JP2583906Y2 - Traveling gear for work vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a traveling transmission for a working vehicle such as a combine, rice transplanter, or tractor having a hydraulic continuously variable transmission (HST) as a main transmission and a gear transmission as an auxiliary transmission. Related to the device.

[0002]

2. Description of the Related Art In recent years, there has been known a work vehicle in which a hydraulic continuously variable transmission (HST) is mounted as a traveling transmission and a forward traveling, a reverse traveling, a traveling stop, and an acceleration / deceleration are performed by a single traveling transmission lever. ing. Further, a gear type transmission is arranged at the subsequent stage of the hydraulic type continuously variable transmission to enable sub-transmission and to enable a wide selection of traveling speed.
It is known from Japanese Patent Application Laid-Open No. 4-183436. Also,
A brake pedal is provided in the control section separately from the traveling shift lever that operates the hydraulic continuously variable transmission, and the brake is operated by depressing the brake pedal in an emergency or the like, and the hydraulic continuously variable transmission is turned off. None at position N,
An apparatus for stopping an airframe is known from Japanese Utility Model Laid-Open Publication No. 58-97070.

[0003]

Among the above-mentioned traveling transmissions, the former one, in particular, has a gear type auxiliary transmission, so that the traveling speed can be set widely.
Since no emergency power shut-off device is provided, the combine cannot be stopped immediately in response to an unexpected situation. Also, when gear shifting operation of the gear type auxiliary transmission is performed in accordance with traveling on the road or work traveling, if the motor of the hydraulic continuously variable transmission is rotating at high speed, gear noise occurs during gear shifting and gears mesh smoothly. Absent. In order to prevent this, the hydraulic continuously variable transmission is returned to the neutral position by operating the traveling speed change lever, and the vehicle is stopped to perform the gear shifting operation. Due to the neutral braking effect and the load on the traveling axle on the lower side of the transmission, the rotation of each transmission gear on the transmission shaft is locked to each other, and when the peaks of the transmission gears are meshed, the gears do not mesh and forcibly mesh. Even if they are combined, there is a problem that the gears are in a half-meshed state and the shift is lost.

Further, in the latter case, when the brake pedal is depressed in an emergency, the machine body can be stopped, but there is a problem that it is not provided with a gear-type auxiliary transmission and the traveling speed cannot be set widely. Moreover, even if the gear type auxiliary transmission is provided on the lower side of the transmission of the hydraulic type continuously variable transmission, if the brake pedal is depressed and the gear transmission is operated,
Since the hydraulic continuously variable transmission is at the transmission cutoff position N and exerts a neutral braking action on the gear type auxiliary transmission, there is a problem that the gear shifting becomes difficult as in the former case.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a more improved traveling transmission device. The gear is operated by the travel shifting lever.
Transmission by hydraulic continuously variable transmission and auxiliary transmission lever
In a work vehicle transmitted to a traveling axle via an operated gear type transmission, an output shaft of an engine is connected to a pump of a hydraulic continuously variable transmission, and a motor and a transmission of the hydraulic continuously variable transmission are connected. a gear type transmission device provided on the case and connected via a dog clutch provided between them, further the clutch pedal provided in the steering unit, the depression of the clutch pedal, first neutral the hydraulic stepless transmission Or return to the low-speed position and then disconnect the dog clutch to release the motor of the hydraulic continuously variable transmission.
And the gear transmission is disconnected from the transmission.
It is characterized in that the.

[0006]

According to the present invention, the power of the engine is transmitted to the traveling axle through the hydraulic continuously variable transmission, the dog clutch, and the gear type transmission, and the vehicle travels.
While operating the hydraulic continuously variable transmission with the shift lever,
To run the al work vehicle. Also, when shifting the gear type transmission , the dog clutch is depressed by depressing the clutch pedal, and the transmission is shifted by the auxiliary transmission lever in a state where the transmission between the hydraulic continuously variable transmission and the gear type transmission is cut off. Perform the operation. Further, when the clutch pedal is depressed in an emergency or the like, the hydraulic continuously variable transmission is first returned to the neutral or low-speed position, the load on the dog clutch pawl is reduced, and then the clutch pedal is further depressed. ,
Disconnect the dog clutch and stop the work vehicle immediately.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is applied to a combine will be described with reference to the drawings. As shown in FIGS. 2 and 3, the combine 1 is equipped with a threshing device 5 having a handle drum 4 and the like on the left side of a body frame 3 having left and right crawler traveling devices 2 and 2, and a right front portion of the threshing device 5. Is provided with an engine 6, and a radiator 7 is provided behind the engine 6.
A frame 8 in front of the threshing device 5 is fixed to the body frame 3, and the frame 8 is a hydraulically operated pre-processing unit 9 including a weeding / raising device, a cutting blade, a scraping transport device, a deep transport device, and the like. It is supported by a cylinder 10 so that it can move up and down. Also,
On the right side of the pre-processing unit 9, a cabin 12 integrally provided with a control unit including a control seat 11 and the like is provided.

