JPH0754137B2 - Pulley type transmission - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a pair of variable pulleys and a belt member wound around the pulleys.
The present invention relates to an improvement of a pulley type transmission in which the pulley diameter of each pulley is changed to change the gear ratio.

[0002]

2. Description of the Related Art Conventionally, in agricultural machinery and the like, a pulley type transmission utilizing belt transmission has been widely used in order to change the power of an engine and transmit it to a drive wheel or various working devices. As an example of a pulley type transmission utilizing this belt transmission, 1
A V-shaped belt groove is formed between each of the pair of rotary shafts and a fixed sheave fixed to each of the rotary shafts so as to rotate integrally and non-slidably, and a movable sheave on each shaft. A speed change pulley composed of a movable sheave, which is opposed to and is slidably supported, is provided, and a belt member is wound around the belt grooves of both speed change pulleys to move the movable sheave of each speed change pulley in the axial direction. It is well known that the speed change pulley type is designed to variably control the speed change ratio between both rotary shafts by changing the effective radius of the transmission belt wound around the belt groove between the fixed sheave and the sheave. ing.

For example, in the one disclosed in Japanese Utility Model Publication No. 48-14131, a mechanism for moving the movable sheave of each speed change pulley in the axial direction is provided with a speed adjusting metal fitting on the back side of the movable sheave via a thrust bearing. In addition to connecting the movable metal fittings, the movable metal fittings of both pulleys are connected with a wire, and the movable metal fittings are moved by the cam action of the ball rolling on the cam surface by rotating the movable metal fittings relative to the fixed metal fittings. It is designed to move in the axial direction together with the sheave.

[0004]

However, in the above-mentioned prior art, each movable sheave is provided with a speed adjusting metal fitting having a cam function on the back side thereof, and if the speed adjusting fitting is heavy, the transmission is heavy. Inevitably, it is difficult to reduce the weight of the transmission.

Further, since a speed adjusting metal fitting is required, there is a problem that the number of parts is large and the cost is high.

The present invention has been made in view of the above points, and an object thereof is to construct a structure in which the movable sheaves of both speed change pulleys are interlocked with each other using a wire as in the above-mentioned conventional example, and then the wire is By improving the connection structure,
It is intended to reduce the size and weight of a transmission and reduce its cost.

[0007]

In order to achieve this object, according to the invention of claim 1, a wire member and a wire case into which the wire member is slidably inserted are used, and a relative speed between them is used to perform both speed changes. The movable sheaves of the pulleys are coordinatedly moved in the axial direction.

Specifically, in the present invention, a pair of rotating shafts arranged in parallel to each other, fixed sheaves fixed to the rotating shafts in a rotationally integral and non-sliding manner, and to the fixed sheaves, respectively. A pair of speed change pulleys, each of which is composed of a movable sheave supported so as to be opposed to each other so as to be slidable in the axial direction on the rotating shaft, and the fixed sheaves face each other with respect to each other. The gear ratio between the rotating shafts is changed by connecting the movable sheave of each speed change pulley to and from the fixed sheave facing each other and changing the effective radius of each pulley with respect to the transmission belt. It is premised on a pulley type transmission with variable.

The fixed sheave side and the movable sheave side connecting members are connected to the fixed sheave and the movable sheave of each of the above-mentioned speed change pulleys via bearings so as to move integrally and relatively rotatably in the axial direction. One end of the rotary shaft is connected to the movable sheave side connecting member of the speed change pulley, and the other end is a wire member connected to the fixed sheave side connecting member of the other speed change pulley from one end side of the rotary shaft. One end of the rotary shaft is connected to the fixed sheave side connecting member of the one speed change pulley, while the other end is connected to the movable sheave side connecting member of the other speed change pulley from one end side of the rotary shaft, and the wire is internally provided. A flexible tubular wire case through which a member is slidably inserted; and a gear shift switching means for axially moving at least one movable sheave of the above-mentioned gear shift pulleys. Provided.

According to a second aspect of the present invention, each of the rotating shafts is hollow, the connecting member is fitted in the hollow rotating shaft, and the outer peripheral portion is connected to the fixed and movable sheaves via bearings. The configuration is

According to another aspect of the present invention, the gear shift switching means includes a wire member whose one end is connected to the movable sheave side connecting member of the speed change pulley, and the other end of the wire member is pushed and pulled to move the sheave. Is configured to move in the axial direction.

