JPH0725254A - Cooling system for traveling transmission gear - Google Patents

Abstract

PURPOSE:To effect effective the cooling of a transmission case and to prevent any overheating from occurring by installing an air cooling fan in a pulley shaft part of the transmission case containing a power transmission system, in a device which is equipped with a planetary gear transmission system and a continuously variable speed belt transmission system. CONSTITUTION:In a traveling transmission case 2 of a combine, an input shaft 1 and a shift shaft 4 are bearing-supported on the upper part and a countershaft 15, a steering clutch shaft 6 and symmetrical traveling shafts 7 on the lower part, respectively, and likewise two split type shift pulleys 11 and 12 are bearing- supported on both pulley shaft parts 1B and 4B at each one side end of the input shaft 1 and the shift shaft 4, while a continuously variable transmission belt 13 is installed in space between both these pulleys 11 and 12. In this case, a fin strip air cooling fan 64 is integrally formed on the sidepiece, etc., of these pulleys 11 and 12, and an air flow is produced in a belt case 16 by dint of rotation of these pulleys 11, 12, and cooling air inhaled from a vent hole 65 is circulated around, whereby a transmission case 8 is cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention can be used as a traveling power transmission device for combine harvesters, tractors, seedling planting machines, transport vehicles, and the like. The present invention relates to a traveling transmission device configured by combining a planetary gear mechanism and a continuously variable transmission belt.

[0002]

2. Description of the Related Art In traveling operation such as combine operation, a hydraulic continuously variable transmission is used to make the control shaft single in order to facilitate the gear changing operation and the reversing operation. The gear shift lever was used to shift gears from the neutral position to the forward position or the reverse position.However, the hydraulic continuously variable transmission is a heavy load, and the transmission horsepower loss also occurs, though the shifting operation is easy. There was a big drawback. Moreover, the planetary gear transmission system A and the continuously variable transmission belt transmission system B generate a large amount of frictional heat, and the mission case is easily overheated.

[0003]

SUMMARY OF THE INVENTION According to the present invention, power is transmitted from an input shaft 1 by a planetary gear transmission system A and a continuously variable transmission belt transmission system B, and a continuously variable transmission belt transmission system B is continuously variable by a transmission lever 32. In a traveling transmission device that continuously changes the output traveling shaft 7 from a neutral N to a forward rotation F and a reverse rotation R by shifting, a pulley shaft portion 1B of a mission case 8 in which the planetary gear transmission system A and the continuously variable transmission belt transmission system B are installed. , 4B is provided with an air cooling fan 64.

[0004]

Action and Effect of the Invention A planetary gear transmission system A provided in the transmission case 2 between the input shaft 1 and the output traveling shaft 7.
Since the continuously variable transmission belt transmission system B is provided, the structure is simple, and the size and weight can be reduced. Moreover, with respect to the constant rotation of the planetary gear transmission system A, the rotation of the traveling output shaft 7 is changed from the neutral N to the normal rotation F side high speed, to the reverse rotation R side high speed by the continuously variable transmission of the continuously variable transmission belt transmission system B. It is possible to continuously change the speed continuously, and a single operation lever can be used to
A change and a continuously variable shift can be easily performed.

Since the air-cooling fan 64 is rotated integrally with the pulley shaft portion 1B or 4B of the continuously variable transmission belt transmission system B as described above, the mission case 8 is cooled by the airflow of the air-cooling fan 64 to prevent overheating. Can be prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A combine traveling mission case 2 has a split portion in the left and right axial direction, and has an upper portion bearing an input shaft 1 and a transmission shaft 4, and a lower portion having an intermediate shaft 15, a steering clutch shaft 6, and a left and right shaft. Bearings the traveling shaft 7 of. Of these, the pulley shaft portions 1B and 4B are provided at one end of the input shaft 1 and the speed change shaft 4, and the belt case 16 is provided so as to be openable and closable to provide the continuously variable speed belt 1
3 and the split-type speed change pulleys 11 and 12 for stretching the same are accommodated.

