JP2944396B2 - 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 having a split pulley structure in which a pair of pulleys which oppose each other and come into contact with a transmission belt are supported so as to be close to and away from each other.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a belt-type continuously variable transmission having a split pulley structure as described above. Focusing on the upper transmission shaft 41 in the belt-type continuously variable transmission shown in FIG. 6, one pulley portion 42 is fixed to the transmission shaft 41, and the other pulley portion 43 is movably moved along the transmission shaft 41. The transmission belt 44 is fitted over the pair of pulley portions 42 and 43. Then, the ring member 45 is mounted on the bearing 4 outside the pulley portion 43 on the moving side.
6, and the ring member 45 is connected to the pulley portion 43.
A ring-shaped cam member 47 (corresponding to a pressing member) having an inclined surface that presses the transmission shaft 41 through a bearing 48.
Is fitted outside.

By rotating the cam member 47 around the axis of the transmission shaft 41, the ring member 45 is rotated.
By moving the pulley portion 43 on the moving side toward and away from the pulley portion 42 on the fixed side, the winding radius of the transmission belt 44 is changed to perform the speed change operation.

[0004]

When assembling the belt-type continuously variable transmission shown in FIG. 6, focusing on the transmission shaft 41 on the upper side, as shown in FIG. The transmission shaft 41 is attached to the pulley portion 4 on the fixed side from the left side of the drawing with respect to the transmission shaft 41.
2. The transmission belt 44, the pulley portion 43 on the moving side, the bearing 46, the ring member 45, the bearing 48, and the cam member 47 are attached in this order. Thereafter, the other half case 50 is tightened by tightening the bolts 52 on the outer circumference of the half cases 49 and 50 while pressing the other half case 50 on the cam member 47 and pressing the other half case 49 side. , 50 are connected to complete the assembly of the belt-type continuously variable transmission.

In the assembling procedure described above, when the other half case 50 is finally put on the cam member 47 and pressed against the one half case 49 side, the transmission sandwiched between the pair of pulley portions 42, 43 The other half case 50 is pressed against the one half case 49 side by pushing and spreading the belt 44 outward in the radial direction of the pulley portions 42 and 43. When the other half case 50 is pressed, the transmission belt 4
A relatively large resistance is applied from 4.

In the state where the resistance from the transmission belt 44 is thus received, the other half case 50 is relatively large.
This is a difficult task of tightening the bolt 52 while uniformly pressing the entire outer circumference of the half case 49 against the outer circumference of the half case 49. Therefore, there is room for improvement in workability. SUMMARY OF THE INVENTION It is an object of the present invention to provide a belt-type continuously variable transmission having a split pulley structure so that a pair of half cases can be easily connected.

[0007]

According to a feature of the present invention, a pair of pulleys, which are opposed to each other and contact a transmission belt, are attached to an upper transmission shaft and a lower transmission shaft, respectively. One of the pulley portions is fixed to the transmission shaft, the other is configured to be movable along the transmission shaft, and a transmission belt is wound around the pair of pulley portions, and the In the belt-type continuously variable transmission configured to change the winding radius of the transmission belt by performing a shift operation by moving the pulley portion on the moving side toward and away from the pulley portion on the fixed side, the transmission shaft A spring is provided for urging the moving-side pulley portion of one of the transmission shafts toward the fixed-side pulley portion, and the end of the other transmission shaft on the fixed-side pulley portion side is The whole is supported on one of the pair of half case covering of the belt type continuously variable transmission, on the opposite side of the portion to the pulley portion of the fixed side of the other transmission shaft,
A pulley portion on the moving side, a pressing member for pressing the pulley portion on the moving side toward the pulley portion on the fixed side, and the transmission belt are configured to be sequentially attachable,
In the state where the other of the pair of half cases is attached to the pressing member side, the pressing member includes a screwing member that can be pressed and fixed to a predetermined position on the pulley portion side of the fixed side of the transmission shaft. An opening in which the screwing member can be screwed in from the outside of the other half of the half case is provided in the other half of the half case.

[0008]

(I) When configured as in the present invention, for example, as shown in FIGS. 1 and 2, when the transmission shaft 1 and the pulley portion 5 on the fixed side are attached to one half case 2 side, the transmission The belt 16, the pulley portion 6 on the moving side, and the pressing member 9 are sequentially attached to the transmission shaft 1 from the left side of the drawing, and the other half case 3
Is put on the pressing member 9. In a state where the other half case 3 is covered, the two half cases 2 and 3
It is in a state where it is slightly separated without contact due to the resistance from.

