JPS6218773Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a pair of belt tension clutches with different transmission ratios across the drive side output shaft and the traveling device side input shaft, and both belt tension clutches are individually operated to disconnect. The present invention relates to a belt tension clutch type transmission device for agricultural machinery, which is provided with one shift operation lever for switching between a shift state and an alternatively engaged state.

In the conventional transmission described above, the guide groove is configured in a U-shape, and the lever is operated from a neutral position regardless of whether the tension clutch is engaged or engaged. As a result, there were shortcomings such as a lack of stability, such as accidental high-speed operation when starting, and sudden starts. In addition, when performing high/low gear shifting operations, the shifting operation must always be performed using the path for the neutral position, and the operation path is long, and furthermore, the operation to the neutral position and the operation to enter from the neutral position are mutually exclusive. Since it reverses in the completely opposite direction, it has the disadvantage that it is difficult to perform quick operations, such as pushing and pulling by bending and stretching your arms. In particular, when starting from a high-speed drive, it takes time to operate the vehicle when it first changes to a low speed and then changes to a high speed, and since the operation must be performed after the neutral position, instantaneous switching cannot be performed, resulting in poor starting performance. It was hot.

In view of the above-mentioned circumstances, the present invention makes it possible to reliably avoid erroneous operations when starting, and also to enable speed change operations between high and low speeds to be performed quickly in a short path.
The purpose is to enable good starting performance when driving at high speed.

In order to achieve the above object, the present invention provides a pair of belt tension clutches having different transmission ratios across the driving side output shaft and the traveling device side input shaft, and also provides a pair of belt tension clutches with different transmission ratios.
In a belt tension clutch type transmission for agricultural machinery, which is equipped with a single gear shift control lever for switching between a state in which the gears are operated individually and a state in which the gears are selectively engaged, the gear can be freely oscillated around a single support shaft. It comprises an operating lever and a pair of locking pieces that are individually linked to each of the belt tension clutches on the low and high speed sides and that are engageable with the gear shift operating lever, and are arranged in the middle of the entire swing range of the gear shift operating lever. A point is formed at the operating point of the belt tension clutch on the low speed side and a neutral operating point of the belt tension clutch on the high speed side, and one end of the entire swing range is formed at the neutral operating point of the belt tension clutch on the low speed side and the neutral operating point of the high speed side belt tension clutch. The locking piece is formed at the operating point of the tension clutch and the other end is formed at the neutral operating point of the low speed side belt tension clutch, and the locking piece linked to the low speed side belt tension clutch is used to lock the high speed side belt tension clutch. It is characterized in that it is configured to follow the swinging movement of the gear shift operating lever in both operating ranges.

Next, embodiments of the present invention will be described based on the drawings.

A threshing device 3 is mounted on a machine body 2 equipped with a crawler-type traveling device 1, and a reaping conveyance section 4 and a control section 5 are arranged side by side in the left-right direction of the machine body at the front of the threshing device 3. A combine harvester is constructed in which a waste straw processing device 6 is attached to the culm, and the planted grain culms are harvested and threshed.

As shown in FIG. 2, a pair of transmission belts 9 and 10 are wound around an input shaft 7 to the traveling device 1 and an output shaft 8 from the engine with different transmission ratios, and High-speed side and low-speed side tension pulleys 12 and 1 are applied to the belts 9 and 10, respectively, with the belts 9 and 10 being biased toward the cutting side via springs 11.
3 is attached, and both tension pulleys 12,
A pair of belt tension clutches A, 13 are linked with a manual gear shift operation lever 15 provided in front of the driver's seat 14 in the control section 5, and a two-speed shift state of high and low gears and a running stop state are obtained.
A transmission device is constructed by B.

The operating lever 15 is connected to brackets 16, 16.
It is rotatably attached to a support shaft 17 that is horizontally suspended in the left-right direction of the aircraft, and is displaceable over a predetermined range in the axial direction of the support shaft 17. Boss members 19 and 20 are provided on both sides of the lever 15, and this boss member 1
9, 20 and the support arms 30, 30 of the tension pulleys 12, 13 are connected to the release wire 1.
8 and 18 inner wires 18a are used to interlock each other.

As shown in FIG. 3, the boss member 20 linked to the low-speed side tension pulley 13 has its wire connection point a located near the line connecting the outer wire receiver 18A and the axis of the support shaft 17. Low speed position L when the low speed side tension clutch A is engaged
It is operated to two cutting positions, that is, neutral positions N ₁ and N ₂ that are displaced up and down relative to this, and the neutral positions N ₁ and N ₂ are operated by the stopper 23,
23 and the biasing force of the spring 11, it is stably maintained.

