JP6948987B2 - Power transmission device and valve unit - Google Patents

Description

The present invention is configured to be able to transmit the power output from the power source to the left and right traveling devices, and is capable of turning the machine body by the speed difference between the left and right traveling devices, and the left and right traveling devices. It is used in a power transmission device that is equipped with left and right side clutches and multiple swivel clutches that switch between a power transmission state that transmits power to and a cutoff state that does not transmit power, and enables swivel by multiple types of swivel patterns. Regarding the valve unit.

A work machine that requires work on rough terrain, such as a combine harvester, is equipped with a pair of left and right crawler-type traveling devices, and the power output from the engine as a power source is transmitted to the left and right traveling devices by a power transmission device. It is configured to communicate.

As disclosed in Patent Document 1, the power transmission device can transmit the power input shaft into which the power of the engine is input and the power output from the power input shaft to the left side traveling device among the left and right traveling devices. A side clutch shaft in which a left side clutch mechanism and a right side clutch mechanism that can be transmitted to the right side traveling device among the left and right traveling devices are arranged, and a side clutch shaft that decelerates the power output from the power input shaft. A swivel clutch shaft with a wet multi-plate soft clutch mechanism that can transmit to the side clutch mechanism and a wet multi-plate spin clutch mechanism that can reverse the power output from the power input shaft and transmit it to the side clutch shaft, and soft It is equipped with a valve unit and the like capable of supplying and discharging hydraulic oil to the clutch mechanism and spin clutch mechanism.

JP-A-2009-78699

Such a power transmission device slides the friction plate group of the soft clutch mechanism or the friction plate group of the spin clutch mechanism when the aircraft turns, so that the speed difference relative to the left and right traveling devices is obtained. Therefore, there is a risk that the friction plate group of the soft clutch mechanism may be burnt out or the friction plate group of the spin clutch mechanism may be burnt out.

The present invention has been made in view of the above-mentioned problems, and provides a power transmission device and a valve unit capable of constantly cooling a friction plate group of a soft clutch mechanism and a friction plate group of a spin clutch mechanism. The purpose.

The characteristic configuration of the power transmission device according to the present invention for achieving the above object is such that the power output from the power source can be transmitted to the left and right traveling devices, and the vehicle body is configured by the speed difference between the left and right traveling devices. A power transmission device capable of turning the clutch, and the power input shaft into which the power of the power source is input and the power output from the power input shaft are transferred to the left side of the left and right traveling devices. The left side clutch mechanism that can be transmitted, the side clutch shaft in which the right side clutch mechanism that can be transmitted to the right side traveling device among the left and right traveling devices is arranged, and the power output from the power input shaft are decelerated. A wet multi-plate soft clutch mechanism capable of transmitting to the side clutch shaft and a wet multi-plate spin clutch mechanism capable of reversing the power output from the power input shaft and transmitting the power to the side clutch shaft are arranged. It has a swivel clutch shaft, a valve unit capable of supplying and discharging hydraulic oil discharged from a hydraulic pump to the soft clutch mechanism and the spin clutch mechanism, and a cooling oil passage formed in the swivel clutch shaft. A cooling mechanism capable of supplying cooling oil to the friction plate group of the soft clutch mechanism and the friction plate group of the spin clutch mechanism via the cooling oil passage is provided.

According to the above configuration, the cooling mechanism can always supply the cooling oil to the friction plate group of the soft clutch mechanism and the friction plate group of the spin clutch mechanism via the cooling oil passage. Since the friction plate group of the soft clutch mechanism and the friction plate group of the spin clutch mechanism are always cooled by the cooling oil that is always supplied, there is a risk of burning due to frictional heat generated by the friction plate group slipping when the aircraft turns. It will be reduced. The cooling mechanism may be dedicated, or for example, the valve unit may function as a cooling mechanism.

In the present invention, the valve unit is configured to supply and discharge hydraulic oil to the left side clutch mechanism and the right side clutch mechanism, and the hydraulic oil discharged from the hydraulic pump is supplied to the valve unit. A hydraulic circuit supplied to the left side clutch mechanism and the right side clutch mechanism, and an unload valve and a relief valve provided in the hydraulic circuit are provided, and the valve unit includes the unload valve and the relief valve. It is preferable that the hydraulic oil discharged from either one or both of the valves is configured to be supplied to the cooling oil passage as the cooling oil.

The hydraulic oil supplied to the left side clutch mechanism and the right side clutch mechanism is pressurized by the hydraulic pump. An unload valve and a relief valve are provided to protect the hydraulic circuit from the pressure of this hydraulic fluid. The unload valve is configured to put the hydraulic circuit in a no-load state when the oil pressure inside the hydraulic circuit exceeds a predetermined value, and the relief valve maintains the oil pressure inside the hydraulic circuit at the specified value. It is configured.

Therefore, the hydraulic oil discharged from the unload valve and the relief valve has a certain pressure. Then, since the hydraulic oil can be supplied to the cooling oil passage as the cooling oil by utilizing this hydraulic pressure, it is not necessary to separately provide a hydraulic pump for supplying the cooling oil. Since the valve unit can function as a cooling mechanism, the power transmission device can be miniaturized as a whole.

In the present invention, the left side clutch mechanism, the right side clutch mechanism, the soft clutch mechanism and the main body casing accommodating the spin clutch mechanism, and the unit casing accommodating the unload valve and the relief valve are provided. The unit casing is provided with a cavity having an opening, and is attached to the main body casing so that the opening is closed by the outer surface of the main body casing, and the cavity is formed by a partition wall. It is preferable that the oil chamber is divided into a first oil chamber and a second oil chamber.

