JPH10272942A - Shift operating device of vehicle with continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make improvements in accuracy of operability, abrasion resistance and shift control upon reducing an extent of rotational abrasion, and also to aim at the promotion of structural simplification and miniaturization, in this shift operating device of a vehicle with a continuously variable transmission. SOLUTION: In a shift operating device 30 of a continuously variable transmission geared vehicle equipped with a travel device, a power source, and a continuously variable transmittion to transmit power from this power source to the travel device, this shift operating device 30 is equipped with a first variable member 32 to be rotated by an operation of a speed changeover operating member 10, and a second variable member 35 being connected to a shift manipulated variable inputting part of the continously variable transmission directly or indirectly via a transmitting means 33 and making a speed of the continuously variable transmission change variable, and in this constitution, a first rotative support shaft 31 being rotatably pivoted to the first variable member 32 and a second rotative support shaft 34 rotatably pivoted to the second variable member 35 both are set up in parallel with each other, while both these first and second bearable members 32 and 25 are connected to each other free of detachment so as to make the turning effort be transmitted to the second variable member 35 from the first variable member 32 and the second variable member 35 rotatable independently even it is alone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift operation device for a vehicle equipped with a continuously variable transmission for driving crawler tracks and wheels, for example, a crawler-type carrier, a construction machine with a track, a cultivator, a snowmobile, and the like. In particular, the present invention relates to this type of speed change operation device having a simple structure, good operability, and good running and turning characteristics of a vehicle.

[0002]

2. Description of the Related Art In vehicles such as a crawler-type carrier equipped with left and right crawler tracks, a construction machine with caterpillars, a cultivator, a snowmobile, and the like, when the running direction is changed, the left and right crawler tracks rotate. It was necessary to continuously change the speed. JP-A-9-30278 (see FIG. 9) and JP-A-7-323 respond to such a request.
There is a shift operating device described in Japanese Patent Application Laid-Open No. 864, Japanese Patent Application Laid-Open No. 7-305442, and the like.

However, these conventional shift operating devices have complicated structures, and a plurality of variable members such as a link, a lever, and a plate constituting the shift operating device are pivotally supported. The plurality of turning support shafts are complicatedly three-dimensionally intersected, and many portions cause turning wear, and are slightly inferior in operability and wear resistance. In addition, when a plurality of rotation support shafts intersect in a three-dimensional manner in a complicated manner, the portions of the links, levers, plates, etc., which are pivotally supported by these rotation support shafts, increase the amount of rattling, and the speed change control. In addition to the deterioration of the accuracy, the size of the apparatus was also increased.

This will be described with reference to FIG. 9. When a change lever 010 for setting a vehicle speed and a traveling direction is turned,
The movement is performed by the rotating shaft 01 via the rod 012 and the arm 011.
3 and a mixing lever 01 that is swingably supported on the bracket 014 in a plane parallel to the plane of the drawing at the position of the pivot pin 015.
6 is swung in a plane perpendicular to the plane of the drawing.

On the other hand, when a steering wheel (not shown) is steered, for example, to the right, the movement is
Through the base member 018, a guide member 020 having a U-shaped cross section, which is swingably supported in a plane parallel to the paper surface at two pivots 019 at the front and rear (in the direction perpendicular to the paper surface), is moved rightward. Rock it. When the guide groove 020a formed in the ceiling plate of the guide member 020 comes into contact with the mixing lever 016, the mixing lever
Swing 6 to the right.

[0006] As described above, the mixing lever 016 has both the operation amount related to the vehicle speed and the traveling direction (forward and backward) due to the rotation of the change lever 010 and the operation amount related to the turning direction due to the steering of the steering wheel. Upon receiving the operation amount, the two operation amounts are combined, and the swing is stopped at a position corresponding to the combined operation amount.

During this time, the push-pull rods 022l, 022r pivotally supported on the left and right of the mixing lever 016 by the inner ball joints 021, 021 are rotatably connected to each other at the positions of the outer ball joints 023, 023. The control arms 024l, 024r are rotated around pivots 026, 026 erected on the support plate 025. Then, the rotation of the mixing lever 016 is stopped at a position corresponding to the stop position.