The boss member 19 linked to the other high-speed side tension pulley 12 is connected to the high-speed side tension clutch B.
It is operated to a neutral position N in the off state and a high speed position H in the on state, and the stopper 23,
23 and the biasing force of the spring 11.
Positions N and H are maintained stably.

Then, the one boss member 20 is at the low speed position L.
, and the other boss member 19 is at the neutral position N.
In the state shown in FIG. It is arranged so that it can be selectively engaged with the pieces 21, 21.

Further, a locking pin 24 is provided in series with the boss member 19, and the wire connecting point a of the boss member 20 is placed in a first neutral position.
The boss member 19 in the neutral position N when switching from N ₁ to the low speed position L that slightly exceeds the above line.
A locking member 25 is provided to externally lock the pin 24, and the engagement of the pin 24 and the engaging member 25 causes the lever 15 to be selectively engaged with the engaging piece 21 of the high-speed side boss member 19. Even when the high speed side tension clutch A is engaged, the low speed side tension clutch A can be maintained in the engaged state. The connecting point a of one low-speed side boss member 20 is reversibly moved to the second neutral position.
It is now possible to switch to _N2 .

In order to operate both tension clutches A and B in this way, a guide groove 22 is provided to guide the linear one-dimensional rocking of the lever 15. Locking piece 2
1 and 21, and operating paths D and F in the longitudinal direction of the aircraft, which are formed in front and rearward directions, are provided. Boss members 19, 2 at the end
0, that is, neutral positions N, N ₁ , _{N 2} , low speed position L, and high speed position H are shown. By the first operation of swinging to the front low speed position L, the low speed tension clutch A can be engaged, and then the lever 15 can be engaged.
By the second operation of positioning the machine to the neutral position N in the left-right direction of the aircraft along the path E, the high-speed tension clutch B, which is in the neutral position, is operated while maintaining the engaged state of the low-speed tension clutch A. The lever 15 can be engaged with the system, and the low speed side tension clutch A can be disengaged by a subsequent third operation of swinging the lever 15 along the path F to the high speed position H on the forward side of the fuselage. At the same time as the operation, the high-speed side tension clutch B can be engaged and operated.

The outer wire receiver 18B on the tension pulley side is received by a swing arm 27, and the swing arm 27 and foot pedal 28 are connected to a rod 29.
When the pedal 28 is depressed, the lever 15 is operated to disconnect the tension clutch A or B, which is in the engaged state, regardless of whether the vehicle is running at high speed or low speed. It is configured to be able to stop running.

FIG. 4 shows another embodiment, in which a third boss member 26 is rotatably supported on the side of the low-speed side boss member 20 around a support shaft 36, and as shown in FIG. The operating arm 31 of the tension-type reaping clutch C and the third boss member 26 are interlocked and connected by an inner wire 32 of the release wire, and are wrapped around a locking piece 21 connected to the low-speed side boss member 20. In the state where the third locking piece 3 is
3 is connected to the third boss member 26, and the reaping clutch C is connected to the third boss member 26 in response to the first operation of the lever 15 to move the low speed side boss member 20 to the low speed position L.
The third boss member 26 is stably maintained in the engaged position X and the cut position Y by the urging force of the stopper 34 and the spring 35. Moreover, when the lever 15 is switched to the neutral position N by the second operation, the engagement of the lever 15 with the third engagement piece 33 is released, so that the reaping clutch C The reaping clutch C can be operated at high speed while being in the engaged state, and the reaping clutch C can be engaged and operated automatically and reversibly in conjunction with the traveling operation using the single speed change operation lever 15.

In FIG. 4, the same reference numerals are given to the same constituent members as those in the structure of the embodiment, and the explanation thereof is omitted.

6 and 7 show a second alternative embodiment, in which the locking piece 21 for the boss member 19 on the high-speed side is fixed when the boss member 19 is in the neutral position N.
The lever 15 is provided to engage when the low-speed side tension clutch A is switched to the low-speed position L, and the locking piece 21 has a locking piece 21 that allows the lever 15 to come out of the engaging portion when the lever 15 is swung. A state switching mechanism 37 is provided that switches between a state O that allows and a state S that prevents the transmission, and by linear operation of the lever 15 in one dimension, the transmission using both belt tension clutches A and B is It is designed to be sequentially switched to a neutral position N ₁ , a low speed position L, and a high speed position H.