According to the above configuration, the cavity provided in the unit casing can function as an oil chamber simply by attaching the valve unit to the main body casing, so that it is not necessary to provide a separate oil chamber, and thus power transmission is performed. The device can be miniaturized as a whole.

The hydraulic oil discharged from the hydraulic pump has a high pressure before being supplied to the left side clutch mechanism, the right side clutch mechanism, the soft clutch mechanism, and the spin clutch mechanism, and is discharged from the unload valve and the relief valve accordingly. The pressure of the hydraulic oil is also high.

On the other hand, the hydraulic oil discharged from the left side clutch mechanism, the right side clutch mechanism, the soft clutch mechanism, and the spin clutch mechanism has a low pressure.

If the valve unit is provided with only one oil chamber, the hydraulic oil discharged from the unload valve and the relief valve, the left side clutch mechanism, the right side clutch mechanism, the soft clutch mechanism, and the spin clutch Since the hydraulic oil discharged from the mechanism is collected in one of the oil chambers, the high pressure of the hydraulic oil discharged from the unload valve and the relief valve cannot be effectively used.

As described above, the pressure discharged from the left side clutch mechanism, the right side clutch mechanism, the soft clutch mechanism, and the spin clutch mechanism by partitioning the cavity into the first oil chamber and the second oil chamber by a partition wall. The low hydraulic oil can be recovered in one of the oil chambers, and the high pressure hydraulic oil discharged from the unload valve and the relief valve can be recovered in the other oil chamber. Therefore, the high pressure of the hydraulic oil discharged from the unload valve and the relief valve can be effectively utilized.

In the present invention, the hydraulic circuit includes a left side clutch valve that controls the supply and discharge of hydraulic oil to the left side clutch mechanism, and a right side clutch valve that controls the supply and discharge of hydraulic oil to the right side clutch mechanism. A swivel clutch valve for controlling the supply and discharge of hydraulic oil to the soft clutch mechanism and the spin clutch mechanism is provided, and the left side clutch valve, the right side clutch valve and the swivel clutch valve are provided in the first oil chamber. It is preferable that drain ports provided for each are connected, and drain ports provided for each of the unload valve and the relief valve are connected to the second oil chamber.

The low-pressure hydraulic oil discharged from the left side clutch mechanism, the right side clutch mechanism, the soft clutch mechanism, and the spin clutch mechanism is discharged to the first oil chamber. This hydraulic oil can be supplied to the main body casing as lubricating oil.

The hydraulic oil pressurized by the hydraulic pump of the valve unit is discharged to the second oil chamber via the unload valve and the relief valve. The hydraulic oil discharged into the second oil chamber can be supplied to the cooling oil passage as cooling oil for the friction plate group of the soft clutch mechanism and the friction plate group of the spin clutch mechanism.

In the present invention, one end of the side clutch shaft and one end of the swivel clutch shaft are configured to protrude from the main body casing, and the unit casing is such that one end of the side clutch shaft and the swivel clutch shaft. The hydraulic circuit is provided with a switching valve for switching between supply and discharge of hydraulic oil to the soft clutch mechanism and the spin clutch mechanism, and is provided with a left side clutch valve and a right side clutch valve. The swivel clutch valve, the switching valve, and the unload valve are composed of a direct acting multi-port solenoid valve and are configured so that the moving directions of the spools are parallel to each other. The right side clutch valve and the unload valve are arranged at a portion of the outer peripheral portion of the unit casing close to the one end portion of the side clutch shaft, and the swivel clutch valve and the switching valve are the unit. It is preferable that the valve is arranged at a portion of the outer peripheral portion of the casing close to the one end portion of the swivel clutch shaft.

By arranging each valve so that the movable directions of the spools provided in each valve are parallel to each other, it becomes easy to wire the feeding line to the solenoid provided in each valve. Further, since the mounting portion of each valve and each oil passage provided inside the unit casing can be easily arranged, the valve unit can be miniaturized as a whole. Even if any of the valves fails, only the failed valve can be replaced without removing the valve unit from the main body casing.

In the present invention, the hydraulic circuit is provided with a supply oil passage for supplying hydraulic oil after operating the left side clutch mechanism and the right side clutch mechanism to the swivel clutch valve, and the supply oil passage is provided. It is preferable that a filter is provided, an inspection port communicating with the supply oil passage is provided on the outer peripheral portion of the unit casing, and the filter is configured to be replaceable through the inspection port.

According to the above configuration, the filter can be replaced from outside the unit casing.

In the present invention, it is preferable that the partition wall is provided on either one or both of the unit casing and the main body casing.

According to the above configuration, the degree of freedom in how to prepare the partition wall is increased.

The characteristic configuration of the valve unit according to the present invention for achieving the above object is a plurality of left and right side clutches that switch between a power transmission state in which power is transmitted to the left and right traveling devices and a cutoff state in which power is not transmitted. A valve unit provided with a swivel clutch that enables swivel by a plurality of swivel patterns, and is a hydraulic circuit that supplies and discharges hydraulic oil to the left and right side clutches and the swivel clutch. An unload valve and a relief valve provided in the hydraulic circuit are provided, and a first oil chamber into which hydraulic oil flows after operating the left and right side clutches and the swivel clutch, and the unloading. The point is that the valve and the second oil chamber into which the hydraulic oil from the relief valve flows in are partitioned.

According to the above configuration, it is possible to provide a valve unit capable of constantly cooling the friction plate group of the soft clutch mechanism and the friction plate group of the spin clutch mechanism.

