JPS62165048A - Device for speed change operation for working vehicle - Google Patents

Abstract

PURPOSE:To prevent advancing or reversing which is not necessary and use the captioned vehicle safely by providing a means of forcedly stopping the traveling of body during the time from the output of a speed change indicating information for shifting between advancing and reversing to the completion of the speed change. CONSTITUTION:A movable clutch member 13A which can be engaged with or removed from the inner peripheral part of an input gear 26, has a gear which can be always meshed with a gear 14A provided on an axle 14. The movable clutch member 13A is fitted on a spline slidably on a steering clutch shaft 12 and, the connection or disconnection of power transmission is carried out by the sliding operation of the movable clutch member 13A. A multiple disk steering brake 21 is provided in between the movable clutch member 13A and a transmission case 1, and braking action is effected by the pressing force of the movable clutch member 13A. A shift fork 48 for the movable clutch member 13A is operated by a separately provided hydraulic cylinder. When a speed change indication means is operated and only when the speed change is for reversing while when the present advancing gear is the second or third gear, a hydraulic cylinder is operated until the elapsed time exceeds a preset time, to render the steering brake 21 in a braking condition.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a control valve for selectively engaging and operating a hydraulically operated forward clutch and a hydraulically operated reverse clutch, and The present invention relates to a speed change operation device for a working vehicle, which is provided with a valve operation control means for automatically operating the control valve based on instruction information of the means, and is provided with a travel clutch for stopping drive travel.

[Conventional technology]

In such a speed change operating device, when switching to a forward or reverse state, it is necessary to continue to disengage the travel clutch for an appropriate period of time.

In other words, switching to the forward or reverse state is achieved by operating the control valve, disengaging the forward clutch or reverse clutch that is in the engaged state, and then turning off the reverse or forward clutch that was in the disengaged state. This is done by shifting the gear, but it takes a certain amount of time to complete the shift. For this reason, if the disengaged drive clutch is engaged before the forward/reverse shift is completed, the vehicle body will move forward with the output of the forward clutch even though it is intended to switch to reverse, or the vehicle will not move forward. Even though the clutch is switched, there is a risk that the vehicle will move backwards, so it is necessary to continue disengaging and operating the travel clutch as described above.

By the way, the reason why it takes time to complete a shift is that it takes time to switch the control valve to multiple control states corresponding to each shift state, and even if the control valve is not in the desired control state. Even if the clutch is operated, it takes time to supply and discharge pressure oil to each clutch (not mentioned in the literature).

[Problem that the invention seeks to solve]

However, when switching to forward or reverse, unskilled persons may neglect to continue disengaging the travel clutch until the gear shift is completed, resulting in unnecessary forward or reverse movement. There was a risk of it happening.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent unnecessary forward movement even if the travel latch is not continuously turned off when switching to the forward or reverse state. Alternatively, the point is to prevent backward movement.

[Means for solving problems]

The characteristic configuration of the shift operation device for a work vehicle according to the present invention is that a forced stop means is provided for forcibly stopping the movement of the vehicle body from when the shift instruction information for forward/reverse switching is output from the shift instruction means until the shift is completed. Its functions and effects are as follows.

[For production]

In other words, the running of the vehicle is forcibly stopped from the time when the shift instruction information for forward/reverse switching is output from the shift instruction means until the shift is completed, and the travel clutch is engaged and operated before the shift is completed. Even if this happens, the vehicle will continue to stop.

〔Effect of the invention〕

Therefore, even if the drive clutch is engaged and operated before the gear shift is completed when switching to the forward or reverse state, it is possible to avoid unnecessary forward or reverse movement of the vehicle body. 'v! Even first-time practitioners can now use it safely.

〔Example〕

Hereinafter, a case where an embodiment of the present invention is applied to a combine harvester as an example of a work vehicle will be described.

As shown in Fig. 6, the engine (2), which is interlocked and connected to the threshing device (3) via a transmission belt, is connected to the input shaft (5) of the transmission case (1) for driving and stopping the drive. They are interlocked and connected via a rotary tension type traveling clutch (4), and a pulley (8) for transmission to the reaping section (9) is attached to the input shaft (5).

The input shaft (5) is provided with an output gear (6) of a pump drive system, and is transmission connected to a drive shaft (22) of a hydraulic pump (18) via a relay shaft (7). The input shaft (5)
Taranochigya (15), which has three large and small gear parts.
The first intermediate shaft (10) is fitted with a spline so that it can be shifted and moved, and the first intermediate shaft (10) is installed parallel to the input shaft (5).
A two-stage gear (24) having two gear parts is fixed to the thalasso gear (15) and two large and small independent gears (23).
, (23) and the small gear portion of the two-stage gear (24) constitutes a sub-transmission device (H) that can be switched to three stages.

