JP3283241B2 - Belt-type continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-type continuously variable transmission for use in a working vehicle such as a rice transplanter or the like, and more particularly, a movable sheave in both a driving side and a driven side pulleys is axially moved by a cam. And to an operating device that shifts the speed by shifting the speed.

[0002]

2. Description of the Related Art In general, a riding rice transplanter transmits power from an engine to a gear transmission in a transmission case through a multi-stage pulley device, and operates a tension in each belt of the multi-stage pulley device to change the speed. At the same time, the desired rotation is transmitted to the traveling wheels and the planter shaft by switching the gear transmission.

It has also been considered to use a belt-type continuously variable transmission instead of the multi-stage pulley device. in this case,
In the belt-type continuously variable transmission, the movable sheaves of the drive-side and driven-side pulleys are both moved in the axial direction by an adjusting member including a cam member and a roller member that rotate relative to each other, whereby the effective diameter of the belt is continuously variable. The speed is changed to.

At this time, generally, the operating force from the operating lever is directly connected to the movable portion of each of the adjusting members,
Alternatively, both of the movable members on the driving side and the driven side are connected by a connecting rod, and the operating lever is connected to the connecting rod via a link or the like.

[0005]

However, in the conventional connection between the operating lever and the two adjusting members, the transmission of force from the operating lever to the two adjusting member movable portions is not rational.
Unnecessary force is generated in the link connecting portion, extra force is required for operating the operation lever, and the device is also increased in size.

Accordingly, the present invention is arranged such that the force can be transmitted from the operating lever to the movable portion of the adjusting member without waste, thereby reducing the operating force, reducing the number of parts, and facilitating assembly. It is an object of the present invention to provide a continuously variable transmission.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and each of the fixed sheaves (2
5), (26) and a driving pulley (22) and a driven pulley (23) composed of movable sheaves (27) and (29), and these two movable sheaves are brought into contact with each other by a cam action surface (33a). ), A movable part (33) having (36a),
(36) and a belt-type continuously variable transmission (17) which is moved in the axial direction by the relative rotation of the fixed parts (32) and (35) to change the speed, and the two movable parts (33, 36) are cam-connected. The two movable parts (33, 36) and the cam connecting rod (50) are connected by a rod (50) so as to form a parallel link, and an intermediate part of the cam connecting rod (50) is connected.
Operation lever (41) and cam connection to operation lever (41)
The connecting position of the rod (50) is connected so as to be adjustable, and by operating the operating lever (41), the two movable parts (33, 3) are operated.
6), and the two movable parts (33,
36) and the connecting portion (52,5) of the cam connecting rod (50).
And 3) the force is transmitted in a direction substantially orthogonal to the line connecting.

In addition, an adjuster means (90) is interposed between a fixing portion (32) and a fixing member (92) of the driving pulley (22) and the driven pulley (23).
The fixing position of the fixing portion (32) is configured to be rotatable.

[0009]

According to the above construction, the operating force from the operating lever (41) is directly transmitted to the movable portion (33) of the driving pulley (22) and the driven pulley (23) via the cam connecting rod (50). To the movable part (36). In this case, two movable portion (33, 36) are connected to form a parallel link out with cam coupling rod (50), the intermediate portion operating lever (41) of the cam connecting rod (50), the operation lever
-Adjust the connecting position of (41) and cam connecting rod (50)
It is connected as possible . And the operation lever (41)
Operation, the center of rotation (O) of both movable parts (33, 36)
1, O2), the line connecting the two movable parts (33, 36) and the connecting part (52, 53) of the cam connecting rod (50),
Since the force is transmitted in a direction substantially orthogonal to the direction, the movable portions (33, 36) can be moved with a small lever operation force.

When assembling, the adjuster means (90)
Is loosened, the connecting rod (50) is assembled, and the V belt (24) is wound between the pulleys (22) and (23). In this state, the adjuster means (90) is operated to rotationally move the fixing portion (32) to apply a predetermined tension to the V-belt (24), and to operate the operation lever (41) and both pulleys (22), ( Adjust so that the shift position of 23) matches.