One end of each of the push-pull rods 028l and 028r is rotatably connected to the intermediate portion of the control arms 024l and 024r at the position of the front ball joints 027 and 027, and the other ends of the push-pull rods 028l and 028r. Are connected to the swash plate swing shafts (not shown) of the left and right hydrostatic continuously variable transmissions, so that the left and right swash plate swing shafts stop rotating the control arms 024l and 024r. As a result, the vehicle is shifted so that the inner wheels are slower and the outer wheels are faster in the right turning direction.

As described above, in the present speed change operation device,
Bracket 014, mixing lever 016, guide member 02
0, a rotating shaft 013 for pivotally supporting or supporting many variable members such as push-pull rods 022l, 022r, control arms 024l, 024r, a pivot pin 015, a pivot 01
9, the inner ball joints 021, 021, the outer ball joints 023, 023, the pivots 026, 026, the front ball joints 027, 027, etc. The dynamic support shafts intersect three-dimensionally in a complicated manner, and in each part, rotational wear, swinging of the variable member, and rattling of rotation occur. For this reason,
The operability, abrasion resistance, and control accuracy of the speed change operation device were slightly inferior. In addition, the size of the device was also increased.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a shift operation device for a vehicle with a continuously variable transmission which overcomes the above-mentioned drawbacks. , A power source, and a continuously variable transmission for transmitting power from the power source to the traveling device, wherein the speed change operation device is operated by operating a speed switching operation member. And a second variable member which is connected directly or indirectly via a transmission means to a shift operation amount input portion of the continuously variable transmission and varies the speed of the continuously variable transmission. A first rotation support shaft rotatably supporting the first variable member, and a second rotation support shaft rotatably supporting the second variable member. Are arranged in parallel, and the first variable member and the second variable member With a continuously variable transmission characterized in that it is detachably connected so that rotational power is transmitted from the first variable member to the second variable member and the second variable member can be independently rotated independently. 2 is a shift operation device of a vehicle.

[0011] The invention described in claim 1 is configured as described above.
And the second variable member rotate in the same direction, and the first and second rotation support shafts do not intersect. Therefore, the number of rotation support shafts can be reduced, Wear can be reduced, and the operability and wear resistance of the speed change operation device are improved.
In addition, since the portion of the link, the lever, the plate, and the like, which is pivotally supported by the rotation support shaft, is reduced, the precision of the shift control is improved. Further, the size of the device can be reduced.

According to the second aspect of the present invention, a pair of left and right traveling devices, a pair of left and right continuously variable transmissions corresponding to these traveling devices, and a speed change operation are provided. The same effect as described above can be obtained in the shift operation device for a vehicle with a continuously variable transmission having the device.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shift operation device according to an embodiment of the present invention described in claims 1 and 2 of the present application shown in FIGS. 1 to 6 will be described below. FIG. 1 is a side view of a crawler-type carrier with a continuously variable transmission to which the speed change device of the present embodiment is applied, FIG. 2 is a rear view thereof, and FIG. 3 is an enlarged view of a main portion of the speed change device. 4 to 6
FIG. 3 is a diagram showing the operating states and operating characteristics thereof, and a hydrostatic continuously variable transmission is used as the continuously variable transmission.

A body 3 of a crawler-type carrier 1 has a carrier 3
An internal combustion engine 4 and a pair of left and right hydrostatic continuously variable transmissions 5 are arranged behind the crawler belt. Crawler belt support wheels 6 are provided on both left and right sides of the vehicle body 2 at required intervals in the front-rear direction. A drive wheel 7 is disposed, and an endless crawler belt 8 is bridged over the crawler belt support wheel 6 and the crawler belt drive wheel 7, respectively. It is to be forwarded. The crawler belt support wheel 6, the crawler belt drive wheel 7, and the crawler belt 8 constitute a traveling device of the vehicle 1.