[0012]

With the above construction, in the invention of claim 1, when the gear ratio between both rotary shafts is switched, the movable sheave of one of the speed change pulleys is moved in the axial direction by the speed change switching means to be brought into contact with or separated from the fixed sheave. . A movable sheave side connecting member is connected to the movable sheave via a bearing, and the movable sheave side connecting member is connected to a fixed sheave side connecting member of the other speed change pulley via a wire member. Is connected to a fixed sheave of the other speed change pulley via a bearing, while a fixed sheave side connecting member is connected to the fixed sheave of the one speed change pulley via a bearing, and the connecting member is flexible. Since it is connected to the movable sheave side connecting member of the other speed change pulley via the wire case having the property, and this connecting member is connected to the movable sheave of the other speed change pulley via the bearing,
As the wire member tries to move in the longitudinal direction due to the axial movement of the movable sheave, the wire case moves in the longitudinal direction relative to the wire member while sliding the wire member inside. As a result, the movable sheave of the other pulley moves toward and away from the fixed sheave in the direction opposite to the contact and separation direction of the movable sheave of the one speed change pulley, that is, the movable sheave of each speed change pulley contacts the fixed sheave in the opposite direction. The effective radii of the pulleys with respect to the transmission belt are changed apart from each other, so that the gear ratio between both rotary shafts can be changed.

At this time, since the wire member and the wire case are connected to each of the fixed and movable sheave side connecting members, and the movable sheave is directly moved in the axial direction by the movement in the length direction, the speed is adjusted as in the conventional case. No need for metal fittings
It is possible to reduce the weight of the transmission.

Further, since the wire member and the wire case are connected so that when the movable sheave of one pulley approaches the fixed sheave as described above, the movable sheave of the other pulley moves away from the fixed sheave, the movable sheaves are connected to each other. The axial position can be maintained, and the belt thrusts generated by the respective speed change pulleys can be canceled by each other to reduce the operating force during the speed change.

Further, since the movable sheave is directly moved in the axial direction by the wire member and the wire case, the number of parts is reduced and the apparatus is downsized and the cost is reduced as compared with the conventional speed adjusting metal fitting. Can be achieved.

According to the second aspect of the present invention, each of the fixed sheave side and the movable sheave side connecting members is fitted and inserted in the hollow rotary shaft, and the outer peripheral portion thereof is connected to the fixed and movable sheaves via the bearing. Since the bearings and the connecting members can be downsized, the weight of the transmission can be further reduced. In addition, the bearing seal diameter can be reduced to reduce the rotation resistance,
The transmission efficiency of the transmission can be improved.

Further, since the wire member and the wire case are connected to the connecting member located at the central position of the fixed and movable sheaves, the fixed and movable sheaves can be easily moved in the axial direction. Moreover, since the connecting member and the bearing are housed in the rotary shaft, the appearance of the device can be improved.

According to a third aspect of the invention, the shift changeover means includes a wire member having one end connected to the movable sheave side connecting member of the speed change pulley, and the other end of the wire member is pushed and pulled to axially move the movable sheave. Since it is configured to move the movable sheaves of the two speed change pulleys, it is possible to directly transmit the shift operation force from the outside to the movable sheaves by using the connecting member for moving the movable sheaves of the two speed change pulleys in the axial direction. It is possible to further reduce the number of parts and reduce the weight.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the overall structure of a pulley type transmission A according to an embodiment of the present invention. The transmission A is used as a small transmission for transmitting relatively small power. In both figures, 1 is a hollow drive shaft as one rotary shaft, 2 is a hollow driven shaft as the other rotary shaft, and the drive side transmission shaft 3 is at the left end of the drive shaft 1 in FIG. The end portion, and the end portion of the driven side transmission shaft 4 are fitted to the left end portion of the driven shaft 2 in FIG. 1 so as to rotate together, so that the drive and driven shafts 1 and 2 are arranged in parallel with each other. Each end is supported by the transmission shafts 3 and 4.

