JP2002295614A - V-belt type continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a profitable belt-type continuously variable transmission by increasing a wrapping range of a V-belt around pulleys for improving the support rigidity of flanges of the pulley opposite to each other in a direction for coming close to each other. SOLUTION: The V-belt 6 is wrapped around a primary pulley 4 and a secondary pulley 5, and each straight part of the V-belt 6 extended between both the pulleys 4 and 5 is deformed by idler pulleys 11 and 21 which extend toward a surface including the axis of rotation of both the pulleys 4 and 5, and these straight parts of the V-belt are held in the condition that they come closer to the described surface than to an external tangent of a contact locus arc of the V-belt 6 in relation to the pulleys 4 and 5. Wrapping range δ, γ of the V-belt 6, in relation to both the pulleys 4 and 5, are thereby prolonged, and the supporting rigidity of the flanges of the pulley opposite to each other in a direction for coming close to each other is improved so as to restrict the tilting of the flanges in the direction for coming close to each other in a range, except for the V-belt wrapping range δ, γ. With this structure, both the pulleys 4 and 5, having a low rigidity and a support shaft having a low rigidity, can be used to be profitable in point of a cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a V-belt type continuously variable transmission, and more particularly to a V-belt type continuously variable transmission in which a V-belt is suitably wound around a pulley.

[0002]

2. Description of the Related Art A V-belt type continuously variable transmission is, for example,
"NISSAN published by Nissan Motor Co., Ltd.
March K11-type cars, new car manuals ". As shown in FIG. 1, the V-belt type continuously variable transmission transmits a rotation input from an engine 1 via a torque converter 2 to a forward / reverse switching mechanism 3 so as to be reversibly down-rotated in a primary direction (input pulley). 4, a secondary pulley 5 as an output pulley arranged side by side with the V-belt 6, and a V-belt 6 wound and wound between these pulleys in a headband shape as shown in FIG.

The forward / reverse switching mechanism 3 transmits the rotation indicated by an arrow from the engine 1 to the primary pulley 4 as it is in the forward rotation transmission state, and the V-belt 6 transmits the rotation of the primary pulley 4 to the secondary pulley 5. It is transmitted with the rotation direction unchanged. The rotation of the secondary pulley 5 is transmitted to the differential gear device 8 via the idler gear 7 for adjusting the rotation direction, whereby the rotation direction of the differential gear device 8 indicated by the arrow is made to coincide with the rotation direction of the engine 1. .

In shifting, as shown in FIG. 2, the width of one of the pulleys 4, 5 around which the V belt 6 is wound is increased while the width of the V groove of the other pulley is decreased. Thus, the gear ratio can be changed steplessly by changing the diameter of the arc around which the V belt 6 is wound around the pulleys 4 and 5.

[0005]

By the way, in a conventional V-belt type continuously variable transmission typified by the one described in the above-mentioned document, the V-belts of the pulleys 4 and 5 indicated by α and β in FIG. The winding arc length (wrapping area) of the belt 6 was relatively short, and the torque transmission capacity of the V-belt continuously variable transmission was relatively small.

For the same reason, the contact area of the V-belt 6 with the pulleys 4 and 5 is small, and the force for clamping the V-belt 6 between the opposed flanges defining the pulley V-grooves of the pulleys 4 and 5 is increased. When an attempt is made to increase the torque transmission capacity, there is a problem that the surface pressure increases and the durability deteriorates.

In addition, the fact that the arc lengths (wrapping areas) α and β around which the V-belts are wound around the pulleys 4 and 5 is short, that the opposed flanges that define the pulley V-grooves of the pulleys 4 and 5 approach each other. Means that the opposed flange support rigidity in the direction is low, and these opposed flanges are easily inclined in a direction approaching each other in the area other than the V belt winding areas α and β, so that not only the pulleys 4 and 5 but also these It is also necessary to make the shaft for supporting the shaft high rigidity, which is disadvantageous in cost. These problems become more remarkable when the clamping force of the V-belt 6 is increased by increasing the torque transmission capacity as described above.

According to the first aspect of the present invention, the state of winding the V belt around both pulleys is improved.
It is an object of the present invention to propose a V-belt type continuously variable transmission which can solve any of the above problems.

