JP2001028906A - Sulky working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable smooth turning motion of a sulky working vehicle to perform the turning motion by making the running speed of the right and left running parts to be different from each other. SOLUTION: This sulky working vehicle is provided with an engine E, a traveling speed changer 20 connected to the engine E and enabling the change of speed in plural stages in normal and reverse directions, a turning speed changer 23 connected to the engine E parallel to the traveling speed changer 20 and enabling stepless change of speed in normal and reverse directions by the operation of a steering operation part, a divided outputting mechanism 24 connected in interlocked state to the turning speed changer 23 in series and outputting the output of the turning speed changer 23 in a state divided into complementary two outputs and a right and left power synthesizing mechanism to synthesize the output of the running speed changer 20 and the normal and reverse output of the divided outputting mechanism 24 and transmitting the result to the right and left running parts. The output of the engine E is branched and transmitted to the running speed changer and the turning speed changer and the output of the running speed changer and the normal and reverse output of the divided outputting mechanism are synthesized by the right and left power synthesizing mechanism and transmitted to the right and left running parts. The running speeds of the right and left running parts are made to be different from each other by the operation of the steering operation part to perform the turning motion. A normal and reverse output switching mechanism 22 to switch the output direction in normal and reverse directions interlocked with the normal and reverse switching of the output direction of the running speed changer 20 is placed between the engine E and the turning speed changer 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a passenger work vehicle.

[0002]

2. Description of the Related Art Conventionally, a riding operation has been performed in which a differential device is provided between left and right running portions and a running speed is made different by moving a traveling speed of the left and right running portions by applying a brake to one of the running portions. There is a car.

[0003]

However, the above-mentioned turning travel depends on the balance between the frictional action of the brake and the frictional action between the road surface and the left and right traveling parts. However, there is a problem that smooth turning cannot be performed.

In view of the above, an engine and a traveling transmission that is linked to the engine and is capable of performing a plurality of forward and reverse speed shifts are provided.
An engine is connected in parallel to the traveling transmission in parallel with the traveling transmission, and a turning transmission capable of steplessly shifting in the forward and reverse directions by operating a steering operation unit, and an interlocking connection in series to the turning transmission. A split output mechanism for dividing the output of the turning transmission into two complementary outputs, that is, two outputs having the same absolute value of the rotational speed and opposite rotational directions, and outputting the divided output; the output of the traveling transmission and the divided output; A right and left power combining mechanism that combines the forward and reverse outputs of the mechanism and transmits the combined power to the left and right traveling units is disposed, and the engine output is branched and transmitted to the traveling transmission and the turning transmission.
The right and left power combining mechanism combines the output of the traveling transmission and the forward / reverse output of the split output mechanism to transmit to the left / right traveling section, and changes the forward / reverse gear ratio of the traveling transmission to travel speed. By changing the forward / reverse speed ratio of the turning transmission and changing the running speed of the left and right running parts, the above-mentioned instability of the balance is eliminated, and the aircraft performs smooth turning traveling. There is a passenger work vehicle.

[0005] However, when the traveling direction is changed, a so-called reverse steering wheel decrease in which the operating direction of the steering operation section and the turning direction are reversed occurs, and there arises a problem that the traveling operation becomes difficult.

Therefore, a reverse handle preventing mechanism for reversing the output rotation direction of the turning transmission in conjunction with the forward / reverse speed change operation of the traveling transmission is provided so that the reverse steering phenomenon does not occur even if the traveling direction is changed. However, there is a problem that the structure of the reverse handle prevention mechanism is complicated, the manufacturing cost is high, and adjustment for normal operation is complicated.

[0007] Further, since the speed change action of the traveling transmission is stepped, there is a problem that traveling cannot be performed at an optimum speed for work.

Further, there is a problem that the turning transmission idles due to the reaction force of the running resistance and the straightness is deteriorated. In order to solve this problem, the transmission operates in conjunction with the straight running operation of the running operation unit. It is necessary to prevent the idling by interlocking the straight-ahead brake with the turning transmission, and there is a problem that the structure becomes complicated and the cost increases.