As shown in FIGS. 2 to 4, a counter case 13 is fixed to the body frame 3 at a lower front portion of the threshing device 5. An input shaft 14 supported by the counter case 13 is connected to an output shaft 6a of the engine 6 via a transmission shaft 16 having free joints 15 on both sides. Further, the counter case 13 detachably fixes the pump 17 of the hydraulic type continuously variable transmission and the working hydraulic pump 18, and the power transmitted to the input shaft 14 is transmitted from a gear 19 fixed to the input shaft 14. The speed is increased and transmitted to a gear 21 fixed to the outer diameter of the hollow shaft 20, and
The pump input shaft 17a of the hydraulic stepless transmission and the input shaft 18a of the working hydraulic pump 18 are fitted to splines provided on the inner diameter of the spline portion to drive them. The other gear 22 fixed on the hollow shaft 20 is
The transmission shaft 23 extends toward the engine 6, and a threshing drive pulley 25 is fixed to the end of the transmission shaft 23. The transmission shaft 23 is covered by a holding cylinder 26, and one end of the holding cylinder 26 is fixed to the counter case 13, and the other end is fixed to the body frame 3. Further, the threshing drive pulley 25 drives a pulley 27 located above with a belt 28. Pulley 2
7 drives a bevel gear (not shown) provided in a gear box 4b of the threshing device 5, and finally the handle shaft 4a.
Is driven to rotate.

Further, a hydraulic oil tank 30 is provided in front of the threshing apparatus 5 and on the body frame 3 substantially at the center of the body. The hydraulic oil in this tank is guided to a filter 32 by a low-pressure hose 31 (the filter 32 is integrally fixed to the pump 17 of the hydraulic continuously variable transmission) and supplied to a charge pump of the hydraulic continuously variable transmission. I do. Although a detailed description of the hydraulic continuously variable transmission itself is omitted, the control arm 33 for changing the angle of the swash plate of the pump 17 by a hydraulic servo mechanism is linked to a traveling speed change lever 65 described later. From the neutral position N to the forward side F or the reverse side R
By changing the direction, the direction of the pressure oil discharged from the high pressure hoses 34 and 35 connected to the pump 17 and the discharge amount are changed. A transmission case 36 supported by the body frame 3 is provided at a lower front portion substantially at the center of the body, and a hydraulic stepless transmission connecting the other ends of the high-pressure hoses 34 and 35 is provided on the upper left side of the transmission case 36. The motor 37 of the device is fixed. Motor 37
Receives the pressure oil from the pump 17 and stops or rotates forward or backward. Further, the hydraulic oil that has lubricated and cooled the pump 17 and the motor 37 by the charge pump is returned to the hydraulic oil tank 30 via an oil cooler (not shown) by a hose 38.

Next, the structure of the transmission will be described. As shown in FIGS. 5 to 7, the transmission case 36 is provided with a motor 37 of a hydraulic continuously variable transmission.
Is fixed. A motor output shaft 37 a of the hydraulic continuously variable transmission is connected to an input shaft 40 via a coupling 39 in the transmission case 36. A dog gear 43 which is slidably urged toward the input gear 42 by a spring 41 at all times is spline-fitted to the input shaft 40. Here, the dog gear 43 meshes with the internal teeth 42 a provided on one of the input gears 42, but the meshing can be broken by moving the dog gear 43 with a shifter against the spring 41. Power transmission to the device is shut off.