According to a second aspect of the present invention, any of the above-mentioned problems can be solved by a winding state of a V-belt different from that of the first aspect, and the rotation directions of both pulleys are reversed. It is an object of the present invention to propose a V-belt type continuously variable transmission which does not require an idler gear for adjusting the rotation direction.

According to a third aspect of the present invention, there is provided a V-shaped belt which is advantageous for realizing the wound state of the V-belt as in the second aspect.
It is an object of the present invention to propose a V-belt type continuously variable transmission having a belt.

According to a fourth aspect of the present invention, any of the above-mentioned problems can be solved by a winding state of the V-belt different from the first and second aspects, and the entire length of the V-belt It is an object of the present invention to propose a V-belt type continuously variable transmission capable of achieving the effect of eliminating the need for an idler gear for adjusting the rotation direction as in the second aspect of the invention without making the length much longer.

A fifth aspect of the present invention is advantageous for realizing a state in which the V belt is wound as in the fourth aspect,
It is another object of the present invention to propose a V-belt-type continuously variable transmission including a V-belt in which the V-belt has a small twist even in the wound state.

A sixth aspect of the present invention is advantageous for realizing the state of winding the V-belt as in the fourth aspect.
It is another object of the present invention to provide a V-belt type continuously variable transmission including an assembling-type V-belt that can also generate deformation in the width direction of the V-belt required in the wound state.

[0014]

For this purpose, a V-belt type continuously variable transmission according to the first aspect of the present invention changes the speed ratio steplessly by changing the pulley V-groove width of a pair of pulleys around which a V-belt is wound. In the V-belt type continuously variable transmission, the V-belt is wound around the pair of pulleys in a headband shape where no intersection occurs, and a V-belt linear portion extending between the pair of pulleys is formed. At least one of the pulleys is provided with an idler pulley that is deformed toward a surface including the rotation axis of the pulleys.

The V-belt type continuously variable transmission according to the second invention is
In a V-belt type continuously variable transmission in which the speed ratio is changed steplessly by changing the pulley V-groove width of a pair of pulleys around which the V-belt is wound, the V-belt includes the rotation axes of the two pulleys. It winds around these two pulleys so that there exists one linear part which intersects the surface, and the rest of the V-belt extending between the ends of the winding area far from the linear part is wound on the winding area of both pulleys. An idler pulley that guides the vehicle so as to be able to enter and exit is provided.

A V-belt type continuously variable transmission according to a third aspect of the present invention
In the second invention, a V contacting the side wall of the pulley V groove.
On both sides of the belt, two symmetrical members in the height direction of the V-belt are provided.
A pulley V groove side wall contact surface is provided for each pulley.

A V-belt type continuously variable transmission according to a fourth aspect of the present invention
In a V-belt type continuously variable transmission in which the speed ratio is changed steplessly by changing the pulley V-groove width of a pair of pulleys around which the V-belt is wound, the V-belt includes the rotation axes of the two pulleys. It is characterized in that it is wound in a figure eight shape between these pulleys so that two linear portions intersecting with the surface exist.

A V-belt type continuously variable transmission according to a fifth aspect of the present invention
In the fourth invention, a V contacting the side wall of the pulley V groove.
On both sides of the belt, two symmetrical members in the height direction of the V-belt are provided.
A pulley V groove side wall contact surface is provided for each pulley, and the V belt is formed in a Mobius shape.

A V-belt type continuously variable transmission according to a sixth aspect of the present invention is
In the invention or the fifth invention, the V-belt is formed by assembling a number of blocks in contact with the pulley V-groove side wall into an endless shape by an endless band, and the V-belt is formed on both ends of the block in contact with the pulley V-groove side wall. Two pulley V groove side wall contact surfaces symmetrical in the height direction are formed, and the endless band can be deformed in the band width direction by laminating the endless ring element in the band width direction and band thickness direction. It is characterized by having done.

[0020]

According to the first invention, the V-belt type continuously variable transmission transmits and receives power between a pair of pulleys via a V-belt and changes the width of the pulley V-grooves of both pulleys to continuously change the speed ratio. Can be changed to By the way, in the first invention, the V-belt is wound around the pair of pulleys like a conventional one in a headband shape where no intersection occurs.
An idler pulley is provided for deforming at least one of the V-belt linear portions extending between the pair of pulleys toward a surface including the rotation axis of both pulleys. , The winding arc length of the V-belt (wrapping area) becomes longer, and the torque transmission capacity of the V-belt continuously variable transmission can be increased even under the same conditions.

