JP2007218434A - Gear shift controller for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate operation of a sub gear shift lever by providing a shift-up switch and a shift-down switch for main shifting. <P>SOLUTION: A gear shift controller for a vehicle comprises a first shift unit (2) for shifting a gear position by transmitting operation of a gear shift lever (1) via a mechanical interlock member, a second gear shift unit (6) for shifting a gear position by driving shifting actuators (7, 8) by operating a shift-up switch (4U) or shift-down switch (4D) provided on the shift lever (1) and a forward/reverse switching unit (3) of switching the forward/reverse drive of a machine body by connecting a forward drive clutch (3F) and a reverse drive clutch (3R). The gear shift lever (1) has clutch operation switches (4U, 4D) provided on a grip section of the lever, and while the switch is being pushed, a control means (5) holds the forward drive clutch (3F) and the reverse drive clutch (3R) disconnected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a configuration of a transmission control device for a vehicle.

  Conventionally, agricultural tractors and the like, as disclosed in JP-A-5-52254, a first transmission (subchange) that switches a shift position by operating a shift lever via a mechanical interlocking member, and a shift up The second transmission (main change) that switches the shift position via the hydraulic cylinder drive by the switch operation of the switch-type shift operation unit for shifting and shifting down, and the transmission of engine rotational power is input by driving the clutch actuator One having a clutch mechanism (reverse change) that can be turned off is known.

Further, as disclosed in Japanese Patent Application Laid-Open No. 6-115367, there is known one in which a shift operation portion of the second transmission device is provided in a grip portion (grip portion) of a transmission lever that switches the first transmission device. . These conventional ones are intended for so-called no-clutch shifts that do not require a stepping-on operation of a clutch pedal by shifting a constant shift range through driving of an actuator.
JP-A-5-52254 JP-A-6-115367

  However, in the prior art, since only the shift range of the second transmission (main change) is switched by the actuator, the second transmission is raised or lowered by the switch-type shift operation unit, and this shift position is at its maximum. When high speed or minimum speed is reached, the first transmission needs to be manually and mechanically switched. At this time, in order to change the lever position, that is, to smoothly switch the gear, the clutch pedal must be depressed.

  For this reason, especially when shifting frequently between several upper and lower stages including the highest speed position or the lowest speed position of the second transmission, there is a case where the depression operation of the clutch pedal may or may not be necessary. There were annoyances such as tired feet by operating the pedals, and inability to continuously perform gear shifting operations.

  In view of the above, the present invention has taken the following technical means. That is, a first transmission (2) that switches a shift position via a mechanical interlocking member and a shift up switch (4U) or a shift down switch (4U) provided on the shift lever (1). 4D) The front and rear of the fuselage by connecting the second transmission (6) that switches the shift position via the drive of the shift actuators (7, 8) by the switch operation, the forward clutch (3F), and the reverse clutch (3R) And a forward / reverse switching device (3) for switching forward and backward, and a clutch operating switch (4U, 4D) is provided in the gripping portion of the shift lever (1). The vehicle transmission control device is characterized in that the control means (5) for holding the clutch (3R) together is provided.

  Since it is configured as described above, it is possible to change the speed by operating the shift up / down switch 4U or 4D of the gripping portion of the speed change lever 1, and to switch forward or reverse by operating the forward / backward changeover switch. By operating the clutch operating switches 4U and 4D, the forward clutch 3F and the reverse clutch 3R are both kept disconnected for the switch pushing time, so that the shift lever 1 and the switch can be switched without the need for clutch pedal operation. The gear change of the first transmission 2 can be easily performed by the operation.

Hereinafter, an embodiment of the present invention will be described with respect to a shift control device for an agricultural tractor (hereinafter, tractor 10) which is a work vehicle. First, the overall configuration of the tractor 10 will be described.
As shown in FIG. 1, the tractor 10 includes a diesel engine 11 inside a bonnet. After the rotational power of the engine 11 is input to various transmissions described later and appropriately decelerated, the rear wheel 12 or the front and rear wheels 13, 12 are input. It is configured to travel by transmitting.