Longitudinal front view of power transmission device Explanatory drawing of hydraulic circuit Front view of valve unit FIG. 3 is a sectional view taken along line IV-IV. FIG. 3 is a sectional view taken along line VV. VI-VI line sectional view of FIG. Rear view of valve unit

Hereinafter, an embodiment of the power transmission device according to the present invention will be described with reference to the case where it is adopted in a conventional combine as an example of a harvester. It should be noted that the embodiments described below are all examples of the present invention, and the description does not limit the present invention, and the specific configuration of each part is appropriately set as long as the effects of the present invention are exhibited. It can be modified and designed.

〔overall structure〕
The body of a normal combine harvester that harvests rice, wheat, etc. is provided with left and right traveling devices, which can be raised and lowered with respect to the body, and as the combine advances, the grain in the field is raised and cut. The threshing department that receives the grain sent from the department and threshes it with a saw drum, and the threshed processed product sent from the threshing department are sorted by a sorting method such as specific gravity sorting, such as fir and straw. Each work part, each work part, such as a sorting part that separates the waste from the combine, a storage part that stores the fir sent from the sorting part, and a discharge part that discharges the fir stored in the storage part to the outside of the combine. It is equipped with an engine as a power source for the harvester, a transmission device for a harvester that transmits the power of the engine to each work unit, and a control unit on which a worker is on board to perform operation.

The transmission device for the harvester includes a belt-type transmission mechanism in which the power of the engine is input, a hydrostatic continuously variable transmission that continuously changes the power output from the belt-type transmission mechanism, and an output from the continuously variable transmission. The power transmission device 10 (see FIG. 1) and the like are provided so as to be configured to be able to transmit the generated power to the left and right traveling devices and to turn the aircraft by the speed difference between the left and right traveling devices.

[Power transmission device]
As shown in FIG. 1, the power transmission device 10 is provided with a power input unit 13 to which the output shaft 12 of the continuously variable transmission can be spline-coupled on the upper part of the main body casing 11. The power input unit 13 is composed of a power input shaft 14 pivotally supported by the main body casing 11, a high-speed gear 15 spline-coupled to the power input shaft 14, and a low-speed gear 16.

A transmission shaft 17 for auxiliary transmission, which is pivotally supported by the main body casing 11, is provided downstream of the power input shaft 14. The high-speed gear 18 and the low-speed gear 19 are arranged on the auxiliary transmission transmission shaft 17 so as to be relatively rotatable. The high-speed gear 15 and the high-speed gear 18 are engaged with each other, and the low-speed gear 16 and the low-speed gear 19 are engaged with each other.

A shifter 20 that can rotate integrally with the auxiliary transmission transmission shaft 17 by spline coupling between the high-speed gear 18 and the low-speed gear 19 and is slidable along the axial direction of the auxiliary transmission transmission shaft 17 is provided. ing. The shifter 20 is configured to be spline-coupled to the high-speed gear 18 and the low-speed gear 19 according to the position along the axial direction of the auxiliary transmission transmission shaft 17.

When the shifter 20 is slid toward the high-speed gear 18 and the shifter 20 and the high-speed gear 18 are spline-coupled, the rotation of the power input shaft 14 passes through the high-speed gear 15, the high-speed gear 18, and the shifter 20 and the transmission shaft 17 for auxiliary transmission. Is transmitted to.

When the shifter 20 is slid toward the low-speed gear 19 and the shifter 20 and the low-speed gear 19 are spline-coupled, the rotation of the power input shaft 14 passes through the low-speed gear 16, the low-speed gear 19, and the shifter 20, and the transmission shaft 17 for auxiliary transmission. Is transmitted to.

In this way, by switching the position of the shifter 20 between the state of meshing with the high-speed gear 18 and the state of meshing with the low-speed gear 19, the power of the power input shaft 14 is changed to two stages of high and low (high speed and low speed). It is transmitted to the auxiliary transmission transmission shaft 17.

On the auxiliary transmission transmission shaft 17, a straight-ahead transmission gear 21 and a turning transmission gear 22 are arranged so as to be integrally rotatable by spline coupling. The auxiliary transmission transmission shaft 17 is provided with a parking brake mechanism 23.

A side clutch shaft 30 and a swivel clutch shaft 60 pivotally supported by the main body casing 11 are provided downstream of the auxiliary transmission transmission shaft 17.

[Side clutch shaft]
The straight-ahead transmission gear 21 arranged on the auxiliary transmission transmission shaft 17 meshes with the side clutch shaft input gear 31 spline-coupled to the side clutch shaft 30, and the rotation of the power input shaft 14 causes the auxiliary transmission transmission shaft 17 to rotate. It is transmitted to the side clutch shaft 30 via the straight-ahead transmission gear 21 and the side clutch shaft input gear 31.

The power output from the power input shaft 14 is transmitted to the side clutch shaft 30 to the left side clutch mechanism 40 capable of transmitting the power output from the power input shaft 14 to the left side traveling device among the left and right traveling devices, and to the right traveling device among the left and right traveling devices. A possible right side clutch mechanism 50 is arranged. Since the power transmission device 10 is drawn so that the front side is the front surface of the machine body in FIG. 1, the left side clutch mechanism 40 is arranged on the right side and the right side clutch mechanism 50 is arranged on the left side. There is.

A left side output gear 32 and a right side output gear 33 are arranged on the side clutch shaft 30 so as to be relatively rotatable. The left output gear 32 meshes with the left transmission gear 24 that outputs power to the left traveling device, and the right output gear 33 meshes with the right transmission gear 25 that outputs power to the right traveling device.

[Left side clutch mechanism]
The left side clutch mechanism 40 is composed of a meshing clutch. The side clutch shaft 30 can rotate integrally with the side clutch shaft 30 to the right in FIG. 1 of the left output gear 32 by spline coupling, and is slidable along the axial direction of the side clutch shaft 30. A unit 41 is provided.