Further, the contact area of the V-belt with both pulleys is increased by increasing the arc length (wrapping area) around which the V-belt is wound on both pulleys. Even if the torque transmission capacity is increased by increasing the torque, the surface pressure does not become so high as to be a problem, and the torque transmission capacity can be increased without deteriorating the durability which is a problem. it can.

In addition, as described above, V
The lengthening of the belt winding area means that the pulley V
This means that the opposing flange supporting rigidity in the direction in which the opposing flanges defining the groove approach each other is increased, and these opposing flanges are easily inclined in the direction approaching each other in a region other than the V belt winding region. Can be suppressed, and accordingly, not only the pulleys but also the shafts supporting them can be made to have low rigidity, which is very advantageous in cost. Since the idler pulley does not participate in power transmission, it only controls the V-belt guide,
It does not create strength problems on its own.

In the second invention, the V-belt is wound around the two pulleys so as to have one linear portion intersecting the plane including the rotation axes of the pulleys, and the V-belt is far from the linear portion. An idler pulley is provided to guide the remaining portion of the V-belt extending between the ends of the winding area so as to be able to enter and exit the winding area of both pulleys.
The one V-belt linear portion that intersects the plane including the rotation axes of both pulleys increases the arc length (wrapping area) around which the V-belt is wound on both pulleys. The torque transmission capacity of the transmission can be increased. In addition, since the single V-belt linear portion that transmits power between both pulleys during driving enters and exits the pulley without being guided by the idler pulley, it is possible to suppress the V-belt from colliding with the pulley. , Can improve durability.

Note that, as described above, V
By increasing the winding arc length (wrapping area) of the belt, the contact area of the V belt with both pulleys is increased as in the first invention, and the clamping pressure of the V belt in the pulley V groove is reduced. Even if the torque transmission capacity is increased by increasing the torque, the surface pressure does not become so high as to cause a problem, and the torque transmission capacity can be increased without deteriorating durability, which is a problem. . Further, by increasing the region where the V-belt is wound around both pulleys, as in the first invention, the opposing flange supporting rigidity in the direction in which the opposing flanges defining the pulley V-groove approach each other increases. In addition, the opposing flanges can be prevented from being easily inclined in a direction approaching each other in a region other than the region where the V-belt is wound, which is extremely advantageous in strength and cost.

In the second invention, the one V-belt linear portion intersecting the plane including the rotation axes of the two pulleys reverses the rotation directions of the two pulleys, and the idler gear for adjusting the rotation directions. And the size of the V-belt type continuously variable transmission can be reduced.

In the third invention, two pulley V-groove side wall contact surfaces symmetrical in the height direction of the V-belt are provided on both side surfaces of the V-belt in contact with the side wall of the pulley V-groove. This can be reliably realized even in the special V-belt winding state as in the second invention.

In the fourth invention, the V-belt is wound between the two pulleys in a figure-eight shape so that there are two linear portions intersecting the planes including the rotation axes of the two pulleys. The above 2 which intersects with the plane including the rotation axis of the pulley
The straight portion of the V-belt further extends the arc length (wrapping area) around which the V-belt is wound on both pulleys as compared with the second invention, and the torque transmission capacity of the V-belt type continuously variable transmission is increased even under the same conditions. It can be even larger.

As a result, similarly to the first invention, the contact area of the V-belt with both pulleys increases, and even if the clamping force of the V-belt in the pulley V-groove is increased to increase the torque transmission capacity, The pressure does not become so high as to be a problem, and the torque transmission capacity can be increased without deteriorating durability as a problem,
Since the opposed flange supporting rigidity in the direction in which the opposed flanges defining the pulley V-groove approach each other increases,
It is possible to prevent the opposing flanges from being easily inclined in a direction approaching each other in a region other than the region where the V-belt is wound, which is extremely advantageous in strength and cost.

When the V-belt is wound on the V-shaped belt, the rotation direction of both pulleys is reversed in the same manner as in the second invention. The size of the continuously variable transmission can be reduced, and the V-belt winding state of figure 8 can achieve the same operation and effect as the second invention without significantly increasing the total length of the V belt. This is advantageous.