At the outer end of the input shaft 1, there is provided a pulley 17 for transmitting a belt 39 from the engine E side, a power take-off pulley 18 for transmitting a cutting device by a belt, and the like.
A drive gear 9 is provided in the device 9. In the belt case 16 of the input shaft 1, a pulley shaft portion 1B is detachably connected by spline fitting and has a split pulley 11.
Further, the transmission shaft 4 has a ring gear 10 which is rotated by meshing with the drive gear 9 in a gear case 19 portion.
The carrier 14 of the planetary gear 20 that meshes with the inside of the
The carrier 14 and the transmission gear 22 and the like which are integrally rotated via the shaft 21 of the planetary gear 20 are axially mounted, and the belt case 1
The 6th section has a pulley shaft section 4B which can be attached to and detached from the speed change shaft 4 by spline fitting, and a split pulley 12 is provided.

Split shafts of these pulley shaft portions 1B and 4B
The pulleys 11 and 12 have a configuration in which the split pulley interval in each axial direction, that is, the pulley diameter can be changed, and the transmission by the belt 13 wound around these can be changed. Further, the speed change shaft 4 is changed by the continuously variable speed change belt 13, and the sun gear 3 rotates integrally, but the ring gear 10, the carrier 14, the speed change gear 22 and the like are rotatably provided. ing.

The transmission gear 22 is provided in the gear case 19 portion.
A rotatable ring gear 24 can be interlockedly rotated on the steering clutch shaft 6 via an intermediate gear 23 on the intermediate shaft 15 that meshes with the. The steering clutch 5 is provided on both left and right sides of the ring gear 24.
Is operated by a shifter arm 25 to be turned on and off, and a wheel gear 26 that meshes with a gear portion of the steering clutch 5
The left and right traveling shafts 7 are configured to be transmitted via.

In order to change the speed of the continuously variable transmission belt 12, a rod 29 connects between arms 27 and 28 having cams 37 and 38 for axially moving the pulleys 11 and 12, and either one of them is connected. The arm 28 is interlocked with a bell crank shaft 31 that is rotatably supported by the transmission case 8 via a rod 30 having a universal joint, and is returned by rotating the shift lever 32 in the front-rear direction. The configuration is such that a continuously variable shift operation can be performed via the spring 33, the interlocking arm 34, the rod 35, and the like. 6
Numerals 2, 63 are cam rollers which are rotatable at fixed positions for sliding the cams 37, 38.

The transmission of travel is performed by driving the input shaft 1 while shifting the pulleys 11 and 12 by the shift lever 32 while shifting the sun gear 3 against the ring gear 10 which is rotating at a constant speed.
The speed can be changed from neutral N to forward F high speed range, and vice versa by reverse rotation R range, but when reverse driving or engine braking is applied from the traveling shaft 7 side like downhill. In the engaged state of the steering clutch 5, the speed change gear 22 of the planetary gear mechanism 2 and the carrier 14 are reversely driven from the traveling shaft 7 side, so that the planetary gear 20 is revolved around the carrier 14. , Input shaft 1, continuously variable transmission belt 1
3, the sun gear 3 is meshed between the ring gear 10 that does not move through the speed change shaft 4 and the like, and the revolution is restricted. Therefore, internal braking is performed and reverse drive is braked. Particularly, when the tension clutch pulley 40 to the input pulley 17 by the belt 39 is disengaged and the input shaft 1 is not driven, the continuously variable transmission belt 13 is not rotated, so that the sun gear 3 side from the carrier 14 is removed. The drive is not performed even if it is tried to be driven in the reverse direction.

