JPH08275664A - Travel speed change gear - Google Patents

Abstract

PURPOSE: To provide a travel speed change gear capable of performing the smooth speed change operations even in a constitution for receiving and regulating a speed change operating tool at a position corresponding to the travel neutral state. CONSTITUTION: This travel speed change gear is obtained by installing a speed change operating tool 30, mechanically linked to an operated part 14 of an infinite variable-speed device 10 for traveling a car body and capable of freely performing artificial operations in the normal and reverse directions, a regulating part for receiving and regulating the speed change operating tool 30 at a position corresponding to the travel neutral state in decelerating and operating the speed change operating tool 30 to the travel neutral state and a controller capable of controlling the operations of an electric motor 33 for operating the operated part 14 based on whether or not the speed change operating tool 30 is in an operating state thereof artificially operated and the results sensed with a sensing means 40 for the operating state capable of sensing the operating direction of the speed change operating tool 30. The travel speed change gear is further capable of stopping the operations of the electric motor 33 when an inoperative state of the speed change operating tool 30 is sensed and the sensed state continues for the set time without keeping the speed change operating tool 30 in the travel neutral state or a state close thereto and stopping the operations of the electric motor 33 in a shorter time than the set time when the inoperative state is sensed in the neutral state or a state close thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical linkage mechanism in which a gear shift operation tool which can be manually operated in forward and reverse directions and an operated portion which is movable in forward and reverse directions in a continuously variable transmission for vehicle body travel. When the speed change operation tool is decelerated to a running neutral state, a receiving restriction part is provided for restricting the speed change operation tool to the running neutral state, and a drive operation means for moving the operated part. And, based on the detection result of the operation state detecting means and the operation state detecting means for detecting whether the shift operation tool is in the operation state of being manually operated, and the operation direction in the operation state, The present invention relates to a travel transmission device including a shift control unit that controls the operation of a drive operation unit.

[0002]

2. Description of the Related Art In the above-mentioned traveling transmission, conventionally,
Based on the manual operation of the speed change operation tool, after the drive operation means moves the operated part, the operation of the speed change operation tool is stopped,
When the operation state detection means detects that the operation state is not the operation state, the operation of the drive operation means is stopped after the detection state continues for the set time, regardless of the operation position of the gear shift operation tool. Was there.

In such a structure, for example, the manual operation speed of the speed change operation tool is lower than the operation speed of the drive operation means while the operated portion is moved by manually operating the speed change operation tool in a predetermined direction. In such a case, it is possible that the detection state by the operation state detection means is determined to be not the operation state for a short time shorter than the set time. The operation of the means is continued so that a smooth gear shift operation can be performed.

[0004]

In the above-mentioned conventional structure, when the gear shift operation tool is always stopped based on the manual operation force, smooth gear shift operation can be performed, but the gear shift operation tool is placed in the running neutral state. When decelerating,
Since the speed change operation tool is configured to be received and regulated by the receiving regulation portion at a position corresponding to the traveling neutral state, there is a possibility that the following trouble may occur.

That is, although the shift operation tool is received by the receiving restriction tool and further operation is restricted, the drive operation means is operated until the set time elapses after the operation of the shift operation tool is stopped. The operation is continued, the operated part is over-operated with respect to the gear shift operation tool,
The operation state detection means may relatively detect the operation state in the reverse operation direction (acceleration side direction).

As a result, after the set time has elapsed, the drive operation means starts to operate and the operated portion moves in the opposite direction (acceleration side direction), contrary to the operator's intention. However, there is a possibility that a problem may occur in that the gear shift operating device that is linked via the mechanical linking mechanism also moves in the opposite direction (acceleration side direction).

[0007] At this time, if the gear shift operation member which is contrary to the intention is operated to return to the neutral state, the operation state detecting means again detects the operation state in the reverse operation direction and drives. Since the operating means is operated in the reverse direction, the drive operating means is likely to perform a so-called hunting operation in which the forward and reverse operations are repeatedly performed within a minute range.

Further, as described above, if the operated portion moves in the opposite direction (acceleration side direction), there is a disadvantage that it may come out of the running neutral state.

The present invention has been made paying attention to such a point, and an object thereof is to perform a smooth gear shift operation even when the gear shift operation tool is received and regulated at a position corresponding to a running neutral state. The point is to provide a traveling transmission capable of performing.

