JPH0956245A - Transmission in working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a hydraulic stepless speed change gear by streamlining the disposition of a revolution transmission channel to the hydraulic stepless speed change gear and facilitating maintenance. SOLUTION: In a working vehicle equipped with a traveling device 3 having a pair of left and right crawlers 2 situated under a machine body frame 1, a control section 10 having a step 11 for a relevant operator to stand on, mounted on one side above the front side of the machine frame 1, an engine 15 situated behind the control section 10 and mounted so as to locate a radiator fan 16 outside, and a hydraulic stepless speed change gear 22 to transmit the revolution of the engine 15 under stepless speed change to the traveling device 3, the hydraulic stepless speed change gear 22 is disposed between the crawlers 2 and the step 11 and designed to transmit the revolution of an output shaft 25 provided on the radiator fan 16 side of the engine to an input shaft 23 formed on the radiator fan 16 side of the speed change gear 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a work vehicle.

[0002]

2. Description of the Related Art Conventionally, a traveling device having a pair of left and right crawlers located below a machine body frame, a control section provided on one upper side of the front side of the machine body and having a step for an operator to stand, and a rear side of the control section. A hydraulic vehicle continuously variable transmission for transmitting a rotation of the engine to the traveling device in a stepless manner by transmitting the rotation of the engine to the traveling device. Is known between the left and right crawlers, and the rotation of the output shaft provided on the side opposite to the radiator fan of the engine is transmitted to the input shaft of the hydraulic continuously variable transmission.

[0003]

In the above-mentioned known example, the hydraulic continuously variable transmission is arranged between the left and right crawlers, and the rotation of the output shaft provided on the side of the engine opposite to the radiator fan (center side of the machine body) is not hydraulically operated. Since the structure is such that the transmission is transmitted to the input shaft of the gear transmission, the rotation transmission mechanism from the engine is complicated, and the maintenance is very troublesome due to the poor arrangement. Since the side part of the device is surrounded by crawlers, and in the case of the combine, there is a mowing part on the front side, the hydraulic continuously variable transmission is surrounded, the cooling air is blocked, the temperature rises, and the durability is adversely affected. In addition, there is a problem that the presence of the hydraulic continuously variable transmission and the transmission mechanism narrows the grain culm conveying passage of the mowing section, thereby reducing the mowing performance.

[0004]

An object of the present invention is to rationalize the arrangement of a rotation transmission path to a hydraulic continuously variable transmission, facilitate maintenance, and improve the durability of the hydraulic continuously variable transmission.

[0005]

According to the present invention, a traveling device 3 having a pair of left and right crawlers 2 positioned below a machine body frame 1 and a worker provided on one upper side of the front side of the machine body frame 1 stand. A control unit 10 having a step 11, an engine 15 mounted behind the control unit 10 so that a radiator fan 16 is located outside, and the engine 1
In a working vehicle having a hydraulic continuously variable transmission 22 for continuously transmitting the rotation of the gear 5 to the traveling device 3, the hydraulic continuously variable transmission 22 is arranged between the crawler 2 and the step 11. Of the work vehicle configured to transmit the rotation of the output shaft 25 provided on the radiator fan 16 side of the engine 15 to the input shaft 23 provided on the radiator fan 16 side of the hydraulic continuously variable transmission 22. It is a transmission device.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
Is a machine body frame of the working machine, which will be described with an example of a combine. A traveling device 3 including a pair of left and right crawlers 2 is provided below the machine body frame 1. The traveling device 3 is configured by winding the crawler 2 around the rolling wheels 4, idler wheels (not shown), and drive wheels 5. The left and right drive wheels 5 are attached to a wheel shaft 6, and the wheel shaft 6 is attached to a mission case 7. A control unit 10 is provided on one side above the front side of the machine body frame 1. The control unit 10 is a step 11 where the worker stands.
And a driver's seat 12 and a driver's seat 1 on which an operator sits
The control panel 13 is provided with switches and levers in the vicinity of the periphery 2 and a cabin 14 that surrounds these. The driver's seat 12 is located above the engine 15, and the radiator fan 1 is provided on the outer side of the engine 15.
6 is provided, and the radiator 17 is provided on the outer side portion of the radiator fan 16. Therefore, the driver's seat 12 is provided on the engine cover 18 provided above the engine 15.
The engine cover 18 is detachably fixed to the body frame 1 side, and the engine 15 is maintained by removing the driver's seat 12 and the engine cover 18, but a window for maintenance is provided in a portion where the driver's seat 12 is removed from the engine cover 18. May be opened. Reference numeral 19 is a net provided outside the radiator 17, 20 is a rotating shaft of the radiator fan 16, 21 is a pulley, 21a is a belt, and 21b is an alternator pulley.

