JPH0538982Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a speed change lever mechanism for controlling the vehicle speed of a mobile agricultural machine.

(b) Conventional technology Conventionally, in mobile agricultural machinery, as seen in Japanese Utility Model Publication No. 57-42105, a speed change operation lever connected to a continuously variable transmission is moved in the same direction as a movable member to which frictional resistance is applied. In addition to being freely structured, the driving device is equipped with an engaging member that connects and disconnects the operating lever and the movable member, so that the operating lever can be friction-locked and unlocked at any shift position. A speed change operation mechanism has been devised.

In addition, there are devices in which the continuously variable transmission automatically changes speed according to the load,
In this configuration, as shown in FIGS. 6 and 7, a speed change operation lever c connected to a continuously variable transmission is loosely fitted onto the rotating shaft b of a motor a, which is controlled by a sensor that detects the engine load. , the lever c and the motor a are linked via a friction plate d to give priority to manual gear shifting operation over automatic control by the motor a, and a gear shift instruction lamp is connected to the lever c via a link mechanism e. The rotary switch f is connected to detect the gear shift position of the lever.

(c) Problems to be solved by the invention However, in the above configuration, the rotary switch that detects the gear shift position and turns on the gear shift instruction lamp is connected to the gear shift operating lever via the link mechanism. This has disadvantages in that detection errors occur due to backlash, etc., and complicated adjustment work is required to align the shift position of the lever with the switching position of the rotary switch.

(d) Means for solving the problem This invention consists of a gear shift operating lever that is interlocked with the hydrostatic transmission and fixed to a support shaft, a motor for controlling the gear shifting operating lever, and a work load. The control motor, which is automatically controlled according to the output of the sensor, and the speed change operation lever are interlocked via a friction plate, and the speed change operation lever is provided at one end of the support shaft. It is an object of the present invention to provide a speed change lever mechanism for vehicle speed control of a mobile agricultural machine provided with a rotary switch for detecting the speed change shift position of the lever.

(e) Function/Effect According to this invention, the rotary shaft of the rotary switch that detects the gear shift position on the hydrostatic transmission side is directly fixed to the support shaft to which the gear shift operation lever is fixed, so that the rotary switch There is no play between the switch and the gear shift operation lever, and the gear shift position can be detected accurately. Furthermore, it becomes extremely easy to align the shaft position of the speed change operation lever and the switching position of the rotary switch.

(f) Examples Examples of the present invention will be specifically explained based on the drawings.

Fig. 5 shows a general-purpose combine-in according to the present invention, in which numeral 1 is the aircraft base, and at the front upper part and on the right side in the direction of travel, there is a cockpit 2 with a cabin, a grain tank 3, and a grain tank 3. In addition to mounting an engine, traveling crawlers 4 are provided on both sides of the lower part, and a threshing section 5 is provided on the upper part of the machine base 1.
Further, a reaping section 6 is provided in front of the machine stand 1, and the engine is interlocked and connected to the traveling crawler 4, the threshing section 5, and the reaping section 6, so that the traveling crawler 4 and the threshing section are connected as the engine is driven. Rotational power is transmitted to the section 5 and the reaping section 6, respectively.

The reaping section 6 is composed of a grain header 7 and a transport chamber 8 for the reaped grain culm extending from the header 7 toward the threshing section 5 side.
In addition to supporting the raking reel 9, the cutting blade 10, and the raking drum 11, a chain conveyor 12 is provided inside the transfer chamber 8, and the raking reel 9 of the grain header 7 moves the grain culm inward. Scrape the cutting blade 10
The reaped grain culm is harvested by the cutting blade 10, and the reaped grain culm is sent into the transfer chamber 8 by the scraping drum 11, and transferred to the threshing section 5 side by the chain conveyor 12 in the transfer chamber 8. It's like being transported.

The threshing section 5 rotatably supports an axial flow type handling cylinder 14 on the upper part of the main body casing 13, has a swinging sorting device 15 below it, and performs sorting processing using sorting air blown from a sorting fan 17. , the first grain is stored in the grain tank 3, and the second grain is stored in the second reduction cylinder 18.
The straw is returned to the handling room for re-threshing, and straw waste is discharged outside.

In such a combination vehicle, a hydrostatic transmission (hereinafter referred to as HST) 19 is interposed between the engine and the traveling crawler 4, and the HST 19 is operated by a shift operation lever 31 to change from forward to reverse. The bottom surface of the transfer chamber 8 and the
A sensor 20 that detects the flow rate of the harvested grain pole, that is, the load, is arranged between the chain conveyor 12, and the HST 19 is controlled by the detection output of the sensor 20, so that the flow rate of the harvested grain pole is controlled during grain harvesting work. When the flow rate decreases, the speed increases, and when the same flow rate increases, the speed decreases, and the flow rate of the reaped grain rods transferred to the threshing section 5 is kept constant.