[0010]

The features of the first invention are as follows:
A speed change operation tool that can be manually operated in forward and reverse directions and an operated portion that is movable in forward and reverse directions in a continuously variable transmission for vehicle body travel are linked through a mechanical linking mechanism, and the speed change operation tool travels. When a deceleration operation is performed to a neutral state, a receiving regulation portion that receives and regulates the shift operation tool at a position corresponding to the running neutral state is provided, and drive operation means for moving the operated portion and the shift operation tool are provided. An operation state detecting means for detecting whether or not the operation state is being manually operated and an operation direction in the operation state, and controlling the operation of the drive operating means based on the detection result of the operation state detecting means. In the traveling transmission device including the shift control means for
Neutral state detecting means for detecting whether or not the running neutral state or a state close thereto is provided, and the shift control means, by the operation state detecting means in a state in which the neutral state detecting means is not detecting and operating. When it is detected that the operation state is not detected and the detection state continues for a set time, the operation of the drive operation means is stopped, and the operation state detection is performed while the neutral state detection means is in the detection operation. Immediately when the means detects that the operation state is not the operating state, or when the detected state continues for a time shorter than the set time, the operation of the drive operating means is stopped.

A characteristic structure of the second invention is to specify a structure suitable for carrying out the first invention, in which the neutral state detecting means is a switch for detecting and operating based on an operation position of the speed change operation tool. It is in the point that is configured.

A characteristic configuration of the third invention is to specify a configuration suitable for carrying out the first invention, wherein the neutral state detecting means is based on detection information of a vehicle speed detecting means for detecting a vehicle traveling speed. The point is configured to detect whether or not the vehicle is in the traveling neutral state or a state close thereto.

The characteristic configuration of the fourth invention is the first, second or third invention.
It is intended to specify a configuration suitable for carrying out the invention, and the drive operation means is constituted by an electric motor.

The characteristic configuration of the fifth invention is that the first, second, and third
Alternatively, the configuration suitable for carrying out the fourth aspect of the invention is specified, and the operation state detecting means determines the operation state and its operation direction based on the relative displacement between the speed change operation tool and the operated portion. It is composed of a pair of switches for detection.

[0015]

According to the characterizing feature of the first invention, when the neutral state detecting means has not detected that the vehicle is in the traveling neutral state or a state close to the traveling neutral state, the operating state detecting means detects that the vehicle is not in the operating state. When the detected state continues for the set time, the operation of the drive operation means is stopped.

Therefore, even when it is detected that the vehicle is not in the operating state for only a short time when the gear shifting operation is performed in the normal traveling state (state not in the traveling neutral state),
A smooth operation can be performed without stopping the driving operation means.

A state in which the neutral state detecting means detects that the vehicle is in the traveling neutral state or a state close to the running neutral state,
That is, in a state in which the shift operation tool is positionally regulated by the receiving regulation tool and operation is stopped, as soon as it is detected by the operation state detection means that it is not in the operation state, or the detected state is longer than the set time. When the operation is continued for a short time, the operation of the drive operation means is stopped.

Therefore, even when the shift operation tool is stopped by the contact restriction tool, the drive operation means can be operated with a small time delay from the time when the operation status detection means detects it. Since the operation is stopped, there is less possibility that the operation state detecting means detects the reverse operation state due to the excessive operation.

According to the characterizing structure of the second invention, the following function is obtained in addition to the function of the characterizing structure of the first invention. The switch detects whether or not the speed change operation tool is at a position corresponding to or close to the running neutral state, and based on the detection information of the switch, it is detected whether the shifting operation state is the running neutral state or a state close thereto. To be done.

According to the characterizing structure of the third invention, the following function is provided in addition to the function of the characterizing structure of the first invention. Based on the detection information of the vehicle speed detection means, it is detected whether or not the vehicle is in a running neutral state or a state close thereto.

According to the characteristic configuration of the fourth invention, the first and second
Alternatively, the following operation is provided in addition to the operation according to the characteristic configuration of the third invention. Since the drive operation means is composed of an electric motor,
As compared with other drive means such as a hydraulic actuator, control such as starting and stopping operation can be performed relatively easily.

According to the characterizing feature of the fifth invention, there are the following effects in addition to the effects of the characterizing feature of the first, second, third or fourth invention. When the speed change operation tool is manually operated, it is relatively displaced with respect to the operated tool, and one of the pair of switches becomes a detection state based on the displacement, so that the operation state is surely made in each of the forward and reverse operation directions. It can be detected.

[0023]

According to the characteristic construction of the first aspect of the invention, it is possible to avoid the disadvantage that the drive operation means malfunctions due to an erroneous operation, a vibration of the vehicle body or the like in the gear shifting operation while the vehicle body is running, Even if it is a structure that allows smooth operation, even if the speed change operation tool is received and regulated at the position corresponding to the traveling neutral state, the disadvantage that the drive operation means becomes hunting state due to the reception regulation is eliminated. Therefore, it is possible to provide a traveling transmission device capable of performing a smooth shift operation over the entire operation range.