In the fifth invention, two pulley V-groove side wall contact surfaces symmetrical in the height direction of the V-belt are provided on both side surfaces of the V-belt in contact with the side wall of the pulley V-groove, respectively.
In addition, since the V-belt is formed in a Mobius shape, it can be realized even when the special V-belt is wrapped as in the fourth invention, and the special V-belt is wrapped. In this case, the twist of the V-belt can be reduced.

In the sixth aspect of the present invention, the V-belt is formed by assembling a large number of blocks in contact with the side wall of the pulley V-groove by an endless band to form a V-belt. The endless band can be deformed in the band width direction by laminating the endless band in the band width direction and band thickness direction while forming two pulley V groove side wall contact surfaces symmetrical in the height direction. The special V
This can be realized even in the state where the belt is wound, and the deformation in the width direction of the V belt required in the state where the special V belt is wound can also occur. In this case, there is no possibility that the bending stress becomes large and power loss occurs.

[0032]

Embodiments of the present invention will be described below in detail with reference to the drawings. 3 and 4 show two embodiments of a V-belt type continuously variable transmission according to the present invention.
In the figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals. In the embodiment shown in FIGS. 3 and 4, the V-belt 6 has an intersection with the primary pulley 4 and the secondary pulley 5 as in the conventional V-belt type continuously variable transmission described above with reference to FIGS. Do not wrap it in a headband shape.

In the embodiment shown in FIG. 3, one of the linear portions of the V-belt 6 extending between the pulleys 4 and 5, which rotates in the direction of the arrow when the forward rotation is transmitted, is connected to the idler pulley 11.
, So that the one V-belt linear portion is separated from the pulleys 4 and 5 by ε from the tangent to the outer tangent of the arc of contact of the V-belt 6 with the pulleys 4 and 5. Is kept close to the surface. For this reason, the idler pulley 11 is rotatably supported on the free end of an arm 13 rotatable around a fixed shaft 12,
3 is urged by a spring 14 to push the idler pulley 11 to the outside of the one V-belt linear portion.

In the embodiment shown in FIG. 4, the other linear portion of the V-belt 6 extending between the pulleys 4 and 5 is also directed by the idler pulley 21 to a surface including the rotation axes of the pulleys 4 and 5. Then, the other V-belt linear portion is held closer to the above-mentioned surface than the tangent line of the arc of contact of the V-belt 6 with the pulleys 4 and 5. For this reason, the idler pulley 21 is rotatably supported on the free end of an arm 23 rotatable around a fixed shaft 22, and the arm 23 is biased by a spring 24 to rotate the idler pulley 21 to the other V-belt. Press outside the straight part.

In the embodiment shown in FIG. 3 or FIG. 4, the V-belt 6 is wound around the primary pulley 4 and the secondary pulley 5 in a headband shape as in the prior art. One or both of the existing V-belt linear portions are deformed by the idler pulleys 11 and 21 toward the plane including the rotation axes of the pulleys 4 and 5, so that the V-belt linear portions are deformed. As shown in FIG. 5 for the case of FIG. 4, the arc lengths (wrapping areas) δ and γ of the V belt 6 wound around the pulleys 4 and 5 become longer as is clear from the comparison with FIG. Even under the conditions, the torque transmission capacity of the V-belt type continuously variable transmission can be increased.

A V-belt 6 for both pulleys 4 and 5
, The contact area of the V-belt 6 with both pulleys 4 and 5 increases, and the clamping pressure of the V-belt 6 in the pulley V-groove increases. Thus, even if the torque transmission capacity is increased, the surface pressure does not become so high as to be a problem, and the torque transmission capacity can be increased without the problematic deterioration of durability.

In addition, as described above, the primary pulley 4
In addition, since the winding areas δ and γ of the V belt 6 around the secondary pulley 5 are lengthened, the opposing flange supporting rigidity in the direction in which the opposing flanges defining the pulley V groove approach each other increases, and these opposing flanges In the area other than the belt winding areas δ and γ, it is possible to suppress the inclination in the direction approaching each other. For this reason, not only the pulleys 4 and 5 but also the shafts supporting them can be made low in rigidity, which is very advantageous in cost. The idler pulleys 11 and 21
Does not contribute to power transmission because it only controls the guide of the V-belt 6, and therefore does not cause a problem in strength by itself.