[0009]

SUMMARY OF THE INVENTION Accordingly, in the present invention, there is provided an engine, a traveling transmission which is interlocked with the engine and which can be shifted in forward and reverse directions by operating a traveling operation unit, and a traveling transmission. A turning transmission that is interlocked with the engine in parallel and can be steplessly shifted in the forward and reverse directions by operating the steering operation unit, and an output of the turning transmission that is interlocked and connected in series with the turning transmission. And a left and right power combining mechanism that combines the output of the traveling transmission and the two outputs of the split output mechanism and transmits the combined output to the left and right traveling units. It is arranged so that the traveling speed is controlled by operating the traveling operation unit, the turning speed is changed by the operation of the steering operation unit, and the traveling speed of the left and right traveling units is made different. Forward / reverse switching of the output direction of the traveling transmission There is provided cents riding work vehicle, characterized in that interposed forward and reverse output switching mechanism for switching forward and reverse output direction conjunction with.

The present invention has the following features.

The traveling transmission may be a continuously variable transmission capable of steplessly shifting in forward and reverse directions.

[0012] Between the turning transmission and the split output mechanism, output can be transmitted from the turning transmission to the split output mechanism, but output cannot be transmitted from the split output mechanism to the turning transmission. The one-way power transmission mechanism is interposed.

[0013] The one-way power transmission mechanism is a worm gear in which a worm is operatively connected to a turning transmission and a worm wheel is operatively connected to a split output mechanism.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are as follows.

A transmission for interlocking with the engine and capable of steplessly shifting in the forward and reverse directions, and an interlocking connection with the engine in parallel with the transmission, and the operation of the steering operation unit in the forward and reverse directions. A step-variable turning transmission, a split output mechanism that is connected in series with the turning transmission in series and splits the output of the turning transmission into two complementary outputs, and a traveling shift A right and left power combining mechanism that combines the output of the engine and the forward and reverse outputs of the split output mechanism and transmits the combined output to the left and right traveling units, and outputs the output of the engine to the traveling transmission and the turning transmission. The output of the traveling transmission and the forward / reverse output of the split output mechanism are combined by the left and right power combining mechanism and transmitted to the left and right traveling sections, and the steering operation section operates. It is configured to perform turning by making the running speed of the left and right running parts different, Also, between the engine and the turning transmission, a forward / reverse output switching mechanism that switches the output direction between forward and reverse in conjunction with forward / reverse switching of the output direction of the traveling transmission is provided, and the above-described reverse handle phenomenon occurs. To prevent it from occurring.

In this embodiment, the speed ratio can be set in either the forward or reverse direction for the traveling transmission and the turning transmission, and the input can be steplessly shifted and output in accordance with the speed ratio. Using a hydrostatic continuously variable transmission that allows the vehicle to travel at the optimal speed for work. In particular, the turning transmission can change gears according to the above gear ratio regardless of whether the input rotation direction is forward or reverse. The left and right power combining mechanism operates normally.

Further, a one-way power transmission mechanism comprising a worm gear interlockingly connected to the turning transmission and a worm wheel interlockingly connected to the split output mechanism is provided between the turning transmission and the split output mechanism. The transmission can be transmitted from the turning transmission to the split output mechanism, but the output cannot be transmitted from the split output mechanism to the turning transmission. To prevent the vehicle from spinning and to improve the straightness.

[0018]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a passenger work vehicle A according to the present invention. The passenger work vehicle A is provided with a rectangular frame-shaped traveling part frame 1 which is disposed substantially horizontally, and has large front and rear ends. The front and rear rolling wheels 2, 3 having the same diameter are pivotally supported, and the small-diameter intermediate rolling wheels 4, 4, 4 are pivotally supported on the lower left and right intermediate portions of the traveling portion frame 1, respectively. The driving sprocket 5 is supported at the upper rear side, and the front and rear rolling wheels on the left and right sides are respectively supported.
A crawler belt 6 is wound around the outer periphery of the intermediate rolling wheels 4, 4, 4 and the driving sprocket 5 to form a pair of left and right traveling parts 7L, 7R of a crawler type.