According to the characterizing structure of the second invention, the following effects are obtained in addition to the effects of the characterizing structure of the first invention. Whether or not the vehicle is in a traveling neutral state or a state close thereto can be reliably detected by mechanical displacement.

According to the characterizing structure of the third invention, the following effect is obtained in addition to the effect of the characterizing structure of the first invention. Since it is configured to detect whether the vehicle is in the running neutral state or a state close thereto based on the detection information of the vehicle speed detecting means, the detection information of the vehicle speed detecting means can be used for other control.

According to the characteristic configuration of the fourth invention, the first and second aspects are provided.
Alternatively, there are the following effects in addition to the effects of the characteristic configuration of the third invention. Compared with the case of using a hydraulic actuator,
The drive operation for shifting can be performed with a relatively simple structure.

According to the characterizing feature of the fifth invention, the following effect is obtained in addition to the effect of the characterizing feature of the first, second, third or fourth invention. It is possible to reliably detect the operation state and the operation direction of the gear shift operation tool based on the mechanical displacement.

[0028]

Embodiments will be described below with reference to the drawings. FIG.
FIG. 1 shows a power transmission mechanism for driving a vehicle body in a combine, in which power of an engine 1 mounted on a vehicle body is transmitted through a belt tension clutch 2 to a continuously variable transmission 1 for traveling.
0, and the shift output of the continuously variable transmission 10 for traveling is
It is configured to be transmitted to the left and right crawler traveling devices 5 and 5 via a traveling mission 4 provided with a forward / reverse switching mechanism 3 and a steering clutch (not shown).
The shift output of the continuously variable transmission 10 is also transmitted to the mowing section.

As shown in FIG. 2, the traveling continuously variable transmission 10 includes a pair of belt pulleys 1 inside a transmission case 11 connected to and supported by a casing of a traveling mission 4.
The transmission belt 12 is wound over 8 and 19, and the belt type continuously variable transmission is configured to change gears by changing the winding diameter of the transmission belt 12 with respect to the belt pulleys 18 and 19. That is, the input shaft 13 having the output side belt pulley 2a of the belt tension clutch 2 integrally rotatable is attached to one end side of the transmission case 11 so as to be rotatable via a ball bearing 15. An output shaft 16 having a transmission portion 16a for the traveling mission 4 is rotatably attached to the other end side of the shaft via a ball bearing 17.

The transmission belt 12 is wound around the input side belt pulley 18 attached to the input shaft 13 and the output side belt pulley 19 attached to the output shaft 16, and the input side belt pulley 18 is attached to the input shaft 13. The fixed side split pulley portion 18a mounted so as to be integrally rotatable only so as not to slide in the axial direction of the input shaft 13 and the input shaft 1
A fixed split pulley portion 18b that is integrally rotatable with the ball 3a through engagement with the ball 13a and is slidably mounted in the axial direction of the input shaft 13 by the action of the long groove shape of the ball mounting groove 18c. It is composed of a split pulley. Further, the output side belt pulley 19 is the output shaft 1
6 and the first split pulley portion 19b mounted so as to be rotatable relative to each other and slidable in the axial direction of the output shaft 16; The second split pulley portion 19a fixed so as not to slide on the
It is configured as a split pulley. Between the first split pulley portion 19b of the output side belt pulley 19 and the spring receiving member 22 attached to the output shaft 16, the first split pulley portion 19b is slidably biased toward the second split pulley portion 19a. A coil spring 21 is provided, and a belt tension cam mechanism 50 that maintains the transmission belt 12 in a transmission tension state by utilizing relative rotation between the first split pulley portion 19b and the output shaft 16 is provided.

Therefore, in this continuously variable transmission, the power from the belt tension clutch 2 is introduced by the input shaft 13, is transmitted to the output shaft 16 by the transmission belt 12, and is transmitted from the output shaft 16 to the traveling mission 4. The movable side split pulley portion 18b of the input side belt pulley 18 is slid on the input shaft 13 so as to approach or separate from the fixed side split pulley portion 18a. As the belt wrapping diameter changes, the first split pulley portion 19b of the output side belt pulley 19 and the tension of the transmission belt 12 change accordingly.
Due to the urging force of the coil spring 21, it approaches the second split pulley portion 19a or separates from the second split pulley portion 19a and the belt winding diameter of the output side belt pulley 19 changes. As a result, the transmission ratio between the input side belt pulley 18 and the output side belt pulley 19 changes steplessly, and the rotational force from the belt tension clutch 2 is steplessly changed and transmitted to the traveling mission 4. There is.

