JPH08178062A - Belt type continuously variable transmission for travel - Google Patents

Abstract

PURPOSE: To directly conduct a speed change action with an operation lever as required by constituting a cam type operation mechanism changing the split width interval of a split pulley with two channels of an assist operation system operated by an assist mechanism and a manual operation system directly operated by an operation lever. CONSTITUTION: An assist mechanism A contains an actuator Am operating a cam type operation mechanism 15 changing the split width interval of a split pulley 13 based on the detection information of an operating direction detecting means As detecting the operating direction of an operation lever 21. A forward side clutch or a reverse side clutch is connected via the forward action or reverse action of the operation lever 21 from the neutral position. The cam type operation mechanism 15 is constituted of two channels of an assist operation system operated by the assist mechanism A and a manual operation system directly operated by the operation lever 21 preferentially to the assist mechanism A, and the individual operation systems are constituted of cam members 15A, 15B having V-shaped guide cam faces 15a, 15b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating direction detecting means for detecting the operating direction of an operating lever for switching between forward and backward movements, and a dividing width interval of a split pulley based on detection information from the operating direction detecting means. A belt type vehicle for traveling which is provided with an assist mechanism including an actuator for operating a cam type operating mechanism to be changed, and which is operated to change speed from the neutral position of the operating lever in the forward and reverse directions to the speed increasing side. The present invention relates to a speed change device.

[0002]

2. Description of the Related Art A belt type continuously variable transmission is provided with a biasing means for maintaining a transmission belt in the belt type continuously variable transmission in a tensioned state. The operation load when operating the belt-type continuously variable transmission is considerably large. Therefore, in the traveling belt type continuously variable transmission as described above, operation direction detecting means for detecting the operation direction of the operation lever in accordance with the lever operation when performing the gear shift operation of the belt type continuously variable transmission, While the detection is continued, the operating direction detecting means is provided with an assist mechanism including an actuator that operates the cam type operating mechanism to change the split width interval of the split pulley in the belt type continuously variable transmission. There is a type in which the gear shifting operation of the belt type continuously variable transmission can be performed with an operating force that only detects the operating direction of the operating lever.

Conventionally, a cam type operating mechanism in the belt type continuously variable transmission as described above is disclosed in, for example, Japanese Patent Laid-Open No. 6-201.
As disclosed in Japanese Patent Application Laid-Open No. 007 or Japanese Patent Application Laid-Open No. 6-201039, it is configured as one system of an assist operation system operated by an assist mechanism.

[0004]

However, when the cam type operating mechanism is constructed as one system of the assist operating system as described above, the cam type operating mechanism is always operated by the operation of the actuator. It is impossible to operate the cam type operation mechanism with the operation lever at a speed faster than the operation speed of the actuator of the above, and the belt type continuously variable speed is faster than the normal constant speed shift operation by the operation of the actuator. There has been a problem that the gear shift operation of the device cannot be performed as necessary. Also, if an actuator failure occurs,
Unless the actuator is repaired or replaced, the belt type continuously variable transmission cannot be operated for gear shifting.

An object of the present invention is to enable a gear shifting operation of a belt type continuously variable transmission with an operating force that is usually sufficient to detect the operating direction of an operating lever by an operating direction detecting means, but if necessary, It is intended to enable a direct gear shift operation of a belt type continuously variable transmission by an operation lever.

[0006]

In order to achieve the above object, according to the present invention, an operation direction detecting means for detecting an operation direction of an operation lever for switching between forward and backward movements, and detection information from the operation direction detecting means are used. And an assist mechanism consisting of an actuator for operating a cam type operation mechanism for changing the split width interval of the split pulley, and shifting to the speed-increasing side by operating the operating lever in the forward and reverse directions from the neutral position. In the operated belt type continuously variable transmission, the cam type operation mechanism is directly operated by an assist operation system operated by the assist mechanism and the operation lever in preference to the assist mechanism. It is composed of two systems of a manual operation system, and each of the operation systems is
The cam member is formed with a V-shaped guide cam surface.