[0011]

As described above, according to the present invention,
The intermediate portion to the operating lever (41) of the two movable portion (33, 36) connected to form a parallel link out with cam coupling rod (50), and the cam connecting rod (50), operating Le
Adjust the connecting position between the bar (41) and the cam connecting rod (50).
Was linked to integer, the operation of the operation lever (41), the connecting portion of the rotation center and the both movable portion (33, 36) and the cam connecting rod (50) of the two movable portions (33, 36) ( 52, 53), the force is transmitted in a direction substantially orthogonal to the line connecting the movable lever (41) and the movable lever (33), (36). Thus, the operating force of the operation lever (41) can be reduced, and the link efficiency can be improved and the number of parts can be reduced. Further, the cam connecting rod (5)
0) to the operation lever (41), and the operation lever (4).
1) The connecting position of the cam connecting rod (50) can be adjusted.
Since they were connected, the operating lever (41) and the connecting rod (5
Adjust the connection position of 0) to affect the belt tension
Without the operation position of the operation lever (41) and the belt type
It is possible to correspond to the shift position of the step transmission (17).
Wear.

Further, the use of the adjuster means (90) between at least one of the fixing portion (32) and the fixing member (92) facilitates the assembly of the belt type continuously variable transmission (17). This makes it possible to adjust the belt tension and to adjust the shift position of the operation lever (41) and the transmission.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
And a traveling body 5 supported by the rear wheels 3. An engine 6 and a transmission case 7 are mounted on a front part of the body 5, and a driver's seat 9 having a seat 8 is provided on a rear part thereof. Are located. A planting device 11 is supported at the back of the traveling machine body 5 via a link 10 so as to be able to move up and down, and the planting device 11 is provided with a seedling rest 12,
It includes a planter 13 and a float 15 and is driven up and down by a hydraulic cylinder device 16.

As shown in FIG. 2A, a belt-type continuously variable transmission 17 according to the present invention is provided between an output shaft 6a of the engine 6 and a transmission input shaft 7a protruding from the transmission case 7. Are located.
Further, a forward / reverse switching shaft 19 extends vertically on the side of the transmission 7.
The yoke 2 has a groove 20a at the upper end protruding from the transmission case 7 as shown in FIG.
0 is fixed. A shift arm 21 is fixed to the lower end of the shaft 19, as shown in FIG. 2C. The shift arm 21 is connected to a forward / reverse switching built in the transmission case 7 via a shift shaft 28. By operating a gear (not shown), the state can be switched to the forward state F, the neutral state N, and the reverse state R.

On the other hand, the belt type continuously variable transmission 17 is
It has a driving pulley 22 mounted on the engine output shaft 6a and a driven pulley 23 mounted on the transmission input shaft 7a, and a V-belt 24 is wound between them. Drive side pulley 22 and driven side pulley 23
Are fixed sheaves 25 and 26, respectively, as shown in FIG.
And movable sheave bosses 27a, 29a, and movable sheave bosses 27a, 29a of fixed sheave bosses 25a, 26a, respectively.
Are slidably inserted by the key 38 only for sliding. The shaft end of the driving pulley 22 and the driven pulley 23
Are provided with speed change adjusting members 30, 31 respectively.

The driving-side adjusting member 30 is mounted on the distal end of the driving-side fixed sheave boss 25a via a bearing and fixed to the fixed member 3.
And a roller support 32 connected to the roller support 4 and having an annular shape.
A roller 32a is rotatably supported at a phase interval. A cam member 33 is rotatably supported on the drive-side movable sheave boss 27a via a bearing via a bearing. The cam member 33 has an end face cam portion 33a in contact with the roller 32a and has an outer surface. It has an arm portion 33b extending in the radial direction.

The driven adjustment member 31 includes a roller support 35 fixed to the outer surface of the transmission case 7 and a cam member 36 supported only on a movable sheave bob 29a via a bearing so as to be rotatable only. The roller support 35 rotatably supports the two rollers 35a, and the cam member 36
And an arm portion 36b extending in the outer diameter direction.