A ring-shaped cam follower supporting member 24 is rotatably attached to a boss portion of the movable side split pulley portion 18b of the input side belt pulley 18 fitted on the input shaft 13 via a ball bearing 23. The cam follower support member 24 is provided on the movable side split pulley portion 18
When b slides on the input shaft 13, the stopper ring 25 acting on the ball bearing 23 moves together with the movable split pulley portion 18b. A roller type cam follower 27 is attached to the cam follower support member 24 via a support shaft 26. The locking roller 28 attached to the support shaft 26 causes the transmission case 11
The cam follower 27 abuts inside the guide groove 11a formed in the above, and enables the cam follower 27 to move in the axial direction of the input shaft 13, but does not rotate together with the movable side split pulley portion 18b. .

The ball bearing 15 which supports one end of the input shaft 13 is supported by a tubular rotation operating portion 14 which is rotatably fitted in a bearing hole of the transmission case.
The first roller 27 is attached to the large-diameter portion on one end side of the rotating operation portion 14.
Acting on the first to third operation cam portions 14a, 1 as shown in FIG.
4b and 14c are formed, and the continuously variable transmission 10 for traveling is gear-shifted by rotating the rotating operation portion 14 around the axis X of the input shaft 13. That is, when the rotating operation portion 14 is rotated to bring the first operation cam portion 14a to the neutral position corresponding to the cam follower 27, the movable split pulley portion 18b moves from the fixed split pulley portion 18a due to the belt tension. Farthest away,
Slip occurs between the transmission belt 12 and the input side belt pulley 18 and the transmission is cut off. First operation cam portion 14
When the second operation cam portion 14b or the third operation cam portion 14c located on both sides of a is in the transmission position corresponding to the cam follower 27, the second operation cam portion 14b or the third operation cam portion 14c has an inclined shape. Then, the cam follower 27 is pressed to push the movable split pulley portion 18b toward the fixed split pulley portion 18a, so that the transmission belt 12 enters the transmission tension state for transmission. When the second operation cam portion 14b corresponds to the cam follower 27, when the rotation operation portion 14 is rotated in the forward rotation direction A, the movable split pulley portion 18b approaches the fixed split pulley portion 18a and the speed is increased. When the operating portion 14 is rotated in the reverse rotation direction B, the movable split pulley portion 18b moves away from the fixed split pulley portion 18a and shifts to the deceleration side. When the third operation cam portion 14c corresponds to the cam follower 27, when the operation portion 14 is rotated in the forward rotation direction A, the movable split pulley portion 18b separates from the fixed split pulley portion 18a and shifts to the deceleration side. When the operation portion 14 is rotated in the reverse rotation direction B, the movable split pulley portion 18b approaches the fixed split pulley portion 18a, and the speed change operation is performed.

The gear shifting operation structure of the traveling continuously variable transmission 10 will be described. As shown in FIGS. 1 and 2, a gear shift lever 30 as an operating tool of the traveling continuously variable transmission 10 is provided so as to be swingable back and forth, and based on the manual operation of the gear shift lever 30, the continuously variable transmission is provided. 10 is configured to be gear-shifted, and the manipulation becomes heavy only by manual operation. Therefore, the gear-shifting operation (rotational operation of the rotation operation section 14) is assisted by the electric motor 33 as a drive operation means. Is configured.

A base end side lever portion 30 rotatably attached to the portion of the transmission case 11 supporting the input shaft 13 via the boss portion 31a of the interlocking member 31 about the axis X.
a and a tip side lever portion 30b swingably connected to the base end side lever portion 30a around an axis Y, and a swinging direction around the axis X of the input shaft 13 and the axis center. It is constructed so that it can be rocked in a cross direction with respect to the rocking direction around Y. Therefore, as shown in FIG. 5, the forward shift guide groove 32a and the reverse shift guide groove 3 are formed.
2c and the intermediate guide groove 32b forming the operation state switching step portion can be rocked along the respective guides.

The interlocking member 31 is provided rotatably around the axis X of the input shaft 13 with respect to the transmission case 11,
The rotary operation unit 14 is mechanically connected to rotate integrally.

A fan-shaped gear portion 31b formed on the interlocking member 31
Further, by engaging the output pinion gear 33a of the direct-current electric motor 33 which can be driven in the forward and reverse directions as an example of the drive operation means, the electric motor 33 moves the rotation operation unit 14 through the interlocking member 31. Is configured. The electric motor 33 is fixedly attached to the transmission case 11 via the bracket 48. Therefore, when the electric motor 33 is rotated, the output pinion gear 33a causes the interlocking member 31 to rotate around the axis X with respect to the transmission case 11. The rotation operation unit 14 rotates together with the interlocking member 31. Therefore, the rotation operation portion 14 as the operated portion is linked via the mechanical linkage mechanism so as to move integrally with the speed change lever 30, and is configured to be operable in the forward and reverse directions.