A handle 9 is integrally mounted on the rear portion of the vehicle body 2 so as to be directed obliquely rearward and upward, and a change lever 10 is provided on the left side of the handle 9 so as to be able to swing back and forth in a change box (not shown). It is pivotally supported, and its tip is connected to the vicinity of the top of each first variable member 32 of a pair of left and right speed change operation devices 30 described later. The pair of left and right speed change operation devices 30 has a board 28 mounted and fixed by bolts and nuts on a mounting plate 27 bridged between the left and right frame pipes 26, 26 below the handle 9.

Further, a drive pulley 12 is fitted integrally with a crankshaft 11 of the internal combustion engine 4 and an input shaft 13 of a hydrostatic continuously variable transmission 5 oriented in a direction parallel to the crankshaft 11.
, A driven pulley 14 is integrally fitted, an endless V-belt 15 is stretched over the drive pulley 12 and the driven pulley 14,
A tension pulley 17 is pivotally supported at the tip of a clutch arm 16 pivotally supported so as to be able to approach or separate from the belt 15.

A tension clutch lever 18 and a loading / unloading lever 19 are pivotally supported at the front of the handle 9 so that the clutch arm 16 swings by operating the tension clutch lever 18 forward. When the endless V-belt 17 is pressed against the endless V-belt 15, the power of the internal combustion engine 4 is transmitted to the hydrostatic continuously variable transmission 5 and the clutch arm is operated by the rearward operation of the tension clutch lever 18. When the tension 16 is swayed in the opposite direction and the tension pulley 17 is separated from the endless V-belt 15, the power of the internal combustion engine 4 is not transmitted to the hydrostatic continuously variable transmission 5.

Although not shown in detail, the hydrostatic type continuously variable transmission 5 includes a pair of left and right swash plate type axial piston pumps which are driven to rotate by the power from the internal combustion engine 4 to generate pressure oil. A pair of right and left swash plate type axial piston motors driven by pressure oil generated by a swash plate type axial piston pump, a trochoid pump for filling a hydraulic circuit with oil, a housing, and a substrate integrally connected to the housing. In FIG. 2, the left input shaft 13 is coaxially connected to the rotation shafts of a pair of left and right swash plate type axial piston pumps. The rotating shafts are arranged in parallel with the rotating shafts of the pair of left and right swash plate type axial piston pumps.

A swash plate swing shaft 20 for variably controlling the amount of pressure oil generated by a pair of left and right swash plate type axial piston pumps.
Are projecting rearward through the housing of the hydrostatic continuously variable transmission 5, and a control arm 21 integrally fixed to the swing shaft 20 is provided with a shift operation device 30 described later.
And the output of the swash plate type axial piston motor is variably controlled, and the rotation of the crawler belt driving wheel 7 directly connected to the output shaft of the motor causes the traverse speed of the crawler belt 8 to rotate. Are variably controlled separately.

Next, the speed change operation device 30 will be described.
As shown in FIG. 3, a pair of shift operating devices 30 are provided on the left and right with substantially the same structure, as shown in FIG. In the following, the structure of the left shift operation device 30 will be mainly described, and finally, the difference between the structures of the left and right shift operation devices 30 will be described.

The speed change operation device 30 includes a plate-shaped first variable member 32 connected to a change lever (speed switching operation member) 10 and rotatably supported around a rotation support shaft (fixed shaft) 31. ,
The swash plate oscillating shaft 20, which is a speed change operation input portion of the continuously variable transmission 5, is connected via a link mechanism 33 and a control arm 21, and is rotatably supported around a rotation support shaft (fixed shaft) 34. And a second variable member 35 having a substantially triangular plate shape. One end of the link mechanism 33 is connected to the lower swinging end of the second variable member 35 in the drawing.

