be described in detail.

In FIG. 1, when the pump shaft, that is, the continuously variable input shaft O ₈ rotates, the cylinder block 26 of the hydraulic pump 23 also rotates integrally therewith, and the plurality of plunger holes 27 of the cylinder block 26 Each of the inserted plungers 28 reciprocates.
The reciprocating stroke of No. 8 is determined by the inclination angle of the movable swash plate 29. For example, the amount of oil sent through the high pressure oil passage 37 when the hydraulic motor 24 to increase the oil flow rate of the pump as the inclination angle is large forward increases, the rotational speed is the motor axis or the continuously variable output shaft O ₂ Increase. The oil used for the rotation passes through the low-pressure oil passage 38 and the hydraulic motor 2
4 to the hydraulic pump 23 side.

At this time, the oil leaking from the HST 2 into the transmission case is supplied from the transmission case 1 to the hydraulic pump 23 via the oil filter 39 and the charge pump 40, while the excess oil sent by the charge pump 40 Is returned to the transmission case 1 via the relief valve 43 when the pressure becomes equal to or higher than a predetermined pressure.

The hydraulic pump shaft, ie, the continuously variable input shaft O ₈ , and the hydraulic motor shaft, ie, the continuously variable output shaft O _2, are also HST.
Since the oil is not exposed to the outside of the case 25 but protrudes only into the transmission case 1, all the oil transmitted therethrough is returned to the transmission case 1.

Since the swash plate 35 of the hydraulic motor 24 is fixed, when oil is guided from the hydraulic pump 23 side, the oil acts on the plunger 34 and presses the fixed swash plate 35 to press the swash plate 35. slide down the face, the operation of the slide down is to rotate the cylinder block 32 which accommodates the plunger 34, thus rotating the continuously variable transmission output shaft O ₂ which is fitted integrally with the cylinder block 32 .
The rotation speed increases as the oil amount increases.

[0042] Thus, the running wheel 63 for interlocking to the continuously variable transmission output shaft O ₂ will be traveling speed is changed to the continuously variable in HST2.

In the HST 2, the hydraulic pump 23 and the hydraulic motor 24 have exactly the same structure except for the movable swash plate 29 and the fixed swash plate 35, but the operations are exactly reversed. Accordingly, as described above, the high-pressure oil flows from the pump side to the motor side by the high-pressure oil, and the low-pressure oil returns from the motor side to the pump side. Therefore, in the hydraulic closed circuit, the swash plate 29
HST has a braking action when is neutralized. Therefore,
When moving the tiller manually back and forth, by the shifter gear 21 provided on the counter shaft O ₃ of the traveling speed change device 10 to the neutral, also to interrupt the clutch if the clutch with gear in place of the shifter gear 21 Thus, the tiller can be manually operated by making the wheels 63 free from the HST2. The manual operation of the cultivator in the free state is performed by HS compared to the case where the main clutch 54 is disconnected and the pulley 3 is set to the free state and the cultivator is manually operated.
Since the reaction force applied to T does not act, the operation is performed more lightly. In the above-described embodiment, the HST 2 is attached to the outer side surface of the left divided case 7, but the left divided case 7 itself may be formed into a structure having a space in which the HST 2 can be incorporated. If the HST 2 is incorporated in the left-side split case 7 formed in this way, all the sealing properties of the HST 2 are solved, and the sealing performance of the power transmission device as a whole is further improved, which greatly contributes to the prevention of oil leakage.

[0044]

As described above, according to the first aspect of the present invention, there is provided a traveling transmission device driven by a power transmission input shaft provided to project inward from the outside of one side surface of the transmission case. A power transmission device for a tiller having a work transmission, wherein a continuously variable transmission interposed between the power transmission input shaft and the traveling transmission device is provided on the other side surface of the transmission case; The input shaft and the output shaft of the transmission are projected in the same direction into the transmission case, and the input shaft of the continuously variable transmission and the power transmission input shaft are connected via an intermediate connecting device, and A power take-off shaft of the device is projected outward from the other side surface of the transmission case, and the power transmission input shaft and the power take-off shaft of the working transmission are directly connected without passing through the continuously variable transmission. On the other hand, the output shaft of the continuously variable transmission is connected to the traveling transmission device, and the diameter of the power transmission input shaft connected to the power take-out shaft is larger than the diameter of the input shaft of the continuously variable transmission. Because the power take-off shaft protrudes from the side of the same transmission case as the side where the continuously variable transmission is provided, the width of both sides of the transmission case can be reduced, and the power transmission input to both sides of the transmission case The shaft, the continuously variable transmission, and the power take-off shaft can be arranged in a well-balanced manner, and the tillage work can be facilitated. In addition, even if the conventional gear group for power distribution is removed from the power transmission input shaft, the power transmission input shaft is made thicker to increase rigidity so that it can withstand a large torque at the time of a shock from the work equipment. On the other hand, the diameter of the input shaft of the continuously variable transmission can be reduced so as to withstand a relatively small running torque as compared with the torque from the work implement, so that the overall structure of the continuously variable transmission can be reduced in size. Furthermore, when the continuously variable transmission is an HST, the input / output shaft of the HST protrudes toward the transmission case, so that the HST case has relatively few seal portions and oil leakage from the seal surface is reduced. As described above, according to the present invention, the overall structure of the power transmission device can be reduced in size while securing rigidity to withstand a large torque from the working machine, and the tillage operation can be facilitated.

