JP5310114B2 - Continuously variable transmission - Google Patents

Description

  The present invention relates to a continuously variable transmission (CVT), and more particularly, to a continuously variable transmission in which a tooth attached to a pulley and a driving force transmitting means for transmitting a driving force mesh with each other.

  Conventionally, for example, a “continuously variable transmission mechanism” (see Patent Document 1) is known as a continuously variable transmission that transmits a rotational driving force using a V-belt.

  The conventional “continuously variable transmission mechanism” uses a V-belt between a pulley attached to a drive rotary shaft and a pulley attached to a driven rotary shaft in order to reliably transmit the rotational force using the V-belt. In a V-belt continuously variable transmission mechanism that transmits rotational driving force and at least one of the two pulleys is a variable pitch pulley, the V belt is a toothed V belt, and at least one of the variable pitch pulleys is V It has a gear which meshes with the teeth of the V belt at the groove bottom.

JP-A-63-120950

  However, in the conventional “continuously variable transmission mechanism”, the gear that meshes with the teeth of the V belt, which the variable pitch pulley has on the V groove bottom, is fixed to the shaft of the V groove bottom. If the teeth attached to the belt and the teeth of the V-belt are not sufficiently meshed, the pitches of both teeth do not match, which causes a situation where the teeth attached to the shaft repeatedly collide with the V-belt in a short time. It was inevitable.

  In other words, if the teeth installed on the shaft of the bottom of the V-groove of the variable pitch pulley and the driving force transmission means (V belt, chain, etc.) meshing with the teeth and transmitting the driving force do not coincide with each other, a deviation occurs. The coordinated movement of the two will be hindered, and depending on the situation, the teeth and the driving force transmission means may be damaged or the position of the teeth may be displaced.

  In the continuously variable transmission according to the present invention, the movable meshing portion that is in the advanced state with respect to the shaft portion of the pulley and meshes with the meshed portion of the driving force transmission means is disposed in the storage portion that opens on the driving force transmission means facing surface. The driving force transmission torque applied to the movable meshing portion is received by the highly rigid pulley shaft through the storage portion.

  According to the present invention, the movable meshing portion arranged in the storage portion enters the advanced state and meshes with the meshed portion of the driving force transmitting means, and the driving force transmitted to the movable meshing portion has high rigidity via the storage portion. Since it is received by the pulley shaft, the coordinated movement of the movable meshing part and the driving force transmission means is not hindered, and the teeth and the driving force transmission means are not damaged and the position of the teeth is not shifted. The lockup performance of the transmission can be exhibited without deteriorating.

It is explanatory drawing which shows typically the structure of the continuously variable transmission which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the state in which the chain is not wound around the pulley axis | shaft of the driven pulley of FIG. It is explanatory drawing which shows the state in which the chain is wound around the pulley axis | shaft of the driven pulley of FIG. It is explanatory drawing which shows the mounting state of the movable tooth of FIG. 1 in a pulley shaft radial direction cross section. FIG. 5 is an explanatory cross-sectional view showing an enlarged movable tooth mounting portion of FIG. 4. In order to compare with the configuration of the movable tooth and the movable tooth fixing component according to the present invention, a comparative example when the configuration of the movable tooth and the movable tooth fixed component according to the present invention is not applied is shown, and (a) is a comparative example FIG. 6 is an explanatory view showing the mounting state of the movable teeth in the pulley shaft radial cross section, and FIG. It is explanatory drawing which shows the mounting state of the movable tooth of the continuously variable transmission which concerns on 2nd Embodiment of this invention in the pulley shaft radial direction cross section. FIG. 8 is a cross-sectional explanatory view showing, in an enlarged manner, the movable tooth mounting portion of FIG. 7.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is an explanatory view schematically showing a configuration of a continuously variable transmission according to a first embodiment of the present invention. As shown in FIG. 1, the continuously variable transmission (CVT) 10 includes a drive pulley (primary pulley) 11 and a driven pulley (secondary pulley) 12, and a driving force hung between the drive pulley 11 and the driven pulley 12. It has a transmission means 13.

A cylindrical spacer (pulley shaft integrated member) 15 is attached to the pulley shaft 14 of the driven pulley 12 so that the pulley shaft 14 is inserted and integrated with the pulley shaft 14. A movable tooth fixing part (lock guide) 16 is mounted. A movable tooth (locking element) 17 that is a movable meshing portion is incorporated in the spacer 15 covered with the movable tooth fixing component 16, and the movable tooth 17 is restricted from moving in the pulley circumferential direction by the spacer 15. In addition, the movement in the pulley radial direction and the axial direction is restricted by the movable tooth fixing component 16.
The CVT 10 is provided in a vehicle, for example, and can change the traveling speed of the vehicle steplessly. In addition, although a belt, a chain, etc. are used as the driving force transmission means 13, the example using a chain as the driving force transmission means 13 is demonstrated here.

  A driving force input to the drive pulley 11 from an engine (not shown) as a driving source is transmitted to the driven pulley 12 via the chain 13 and is output from a driving shaft (not shown) of the driven pulley 12. Both the drive pulley 11 and the driven pulley 12 move the movable pulley relative to the fixed pulley to form a V-shaped cross-sectional groove (V groove) between the fixed pulley and the movable pulley and change the V groove width. Can do. Then, by continuously changing the V groove width of the drive pulley 11 which is the driving side and the driven pulley 12 which is the driving side, the transmission pitch of the chain 13 on the driving side and the driving side is changed, Thereby, a smooth stepless speed change can be performed.