Then, the roller support 35 is moved to the position shown in FIG.
As shown in (a) and (b), a support bolt 37 of the roller support 35a is planted in the outer peripheral direction at 180 degrees apart from a notched annular body (C-shaped body) which is cut off at a predetermined angle. And is fixed to the side wall of the transmission case 7 by bolts 39. The transmission case 7 has a notch 35c so as to surround a portion 7c for holding the bearing 40 for the shaft 7a.
Are arranged so as to correspond to the convex portions. When the concave portion of the end face cam portion 36a is in contact with the roller 35a, the projecting portion of the cam portion 36 is set so as to be located at the notch portion 35c. Thereby, the amount of protrusion of the roller support 35 from the side surface of the case is minimized, and the driven pulley 23 is
In addition to being close to the transmission case 7, it is arranged so as to prevent interference with the reverse switching shaft 19, thereby achieving compactness.

An operation lever 41 extends upward from the portion of the continuously variable transmission 17 toward the driver's seat 9. The operation lever 41 is, as shown in FIGS. 2 and 6, a shaft 4 fixed via a bracket of the steering column 42.
3 is a base 41a supported so as to be swingable in the longitudinal direction of the machine.
And a lever body 41b supported on the base 41a by a pin 44 so as to be swingable in the left-right direction of the machine. Furthermore,
A plate 45 is fixed to a root portion of the lever main body 41b. The plate 45 supports the pin 44, and penetrates through the plate to form a bolt pin 46.
Has been fixed. One end portion 46a of the bolt pin 46
Is the yoke groove 20 of the forward / reverse switching shaft 19 described above.
a can be freely engaged or disengaged from the
6b is a U-shaped guide groove 47 of a guide plate 47 fixed to the steering column 42 via a bracket.
a. Therefore, the operation lever 41 is guided by the guide groove 47a and can be operated only in the front-rear direction (HL) at the R (reverse) or F (forward) position.

FIGS. 4A and 4B and FIG.
As shown in (a) and (b), the base 4 of the operation lever 41 is
1a, an operation arm 41c is attached to the shaft 43 by a bell clamp.
The operating arm 41c has a
A long hole 80 is provided along the longitudinal direction of the arm 41.
You. In addition, the cam member 3 in the drive side adjustment member 30
3 in the arm portion 33b and the driven side adjustment member 31
Between the cam member 36 and the arm 36b of the cam member 36.
The cam members 33 and 3 are interposed and connected.
Numeral 6 moves together. And the connection
An elongated hole 82 is provided at the center of the rod 50,
The pin 81 is fitted in the elongated hole 82 and can be positioned at any position in the elongated hole direction.
And is fixed by bolts 83. And the pi
81 is inserted into the elongated hole 80 formed in the arm member 41c.
The arm member 41c moves via the pin 81.
And transmitted directly to the connecting rod 50. Further, FIG.
As described above, the cam members 33 and 36 on the driving side and the driven side are
The connecting rod 50 is made of the same shape,
The mechanism constitutes the center line O of the engine output shaft 6a.₁And tiger
Center line O of transmission input shaft 7a_TwoLine O connecting₁−
O_TwoThe connecting rod 50 moves parallel to the
In the cam member 33 and the driven side cam member 36, the center
Line O₁-O_TwoA line O orthogonal to₁-C₁, O_Two-C_TwoIn
It is arranged to operate on the high speed side H and the low speed side L
I have. Therefore, in the drive side cam member 33, the engine
Center line O of output shaft 6a₁And connecting rod 50 and arm 3
6 is the center of the connecting rod 50.
Line O that is 90 degrees to the line₁-C ₁Centered on nothing
The high-speed side H and the low-speed side L of the step transmission 17 are distributed.
Similarly, the driven side cam member 36
A line connecting the transmission input shaft 7a and the connecting pin 53 is connected.
Line O which becomes 90 degrees to connecting rod 50_Two-C_TwoAround
The high-speed side H and the low-speed side L are allocated.