  In front of the cockpit 15, there are provided a meter panel 16 equipped with various lamps serving as display means and a liquid crystal monitor, and a handle post 18 that projects a steering handle 17, and an accelerator lever or the like is projected from the side of the post. A left and right brake pedal, a clutch pedal 19 and the like are provided below the steering handle 17, and a limit switch 20 is provided at a rotating base portion of the clutch pedal 19 as means for detecting the depression operation of the pedal 19.

  Further, a y-type shift-type shift lever 1 is provided on the side of the cockpit 15 so that the shift position of the sub-transmission device 2, which will be described later, becomes a rod. The plate is switched through a mechanical interlocking member such as a link mechanism or a cam mechanism connecting these rod members. In addition, as shown in FIG. 2, the gripping portion of the transmission lever 1 has a pair of upper and lower parts for commanding up or down the shift positions of the first main transmission 6a and the second main transmission 6b as the second transmission from the current position. A shift operation unit (hereinafter referred to as a shift up switch 4U and a shift down switch 4D) is provided, and a plurality of actuators (first main transmission 6b described later) are provided by pressing these shift switches 4U (4D). The clutch piston of the main gear shift high speed clutch 8A and the clutch piston of the main gear shift low speed clutch 8B, the main gear shift first hydraulic cylinder 8A and the main gear shift first The two hydraulic cylinders 8B) are operated to switch the first and second main transmissions 6a and 6b in cooperation.

  Further, on the inner surface of the gripping portion of the speed change lever 1, there are a slide type forward / backward changeover switch 21 for switching forward and backward movement of the vehicle body, and a seesaw type work machine lifting switch 22 for changing the raising / lowering position of the work machine connected to the rear part of the vehicle body. Provided. Further, a PTO on / off switch 23 for turning on / off the rotation of the PTO shaft is provided outside the shift lever gripping portion.

  Further, on the side of the cockpit 15, a working machine lifting / lowering lever 24 is provided as a working machine lifting / lowering means different from the working machine lifting / lowering switch 22, and a potentiometer 25 for detecting the operation position is provided at the rotating base of the lever 24. ing. In the vicinity of the guide of the lever 24, various setting devices such as a raising position adjustment dial 26 as a means for restricting the rising height of the working machine and a lowering position adjustment dial 27 as a means for restricting the lower limit height of the working machine are provided. ing.

  The sensor 25 and the setting devices 26 and 27 are configured to be connected to various controllers 5 (a work machine elevating controller 5a and a shift controller 5b) which are control means below the cockpit 15. The tractor 10 includes a cylinder case that houses a hydraulic cylinder 30 for raising and lowering the work implement at the rear of the vehicle body. In addition, a three-point link mechanism 31 including a top link and left and right lower links is provided at the rear of the vehicle body, and a work machine 32 is connected to the link mechanism 31. In the illustrated example, a rotary work machine is connected. On one side of the lift arm, a lift arm angle sensor 33 is provided at the rotation base.

  As a result, the work machine controller 5a, which will be described later, matches the operation angle of the work machine lifting / lowering lever 24 with the set angle of the lift arm or according to the pushing operation of the work machine lifting / lowering switch 22. The solenoid 35s of the proportional pressure control valve 35 for raising or the solenoid 36s of the proportional pressure control valve 36 for lowering the work implement is energized to perform position control for raising and lowering the work implement 32.

  Next, the power transmission configuration and hydraulic circuit of the tractor 10 will be described with reference to FIGS. The rotational power of the engine 11 is intermittently operated by the main clutch 40 in the clutch housing, and the first main transmission 6a, the forward / reverse switching device 3, the second main transmission 6b, and the auxiliary transmission 2 in the transmission case are sequentially arranged. It is the composition which conveys.

  The first main transmission 6a is a so-called power shift type transmission having two types of clutches (main transmission high-speed clutch 8A and main transmission low-speed clutch 8B) of "high" and "low". The rotational power changed by the device 6a is transmitted to the forward / reverse switching device 3. Further, the clutches 8A and 8B are always configured to be either one by the first main shift switching control valve 41, or in the normal state, pressure oil is sent to the low-speed clutch 8B and the internal clutch piston is operated to crimp the clutch disk. Yes.