Further, the speed change operation device 30 includes a third variable member 36 and a fourth variable member 37 interposed between the first variable member 32 and the second variable member 35. . The third variable member 36 is rotatably supported by a swing shaft 38 which is implanted in the first variable member 32 and is oriented in the left-right direction, and a coil mounted on the swing shaft 38. The first variable member 32 is constantly urged by a spring 39 so as to abut against a stopper 40 implanted in the first variable member 32, whereby the first variable member 32 is turned by the operation of the change lever 10. When pivoted about the first variable member 32, the pivoting member is integrally rotated with the first variable member 32 when the pivoting cable 41 is pulled by a later-described turning operation cable 41 against the urging force of the coil spring 39. Independently rotatable. A stopper 46 is implanted in the first variable member 32 in order to regulate the maximum value of the independent rotation amount and achieve safe turning of the vehicle.

The fourth variable member 37 is rotatably supported at one end by a swing shaft 42 implanted at the swing end of the third variable member 36, and has a second end at the other end. The variable member 35 is rotatably supported by a swing shaft 43 implanted at the upper swing end in the figure, and transmits the turning force of the third variable member 36 to the second variable member 35. It has been like that.
When the shift operation device 30 is in the neutral position,
The connection part (pivot part by the swing shaft 43) with the variable member 35 of
It is configured to be located concentrically with the swing shaft 38. That is, at this time, the swing shaft 43 and the swing shaft 38 are located on the same axis.

The second variable member 35 is further provided with a first assembly 44 integrally therewith. The first assembly 44 is a cylindrical sleeve fitted on the second rotation support shaft 34 and rotatably supporting the second variable member 35 on the second rotation support shaft 34. 44a, an arm 44b integrally fixed to the cylindrical sleeve 44a at right angles thereto, and a pin fixed to the arm 44b at right angles to the second sleeve 44a and extending in the direction of the second rotation support shaft 34. 44c.

The first assembly 44 is provided integrally with the second variable member 35 of the left shift operating device 30, whereas the first assembly 44 is provided with the second variable member of the right shift operating device 30. Member 35
, A second assembly 45 is integrally provided. The second
The assembly 45 is fitted on the second rotation support shaft 34 and the second
And a cylindrical sleeve 45a for rotatably supporting the variable member 35 on the second rotation support shaft 34. The cylindrical sleeve 45a is integrally fixed to the cylindrical sleeve 45a in a direction orthogonal to the cylindrical sleeve 45a, and the pin is located near one side thereof. A plate-like member 45c having an opening 45b into which 44c can be loosely fitted.
It consists of The opening 45b is formed in a vertically long rectangular shape. The length of this rectangle is
Although not shown, upper and lower bolt holes 45d of the plate-like member 45c are formed.
, 45d so that the side of the opening 45b is parallel to the short side of the rectangle. For this purpose, an elongated hole for bolt insertion is formed in the L-shaped member. This adjustment is performed to adjust the neutral position of the shift operation device 30 on the right side.

The shift operating devices 30 on the left and right sides are provided with the first
The structure is different only in the point of the assembly 44 and the second assembly 45, but they are different from each other.
May be provided in place of the variable member 35.

The other ends of the pair of left and right turning operation cables (turning operation members) 41 are connected to the front right and left ends of a sector gear 24 meshing with a pinion 23 attached to the lower end of the handle shaft 22, respectively. For example, when steered to the right, the pinion 23 rotates clockwise, and the sector gear 24 meshing with the pinion 23 rotates counterclockwise about the rotation shaft 25. Thereby, the right turning operation cable 41 is pulled, and the swing end of the third variable member 36 on the right is turned against the urging force of the coil spring 39. During this time, the third variable member 36 on the left is stationary while being in contact with the stopper 40. The other ends of the pair of left and right turning operation cables 41 are connected to the front right and left ends of the sector gear 24, respectively, and then the turning shaft 25 mounting bracket 25a.
Are connected to the swinging ends of the left and right third variable members 36 via cable support portions (not shown) attached to the front right and left lower ends.