Then, below the driving side cam member 33,
As shown in FIG. 4 (b), the continuously variable cam rotation preventing device 9
0, the speed is adjusted according to the difference in the position of the V-belt 24. 91 is a tight arm pulley 91a at the tip
A tight arm supporting the tight arm 9
Bracket 9 attached to a fulcrum shaft 92 provided in
At the end of 5, a screw portion is provided so as to be adjustable. Further, a plate 93 for preventing rotation is mounted at a right angle to the fixed cam (roller mounting bracket) 97 so as to be adjustable in the long hole direction, and the tip of the plate 93 is defined as the end of the bracket 95. It can be adjusted by a nut 96.

In FIGS. 5 and 3, reference numeral 55 denotes a hydraulic pulley fixed to the engine output shaft 6a;
Is a pulley connected to the hydraulic pump, and 57 is both pulleys 5
A belt wound around 5, 56 and 59 is the tight pulley. Reference numeral 60 denotes a tight pulley for applying a predetermined tension to the V-belt 24 of the continuously variable transmission, reference numeral 61 denotes a pin implanted in a fixing member, reference numeral 62 denotes a pin rotatably supported by the pin, and supports the tight pulley 60 at one end. It is a tight arm on which a spring 63 is stretched.

On the other hand, as shown in FIGS.
A fan-shaped positioning plate 66 is integrally fixed to the operation lever base 41a supported by the shaft 43, and a large number of uneven portions 66a are formed at the tip of the plate 66. Further, a roller 69 is rotatably supported at an intermediate portion of the arm 67 which is swingably supported by the fixed member, and a spring 70 is stretched at a tip portion thereof. Then, the roller 69 is moved by the spring 70
The operation lever 41 and the continuously variable transmission 17 are positioned and held at a predetermined shift operation position by elastically contacting the uneven portion 66a of the plate 66 by the urging force based on the above.

Next, the operation of the transmission in the above-described riding rice transplanter P will be described.

When the bolt pin 46 of the operating lever 41 is guided by the guide groove 47a of the guide plate 47 and is operated forward, for example, at the forward position F, that is, from the low-speed position L to the high-speed position H, the base of the operating lever 41 41a
The operation arm 41c integrated therewith rotates around the shaft 43 in the counterclockwise direction. Then, the slot 8 is inserted into the operation arm 41c.
It is transmitted to the connecting rod 50 via the pin 0 and the pin 81, and further directly moves the cam member 33 on the driving side and the cam member 36 on the driven side. At this time, the driving side and driven side cam members 3
Since the arm portions 33b and 36b are distributed right and left around a position orthogonal to the connecting rod 50, the operating arms 41c and
Forces are efficiently transmitted from the connecting rod 50 to the drive-side cam member arm portion 33b and the driven cam member arm portion 36b in an almost orthogonal state, and the two cam members 33 and 36 are reliably moved with a small lever operation force. can do.

The cam members 33 and 36 move in the axial direction based on the fact that their end cam portions 33a and 36a rotate while abutting on the rollers 32a and 35a fixed in the revolving direction and the axial direction. Then, the movable sheave 27 of the driving pulley 22 is adjusted such that the effective diameter of the pulley is reduced, and the movable sheave 29 of the driven pulley 23 is adjusted such that the effective diameter of the pulley is increased. As a result, the speed of the belt-type continuously variable transmission 17 is shifted to the high-speed side, and the high-speed rotation is transmitted via the transmission in the transmission case 7 to the wheels 2 and 3 and the planter 1 of the planting device 11.
3 and the seedling rest 12. The operation lever 4
When 1 is operated from the high speed side to the low speed side, the continuously variable transmission is similarly shifted to the low speed side.

When the operating lever 41 is operated to the low speed position L, the pin 46a implanted in the plate 45 integrated with the lever body 41b engages with the groove 20a of the yoke 20.
In this state, when the operation lever 41 is operated in the left-right direction about the pin 44 and the pin 46b along the guide groove 47a, the shift shaft 22 is operated in the axial direction via the yoke 20, the shaft 19 and the shift arm 21. I do. This allows
The forward / reverse switching gear in the transmission case 7 is operated to the forward position F, the neutral position N, and the reverse position R in accordance with the lateral operation positions F, N, R of the operation lever 41, respectively.