The left meshing portion 41 is urged by a spring 42 so as to mesh with the left side output gear 32. When the left meshing portion 41 meshes with the left side output gear 32, the rotation of the side clutch shaft 30 is transmitted to the left side traveling device via the left meshing portion 41 and the left side output gear 32. At this time, the left side clutch mechanism 40 is called an engaged state (power transmission state).

From the valve unit 90 attached to the left side surface (right side surface in FIG. 1) of the main body casing 11, the left side output gear 32 and the left meshing portion 41 pass through the supply oil passage 34 formed inside the side clutch shaft 30. By supplying hydraulic oil to the inside of the oil chamber 43 formed between the piston 44, the piston 44 moves to the right in FIG. 1, and the left meshing portion 41 opposes the urging force of the spring 42 to the right in FIG. Since it moves to, the engagement between the left output gear 32 and the left meshing portion 41 is released. At this time, the rotation of the side clutch shaft 30 is not transmitted to the left output gear 32 via the left meshing portion 41. At this time, the left side clutch mechanism 40 is referred to as an disengaged state (disengaged state). A predetermined amount or more of the hydraulic oil supplied to the oil chamber 43 is returned to the valve unit 90 via the return oil passage 36 formed inside the side clutch shaft 30.

When the supply of hydraulic oil to the oil chamber 43 is stopped, the left meshing portion 41 is moved to the left in FIG. 1 by the urging force of the spring 42, and the left meshing portion 41 and the left output gear 32 mesh with each other. Along with this, the piston 44 is also moved to the left in FIG. 1, so that the hydraulic oil is discharged from the oil chamber 43. This hydraulic oil is returned to the valve unit 90 via the supply oil passage 34.

[Right side clutch mechanism]
The right side clutch mechanism 50 is composed of a meshing clutch. The side clutch shaft 30 can rotate integrally with the side clutch shaft 30 by spline coupling to the left side of the right output gear 33 in FIG. 1, and has a right meshing that can slide along the axial direction of the side clutch shaft 30. A section 51 is provided.

The right meshing portion 51 is urged by a spring 52 so as to mesh with the right output gear 33. When the right meshing portion 51 meshes with the right output gear 33, the rotation of the side clutch shaft 30 is transmitted to the right traveling device via the right meshing portion 51 and the right output gear 33. At this time, the right side clutch mechanism 50 is referred to as an engaged state (power transmission state).

The hydraulic oil is supplied from the valve unit 90 to the inside of the oil chamber 53 formed between the right output gear 33 and the right meshing portion 51 via the supply oil passage 35 formed inside the side clutch shaft 30. As a result, the piston 54 moves to the left in FIG. 1, and the right meshing portion 51 moves to the left in FIG. 1 against the urging force of the spring 52, so that the engagement between the right output gear 33 and the right meshing portion 51 is released. Will be done. At this time, the rotation of the side clutch shaft 30 is not transmitted to the right output gear 33 via the right meshing portion 51. At this time, the right side clutch mechanism 50 is referred to as an disengaged state (disengaged state). A predetermined amount or more of the hydraulic oil supplied to the oil chamber 53 is returned to the valve unit 90 via the return oil passage 36 formed inside the side clutch shaft 30.

When the supply of hydraulic oil to the oil chamber 53 is stopped, the right meshing portion 51 is moved to the right in FIG. 1 by the urging force of the spring 52, and the right meshing portion 51 and the right output gear 33 mesh with each other. Along with this, the piston 54 is also moved to the right in FIG. 1, so that the hydraulic oil is discharged from the oil chamber 53. The hydraulic oil is returned to the valve unit 90 via the supply oil passage 35.

If both the left side clutch mechanism 40 and the right side clutch mechanism 50 are in the power transmission state, the aircraft travels straight. If either the left side clutch mechanism 40 or the right side clutch mechanism 50 is in the shutoff state, the aircraft turns and travels as described below.

[Swivel clutch shaft]
On the swivel clutch shaft 60, a soft clutch input gear 61 that meshes with an input relay gear 37 arranged on the outer peripheral portion of the right meshing portion 51 provided on the side clutch shaft 30 is arranged so as to be relatively rotatable.

[Soft clutch mechanism]
A wet multi-plate type soft clutch mechanism 70 capable of decelerating the power output from the power input shaft 14 and transmitting the power to the side clutch shaft 30 is arranged between the swivel clutch shaft 60 and the soft clutch input gear 61. ..

The soft clutch mechanism 70 is integrally provided with a clutch housing 71 and a soft clutch input gear 61 that can rotate integrally with the swivel clutch shaft 60 by spline coupling, and is a tubular shaft located between the swivel clutch shaft 60 and the clutch housing 71. 72, friction formed by alternately arranging a plurality of outer friction plates engaged with the clutch housing 71 in a relative non-rotatable manner and a plurality of inner friction plates engaged with the cylinder shaft 72 in a relative non-rotatable manner. A plate group 73, a piston 74 for pressing the friction plate group 73, a spring 75 for urging the piston 74 in a direction away from the friction plate group 73, and the like are provided.

The piston 74 is shown in FIG. 1 by supplying hydraulic oil from the valve unit 90 to the inside of the oil chamber 76 formed inside the clutch housing 71 via the supply oil passage 62 formed inside the swivel clutch shaft 60. As it moves to the left, the friction plate group 73 is pressed and slippage between the outer friction plate and the inner friction plate is restricted, so that the clutch housing 71 and the cylinder shaft 72 are in a power transmission state in which relative rotation is restricted. Become. The rotation of the soft clutch input gear 61 is transmitted to the swivel clutch shaft 60 via the cylinder shaft 72, the friction plate group 73, and the clutch housing 71. The hydraulic oil is supplied to the friction plate group 73 as cooling oil via the supply oil passage 62.