On the upper surface of the running section frame 1, a round pipe is bent through four columns 8 so as to be substantially rectangular in side view.
A main frame 9 formed in a substantially rectangular frame shape in plan view is mounted, and a steering column 10 is erected at a front end of the main frame 9, and on a top surface of the steering column 10,
A steering wheel 11 as a steering operation unit S is provided,
A seat 12 is arranged in the center of the main frame 9 slightly forward, a shift lever 13 as a traveling operation unit D is arranged on the side of the seat 12, and an engine E is arranged behind the seat 12.
The engine E is mounted on a tension clutch
A transmission case 16 disposed between the engine E and the traveling unit frame 1 via a belt transmission mechanism 15, 15 having a PTO shaft 17, which is mounted on an intermediate rear surface of the rear support 8. It is linked to and linked to Further, the outer periphery of the engine E except for the lower part is covered with a hood 18.

FIG. 2 shows a power transmission system F in the transmission case 16. The power transmission system F is composed of a hydrostatic continuously variable transmission, and is operated by operating a transmission lever 13 as a traveling operation unit D. A traveling transmission 20 capable of changing the speed in a forward and reverse stepless manner with a set rotation direction and a transmission ratio, a two-stage transmission 21 capable of shifting the output of the traveling transmission 20 in two levels, high and low, and The transmission 20 comprises a gear type forward / reverse switching mechanism 22 for switching the output rotation direction between forward and reverse in conjunction with the output rotation direction switching, and a hydrostatic continuously variable transmission, and the rotation set by the operation of the steering wheel 11. A turning transmission 23 capable of changing the speed and the speed in a forward and reverse stepless manner, a split output mechanism 24 for splitting the output of the turning transmission 23 into two complementary outputs, and The output of the machine 21 and the output split into two by the split output mechanism 24 are combined and A left and right planetary gear mechanism as the right and left power combining mechanism 25L and 25R that outputs to the traveling units 7L and 7R is configured. The traveling transmission 20, the two-stage transmission 21, and the sun gear of the left and right power combining mechanism 25L and 25R are configured. 26L and 26R are sequentially linked in the order described above, while the forward / reverse switching mechanism 22, the turning transmission 23, the split output mechanism 24, and the left and right power combining mechanism 25L,
The 25R ring gears 27L and 27R are sequentially linked in the above order. In the figure, 28 is a planetary gear, 29 is a chain transmission mechanism, 30 is a coupling, 31 is a shifter, 32 is a dog, 34
Is an intermediate reduction gear, and 35 is a parking brake.

In the above-mentioned hydrostatic continuously variable transmission, the input rotary power is temporarily converted into hydraulic energy by a hydraulic pump, and the hydraulic energy is converted into rotary power again by a hydraulic motor and output. At least one of the pump and the hydraulic motor is configured as a variable displacement type, and the speed ratio can be set in either the forward or reverse direction. Transmission 23
The right and left power combining mechanisms 25L and 25R are normally operated by using a gear that can be shifted according to the gear ratio regardless of whether the input rotation direction is forward or reverse.

With the above configuration, the power transmitted from the engine E through the belt transmission mechanism 15 is transmitted to the traveling transmission 20.
And forwards to the forward / reverse switching mechanism 22 for transmission.
Is transmitted in the rotation direction and the gear ratio set by the speed change lever 13 of the traveling operation unit D, and the two-stage transmission 21
Through left and right power combining mechanism 25L, 25R Sun gear 26L, 26R
Is transmitted to On the other hand, the power transmitted to the forward / reverse switching mechanism 22 is shifted by the turning transmission 23 in the rotation direction and gear ratio set by the steering wheel 11 and transmitted to the split output mechanism 24, where the power is transmitted to the split output mechanism 24. The ring gear 27 of the left and right power combining mechanisms 25L and 25R is divided into two complementary outputs.
L, 27R, and the right and left power combining mechanisms 25L, 25R combine the power transmitted to the sun gears 26L, 26R and the power transmitted to the ring gears 27L, 27R, respectively, to form the left and right traveling units 7L, 7R.
By driving R, the average of the speeds of the left and right traveling units 7L and 7R is proportional to the forward / reverse gear ratio of the traveling transmission 20 set by the shift lever 13, and the steering between the left and right traveling units 7L and 7R. By maintaining the speed difference proportional to the forward / reverse speed ratio set by the wheel 11, the left and right traveling units 7L and 7R are driven to smoothly turn the aircraft.