In the belt type continuously variable transmission 10, the change characteristic of the shift output (vehicle speed) with respect to the operation amount of the shift lever 30 is as shown in FIG. 8 when the vehicle speed is on the low speed side. The non-linear characteristic is such that the change amount of the vehicle speed with respect to the unit operation amount of is small and increases with increasing speed.

Incidentally, as shown in FIG. 1, an operating portion 3a of a forward / reverse switching mechanism 3 incorporated in the traveling mission 4,
When the interlocking member 31 is connected by the interlocking cable 6 and the shift lever 30 is positioned in the guide groove 32a, the forward / reverse switching mechanism 3 switches to the forward traveling state, and the shift lever 30 is positioned in the guide groove 32c. In the case of being driven, the forward / reverse switching mechanism 3 is mechanically linked so as to switch to the reverse traveling state.

An operating arm 30c extends radially outward from the base end side lever portion 30a.
0c is provided with an operation pin 41 along the axis X direction at the swinging end, and the operation pin 41 has a pin hole 31c of the interlocking member 31.
Within the range that can enter and move inside the pin hole 31c,
The speed change lever 30 and the interlocking member 31 are configured to relatively move around the axis X over a minute range. Then, the first operation detection switch SW1 and the second operation detection switch SW2 are arranged so as to be distributed to both sides of the operation pin 41 in the rotation direction of the interlocking member 31, and the interlocking member 3 is provided.
The operation state detecting means 4 attached to the switch 1 for detecting the operation direction and operation state of the shift lever 30 by the first and second operation detection switches SW1 and SW2.
0 is configured.

The first and second operation detection switches SW1,
As shown in FIG. 6, SW2 is covered with a highly elastic rubber G, and a pair of electrodes 43, 4 is interposed via an insulating spacer 42.
4 is internally provided with a slight gap, and when a pressure of a predetermined value or more is applied from the outside, it is configured to conduct conduction (turn on) with an extremely small stroke.

The speed change lever 30 is attached to the guide grooves 32a, 32
The moving direction U in the forward guide groove 32a of b and 32c
When the backward operation guide groove 32c is swung in the moving direction D, the switch operation pin 41 moves the first operation detection switch SW.
Press 1 to switch. The shift lever 30 is moved in the moving direction D by the forward guide groove 32a, and the reverse guide groove 32
When the rocking operation is performed in the moving direction U with c, the switch operation pin 4
1 presses the second operation detection switch SW2 to perform a switching operation. As a result, the operating state and operating direction of the shift lever 30 are detected. That is, when both the first and second operation detection switches SW1 and SW2 are in the non-operation state,
When it is detected that the gear shift lever 30 is not operated, and when one of the first and second operation detection switches SW1 and SW2 is switched and operated, the gear shift lever 30 is operated. It is detected that the switch is being operated, and by knowing which one of the first and second operation detection switches SW1 and SW2 is being switched, the operation direction of the shift lever 30 is determined by the rotation operation unit 14.
It is detected which of the forward rotation direction A and the reverse rotation direction B is the operation direction to be rotated.

As shown in FIG. 7, the detection information of each of the operation detection switches SW1 and SW2 is given to a control device 45 as a shift control means, and the control device 45 is based on these detection information and the electric motor 33. Is configured to be driven and controlled. The control device 45 is configured to include a microcomputer, supplies a pulse signal to the motor drive circuit 46 to drive the electric motor 33 in the forward and reverse directions, and changes the duty ratio of the pulse signal.
It is configured so that the drive speed of the electric motor 33 can be changed.

The shift lever 30 is attached to the guide grooves 32a, 32
When it is rocked along b and 32c and positioned in the guide groove 32b, the rotary operation part 14 is set to the neutral position, and the traveling continuously variable transmission 10 is in the transmission cut-off state. Speed change lever 3
When 0 is swung in the moving direction U along the forward guide groove 32a, the electric motor 33 causes each operation detection switch SW to move.
1, the rotation operation unit 14 is moved in the forward rotation direction A based on the information from the SW2, and the traveling continuously variable transmission 10 shifts to the forward high speed side. Guide groove 32 for electric lever 30
When the rocking operation is performed in the movement direction D along a, the electric motor 33 operates the rotation operation unit 14 in the reverse rotation direction B based on the information from the operation detection switches SW1 and SW2, and the traveling continuously variable transmission is performed. The device 10 shifts to the forward low speed side.