A drive pulley 5 is provided on the drive shaft 1. The drive pulley 5 includes a flange-shaped fixed sheave 6 located on the opposite side of the drive shaft 1 from the drive-side transmission shaft 3 (right side in FIG. 1), and a flange-shaped movable sheave 7 located on the drive-side transmission shaft 3 side. Consists of. The fixed sheave 6 is fixed to the drive shaft 1 at the boss portion 6a so as to be rotationally integrated and non-slidable by a plurality of (for example, four) pins 8 arranged at equal intervals in the circumferential direction. On the other hand, the movable sheave 7
Is a plurality of axially elongated holes 1a, 1a, in the drive shaft 1.
... are slidably and rotatably coupled to the drive shaft 1 at the boss portion 7a so as to face the fixed sheave 6 by means of pins 9, 9 ,. A belt groove 10 is formed in the belt.

On the other hand, the driven pulley 11 is mounted on the driven shaft 2.
Is provided. The driven pulley 11 has the same structure as that of the driving pulley 5, and the driven side transmission shaft 4 of the driven shaft 2 is
Side (left side in FIG. 1) flange-shaped fixed sheave 12
And a flange-shaped movable sheave 13 located on the opposite side of the driven side transmission shaft 4. Fixed sheave 12 is driven shaft 2
Is fixed to the boss portion 12a by a plurality of pins 14, 14, ... Integrally and non-slidably, while the movable sheave 1
Reference numeral 3 designates a plurality of axially elongated holes 2a, 2 in the driven shaft 2.
, so as to face the fixed sheave 12 in a direction opposite to the facing direction of the movable sheave 7 with respect to the fixed sheave 6 in the drive pulley 5 on the drive shaft 1. The driven shaft 2 and the boss 1
A belt groove 14 is formed between the sheaves 12 and 13 so as to be slidably and rotationally integrated with each other at 3a. The V-belt B is wound around the belt groove 10 of the drive pulley 5 and the belt groove 16 of the driven pulley 11 to fix the movable sheaves 7 and 13 of the drive and driven pulleys 5 and 11, respectively. The pulley diameter (effective radius with respect to the V-belt B) of each pulley 5, 11 is changed by bringing the sheaves 6, 12 into and out of contact with each other. For example, as shown in phantom in FIG. 1, the movable sheave 7 of the drive pulley 5 is replaced by the fixed sheave 6
When the movable sheave 13 of the driven pulley 11 is separated from the fixed sheave 12, the rotation of the drive shaft 1 is increased to that of the driven shaft 2 by making the pulley diameter of the drive pulley 5 larger than that of the driven pulley 11. It transmits quickly. On the contrary, as shown by the solid line in FIG. 1, when the movable sheave 7 of the drive pulley 5 is separated from the fixed sheave 6 and the movable sheave 13 of the driven pulley 11 is brought close to the fixed sheave 12, the drive pulley By reducing the pulley diameter of 5 and increasing the pulley diameter of the driven pulley 11, the drive shaft 1
Is transmitted to the driven shaft 2 after decelerating its rotation.

Fixed sheave side and movable sheave side connecting members 17, 20 are housed in the drive shaft 1, respectively. The fixed sheave side connecting member 17 is a ring-shaped member having two through holes 18, 18 whose centers are symmetrical, and an inner race of a bearing 19 is immovably fitted to the outer periphery of the fixed sheave side connecting member 17. The outer race is immovably connected to the inner ends of a plurality of pins 8, 8 for fixing the boss portion 6a of the fixed sheave 6 to the drive shaft 1. With this structure, the fixed sheave side connecting member 17 is formed. It is connected to the fixed sheave 6 (driving shaft 1) via a bearing 19 so as to be immovable in the axial direction and relatively rotatable.

Further, the movable sheave side connecting member 20 has a screw hole 21 at the center thereof and a through hole engaging hole 21 on its side.
The inner race of the bearing 22 is immovably fitted to the outer periphery of the ring-shaped member having a. The outer race of the bearing 22 is the boss portion 7 of the movable sheave 7.
are fixedly connected to the inner ends of a plurality of pins 9 for fixing a to the drive shaft 1. With this structure, the movable sheave side connecting member 20 is connected to the movable sheave 7 via the bearing 22. They are connected so that they cannot move in the axial direction and are rotatable relative to each other.

