JPH0784903B2 - Work vehicle gear shift operation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is provided with a control valve for selectively turning on and operating a hydraulically operated forward clutch and a hydraulically operated reverse clutch, and a shift instruction means. The invention relates to a shift operating device for a work vehicle, which is provided with a valve operating control means for automatically operating the control valve based on the instruction information of 1. and a traveling clutch for stopping driving traveling.

[Conventional technology]

In such a shift operating device, it is necessary to continue to operate the traveling clutch for an appropriate period of time when switching between the forward drive state and the reverse drive state.

That is, switching to the forward drive state or the reverse drive state is performed by operating the control valve to disengage the forward drive clutch or the reverse drive clutch in the engaged state while operating the reverse drive clutch or the forward drive clutch in the disengaged state. Although it is performed by performing the input operation, it takes a predetermined time to complete the shift. Therefore, if the disengaged traveling clutch is engaged before the shift for forward / reverse switching is completed, the vehicle body will move forward with the output of the forward clutch or will move forward even though it is switched to reverse. Despite the switching, there is a risk of causing the vehicle body to move backward, so it is necessary to continue disengaging the traveling clutch as described above.

Incidentally, the reason why it takes time to complete the shift is that it takes time to switch the control valve to a plurality of control states corresponding to each shift state, or even if the control valve is operated to a desired control state. However, it can be mentioned that it takes time to supply and discharge the pressure oil to and from each clutch. (Not described in the literature).

[Problems to be solved by the invention]

However, an unskilled person may neglect to continue disengaging the traveling clutch until the shift is completed when switching to the forward drive state or the reverse drive state, resulting in unnecessary forward or reverse drive. There was a risk of being lost.

The present invention has been made in view of the above circumstances, and an object thereof is to perform an unnecessary forward movement even when the traveling clutch is not continuously disengaged when switching to a forward movement state or a reverse movement state. Or there is a point to prevent the reverse movement.

[Means for solving problems]

The characteristic configuration of the shift operating device for a work vehicle according to the present invention is the one described in the introduction, in which the vehicle body is forced to run from the time the shift instruction means outputs the shift instruction information for forward-reverse switching until the shift is completed. The point is that the forced stop means having the time setting means for setting the forced stop time in advance to allow for the shift completion time is provided so as to stop, and the action and effect thereof are as follows.

[Work]

That is, the vehicle body traveling is forcibly stopped from the time when the shift instruction information is output from the shift instruction means until the shift is completed, and the traveling clutch is operated before the shift is completed. Even if something happens, the car body will continue to stop.

〔The invention's effect〕

Therefore, when the traveling clutch is switched to the forward traveling state or the reverse traveling state, even if the traveling clutch is operated before the shift is completed, it is possible to prevent the vehicle body from unnecessarily traveling forward or backward. Experts can now use it safely.

〔Example〕

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

As shown in FIG. 6, the engine (2) interlockingly connected to the threshing device (3) via a transmission belt is connected to the input shaft (5) of the traveling mission case (1) by a belt for stopping driving and traveling. The tension type traveling clutch (4) is interlockingly connected, and the input shaft (5) is provided with a transmission pulley (8) to the reaper (9).

The input shaft (5) is provided with an output gear (6) of a pump drive system, and is transmission-coupled to the drive shaft (22) of the hydraulic pump (18) via a relay shaft (7). In the input shaft (5),
A clutch gear (15) having three large and small gears is fitted onto the spline so as to be shift-movable, and the large and small 2 are attached to the first intermediate shaft (10) installed in parallel with the output shaft (5).
The single gear (23), (23) and the two-stage gear (24) having two large and small gears are fixed to each other, and the clutch gear (15)
And two large and small independent gears (23), (23) and two-stage gear (2
An auxiliary transmission (11) that can be switched in three stages is configured by an alternative engagement with the small gear section in 4).

Two second intermediate shafts (16) and a third intermediate shaft (17) are installed in parallel below the first intermediate shaft (10), and a hydraulically operated forward movement is provided on the second intermediate shaft (16). 1st speed clutch (20a) and hydraulically operated forward 3rd speed clutch (20c), 3rd intermediate shaft (17) hydraulically operated reverse clutch (20d) and hydraulically operated 2nd forward hydraulic Each clutch (20a) is selectively engaged by switching control of a rotary type control valve (19) (see FIG. 3) which is equipped with a respective clutch (20b) and is communicatively connected to the hydraulic pump (18). The main transmission is configured so that it can be operated in three forward speeds and one reverse speed by operating.