When the V-belt 24 is extended by use, it is absorbed by the tight pulley 91a. To absorb the elongation of the V-belt 24, a nut 96 constituting the adjuster means 90 is adjusted, and the drive-side adjusting member is adjusted. The adjustment is performed by adjusting the fixing position of the fixing member 32 of 30. Further, the shift position between the operation lever 41 and the continuously variable transmission 17 can be adjusted by the adjuster means 90. However, for more accurate adjustment, the pin 81 is moved by the nut 83 by moving the pin 81. Operation lever 41 and connecting rod 5
By adjusting the connection position of 0, the operation position of the operation lever 41 and the shift position of the belt-type continuously variable transmission 17 can be associated with each other without affecting the belt tension.

When assembling the belt-type continuously variable transmission 17, the adjuster means 91 is loosened and the pulleys 22 and 23 are extended in a state where the sheaves of the driving pulley 22 are widened.
The connecting rod 50 is connected between the movable parts 33 and 36 while the V-belt 24 is assembled between them. In this state, the effective diameter of the driving pulley 22 is adjusted to a predetermined position by tightening the adjuster means 90 to adjust the rotation of the fixing portion 32, and a predetermined tension is applied to the V-belt 24.

In the above-described embodiment, the belt-type continuously variable transmission 17 mounted on the riding rice transplanter has been described. However, the present invention is not limited to this, and may be applied to other working vehicles such as a combine, and other devices other than the vehicle. The same applies to the continuously variable transmission used.

[Brief description of the drawings]

FIG. 1 is a side view showing a riding rice transplanter equipped with a belt-type continuously variable transmission according to the present invention.

2A is a side view showing an operation device for a continuously variable transmission and a forward / reverse switching device, FIG. 2B is a front view of the yoke, and FIG. 2C is a plan view showing the forward / reverse shift arm.

FIG. 3 is a sectional view showing a continuously variable transmission.

4A and 4B are diagrams showing an operating device of the continuously variable transmission, wherein FIG. 4A is a plan view and FIG. 4B is a side view.

5A and 5B are diagrams showing a main part of the operating device, wherein FIG. 5A is a plan view and FIG. 5B is a side view.

FIG. 6 is a rear view showing the operation device.

FIG. 7 is a view showing a main part thereof.

FIG. 8 is a view showing a roller support and a roller on a driven side;
(A) is a front view, (b) is a side view.

[Explanation of symbols]

 Reference Signs List 17 belt-type continuously variable transmission 22 drive-side pulley 23 driven-side pulley 24 V-belt 25, 26 fixed sheave 27, 29 movable sheave 32, 35 fixed portion (roller support) 33, 36 movable portion (cam member) 33a, 36a Cam action surface (end face cam portion) 41 Operating lever 50 Cam connecting rod 90 Adjuster means (Continuously variable cam rotation preventing device)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 9/00-9/26 F16H 61/26-61/36 F16H 63/00-63/38

Claims (2)

(57) [Claims] 1. A driving pulley and a driven pulley each comprising a fixed sheave and a movable sheave, and both movable sheaves are axially moved by relative rotation of a movable portion having a cam working surface and a fixed portion which come into contact with each other. A belt-type continuously variable transmission, wherein the two movable portions are connected by a cam connecting rod so as to form a parallel link between the two movable portions and the cam connecting rod, and the cam connecting rod To the operation lever.
The connection position of the bar and the cam connection rod is connected so that it can be adjusted ,
By operating the operation lever, a force is transmitted in a direction substantially orthogonal to a line connecting the center of rotation of the two movable portions and a connecting portion of the both movable portions and the cam connecting rod, A belt-type continuously variable transmission characterized by the above-mentioned. 2. A structure in which adjuster means is interposed between at least one of the fixing portions of the driving pulley and the driven pulley and a fixing member so that the fixing position of the fixing portion can be rotationally adjusted. The belt-type continuously variable transmission according to claim 1.