FIG. 6 shows another embodiment of the present invention. In this embodiment, the V-belt 6 is formed by a single linear portion 6a intersecting with the plane including the rotation axis of the primary pulley 4 and the secondary pulley 5. Is wound between the pulleys 4 and 5 so that the pulley exists. Then, the remaining portion 6b of the V-belt 6 extending between the ends of the V-belt winding areas τ and θ of the pulleys 4 and 5 far from the V-belt linear portion 6a is separated by the idler pulleys 31 and 41 into the two pulleys 4 and 5. The V-belt is guided so as to be able to enter and exit the wrapping areas τ and θ.
For this reason, the idler pulleys 31 and 41 are rotatably supported on the free ends of the arms 33 and 43 rotatable around the fixed shafts 32 and 42, respectively.
At 44, the rotation is urged to generate V through the idler pulleys 31, 41.
The remaining portion 6b of the belt 6 is held in a tension state.

According to the structure of the present embodiment, the linear portion 6a of the V-belt 6 extending so as to intersect with the plane including the rotation axis of the primary pulley 4 and the secondary pulley 5 is arranged with the idler pulleys 31, 41. 2, the arc lengths (wrapping areas) τ and θ of the V belt 6 wound around the pulleys 4 and 5 become longer as is apparent from the comparison with FIG. The torque transmission capacity of the transmission can be increased. Moreover, the linear portion 6a of the V-belt 6, which transmits power between the pulleys 4 and 5 during driving, directly enters and exits the pulleys 4 and 5 without being guided by the idler pulley.
It is possible to prevent the V-belt 6 from hitting the pulleys 4 and 5 on one side, thereby improving durability.

The V-belt 6 for the pulleys 4 and 5
Increases the contact area of the V-belt 6 with both pulleys 4 and 5 and increases the clamping pressure of the V-belt 6 in the pulley V-groove. Thus, even if the torque transmission capacity is increased, the surface pressure does not become so high as to be a problem, and the torque transmission capacity can be increased without the problematic deterioration of durability. Further, as described above, since the arc lengths (wrapping areas) τ and θ of the V belt 6 wound around the pulleys 4 and 5 are long, the opposed flanges of the pulleys 4 and 5 defining the pulley V groove approach each other. This increases the opposing flange support stiffness in the direction in which the opposing flanges tend to incline toward each other in regions other than the V belt winding areas τ and θ, as in the above-described embodiment. It can be suppressed, which is very advantageous in strength and cost.

In the present embodiment, the linear portion 6a of the V-belt 6 extending so as to intersect the plane including the rotation axis of the pulleys 4 and 5 indicates the rotation direction of the pulleys 4 and 5 by arrows in the drawing. As shown in FIG. 1, the idler gear 7 for adjusting the rotation direction as described above with reference to FIG. 1 is not required, and the V-belt type continuously variable transmission has one less shaft as shown in FIG. It is possible to adopt a three-axis configuration, and it is also possible to realize a downsized V-belt continuously variable transmission.

In the present embodiment, when the V belt 6 is wound around the pulley, the V belt 6 comes into contact with the primary pulley 4 and the secondary pulley 5 on the front and back sides. The V belt 6 is configured as shown in FIGS. 8 (a) and 8 (b). In other words, the V-belt 6 is an assembling type V-belt in which a number of blocks 51 contacting the side walls of the pulley V-groove are assembled in an endless shape by endless bands 52, and the endless bands 52 are arranged in the band width direction of the endless ring element 53 and It is made of a laminate in the band thickness direction, and can be deformed not only in the band thickness direction but also in the band width direction.

Then, two pulley V-groove side wall contact surfaces 51a, symmetrical in the block height direction (pulley radial direction: vertical direction in FIG. 8) are provided at both ends of the block 51 in contact with the pulley V-groove side walls. 8B, one pulley V-groove side wall contact surface 51a is used for contacting the pulley V-groove side wall of the primary pulley 4 as shown in FIG. 8A, and the other pulley V-groove side wall contact surface 51b is formed. As shown in FIG. 8A, it is assumed that the side wall of the pulley V groove of the secondary pulley 5 comes into contact. By using a V-belt 6 provided with two pulley V-groove side wall contact surfaces 51a and 51b symmetrical in the height direction of the block at both ends of the block 51 in contact with the pulley V-groove side walls as described above, FIG. This can be reliably realized even in the state where the special V-belt 6 is wound around.