When the supply of hydraulic oil to the oil chamber 76 is stopped, the piston 74 is moved to the right in FIG. 1 by the urging force of the spring 75, the pressure of the friction plate group 73 is released, and the outer friction plate and the inner friction plate are released. The clutch housing 71 and the cylinder shaft 72 are in a cut-off state in which relative rotation is permitted. By moving the piston 74 to the right in FIG. 1, the hydraulic oil is discharged from the oil chamber 76. The hydraulic oil is discharged into the main body casing 11 via the supply oil passage 62.

[Spin clutch mechanism]
The turning transmission gear 22 provided on the auxiliary transmission transmission shaft 17 meshes with the spin clutch input gear 63 which is arranged so as to be relatively rotatable on the turning clutch shaft 60. Therefore, the rotation direction of the turning transmission gear 22 and the rotation direction of the spin clutch input gear 63 are opposite to each other.

A wet multi-plate type spin clutch mechanism 80 capable of reversing the power output from the power input shaft 14 and transmitting the power to the side clutch shaft 30 is arranged between the swivel clutch shaft 60 and the spin clutch input gear 63. ..

The spin clutch mechanism 80 is integrally provided on the clutch housing 81 and the spin clutch input gear 63 that can rotate integrally with the swivel clutch shaft 60 by spline coupling, and is a tubular shaft located between the swivel clutch shaft 60 and the clutch housing 81. 82, A friction plate group 83 in which a plurality of outer friction plates engaged with the clutch housing 81 in a relative non-rotatable manner and a plurality of inner friction plates engaged with the cylinder shaft 82 in a relative non-rotatable manner are alternately arranged. A piston 84 that presses the friction plate group 83, a spring 85 that urges the piston 84 in a direction away from the friction plate group 83, and the like are provided.

The piston 84 is shown in FIG. 1 by supplying hydraulic oil from the valve unit 90 to the inside of the oil chamber 86 formed inside the clutch housing 81 via the supply oil passage 64 formed inside the swivel clutch shaft 60. As it moves to the right, the friction plate group 83 is pressed and slippage between the outer friction plate and the inner friction plate is restricted, so that the clutch housing 81 and the cylinder shaft 82 are in a power transmission state in which relative rotation is restricted. Become. The rotation of the spin clutch input gear 63 is transmitted to the swivel clutch shaft 60 via the cylinder shaft 82, the friction plate group 83, and the clutch housing 81. The hydraulic oil is supplied to the friction plate group 83 as cooling oil via the supply oil passage 64.

When the supply of hydraulic oil to the oil chamber 86 is stopped, the piston 84 is moved to the left in FIG. 1 by the urging force of the spring 85, the pressure of the friction plate group 83 is released, and the outer friction plate and the inner friction plate are released. The clutch housing 81 and the cylinder shaft 82 are in a cut-off state in which relative rotation is permitted. By moving the piston 84 to the left in FIG. 1, the hydraulic oil is discharged from the oil chamber 86. This hydraulic oil is discharged into the main body casing 11 via the supply oil passage 64.

[Swivel output gear]
On the swivel clutch shaft 60, a swivel output gear 65 is integrally rotatably arranged between the clutch housing 71 and the clutch housing 81 by spline coupling. The turning output gear 65 is attached to an output relay gear 38 arranged so as to be relatively rotatable with the side clutch shaft 30 between the left output gear 32 and the right output gear 33 which are arranged so as to be relatively rotatable on the side clutch shaft 30. It is in mesh.

The power output via the soft clutch mechanism 70 or the spin clutch mechanism 80 is transmitted to the output relay gear 38 via the turning output gear 65.

A left-handed turning clutch mechanism 45 is provided between the output relay gear 38 and the left-hand output gear 32, and a right-handed turning clutch mechanism 55 is provided between the output relay gear 38 and the right-hand output gear 33.

Both the left-handed turning clutch mechanism 45 and the right-handed turning clutch mechanism 55 are composed of a wet multi-plate clutch mechanism. The left-handed turning clutch mechanism 45 and the right-handed turning clutch mechanism 55 are arranged so that a plurality of friction plate groups are close to each other, so that even if the supply of hydraulic oil is stopped, the half power transmission state is achieved. It is configured.

[Turn left]
When hydraulic oil is supplied from the valve unit 90 to the inside of the oil chamber 43 via the supply oil passage 34 formed inside the side clutch shaft 30, the oil chamber 46 provided in the left turning clutch mechanism 45 is also provided. The hydraulic oil is supplied, the sliding of the plurality of friction plates is regulated, and the left-handed clutch mechanism 45 is in the power transmission state.

At this time, as described above, since the left side clutch mechanism 40 is in the disconnected state, power is not transmitted to the left output gear 32 via the left meshing portion 41.

However, power from the soft clutch mechanism 70 or the spin clutch mechanism 80 can be transmitted to the left side output gear 32 via the turning output gear 65, the output relay gear 38, and the left turning clutch mechanism 45. Therefore, a lower speed power or a power in the opposite direction is transmitted to the left output gear 32 than when the power is transmitted through the left meshing portion 41, and the airframe makes a slow turn or a super-credit turn to the left.

[Turn right]
When hydraulic oil is supplied from the valve unit 90 to the inside of the oil chamber 53 via the supply oil passage 35 formed inside the side clutch shaft 30, the oil chamber 56 provided in the right-hand clutch mechanism 55 is provided. Also, hydraulic oil is supplied, slippage of a plurality of friction plate groups is restricted, and the right-handed clutch mechanism 55 is in a power transmission state.