Below the first intermediate axis (lO), there are two parallel
An intermediate shaft (16) and a third intermediate shaft (17) are constructed, and a second
The intermediate shaft (16) is equipped with a hydraulically operated first forward speed clutch (
20a) and a hydraulically operated three-speed forward clutch (20c)
), a hydraulically operated reverse clutch (20d) and a hydraulically operated two-speed forward hydraulic clutch (20b) are respectively attached to the third intermediate shaft (17), and the hydraulic pump (17)
Each clutch (20a)
By selectively entering and operating ..., three forward speeds,
It consists of a main transmission device that can freely change gears to one reverse gear.

The second intermediate shaft (16) and the third intermediate shaft (17) are provided with output gears (25) and (25), respectively, and an input gear (26) supported on the steering clutch shaft (12) is provided with output gears (25) and (25), respectively. ,
The output gears (25) and (25) are always engaged with each other. A pair of steering clutches (13), (13) are provided that separately connect and disconnect the input gear (26) and the pair of left and right axles (14), (14), and each steering clutch (13) , (13) A pair of steering brakes (21L (21)) are provided which become in a braking state by an operation subsequent to the turning operation (13).

To explain the steering clutch (13) and the steering brake (21), they can be freely engaged with and disengaged from the inner circumference of the human gear (26), and the gear (21) attached to the axle (14) A movable clutch piece (13^) equipped with a gear that can be freely engaged with the steering clutch shaft (12) is slidably spline-fitted to the steering clutch shaft (12) to form a movable clutch piece (13A).
The structure is such that power transmission can be interrupted or interrupted by a sliding operation. Further, a multi-plate steering brake (21) is provided between the movable clutch piece (13A) and the transmission case (1) side.
is provided so that the steering brake (21) can be operated into a braking state by pressing with the movable clutch piece (13A).

In addition, (46) in the figure is a pair of steering brakes (21).

(21) is a brake lever that switches one of them to a braking state when parking, etc., and (47) in the figure
is a spring that biases the movable clutch piece (13^) toward the clutch input side. Furthermore, (48) in the figure is a shift fork for the movable clutch piece (13A), and a hydraulic cylinder (48) that operates the shift fork (48).
9) (see Figure 1) is provided outside the mission case (1).

The valve operation control means (1()) that automatically operates the control valve (19) based on the instruction information section of the shift instruction means (W) using a push button switch will be described below.

As shown in Figures 3 to 5, the mission case (1
) A fuselage frame (27) is provided along the upper surface, and a drive motor (28) is attached to this fuselage frame (27).
) A base frame (29) for mounting is installed upright. A drive motor (28) is mounted horizontally on this base frame (29), and the output shaft (
The actuating arm (30) is fixed to 288).

The linkage mechanism (34) between the drive motor (28) and the control valve (19) will be explained below.
A horizontal support shaft (31) is provided on the back side of the horizontal support shaft (27).
A sleeve (32) is rotatably fitted onto the sleeve (31).

and a connecting arm (35) with one end fixed to the sleeve (32), and an operating shaft (19A) of the control valve (19).
a second connecting arm (37) that interlocks and connects the first working arm (36) fixed to the first connecting arm (35);
and a sector-shaped interlocking arm (38) fixed to the sleeve (32).

The fan-shaped interlocking arm (38) is provided with an engagement groove (40) forming a detent mechanism (39) at its outer peripheral edge. This detent mechanism (39) has an arm (41
) and a spring (42) that biases the arm (41) in the engagement direction.

The interlocking arm (38) is provided with an elongated hole (38A) facing the axis of the horizontal support shaft (31) as the center of swing, and is fixed to the output shaft (28A) of the drive motor (28). A pin (30A) is erected on the actuating arm (30), and this pin (30A) is slidably engaged in the elongate (38A). Therefore, the interlocking arm (38) is swung by the rotational operation of the drive motor (28), and the control valve (
19) will be rotated.

As shown in Fig. 1, the gear change instruction means (匈) comprises a forward three-speed switch (S3), a forward two-speed switch (S2), a forward first-speed switch (S), and a neutral switch. A switch (Sn) and a reverse switch (Sr) are provided.