FIG. 9 shows still another embodiment of the present invention. In this embodiment, the V-belt 6 is provided with two V-belts 6 intersecting the planes including the rotation axes of the primary pulley 4 and the secondary pulley 5. It is wound around the pulleys 4 and 5 in a figure eight shape so that the straight portions 6c and 6d are present.

However, in this case, the two straight portions 6c, 6
Since d interferes with each other at the intersections, in order to prevent this, one linear portion 6c is offset from the other linear portion 6d by the offset pulley 61,
Further, since the V-belt 6 is turned upside down when the V-belt 6 is wound around the primary pulley 4 and the secondary pulley 5, the alignment pulley 6
At 2, the front and back of the straight line portion 6c with respect to the pulleys 4 and 5 are performed. As a result, the V-belt 6 is basically
As described above, the pulley contact surfaces 51a, 5
1b, the whole is formed into a single twisted Mobius shape as shown in FIG. 10 in consideration of the above-mentioned twist for back-to-back, as shown in FIG. Even when the V-shaped belt 6 is wound around the figure 8, the twist of the V-shaped belt 6 is reduced.

In this embodiment, both pulleys 4, 5
The two linear portions 6c and 6d of the V-belt 6 intersecting with the plane including the rotation axis of the V-belt 6 with respect to the pulleys 4 and 5 further than the embodiment shown in FIG. Therefore, the torque transmission capacity of the V-belt type continuously variable transmission can be further increased under the same conditions.

In the present embodiment, the contact area of the V belt 6 with the pulleys 4 and 5 is further increased by increasing the arc length (wrapping area) of the V belt 6 with respect to the pulleys 4 and 5. Therefore, even if the clamping force of the V-belt 6 in the pulley V-groove is increased to increase the torque transmission capacity, the surface pressure does not become so high as to become a problem, and the durability becomes a problem. The effect that the torque transmission capacity can be increased without deteriorating the torque can be achieved more reliably, and the opposing flange supporting rigidity in the direction in which the opposing flanges that define the pulley V-groove approach each other is further improved. As a result, the opposing flanges can be more reliably prevented from inclining in a direction approaching each other in a region other than the region where the V-belt is wound. Fine-cost on is more advantageous.

When the V-shaped belt 6 is wound around the figure eight as in the embodiment shown in FIG. 6, the rotation directions of the pulleys 4 and 5 are reversed as shown by arrows in FIG. As a result, the idler gear 7 for adjusting the rotation direction as described above with reference to FIG. 1 is not required, and the V-belt type continuously variable transmission can be formed into a three-shaft configuration having one less shaft as shown in FIG. As a result, the size of the V-belt type continuously variable transmission can be reduced. Further, the figure 8 winding state of the V belt 6 is advantageous in that the same operation and effect as in the embodiment shown in FIG. 6 can be achieved without significantly increasing the entire length of the V belt 6.

The V-belt 6 is an assembling V-belt as described above with reference to FIG. 8, and an endless band 52 for assembling a large number of blocks 51 into an endless shape is formed in a band width direction and a band thickness direction of an endless ring element 53. Since the V-belt 6 can be deformed not only in the band thickness direction but also in the band width direction, deformation in the width direction of the V-belt 6 can easily occur, as shown in FIG. Of the V-belt straight portion 6c of the other V
Even if the V-belt 6 is offset from the belt straight portion 6d to prevent interference, the V-belt 6 easily deforms in the width direction and
The bending stress in the width direction of the belt 6 does not increase, and the power loss accompanying the bending stress can be avoided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram schematically showing a transmission system of a conventional V-belt type continuously variable transmission.

FIG. 2 is an explanatory diagram showing a state in which a V-belt is bridged between a primary pulley and a secondary pulley of the V-belt continuously variable transmission.

