JPH0421710Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a power transmission device for a combine harvester.

(Prior Art) Typically hydraulically driven transmissions, i.e.
HST consists of a combination of a variable displacement pump and a fixed displacement motor.The piston inside the variable displacement pump performs rotational and reciprocating motion to absorb and discharge oil. ”
The piston of the constant displacement motor is actuated by the "discharge" action and performs a rotational reciprocating motion, thereby rotating the hydraulic motor. The work equipment moves neutrally, forwards, or backwards depending on whether the swash plate of the hydraulic pump is upright, tilted to the right, or tilted to the left.If you change the angle of the swash plate and increase the pump output, the output torque of the HST remains constant. The output rotation speed increases.

However, with HST, it is difficult to stop the movement of the piston, and if even a small amount of oil flows into the hydraulic motor, the motor will start rotating, creating the risk of the combine starting to move.

By the way, as devices capable of stopping a vehicle, devices such as Japanese Patent Application Laid-open No. 102729/1982 and Publication No. 8811 of 1982 have been proposed.

(Problems to be Solved by the Invention) The device disclosed in Japanese Patent Application Laid-Open No. 102729/1983 can immobilize the vehicle when the driver releases the handle, but no consideration is given to the relationship with HST.

In addition, the one disclosed in Japanese Utility Model Publication No. 50-8811 has a bypass valve installed in parallel with the hydraulic motor in the conduit connecting the oil pump and the hydraulic motor, and the bypass valve is linked with the brake pedal to prevent the hydraulic motor from flowing in the event of an emergency stop. This system bypasses the oil supply midway through the system to rapidly reduce the amount of oil and apply braking force at the same time.When the brake pedal is depressed, the bypass acts as a clutch, but it consumes power as it continues to rotate the hydraulic pump. There are drawbacks.

Therefore, this proposal is for a combine harvester that uses a hydraulic drive transmission but can be stopped reliably in an emergency such as when the driver leaves his/her seat due to parking, etc., and does not keep the oil pump running when stopped. The purpose is to use a power transmission device.

(Means for Solving the Problems) In order to achieve the above objectives, the present invention provides the following power transmission device for a combine harvester.

That is, a drive device such as a reaping or traveling device is connected to the output shaft of the hydraulic drive transmission,
Its input shaft is connected via a clutch to the output shaft of the engine that directly drives the handling cylinder, and is configured so that only the swash plate of the pump of the hydraulic drive transmission can be operated with a manual lever, allowing the driver to drive the vehicle when parking, etc. This is a power transmission device for a combine harvester in which a foot pedal, a clutch, and a parking brake are interlocked and connected so that when leaving the seat or in an emergency, the clutch is disengaged and the parking brake is also operated.

(Function) In the proposed system, the swash plate of the pump is controlled by a manual lever, but the swash plate control and clutch are independent, and when parking, etc., the clutch can be released and the parking brake can be activated. Even if the clutch is released, the engine can still drive the handling barrel.

(Example) The embodiments shown in the drawings will be described below.

FIG. 1 shows the entire combine harvester. Grain culms are divided by a weeding board 1, raised by a pulling device 2, and cut by a reaping device 3. The grain culms are sent to a feed chain of a threshing machine 15 by a conveying device 4. Threshing machine 1
The paddy is threshed at 5, and the threshed paddy is stored in a tank 6.

The illustrated engine 7 is arranged behind the paddy receiving tank 6, the driver's seat 8 is arranged in front of the paddy receiving tank 6, and these are mounted on crawlers 9.

The power transmission device of the combine harvester as described above is the second
As shown in the figure, power is transmitted from the pulley 10 of the engine 7 via the belt 11 to the pulley 13 of the intermediate shaft 12, and the intermediate shaft 12 directly drives the threshing machine 15 with its pulley 14, and other A pulley 18 is moved from the pulley 16 via a clutch 17, which serves as an input side to operate the HST 19, and power is transmitted from the HST 19 to pulleys 21 and 22 that move the traveling device or the reaping device. Note that a sub-transmission device S is interposed between the HST pump and the motor.

The clutch 17 is constructed as shown in FIG.
That is, the belt 2 is placed between the pulleys 18 and 16.
3 is stretched and the tension pulley 24 is attached to the belt 23
It can be freely touched. Tension pull 24
The arm 25 is biased by a spring 26, is swingable about a fulcrum 27, and is connected to a foot pedal 28 on the step via a wire 29.