Each of the switches (S3) to (Sr) is connected to a control device (C) using a microcomputer, and when any of the switches (si) to (Sr) is operated, each switch (S3) 1J11 electric control switch (Tn) using a transistor corresponding to each of (Sr),
(Tz), (T+), (Tn), and (Tr) are configured to be operated by the control bag U(C), and along with the operation of the energization control switches (Tn) to (Tr),
The motor (2) uses the low-reswitch mechanism (R5).
8) Forward rotation relay (La) or reverse rotation relay (L)
b), the motor (28) is rotated to five predetermined rotational positions, and the operating arm (30) is rotated to the forward 3rd speed position (F3), the forward 2nd speed position (F2), and the forward position. L speed position (F,), neutral position (N), and reverse position 1
It is without F14 so that it can be operated on J (fl).

To explain the switch mechanism (17s), a pair of relay-side fixed contacts (Da) are connected to each of the forward rotation relay (La) and the reverse rotation relay (Lb), respectively.
(Db), and switch-side fixed contacts (lE3), (Ez), (El), (En), which are individually connected to each of the energization control switches (T3) to (Tr), respectively.
(Er) is formed into an arc shape, and the operating shaft (2
8A), and the operating shaft (28A).
) is attached to rotate integrally with the switch operating member (4).
5), a forward rotation movable contact (Ka) and a reverse rotation movable contact (Kb) are respectively attached.

The control device (C) controls a forced stop means (Z) for forcibly stopping vehicle running from when the shift instruction information ￥U for forward/reverse switching is output from the shift instruction means (W) until the shift is completed. , both steering clutches (13) , (13)
, and both steering brakes"F (21).

(21), and will be described in detail below.

However, when switching from reverse to forward, and when switching from 1st forward speed to reverse, the motor (28
), the time required to operate the control valve (19) is very short, so there is a low probability that the travel clutch (4) will be engaged and operated before the gear shift is completed. The vehicle is forced to stop only when switching from 3rd forward speed or 2nd forward speed to reverse.

That is, the pair of shift forks (48).

Hydraulic cylinders (49) and (48) are operated separately.
49) Control valves (50) and (50) for the husband,
It is provided so as to be operated by a command from a control device (C).

As shown in the flowchart of FIG. 2, each switch (S:I) of the shift instruction means (W).

It is checked whether or not (Sz), (S+), (Sn), and (Sr) have been operated, and if they have been operated, it is a shift to reverse mode and the current forward mode is 3rd gear. Or, only if it is in 2nd gear, the elapsed time (
The hydraulic cylinders (49) and (49) are operated to disengage and operate the left and right steering clutches (13) and (13) until T) reaches a preset time (1+) or more, and the left and right steering clutches (13) and (13) are disengaged. The brakes (21) and (21) will continue to be operated in a controlled state.

[Another example]

In addition to being applied to the speed change of combine harvesters, the present invention can also be applied to tractors,
It can be applied to shifting the speed of various work vehicles such as transport vehicles.

Furthermore, the present invention is suitable for shifting reverse gears to multiple gears and
This can also be applied to the case of changing gears, and the point is that it is possible to suppress traveling backwards when changing gears to forward speed, or driving forwards when changing gears to backwards. good.

[Brief explanation of drawings]

The drawings show an embodiment of the gear shift operating device for a work vehicle according to the present invention, FIG. 1 is a schematic diagram showing the overall configuration of the gear shifting operating device, FIG. 2 is a flowchart showing the control operation, and FIG. 3 is a diagram showing the motor and control. FIG. 4 is a side view showing the linkage structure with the valve, FIG. 4 is a schematic diagram thereof, FIG. 5 is a front view showing the motor mounting part, and FIG. 6 is a front view showing the transmission structure. (4)...Travel clutch, (19)...
・Control valve, (20a), (20b), (20c
) -”・Forward clutch, (20d)・・・Reverse clutch, (II)・・・Valve operation control means,
(Oath)... Gear change instruction means, (Z)...
Forced stop means.

Claims (1)

[Claims] Hydraulically operated forward clutches (20a), (20b),
(20c) and hydraulically operated reverse clutch (20d)
A control valve (19) is provided for selectively entering and operating the
A working vehicle is provided with a valve operation control means (H) for automatically operating the control valve (19) based on instruction information from a speed change instruction means (W), and a travel clutch (4) for stopping drive travel. The gear shift operation device is provided with a forced stop means (Z) for forcibly stopping the running of the vehicle from when the gear shift instruction means (W) outputs gear shift instruction information for forward/reverse switching until the gear shift is completed. A gear shift control device for a work vehicle.