36 is a gear case 19 and a belt case 16
Is a partition wall for partitioning between the input shaft 1 and the speed change shaft 4. The air-cooled fan 64 is the pulley shaft 1B.
Of the pulley 11, the side surface of the pulley 12 of the pulley shaft 4B, and the like are integrally formed into a fin shape, and the rotation of these pulleys 11 and 12 can cause wind inside the belt case 16. A ventilation port 65 is provided to allow cooling air to pass through the inside of the belt case 16. By the continuously variable transmission belt transmission, the outside air passes through the inside of the belt case 16 by the rotation of the air cooling fans 64, so that the mission case 8 can be air cooled.

An example of a combine having such a traveling transmission will be described. A sprocket 41 driven by the pair of left and right traveling shafts 7, an intermediate roller 42, and an end roller 43 bridge a crawler 44. The transmission case 8 is provided in the front part of a chassis 45 having a pair of left and right crawlers 44, and is transmitted by a belt 39 and a tension clutch pulley 40 from an engine E mounted below the lateral control seat 46. sell. The continuously variable transmission belt 13
The shift lever 32 for shifting the gears is provided on the control base 47 on the side of the cockpit 46, and is operated to rotate in the front-rear direction to move continuously from the neutral position to the forward forward F position as continuously variable speed at forward speed. It is possible to perform reverse speed change without notice as the rearward reverse R position is operated. Further, a power steering bar 48 is provided on the control base 47, and the steering clutch 5 and the shifter arm 25 of the steering brake are operated by tilting the power steering lever 48 to the left and right, and the harvesting device is tilted forward and backward. The configuration is such that 49 can be operated to move up and down.

The mowing device 49 has a mowing frame 50, a mowing blade device 51, a grain culm raising device 52, a grain stalk scraping device 53, a conveying device 54 for conveying the slaughter grain culm, and the like.
A hydraulic shaft is provided between the chassis 45 and the mowing frame 50 by fitting a support shaft 55 at the rear end of the frame 50 into a mowing support metal 56 on the mission case 8 so as to be vertically rotatable. The cylinder 60 is configured to control the raising and lowering of the reaping device 49.

A threshing device 58, which holds the grain culm transported by the transporting device 54 between the feed chain 57 and a sling and transports it backward while threshing, is mounted on the rear part of the chassis 45. The transmission of the belt 39 from the engine E to the input pulley 17 is performed by the planetary gear mechanism 2 provided on the transmission shaft 4 which is the second shaft next to the input shaft 1. The diameter of the groove 17 can be reduced, and the mission case can be made compact so that the left and right crawlers 44 and the like can be brought closer to the inside.

The input shaft to the reaping device 49 is located at the support shaft 55, and a belt is provided between the pulley 59 fixed to the cockpit 46 side and the power take-off pulley 18 of the input shaft 1. Being transmitted. Since the pulleys 59 and 18, the input pulley 17 from the engine E, the bell crank shaft 31 for gear shift operation of the continuously variable transmission belt 13 and the like are provided on the side of the control stand 47, It is easy to open and close the belt case 16 portion of the mission case 8 from the outside.

In FIG. 7, the difference from the above example is that the pulley shaft 4B is extended to the outside of the belt case 16, an air cooling fan 64 is attached, and air is blown to the outer surface of the mission case 8 by driving the air cooling fan 64. And cool.
In FIG. 8, the difference from the above example is that an air cooling fan 64 is provided at the outer end of the pulley shaft 4B, and a wind pipe 67 is formed outside from the bearing portion 66 of the pulley shaft 4B of the belt case 16. An air cooling fan 64 is located in 67.
Further, a ventilation port 65 covered with a filter 68 is provided on the outer peripheral portion of the belt case 16 so that the cooling air sucked from the ventilation port 65 is rotated by the rotation of the air cooling fan 64.
The inside of the mission case 8 is cooled by exhausting air to the outside.