In this case, an opening 3b is formed in the other half case 3.
Is provided, the screw-in member 27 is screwed into the transmission shaft 1 through the opening 3b of the other half case 3 with the other half case 3 covered. Therefore, by the screwing operation of the screwing member 27, the pressing member 9 and the pulley portion 6 on the moving side are pushed into the fixed pulley portion 5 on the right side of the drawing of FIG. . If the pressing member 27 is pushed to a predetermined position on the transmission shaft 1, the resistance from the transmission belt 16 hardly hangs on the other half case 3, so that the separated half cases 2 and 3 can be easily separated. Can be adhered to. Thus, after the two half cases 2 and 3 are brought into close contact with each other, the two half cases 2 and
3 may be connected.

As described above, in the structure of the present invention, after the other half case is put on one half case side, the small screw-in member is screwed with a tool or the like, and the transmission belt from the transmission belt is removed. The two half cases can be easily brought into close contact with each other without receiving any resistance. After this close contact, the two half cases may be connected with bolts. Thus, in the state where the resistance from the transmission belt is applied as in the conventional configuration shown in FIG. 6, all of the relatively large outer periphery of the other half case is made uniform with respect to the outer periphery of the one half case. There is no need to perform such difficult work as connecting the two halves by tightening the bolts while pressing the halves.

(II) Even after assembling according to the present invention, for example, a tool is inserted into the opening 3b of the other half case 3 from the left side in FIG. 1 and the screwed member 27 is loosened and removed. It is possible to finely adjust the position of the pressing member 9 with respect to the transmission shaft 1 by replacing the thin plate-shaped shim 25 (see FIG. 2) or adding the number of sheets and screwing the screwing member 27 again. Can be performed.

[0012]

As described above, in the split pulley type belt-type continuously variable transmission, even if the operation of pressing the two half cases against the resistance of the transmission belt is not performed, a small screw-in operation is possible. By simply screwing the members, the two half cases can be easily brought into close contact and connected, so that the workability of assembling the belt-type continuously variable transmission can be improved. Further, even after assembling the belt-type continuously variable transmission, the position of the pressing member can be adjusted from the outside of the half case, so that the maintainability of the belt-type continuously variable transmission can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a belt-type continuously variable transmission according to the present invention will be described below with reference to the drawings. (1) As shown in FIG. 1, an input pulley 4 to which power is transmitted is fixed to an outer portion of the half case 2 with respect to the transmission shaft 1 on the upper side, and A pulley portion 5 is fixed to the inner portion, and a pulley portion 6 is externally fitted to the transmission shaft 1 so as to rotate integrally with the transmission shaft 1 and move in the axial direction by a structure of a ball and a groove facing the pulley portion 5.

A ring member 8 is rotatably fitted to the boss portion of the pulley portion 6 on the moving side via a bearing 7 so as to be rotatable. A pair of pins 8a fixed to the ring member 8 are rectangular and each corner is slightly formed. A rounded receiving member 8b is attached, and as shown in FIGS. 1 and 3, the ring member 8 enters the recess 3a of the other half case 3 and is prevented from rotating. A cylindrical cam member 9 (corresponding to a pressing member) is externally fitted to the transmission shaft 1 via a pair of bearings 10, and a concave portion formed by a pair of left and right symmetrical inclined surfaces 9a is formed by a cam member 9.
The roller 8c of the pin 8a of the ring member 8 is inserted into a pair of concave portions of the cam member 9.

In the lower transmission shaft 11 on the output side, a pulley portion 12
Is fixed, and a pulley portion 13 is externally fitted to the transmission shaft 11 so as to rotate integrally with the transmission shaft 11 and move in the axial center direction. The pulley portion 13 on the moving side of the transmission shaft 11 is urged by the spring 14 toward the pulley portion 12 on the fixed side, and the pulley portion 13 on the moving side is fixed to the fixed side in proportion to an increase in the load on the transmission shaft 11 side. A cam mechanism 15 is provided on the side of the pulley portion 12 for pushing. And
A transmission belt 16 is wound around the pulley portions 5 and 6 of the transmission shaft 1 and the pulley portions 12 and 13 of the transmission shaft 11.