Since the shift operation device of the present embodiment is configured as described above, it operates as follows. First, when the change lever 10 is tilted forward, the pair of left and right first variable members 32 is rotated counterclockwise (leftward) in the figure around the rotation support shaft 31, and in conjunction with this, the pair of left and right The third
, A pair of left and right fourth variable members 37, and a pair of left and right second variable members 35 are similarly rotated left and right, and a pair of left and right swash plate swings via the link mechanism 33 and the control arm 21. The shaft 20 is swung with respect to the pump rotation axis from a neutral position where the tilt is zero to a predetermined tilt position on the vehicle forward side. Thereby, the vehicle 1 moves straight ahead at a predetermined speed.

Depending on whether the amount by which the change lever 10 is tilted forward is intermediate or maximum, the vehicle 1 moves at a predetermined medium speed,
Go forward at high speed. When the change lever 10 is tilted backward, the vehicle 1 moves backward at a predetermined speed. The swinging (rotating) state of each of the variable members 32, 36, 37, 35 during this time is shown in FIG.
This is illustrated in FIG.

As is clear from FIG. 4A, the rotation directions of the first variable member 32 and the second variable member 35 are always reversed. Further, the swinging shaft 38 and the swinging shaft 43 are staggered in the opposite directions on the forward side and the reverse side while slightly changing their positions from the state where they are located on the same axis in the neutral state. . Note that, in FIG.
The direction of the neutral position of each straight line connecting two specific points A and F, and B and G of the variable member 32 and the second variable member 35 is shown.

Here, in FIG. 4, A, B, C, D,
Each point of E indicates the axis center point of the rotation support shaft 31, the rotation support shaft 34, the swing shaft 38, the swing shaft 42, and the swing shaft 43, and the point F is the first point of the change lever 10. Connection point for variable member 32, G
The point is a connection point of the link mechanism 33 to the second variable member 35,
Point H indicates the connection point of the turning operation cable 41 to the third variable member 36, respectively.

Next, the case where the steering wheel 9 is steered rightward and the vehicle 1 turns rightward while the vehicle 1 is moving forward at a predetermined speed as described above will be described. In this case, the pinion 23 rotates clockwise,
The sector gear 24 meshing with this rotates left around the rotation shaft 25, and as described above, the swing operation cable 41 on the right side is pulled and the swing end of the third variable member 36 on the right side is coiled by a coil spring. Rotate against the urging force of 39.

Then, the second variable member 35 is
As shown in (b) and (c), the fourth variable member 37
The swash plate swing shaft 20 of the right-side hydrostatic continuously variable transmission 5 attempts to rotate in the direction of returning to the neutral position through the swing of the swash plate.
Is rotated to the side where the rotation speed of the right crawler belt driving wheel 7 is reduced. This allows the vehicle 1 to make a right turn. The return of the second variable member 35 to the neutral position is rapidly performed as the steering angle of the steering wheel 9 increases, as is clear from FIG.

In the case of FIG. 4C in which the steering angle of the steering wheel 9 is substantially 90 °, the return of the second variable member 35 to the neutral position side is performed after passing through the neutral position to the reverse side. Therefore, as is clear from FIGS. 5 and 6, the crawler belt driving wheel 7 on the right side is reversed, and the vehicle 1 performs a super pivot turn. In these figures, the control arm angle on the vertical axis represents the shift operation amount input to the continuously variable transmission 5. This angle is naturally also equal to the swing angle (rotation angle) of the swash plate swing shaft 20, and corresponds to the vehicle speed. In FIG. 6, the speeds of the inner and outer wheels at the positions of the steering angles of the steering wheel 9 are drawn at a distance in the horizontal axis direction for easy understanding. It is given by the intersection with the slant chain line.

In the speed change operation device 30 of the present embodiment, when the steering wheel 9 is steered rightward by a predetermined angle or more while the vehicle 1 is moving forward at a predetermined speed,
When the turning operation amount (tensile amount) of the right shift operation device 30 by the turning operation cable 41 exceeds a predetermined value, the second variable member
Since the amount of rotation of 35 also exceeds a predetermined value, the second variable member 35
The opening 45b formed in the plate-like member 45c of the second assembly 45 provided in the
It begins to engage the pin 44c of the first assembly 44 provided on 35.

