JPS6216341Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention includes a belt-type continuously variable transmission and a forward/reverse switching mechanism in a traveling transmission system, and a mechanism that controls the operation of the drive mechanism for operating the continuously variable transmission in the increasing/decreasing direction. is provided between a control lever that can be swung in a two-dimensional direction and the forward/reverse switching mechanism, and the forward/reverse switching mechanism is moved into a forward state and a reverse state in conjunction with the one-dimensional operation of the operating lever. A switching mechanism is provided between the operating lever and the control mechanism, and a switching mechanism is provided between the operating lever and the control mechanism for shifting the drive mechanism in conjunction with operations in opposite two-dimensional directions from the forward operating position and the reverse operating position of the operating lever. The present invention relates to a gear shift operating device for a work vehicle that is provided with a mechanism for operating from a neutral state to an increasing speed side.

In this type of speed change operation device, since the operation direction of the control lever from the neutral speed change position to the forward high speed side and the operation direction to the reverse high speed side are opposite, for example, from the forward and reverse operation positions of the control lever, Compared to the case where the drive mechanism is configured to operate from the neutral speed change state to the speed increasing side in conjunction with the operation in the same direction, the operation lever is in either the forward speed change operation area or the reverse speed change operation area. It is easy to intuitively understand whether the gear has been operated, and the desired gear shifting operation can be carried out reliably without looking at the hand.
In configuring an interlocking mechanism between the control lever and the control mechanism to create such a shift operation mode with a good operating feel, conventionally, the control lever is moved from the neutral shift position to the forward high speed side. and an arm that swings the same amount in the direction toward and away from the operating shaft of the control mechanism in conjunction with the operation toward the reverse high-speed side, and swings the operating arm toward and away from the operating shaft by the same amount. Since the operating arm and the operating shaft were linked via a pantograph-type link mechanism that converted the operating force into operating force for operating the operating shaft in the same direction, the number of parts that made up this interlocking mechanism was large, and the mechanism The disadvantage was that the entire structure was large and complex, and the cost was high.

An object of the present invention is to simplify the structure of the movement mechanism for realizing the above-mentioned speed change operation mode with a good operating feel, so that it can be constructed compactly and at low cost.

That is, the speed change operation device for a work vehicle according to the present invention has the following features:
In the above-mentioned device, the interlocking mechanism is configured such that the operation lever is operated from the neutral position to the forward high-speed side and the reverse high-speed side.
The control mechanism is characterized in that an arm that swings the same amount in opposite directions from the operating shaft of the control mechanism is connected, and the arm and the operating shaft are pivotally connected, and the operating lever is connected to the operating shaft. Regardless of whether the gear is operated from the neutral position to the opposite high-speed forward side or high-speed reverse side, the operating shaft can be operated in the same direction by the above-mentioned separation movement of the arm accompanying this operation. Therefore, there is no need to use a special link mechanism for changing the direction of the operating force as in the past, and the mounting posture of the arm connected to the operating lever can be adjusted as described above based on the positional relationship with the operating shaft. By making such a reasonable improvement, we have been able to simplify the structure of the interlocking mechanism, which provides a shift operation mode with a good operating feel as described above, making it compact and inexpensive. .

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

As shown in FIG. 1, the front part of the machine A is equipped with a threshing device 1, an engine 2, and a pair of left and right crawler running devices 3, 3. The reaping section B, which has a device 7 that changes the culm to a sideways posture and conveys and supplies it to the feed chain 6 of the threshing device 1, is connected to the horizontal axis P.
In a combine harvester connected and supported around the periphery so that it can be driven up and down, the engine 2 is connected to the traveling device 3,
The transmission structure to No. 3 is constructed as follows.