In the state shown in FIGS. 1 and 3, the pulley portion 6 on the moving side of the transmission shaft 1 is farthest to the left of the drawing from the pulley portion 5 on the fixed side, and the pulley portion 13 on the moving side of the transmission shaft 11 is fixed. This is the state of the lowest speed position closest to the pulley portion 12 on the side. When the cam member 9 is rotated right and left from this state, the pulley portion 6 on the moving side of the ring member 8 and the transmission shaft 1 is pushed through the inclined surface 9a toward the pulley portion 5 on the fixed side. As the winding radius of the transmission belt 16 at the pulley portions 5 and 6 increases, the pulley portion 13 on the moving side of the transmission shaft 11 moves from the pulley portion 12 on the fixed side to the paper surface. Since the vehicle is moving rightward, the continuously variable transmission 1 is shifted to a higher speed.

(2) Next, a shift operation structure of the belt type continuously variable transmission will be described. As shown in FIG. 1, a boss member 17 is fixed to the boss portion of the cam member 9 outside the half case 3,
A speed change lever 18 is supported by the boss member 17, and a sector gear 19 is fixed to the boss member 17.
9 is provided with a motor (not shown) for rotationally driving the motor 9. The pin 17b of the arm 17a of the boss member 17
Is inserted into the opening 19a of the sector gear 19, and a pair of rubber-like pressure-sensitive sensors 21 are connected to the pins 17 of the arm 17a.
b is fixed to the sector gear 19 so as to sandwich it.

The state shown in FIG. 1 is a state in which the shift lever 18 is operated to the neutral stop position. From this state, when the shift lever 18 is operated in the front-rear direction of the paper to rotate the cam member 9, this state is shown. The pin 1 of the arm 17a is operated by the operation.
7b is pressed by the pressure sensor 21 and the motor is operated by the signal from the pressure sensor 21 so that the boss member 17 and the sector gear 19 rotate in the operation direction of the speed change lever 18, and the belt-type continuously variable transmission. Is shifted to the high speed side.
When the operation of the speed change lever 18 is stopped at a desired operation position, the motor also stops, and the speed change lever 18 and the belt-type continuously variable transmission are held at this operation position by the motor.

(3) Next, assembly of the belt type continuously variable transmission in the vicinity of the upper transmission shaft 1 will be described. As shown in FIG. 2, the pulley portion 5 is fixed to the transmission shaft 1 in advance, and the end of the transmission shaft 1 on the pulley portion 5 side is attached to one half case 2 via a bearing 22. Next, the transmission belt 16, the pulley portion 6 on the moving side, the ring member 8 and the bearing 7 assembled in advance, and the cam member 9 and the bearing 10 assembled in this order are mounted on the transmission shaft 1 in this order on the paper of FIG. Attach from the left side, and finally cover the other half case 3. As shown in FIG. 2, an opening 3 b is provided in the half case 3, and when the other half case 3 is covered, the boss portion of the cam member 9 is removed from the opening 3 b of the half case 3. Halves case 2, 3
Are slightly separated from each other without being closely attached due to resistance from the transmission belt 16.

The transmission shaft 1 is provided with a round hole 1a, and a cylindrical connecting member 23 having a screw hole 23a is provided at an end of the round hole 1a on the left side of the paper surface (the pulley portion 6 on the moving side). It is attached by a stopper ring 24. As a result, when the half case 3 is covered as described above,
As shown in FIG. 2, a plurality of thin plate-shaped shims 25 and a disk-shaped holding plate 26 are
Through the opening 3b and the cam member 9 and into the round hole 1a of the transmission shaft 1, and the outer peripheral portion of the holding plate 26 is brought into contact with the inner periphery of the bearing 10 on the cam member 9 side.

Next, a bolt 27 (corresponding to a screw-in member)
Is screwed into the screw hole 23a of the coupling member 23 on the transmission shaft 1 side while passing the holding plate 26 and the shim 25 through the opening 3b of the half case 3 and the inside of the cam member 9. Therefore,
By the screwing operation of the bolt 27, the bearing 10, the cam member 9, the ring member 8, and the pulley portion 6 on the moving side are fixed to the right side in FIG. Side pulley part 5 side. In this case, the screw hole 23a of the connecting member 23 is slightly displaced outward from the center of the transmission shaft 1 and the connecting member 23, and the bolt 27 is screwed into the screw hole 23 of the connecting member 23.
When the screw is inserted into the transmission shaft 1, the connection member 23 is prevented from rotating in the round hole 1 a of the transmission shaft 1 by screwing the bolt 27.