When the speed change lever 30 is swung in the moving direction U along the reverse guide groove 32c, the electric motor 33 is moved.
Operates the rotating operation part 14 in the reverse rotation direction B based on the information from the operation detection switches SW1 and SW2, and the traveling continuously variable transmission 10 shifts to the reverse high speed side. When the speed change lever 30 is swung in the movement direction D along the guide groove 32c, the electric motor 33 causes the operation detection switch SW.
1, the rotation operation section 14 is rotated in the forward rotation direction A based on the information from the SW2, and the traveling continuously variable transmission 10 shifts to the reverse low speed side.

The gear shift lever 30 has the forward guide groove 32a.
Alternatively, when the reverse guide grooves 32c are operated along the movement direction D (deceleration side operation direction), the respective guide grooves 3 are formed.
Inner edge k of 2a, 32c (corresponding to the receiving regulation portion)
At the position corresponding to the traveling neutral state,
0 is forcibly received and regulated, and is configured so as not to be switched to the running state in the front-rear reverse direction due to excessive operation.

The electric motor 33 has a spur gear type speed reduction mechanism (not shown) incorporated therein. For example, even if the electric motor 33 cannot be driven due to a failure or the like, the speed change lever 30 is manually operated. By doing so, the rotation operation of the rotation operation section 14 (in particular, the deceleration operation) can be performed.
Further, when the shift lever 30 is stopped in the middle of the lever stroke in a normal motor operating state, an electromagnetic braking mechanism for stopping the rotation of the rotation operation portion 14 in order to hold it at the shift position (see FIG. (Not shown).

A strain amount sensor 47 such as a strain gauge as an operation load detecting means for detecting an operation load applied to the gear shift lever 30 by a manual operation as a strain amount of the lever is a proximal end side of the gear shift lever 30. Is provided on the basis of the detection information of the strain amount sensor 47,
The controller 45 controls the operation detection switches SW1 and SW2.
Is set so that the operating speed of the electric motor 33 becomes higher as the maximum value of the operating load increases while the operating state is being detected, and the operating speed is set while the operating state is being detected. And is configured to maintain a controlled operating speed.

A vehicle speed sensor 49 as a vehicle speed detecting means for detecting the vehicle speed based on the number of rotations of the axle is provided inside the traveling mission 4. Based on the detected vehicle speed detected by the vehicle speed sensor 49, The operating speed of the electric motor 33 set based on the maximum value of the operating load is configured to be corrected for acceleration / deceleration. Further, as will be described later, it is determined whether or not the control device 45 is in the traveling neutral state based on the detection information of the vehicle speed sensor 49.
Therefore, the neutral state detection unit TU is provided in the control device 45 as a control program.

Next, the control operation of the control device 45 will be described. As shown in FIGS. 9 and 10, when the ON state of the first operation detection switch SW1 is detected, the strain amount sensor 47 is detected.
The maximum value of the operation load on the gear shift lever 30 is read based on the detection information of (steps 1 and 2), and the larger the operation load maximum value (maximum load) is, the faster the change characteristic is determined. Based on this, the duty ratio of the pulse signal applied to the motor drive circuit 46 is set (step 3). Then, the current traveling vehicle speed is read based on the detected value of the vehicle speed sensor, the duty ratio correction amount is obtained based on the detected vehicle speed, and the set duty ratio set as described above is corrected (steps 4 and 5). . More specifically, as shown in FIG. 8, when the detected vehicle speed is in the low speed range lower than the first set value V1, the duty ratio is not corrected, and the detected vehicle speed is higher than the first set value V1 In the medium speed range lower than the set value V2, the set duty ratio is corrected to the deceleration side with a relatively small correction amount.
Then, when the detected vehicle speed is in the high speed range higher than the second set value V2, the set duty ratio is corrected to the deceleration side with a larger correction amount. That is, the lower the detected vehicle speed is, the more the operating speed of the electric motor 33, that is, the shift operation speed, is corrected to be lower.

Then, the O of the first operation detection switch SW1
After the N state is detected, when the ON state continues for the first set time T1 [for example, 200 msec (millisecond)] or more (step 6), a pulse signal is sent to the motor drive circuit 46 at the corrected set duty ratio. The output is performed and the electric motor 33 is rotationally driven in the forward rotation direction (direction A) (step 7). The ON state is the first set time T1 (200 ms
If less than ec), the operation is not executed and the process returns to step 1. After that, when the maximum load on the shift lever 30 changes, the duty ratio is set based on the new maximum load (steps 8, 2 and 3). If the maximum load does not change, the first operation detection switch SW1 is in the OFF state. Until is detected, a pulse signal is output to the motor drive circuit 46 at the set duty ratio corrected based on the detected vehicle speed, and the electric motor 33 is driven in the normal direction (step 9).