Therefore, the mission case 7 is located below the step 11 in a side view, and a hydraulic continuously variable transmission (HST) 22 is provided on the side surface of the mission case 7 on the side where the radiator 17 of the engine 15 is provided. To provide. That is, the hydraulic continuously variable transmission 22 is provided above the traveling device 3 and between the step 11 and the engine 15
It is placed on the radiator 17 side of. And radiator 1
The input pulley 23 is provided on the input shaft 23 of the hydraulic continuously variable transmission 22 provided on the 7 side, and the radiator 17 of the engine 15 is provided.
The belt 27 between the pulley 26 provided on the output shaft 25 on the side
Around. 28 is a tension clutch pulley, 29 is an HST (main speed change) lever for operating the hydraulic continuously variable transmission 22, and 30 is a link mechanism thereof. Reference numeral 31 is a wind direction guide plate provided on the front side of the radiator fan 16, and guides the wind of the radiator fan 16 so as to blow toward the hydraulic continuously variable transmission 22. Input shaft 2 provided with the input pulley 24
3 is provided with an output pulley 34, and the output pulley 34 is provided with a belt 37 between an intermediate pulley 36 provided in a gear box 35.
The gear box 35 is connected to a discharge device 39 of a Glen tank 38 provided on the rear side of the engine cover 18. 40 is a tension clutch pulley. Another output pulley 41 is provided on the side opposite to the radiator 17 of the engine 15, and a belt 44 is wound around the output pulley 41 between an intermediate pulley 43 that transmits rotation to the threshing device 42.

An output pulley 45 to the mowing section is provided on the anti-hydraulic continuously variable transmission 22 side of the transmission case 7, and a belt 48 is provided between the output case 45 and a mowing input pulley 47 provided on a support frame 46 of the mowing section. Hang around. 49 is a blast bun,
Reference numeral 50 is a grass body of the cutting unit. In the embodiment of FIGS. 4 to 7, another output pulley 52 is provided on the input shaft 23 of the hydraulic continuously variable transmission 22. An air conditioner compressor 53 for the cabin 14 is provided on the front side of the hydraulic continuously variable transmission 22,
A belt 55 is wound around the input pulley 54 and the output pulley 52 of the air conditioner compressor 53. Reference numeral 51 is a tension pulley. FIGS. 8 to 9 show another embodiment, in which an output pulley 56 for outputting rotation is provided to the threshing device and threshing device 42 separately from the pulley 26 on the output shaft 25 on the radiator 17 side of the engine 15. 57 is a belt, 58 is a tension pulley, 59 is a pulley, 60 is an intermediate shaft, 61, 62
Is a pulley, 63 is a belt, and 64 is a tension clutch pulley. 10 to 13 show another embodiment, in which the base of the arm 71 is fixedly attached to the trunnion shaft 70 of the hydraulic continuously variable transmission 22, and the elastic member 72 such as a rubber bush is attached to the tip of the arm 71. The pin 73 is inserted, and the operation rod 74 forming a part of the link mechanism 30 is attached to the pin 73. 75 is neutral rock metal.

[0009]