[0007]

According to the present invention, as the operation lever is operated,
The operation direction of the operation lever is detected by the operation direction detecting means, and the assist operation system of the cam type operation mechanism is operated by the operation of the actuator based on the detected information, and the manual operation system of the cam type operation mechanism is operated by the operation lever. It will be operated directly. At this time, if the operating speed of the operating lever is made to match the operating speed of the actuator, the assist operating system of the cam type operating mechanism will be operated with priority over the manual operating system, and the split pulley is driven by the power from the actuator. You can now change the split width interval. That is, the shift operation of the belt-type continuously variable transmission can be performed with an operation force that only detects the operation direction of the operation lever by the operation direction detection means. On the other hand, if the operating speed of the operating lever is faster than the operating speed of the actuator, the manual operating system of the cam type operating mechanism will be operated with priority over the assist operating system, and it will be directly divided by the operating force of the operating lever. You can change the split width of the pulley. That is, the direct operation of the cam type operation mechanism by the operation lever enables the speed change operation of the belt type continuously variable transmission faster than the normal operation speed by the actuator. Further, even if a failure of the actuator occurs, the shift operation of the belt type continuously variable transmission can be performed by directly operating the cam type operating mechanism by the operating lever.

By the way, as shown in FIG. 6, the assist operation system of the cam type operation mechanism 15 is operated by pushing the movable pulley body 13B of the split pulley 13 in the direction against the bias of the biasing means by the operation of the actuator Am. Shift fork 1
A 5D configuration is also conceivable. However, the belt-type continuously variable transmission according to the present invention is for traveling, in which the forward / reverse switching operation lever is operated in the forward direction and the reverse direction from the neutral position to perform a speed change operation. Therefore, when the assist operation system of the cam type operation mechanism is configured by the shift fork as described above, it is necessary to reverse the operating direction of the actuator in conjunction with the forward / reverse switching operation by the operation lever. , For example, a linkage mechanism including a detection unit that detects switching between forward and backward movements of the operation lever and a control unit that reverses the operating direction of the actuator based on the detection information from the detection unit is required, which reduces the manufacturing cost. Inconvenience will increase. Therefore, in the present invention, the assist operation system in the cam type operation mechanism is configured by a cam member having a V-shaped guide cam surface together with the manual operation system, and is interlocked with the forward / backward switching operation by the operation lever. This eliminates the need to reverse the operating direction of the actuator. This makes it possible to avoid the disadvantage that the manufacturing cost increases due to the provision of the linkage mechanism.

[0009]

As described above, according to the present invention, the belt type continuously variable transmission is normally operated with an operating force for detecting the operating direction of the operating lever by the operating direction detecting means while reducing the manufacturing cost. When a speed change operation can be performed and a speed change operation needs to be performed quickly, by operating the cam type operation mechanism directly with priority over the assist mechanism with the operation lever, the speed can be faster than the normal operation speed by the actuator. The belt type continuously variable transmission can now be operated. Further, in the event of a failure of the actuator, as a first-aid measure, it becomes possible to directly perform a gear shift operation of the belt type continuously variable transmission by the operation lever.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a combine will be described below with reference to the drawings.

FIG. 1 shows a combine traveling system. This traveling system is configured to transmit power from the engine 1 to the left and right crawler traveling devices 5 via a belt tension type clutch mechanism 2, a belt type continuously variable transmission 3, and a mission case 4. Has been done. Inside the mission case 4, a hydraulically operated forward clutch 6 that expresses a forward traveling state of the crawler type traveling device 5, a hydraulically operated backward clutch 7 that shows a reverse traveling state of the crawler type traveling device 5, Auxiliary transmission 8 configured to switch the traveling speed of the crawler type traveling device 5 to three stages of high, middle and low, and left and right hydraulically operated side clutches 9 that independently discontinue transmission to the left and right crawler type traveling devices 5, respectively. ,
Also, the left and right hydraulically operated brake mechanisms 1 that independently apply the braking action to the left and right crawler type traveling devices 5, respectively.
0, etc. are deployed.