In the following, a description will be given of a gear transmission that constitutes a sub-transmission. The input gear 42 meshes with a large-diameter tooth 45a of a gear 45 loosely fitted on an intermediate shaft 44, and a small-diameter tooth 45b of the gear 45 engages with a transmission shaft 46. The transmission gear 46 is driven by meshing with the fixed gear 47. The transmission shaft 46 is provided with the transmission gear 4.
8, a low-speed gear 49 and a medium-speed gear 50 are loosely fitted on the left and right sides thereof. Accordingly, the shift gear 48 is moved by a shifter associated with an auxiliary shift lever provided on a control unit (not shown), so that the internal teeth 4 are moved.
When the low speed gear 49 meshes with the low speed gear 8a, the intermediate shaft 44 is driven at low speed via the gear 51. Similarly, the intermediate shaft 44 can be driven at a medium speed via the gear 52 by moving the speed change gear 48 and engaging the other internal tooth 48 b with the medium speed gear 50. Then, when driving the intermediate shaft 44 at high speed,
The gear can be shifted by engaging the high-speed teeth 48c of the transmission gear 48 with the gear 53 fixed to the intermediate shaft 44.

The power appropriately shifted by the gear transmission described above is transmitted to the lower shaft 5 by the gear 53 of the intermediate shaft 44.
4 through a gear 55, and further transmitted to a center gear and a side clutch gear provided on a steering shaft and left and right traveling axles 56 and 57 in the same manner as in the conventional device, and to sprockets 58 and 59 provided on the axle. The crawler traveling devices 2, 2 are driven. At the left end of the transmission shaft 46, there is provided a pre-processing transmission pulley 61 incorporating a one-way clutch 60, and only the forward driving force of the hydraulic continuously variable transmission is transmitted from the pulley 61 to the belt 62 and the tension clutch. It is transmitted to the input pulley 64 of the pre-processing unit 9 via the pulley 63.

The control arm 3 of the hydraulic continuously variable transmission is particularly preferred among the constructions of the control section installed in the cabin 12.
The configuration of the traveling speed change lever 65 linked to No. 3 and the clutch pedal 66 linked to the dog gear 43 of the dog clutch will be described below. As shown in FIG. 1, a clutch pedal 66 and a traveling speed change lever 65 are provided in the control unit. The clutch pedal 66 is supported by a fulcrum shaft 67 provided below the step 12a of the cockpit 11. A clutch wire 69 is connected to an arm 68 integrally connected to the base of the clutch pedal 66 via a pin 68a. Fixed. The other end of the clutch wire 69 is linked to the shift arm 70 of the dog gear 43 provided on the transmission case 36. The shift arm 70 is rotated about the fulcrum shaft 71 by the operation of the clutch wire 69 to disconnect the dog clutch. Further, a rod 72 is connected to the shift arm 70, and the rod 72 has an appropriate play range so that the transmission case 36
A brake device 73 provided on a steering shaft (not shown) is operated to brake the body. On the other hand, the shaft 68 provided on the arm 68
b pivotally supports the roller 74 so that it can rotate freely.
Abuts against an end face of a cam plate 76 pivotally supported by a shaft 75,
The cam plate 76 is rotated. Also, the cam plate 7
One end of an inner wire 77a is fixed to the upper end of 6, and the outer wire 77b is fixed to the control section. The other end of the inner wire 77a has a long hole 7 which is engaged with a pin 65a protruding in the middle of the traveling speed change lever 65.
9a is connected to a neutral return plate 79. Similarly, the lower end of the cam plate 76 has an inner wire 7
8a while fixing one end of the outer wire 78b.
Is fixed to the control unit. And the inner wire 7
The other end of 8a is a neutral return plate 80 having a long hole 80a.
It is fixed to. Reference numeral 81 denotes a return spring of the clutch pedal 66 provided on the arm 68.