Next, the operation will be described. When the engine 15 is started, the rotation of the engine 15 is output from the output shaft 25 and transmitted to the input shaft 23 of the hydraulic continuously variable transmission 22 via the belt 27, and the hydraulic continuously variable transmission 22 stops the rotation of the engine 15. The gear is shifted in stages and transmitted to the mission case 7, and the traveling device 3 is driven to drive the machine body. In this case, since the conventional hydraulic continuously variable transmission 22 is provided in the middle of the left and right crawlers 2, the rotation transmission mechanism from the engine 15 becomes complicated and maintenance is not easy. The continuously variable transmission 22 is located after the mowing section to narrow the grain culm transport passage, and the hydraulic continuously variable transmission 22
Since the surroundings are surrounded, the temperature may rise. However, according to the present invention, the hydraulic continuously variable transmission 22 is located between the upper side of the side view traveling device 3 and step 11 and on the radiator 17 side of the engine 15. Of the hydraulic continuously variable transmission 2 disposed on the radiator 17 side and located substantially below step 11.
Since the belt 27 is wound around the input pulley 24 of the second input shaft 23 and the pulley 26 of the output shaft 25 on the radiator 17 side of the engine 15, the rotation transmission mechanism from the engine 15 is not connected via an intermediate shaft or the like. It can be configured with one belt 27 without having to do so, which is very simple and easy to maintain.
If step 11 is configured to be openable / closable or detachable, and opened, the maintenance of the hydraulic continuously variable transmission 22 and the transmission mechanism is facilitated also from this point, and in the case of the combine, the hydraulic continuously variable transmission 22 is mowed. Since it is located away from the rear part to the side part, the grain culm transport passage is widened to improve the mowing performance, and the hydraulic continuously variable transmission 22 is provided below step 11 where the surroundings are opened. It is naturally cooled by cooling air from the front to prevent temperature rise. Further, the cooling air from the radiator fan 16 can be received to prevent the temperature from rising. Especially, radiator fan 1
Since the wind direction guide plate 31 for guiding the wind of 6 to the hydraulic continuously variable transmission 22 is provided, the effect is further enhanced.

In the embodiment shown in FIGS. 4 to 7, the hydraulic continuously variable transmission 22 is arranged between the upper side of the side view traveling device 3 and step 11 and on the radiator 17 side of the engine 15, and the step of step 11. The input pulley 2 of the input shaft 23 of the hydraulic continuously variable transmission 22 which is located below and is provided on the radiator 17 side.
4 and the pulley 26 of the output shaft 25 on the radiator 17 side of the engine 15 around the belt 27, and another output pulley 52 is provided on the input shaft 23 of the hydraulic continuously variable transmission 22. A belt 55 is provided between the speed change device 22 and the input pulley 54 of the air conditioner compressor 53 on the front side.
Since the hydraulic continuously variable transmission 22 and the transmission mechanism are easily maintained, and because the hydraulic continuously variable transmission 22 and the air conditioner compressor 53 are provided below the step 11 where the surroundings are opened, It is naturally cooled by cooling air from the front, improving durability.
Further, since the air conditioner compressor 53 is attached to the body frame 1 side below the step 11, the attachment strength can be maintained without being affected by the vibration from the engine 15 and the hydraulic continuously variable transmission 22, and the air conditioner compressor 53 can be maintained.
It also improves the durability of itself.

In the embodiment shown in FIGS. 8 to 9, the output shaft 25 on the radiator 17 side of the engine 15 is provided with the output pulley 56 for outputting the rotation to the threshing device 42 separately from the pulley 26. The maintenance of the transmission mechanism of the engine is facilitated, and the belt 57 is provided between the radiator fan 16 and the engine 15.
Improves durability without being exposed to heat. Also,
Since the belt 57 wound around the output pulley 56 faces in the opposite direction to the belt 27 wound around the hydraulic continuously variable transmission 22, the moment applied to the output shaft 25 is offset and the twisting of the engine 15 is prevented. In the embodiment shown in FIGS. 10 to 13, the base of the arm 71 is fixedly attached to the trunnion shaft 70 of the hydraulic continuously variable transmission 22, and the tip of the arm 71 is pinned via an elastic member 72 such as a rubber bush. Since the operation rod 74 and the neutral lock metal 75, which form a part of the link mechanism 30, are attached to the pin 73, the vibration of the hydraulic continuously variable transmission 22 is blocked by the elastic member 72, and the link mechanism is inserted. Since it can be prevented from being transmitted to 30, the noise around the hydraulic continuously variable transmission 22 is prevented. That is, noise of unexplained cause such as “bee” was generated around the hydraulic continuously variable transmission 22, but these are due to the vibration generated from the trunnion shaft 70 of the hydraulic continuously variable transmission 22. It was found that this noise was prevented.