On the other hand, in the driven shaft 2, fixed sheave side and movable sheave side connecting members 23 and 26 are housed, respectively. The fixed sheave side connecting member 23 is the same as the movable sheave side connecting member 20 of the drive pulley 5 and has a screw hole 24, and the inner race of the bearing 25 is immovably fitted to the outer periphery of the screw hole 24. The outer race of the bearing 25 is immovably connected to the inner ends of a plurality of pins 14, 14, ... For fixing the boss portion 12a of the fixed sheave 12 to the driven shaft 2. With this structure, the fixed sheave side connection is established. The member 23 is fixed to the fixed sheave 12 via the bearing 25.
It is connected to the (driven shaft 2) immovably in the axial direction and relatively rotatable.

Further, the movable sheave side connecting member 26 has one through hole 27 at the center similarly to the fixed sheave side connecting member 17 of the drive pulley 5, and the inner race of the bearing 28 is provided on the outer peripheral portion thereof. The outer race of the bearing 28 is non-movably fitted to the outer race, and the outer race of the bearing 28 has a plurality of pins 15 for fixing the boss portion 13a of the movable sheave 13 to the driven shaft 2.
The movable sheave side connecting member 26 is connected to the movable sheave 13 via a bearing 28 so as to be immovable in the axial direction and relatively rotatable.

A wire member 3 to be described later is provided in one through hole 18 of the fixed sheave side connecting member 17 in the drive pulley 5.
One end of a wire case 29 through which 0 is slidably inserted is fitted and fixed from one end side (right end side in FIG. 1) of the drive shaft 1. The wire case 29 extends to the driven pulley 11 side, and the other end is fitted and fixed from one end side of the driven shaft 2 through the through hole 27 of the movable sheave side connecting member 26 in the driven pulley 11. The wire case 29 has two tube portions 29a, 29a made of metal, one end of which is fitted in the through holes 18, 27 of the connecting members 17, 26, respectively, and which is bent in a direction perpendicular to the drive shaft 1 or the driven shaft 2. , And a flexible portion 29b connecting the other ends of the two tube portions 29a, 29a to each other. The flexible portion 29b is, for example, a resin thin wire coated with an outer surface of a metal thin wire spirally wound without a gap. In this portion, the wire case 29 has flexibility as a whole, and the flexible portion 29b is bent when the movable sheave 7 of the driven pulley 11 moves in the axial direction.

On the other hand, a bolt 31 having one end of a wire member 30 immovably fixed is screwed into a screw hole 21 of the movable sheave side connecting member 20 of the drive pulley 5. The wire member 30 extends to the driven pulley 11 side through one of the through holes 18 of the fixed sheave side connecting member 17 and the wire case 29, and the other end of the wire member 30 is driven pulley 1.
1 is connected to a bolt 32 through the through hole 27 of the movable sheave side connecting member 26, and the bolt 32 is screwed and fastened to the screw hole 24 of the fixed sheave side connecting member 23.

With the above construction, the movable sheave side connecting member 20 of the drive pulley 5 and the fixed sheave side connecting member 23 of the driven pulley 11 are connected by the wire member 30 from one end side of the drive and driven shafts 1, 2. The fixed sheave side connecting member 17 of the drive pulley 5 and the movable sheave side connecting member 26 of the driven pulley 11 are connected by the wire case 29 from one end side of the drive and driven shafts 1 and 2 as described above.

Further, the movable sheave 7 of the drive pulley 5 is
A gear changeover mechanism 34 is provided for moving the shaft in the axial direction. One end of the gear shift mechanism 34 is the drive pulley 5
Through hole 18 on the other side of the fixed sheave side connecting member 17 in
Further, it has an operation side wire case 35 fitted and fixed from the other end side of the drive shaft 1. This operation side wire case 35 is
A metal tube portion 3 which is bent in a direction perpendicular to the drive shaft 1 on the side opposite to the drive side tube portion 29a of the wire case 29.
5a and a flexible portion 35b, one end of which is connected to the other end of the tube portion 35a, and the other end of the flexible portion 35b is fixed through the housing A1 of the transmission A as a fixing member. The flexible portion 35b is the wire case 29.
Similar to the above, the outer surface of a metal thin wire spirally wound without a gap is covered with a resin.