As shown in FIG. 2, the belt type continuously variable transmission 3 includes an input shaft 11 to which power from the engine 1 is input,
The output shaft 12 that outputs the power from the engine 1 to the transmission case 4, the split pulleys 13 mounted on the input shaft 11 and the output shaft 12, and the transmission belt 14 wound around the split pulleys 13. , And so on. The split pulley 13 mounted on the input shaft 11 functions as a drive pulley 3A in the belt type continuously variable transmission 3. The split pulley 13 mounted on the output shaft 12 functions as a driven pulley 3B in the belt type continuously variable transmission 3. Each of the split pulleys 13 has a fixed pulley body 13A that is integrally and rotatably fixed to each of the input shaft 11 and the output shaft 12, and
The input shaft 11 and the output shaft 12 are integrally rotatable with each other, and the axis P1 of each of the input shaft 11 and the output shaft 12 is provided.
The movable pulley body 13B is slidably fitted in the P2 direction. The input shaft 11 includes a movable pulley body 13 of a split pulley 13 that functions as a drive pulley 3A.
A cam type operation mechanism 15 for slidingly operating B in the direction of the axis P1 is attached. A biasing means 16 for biasing the movable pulley body 13B of the split pulley 13 functioning as the driven pulley 3B toward the fixed pulley body 13A along the axis P2 is attached to the output shaft 12. That is, the cam type operation mechanism 15 and the biasing means 16 maintain the transmission belt 14 in the belt type continuously variable transmission 3 in a tensioned state, and the operation of the cam type operation mechanism 15 divides the drive pulley 3A and the driven pulley 3B. Changing the width interval in a contradictory manner, drive pulley 3
The winding ratio of the transmission belt 14 with respect to each of A and the driven pulley 3B can be changed.

By the way, the urging means 16 is the driven pulley 3
The coil spring 16A that constantly presses the movable pulley body 13B of B to the fixed pulley body 13A side, and the output shaft 12 and the movable pulley body 13B of the driven pulley 3B are integrally and rotatably linked together, and the movable pulley body is in that rotating state. Cam mechanism 16 for pressing the body 13B toward the fixed pulley body 13A
It is composed of B. The cam mechanism 16B is integrally formed on the movable pulley body 13B and a pressing cam body 16a which is spline-fitted to the output shaft 12 so as to be able to rotate integrally, and which has a pressing inclined surface for pressing the movable pulley body 13B. And a pressed cam body 16b formed with a pressed inclined surface that comes into surface contact with the pressing inclined surface, and the pressing inclined surface and the pressed inclined surface make surface contact with the rotation of the output shaft 12. , The axis P of the pressing cam body 16a
When the pressed cam body 16b receives a pressing force around 2, the output shaft 12 and the movable pulley body 13B are integrally rotated, and the pressed cam body 16b generated between the pressed inclined surface and the pressed inclined surface. The movable pulley body 13B is urged toward the fixed pulley body 13A by the component force that pushes in the direction of the axis P2.

As shown in FIGS. 2 to 4, the cam type operating mechanism 15 is rotatable relative to the first cam member 15A and the first cam member 15A pivotally supported by the input shaft 11 so as to be rotatable relative thereto. The second cam member 15B pivotally supported and the movable pulley body 13B of the drive pulley 3A are rotatable relative to each other and the input shaft 1
The shift member 15C is integrally pivotally supported in the direction of the axis P1. First cam member 15A
Each of the second cam member 15B and the second cam member 15B is provided with a V-shaped guide cam surface 15a, 15b for inclining and guiding toward the shift member 15C. The shift member 15C is provided with one of the guide cam surfaces 15a, 15a in association with the turning operation of the first cam member 15A or the second cam member 15B.
A pair of guided pins 15c, which are guided by b and are slidably guided in a pair of guide grooves 17a formed in the transmission case 17, are provided in a protruding manner. The guided pin 15c is slidably guided in the guide groove 17a so that the shift member 15C is prevented from rotating. One end of the second cam member 15B projects outward from the transmission case 17. One end of the first cam member 15A is
The second cam member 15B is configured to further project outward from the projecting end. A boss member 18 is integrally rotatably connected to the protruding end of the first cam member 15A. Boss member 1
An operation plate 19 is integrally rotatably fixed to the operation plate 8, and a pair of operation pieces 19a, 19 provided on the operation plate 19 is provided.
An operation lever 21 for rotating the operation plate 19 is pivotally supported via either one of b. When the operating lever 21 is in the neutral position N, the cam type operating mechanism 1
5, the guided pin 15c of the shift member 15C is located at the bottom of each V-shaped guide cam surface 15a, 15b formed on each of the first cam member 15A and the second cam member 15B, and the drive pulley 3A The split width interval between the fixed pulley body 13A and the movable pulley body 13B is set so as to be in the maximum separated state. That is, when the operation lever 21 is located at the neutral position N, the winding ratio of the transmission belt 14 with respect to each of the drive pulley 3A and the driven pulley 3B in the belt type continuously variable transmission 3 appears to be the lowest speed state. Is set to. In addition, the operation lever 21
By rotating the neutral position N around the axis P1 in the forward direction F and the reverse direction R, the guide pin 15c of the shift member 15C is moved by the guide cam surface 15a of the first cam member 15A of the cam type operation mechanism 15. You will be guided up,
In the belt type continuously variable transmission device 3, the winding ratio of the transmission belt 14 to each of the drive pulley 3A and the driven pulley 3B is changed to the speed increasing side. That is, the first cam member 15A functions as a manual operation system in the cam type operation mechanism 15.

