JPH06211058A - Transmission gear for combine or the like - Google Patents

Abstract

PURPOSE:To use the main speed change transmission of a hydraulic stepless transmission in common for a travel transmission system and a reaping transmission system in the same transmission case so as to simplify constitution by integrating a travel transmission case part with a synchronous transmission case part. CONSTITUTION:A transmission gear for a combine or the like is formed by integrating a travel transmission case part with a synchronous transmission case part 7. The travel transmission case part is internally equipped with a gear for performing travel transmission by the power from a hydraulic stepless transmission(HST) capable of performing main speed change, through an auxiliary transmission gear 1, a travel clutch 2, and the like. The synchronous transmission case part 7 is internally equipped with a synchronous transmission gear 5 capable of performing synchronous speed change by the power from the HST so as to drive a reaping output shaft 4, and a constant speed transmission gear 6 for driving the reaping output shaft 4 not through the HST. The main speed change transmission of the HST is thereby used in common for a travel transmission system and a reaping transmission system in the same transmission case so as to simplify constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device such as a combine and the like, and a traveling transmission case portion having a traveling transmission device for transmitting a traveling device and a synchro transmission case portion having a cutting transmission device for transmitting a harvesting device. And the same transmission case.

[0002]

2. Description of the Related Art A traveling transmission device and a mowing transmission device of a combine are often provided in a transmission case separately from each other, and a conveying route for conveying the culm from the mowing device to the threshing device. It has a complicated structure underneath, and has a structure in which straw waste or the like is easily entangled.

[0003]

DISCLOSURE OF THE INVENTION The present invention has a built-in traveling transmission device which is transmitted from a hydraulic continuously variable transmission HST capable of main shifting and which travels through an auxiliary transmission 1 and a traveling clutch 2 inside. A traveling transmission case portion 3, a synchro transmission 5 for driving a reaping output shaft 4 capable of transmitting a reaper by transmitting power from the hydraulic continuously variable transmission HST to enable synchro gear shift, and the hydraulic continuously variable transmission. A constant speed transmission 6 for transmitting the cutting output shaft 4 at a constant speed without passing through the HST is integrated with an internal synchro transmission case 7 to constitute a transmission such as a combine.

[0004]

The hydraulic continuously variable transmission HST is driven from the engine side and is transmitted to the traveling device via the auxiliary transmission 1 and the traveling clutch 2. The main shift is performed by operating the hydraulic continuously variable transmission HST, the auxiliary shift is performed by operating the auxiliary transmission 1, and the steering or turning is performed by operating the steering clutch 2.

The hydraulic continuously variable transmission HST can be transmitted to the mowing output shaft 4 via the synchro transmission 5, and the gear cutting operation of the hydraulic continuously variable transmission HST causes the traveling speed of the traveling device to travel. Gear transmission in synchronization with
The constant speed transmission 6 can be selected and transmitted without synchronizing. Further, by changing the speed of the synchro transmission 5, it is possible to change the transmission ratio of the mowing speed to the traveling speed, and it is possible to select the mowing transmission corresponding to the conditions such as the fall of the grain stem and the unfallen.

In such a transmission form, in the same transmission case, the main transmission of the hydraulic continuously variable transmission HST can be shared by the traveling transmission system and the cutting transmission system passing through the synchro transmission 5. It is possible to simplify the configuration, and the traveling transmission device such as the sub transmission 1 and the steering clutch 2 and the harvesting transmission device such as the synchro transmission 5 and the constant speed transmission 6 are provided in the traveling transmission case portion 3 And the synchronous transmission case portion 7 can be installed in the same transmission case to form a simple structure.

[0007]

EXAMPLE A synchro transmission case portion 7 is located above the traveling transmission case portion 3 and is integrally molded to form a left-right split type transmission case. The outer case of the hydraulic continuously variable transmission HST is attached to one side. A sprocket shaft 10 of a sprocket 9 that drives a pair of left and right crawler traveling devices 8 is provided on both left and right sides at the lower end portion of the transmission case.