Further, one end of the operating side wire member 36 is inserted into the engaging hole 21a of the movable sheave side connecting member 20 in the drive pulley 5 so as to be movably retained and fixed together with the wire member 30. This operation side wire member 3
6 is the other through hole 18 of the fixed sheave side connecting member 17
And the housing A1 through the inside of the operation side wire case 35.
The other end extends outward and is connected to an operating lever 37 that is rockably operated between a low speed position (Lo) and a high speed position (Hi). Then, by swinging the operating lever 37, the other end of the operating side wire member 36 is pushed and pulled to move the movable sheave 7 of the drive pulley 5 in the axial direction.
As shown by the solid line in FIG.
o)), the operation side wire member 36 is pushed to separate the movable sheave 7 of the drive pulley 5 from the fixed sheave 6 and bring the movable sheave 13 of the driven pulley 11 closer to the fixed sheave 12 to move the drive pulley 5 The diameter of the pulley is smaller than that of the driven pulley 11, the rotation of the drive shaft 1 is decelerated and transmitted to the driven shaft 2, and as shown by the phantom line in FIG.
When the operating lever 37 is positioned at the high speed position (Hi), the operating side wire member 36 is pulled to bring the movable sheave 7 of the drive pulley 5 closer to the fixed sheave 6, and the movable sheave 13 of the driven pulley 11 from the fixed sheave 12 to the fixed sheave 12. The pulley diameter of the drive pulley 5 is made larger than that of the driven pulley 11 so that the rotation of the drive shaft 1 is accelerated and transmitted to the driven shaft 2.

Further, as shown in FIG. 2, between the driving and driven pulleys 5 and 11, the driving force of the driving pulley 5 of the pair of spans of the belt B stretched between the pulleys 5 and 11 is the driving force. Thrust generating mechanism 3 that generates a belt thrust by pressing the loose side span (span on the left side in FIG. 2) when it is transmitted to the driven pulley 11 to apply tension to the belt B.
9 are provided. The thrust generating mechanism 39 includes an arm 4 supported by a housing A1 so as to be swingable by a shaft 40.
1 and a roller 43 rotatably supported on the tip of the arm 41 by a shaft 42. The arm 41 is configured so that the roller 43 presses the inner surface of the loose side of the belt B by a spring (not shown). It is urged to rotate in the clockwise direction.

Next, the operation of the transmission A of the above embodiment will be described. For example, when a low speed state in which the rotation of the drive shaft 1 is decelerated and transmitted to the driven shaft 2 is set, the operation lever 37 of the speed change mechanism 34 is positioned at the low speed position (Lo). Since the operating lever 37 is connected to the movable sheave side connecting member 20 of the drive pulley 5 via the operating side wire member 36, the operating side wire member 36 is moved along with the switching operation to the low speed position (Lo). The movable sheave side connecting member 20 is moved in the axial direction by being pushed, and the movable sheave 7 connected to the movable sheave side connecting member 20 via the bearing 22 and the pins 9, 9 ,. And move away from the fixed sheave 6. This allows the drive pulley 5
Is opened and the pulley diameter is reduced, and the reduction in the pulley diameter allows the V-belt B to move to the driven pulley 11 side.

Further, the bolt 31 screwed to the movable sheave side connecting member 20 of the drive pulley 5 is the driven pulley 1
The wire case 2 to the fixed sheave side connecting member 23 in FIG.
Since the movable sheave side connecting member 20 of the drive pulley 5 moves in the axial direction and is separated from the fixed sheave side connecting member 17, the wire member 30 is connected via the wire member 30 passing through the inside of the wire case 29. The wire case 29 connected to the fixed sheave side connecting member 17 of the drive pulley 5 is connected to the flexible portion 29 as the fixed sheave side connecting member 23 is moved by being pulled toward the drive pulley 5 inside.
While bending b, the movable sheave side connecting member 26 of the driven pulley 11 is relatively pushed in the axial direction, and the movable sheave side connecting member 26 is connected to the movable sheave side connecting member 26 via bearings 28 and pins 15, 15 ,. Movable sheave 13
Moves to the left in FIG. 1 and approaches the fixed sheave 12. As a result, the driven pulley 11 is closed and the diameter of the pulley is increased, and the increase of the pulley diameter causes the V belt B to move toward the driven pulley 11. As a result, the pulley diameter of the drive pulley 5 becomes smaller than that of the driven pulley 11, and the rotation of the drive shaft 1 is decelerated and transmitted to the driven shaft 2.