During the driving of the electric motor 33, the first
When the OFF state of the operation detection switch SW1 is detected, the driving of the electric motor 33 is stopped. At that time,
Based on the detection information of the vehicle speed sensor 49, it is determined whether or not the operation is to the deceleration side (step 10). If the operation is not to the deceleration side, that is, if the operation is to the acceleration side, the first
If the OFF state of the operation detection switch SW1 continues for the second set time (for example, 40 msec) or more, the operation of the electric motor 33 is stopped (steps 11 and 12).

When the operation is to the deceleration side, it is judged whether or not the vehicle is in the traveling neutral state based on the detection information of the vehicle speed sensor 49 (step 13). If the vehicle is not in the neutral state, the first operation is detected. If the OFF state of the switch SW1 continues for the second set time T2 (40 msec) or more, the operation of the electric motor 33 is stopped (steps 14 and 12). If the switch SW1 is in the neutral state, the OFF state of the first operation detection switch SW1 is set. , A third set time T3 shorter than the second set time T2
The operation of the electric motor 33 is stopped (steps 15 and 12) if it continues for more than (5 msec), and if it is in the neutral state, the operation is quickly stopped so that the speed change lever 30 contacts the inner edge k of the guide groove. Then, the hunting operation is suppressed.

That is, when the deceleration operation is performed in the neutral state, the electric motor 33 operates while the shift lever 30 is in contact with the inner end edge k of the guide groove and further movement is restricted.
When the first operation detection switch SW1 detects the OFF state by the further rotation of the rotation operation unit 14, the third set time T3 (5 mse) that is short from the time when the first operation detection switch SW1 is switched to the OFF state is detected.
If the OFF state continues only for c), the operation of the electric motor 33 will be stopped. Therefore, due to excessive operation of the electric motor 33, the second operation detection switch SW2 is switched to the ON state and a hunting operation occurs. It is configured so that it can be suppressed.

The set times T1, T2 and T3 are as follows.
The values are not limited to the values described above, and various changes can be made based on various situations.

Further, when the ON state of the second operation detection switch SW2 is detected (step 16), the same control as the above-mentioned control is performed such that the operation direction of the electric motor 33 is the reverse direction (reverse rotation direction). Is executed (steps 17 to 30).

As described above, the electric motor 33 is operated at a higher speed as the maximum value of the operating load is larger. Therefore, the gear shifting is performed at a speed suitable for the operation feeling of human operation, and the lower the vehicle speed is, the faster the electric motor is operated. Since 33 operates, the electric motor 33 operates faster on the low speed side where the vehicle speed change with respect to the lever operation amount is small, and operates slowly on the high speed side where the vehicle speed change with respect to the lever operation amount is large. It is possible to prevent sudden changes and improve driving safety. Further, in the medium speed range in which turning traveling or the like is executed, the operating speed becomes a little low so that the speed can be easily adjusted. Moreover, when the speed change lever 30 is in the neutral state and is abutted and regulated by the inner end edge k of the guide groove, hunting does not occur due to excessive operation of the electric motor 33.

[Other Embodiments] (1) In the above embodiment, the first operation detection switch SW1 is turned off when the neutral state detection means is in the detection operation.
The state is the third set time T3 which is shorter than the second set time T2.
Although the operation of the electric motor 33 is stopped when the operation continues for (5 msec) or more, the first operation detection switch SW1 is turned off in the state where the neutral state detecting means is detecting and operating instead of such a configuration. When the state is detected, the operation of the electric motor 33 may be immediately stopped without a time delay.

(2) In the above embodiment, the time from the detection of the OFF state of the first operation detection switch SW1 to the elapse of the set time is measured, but it may be configured as follows. . The first operation detection switch SW is set at a preset time (for example, 5 ms) asynchronously with respect to the main control routine such as the operation control of the electric motor as described above.
If the neutral state detecting means does not detect the neutral state, the OFF state of the first operation detection switch SW1 is, for example, 8 times in succession in the subsequent sampling process. Is detected (and therefore lasts up to 40 ms),
When the operation of the electric motor 33 is stopped and the neutral state detecting means detects the neutral state, when the OFF state of the first operation detection switch SW1 is detected in the subsequent sampling process, the electric motor 33 is immediately stopped. The time until the operation of the electric motor is stopped may be changed depending on the difference in the number of samplings, such as the operation is stopped.

(3) In the above embodiment, the control device detects the running neutral state based on the detection information of the vehicle speed sensor. However, instead of such a configuration, the gear shift lever corresponds to the running neutral state. The neutral state detecting means may be configured so that a switch such as a limit switch detects that the switch has been operated to a position close to or close to that position.