The traveling transmission case portion 3 has an input shaft 12 connected to an input HST input shaft 11 of the hydraulic continuously variable transmission HST and an output shaft 1 connected to an output HST output shaft 13.
4, the input shaft 12 is interlocked from the engine side, and the output shaft 14 is moved from the stopped state at the neutral position to the forward rotation side high speed position and the reverse rotation side high speed position by the shift operation of the hydraulic continuously variable transmission HST. It is possible to continuously transmit the speed change over.

Further, in the traveling transmission case portion 3, the intermediate shaft 15, the mowing output shaft 4 for transmitting to the mowing device, the auxiliary transmission shaft 20 coaxial therewith, the traveling clutch 16, the spin turn shaft 17, the steering brake shaft. 18, and the left and right traveling shafts 19 and the like are mounted, and gear transmission and clutch transmission are performed between them. A sub-transmission clutch 21 and high-speed and low-speed sub-transmission gears are provided on the sub-transmission shaft 20 so that the gear transmission from the output shaft 14 can be transmitted at high speed and low speed. The auxiliary transmission shaft 20 meshes with the center gear 22 of the steering clutch shaft 16. The cutting output shaft 4 meshes with an intermediate gear 23 rotatable around the intermediate shaft 15, and is transmitted from the transmission mechanism portion on the side of the synchronizing transmission case portion 7 to the pulley 2 at the outer shaft end.
4 has a cutting blade device, a grain culm moving device, a scraping device, a conveying device, and the like, and conveys the reaping device for threshing while conveying the slaughtered grain culm to the threshing device. Further, from this pulley 24, a feed chain for conveying grain culms, which is a part of the threshing device, is also interlocked.

On the steering clutch shaft 16, a pair of left and right multi-plate steering clutches 2 which are turned on and off by hydraulic pressure are provided. Through the steering clutch 2, the left and right sides of the center gear 16 are connected. The steering clutch gear 25 can be transmitted. 62 is a clutch cylinder. The spin turn shaft 17 is constantly meshed with the center gear 22, and has a spin turn clutch 26 which is turned on and off by hydraulic pressure and a spin turn gear 27 which is transmitted by the spin turn clutch 27 on both left and right sides. The transmission from 22 to the spin turn gear 27 via the spin turn shaft 17 can be turned on and off. 63 is a spin cylinder.

The steering brake shaft 18 includes a brake gear 28 that meshes with the left and right spin turn gears 27, and a brake case 29 integral with the travel transmission case 3 and the brake gear 28. A multi-plate steering brake 30 that is frictionally braked by hydraulic pressure is provided, and a wheel gear 31 on the traveling shafts 19 on opposite sides is meshed with the brake gear 28 to rotate the left and right crawler traveling devices 8. You can brake separately. 64 is a brake cylinder.

Further, each brake gear 28 on the steering clutch shaft 18 always meshes with the steering clutch gear 25 on the steering clutch shaft 16, and the steering clutch 2
Reverse rotation is also directly transmitted from the side. Therefore, during normal running, the spin-turn clutch 26 is disengaged so that the steering clutch gear 2
The wheel gear 31 can be rotated forward through the gear 5, the brake gear 28, and the like. However, when a steerable steering turn is performed, the steering clutch 2 on the steering side is disengaged, and the spin turn clutch 30 on the same side as the steering clutch 2 is turned on to turn the crawler traveling device 8 on the steering side. Rotate backward. Such operation timing is performed by program control in a controller having a microcomputer. The hydraulic circuit 58 includes a hydraulic pump P, a tank port T, and a relief valve 6.
It has 5 mag.