Next, as described above, the traveling speed change lever 65 is provided with the long holes 79a, 8
It has a pin 65a that engages with the shaft 0a, and is configured to be tiltable back and forth about a fulcrum shaft 82 provided at the lower part. still,
A brake device 83 is provided at the base of the lever 65 and holds the lever 65 at the operated position. Also, lever 6
5 is connected to a rod 84 that is linked to the control arm 33 of the hydraulic continuously variable transmission.
5 is tilted in the forward F or reverse R direction from the neutral position N, whereby the arm 33 of the hydraulic stepless transmission is rotated via the rod 84, and the direction and amount of pressure oil discharged from the pump 17 are changed. The motor 37 is driven by changing the speed. The pins 65a provided on the traveling speed change lever 65 are normally provided with the long holes 79a, 80a of the neutral return plates 79, 80.
The traveling speed change lever 65 can freely perform a speed change operation in opposition to the brake device 83 only by moving inside the vehicle. However, when the clutch pedal 66 is depressed, the arm 68 rotates and the cam plate 76 Is rotated. When the cam plate 76 rotates, the inner wires 77a, 78a
Is pulled, the neutral return plates 79, 80 move to the left and right, and the pins 65a that engage with the ends of the long holes 79a, 80a.
, The traveling speed change lever 65 is returned to the neutral position N or, if necessary, to the low speed position. (The neutral return plate 7 is adjusted by adjusting the outer receptacles of the wires 77 and 78.
The return position of the long holes 79a, 80a of the 9, 80 can be adjusted, and the return of the lever 65 can be selected to the neutral position or the low-speed position. Here, when the clutch pedal 66 is almost depressed from the A position to the B position in the initial depression operation (from the O position to the A position) during the operation stroke, the traveling speed change lever 65 is almost returned to the low speed position. The traveling speed change lever 65 is completely returned to the neutral or low speed position. At the same time, the clutch pedal 66 shifts the dod gear 43 as described above and releases the dog clutch. Further, when the driver depresses beyond the position C, the traveling brake device 73 of the transmission case 36 is operated to immediately stop the aircraft.

In the above configuration, in order to perform the harvesting operation with the combine 1, the engine 6 is started, and the pre-processing unit 9 and the threshing device 5 are driven with the cutting clutch lever and the threshing clutch lever (not shown) being engaged. Next, the operator tilts the traveling shift lever 65 to the forward F side to start traveling. Then, at the time of turning or the like, the traveling speed lever 65 is moved to the reverse R side, and the traveling speed is appropriately increased or decreased by the traveling speed lever 65 to perform work at an appropriate traveling speed. In this case, the power of the engine 6 is transmitted to the counter case 13 and the pump input shaft 17 a of the hydraulic continuously variable transmission via the transmission shaft 16, and the pump 17 is transmitted to the transmission case 36 at the speed set by the traveling speed change lever 65. The provided motor 37 is driven. Since the dog clutch in the transmission case 36 is connected, the transmission is transmitted to the lower transmission gear transmission. In the gear transmission, the transmission gear 48 is previously shifted to a low or medium speed position by an auxiliary transmission lever provided in a control unit (not shown), so that the power transmitted through the gear transmission is transmitted to the axles 56 and 57 and the crawler travels. The devices 2 and 2 rotate and the combine 1 runs.

Next, during operation, when it is desired to change the traveling speed range by the traveling speed change lever 65 or to shift to traveling on the road, the clutch pedal 66 is depressed, and the speed change gear 48 is moved to low speed, medium speed, Or shift to the high-speed position. In this case, when the clutch pedal 66 is depressed from the O position to the A position, first, the traveling speed change lever 65 is returned to the low speed. When the driver further depresses from the position A to the position B, the traveling speed change lever 65 is completely returned to the neutral or low speed, and the motor 37 of the hydraulic continuously variable transmission stops rotating or operates at a low speed. Such a load is reduced. In this state, the dog gear 43 is turned off, and the coupling transmission between the hydraulic continuously variable transmission and the gear transmission is performed.
The state is cut off. Thus, rotational power to a neutral braking effect of the hydraulic stepless transmission which is provided to the transmission upstream side in the gear type transmission is not if及, slow the speed change gear 48 in the auxiliary shift lever,
When shifting to the medium speed or high speed position, the transmission gear 48 of the gear transmission is free to rotate, and can smoothly mesh with the low speed, medium speed or high speed gear without half-meshing or the like.

