JP2002017003A - Traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome a risk such that, in a hybrid vehicle that is provided with a plurality of prime bars of an engine and an electric motor and that is designed to normally travel by driving the engine continuously and to increase the driving force, by driving the electric motor when a traveling load of a certain level or more occurs to the vehicle, the motor becomes incapable of assisting the driving force of the engine properly unless a detecting device for detecting the traveling load of the vehicle detects the load accurately. SOLUTION: In the vehicle of the structure above, an oil pressure-detecting device 27 that detects the pressure of oil is provided in a piping route 26 between a hydraulic pump 15 driven by the engine 3 and a hydraulic valve 16. This oil pressure-detecting device 27 is interlocked and associated with a transforming device 28 that supplies electric power to the oil pressure detecting device 27 and the motor 23. When the oil pressure-detecting device detects an oil pressure drop of a certain level or less, the transforming device 28 drives the motor 23 to assist the driving force of the engine 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a traveling vehicle that travels by driving a plurality of prime movers.

[0002]

2. Description of the Related Art A hybrid vehicle equipped with a plurality of prime movers is known in automobiles and the like. In the related art, usually, one of the plurality of prime movers is driven by a constant drive of a primary prime mover, and when a running load exceeding a certain level is generated in a vehicle, a secondary prime mover is operated in accordance with the running load. In some cases, the driving force is increased by driving the motor.

[0003]

However, if the detecting device for detecting the running load of the vehicle does not accurately detect the running load, the driving force may not be properly assisted by the secondary motor. According to the present invention, when a predetermined traveling load is applied,
The driving force is detected by the pressure of oil sent from a hydraulic pump linked to the primary motor, and the driving force is increased by the secondary motor so that the traveling driving force is appropriately maintained.

[0004] Therefore, the present invention has taken the following technical measures.

[0005]

That is, a specific means for solving the problems in the present invention is a traveling vehicle that runs on a vehicle driven by a primary motor and a secondary motor, and is usually driven by the primary motor. And a hydraulic pressure detection device for detecting the pressure from a hydraulic pump driven by the primary motor is provided, and the hydraulic detection device and a drive control device for controlling the driving force of the secondary motor are linked and linked, When the oil pressure detecting device detects a predetermined pressure decrease, the drive control device drives the secondary motor to assist the driving force of the primary motor.

[0006]

Therefore, according to the present invention, since a predetermined traveling load is applied to the vehicle by the hydraulic pressure detecting device for detecting the hydraulic pressure from the hydraulic pump linked to the primary motor, the primary The state of the prime mover can be accurately grasped, so that the secondary prime mover can appropriately assist the driving force and keep the traveling driving force of the vehicle properly.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a four-row walking rice transplanter as an example of a traveling vehicle. This rice transplanter (vehicle body 1) is configured to travel by driving a pair of left and right paddy wheels 2 and 2. An engine 3 serving as a primary motor is mounted at a front portion of the vehicle body 1, and output from the engine 3 via a transmission case 4, left and right traveling extension cases 5 and 5 and left and right traveling chain cases 6 and 6. Then, the right and left paddy wheels 2, 2 mounted on the traveling chains 6, 6 are driven.

The front end of the main frame 7 is fixed to the back side of the transmission case 4, and the rear end of the main frame 7 comprises a planting device 8, a seedling storage tank 9, and the like. Working device 1
Planting frame 1 that doubles as a transmission case for transmitting power to zero
1, and a rear frame 12 is attached to the rear of the planting frame 11. The rear frame 12 has a middle portion curved upward and a rear end side extending obliquely rearward and upward. And this rear frame 1
At the upper end of 2, a steering handle 13 is provided in a protruding manner.

[0009] Side clutch levers 14 and 14 are provided below the left and right grips of the steering handle 13, and the operation of the side clutch levers cuts off one of the left and right ones of the left and right paddy wheels 2, 2. The direction of the body is corrected or the body is turned.

A hydraulic pump 15 is provided on the side of the transmission case 4, and a hydraulic valve unit 16 is provided on the upper surface. The hydraulic lifting / lowering cylinder 17 constitutes a hydraulic lifting / lowering device. When the hydraulic lifting / lowering cylinder 17 is expanded and contracted, the left and right swing arms 18 and 18 rotate back and forth by the same angle, and the left and right wheels 2 and 2 are moved by the same amount. Only the aircraft moves up and down with respect to the aircraft, and the aircraft moves up and down. When the length of the left connecting rod 20 is changed by expanding and contracting the rolling hydraulic cylinder 19, the left swing arm 18 rotates, and only the left wheel 2 moves up and down with respect to the body. , To change the inclination of the aircraft in the left-right direction.

Power is transmitted from the transmission case 4 to an input portion of the gear box 11a via a planted transmission shaft 22. The transmitted power is transmitted to the planting device 8 via a transmission shaft in the planting chain 11b and the connecting pipe 11c. As shown in FIG. 3, an electric motor 23 for assisting driving of the vehicle is mounted near the engine 3. Therefore, the electric motor 23 serves as a secondary motor. The hydraulic pump 15 is provided with a gear 24a,
24b. The hydraulic pump 15 and the motor 23 are interlocked and connected via a one-way clutch 25.

In FIG. 4, a hydraulic pressure detecting device 27 for detecting the oil pressure is provided in a piping path 26 between the hydraulic pump 15 and the hydraulic valve unit 16, and the hydraulic pressure detecting device 27 And is linked to a transformer 28 for supplying power to the
Detects a decrease in oil pressure equal to or lower than a predetermined value, the power transmitted to the motor is increased by the operation of the transformer 28, and the motor 23 is strongly driven to assist the driving force of the engine. There is. Therefore, the transformer 28 serves as a drive control device for controlling the driving force of the motor 23.