As shown in FIGS. 4 and 5, the operating lever 2
Reference numeral 1 denotes an operation lever 21 that is interlocked with a switching valve 22 that switches the flow state of hydraulic oil to the forward clutch 6 and the reverse clutch 7 via a push-pull wire 23.
Positive direction (forward direction) F around the axis P1 from the neutral position N
The switching valve 22 is connected to the forward clutch 6 in conjunction with the turning operation to
Is switched to the state in which hydraulic oil is supplied and the forward clutch 6 is switched to the on state, whereby the forward traveling state of the crawler type traveling device 5 is revealed. Further, the switching valve 22 is switched to a state in which hydraulic oil is supplied to the reverse clutch 7 in conjunction with a turning operation from the neutral position N of the operation lever 21 in the reverse direction (reverse direction) R around the axis P1. At the same time, the reverse clutch 7 is switched to the engaged state so that the reverse running state of the crawler type traveling device 5 is revealed. At the neutral position N of the operation lever 21, the switching valve 22 is switched to a state in which hydraulic oil is discharged from each of the forward clutch 6 and the reverse clutch 7, and the forward clutch 6 and the reverse clutch 7 are switched to the disengaged state, thereby the crawler type. The power from the engine 1 to the traveling device 5 is cut off.
Incidentally, reference numeral 24 shown in FIG. 5 indicates the operation lever 21 and the switching valve 2.
The switching valve 22 of the operating lever 21
This is a flexible mechanism that allows an operation of more than the operation amount for switching the operating state of.

With the above construction, by operating the operating lever 21 from the neutral position N in the forward direction F about the axis P1, the forward traveling state of the crawler type traveling device 5 can be brought out and the operating lever can be displayed. The forward speed of the crawler type traveling device 5 can be changed steplessly by changing the turning operation amount of 21 in the forward direction F. Further, by operating the operation lever 21 from the neutral position N in the reverse direction R around the shaft center P1, the reverse traveling state of the crawler type traveling device 5 can be revealed, and
By changing the amount of rotation of the operating lever 21 in the reverse direction R, the reverse speed of the crawler type traveling device 5 can be changed steplessly.

As described above, the belt type continuously variable transmission 3
Is provided with urging means 16 for urging the movable pulley body 13B of the driven pulley 3B toward the fixed pulley body 13A. Therefore, the operation load applied to the operation lever 21 when operating the belt type continuously variable transmission 3 to the speed increasing side is considerably heavy. On the other hand, the operation load applied to the operation lever 21 when the belt type continuously variable transmission 3 is operated to the deceleration side is considerably light. Therefore, the belt type continuously variable transmission 3
Is provided with an assist mechanism A that reduces an operation load applied to the operation lever 21 when the belt type continuously variable transmission 3 is operated to the speed increasing side.

As shown in FIGS. 2 and 4, the assist mechanism A has a cam type operation based on operation direction detection means As for detecting the operation direction of the operation lever 21 and detection information from the operation direction detection means As. The second cam member 15B of the mechanism 15 is configured by a motor Am that is an example of an actuator that operates via the pinion gear 25 and the sector gear 26. The second cam member 15B of the cam type operation mechanism 15 and the sector gear 26 are integrally rotatably connected. The operation direction detecting means As is one operation piece 19 of the operation plate 19.
First limit switch s1 installed on a, operation plate 19
Of the second limit switch s2 installed on the other operation piece 19b, and a control device C for controlling the operation of the motor Am based on the output signals from the first limit switch s1 and the second limit switch s2. There is. The motor Am is equipped with a worm gear type reduction mechanism wg. The first limit switch s1 is configured to output an ON signal to the control device C when the operating lever 21 is rotated in the forward direction F. The second limit switch s2 is configured to output an ON signal to the control device C in accordance with the turning operation of the operation lever 21 in the reverse direction R. The controller C uses the O from the first limit switch s1.
The motor Am is normally operated only when the N signal is input, and the motor Am is reversely operated only when the ON signal from the second limit switch s2 is input. Incidentally, the operation lever 21 is restrained from freely swinging around the axis P1 with respect to the boss member 18 by the bias of the spring 21a provided at the base of the operation lever 21. Spring 21a
Is locked by a locking tool 19c provided on the operation plate 19 so as to rotate integrally with the operation plate 19.