On the other hand, when the rotation speed of the drive shaft 1 is increased and transmitted to the driven shaft 2, the operating lever 37 is positioned at the high speed position (Hi). Along with this switching, the operation-side wire member 36 is pulled to move the movable sheave-side connecting member 20 in the opposite direction to the above, and the movable sheave 7 connected to the movable sheave-side connecting member 20 is also shown in FIG. Move to the right and approach the fixed sheave 6. This closes the drive pulley 5 and increases the pulley diameter,
The V belt B is pulled toward the drive pulley 5 side.

When the movable sheave side connecting member 20 of the drive pulley 5 moves in the axial direction and approaches the fixed sheave side connecting member 17, the wire member 30 is pushed in the wire case 29 toward the driven pulley 11 side. Then, the fixed sheave side connecting member 23 of the driven pulley 11 is moved. Along with this, the wire case 29 connected to the fixed sheave side connecting member 17 of the drive pulley 5 bends the flexible portion 29b as shown by the phantom line in FIG. 1 while relatively moving the movable sheave side of the driven pulley 11. The connecting member 26 is pulled in the axial direction, and the movable sheave 13 connected to the movable sheave side connecting member 26 moves to the right in FIG. 1 and separates from the fixed sheave 12. As a result, the driven pulley 11
Opens, the pulley diameter decreases, and V-belt B is driven pulley 1
Move to side 1. As a result, the pulley diameter of the drive pulley 5 becomes larger than that of the driven pulley 11, and the rotation of the drive shaft 1 is accelerated and transmitted to the driven shaft 2.

Therefore, in this embodiment, the movable sheave 7 of the drive pulley 5 and the fixed sheave 12 of the driven pulley 11 have bearings 22 and 25 and a connecting member 2, respectively.
0, 23 and a wire member 30 are movably connected in the axial direction, and the fixed sheave 6 of the drive pulley 5 and the movable sheave 13 of the driven pulley 11 are respectively connected to the bearing 1
The movable sheaves 7, 13 are directly connected to each other by the movement of the wire member 30 and the wire case 29 in the length direction, because the movable member 7 and the wire case 29 are connected to each other through the connection members 17, 26 and the wire case 29. Can be moved in the axial direction, a speed adjusting metal fitting is not required unlike the conventional case, and the weight of the transmission A can be reduced.

Moreover, when the movable sheave 7 (or 13) of one pulley 5 (or 11) approaches the fixed sheave 6 (or 12), the movable sheave 13 (or 7) of the other pulley 11 (or 5) is moved. Since the wire member 30 and the wire case 29 are connected to be separated from the fixed sheave 12 (or 6), the axial positions of the movable sheaves 7 and 13 can be maintained, and the pulleys 5 and 11 can be generated. It is possible to cancel out the belt thrust forces that occur, and to reduce the operating force when shifting.

Further, the movable sheaves 7 and 13 are connected to the wire member 3
0 and the wire case 29 are directly moved in the axial direction, so that the number of parts can be reduced and the transmission A can be downsized and the cost can be reduced as compared with the case where the speed adjusting metal fitting is used as in the conventional case.

Further, each of the fixed sheave side and movable sheave side connecting members 17, 23, 20 and 26 is fitted and inserted in the hollow drive or driven shafts 1 and 2, and the outer peripheral portions thereof are bearings 19, 25 and 22. , 28 and pins 8, 14, 9, 15 are connected to the fixed and movable sheaves 6, 12, 7, 13 so that the bearings 19, 25, 22, 28 and the connecting members 17, 23, 20, 26 are connected. Can be downsized, and the weight of the transmission A can be further reduced. In addition, the seal diameters of the bearings 19, 25, 22 and 28 are also reduced, the rotational resistance thereof can be reduced, and the transmission efficiency of the transmission A can be improved.