As described above, between the belt transmission mechanism 15 and the turning transmission 23, a forward / reverse switching mechanism 22 for switching the output direction forward / reverse in conjunction with forward / reverse switching of the output direction of the traveling transmission 20. Since the reverse handle phenomenon does not occur without using the above-described reverse handle prevention mechanism and the torque acting on the forward / reverse switching mechanism 22 is small, the strength of the forward / reverse switching mechanism 22 is reduced. In addition, the interlocking with the forward / reverse switching of the output direction of the traveling transmission 20 can be facilitated.

Further, since the traveling transmission 20 is a hydrostatic continuously variable transmission capable of steplessly shifting in the forward and reverse directions, the machine body can be driven at an optimum speed for work.

FIG. 3 shows a turning transmission 23 and a split output mechanism 24.
Between the worm gear as the one-way power transmission mechanism 40
Another embodiment is shown in which an intervening member 41 is provided to prevent idling of the turning transmission 23 due to the reaction force of the running resistance, thereby improving the straightness.

In this embodiment, the output shaft of the turning transmission 23
A worm 44 is interlocked to the worm gear 42 via a miter gear 43, and a worm wheel 45 meshed with the worm 44 is split and output.
24, the power transmission from the turning transmission 23 to the split output mechanism 24 is possible, but the split output mechanism is
The transmission of power from the transmission 24 to the turning transmission 23 is disabled, so that idling of the turning transmission 23 due to the reaction force of the running resistance is prevented.

FIGS. 4 and 5 show a balance weight mounting structure 50 for properly adjusting the longitudinal balance of the body, and two guide pipes extending in the longitudinal direction on the left and right sides of the front edge of the main frame 9. The support rods 5 are fixed to the respective guide pipes 51 and 51 and extend in the front-rear direction.
2 and 52 are slidably inserted in the front and rear direction, and a connecting plate 53 extending in the left-right direction is installed between the front ends of the support rods 52 and 52, and a predetermined number of balance weights 54 are mounted on the connecting plate 53. Further, the rod end of the balancing hydraulic cylinder 56 is connected via a connecting member 55 having a substantially U-shape in a plan view and opened forward in the center of the rear surface of the connecting plate member 53, and the hydraulic cylinder for balancing is connected.
Connect the bottom side of 56 to the bracket 57 provided on the aircraft,
By the expansion and contraction operation of the balance hydraulic cylinder 56, the balance weight 54 is moved back and forth so that the front-rear balance of the machine body can be properly adjusted.

FIG. 6 shows another embodiment in which the parking brake 35 can be operated by the shift lever 13 to simplify the operation. Among the operation patterns 60 of the shift lever 13, FIG.
A parking brake position PB is set to the side of the first speed position 61 which is the lowest speed position, and when the shift lever 13 is operated to the parking brake position PB, the parking brake 35 is operated. In the drawing, 62 to 66 indicate second to sixth speed positions, and 67 indicates a guide hole formed in the guide plate.

As described above, since the parking brake position PB is set on the side of the first speed position 61, the structure is simplified without the need for a parking brake lever or a link mechanism for this purpose. When the vehicle starts from the parking state, the vehicle always passes through the first speed, so that the vehicle can be reliably started at a low speed and safety can be improved.

[0031]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the engine, a traveling transmission linked to the engine and capable of shifting in forward and reverse directions by operating a traveling operation unit, and an engine in parallel with the traveling transmission. A turning transmission that can be steplessly shifted in the forward and reverse directions by operating the steering operation unit, and an interlocking connection that is linked in series with the turning transmission to complement the output of the turning transmission. A split output mechanism that splits the output into two outputs and a left and right power combining mechanism that combines the output of the traveling transmission and the two outputs of the split output mechanism and transmits the combined output to the left and right traveling units are provided. The traveling speed is controlled by operating the traveling operation unit,
By turning the steering operation unit, the traveling speed of the left and right traveling units is made different to perform turning travel, and between the engine and the turning transmission, forward / reverse switching of the output direction of the traveling transmission is performed. By interposing a forward / reverse output switching mechanism that switches the output direction between forward and reverse in conjunction with the above, the occurrence of the reverse handle phenomenon can be prevented, and the reverse handle prevention mechanism is not required.
The structure is simplified, and the cost can be reduced.