As a result, the second variable member 35 of the left shift operating device 30 also rotates in the same direction as the rotation of the second variable member 35 of the right shift operating device 30, so that the left static shift device 30 rotates. Through the link mechanism 33 and the control arm 21 of the hydraulic continuously variable transmission 5, the left swash plate swinging shaft 20 is turned to the side that reduces the rotation speed of the left crawler belt driving wheel 7. Hereinafter, in this state, the left and right swash plate shafts 20 maintain a constant rotational angle difference, and also maintain a safe constant speed difference between the right crawler belt driving wheel 7 and the left crawler belt driving wheel 7, The vehicle 1 turns slowly to the right.

The opening 45b formed in the plate-like member 45c of the second assembly 45 is used to rotate the first assembly 44 when the vehicle 1 is moving forward or backward at a high speed.
Since the long side of the pin 44c is substantially perpendicular to the rotation direction of the pin 44c, the engagement between the opening 45b and the pin 44c is started earlier in the steering of the steering wheel 9 than in other cases. become. In other words, the higher the forward or marching speed of the vehicle 1, the more the crawler belt driving wheels (outer wheels) 7 on the outside of the turn.
Deceleration is started early. This is shown in FIGS.
Is shown in FIG.

When the steering wheel 9 is steered to the left and the vehicle is turned to the left, the speed change operation device 30
Operates in the same manner as described above, and a detailed description thereof will be omitted.

Since the speed change operation device of the present embodiment is configured as described above, the following effects can be obtained. The first to fourth variable members 32, 35, 36, 37 constituting the pair of shift operation devices 30 on the left and right are both rotated in the same direction, and both rotation support shafts 31, 34, the swing shaft 38, 42, 43,
Since they do not all intersect, the number of rotation support shafts and swing shafts can be reduced, rotation wear can be reduced, and the operability and wear resistance of the speed change operation device 30 can be improved.

Further, since the number of the rotation supporting shafts and the swinging shafts can be reduced, the portion of the plate (variable member) which is pivotally supported by the shafts and the like which causes backlash is reduced, and the accuracy of the speed change control is improved. Further, the structure of the device can be simplified and the device can be reduced in size.

Further, when a turning command operation amount for one of the speed change operation devices 30 exceeds a predetermined value by a simple combination of the pin 44c of the first assembly and the opening 45b of the second assembly, The traveling device on the other side can be decelerated very easily at very appropriate timing.

Furthermore, a hydrostatic continuously variable transmission, belt type, which is mounted on various types of walking or riding type vehicles for driving crawler tracks and wheels, such as crawler type transport vehicles, construction machines with caterpillars, cultivators, snow vehicles, etc. It can be applied to various continuously variable transmissions such as a continuously variable transmission, a cone type continuously variable transmission, a friction type continuously variable transmission, etc.
Its application range is extremely wide.

Next, the speed change operation device of the embodiment shown in FIGS. 7 and 8 will be described. Also in the present embodiment, a pair of shift operation devices 50 are provided on the left and right with exactly the same structure, corresponding to a pair of traveling devices provided on the left and right. Other structures are the same as the previous embodiment. In the following, the left shift operation device 50
I will explain mainly the structure of

The speed change operation device 50 includes a first variable member 52 connected to a change lever (speed switching operation member) 10 and a swash plate rocking shaft 20 which is a speed change amount input portion of the continuously variable transmission 5. The second link mechanism 33 is connected via the control arm 21 and pivotally supported so as to be rotatable around a rotation support shaft (fixed shaft) 54.
And the variable member 55. One end of the link mechanism 33
The second variable member 55 is connected to the lower portion of the swinging end near the center in the drawing.