Specifically, FIG. 3 shows specific data of loss torque according to the inner diameter of the bearing. The inner race is rotated at a rotational speed of 5 with the outer race of the bearing fixed.
The torque after 3 minutes from the start of rotation when rotated at 00 rpm was read with a torque meter to determine the loss torque. When using two bearings on the driving and driven sides, the total loss torque is 0.04kgf · m. Therefore,
If the maximum input torque of the transmission is 0.25 kgf · m, 16% of this input torque (= (0.04 / 0.
25) x 100) will be lost, and the maximum transmission efficiency will be 84% (= 100-16), and only transmission efficiency of 84% or less can be expected (Because other losses are added, 84%
No more). On the other hand, as in this embodiment,
With a bearing with a small bearing diameter, for example, a contact type seal with a diameter of 15 mm, a rotational torque of about 0.0015 kgf.m will be lost.
When four bearings are used on the drive and driven sides, the total loss torque is 0.006kgf · m. Therefore, the maximum input torque of the transmission is 0.25 kgf · m 2.
4% (= (0.006 / 0.25) × 100) is lost, and the maximum transmission efficiency is 97.6% (= 100−
2.4), transmission efficiency of 97.6% or less is possible, and transmission efficiency of the transmission A is significantly improved.

Furthermore, fixed and movable sheaves 6, 1
Connecting members 17, 23, 2 located at the center of 2, 7, 13
Since the wire member 30 and the wire case 29 are connected to the wires 0, 26, the fixed and movable sheaves 6, 12, 7, 13 can be easily moved in the axial direction. In addition, the connecting members 17, 2
Since the gears 3, 20, 26 and the bearings 19, 25, 22, 28 are housed in the drive or driven shafts 1 and 2, the transmission A
The appearance and appearance of can be improved.

In addition, the operation side wire member 36 of the speed change mechanism 34 is connected to the movable sheave side connection member 20 of the drive pulley 5, and the operation side wire member 36 is connected to the operation lever 37.
Since the movable sheave 7 is moved in the axial direction by pushing and pulling by the movable sheave 7, the movable sheave side connecting member 20 for linking the movable sheaves 7 and 13 of both pulleys 5 and 11 and moving them in the axial direction.
Can be used to directly transmit the shift operation force from the outside of the transmission A to the movable sheave 7, and the number of parts of the transmission A can be further reduced and the weight can be reduced.

In the above embodiment, in order to give priority to switching the transmission A from the low speed state to the high speed state, the operating side wire member 36 is connected to the movable sheave 7 of the drive pulley 5 to change the high speed state to the low speed state. Belt B can be switched to
I try to return with the thrust balance. However, when making the switching from the high-speed state to the low-speed state the same,
The operation side wire member 36 may be connected to the movable sheave 13 of the driven pulley 11.

Although the wire member 30 and the operation side wire member 36 are fixed to the same bolt 31 in the above embodiment, they may be connected to the connecting member 20 by a dedicated bolt. It is also possible to branch one wire member in the middle, connect one to the movable sheave side connecting member 20, and connect the other to the operation lever 37.

Further, in the above embodiment, the movable sheave 7 of the drive pulley 5 and the fixed sheave 12 of the driven pulley 11 are connected by the wire member 30, and the fixed sheave 6 of the drive pulley 5 and the movable sheave 13 of the driven pulley 11 are connected. Wire case 29
Although the fixed sheave 6 of the drive pulley 5 and the movable sheave 13 of the driven pulley 11 are connected by a wire member,
The movable sheave 7 of the drive pulley 5 and the fixed sheave 12 of the driven pulley 11 may be connected by a wire case (the drive and driven pulleys 5 and 11 in the above embodiment are reversed), and the same effect is obtained. can get.