At this time, as described above, since the right side clutch mechanism 50 is in the disconnected state, power is not transmitted to the right output gear 33 via the right meshing portion 51.

However, power from the soft clutch mechanism 70 or the spin clutch mechanism 80 can be transmitted to the right output gear 33 via the turning output gear 65, the output relay gear 38, and the right turning clutch mechanism 55. Therefore, the right output gear 33 is transmitted with a lower speed power or a power in the opposite direction than when the power is transmitted through the right meshing portion 51, and the airframe makes a slow turn or a super-credit turn to the right.

A hydraulic pump 26 (see FIG. 2) driven by power output from the output shaft 12 of the continuously variable transmission is attached to the main body casing 11. The hydraulic pump 26 is configured to suck the lubricating oil stored inside the main body casing 11 and supply it to the valve unit 90 as hydraulic oil.

〔Valve unit〕
The valve unit 90 is provided with left and right side clutches and a plurality of swivel clutches for switching between a power transmission state in which power is transmitted to the left and right traveling devices and a cutoff state in which power is not transmitted, and swivels according to a plurality of types of swivel patterns. It is used in the power transmission device 10 that enables the hydraulic oil discharged from the hydraulic pump 26 in the present embodiment, as shown in FIGS. 2 to 7, the left side clutch mechanism 40 and the right side clutch. Each of the mechanism 50, the soft clutch mechanism 70, the spin clutch mechanism 80, the left turning clutch mechanism 45, and the right turning clutch mechanism 55 is provided with a hydraulic circuit 92 for supplying and discharging.

The hydraulic circuit 92 includes a left side clutch valve V1 that controls the supply and discharge of hydraulic oil to the left side clutch mechanism 40, a right side clutch valve V2 that controls the supply and discharge of hydraulic oil to the right side clutch mechanism 50, and a soft clutch mechanism. A swivel clutch valve V3 that controls the supply and discharge of hydraulic oil to the 70 and the spin clutch mechanism 80, a switching valve V4 that switches the supply and discharge of hydraulic oil to the soft clutch mechanism 70 and the spin clutch mechanism 80, and the inside of the hydraulic circuit 92. An unload valve V5 that puts the hydraulic circuit 92 in a no-load state when the oil pressure becomes a predetermined value or more, and a relief valve V6 that maintains the oil pressure inside the hydraulic circuit 92 at a specified value are provided.

In particular, the left side clutch valve V1, the right side clutch valve V2, the swivel clutch valve V3, the switching valve V4, and the unload valve V5 are composed of a direct acting multi-port solenoid valve. The operation of each valve is controlled by a control device (not shown).

As shown in FIG. 1, one end of the side clutch shaft 30 and one end of the swivel clutch shaft 60 are configured to protrude from the main body casing 11, and as shown in FIGS. 4 and 6, each of the valve units 90. The unit casing 91 accommodating the valve is arranged so as to straddle one end of the side clutch shaft 30 and one end of the swivel clutch shaft 60.

The unit casing 91 is manufactured by casting, and includes mounting portions for the left side clutch valve V1, right side clutch valve V2, swivel clutch valve V3, switching valve V4, and unload valve V5 described above, and oils described below. The path is formed by cutting.

As shown in FIGS. 3 to 7, the movable directions of the spools of the left side clutch valve V1, the right side clutch valve V2, the swivel clutch valve V3, the switching valve V4, and the unload valve V5 are parallel to the unit casing 91. It is arranged so as to be.

The left side clutch valve V1, the right side clutch valve V2, and the unload valve V5 are arranged at a portion of the outer peripheral portion of the unit casing 91 near the insertion portion 93 at one end of the side clutch shaft 30. Therefore, it is easy to wire the feed line to each solenoid provided in the left side clutch valve V1, the right side clutch valve V2, and the unload valve V5.

The swivel clutch valve V3 and the switching valve V4 are arranged at a portion of the outer peripheral portion of the unit casing 91 near the insertion portion 94 at one end of the swivel clutch shaft 60. Therefore, it is easy to wire the feed line to each solenoid provided in the swivel clutch valve V3 and the switching valve V4.

Further, since the mounting portion of each valve and the arrangement of the oil passages provided inside the unit casing 91 can be easily arranged, the valve unit 90 can be miniaturized as a whole. Even if any of the valves fails, only the failed valve can be replaced without removing the valve unit 90 from the main body casing 11.

The unit casing 91 is provided with a cavity C having an opening, and is attached to the main body casing 11 so that the opening is closed by the outer surface of the main body casing 11. The cavity C is divided into a first oil chamber C1 and a second oil chamber C2 by a partition wall 95 (see FIG. 7) integrally provided in the unit casing 91.

Since the cavity C provided in the unit casing 91 can function as the first oil chamber C1 and the second oil chamber C2 simply by attaching the valve unit 90 to the main body casing 11, a dedicated oil chamber is provided separately. Since it is not necessary, the power transmission device 10 can be miniaturized as a whole.

The unit casing 91 is provided with an input unit 99 for hydraulic oil discharged from the hydraulic pump 26.

As shown in FIGS. 2, 4, and 6, the unit casing 91 has input ports of the left side clutch valve V1, the right side clutch valve V2, the unload valve V5, and the relief valve V6 from the input unit 99. An input oil passage L1 for supplying hydraulic oil to P1, P2, P5, and P6 is provided.