In FIG. 9, a point different from the above example is that the rib 69 is formed on the inner peripheral surface of the belt case 16 so that the pulley 1
The cooling effect of the mission case 8 is enhanced by applying wind generated by the rotation of the air-cooling fan 64 that is integrated with 1 and 12. On the side surface of the belt case 64, a ventilation port 65 is provided around the bearing portion.
Are installed. In FIGS. 10 and 11, the hydraulic cylinder 6 for moving up and down the mowing frame 50 of the mowing device 49.
0 hydraulic circuit 61 is sucked from the bottom of the mission case 8 by a hydraulic pump P through a filter 71, and this hydraulic pressure is passed through a lift control valve 70 in the form of a spool valve attached to the control case 47 side of the mission case 8 The waste oil of the hydraulic cylinder 60 can be supplied to the cylinder 60, and the waste oil of the hydraulic cylinder 60 is returned so as to be directly poured into the planetary gear transmission system A in the mission case 8. Try to lose.

Further, the lift control valve 70 is
Since the transmission case 8 is attached to the control base 47 side, the interlocking mechanism of the link mechanism 71 is simple by rotating the power steering lever 48 in the front-rear direction. 12 and 13 show that a lock device for stopping the shortened position of the piston 70 with respect to the hydraulic cylinder 60 is provided at the connecting portion of the hydraulic cylinder 60 to the mowing frame 50. The piston 72 of the hydraulic cylinder 60 is connected by a lateral lift pin 74 to a box-shaped bracket 73 that is integral with the mowing frame 50. The lock device includes a bolt 75 that is adjustable with respect to the hydraulic cylinder 60, and a lock cam 78 that is rotatable with respect to the bracket 73 around a cam shaft 76 by a lever 77.
By rotating the lock cam 78 by the operation by and switching between a position approaching the lock bolt 75 and a position separating it from the lock bolt 75, the lock cam 78 and the lock bolt 75 are switched so as not to contact each other. When the lock cam 78 contacts the lock bolt 75, even if the hydraulic pressure of the hydraulic cylinder 60 is released and the piston 72 is shortened, the mowing frame 50 cannot be lowered further. The lower limit position of the reaping device 49 can be locked.

As shown in the figure, the lift pin 74 and the cam shaft 7
6 and 6 are provided on the bracket 73 so as to be parallel to the vertical position, so that the lock cam 7 for the hydraulic cylinder 60 is provided.
8 and the lock bolt 75 etc. are eliminated in the lateral expansion,
The space between the crawler 44 on the lateral side can be maintained as wide as possible.

[Brief description of drawings]

FIG. 1 is a front view of a mission case.

FIG. 2 is a side view thereof.

FIG. 3 is a front view of a belt continuously variable transmission mechanism section.

FIG. 4 is a side view of the combine.

FIG. 5 is a plan view thereof.

FIG. 6 is a front view of a part thereof.

FIG. 7 is a front view showing another embodiment.

FIG. 8 is a front view showing another embodiment.

FIG. 9 is a front view showing another embodiment.

FIG. 10 is a side view of a lift control valve section.

FIG. 11 is a front view thereof.

FIG. 12 is a side view of a hydraulic cylinder section.

FIG. 13 is a front view thereof.

[Explanation of symbols]

 1 Input Shaft 1B Pulley Shaft Part 4B Pulley Shaft Part 7 Output Travel Shaft 8 Mission Case 32 Gear Shift Lever 64 Air Cooling Fan A Planetary Gear Transmission System B Continuously Variable Belt Transmission System F Forward N Neutral R Reverse

Claims (1)

[Claims] 1. A transmission gear 7 is transmitted from an input shaft 1 by a planetary gear transmission system A and a continuously variable transmission belt transmission system B, and the output traveling shaft 7 is neutralized by continuously variable transmission of the continuously variable transmission belt transmission system B by a speed change lever 32. In a traveling transmission that continuously changes speed from N to forward rotation F and reverse rotation R, an air-cooling fan 64 is provided on the pulley shaft portions 1B and 4B of the mission case 8 in which the planetary gear transmission system A and the continuously variable transmission belt transmission system B are installed. Cooling device.