FIG. 3 is an explanatory diagram showing a state in which a V-belt is bridged between a primary pulley and a secondary pulley of a V-belt type continuously variable transmission according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state of bridging a V-belt between a primary pulley and a secondary pulley of a V-belt type continuously variable transmission according to another embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a region where the V-belt is wound around a primary pulley and a secondary pulley of the V-belt type continuously variable transmission.

FIG. 6 is an explanatory diagram showing a V-belt bridging state between a primary pulley and a secondary pulley of a V-belt continuously variable transmission according to still another embodiment of the present invention.

FIG. 7 is a schematic diagram similar to FIG. 1, schematically showing a transmission system of the V-belt type continuously variable transmission shown in FIG. 6;

8A and 8B show a V-belt used in the embodiment of FIGS. 6 and 9, wherein FIG. 8A is a cross-sectional view showing the V-belt as a cross section taken along a plane perpendicular to the belt running direction, and FIG. FIG. 4 is a side view illustrating a part of the V-belt viewed from a side in a belt traveling direction.

FIG. 9 is an explanatory diagram showing a state of bridging a V-belt between a primary pulley and a secondary pulley of a V-belt continuously variable transmission according to still another embodiment of the present invention.

FIG. 10 is an overall perspective view of a V-belt used in the V-belt type continuously variable transmission according to the embodiment.

FIG. 11 is a schematic diagram similar to FIG. 1, schematically showing the transmission system of the V-belt type continuously variable transmission shown in FIG. 9;

[Explanation of symbols]

 Reference Signs List 1 engine 2 torque converter 3 forward / reverse switching mechanism 4 primary pulley 5 secondary pulley 6 V belt 7 idler gear 8 differential gear device 11 idler pulley 12 fixed shaft 13 arm 14 spring 21 idler pulley 22 fixed shaft 23 arm 24 spring 31 idler pulley 32 fixed Axis 33 Arm 34 Spring 41 Idler pulley 42 Fixed axis 43 Arm 44 Spring 51 Block 51a Pulley V groove side wall contact surface 51b Pulley V groove side wall contact surface 52 Endless band 53 Endless ring element 61 Offset pulley 62 Alignment pulley

Claims (6)

[Claims] 1. A V-belt type continuously variable transmission in which a gear ratio is steplessly changed by changing a pulley V-groove width of a pair of pulleys around which a V-belt is wound. Along with winding in a headband shape where no intersection occurs, at least one of the V-belt linear portions extending between the pair of pulleys,
A V-belt type continuously variable transmission, comprising an idler pulley that is deformed toward a surface including a rotation axis of both the pulleys. 2. A V-belt type continuously variable transmission wherein a speed ratio is steplessly changed by changing a pulley V-groove width of a pair of pulleys around which a V-belt is wound. Is wound around these two pulleys so that there is one linear portion intersecting with the plane including the rotation axis, and the remaining portion of the V-belt extending between the ends of the winding area far from the linear portion is attached to both pulleys. A V-belt type continuously variable transmission provided with an idler pulley that guides the vehicle so as to be able to enter and exit the winding area. 3. The pulley V-groove side wall contact surfaces symmetrical in the height direction of the V-belt are provided on both side surfaces of the V-belt in contact with the side wall of the pulley V-groove, respectively. A V-belt type continuously variable transmission characterized by the above-mentioned. 4. A V-belt-type continuously variable transmission in which a speed ratio is steplessly changed by changing a pulley V-groove width of a pair of pulleys around which a V-belt is wound. V-belt type continuously variable transmission characterized in that it is wound in an eight-shape between these pulleys so as to have two linear portions intersecting with a plane including the rotation axis. 5. The pulley V-groove side wall contact surfaces symmetrical in the height direction of the V-belt are provided on both side surfaces of the V-belt in contact with the side wall of the pulley V-groove, respectively.
A V-belt type continuously variable transmission, wherein the V-belt is formed in a Mobius shape. 6. The V-belt according to claim 4, wherein the V-belt is formed by assembling a plurality of blocks in contact with a pulley V-groove side wall into an endless shape using an endless band.
Two pulley V-groove side wall contact surfaces symmetrical in the block height direction are formed at both ends of the block in contact with the groove side wall, and the endless band is formed in the band width direction and band thickness direction of the endless ring element. A V-belt type continuously variable transmission characterized in that it is configured to be deformable also in a band width direction by a laminate of (1).