As shown in FIGS. 2 and 6, the supply / discharge port A1 of the left side clutch valve V1 is formed on the side clutch shaft 30 at the insertion portion 93 at one end of the side clutch shaft 30 provided in the unit casing 91. It communicates with the oil supply / discharge passage L2 for supplying / discharging hydraulic oil to the supply oil passage 34. The drain port T1 of the left side clutch valve V1 communicates with the first oil chamber C1 via the drain oil passage L3.

As shown in FIGS. 2 and 5, the supply / discharge port A2 of the right side clutch valve V2 is formed on the side clutch shaft 30 at the insertion portion 93 at one end of the side clutch shaft 30 provided in the unit casing 91. It communicates with the oil supply / discharge passage L4 for supplying / discharging hydraulic oil to the supply oil passage 35. The drain port T2 of the right side clutch valve V2 communicates with the first oil chamber C1 via the drain oil passage L5.

Further, as shown in FIG. 6, in the insertion portion 93, the supply oil passage L6 for receiving the hydraulic oil from the return oil passage 36 formed in the side clutch shaft 30 communicates with the insertion portion 93. As shown in FIGS. 2 and 5, the supply oil passage L6 communicates with the input port P3 of the swivel clutch valve V3.

As shown in FIGS. 2 and 5, the supply oil passage L6 is provided with a filter 96. An inspection port 97 communicating with the supply oil passage L6 is provided on the outer peripheral portion of the unit casing 91. The inspection port 97 is sealed by a removable cap 98. The filter 96 is configured to be replaceable from the outside of the unit casing 91 via the inspection port 97.

As shown in FIGS. 2 and 5, the output port A3 of the swivel clutch valve V3 communicates with the supply oil passage L7, and hydraulic oil is supplied to the input port P4 of the switching valve V4 via the supply oil passage L7. The drain port T3 of the swivel clutch valve V3 communicates with the first oil chamber C1 via the drain oil passage L8.

As shown in FIGS. 2 and 4, the output port A4 of the switching valve V4 is a supply oil passage formed in the swivel clutch shaft 60 at the insertion portion 94 at one end of the swivel clutch shaft 60 provided in the unit casing 91. It communicates with the supply oil passage L9 that supplies hydraulic oil to 62.

As shown in FIGS. 2 and 4, the output port B4 of the switching valve V4 is a supply oil passage formed in the swivel clutch shaft 60 at the insertion portion 94 at one end of the swivel clutch shaft 60 provided in the unit casing 91. It communicates with the supply oil passage L10 that supplies hydraulic oil to 64.

As described above, the first oil chamber C1 has a drainage passage L3 communicating with the drain port T1 provided on the left side clutch valve V1 and a drainage passage communicating with the drain port T2 provided on the right side clutch valve V2. The drain port L8 connected to L5 and the drain port T3 provided in the swivel clutch valve V3 is connected.

As shown in FIG. 2, a drain port 27 communicating with the first oil chamber C1 is provided on the side surface of the main body casing 11, and the hydraulic oil discharged to the first oil chamber C1 is delivered to the main body through the drain port 27. It is discharged to the inside of the casing 11 and used as a lubricating oil.

As shown in FIGS. 2 and 4, a discharge oil passage L11 communicating with an output port A5 (and a drain port T5) provided in the unload valve V5 is connected to the second oil chamber C2, and is connected to the discharge oil passage L11. Is communicated with the drain port L12 connected to the drain port T6 provided in the relief valve V6.

The second oil chamber C2 is separated from the main body casing 11 by a sealed bearing portion of the swivel clutch shaft 60. The cooling oil passage 66 formed inside the swivel clutch shaft 60 has an open end formed inside the second oil chamber C2. The hydraulic oil in the second oil chamber C2 is supplied to the cooling oil passage 66 from the open end.

When the aircraft travels straight, almost all of the hydraulic oil discharged from the hydraulic pump 26 is supplied to the second oil chamber C2 from at least one or both of the unload valve V5 and the relief valve V6. Even when the airframe is turning, a part of the hydraulic oil discharged from the hydraulic pump 26 is supplied to the second oil chamber C2 from either one or both of the unload valve V5 and the relief valve V6.

At least a part of the high hydraulic oil discharged from the hydraulic pump 26 is always supplied to the second oil chamber C2, and this hydraulic oil is formed as cooling oil inside the swivel clutch shaft 60 from the open end. It is supplied to the friction plate group 73 of the soft clutch mechanism 70 and the friction plate group 83 of the spin clutch mechanism 80 through the cooling oil passage 66. As a result, the friction plate group 73 of the soft clutch mechanism 70 and the friction plate group 83 of the spin clutch mechanism 80 are not limited to when the soft clutch mechanism 70 and the spin clutch mechanism 80 are in the power transmission state, but also when they are in the cutoff state. Even if there is, it is always cooled. The risk of burning due to frictional heat generated by the slippage of the friction plate group 73 and the slippage of the friction plate group 83 when the airframe is turning is reduced.

As described above, the valve unit 90 is configured to function as a cooling mechanism that supplies the hydraulic oil discharged from either or both of the unload valve V5 and the relief valve V6 as cooling oil to the cooling oil passage 66. Has been done. The cooling mechanism may be a dedicated cooling mechanism provided separately from the valve unit 90.

In the above-described embodiment, the case where the partition wall 95 is integrally provided with the unit casing 91 has been described, but the present invention is not limited to this. The partition wall 95 may be provided integrally with the main body casing 11, or may be provided in each of the unit casing 91 and the main body casing 11. Further, the partition wall 95 may be separately provided on either one or both of the unit casing 91 and the main body casing 11.

In the above-described embodiment, the case where the power transmission device according to the present invention is adopted for a normal type combine has been described, but the harvester may be a self-removing combine, and in addition to the combine, a corn harvester or the like may be used. It can be applied to various harvesters.