As described above, the bolt 27 is screwed to a predetermined position and the cam member 9 is pushed to a predetermined position of the transmission shaft 1 so that the separated half cases 2 and 3 come into close contact with each other. So you can do both halves,
After the parts 3 are brought into close contact with each other, the two half cases 2 and 3 are connected by bolts 28. After that, the input pulley 4 is attached to the transmission shaft 1 as shown in FIG.
The boss member 17 and the like may be attached to the boss portion of the cam member 9 that goes out of the half case 3. Even after assembling as described above, it is possible to insert the tool from the left side of the paper surface of FIG. 1 and loosen the bolt 27 to remove it. , The position of the cam member 9 with respect to the transmission shaft 1 can be finely adjusted.

[First Alternative Embodiment] The connecting member 23 and the bolt 27 of the transmission shaft 1 shown in FIG. 1 and FIG. 2 may be omitted, and a configuration shown in FIG. 4 may be adopted. In the configuration of FIG. 4, a male screw portion 1 b is provided at the end of the transmission shaft 1, and the male screw portion 1 b of the transmission shaft 1 is set so as to project outward from the cam member 9 when the half case 3 is covered. ing. Then, the thrust bearing 29 is attached to the end of the cam member 9, the holding plate 31 is applied to the thrust bearing 29, and the nut 30 (corresponding to a threaded member) is screwed into the male screw portion 1 b of the transmission shaft 1. , The cam member 9 and the like are pushed in.

[Second Alternative Embodiment] The connecting member 23 and the bolt 27 of the transmission shaft 1 shown in FIGS. 1 and 2 may be omitted, and a configuration shown in FIG. 5 may be adopted. In the configuration of FIG. 5, a male screw 1 is attached to the end of the transmission shaft 1 as in FIG.
b, and the shim 25 is mounted on the bearing 1 of the cam member 9.
0, the holding plate 31 is applied to the bearing 10, and the nut 30 (corresponding to a threaded member) is attached to the transmission shaft 1.
The cam member 9 and the like are pushed in by screwing into the male screw portion 1b.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a belt-type continuously variable transmission.

FIG. 2 is a longitudinal sectional front view of the vicinity of a transmission shaft on the upper side of the belt-type continuously variable transmission before a bolt is screwed in;

FIG. 3 is a plan view of the vicinity of a cam member on the transmission shaft on the upper side of the belt-type continuously variable transmission.

FIG. 4 is a cross-sectional plan view near the transmission shaft on the upper side of the belt-type continuously variable transmission according to the first alternative embodiment.

FIG. 5 is a cross-sectional plan view near the transmission shaft on the upper side of a belt-type continuously variable transmission according to a second alternative embodiment.

FIG. 6 is a longitudinal sectional front view of a belt-type continuously variable transmission having a conventional structure.

[Explanation of symbols]

 1,11 Transmission shaft 2,3 Half case 3b Half case opening 5,6,12,13 Pulley part 9 Pressing member 14 Spring 16 Transmission belt 27,30 Screw-in member

Claims (1)

(57) [Claims] 1. A pair of pulley portions (5), (6), (12), which are opposed to each other and contact a power transmission belt (16).
(13) is attached to each of the upper transmission shaft (1) and the lower transmission shaft (11), and one of the pair of pulley portions (5), (6), (12), and (13). Is fixed to the transmission shafts (1) and (11), and the other is configured to be movable along the transmission shafts (1) and (11).
The pair of pulley portions (5), (6), (12),
A transmission belt (16) is wound around (13), and the pair of pulley portions (5), (6), (12), (13)
The winding radius of the transmission belt (16) is changed by operating the pulley portions (6) and (13) on the moving side closer to and away from the pulley portions (5) and (12) on the fixed side. A belt-type continuously variable transmission configured to perform a speed change operation by one of the transmission shafts (1) and (11).
The movable side pulley portion (13) in 1) is fixed to the fixed side.
A spring (14) for urging the pulley portion (12) is provided.
The end of the other transmission shaft (1) on the fixed pulley portion (5) side is connected to one of a pair of half cases (2) and (3) covering the entire belt type continuously variable transmission. was supported, on the opposite side of the portion to the pulley portion of the fixed side (5) in the other transmission shaft (1), the pulley portion of the movable (6), the stationary pulley portion (6) of the movable A pressing member (9) for pressing the pulley portion (5) side and the transmission belt (16) can be sequentially attached, and the pressing member (9) is fixed to the pulley on the transmission shaft (1). A screw-in member (27), (30) that can be pushed into and fixed to a predetermined position on the part (5) side, and the other of the pair of half cases (2), (3) is pressed into the pressing member (9). The half case (2) in a state attached to the side (3) the threaded member from the other outer (27), (30) a threaded operable openings (3b)
Is provided on the other of the half cases (2) and (3).