  The forward / reverse switching device 3 is a transmission comprising a forward clutch 3F, a reverse clutch 3R, and a counter shaft having a canter gear, which are also of the same wet multi-plate form. Through the oil path switching operation of the switching control valve 42 for switching, the disks of the forward clutch 3F and the reverse clutch 3R that correspond to each other are pressure-bonded. Further, when the switch 21 is set to “N (neutral)”, the power transmission of both clutches 3F and 3R is both “off”.

  The second main transmission 6b is a synchromesh gear transmission, and the rotational power output from the forward / reverse switching device 3 is transmitted to four gear groups (fourth gear group, third gear from the power upper side in the figure). The transmission is transmitted to the auxiliary transmission device 2 through any one of a set, a second gear set, and a first gear set). Further, a shifter ring having a synchro mechanism is provided between the drive side gears of the 4-speed gear set and the 3-speed gear set, and this ring is slid forward and backward by the expansion and contraction of the piston of the first hydraulic cylinder for main transmission 7A. It has become. That is, the power is transmitted through the 4-speed gear set by the extension of the piston of the cylinder 7A to become "4-speed", and the power is transmitted through the 3-speed gear set by the shortening of the piston of the hydraulic cylinder 7A. "

  Similarly, a shifter ring having a synchro mechanism is provided between the drive side gears of the second speed gear set and the first speed gear set, and the ring is slid back and forth by expansion and contraction of the piston of the second hydraulic cylinder for main transmission 7B. It has become. That is, the power is transmitted through the second speed gear set by the extension of the piston of the hydraulic cylinder 7B to become "second speed", and the power is transmitted through the first speed gear set by shortening the piston of the hydraulic cylinder 7B. Speed ". The hydraulic cylinders 7A and 7B are also configured to operate by switching the oil paths of the respective switching control valves 43 and 44, similarly to the hydraulic clutches 3F and 3R.

  Thereby, the 2nd main transmission 6b becomes a structure which has a 4-speed shift position. The auxiliary transmission 2 is a constant mesh gear type transmission that is switched through the mechanical interlocking member by manual operation of the transmission lever 1. Specifically, from the upper side in the figure, the first countershaft 45, the auxiliary transmission output shaft 46 provided with three transmission gears of “H speed”, “M speed”, and “L speed”, and the rear of the auxiliary transmission output shaft 46 are idled. A second countershaft 47 is provided in parallel with the reduction gear 50 that is rotatably provided.

  Then, when the shift lever 1 is rotated forward and forward along the y-type guide, the shifter 48 is slid forward and the sub-shift output shaft is connected via the “H” gear transmitted from the second main transmission 6b. 46 is directly connected to “H speed”, and when it is operated to rotate rearward and rearward, the shifter 48 is slid rearward, and rotational power is transmitted to the first counter shaft 45, “M speed” gear, auxiliary transmission output shaft 46. "M speed".

  Further, when the shift lever 1 is turned inward and rearward along the guide, the shifter 49 is slid forward, and the rotational power is the first countershaft 45, the reduction gear 50, the second countershaft 47, and the “L speed” gear. To “L speed”. Thereby, the auxiliary transmission 31 has a configuration having three shift positions.

  As described above, the tractor 10 is a combination of the first main transmission 6a, the second main transmission 6b, and the sub-transmission 2 in combination with each other, as shown in FIG. It is configured to obtain the reverse 24 shift stages, and is configured to shift the shift range of 1 to 8 stages, 9 to 16 stages, and 17 to 24 stages by operating the shift switches 4U and 4D. .

  3 indicates a front wheel drive device having a four-wheel drive clutch and a front wheel drive clutch for driving the front wheel 13 at a higher speed when turning, and reference numeral 53 indicates the switching of the PTO on / off switch 23. The PTO on / off clutch for turning on / off power transmission to the PTO shaft 52 is shown.