That is, as shown in FIGS. 2 and 3, a transmission case 9 is connected to the engine 2 via a transmission belt 10 to a transmission case 9 on which axles 8, 8 for the traveling devices 3, 3 are protruded. An intermediate transmission shaft 12 supporting an input pulley 11 is rotatably mounted via a support member 13, and a multi-disc friction clutch 1 is installed between the intermediate transmission shaft 12 and the input pulley 11.
4, a belt type continuously variable transmission 16 is interposed between the intermediate transmission shaft 12 and the input shaft 15 of the transmission case 9; The transmission system from the transmission gear 15 to the axles 8, 8 includes a mechanism 17 that can be switched to forward or backward movement by shifting the transmission gear 17A, a mechanism 18 that can change the forward speed to three stages by shifting the transmission gear 18A, and a mechanism 18 that can change the forward speed to three stages by shifting the transmission gear 18A. A pair of steering clutches 19, 19 are interposed.

The belt type continuously variable transmission 16 is constructed as follows.

That is, the transmission belt 22 is stretched across the split pulley 20 attached to the intermediate transmission shaft 12 and the split pulley 21 attached to the input shaft 15, and the movable pulley piece 20A of the output side split pulley 20 is fixed. A spring 23 is provided on the side of the pulley piece 20B to bias the movable pulley piece 21A of the input side split pulley 21 to move the split pulleys 20, 21.
By changing the effective diameter of the input shaft 15, the rotational speed of the input shaft 15 can be changed steplessly.

Next, a description will be given of the continuously variable transmission 16 , the forward/reverse switching mechanism 17, and the speed change operating device for the clutch 14.

A single-acting hydraulic cylinder (an example of a drive mechanism) that can slide the movable pulley piece 21A of the input side split pulley 21 via the speed change arm 24 and cam 25 to the deceleration side, that is, in the direction closer to the fixed pulley piece 21B. ) 26, a valve (an example of a control mechanism) 27 that can freely switch between a deceleration state in which pressure oil is supplied to the hydraulic cylinder 26 and a speed increase state in which pressure oil in the hydraulic cylinder 26 is discharged, and the hydraulic cylinder 26. and a mechanism 28 that automatically and reversibly disconnects and operates the clutch 14 when the clutch 14 reaches the maximum deceleration position in conjunction with the operation of the clutch 14, and an operating lever 2 that can be operated to swing in two-dimensional directions.
9 and the forward/reverse switching mechanism 17, a mechanism 30 is provided between the forward/reverse switching mechanism 17 and the forward/reverse switching mechanism 17 in conjunction with operation of the operating lever 29 in one dimension. The operating lever 29 is located between the lever 29 and the valve 27.
The hydraulic cylinder 26 is moved to the maximum deceleration position, that is, the clutch 14
A mechanism 31 is provided for operating the gear from a neutral state in which the gear is turned off to an increasing speed, and furthermore, a mechanism 31 is provided between the hydraulic cylinder 26 and the valve 27 by an amount proportional to the amount of operation of the operating lever 29. When the hydraulic cylinder 26 operates, the operating lever 29
valve 2 while holding it in its shift operation position.
A mechanical feedback mechanism 32 is provided for automatically switching the speed change mode 7 to a neutral state.

The interlocking mechanism 28 between the hydraulic cylinder 26 and the clutch 14 includes a rotary support shaft 33 on the support member 13 that is parallel to the intermediate transmission shaft 12 and the input shaft 15.
An elongated hole 36 supports an arm 34 fixed to one end of the rotating shaft 33 and a rod 35 pivotally connected to the speed change arm 24, and allows the speed change arm 24 to rotate toward the speed increasing side. and a pin 37, and an arm 38 fixed to the other end of the rotation support shaft 33 and the operating arm 14A of the clutch 14 are interlocked and connected via a rod 39.
When the hydraulic cylinder 26 reaches the maximum deceleration position, the pin 37 comes into contact with the portion of the rod 35 corresponding to the end of the elongated hole 36, so that the clutch 14 is cut and operated against the biasing force. It is structured as possible.

An interlocking mechanism 30 between the operating lever 29 and the forward/reverse switching device 17 allows the operating lever 29 to be attached to a rotational shaft 40 that is movable around an axis perpendicular to the rotational axis. An L-shaped link 42 is fixed to an arm 41 that integrally swings vertically when the lever 29 is operated in the one-dimensional direction, and is pivotally connected to the transmission case 9.
A transmission gear 1 of the forward/reverse switching mechanism 17 is provided at one end.
The shift rod 44 of the shift fork 43 is pivotally connected to the L-shaped link 42.
The other end and the arm 41 are pivotally connected via a rod 45.