[0012]

According to the present invention, a traveling unit 3 having a pair of left and right crawlers 2 located below a machine body frame 1 and a control section having a step 11 for standing a worker provided on one upper side of the front side of the machine body frame 1. 10, an engine 15 mounted behind the control unit 10 so that the radiator fan 16 is located outside, and a hydraulic stepless transmission for continuously transmitting the rotation of the engine 15 to the traveling device 3. Device 22
And a hydraulic vehicle continuously variable transmission 22.
Is arranged between the crawler 2 and the step 11,
A power transmission device for a work vehicle configured to transmit the rotation of an output shaft 25 provided on the radiator fan 16 side of the engine 15 to an input shaft 23 provided on the radiator fan 16 side of the hydraulic continuously variable transmission 22. Therefore, the rotation transmission mechanism from the engine 15 can be constituted by one belt 27 without an intermediate shaft or the like, which is very simple and easy to maintain, and the step 11 can be opened and closed or detached. If freely configured and opened, maintenance of the hydraulic continuously variable transmission 22 and the transmission mechanism will be easy. Further, since the hydraulic continuously variable transmission 22 is provided below the step 11 where the periphery is open, The cooling air is naturally cooled by the cooling air from the radiator fan 16, and the cooling air from the radiator fan 16 can be received to prevent the temperature from rising and improve the durability. Further, in the example of the combine, since the hydraulic continuously variable transmission 22 is located away from the rear of the mowing section to the side, it is possible to widen the grain-culm conveying passage and improve the mowing performance. Play.

[Brief description of drawings]

FIG. 1 is a side view.

FIG. 2 is a plan view of a main part.

FIG. 3 is a front view of a main part.

FIG. 4 is a plan view of a main part of another embodiment.

FIG. 5 is a front view of the same section.

FIG. 6 is a partial plan view of the hydraulic continuously variable transmission.

FIG. 7 is a side view of the same.

FIG. 8 is a plan view of a main part of another embodiment.

FIG. 9 is a side view of the same.

FIG. 10 is a side view of the arm of the embodiment of the hydraulic continuously variable transmission.

FIG. 11 is a perspective view of the same.

FIG. 12 is a perspective view of the same.

FIG. 13 is a front view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body frame, 2 ... Crawler, 3 ... Traveling device, 4 ...
Rolling wheels, 5 ... Drive wheels, 6 ... Wheel shafts, 7 ... Mission case, 10 ... Control section, 11 ... Steps, 12 ... Driving seat,
13 ... Control panel section, 14 ... Cabin, 15 ... Engine, 16 ... Radiator fan, 17 ... Radiator, 18
... engine cover, 19 ... mesh, 20 ... rotating shaft of radiator fan 16, 21 ... pulley, 21a ... belt, 21b
... alternator pulley, 22 ... hydraulic continuously variable transmission, 2
3 ... Input shaft, 24 ... Input pulley, 25 ... Output shaft, 26 ...
Pulley, 27 ... Belt, 28 ... Tension clutch pulley, 29 ... HST (main shift) lever, 30 ... Link mechanism, 31 ... Wind direction guide plate, 34 ... Output pulley, 35 ... Gear box, 36 ... Intermediate pulley, 37 ... Belt , 38 ...
Glen tank, 39 ... Ejection device, 40 ... Tension clutch pulley, 41 ... Output pulley, 42 ... Threshing device, 44
... Belt, 45 ... Output pulley, 46 ... Support frame, 4
7 ... Mowing input pulley, 48 ... Belt, 52 ... Output pulley, 53 ... Air conditioner compressor, 54 ... Input pulley,
55 ... Belt, 56 ... Output pulley, 57 ... Belt, 58
... tension clutch pulley, 59 ... pulley, 60 ... intermediate shaft, 61, 62 ... pulley, 63 ... belt, 64 ... tension clutch pulley, 74 ... operating rod, 75 ... neutral lock metal.

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[Procedure amendment]

[Submission date] October 17, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

FIG. 4

[Figure 5]

FIG. 6

[Figure 10]

FIG. 11

FIG. 7

[Figure 8]

[Figure 9]

FIG.

FIG. 13

Claims (1)

[Claims] 1. A traveling device 3 having a pair of right and left crawlers 2 positioned below a machine body frame 1, and a step 1 for standing a worker provided on one upper side of a front side of the machine body frame 1.
1, the engine 15 mounted behind the control unit 10 so that the radiator fan 16 is located outside, and the rotation of the engine 15 is controlled by the traveling device 3
In a work vehicle having a hydraulic stepless transmission 22 for continuously transmitting and transmitting the hydraulic stepless transmission, the hydraulic stepless transmission 22 is disposed between the crawler 2 and the step 11. 22. A transmission device for a work vehicle configured to transmit the rotation of an output shaft 25 provided on the radiator fan 16 side of the engine 15 to an input shaft 23 provided on the radiator fan 16 side of the engine 22.