  Next, the control system of the tractor 10 will be described with reference to FIG. The controller 5 of the tractor 10 includes a work implement lifting controller 5a that processes information related to the work implement lifting mechanism, and a travel controller 5b that processes information related to shift control. The CPU includes a CPU that processes signals, a RAM that temporarily stores the signal information, an EEPROM that stores various control programs, a timer, and the like. These controllers are configured to transmit and receive each other's sensor information and output information via a communication line.

  The work machine elevating controller 5a is provided with the potentiometer 25 of the work machine elevating lever 24, the lift arm angle sensor 33, the raising position adjusting dial 26, the lowering position adjusting dial 27, and the like connected to the input unit, and the output unit includes A solenoid 35 s of a pressure proportional control valve 35 for raising the work machine that connects an oil passage to the hydraulic cylinder for raising and lowering the work machine, a solenoid 36 s of a pressure proportional control valve 36 for lowering the work machine, and the like are connected.

  On the other hand, the traveling controller 5b includes a forward / reverse selector switch 21, a clutch pedal base limit switch 20, a work implement lift switch 22, a shift up switch 4U, a shift down switch 4D, a PTO on / off switch 23, and the input unit. A solenoid of a switching control valve 42 for switching a pressure oil so as to press-fit the forward clutch 3F and the reverse clutch 3R to the output portion is provided by connecting a main shift position sensor or the like for detecting the operating position of the main shift hydraulic cylinder. 42f, 42r, solenoids 41s, 43a, 43b, 44a, 44b, etc. of switching control valves 41, 43, 44 for operating a plurality of speed change actuators of the first and second main transmissions 6a, 6b are connected. Provided.

  In the tractor 10 configured as described above, the shift control is executed as in the flowchart showing the outline of the shift control program shown in FIG. When the tractor 10 is first turned on and the engine is started, the travel controller 5b reads the states of various sensors and switches in STEP1. Then, in STEP2, it is determined whether or not the shift down switch 4D is pressed. If this is YES, it is determined in STEP3 whether or not the current shift position is the lowest speed, that is, the first speed. If this is also YES, the routine proceeds to STEP 4 where the switching control valve 42 is deenergized and the forward / reverse clutches 3F, 3R are moved to the neutral position for the time during which the signal of the shift down switch 4D is detected. Hold on.

  On the other hand, if the determination in STEP 3 is NO, energization is performed to the solenoid of each switching control valve of the main shift so that the gear is switched to the normal shift, that is, the shift position below the current position by the first speed. At this time, there are a method of lowering the current position by one speed each time the switch 4D is turned ON, and a method of lowering the current position by one speed according to the duration of the switch 4D being pressed.

  Similarly, when the shift up switch 4U is pressed, it is determined in STEP 7 whether the current shift position is the highest speed, that is, the eighth speed. If this is YES, the routine proceeds to STEP 8, and energization to the switching control valve 42 for operating the clutches 3F, 3R of the forward / reverse switching device 3 is stopped for the time during which the signal of the shift up switch 4U is detected. Thus, both clutches 3F and 3R are held in the neutral position.

  Note that the front and rear clutches 3F and 3R of the forward / reverse switching device 3 are also set to the neutral position when the main transmission devices 6a and 6b are switched by the shift switches 4U and 4D. Based on this, the clutch is automatically crimped again. When the auxiliary transmission 2 is switched to the high speed side, the main transmission is automatically switched to the low speed side (for example, the first speed), and when the auxiliary transmission 2 is switched to the low speed side, the main transmission is automatically switched to the high speed side (for example, the eighth speed). It is the structure which can be switched automatically.

  In the shift control device for the tractor 10 configured as described above, when the shift up switch 4U or the shift down switch 4D of the grip portion of the shift lever 1 is pushed in, the power transmission state of the forward / reverse clutches 3F and 3R is maintained during this time. Since it is kept off, it is possible to switch the gear according to the operation time and operation feeling of the operator's operation.

  In addition, since the shift up switch 4U and the shift down switch 4D are used as the operation unit for turning off the power transmission state of the clutches 3F and 3R without providing a separate operation unit for clutch disconnection, the number of parts is reduced and the production cost is reduced. In addition, when continuously shifting up or down, the sub-transmission device and the main transmission device can be switched while holding the transmission lever 1, and the stepping operation of the clutch pedal 19 is not required as described above. Shifting operation is simplified.