[0046]

As described above, according to the invention of claim 1, the speed change pulleys respectively provided on the pair of rotating shafts arranged in parallel to each other and the speed change pulleys wound around the speed change pulleys. For a pulley type transmission equipped with a transmission belt, the movable sheave side connecting member that is rotatably connected to the movable sheave of one pulley via a bearing and the fixed sheave of the other pulley can rotate via a bearing. The fixed sheave side connecting member connected to the fixed sheave side connecting member is rotatably connected to the fixed sheave side of one pulley via a bearing, and the bearing is connected to the movable sheave of the other pulley. A movable sheave side connecting member rotatably connected via a wire case made of a flexible tube through which the wire member is inserted, By changing the gear ratio by moving the movable sheave of the pulley in the axial direction, the movable sheave can be directly moved in the axial direction by the wire member and the wire case, and the weight of the transmission can be reduced. At the same time, there is a practically excellent effect that the number of parts can be reduced and the transmission can be downsized and the cost can be reduced.

According to the second aspect of the present invention, the rotating shaft is hollow, and the connecting member and the bearing are disposed inside the rotating shaft, so that the bearing and the connecting member are downsized, and the weight of the transmission is further reduced. In addition to reducing the bearing seal diameter, the rotation resistance can be reduced, the transmission efficiency of the transmission can be improved, and the appearance of the transmission can be improved.

According to the third aspect of the present invention, one end of the wire member is connected to the movable sheave side connecting member of the speed change pulley, and the other end of the wire member is pushed and pulled to move the movable sheave in the axial direction. As a result, by using the connecting member for moving the movable sheave of both speed change pulleys in the axial direction, the speed change operation force from the outside can be directly transmitted to the movable sheave, further reducing the number of parts and reducing the weight. Can be achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a transmission according to an exemplary embodiment of the present invention.

FIG. 2 is a front view of a transmission.

FIG. 3 is a characteristic diagram showing specific data of loss torque according to the inner diameter of a bearing.

[Explanation of symbols]

 A transmission 1 drive shaft (rotary shaft) 2 driven shaft (rotary shaft) 5 drive pulley 6 fixed sheave 7 movable sheave 11 driven pulley 12 fixed sheave 13 movable sheave 17,23 fixed sheave side connecting member 20,26 movable sheave side connection Member 19, 22, 25, 28 Bearing 29 Wire case 30 Wire member 34 Gear shift switching mechanism (gear shift switching means) 36 Operation side wire member 37 Operation lever B Belt

Claims (3)

[Claims] 1. A pair of rotating shafts arranged in parallel to each other, a fixed sheave fixed to the rotating shaft so as to rotate integrally and non-slidably, and a shaft to the rotating shaft so as to face the fixed sheave. Consisting of a movable sheave supported slidably in the direction,
The movable sheave is provided with a pair of speed change pulleys in which the facing directions of the fixed sheaves are opposite to each other, and a belt member wound around the speed change pulleys. The movable sheaves of the speed change pulleys face each other. In a pulley type transmission in which the gear ratio between both rotary shafts is made variable by changing the effective radius of each pulley with respect to the fixed sheave by changing the effective radius with respect to the transmission belt. A fixed sheave side and a movable sheave side connecting member, which are connected to each other via a bearing so as to be movable integrally and relatively rotatably in the axial direction, and one end of which is connected to the movable sheave side connecting member of the one transmission pulley from one end side of the rotary shaft. While the other end is connected, the other end is connected to the fixed sheave side connecting member of the other speed change pulley from one end side of the rotating shaft, and the other end is connected to the wire member. The fixed sheave side connecting member of the speed pulley is connected from one end side of the rotary shaft, while the other end is connected to the movable sheave side connecting member of the other speed change pulley from one end side of the rotary shaft, and the wire member is slid inside. A pulley type transmission comprising: a flexible tubular wire case that is movably inserted; and a gear shift switching unit that axially moves at least one movable sheave of the both gear shift pulleys. 2. The pulley type transmission according to claim 1,
Each rotary shaft is hollow, the connecting member is inserted into the hollow rotary shaft, and the outer peripheral part is connected to the fixed and movable sheaves via bearings. . 3. The pulley type transmission according to claim 1 or 2, wherein the shift changeover means includes a wire member whose one end is connected to the movable sheave side connecting member of the speed change pulley, and the other end of the wire member is pushed and pulled. A pulley type transmission characterized in that it is configured to move the movable sheave in the axial direction.