A slide groove 56 is formed in the first variable member 52 in the longitudinal direction thereof, and the rotation support shaft (fixed shaft) 51 is inserted through the slide groove 56, whereby the One variable member 52 is rotatable around the rotation support shaft 51 and slidable in the direction of the slide groove 56. The left and right first variable members 52 are rotatably connected to each other at a center end, and the connection point 66 is moved up and down by operating the change lever 10. . Further, a slide groove 57 having one end opened is formed in the second variable member 55.

Between the first variable member 52 and the second variable member 55, there is interposed a connecting rod 58 as a third variable member for rotatably connecting these members to each other. The connecting rod 58 is
One of the spherical portions at both ends is rotatably and slidably fitted into the slide groove 56 of the first variable member 52, and the other is rotatably and slidably inserted into the slide groove 57 of the second variable member 55. And an intermediate portion thereof is slidably inserted in a vertical direction into a guide hole 60 formed in a cam body 59 which is a fourth variable member.

The cam body 59 is slidable in the left-right direction along the guide shaft 61, and the lower cam surface on which the lower end of the turning lever 62, which is the fifth variable member, can abut on the lower half of the center of the device.
An upper cam surface 64 to which the upper end of the revolving lever 62 can abut is formed in the upper half of the device 63 on the center side of the device. The pivot lever 62 is rotatable around a pivot support shaft (fixed shaft) 65 at the center thereof, and is pivotally operated by a pivot operation cable (rotation operation member) 41. A spring 68 is interposed between the cam body 59 and the turning lever 62, and constantly biases both cam bodies 59 toward the center of the apparatus around the neutral position of the turning lever 62. Reference numeral 67 denotes a stopper for restricting sliding of the cam body 59 toward the center of the apparatus.

Since the second embodiment is configured as described above, it operates as follows. When the change lever 10 is tilted forward, the connection point 66 is pulled upward, and the pair of left and right first variable members 52 is rotated around the rotation support shaft 51 to increase its inclination. Then, the pair of left and right connecting rods 58 is pulled upward in conjunction with this, so that the pair of left and right second variable members 55 engaged rotatably and slidably at the lower end sphere portion of the connecting rod 58. Is pivoted upward symmetrically,
The link mechanism 33 is pulled up (see FIG. 8A). Since then
A pair of left and right swash plate swing shafts 20 via a control arm 21
Is swung from the neutral position with a tilt of zero with respect to the pump rotation axis to a predetermined tilt position on the vehicle forward side, whereby the vehicle 1 obtains the output of the swash plate motor and turns the change lever 10 upside down. Forward at a predetermined speed according to the degree of

In this state, when the steering wheel 9 is steered to the right and the vehicle 1 turns to the right, the turning lever 62 is turned to the right in FIG. The lower end abuts against the lower cam surface 63 of the left cam body 59 and moves it to the left. Then, the left connecting rod 58 moves downward while being restricted by the slide groove 56 of the first variable member 52 at the same time, and turns downward in the direction of returning the left second variable member 55 to the neutral position. Therefore, the rotational speed of the right crawler belt driving wheel 7 is reduced, and the vehicle 1 turns right. In this case, the upper end of the turning lever 62 comes into contact with the upper cam surface 64 of the right cam body 59, but has not yet been moved rightward (see FIG. 8B).

When the steering wheel 9 is further steered to the right, the upper end of the turning lever 62 pushes the right cam 59 to move it to the right, so that the right connecting rod 58 is simultaneously moved downward. Move and rotate the second variable member 55 on the right side downward in the direction of returning to the neutral position (FIG. 8C).
reference). As a result, the rotation speed of the crawler belt driving wheel 7 on the left side is also reduced, and the vehicle 1 slowly turns rightward at a safe speed. FIG. 8 shows the operating state of the speed change operation device 50 at each steering angle of the steering wheel 9 when the forward speed is switched in three stages.

Since the second embodiment is configured as described above, substantially the same effects as those of the first embodiment can be obtained. However, the turning operation for either one of the speed change operation devices 50 can be achieved with a particularly simple configuration. When the operation command amount exceeds a predetermined value, the traveling device on the other side can be very easily decelerated.