  Furthermore, since the clutches 3F and 3R of the forward / reverse switching device 3 are used without separately providing a clutch mechanism capable of turning on and off the transmission of the rotational power of the engine 11, the number of parts is reduced and the production is reduced as described above. Cost can be reduced. The clutch mechanism may be a method using the second main transmission 6b, or in the case where another transmission is provided, the transmission may be provided with an actuator to cut off power transmission.

  Next, details of the shift control will be described. The flowchart shown in FIG. 8 is a control flow that is performed when the tractor 10 is started or started. Here, after reading the state of various sensors and switches in STEP 1, in STEP 2, the shift up switch 4U or the shift down is performed. It is determined whether or not the switch 4D is pressed and whether or not the clutch pedal 19 is depressed in STEP3. If both of these are YES, the gearshift position is set to 1 for each ON duration of the switch 4U (4D) in STEP4. Increase or decrease speed. Further, when the determination in STEP 3 is NO, the processing of STEP 4 is jumped to restrict the operation, and the speed is increased or decreased by one speed every time the switch is turned on.

  As a result, when the operator intends to operate the start of the tractor 10, that is, when the depression of the clutch pedal 19 is detected, the target vehicle speed is quickly set without the need to push the switches 4U and 4D. Thus, the speed change operation can be improved.

  Next, regarding the control of the work implement lifting / lowering controller 5a, processing by operating the work implement lifting / lowering switch 22 will be described in particular. The work implement raising / lowering switch 22 is provided with a two-stage switch for raising and lowering the work implement, and when the push operation of the switch is shallow, that is, an operation for slightly raising and lowering the work implement 32. When the push operation is deep, that is, the operation of raising and lowering the work machine 32 to the highest position or the lowest position at a stroke is distinguished. Further, the lifting speed is such that the lift arm position during operation is read as appropriate, and the energization amount to the solenoids 35s and 36s of the proportional pressure control valves 35 and 36 is changed according to the difference from the target value.

  As described above, the operation unit for raising and lowering the work implement is provided in the gripping portion of the speed change lever 1, so that the work implement 32 can be raised and lowered at the same time as the speed change operation so that the work can be performed quickly. In addition, since the switch 22 is pushed in two steps, in the field of the conventional working machine lifting device, a configuration for operating the micro lifting / lowering operation of the working machine and the operation of largely raising / lowering to a preset target position by separate operating members. In comparison with the above, the raising / lowering operation can be changed continuously even in response to a change in the situation, and the operability can be improved.

The whole tractor side view. The perspective view of a transmission lever. The transmission mechanism figure of a tractor. The figure which shows the combination of each gear position. 1 is a partial hydraulic circuit diagram of a tractor. The figure which shows the connection state of a controller. The flowchart (1) which shows the outline | summary of transmission control. The flowchart (2) which shows the outline | summary of transmission control. Flow chart showing the outline of position control (1) Flow chart showing the outline of position control (2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shift lever 2 Subtransmission 3 Forward / reverse switching device 4U Shift up switch 4D Shift down switch 5 Controller 6 Main transmission 7A Main transmission first hydraulic cylinder 7B Main transmission second hydraulic cylinder 8A Main transmission high speed clutch 8B Main Low speed clutch for shifting 10 Tractor

Claims (1)

A first transmission (2) that switches a shift position via a mechanical interlocking member, and a shift up switch (4U) or a shift down switch (4D) provided on the shift lever (1). The second transmission (6), which switches the shift position via the drive of the shift actuators (7, 8) by operating the switch, the forward clutch (3F) and the reverse clutch (3R) are connected to move the vehicle forward and backward. A forward / reverse switching device (3) for switching is provided, and a clutch operating switch (4U, 4D) is provided in the gripping portion of the speed change lever (1), and the forward clutch (3F) and the reverse clutch during the pushing time of the switch A vehicle speed change control device provided with a control means (5) for holding both (3R) in a cut state.

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