On the other hand, the petal 28 and the parking brake 30 are connected via a wire 31.
0 itself is constructed as follows.

That is, a brake drum 32 is fixed to an axle 31 of the crawler 9, and brake arms 35 and 36 having brake shoes 33 and 34 inscribed in this brake drum 32 swing about a fulcrum 37, and are normally supported by a spring 38. The brake shoes 33 and 34 have separated from the brake drum 32 and the brakes are no longer working, but when the pedal 28 is depressed, the lever 39 is moved by the wire 31 and the brake arms 35 and 36 are tensioned by the cam 40, and the brake drum 32 is moved. It is designed to brake.

On the other hand, an arm 41 that moves the swash plate of the HST 19 is connected to a manual lever 43 via a wire 42.

Normally, the manual lever 43 is operated and the arm 41 is used to change the angle of the HST swash plate to move the HST forward or backward. However, if the driver depresses the foot pedal 28 when parking or leaving the vehicle, or in an emergency, the clutch 1
7 is released, the parking brake 30 is activated and the aircraft can be stopped. Depress the fixed lever 5.
1, the foot pedal 28 can be fixed in its depressed position. Therefore, there is a feature that there is no need to be nervous when operating the manual lever 43 to set the HST to neutral. As shown in Figure 1, the driver's seat 8, paddy tank 6, and engine 7 are arranged from the front on the right side in the direction of movement of the machine, but in this case, conventionally, as shown in Figure 4, the engine 7 is arranged perpendicular to the working direction. The propeller shaft is driven by belt transmission consisting of pulleys 44, 45 and belt 46 from the output shaft 48, and the threshing device is then moved from the PTO case 50.
Power is transmitted to the reaping device and also to the traveling device.

In such conventional V-belt transmission, the distance between the cores is long. Also, the number of belts increases depending on the transmission capacity, and it is said that the more belts, the better.

Therefore, there is not enough space in the paddy receiving tank 6, and when it is desired to tighten the belt, it is inconvenient that the paddy bag etc. must be removed. In other words, the maintenance aspects of the engine (dynamo, fan, oil, pump, etc.) are located on the side of the paddy receiving tank, making inspection difficult.

However, by making the output shaft 48 of the engine parallel to the working direction as shown in Figures 5 and 6, the engine 7
After the propeller shaft 49 is driven by belt transmission, the PTO case 50 is installed to distribute the power to threshing, reaping, and running.
pumps, etc.) are on the outside, making inspection easier.

(Effects of the present proposal) According to the proposed method, the swash plate of the pump is controlled by a manual lever, but the swash plate control and clutch are independent, and when parking, etc., the clutch must be released and the parking brake must be activated. Since it can be stopped in the same way as a conventional transmission, it does not require much effort to bring the pump's swash plate to the neutral position using a manual lever. The input shaft of the hydraulic drive transmission is then disconnected from the output shaft of the engine by the clutch, so when the combine is stopped, the hydraulic pump does not continue to run and power is transferred to the hydraulic drive transmission. It is characterized by being able to divert excess power to the handling barrel without being consumed, allowing manual handling work to be carried out with ease.

[Brief explanation of the drawing]

Figure 1 is a front view of the entire combine harvester, Figure 2 is a layout diagram of the power transmission device of the proposed device in the combine harvester, Figure 3 is an explanatory diagram of the proposed device, and Figure 4 is a layout diagram of the power transmission device in the conventional combine harvester. , 5 and 6 are layout diagrams of a power transmission device in a combine harvester different from that in FIG. 2. 7...Engine, 17...Clutch, 19...
HST, 28...foot pedal, 30...parking brake, 43...manual lever.

Claims (1)

[Scope of utility model registration request] A drive device such as a reaping or traveling device is connected to the output shaft of the hydraulic drive transmission, and its input shaft is connected via a clutch to the output shaft of the engine that directly drives the handling cylinder. The swash plate of the pump is constructed so that only the swash plate of the pump can be operated with a manual lever, and the foot pedal, clutch, and parking lever are configured so that when the driver leaves the driver's seat such as when parking or in an emergency, the clutch is disengaged and the parking brake is also activated. A power transmission device in a combine that is interlocked with a brake.