Further, even if the depressing operation of the clutch pedal 66 is released after the sub-shift operation, the dog gear 43 is returned because the traveling shift lever 65 is returned to the neutral or low-speed position.
Can smoothly engage with the input gear 42 without generating gear noise, etc., and the aircraft keeps a stopped state or starts at a low speed irrespective of the engagement of the dog clutch. Is safe.
Similarly, by depressing the clutch pedal 66, the dog clutch can be disengaged and the aircraft can be stopped, so if the aircraft is to be stopped urgently due to an unexpected situation, the traveling speed change lever 65 must be manually neutralized. By returning, it is possible to stop the machine immediately by depressing the clutch pedal 66 with a small operating force without waiting for the rotation of the motor 37 of the hydraulic continuously variable transmission to stop. Moreover,
Emergency braking is possible by applying the travel brake 73 by depressing the clutch pedal 66 beyond the C position.

[0018]

As described above, according to the present invention, the power of the engine 6 is transferred to the hydraulic continuously variable transmission, the dog clutch ( dog gear ).
43, the internal teeth 42a) and the transmission to the traveling axles 56 and 57 via the gear type transmission, so that the hydraulic continuously variable main speed change operation by the traveling speed change lever 65 and the gear type auxiliary speed change operation by the auxiliary speed change lever are performed. It is possible to run in a wide speed range. Further, when the shift operation of the gear-type transmission apparatus, the hydraulic stepless transmission a dog clutch as the cross-sectional
Since the speed change operation can be performed by the auxiliary speed change lever in a state where the connection transmission state is cut off, the transmission upper gear 48 of the gear type transmission is used for the rotational power of the hydraulic continuously variable transmission or the neutral braking action. Without being affected, the rotation is free, and the gear shifting operation can be performed extremely smoothly without causing half-meshing. Further, when the clutch pedal 66 is depressed in an emergency or the like, the hydraulic continuously variable transmission can be returned to the neutral or low speed position first, so that the drive load of the hydraulic continuously variable transmission to the dog clutch is reduced. it is a cross dog clutch, therefore, the work vehicle can be emergency stop lightly the operation force, quickly cope with contingencies. Only
Also depress the clutch pedal 66 after the sub-shift operation.
Even if it is released, the traveling speed change lever 65 is in the neutral or low speed position.
, The dog gear 43 stops rotating or runs low.
Gear noise etc. may occur due to high speed rotation
To smoothly return the dog clutch to the engaged state
Can be.

[Brief description of the drawings]

FIG. 1 is a side view showing a traveling speed change lever and a clutch pedal.

FIG. 2 is a left side view showing a part of the combine.

FIG. 3 is a front view showing a main part of the traveling transmission.

FIG. 4 is a plan sectional view showing a motor part of a counter case and a hydraulic type continuously variable transmission.

FIG. 5 is an XZ showing a part of the transmission case.
It is sectional drawing.

FIG. 6 is a YZ view showing a part of the transmission case;
It is sectional drawing.

FIG. 7 is a left side view of the transmission case.

[Explanation of symbols]

 6 Engine 17 Pump for hydraulic continuously variable transmission 36 Transmission case 37 Motor for hydraulic continuously variable transmission 43 Dog gear 65 Travel gear lever 66 Clutch pedal

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-46350 (JP, A) JP-A-61-139822 (JP, U) JP-A-58-29520 (JP, U) JP-A-56-295 124564 (JP, U) Japanese Utility Model Showa 48-82406 (JP, U) Japanese Utility Model Showa 62-81758 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16H 47/02-47 / 04 F16H 59/00-63/48 B60K 17/00-17/08 B60K 20/00-20/08

Claims (1)

(57) [Scope of request for utility model registration] 1. The power of an engine is controlled by a travel shift lever.
Hydraulic continuously variable transmission operated by speed change operation and auxiliary speed change lever
In a work vehicle that is transmitted to a traveling axle via a gear type transmission that is shifted by a gear, the output shaft of the engine is connected to the pump of the hydraulic continuously variable transmission, and the motor of the hydraulic continuously variable transmission is connected. and a gear type transmission device provided in the transmission case are connected via a dog clutch provided between them, a clutch pedal is provided and more maneuverable part, by depression of the clutch pedal, first HST To the neutral or low-speed position, and then disconnect the dog clutch to release the hydraulic continuously variable transmission.
Let's cut off the connection transmission state between the motor and the gear type transmission
A traveling transmission for a work vehicle, wherein the traveling transmission is configured as described above .