The state switching mechanism 37 includes a pin 38 on the locking piece 21 that is slidable between a locking action position that prevents the lever 15 from coming off the engagement portion and a non-action position that allows the lever 15 to come off. Further, a cam follower 40 is connected to the pin 38, and a positioning stopper 41 _is provided. Then, the wire connection point b of the boss member 19 moves from slightly before the line ₁ to the high speed position H.
In the first range Q ₁ leading to , the pin 38 is switched to the slip-out prevention state S. In other words, in the range Q ₂ where the pin 38 is out of the first range Q ₁ from the entire operating range Q of the wire connection point b, the pin 38 is A fixed cam 42 is provided in such a manner that it acts on the cam follower 40 and switches the fixed cam 38 to the allowable state O.

As shown in FIG. 8, the operating lever 15 is provided with a member 43 that engages and disengages from the locking piece 21 by manual operation, and the engagement and disengagement member 43 is swingable relative to its connecting member 44. In addition, a spring 45 is provided which urges the slip-out prevention state S, so that the slip-out prevention state S is automatically switched to the slip-out prevention state S when the high-speed side clutch B is engaged, and the slip-out permission state O is changed by manual operation. The clutch switching structure by linear operation of the lever 15 can be modified in various ways, and the gear change operation may also be performed by operating the lever 15 in the left and right directions, and the one-dimensional operation direction is not limited.

Furthermore, the belt tension clutch type transmission according to the present invention can of course be used in various agricultural machines such as tillers.

As explained above, according to the present invention, when the high-speed side tension clutch is engaged, the low-speed side tension clutch is first engaged.
It was possible to reliably avoid engaging the high-speed side tension clutch when starting the vehicle, thereby improving safety by avoiding sudden starts.

Moreover, when performing high-low gear shifts, extremely quick high-low gear shifts can be achieved by simply operating the operating lever linearly in one dimension without operating the operating lever to the neutral position.

In particular, when starting at high speed, as mentioned above, once the low-speed side tension clutch is engaged to obtain a low-speed running condition, the high-speed side tension pulley can be engaged in a short path from there.
Compared to the conventional configuration in which the clutch is always disengaged when switching between high and low speed driving conditions, it is now possible to shift gears sequentially under continuous clutch operation, allowing the vehicle to gradually increase speed and start smoothly. while doing,
It was possible to obtain high-speed driving conditions well and quickly.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an overall side view of the combine harvester, Fig. 2 is a mechanism diagram showing the speed change operation system, Fig. 3 is an explanatory diagram of the operation, and A shows the state in which the combine harvester is stopped. , B indicates a low-speed running state, and C indicates a high-speed running state. FIG. 4 is a mechanism diagram of the first alternative embodiment, FIGS. Figure 7 is a schematic diagram of the unfolding mechanism. FIG. 8 is a side view of a third alternative embodiment. 7... Traveling device side input shaft, 8... Drive side output shaft, 15... Speed change operation lever, 17... Support shaft, 2
1...Locking piece, A...Low speed side belt tension clutch, B...High speed side belt tension clutch, N, _N1 , _N2 ...Neutral position, L...Low speed position, H...High speed position .

Claims (1)

[Scope of utility model registration request] A pair of belt tension clutches having different transmission ratios are provided across the driving side output shaft and the traveling device side input shaft, and both the belt tension clutches are operated in a state where they are respectively disengaged and a state where they are selectively engaged. This is a belt tension clutch type transmission for agricultural machinery that is equipped with a single gear shift control lever for switching between low and high speeds. a pair of locking pieces that are individually linked to the transmission clutch and can be engaged with the speed change operation lever;
The midpoint of the entire swing range of the speed change operating lever is formed as the operating point of the low speed side belt tension clutch and the neutral operating point of the high speed side belt tension clutch, and one end of the full swing range is formed as the low speed side belt tension clutch's neutral operating point. The locking piece is formed at the neutral operating point of the tension clutch, the operating point of the high-speed belt tension clutch, and the other end is formed at the neutral operating point of the low-speed belt tension clutch, and is linked to the low-speed belt tension clutch. A belt tension clutch type transmission device for agricultural machinery, characterized in that the belt tension clutch type transmission device for agricultural machinery is configured to follow the rocking of a speed change operation lever in the operating range of a locking piece of a high speed side belt tension clutch.