That is, in a state in which the operation lever 21 is located in the forward shift operation region on the forward direction F side from the neutral position N shown in FIG. 4, and the ON signal from the first limit switch s1 is input, The control device C uses the motor Am
The second cam member 1 of the cam type operation mechanism 15 by operating the
By rotating 5B in the forward direction F, the shift member 15C of the cam type operation mechanism 15 slides toward the fixed pulley body 13A side together with the movable pulley body 13B of the drive pulley 3A against the bias of the biasing means 16. It is designed to be operated.
Further, when the ON signal is input from the second limit switch s2, the motor Am is operated in the reverse direction to rotate the second cam member 15B of the cam type operation mechanism 15 in the reverse direction R. The shift member 15C of the operating mechanism 15 is driven by the biasing means 16 to drive the drive pulley 3
Along with the movable pulley body 13B of A, it is slid on the side away from the fixed pulley body 13A. on the other hand,
In a state where the operation lever 21 is located in the reverse shift operation area on the reverse direction R side from the neutral position N shown in FIG. 4, and the ON signal is input from the first limit switch s1, the control device C By rotating the second cam member 15B of the cam type operation mechanism 15 in the forward direction F by operating the motor Am in the normal direction, the shift member 15C of the cam type operation mechanism 15 is driven by the biasing means 16 to drive the pulley. Along with the movable pulley body 13B of 3A, it is slid on the side away from the fixed pulley body 13A. Further, when the ON signal is input from the second limit switch s2, the motor Am is operated in the reverse direction to rotate the second cam member 15B of the cam type operation mechanism 15 in the reverse direction R. Shift member 15C of operation mechanism 15
Against the urging force of the urging means 16, the movable pulley body 13B of the drive pulley 3A and the fixed pulley body 13A are slid. The shift member 15C of the cam type operation mechanism 15 is driven by the biasing means 16 to drive the drive pulley 3A.
When the sliding operation is performed together with the movable pulley body 13B on the side away from the fixed pulley body 13A, as the shift member 15C slides on the side away from the fixed pulley body 13A, the first operation of the cam type operation mechanism 15 is performed. One cam member 15A is adapted to be rotated around the axis P1. That is, the second cam member 15B functions as an assist operation system in the cam type operation mechanism 15.

With the above construction, the second cam member 15B as the assist operation system of the cam type operation mechanism 15 is made to match the operation speed of the operation lever 21 with the operation speed of the motor Am, and the second cam member 15B as the manual operation system. One cam member 1
The shift member 15C is operated in preference to 5A, and the split width interval of the split pulley 13 can be changed by the power from the motor Am. That is, the operation lever 2
1, the first limit switch s1 or the second limit switch s2 of the operation direction detecting means As is turned on, and the control device C of the operation direction detecting means As detects the operation direction of the operation lever 21. The belt type continuously variable transmission 3 can be operated to change gears.

On the other hand, by making the operating speed of the operating lever 21 faster than the operating speed of the operation of the motor Am, the first operating direction of the cam type operating mechanism 15 as the manual operating system in the speed-up operating direction of the operating lever 21 is increased. Cam member 15A
However, the shift member 15C is operated in preference to the second cam member 15B as the assist operation system, and the split width interval of the split pulley 13 on the drive pulley 3A side is directly narrowed by the operating force of the operating lever 21. Will be able to change to the side. Further, in the deceleration operation direction of the operation lever 21,
The first cam member 15A as a manual operation system is operated by the operation lever 21, and the shift member 15C is energized by the energizing means 16.
The biasing means 1 can be operated prior to the sliding operation of
The operation load generated when changing the split width interval of the split pulley 13 on the drive pulley 3A side by the bias of 6 is
Along with the sliding operation of the shift member 15C, the first cam member 15
It can be reduced by the amount of rotating A. That is, in the speed increasing operation direction of the operation lever 21, the speed increasing operation of the belt type continuously variable transmission 3 faster than the normal operation speed by the motor Am can be performed according to the operation speed of the operation lever 21. ing. Further, in the deceleration operation direction of the operation lever 21, the belt-type continuously variable transmission 3 is faster than the normal operation speed by the motor Am because the operation load for the urging of the urging means 16 is reduced.
The deceleration operation of can be performed. Further, in the deceleration operation direction of the operation lever 21, the operation lever 21 can be operated to the neutral position N prior to the sliding operation of the shift member 15C by the urging of the urging means 16, and by this operation, the crawler is operated. The traveling device 5 can be stopped suddenly.