10: Power transmission device 11: Main body casing 14: Power input shaft 26: Hydraulic pump 30: Side clutch shaft 40: Left side clutch mechanism 50: Right side clutch mechanism 60: Swivel clutch shaft 66: Cooling oil passage 70: Soft clutch mechanism 73: Friction plate group 80: Spin clutch mechanism 83: Friction plate group 90: Valve unit 91: Unit casing 92: Hydraulic circuit 95: Partition 96: Filter 97: Inspection port C: Cavity part C1: First oil chamber C2: No. Two oil chambers L6: Supply oil passage T1: Drain port T2: Drain port T3: Drain port T5: Drain port T6: Drain port V1: Left side clutch valve V2: Right side clutch valve V3: Swing clutch valve V4: Switching valve V5 : Unload valve V6: Relief valve

Claims (8)

It is a power transmission device that is configured to be able to transmit the power output from the power source to the left and right traveling devices, and can turn the aircraft by the speed difference between the left and right traveling devices.
A power input shaft into which the power of the power source is input, and
A left side clutch mechanism capable of transmitting the power output from the power input shaft to the left side traveling device among the left and right traveling devices, and a right side clutch mechanism capable of transmitting the power output from the left and right traveling devices to the right side traveling device. With the side clutch shaft where
A wet multi-plate soft clutch mechanism capable of decelerating the power output from the power input shaft and transmitting it to the side clutch shaft, and reversing the power output from the power input shaft and transmitting it to the side clutch shaft. A swivel clutch shaft with a possible wet multi-plate spin clutch mechanism,
A valve unit capable of supplying and discharging hydraulic oil discharged from a hydraulic pump to the soft clutch mechanism and the spin clutch mechanism.
A cooling mechanism having a cooling oil passage formed on the swivel clutch shaft and capable of supplying cooling oil to the friction plate group of the soft clutch mechanism and the friction plate group of the spin clutch mechanism via the cooling oil passage. Power transmission device equipped with. The valve unit is configured to supply and discharge hydraulic oil to and from the left side clutch mechanism and the right side clutch mechanism.
A hydraulic circuit that supplies the hydraulic oil discharged from the hydraulic pump to the valve unit to the left side clutch mechanism and the right side clutch mechanism, and an unload valve and a relief valve provided in the hydraulic circuit Be prepared,
The first aspect of claim 1, wherein the valve unit is configured to supply hydraulic oil discharged from either one or both of the unload valve and the relief valve to the cooling oil passage as the cooling oil. Power transmission device. A main body casing accommodating the left side clutch mechanism, the right side clutch mechanism, the soft clutch mechanism, and the spin clutch mechanism.
A unit casing for accommodating the unload valve and the relief valve is provided.
The unit casing is provided with a cavity having an opening, and is attached to the main body casing so that the opening is closed by the outer surface of the main body casing.
The power transmission device according to claim 2, wherein the cavity is divided into a first oil chamber and a second oil chamber by a partition wall. The hydraulic circuit includes a left side clutch valve that controls the supply and discharge of hydraulic oil to the left side clutch mechanism, a right side clutch valve that controls the supply and discharge of hydraulic oil to the right side clutch mechanism, and the soft clutch mechanism. A swivel clutch valve that controls the supply and discharge of hydraulic oil to the spin clutch mechanism is provided.
Drain ports provided in each of the left side clutch valve, the right side clutch valve, and the swivel clutch valve are connected to the first oil chamber.
The power transmission device according to claim 3, wherein drain ports provided for each of the unload valve and the relief valve are connected to the second oil chamber. One end of the side clutch shaft and one end of the swivel clutch shaft are configured to protrude from the main body casing.
The unit casing is arranged so as to straddle one end of the side clutch shaft and one end of the swivel clutch shaft.
The hydraulic circuit is provided with a switching valve for switching between supply and discharge of hydraulic oil to the soft clutch mechanism and the spin clutch mechanism.
The left side clutch valve, the right side clutch valve, the swivel clutch valve, the switching valve, and the unload valve are composed of a direct acting multi-port solenoid valve, and the spools can move in parallel directions. Is configured to be
The left side clutch valve, the right side clutch valve, and the unload valve are arranged at a portion of the outer peripheral portion of the unit casing close to the one end portion of the side clutch shaft.
The power transmission device according to claim 4, wherein the swivel clutch valve and the switching valve are arranged at a portion of the outer peripheral portion of the unit casing close to the one end portion of the swivel clutch shaft. The hydraulic circuit is provided with a supply oil passage for supplying hydraulic oil after operating the left side clutch mechanism and the right side clutch mechanism to the swivel clutch valve.
A filter is provided in the supply oil passage.
An inspection port communicating with the supply oil passage is provided on the outer peripheral portion of the unit casing.
The power transmission device according to claim 4 or 5, wherein the filter is configured to be replaceable via the inspection port. The power transmission device according to any one of claims 3 to 6, wherein the partition wall is provided on either one or both of the unit casing and the main body casing. Power transmission that enables turning by multiple types of turning patterns equipped with left and right side clutches and multiple turning clutches that switch between a power transmission state that transmits power to the left and right traveling devices and a cutoff state that does not transmit power A valve unit used in a device
A hydraulic circuit that supplies and discharges hydraulic oil to the left and right side clutches and the swivel clutch,
An unload valve and a relief valve provided in the hydraulic circuit are provided.
The first oil chamber into which the hydraulic oil flows after operating the left and right side clutches and the swivel clutch, and the second oil chamber into which the hydraulic oil from the unload valve and the relief valve flow in are partitioned. Valve unit.

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