Thus, to configure the interlocking mechanism 31 between the operating lever 29 and the valve 27, the operating lever 29
An arm 47 is connected to the valve 27 and swings the same amount away from the operation shaft 46 of the valve 27 in the opposite directions as the speed is shifted from the neutral position to the forward high speed side and the reverse high speed side. 47 and the operating arm 48 fixed to the operating shaft 46 are connected to the rod 4.
9 and a rod 5 which is a component of the feedback mechanism 32 and is pivotally connected to the hydraulic cylinder 26.
0 and the operating arm 48 are pivotally connected via a seesaw arm 51 that interlocks and connects them.

Therefore, the operating lever 29 is connected to the rotation support shaft 4.
When the shift gear 17A of the forward/reverse switching mechanism 17 is shifted to the forward operating position or the reverse operating position, the lever 29 is moved from the shifting neutral position N to the above-mentioned When the swinging operation is performed in a two-dimensional direction around the orthogonal axis, the seesaw arm 51 of the feedback mechanism 32 swings upward about the pivot connection point with the rod 50,
The valve 27 is switched from the neutral state to the speed increasing state. When the hydraulic cylinder 26 operates to the shift operation position instructed by the lever 29, the seesaw arm 51 swings around the pivot point with the rod 49 on the lever 29 side as a fulcrum. Only the valve 27 is automatically returned to the neutral state while the shift operating lever 29 is held at its shift operating position.

In the above-described embodiment, a dedicated clutch 14 is provided to bring about the neutral shift state, but the belt-type continuously variable transmission 16 having a clutch function may also be used.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the speed change operation device for a work vehicle according to the present invention, in which Fig. 1 is an overall side view of the combine, Fig. 2 is an enlarged cross-sectional view of the main parts, and Fig. 3 is a part of the main parts. It is a notch side view. 16 ... Belt type continuously variable transmission, 17... Forward/forward switching mechanism, 26... Operating drive mechanism, 27...
control mechanism, 29... operating lever, 30 ... interlocking mechanism, 31 ... interlocking mechanism, 32 ... mechanical feedback mechanism, 46... operating shaft, 47... arm.

Claims (1)

[Claims for Utility Model Registration] A belt-type continuously variable transmission 16 and a forward/reverse switching mechanism 17 are interposed in the traveling transmission system, and among these, a driving mechanism 26 for operating the continuously variable transmission 16 is controlled to increase or decrease. In addition to providing a mechanism 27,
A control lever 29 that can be swung in two dimensions and the forward/reverse switching mechanism 17 is provided between the forward/reverse switching mechanism 17 and the forward/reverse switching mechanism 17 in conjunction with the one-dimensional operation of the operating lever 29. A switching mechanism 30 is provided, and the operating lever 29
and the control mechanism 27, the drive mechanism 26 is moved from the neutral speed change state to the speed increasing side in conjunction with the operation of the control lever 29 in opposite two-dimensional directions from the forward operation position and the reverse operation position. In a speed change operation device for a work vehicle that is provided with a mechanism 31 for operating, the interlocking mechanism 31 is configured by:
The operating lever 29 is connected to an arm 47 that swings away from the operating shaft 46 of the control mechanism 27 by the same amount in opposite directions as the operating lever 29 is operated from the neutral position to the forward high-speed side and the reverse high-speed side. A speed change operating device for a work vehicle, characterized in that the arm 47 and the operating shaft 46 are pivotally connected. The drive mechanism 26 and the control mechanism 27 are mechanical feedback mechanisms that automatically switch the control mechanism 27 to a non-operational state when the drive mechanism 26 operates by an amount proportional to the amount of swing operation of the operating lever 29. 32. A speed change operating device for a working vehicle as set forth in claim 1, which is linked to the vehicle via a reference numeral 32.