In other words, during operation, the fact that the running load or the load on the hydraulic device is increased in wet fields or the like and the load on the engine is reduced and the engine rotation is reduced is detected by the pressure of the oil sent from the hydraulic pump. To assist the driving force of the engine. Therefore, according to this, it is possible to prevent a problem such as a drop in the engine rotation and an inability to run. The transformer 28 is connected to a battery 29.

Further, the load of the engine 3 is detected by detecting the pressure from the hydraulic pump 15 which is driven in conjunction with the engine 3 in order to raise / lower or tilt the body horizontally. No special detection device for detection is required, the weight and size of the body can be reduced, and this load can be detected with high accuracy.

In the embodiment shown in FIG. 5, a generator 31 is provided in a pipe return path 30 that returns from a hydraulic pump 15 through a hydraulic valve 16 (or a hydraulic elevating cylinder 17) to the transmission case 4, and a hydraulic oil Power generation by the flow of
The battery 29 is charged.

Referring to FIG. 6, in a walking rice transplanter having an auxiliary drive device using a motor in addition to the engine, when the engine speed is low (when the throttle lever is low), hydraulic pressure is applied by the motor. It is configured to keep the operation speed at an optimum value so that the operation speed of the device does not decrease.

That is, in the walking type rice transplanter, the body is lifted when turning on the headland, but at this time, generally, the operating speed of the hydraulic pressure decreases because the engine speed is reduced. In this embodiment, even when the engine speed is reduced, the hydraulic motor 33 pumps oil to the hydraulic elevating cylinder 17 via the hydraulic valve 16 so that the hydraulic operating speed does not decrease, and the machine body can be lifted quickly. Turning can also be easily performed. In short, when the engine speed falls below a certain level, the oil is fed by motor assist via the bypass circuit 32.

Another embodiment 1 (FIGS. 7 and 8) will be described. In the hybrid walking rice transplanter, the main body of the motor 23 is projected outward from the hood 34. The running system is driven by the engine 3 and the planting system is driven by the motor 23. That is, the wheels 2 are driven by the engine 3 via the transmission case 4 and the traveling chain case 6, and the motor 23
Drives the seedling planting operation device 10 via the planting transmission shaft 22. The battery 29 may be provided at the forefront of the apparatus in consideration of the front-rear balance.

At present, the muffler 35 is located inside the hood 34, and the temperature in the hood is high. In addition to this, the motor also generates heat, so that the inside of the hood becomes extremely hot and the efficiency of the motor is reduced. Therefore,
According to the first embodiment, by exposing the motor to the outside of the hood, no heat is stored in the hood and the motor is cooled, so that the efficiency does not decrease. In addition, since the engine is loaded only on the traveling system, a small engine with small horsepower is sufficient.

Another embodiment 2 (FIG. 9) will be described. In the hybrid walking rice transplanter, the motor 23 in this embodiment is installed at a position opposite to the installation side of the muffler 35 with the engine 3 therebetween in the left-right direction of the body. The motor itself generates heat when driven, and its working efficiency deteriorates at extremely high temperatures. Therefore, by installing a motor on the opposite side of the muffler, the influence of heat generated by the muffler on the motor can be minimized.

Another embodiment 3 (FIG. 10) will be described.
In the hybrid walking rice transplanter, the battery 29 in this embodiment is located forward of the axle of the wheel 2 and
It is located behind the engine 3. By arranging the battery in front of the axle, the effect of the first embodiment is less. However, the front-rear balance is improved, and by arranging the battery in the rear of the engine, the overall length of the fuselage can be reduced.

Another embodiment 4 (FIGS. 11 and 12) will be described. In the hybrid walking rice transplanter, the assist motor 23 functions as a cell motor when the engine 3 is started. Therefore, a cell motor gear box 36 is provided between the engine 3 and the assist motor 23.

The relatively heavy battery 29
Is mounted at the front of the mission case 4 and the engine 3 is installed above them. Since the assist motor also serves as a cell motor, a dedicated cell motor is not required, which simplifies the configuration and improves workability. Further, by arranging the engine over the front and rear batteries and the upper part over the transmission case, the front and rear balance can be maintained well.

[Brief description of the drawings]

FIG. 1 is a side view of a walking rice transplanter.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view of an essential part of the embodiment.

FIG. 4 is a block diagram.

FIG. 5 is a perspective view of a main part.

FIG. 6 is a perspective view of a main part.

FIG. 7 is a plan view of a walking rice transplanter according to another embodiment 1.

FIG. 8 is a side view of the same.

FIG. 9 is a plan view of a walking rice transplanter according to another embodiment 2.

FIG. 10 is a side view of a walking rice transplanter according to another embodiment 3.

FIG. 11 is a plan view of a walking rice transplanter according to another embodiment 4.

FIG. 12 is a side view of the main part of the above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Body, 2 paddy wheels 3 Engine 4 Mission case 5 Extension case 6 Running chain case 7 Main frame 8 Planting device 9 Seedling tank 10 Working device 13 Operating handle 15 Hydraulic pump 16 Hydraulic valve unit 17 Hydraulic lifting cylinder 22 Planted transmission shaft 23 Transmission motor 26 Piping route 27 Oil pressure detection device 28 Transformer 29 Battery

Claims (1)

[Claims] 1. A traveling vehicle which travels a vehicle by driving a primary motor and a secondary motor, and is usually configured to be constantly driven by a primary motor, and detects pressure from a hydraulic pump driven by the primary motor. A hydraulic pressure detection device is provided, and the hydraulic pressure detection device is linked to a drive control device that controls the driving force of the secondary motor, and when the hydraulic pressure detection device detects a predetermined pressure decrease, the drive control device controls the secondary drive. A traveling vehicle configured to drive a prime mover to assist a driving force of a primary prime mover.