[Other Embodiments] Other embodiments of the present invention will be listed below. In the above embodiments, the present invention is applied to a combine, but the present invention is not limited to this, and may be applied to another work vehicle such as a harvester. The belt type continuously variable transmission 3 includes a drive pulley 3A.
Only one of the driven pulley 3B and the driven pulley 3B is the split pulley 13.
It may be configured by. The belt type continuously variable transmission 3 may be configured such that the driving pulley 3A side is provided with the biasing means 16 and the driven pulley 3B side is provided with an operation system such as a cam type operation mechanism 15. In this case, the operating force of the operating lever 21 can be directly changed to the side where the split width interval of the split pulley 13 on the driven pulley 3B side is narrowed, and the belt type stepless speed faster than the normal operating speed by the motor Am. Transmission 3
The deceleration operation can be performed according to the operation speed of the operation lever 21. In the above embodiment, when the operation speed of the operation lever 21 is set higher than the operation speed of the operation of the motor Am, the second cam member (assist operation system) is in phase with the first cam member (manual operation system) 15A. The first limit switch s1 or the second limit switch s of the operation direction detecting means As is operated by the operation lever 21 until the phases of 15B coincide.
It is necessary to turn 2 on. Therefore, the operating lever 21
And a second cam member 15B are provided with a potentiometer for detecting a relative rotational displacement between the operation lever 21 and the second cam member 15B, which is detected by the potentiometer (first cam member 15A and first cam member 15A). Two cam member 1
If the motor Am is operated until the phase of the second cam member 15B matches the phase of the first cam member 15A, the operation lever 21 operates the first limit switch s1 or the first limit switch s1 until the phase of the second cam member 15B matches. It is possible to eliminate the need to turn on the second limit switch s2.
In this case, the operation lever 21 is adjusted by the potentiometer.
Since it is possible to discriminate the operation direction of, the potentiometer can function as the operation direction detecting means As in place of the first limit switch s1 and the second limit switch s2.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a traveling system of a combine.

FIG. 2 is a vertical sectional rear view of the belt type continuously variable transmission.

FIG. 3 is a plan view of a cam type operation mechanism.

FIG. 4 is a left side view of a belt type continuously variable transmission.

FIG. 5 is a linkage diagram showing the linkage between the operation lever and the forward clutch and the reverse clutch.

FIG. 6 is a vertical sectional rear view of a belt type continuously variable transmission according to a comparative example.

[Explanation of symbols]

 13 Split pulley 15 Cam type operation mechanism 15A Cam member 15B Cam member 15a Guide cam surface 15b Guide cam surface 21 Operation lever A Assist mechanism Am Actuator As Operation direction detection means F Forward direction R Reverse direction

Claims (1)

[Claims] 1. An operating lever (21) for switching between forward and backward movement.
Based on the operation direction detection means (As) for detecting the operation direction of the, and the detection information from the operation direction detection means (As),
An assist mechanism (A) including an actuator (Am) for operating a cam type operation mechanism (15) for changing the split width interval of the split pulley (13) is provided, and the operation lever (21) is moved forward from the neutral position. A belt-type continuously variable transmission for traveling, which is operated to shift to an accelerating side by an operation in a direction (F) and a reverse direction (R), wherein the cam type operation mechanism (15) is provided in the assist mechanism (A). ) And a manual operation system directly operated by the operation lever (21) in preference to the assist mechanism (A), and each of the operation systems. To the V-shaped guide cam surface (15
a), (15b) formed cam member (15A),
(15B) a belt type continuously variable transmission for traveling configured.