The synchro transmission case portion 7 has a synchro transmission shaft 32, an intermediate shaft 33, a constant speed clutch shaft 34, an intermediate shaft 35, and the like. The synchro transmission shaft 32 has a fall mode switching cylinder by hydraulic pressure. By the operation of 59, the low speed transmission side low speed synchronizing clutch 36 and the high speed transmission side high speed synchronizing clutch 37 can be alternately turned on and off. or,
The constant speed clutch shaft 34 has the synchro clutches 36, 3
The synchro clutch 38 that can transmit the transmission from the 7 side to the constant speed clutch shaft 34 and the constant speed clutch 39 for the constant speed transmission.
With the above, it is possible to perform switching transmission by the operation of the constant rotation switching cylinder 60 by hydraulic pressure. Reference numeral 61 is a switching control valve for switching between the fall mode switching cylinder 59 and the constant rotation switching cylinder 60.

The belt 40 is transmitted between the output shaft 14 and the synchro speed change shaft 32, the intermediate output shaft 35 is transmitted to the synchro speed change gear 23, and the harvesting output shaft 4 is transmitted. The gears are transmitted from the input shaft 12 to the constant speed clutch gear 41 of the constant speed clutch shaft 34. Therefore, the form of interlocking with the cutting output shaft 4 is such that the clutches 36, 3 are
By the on / off control of 7, 38, 39, the reaping transmission can be performed by dividing into the standard mode L when the grain stalk is not lying as shown in FIG. 3 and the lodging mode H where the grain spill is lying. In the standard mode, the synchronizing clutch 38 is turned on and the low speed synchronizing clutch 36 is turned on. Therefore, the constant speed clutch 39 and the high speed synchro clutch 37
Is turned off. In this mode L state, when the hydraulic continuously variable transmission HST is sequentially accelerated, the low speed synchro clutch 36 and the synchro clutch 3 are output from the output shaft 14.
After 8, etc., the cutting output shaft 4 is accelerated with a relatively gentle gradient.

In the laid-down mode H, the high-speed synchro clutch 37 is engaged in the above state. Therefore, the low speed synchronizing clutch 36 is disengaged. The state of the mowing output shaft 4 at this time prompts the moving or scraping of the grain stalks that have fallen due to the rotation transmission being raised steeply.
When the mowing speed rises to a constant speed, the synchro clutch 38 is switched to the constant speed clutch 39, and the transmission from the output shaft 14 through the high speed synchro clutch 36 is stopped by the disengagement of the synchro clutch 38, and at the same time from the input shaft 12. Since the mowing output shaft 4 is transmitted and rotated through the speed clutch 39 and does not pass through the hydraulic continuously variable transmission HST, the mowing speed is kept constant even if the traveling speed is increased. At this time, if the switching timing from the synchro clutch 38 to the constant speed clutch 39 and the switching speed are program controlled by the controller, the cutting speed can be increased at a constant gradient D.

The steering clutch 2, the steering brake 30, and the spin turn clutch 26 in the traveling power transmission device.
These are operated by the output control of the solenoid valve of the hydraulic circuit 58, etc. from the controller CPU having a microcomputer by the left and right turning operation of the power steering lever. As described above, in the combine in which the steering clutch 2 is operated to steer or turn by the speed change transmission by the hydraulic continuously variable transmission HST, when the traveling is stopped, the transmission load remains applied to each traveling transmission gear. In many cases, the auxiliary shift gear cannot be shifted even if an attempt is made to shift the auxiliary shift gear while the vehicle is stopped. For this reason, when traveling is stopped, or when the exhaust sensor in the exhaust device detects that exhaust has run out and the engine is automatically stopped by this, the left and right steering clutches 2 are disengaged. To do. With this, without turning off the special main clutch etc.
With the disengagement control using the steering clutch 2, the gear shift operation can be easily performed, and the configuration and the operation can be simplified.