(4) In the above embodiment, the operating speed of the electric motor is set to be higher as the operation load on the shift lever is larger. However, instead of such a configuration, the operating speed of the electric motor is always constant. It may be configured to allow it.
Further, in the above embodiment, by operating the speed change lever from the neutral position in the forward and reverse operation directions, the forward speed increasing operation, or
Although the reverse speed increasing operation is performed, the speed increasing operation of the continuously variable transmission is simply performed by a predetermined direction operation, and the deceleration operation is performed by an opposite direction operation. May be

(5) In the above embodiment, the operation state detecting means of the shift lever 30 is constituted by a pair of switches. However, the strain amount sensor may be replaced by a switch having such a switch. Based on the detection information of 47, when the operation load applied to the shift lever 30 exceeds the set lower limit value, it may be determined to be in the operation state.

(6) In the above embodiment, the belt type continuously variable transmission is exemplified as the continuously variable transmission, but the invention is not limited to this, and the forward and reverse operation is performed based on the manual operation of the speed change operation tool. The present invention can be applied to other continuously variable transmissions such as a gear shift operation unit of a hydrostatic continuously variable transmission, for example, as long as it is operated and the operation is assisted by the drive operation means.

(7) In the above embodiment, the electric motor is used as the driving operation means, but a hydraulic motor or a driving mechanism using the driving force of the engine may be used.

(8) In the above-described embodiment, the case where the receiving restricting portion k of the speed change lever 30 is constituted by the inner edge of the stepped guide groove has been exemplified, but instead of such a constitution, it is simply contacted. It may be configured to receive and regulate with one piece.

It should be noted that reference numerals are added to the claims to facilitate the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view showing a shift operation configuration.

FIG. 2 is a sectional view of a continuously variable transmission.

[Fig. 3] Combined transmission system diagram

FIG. 4 is a diagram showing a cam type gear shift operation mechanism.

FIG. 5 is a diagram showing a lever guide.

FIG. 6 is a cutaway perspective view of a detection switch.

FIG. 7 is a control block diagram.

FIG. 8 is a diagram showing vehicle speed change characteristics.

FIG. 9 is a flowchart of control operation

FIG. 10 is a flowchart of control operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 continuously variable transmission device 14 operated part 30 gear change operation device 33 drive operation means 40 operation state detection means 45 gear change control means 49 vehicle speed detection means k receiving restriction section TU neutral state detection means

Claims (5)

[Claims] 1. A speed change tool (30) which can be manually operated in forward and reverse directions and an operated part (14) which is movable in forward and reverse directions in a vehicle body continuously variable transmission (10) are mechanically operated. When the gear shift operation tool (30) is decelerated to a running neutral state by being linked through a linkage mechanism, a receiving restriction portion (15) for receiving and limiting the gear change operating tool (30) at a position corresponding to the running neutral state. k) is provided, and drive operation means (3) for moving the operated part (30).
3), an operation state detection means (40) for detecting whether or not the speed change operation tool (30) is in an operation state where it is manually operated, and an operation direction in the operation state, and the operation state detection means. A traveling transmission device comprising: a shift control means (45) for controlling the operation of the drive operation means (33) based on the detection result of (40), wherein the traveling transmission is in a neutral state or a state close thereto. Neutral state detection means (TU) for detecting whether or not there is is provided, the shift control means (45), in a state in which the neutral state detection means (TU) is not detecting operation, the operation state detection means (TU) 40) detects that it is not in the operating state, and when the detected state continues for a set time, it is configured to stop the operation of the drive operating means (33), and the neutral state detecting means (TU) detects In the moving state, immediately after the operation state detecting means (40) detects that it is not in the operation state, or when the detected state continues for a time shorter than the set time, the drive operation means (33). ), The traveling transmission configured to stop the operation of. 2. The traveling transmission apparatus according to claim 1, wherein the neutral state detecting means (TU) is composed of a switch that is detected and operated based on an operation position of the shift operation tool (30). 3. The neutral state detecting means (TU) detects whether or not the vehicle is in the neutral state or in a state close to the neutral state, based on detection information of a vehicle speed detecting means (49) for detecting a vehicle traveling speed. The traveling transmission according to claim 1, which is configured as described above. 4. The traveling transmission according to claim 1, 2 or 3, wherein the drive operating means (33) is composed of an electric motor. 5. A pair of operation state detection means (40) for detecting the operation state and its operation direction based on the relative displacement between the speed change operation tool (30) and the operated portion (14). 5. The traveling transmission device according to claim 1, wherein the traveling transmission device is composed of switches (SW1) and (SW2).