Each of the second intermediate shaft (16) and the third intermediate shaft (17),
Output gears (25) and (25) are provided, and an input gear (26) supported on the steering clutch shaft (12) is constantly meshed with both the output gears (25) and (25). A pair of steering clutches (13) and (13) are provided for intermittently connecting and disconnecting the input gear (26) and the pair of left and right axles (14) and (14), respectively, and the operating clutches (13) and (13), A pair of steering brakes (21) and (21) are provided which are brought into a braking action state by an operation subsequent to the turning operation of (13).

The steering clutch (13) and the steering brake (21) will be described. A gear (26) that is detachable from the inner peripheral portion of the input gear (26) and is attached to the axle (14). 14
A) A movable clutch piece (13) with a gear that can be always engaged
The steering clutch shaft (12) is slidably fitted to the steering clutch shaft (12), and the power transmission is interrupted by the sliding operation of the movable clutch piece (13A). Further, a multi-plate type steering brake (21) is provided between the movable clutch piece (13A) and the mission case (1) side, and the operating brake (21) is in a braking action state by pressing by the movable clutch piece (13A). It is configured so that it can be operated.

In the figure, (46) is a pair of steering brakes (21), (21).
One of them is a brake lever that switches to a braking action state during parking or the like, and (47) in the figure is a spring that biases the movable clutch piece (13A) toward the clutch entry side. Further, in the figure (48), the movable clutch piece (13
A hydraulic fork (49), which is a shift fork for (A) and operates the shift fork (48) (see FIG. 1).
Is provided outside the mission case (1).

The valve operation control means (H) for automatically operating the control valve (19) based on the instruction information of the shift instruction means (W) using the push button switch will be described below.

As shown in FIGS. 3 to 5, the machine body frame (27) is provided along the upper surface of the mission case (1), and the drive motor (28) is provided on the machine body frame (27).
A base frame (29) for mounting is erected. Drive motor (28) sideways to this base frame (29)
Is attached, and the operation arm (30) is fixed to the output shaft (28A) of the drive motor (28).

Explaining the linkage mechanism (34) of the drive motor (28) and the control valve (19), a horizontal support shaft (31) is provided on the back side of the machine frame (27), and the horizontal support shaft (31) is provided. A sleeve (32) is rotatably fitted over the sleeve. The connecting arm (35) having one end fixed to the sleeve (32), the swing arm (36) fixed to the operation shaft (19A) of the control valve (19), and the first connecting arm (35). A second connecting arm (37) for interlocking connection and a fan-shaped interlocking arm (38) fixed to the sleeve (32) are provided.

The fan-shaped interlocking arm (38) is provided with an engagement groove (40) forming a detent mechanism (39) at the outer peripheral edge portion. The detent mechanism (39) includes an arm (41) having an engaging portion (41A) that can be engaged with and disengaged from the engaging groove (40), and a spring (for biasing the arm (41) in an engaging direction. 42) and.

The interlocking arm (38) is provided with an elongated hole (38A) facing the axis of the horizontal support shaft (31) as a swing center, and
A pin (30A) is erected on an operating arm (30) fixed to the output shaft (28A) of the drive motor (28).
0A) is slidably engaged in the slot ((38A)).
Therefore, the interlocking arm (38) is swung by the rotation operation of the drive motor (28), and the first and second connecting arms (35), (3
The operation shaft (19A) of the control valve (19) is rotated via 7).

As shown in Figure 1, to constitute the shift instruction means (W), the forward third speed switch (S _3), switching the second forward speed (S _2), the switch for forward first speed (S ₁₎ , A neutral switch (Sn) and a reverse switch (Sr) are provided respectively.

When the switches (S ₃ ) to (Sr) are connected to a control device (C) using a microcomputer and any of the switches (S ₃ ) to (Sr) is operated, the switches (S ₃ ) to (Sr) S ₃₎ to (energization control switch transistor utilization corresponding to each of the _{Sr) (T 3), (} T 2), (T 1), (T
n) and (Tr) are configured to be turned on and off by the control device (C), and the rotary switch mechanism (RS) is used along with the operation of the energization control switches (T ₃ ) to (Tr). By energizing the forward rotation relay (La) or the reverse rotation relay (Lb) of the motor (28), the motor (28) is rotated to the predetermined five rotation positions, and the operating arm (30) is moved forward 3 Speed position (F ₃ ), forward 2 speed position (F ₂ ), forward 1
It is configured to operate in the speed position (F ₁ ), the neutral position (N), and the reverse position (R).