The HST 19 is composed of a bidirectional variable displacement hydraulic pump 21 connected to the engine E, and a bidirectional constant displacement hydraulic motor 22 hydraulically connected to the pump 21. It is connected to the traveling crawler 4.

The sensor 20 is connected to a front end pulley 23 of the chain conveyor 12 in the transfer chamber 8 as shown in FIG.
An opening 24 is provided in the inner bottom surface 27 of the lower transport chamber 8, and a detection body 26 urged by a torsion spring 25 is protruded from the opening 24 into the transport chamber 8 to transport the inside of the transport chamber 8. The detector 26 is brought into contact with the harvested grain pole, and the amount of deviation of the detector 26 is electrically detected via a rotary variable resistor 28, and the detection output from the sensor 20 is controlled. A control motor 32 is inputted to a device 29 and is connected to a speed change operation lever 31 provided in the cockpit 2 via the device 29.
is under control. And the same speed change operation lever 31
is operatively connected to the capacity changing section 30 of the hydraulic pump 21 of the HST 19.

The above-mentioned speed change operation lever 31 and control motor 32
As shown in FIGS. 1 and 2, a control motor 32 is fixed to a support frame 33 provided near the cockpit 2, and rotatably mounted on the support frame 33 via a reduction gear 34. The control motor 32 is interlocked with a large-diameter final reduction gear 36 that is loosely fitted onto the support shaft 35.

Further, a lever support block 37 connected to the base end of the speed change operation lever 31 is fixed to the support shaft 35, and a friction plate 38 is fixed to the side surface of the block 37 facing the final reduction gear 36. A washer-like friction plate 39 is sandwiched between the plate 38 and the gear 36, and a further spring 40 urges the final reduction gear 36 in the direction of the lever support block 37.

In addition, 41 in the figure is a thrust ball bearing,
42 indicates a locking nut.

Therefore, when the flow rate of the harvested grain rods being transported through the transport chamber 8 decreases (increases), the sensor 20 detects this and operates the control motor 32 via the control device 29 to reduce the friction. Through the plate 39,
The speed ratio of the HST 19 is automatically changed by rotating the speed change operation lever 31 in the direction of speed increase (deceleration), thereby performing an operation to maintain a constant flow rate of the harvested grains fed to the threshing section 5.

In particular, the control motor 32 that rotationally controls the speed change operation lever 31 is operated via a friction plate 39.
Since the transmission is transmitted to the speed change operation lever 31 in conjunction with the HST 19, the manual operation of the speed change operation lever 31 by the driver is prioritized, regardless of the above-mentioned automatic control operation.

Further, a connecting portion 44 with a stud bolt 43 is provided protruding from the lower end of the lever support block 37, and the connecting portion 44 is connected to the capacity changing portion 30 of the HST 19 via a connecting rod 45.

Further, a rotary shaft of a rotary switch 46 that detects the gear shift position and switches the circuit of the gear shift instruction lamp 47 is fixed to one end of the support shaft 35 coaxially with the support shaft 35. Detects the gear shift status of HST19 by switching the circuit,
The shift instruction lamps 47, 47, . . . are turned on.

As mentioned above, the rotating shaft of the rotary switch 46 is fixed coaxially with the support shaft 35 to which the lever support block 37 to which the gear shift operating lever 31 is attached is fixed, so that the rotary switch 46 and the gear shifting operating lever 31 are connected to each other. There is no room for play or the like to occur between the two, and the operation of the shift operation lever 31 is accurately transmitted to the rotary switch 46.

[Brief explanation of the drawing]

FIG. 1 is a side view of the gear shift operation lever mechanism according to the present invention. FIG. 2 is a sectional view of FIG. 1. FIG. 3 is a side view of a sensor that detects workload. Fourth
The figure is a block diagram showing the configuration of the operation transmission system. Fifth
The figure is an overall side view of a combine harvester having the structure of the present invention. FIG. 6 is an explanatory front view showing a state in which a conventionally structured gear shift operation lever and rotary switch are connected. FIG. 7 is an explanatory side view of the same partial cross section. 19...Hydrostatic transmission (HST), 20...Sensor, 31...Speed control lever, 32...Control motor, 35...
Support shaft, 39...Friction plate, 46...Rotary switch.

Claims (1)

[Scope of utility model registration request] Hydrostatic transmission 19
A gear shift operation lever 31 that is interlocked with and fixed to a support shaft 35, a motor 32 for controlling the shift operation lever 31, and a sensor 20 that detects the workload are provided, and a sensor 20 that detects the work load is provided. The control motor 32 is automatically controlled by
and the speed change operating lever 31 are interlocked via a friction plate 39, and a rotary switch 46 is provided at one end of the support shaft 35 for detecting the speed change shift position of the speed change operating lever 31. A gear lever mechanism for controlling the vehicle speed of agricultural machinery.