Also, since the forward / reverse output switching mechanism is interposed between the engine that does not act on a large torque and the turning transmission, the strength of the forward / reverse output switching mechanism can be small, and the large torque Does not work, and there is an effect that interlocking with forward / reverse switching of the output direction of the traveling transmission is performed smoothly.

According to the second aspect of the present invention, since the traveling transmission is a continuously variable transmission capable of continuously changing the speed in the forward and reverse directions, the body can be run at an optimum speed for the work. Efficiency and work quality can be improved.

According to the third aspect of the present invention, power can be transmitted from the turning transmission to the split output mechanism between the turning transmission and the split output mechanism. By providing a one-way power transmission mechanism that cannot transmit power to the machine, it is possible to prevent idling of the turning transmission and improve straightness.

According to the fourth aspect of the present invention, the one-way power transmission mechanism is a worm gear in which the worm is linked to the turning transmission and the worm wheel is linked to the split output mechanism. A power transmission function can be realized, and idling of the turning transmission can be prevented without requiring a separate operation.

[Brief description of the drawings]

FIG. 1 is a side view of a passenger work vehicle according to the present invention.

FIG. 2 is an explanatory diagram of a power transmission system.

FIG. 3 is an explanatory diagram of a power transmission system according to another embodiment.

FIG. 4 is a side view of a balance weight mounting structure.

FIG. 5 is a plan view of a balance weight mounting structure.

FIG. 6 is a plan view showing an operation pattern of a shift lever.

[Explanation of symbols]

 A Passenger work vehicle D Running operation unit E Engine S Steering operation unit 7L Left running unit 7R Right running unit 20 Running transmission 22 Forward / reverse switching mechanism 23 Turning transmission 24 Split output mechanism 25L Left power combining mechanism 25R Right power Combination mechanism 40 One-way power transmission mechanism 41 Worm gear 44 Worm 45 Worm wheel

Claims (4)

[Claims] 1. An engine (E), a traveling transmission (20) that is interlocked with the engine (E), and is capable of shifting in forward and reverse directions by operating a traveling operation unit (D); A turning transmission (23) that is interlocked with the engine (E) in parallel with the engine (20) and is capable of steplessly shifting in the forward and reverse directions by operating the steering operation section (S);
A split output mechanism (24) serially and operatively connected to the turning transmission (23) to split the output of the turning transmission (23) into two complementary outputs and output the divided output mechanism (24); The output of 20) and the two outputs of the split output mechanism (24) are combined, and
(7L) (7R) The right and left power combining mechanism (25L) (25R) for transmitting to the (7R) is arranged, the traveling speed is controlled by operating the traveling operation section (D), and the steering operation section (S) is operated. By left and right traveling part (7L) (7R)
The traveling speed of the traveling transmission (20) is changed between forward and reverse switching between the engine (E) and the turning transmission (23). And a forward / reverse switching mechanism (22) for switching the output direction between forward and reverse. 2. The passenger work vehicle according to claim 1, wherein the traveling transmission (20) is a continuously variable transmission capable of steplessly shifting in forward and reverse directions. 3. The turning transmission (23) and a split output mechanism (2).
4), the output transmission from the turning transmission (23) to the split output mechanism (24) is possible, but the output transmission from the split output mechanism (24) to the turning transmission (23) is possible. 3. The passenger work vehicle according to claim 1, further comprising an impossible one-way power transmission mechanism. 4. The worm gear, wherein the one-way power transmission mechanism (40) has a worm (44) interlockedly connected to a turning transmission (23) and a worm wheel (45) interlockingly connected to a split output mechanism (24).
The passenger work vehicle according to any one of claims 1 to 3, wherein (41).