Explaining the switch mechanism (RS), a pair of relay-side fixed contacts (Da), (Db), which are separately connected to the forward rotation relay (La) and the reverse rotation relay (Lb), respectively, and
Switch-side fixed contacts (E ₃ ), (E ₂ ), which are separately connected to the energization control switches (T ₃ ) to (Tr), respectively.
With (E ₁ ), (En), and (Er) formed in an arc shape,
The switch operating member (45), which is disposed on the outer peripheral portion of the operation shaft (28A) and is attached to the operation shaft (28A) so as to rotate integrally, has a forward rotation movable contact (Ka) and a reverse rotation movable contact. (Kb) are installed respectively.

The forced stop means (Z) for forcibly stopping the traveling of the vehicle body from the time when the shift instruction means (W) outputs the shift instruction information for switching between the forward and backward movements until the shift is completed. Both steering clutches (13), (13) and both steering brakes (21), (21) are used.
The details will be described below.

However, when switching from reverse to forward, and when switching from first forward to reverse, the motor (28)
Since the time required to operate the control valve (19) due to the operation of is a minute time, the probability that the traveling clutch (4) will be engaged and operated by the time the shift is completed is small. Only when switching from the third speed and the second speed to the reverse speed state, the forced stop is performed.

That is, the control valves (50) and (50) for the hydraulic cylinders (49) and (49) that individually operate the pair of shift forks (48) and (48) are set as commands of the control device (C). It is provided so that it can be operated.

Then, as shown in the flow chart of FIG. 2, the switches (S ₃ ), (S ₂ ),
It is checked whether or not (S ₁ ), (Sn) and (Sr) are operated, and when they are operated, it is a shift to the reverse drive state and the current forward drive state is the 3rd speed or the 2nd speed. Only in the case of, the hydraulic cylinders (49) and (49) are operated until the elapsed time (T) reaches or exceeds the preset time (t ₁ ) and the left and right steering clutches (13) and (13) are activated. The turning operation is continued and the left and right steering brakes (21) and (21) are continuously operated in the control operation state. Therefore, the control device (C) is provided with a time setting means for setting the forced stop time (t ₁ ) in anticipation of the shift completion time in advance.

[Another embodiment]

INDUSTRIAL APPLICABILITY The present invention is applied to gear shifting of combine harvesters, tractors,
It can be applied to gear shifting of various work vehicles such as transport vehicles.

Further, the present invention is applicable to the case where the reverse gear is changed to a plurality of gears and the forward movement 1
It can also be applied to the case of shifting to the next stage, in short, if it is possible to suppress the reverse traveling to shift to the forward direction and the forward traveling to shift to the reverse direction. Good.

[Brief description of drawings]

The drawings show an embodiment of a shift operating device for a work vehicle according to the present invention, FIG. 1 is a schematic diagram showing the overall configuration of the shift operating device, FIG. 2 is a flow chart showing the control operation, and FIG. 3 is a motor and control. FIG. 4 is a side view showing a structure for linking with a valve, FIG. 4 is a schematic view thereof, FIG. 5 is a front view showing a motor mounting portion, and FIG. 6 is a front view showing a transmission structure. (4) …… Running clutch, (19) …… Control valve, (20
a), (20b), (20c) ... Forward clutch, (20) d
...... Reverse clutch, (H) …… Valve operation control means,
(W): shift instruction means, (Z): forced stop means.

Claims (1)

[Claims] 1. A hydraulically operated forward clutch (20a), (2
0b), (20c) and hydraulically operated reverse clutch (20d)
Is provided with a control valve (19) for selectively turning on and off, and valve control means (H) for automatically operating the control valve (19) based on instruction information from the gear shift instruction means (W) is provided. ,
A gear shift operating device for a work vehicle provided with a traveling clutch (4) for stopping driving and traveling, wherein the gear shift instructing means (W) outputs the gear shift instructing information for switching between forward and reverse directions and completes the gear shift. A shift operation device for a work vehicle, which is provided with a forced stop means (Z) having a time setting means for setting a forced stop time in advance to allow a shift completion time so as to forcibly stop vehicle travel.