As shown in FIGS. 4 and 5, the controller CP for controlling the steering operation by the power steering lever or the like is as shown in FIG.
On the input side of U, a power steering position sensor 42 for detecting the left and right operation angles of the power steering lever, a brake pressure sensor 43 for detecting the brake fluid pressure in the left and right steering brakes 30, and a clutch fluid pressure for the left and right spin turn clutch 26 are provided. A spin turn pressure sensor 44 for detecting, a transmission gear rotation sensor 45 for detecting the rotational speed of any gear to detect the transmission rotational speed to the traveling device, a vehicle speed sensor 46 for detecting a vehicle speed, and a spin turn automatically An automatic spin switch 47 for performing the operation, a brake petal switch 49 for the operator to brake the left and right steering brakes 30 by a petal operation, and the like are provided.

On the output side, the steering clutch switching valve 50 in the steering hydraulic circuit for operating the left and right steering clutches 2 and the left and right traveling brakes in the brake hydraulic circuit for operating the left and right steering brakes 30. A pressure reducing valve 51, a left and right spin pressure reducing valve 52 in a spin hydraulic circuit for operating the left and right spin turn clutch 26, and a left and right switching hydraulic circuit for braking the left and right steering brakes 30 by a brake petal operation. It has a brake switching valve 54 and the like.

Depending on the operation angle of the power steering lever, switching control is performed to the neutral range, the pivot turn range, the spin turn range, etc. (FIG. 6). At this time, changes in hydraulic pressure due to the left and right steering clutch switching valves 50, the left and right steering brake pressure reducing valves 51, the left and right spin pressure reducing valves 52, etc. are controlled as shown in the graphs of FIG. In this case, as mentioned above,
When the traveling is stopped, the output control is performed such that the left and right steering clutch switching valves 50 are simultaneously turned off by the detection of the vehicle speed sensor 46.

The left and right steering clutches 2 have a pressure cylinder 55 for operating the clutch, a piston 56 fitted therein, a clutch spring 57 for constantly tensioning the pressure cylinder 55 toward the clutch pressure contact side, and the like. Then
When the hydraulic pressure from the steering clutch hydraulic circuit is sent to the cylinder area between the pressure cylinder 55 and the piston 56, the pressure cylinder 55 is pressed against the clutch spring 57 to disengage the steering clutch 2. To do. On the contrary, when the hydraulic pressure in this cylinder area is released, the pressure cylinder 55 is pushed back by the clutch spring 57 to push the steering clutch 2 into the on state.

Therefore, when the power steering lever is in the neutral region, the left and right steering clutch switching valves 50 are not ON-outputted, so the clutch spring 5
Although the steering clutch is in the state A by 7, the steering clutch is switched to the state B by controlling the ON output of the left and right steering clutch switching valves 50 as described above.

[Brief description of drawings]

FIG. 1 is a front view of a traveling and mowing transmission device section of a combine.

FIG. 2 is a front view of a traveling and reaping transmission device portion of the combine.

FIG. 3 is a graph showing the relationship between running speed and cutting speed.

FIG. 4 is an operation hydraulic circuit diagram.

FIG. 5 is a control block diagram of steering and turning operations.

FIG. 6 is an operation angle of the power steering lever, each steering clutch,
The graph which shows the relationship with hydraulic pressure, such as a steering brake and a spin turn clutch.

[Explanation of symbols]

 1 auxiliary transmission 2 steering clutch 3 traveling transmission case 4 cutting output shaft 5 synchro transmission 6 constant speed transmission 7 synchro transmission case HST hydraulic continuously variable transmission

Claims (1)

[Claims] 1. A traveling transmission case portion 3 having a traveling transmission device internally provided with a traveling transmission device which receives a transmission from a hydraulic continuously variable transmission device HST capable of a main shift and which travels through an internal auxiliary transmission device 1 and a traveling clutch 2. A synchro transmission 5 for driving a reaping output shaft 4 capable of transmitting a reaper by making it possible to perform synchro shift by receiving a transmission from the hydraulic continuously variable transmission HST, and the reaping output without passing through the hydraulic continuously variable transmission HST. A transmission device such as a combine in which a constant speed transmission device 6 for transmitting the shaft 4 at a constant speed is integrally configured with an internal synchro transmission case portion 7.