[Brief description of the drawings]

FIG. 1 is a side view of a crawler-type transport vehicle with a continuously variable transmission to which a shift operation device according to a first embodiment of the present invention described in claims 1 to 8 of the present application is applied.

FIG. 2 is a rear view of the crawler type carrier with a continuously variable transmission of FIG. 1;

FIG. 3 is an enlarged perspective view of a speed change operation device in the embodiment of FIG. 1;

FIG. 4 is a view showing an operation state of a shift operation device in the embodiment of FIG. 1;

FIG. 5 is a diagram showing operating characteristics of a shift operation device in the embodiment of FIG. 1;

FIG. 6 is a view showing an operation state of the crawler type carrier in the embodiment of FIG. 1;

FIG. 7 is a longitudinal sectional side view of a speed change operation device according to another embodiment of the present invention.

FIG. 8 is a diagram showing an operation state of a speed change operation device in the embodiment of FIG. 7;

FIG. 9 is a cross-sectional side view of a main part of a conventional speed change operation device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Crawler type transport vehicle, 2 ... Body, 3 ... Carrier, 4 ... Internal combustion engine, 5 ... Hydrostatic continuously variable transmission, 6 ... Crawler belt support wheel, 7 ...
Crawler driving wheels, 8 crawler tracks, 9 handle, 10 change lever (speed switching operating member), 11 crankshaft, 12 drive pulley, 13 input shaft, 14 driven pulley, 15 endless V-belt, 16 … Clutch arm, 17… Tension pulley, 18…
Tension clutch lever, 19 ... Lever release lever, 20 ...
Swash plate swing shaft, 21 ... control arm, 22 ... handle shaft, 23 ... pinion, 24 ... sector gear, 25 ... rotating shaft, 26 ...
Frame pipe, 27 mounting plate, 28 substrate, 30 speed change operation device, 31 rotation support shaft, 32 first variable member, 33 link mechanism, 34 rotation support shaft, 35 second Variable member, 36: third variable member, 37: fourth variable member, 38: swing shaft, 39 ...
Coil spring, 40 stopper, 41 rotating cable (rotating member), 42 swing axis, 43 swing axis, 44
The first assembly, 44c ... pin, 45 ... second assembly, 45b ...
Opening 46, stopper 50, transmission operation device 51, rotation support shaft 52, first variable member 54, rotation support shaft 55, second
Variable members of 56, slide groove, 57 slide groove, 58 connecting rod, 59 cam body, 60 guide hole, 61 guide shaft, 62
Swivel lever, 63: Lower cam surface, 64: Upper cam surface, 65: Rotating support shaft, 66: Connection point, 67: Stopper, 68: Spring.

 ──────────────────────────────────────────────────の Continued on front page (72) Inventor Hiroshi Takahashi 1-4-1, Chuo, Wako-shi, Saitama Pref. Honda Motor Co., Ltd.

Claims (2)

[Claims] 1. A shift operating device for a vehicle with a continuously variable transmission, comprising: a traveling device; a power source; and a continuously variable transmission for transmitting power from the power source to the traveling device. Is connected directly or indirectly through a transmission means to a first variable member rotated by operation of a speed switching operation member and a shift operation amount input portion of the continuously variable transmission, and A second variable member that varies a speed, a first rotation support shaft rotatably supporting the first variable member, and a second rotation member rotatably supporting the second variable member. Second
The first variable member and the second variable member are configured such that a rotational force is transmitted from the first variable member to the second variable member, and the first variable member and the second variable member 2. A shift operation device for a vehicle with a continuously variable transmission, wherein the shift member is detachably connected so that the variable member 2 can be independently rotated. 2. The traveling device is provided in a left and right pair,
The vehicle with a continuously variable transmission according to claim 1, wherein the continuously variable transmission and the shift operation device are provided in a pair on the left and right, respectively, corresponding to each of the pair of traveling devices on the left and right. Gearshift operating device.