According to the second aspect of the present invention, the power transmission input shaft and the continuously variable transmission input shaft are arranged on the same straight line as the intermediate connecting shaft connecting these two shafts. Powertrain) is simplified, and the shaft support structure is also simplified, which facilitates the machining of the transmission case and shaft, and reduces the number of parts such as shafts, bearings, and gears, thereby reducing manufacturing costs. You can also plan.

Further, according to the present invention, according to claim 3,
In a power transmission device of a tiller having a traveling transmission device driven by a power transmission input shaft provided in a transmission case and a work transmission, a continuously variable transmission is provided between the power transmission input shaft and the traveling transmission device. An output shaft of the continuously variable transmission, wherein an input shaft of the continuously variable transmission is connected to the power transmission input shaft, and protruded into the transmission case in the same direction as the continuously variable input shaft. , Traveling output shaft (O
₅ ) Since the power transmission device is provided in the traveling transmission device between the power transmission device and the power transmission input device, the power transmission input shaft is set to the free state, and the power is manually moved to the tiller. When making a ground turn, correcting the forward direction with a hand or arm, or attaching or detaching a wheel, if the continuously variable transmission is particularly an HST, the hydraulic circuit may be opened to return oil to the transmission case. The reaction force exerted on the output shaft of the HST by the remaining hydraulic pressure is not limited, and the power transmission device is switched from the HST to the free state by switching the power interrupting device to the disconnection state. The load of pushing and pulling can be reduced, and the headland turning and the maintenance of attaching / detaching the wheel by the forward / backward movement can be facilitated and the fatigue of the worker can be reduced.

In addition to the case where the continuously variable transmission is employed, according to the present invention, according to the fourth aspect, the traveling transmission device is provided on one of the input shaft and the output shaft of the continuously variable transmission.
Since the working transmission is provided on the other side, the number of traveling transmission gear groups can be greatly reduced, so that the width of the transmission case can be narrowed, and the management work between narrow-row crops is facilitated. Further, according to the present invention, according to claim 5, the structure can be made dense by providing a trochoid pump on the input shaft of the continuously variable transmission between the continuously variable transmission and the transmission case. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a power transmission device for a tiller according to the present invention.

FIG. 2 is a plan view showing a relationship between port shapes of a board and a trochoid case in the hydraulic pump.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a conceptual configuration diagram of an HST, which is a main part of the power transmission device.

FIG. 5 is a plan view of the single-wheel tiller having the power transmission device.

FIG. 6 is a side view of the single wheel tiller.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 transmission case 2 hydraulic continuously variable transmission (HST) 9 work transmission 10 traveling transmission (including traveling transmission) O ₁ (11) power transmission input shaft O ₂ hydraulic continuously variable transmission output shaft O ₈ Input shaft for hydraulic stepless shifting 21 Shift gear (power intermittent device)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-18726 (JP, A) JP-A-2-135335 (JP, U) JP-A-1-57965 (JP, U) (58) Investigation Field (Int.Cl. ⁶ , DB name) B60K 17/00 A01B 33/00

Claims (5)

(57) [Claims] 1. A power transmission device for a tiller having a traveling transmission device and a work transmission device driven by a power transmission input shaft provided to protrude inward from an outside of one side surface of a transmission case, A continuously variable transmission interposed between a power transmission input shaft and the traveling transmission device is provided on the other side surface of the transmission case, and an input shaft and an output shaft of the continuously variable transmission are arranged in the same direction in the transmission case. to protrude outside the said input shaft of the continuously variable transmission and the power transmission input shaft is connected via an intermediate coupling device, a power take-off shaft of the working transmission from the other side of the transmission case The power transmission input shaft and the power take-off shaft of the working transmission are directly connected without passing through the continuously variable transmission, while the output shaft of the continuously variable transmission is connected to the output shaft. A power transmission device for a tiller, wherein a diameter of the power transmission input shaft connected to the power take-off shaft is formed larger than a diameter of the input shaft of the continuously variable transmission. . 2. The power transmission input shaft, the continuously variable transmission input shaft, and a connection shaft of the intermediate connection device that connects these two shafts are arranged on the same straight line. Power transmission device of the tiller. 3. The outside of one side of the transmission case
Driven by the power transmission input shaft provided to protrude inside
Cultivating with driven transmission and working transmission
A power transmission device for an aircraft, wherein the power transmission input shaft is interposed between the power transmission input shaft and the traveling transmission device.
To the other side of the transmission case
And an input shaft of the continuously variable transmission is connected to the power transmission input shaft.
The transmission cable in the same direction as the input shaft of the continuously variable transmission.
The output shaft of the continuously variable transmission protruded into the
Force axis (O_FivePower intermittently mounted on the traveling transmission device between
A power take-off shaft of the working transmission,
OfSaidProtrude outward from the other side,The power transmission input shaft and a power take-off shaft of the working transmission
And directly connected without passing through the continuously variable transmission,  The diameter of the power transmission input shaft connected to the power take-out shaft is
The input shaft of the continuously variable transmissionDiameterFormed larger
And a power transmission device for a tiller. 4. The transmission according to claim 1, wherein the transmission is provided on one side of the input shaft and the output shaft of the continuously variable transmission, and the work transmission is provided on the other side. A power transmission device for a tiller according to claim 3. 5. The continuously variable transmission is a hydraulic continuously variable transmission, and a trochoid pump is provided on an input shaft of the continuously variable transmission between the continuously variable transmission and the transmission case. The power transmission device for a tiller according to claim 1 or 3, wherein