  FIG. 2 is an explanatory view showing a state where no chain is wound around the pulley shaft of the driven pulley of FIG. FIG. 3 is an explanatory view showing a state where the chain is wound around the pulley shaft of the driven pulley of FIG. 1.

  As shown in FIGS. 2 and 3, a cylindrical movable tooth fixed component 16 mounted on the outer peripheral surface of the spacer so as to cover the spacer 15 includes a plurality of movable teeth that are movable in the radial direction of the movable tooth fixed component 16. 17 is incorporated. Each movable tooth 17 incorporated in the movable tooth fixed component 16 is projected so as to be retractable from the outer surface of the movable tooth fixed component 16 by an urging member 18 such as a coil spring, for example, and the pulley ratio of the CVT 10 is At the highest Hi (for example, overdrive: OD), it protrudes from the outer surface of the movable tooth fixing part 16 and engages with the chain 13 wound around the pulley shaft 14 (see FIG. 3).

  The movable teeth 17 are not limited to being arranged on the pulley shaft 14 of the driven pulley 12, but may be provided on the drive pulley 11. In this case, the movable teeth are fixed when the pulley ratio of the CVT 10 is at the lowest level. The part 16 protrudes from the outer surface of the part 16 and is engaged with the chain 13 wound around the pulley shaft 14 (see FIG. 3).

  The chain 13 is formed by connecting a thin ring-shaped chain link 19 in an annular shape using a pair of pins 20 in an overlapped state, and is connected with the pins 20 as connection shafts. Each chain link 19 rotates (swings) freely around the pin about the pin 20. Each chain link 19 has a concave portion (engaged portion) 19 a at the movable tooth contact portion on the side wound around the movable tooth 17. The recesses 19 a are formed corresponding to the protruding shape of the movable teeth 17 from the pulley shaft outer surface, and are arranged at a pitch that matches the pitch of the movable teeth 17.

  FIG. 4 is an explanatory view showing a mounting state of the movable tooth of FIG. 1 in a pulley shaft radial cross section. As shown in FIG. 4, the movable tooth 17 attached to the spacer 15 has a trapezoidal shape in the pulley shaft radial direction cross section, and is formed in a rectangular protrusion shape having a long upper surface in the pulley axis direction. It has an outward flange (hook) -like locking portion 17a protruding on both sides of the pulley shaft in the circumferential direction.

  The movable teeth 17 are arranged in a storage portion 21 provided in the spacer 15 with an urging member 18 interposed between the movable portion 17 and the storage portion bottom surface 21a. The storage portion 21 is formed in a groove shape that opens in the outer surface of the spacer (surface facing the driving force transmission means), which is a surface facing the chain 13 of the pulley shaft 14, and extends in the pulley shaft direction. The movable tooth 17 having the shape 17a has a shape and a size that can be stored in the embedded state. The movable teeth 17 arranged in the storage portion 21 have their tips positioned in the respective openings 16a penetrating the peripheral surface provided over the entire circumference of the movable tooth fixing component 16, and are formed on the outer surface of the spacer. On the other hand, it is possible to move in the radial direction of the pulley shaft so as to move forward and backward.

The movable teeth 17 arranged in the storage portion 21 are urged by the urging force of the urging member 18 so that the distal end protrudes upward from the outer peripheral surface of the movable tooth fixing component 16. When the pressure is applied, a retracted state in which the tip portion does not protrude from the outer peripheral surface of the movable tooth fixing component 16 against the urging force of the urging member 18 (see the broken line in the figure).
When the movable tooth 17 is in the projecting state, the upper surfaces of both the locking portions 17a and 17a of the movable tooth 17 are in contact with the back surface of the movable tooth fixing part 16, so that the upward movement of the movable tooth 17 is prevented. Be regulated.

The movable tooth fixing part 16 that regulates the upward movement of the movable tooth 17 has a column part 16b that protrudes downward at a substantially central portion in the pulley axial direction on the back surface. The storage unit 21 is in contact with the outer surface of the spacer 15.
The storage portion 21 is not limited to being formed on the spacer 15, and may be formed directly on the pulley shaft 14 without providing the spacer 15. In this case, the storage portion 21 opens on the outer surface of the pulley shaft 14 (the driving force transmission means facing surface).

  As described above, the movable teeth 17 arranged in the storage portion 21 provided on the spacer 15 (or the pulley shaft 14) integrated with the pulley shaft 14 are stored except when the pulley ratio of the CVT 10 is the highest and the lowest Lo. While being stored in the state of being embedded in the portion 21, when the pulley ratio of the CVT 10 is at least one of the highest and lowest times, that is, the chain 13 is wound around the pulley shaft 14 and positioned at the bottom of the V groove of the pulley. At this time, it jumps out of the storage portion 21 that has been arranged, enters an advanced state, and engages with the recess 19 a of the chain 13.

When the movable teeth 17 are engaged with the chain 13, a driving force transmission load (torque) is applied to the movable teeth 17.
FIG. 5 is an explanatory cross-sectional view showing the movable tooth mounting portion of FIG. 4 in an enlarged manner. As shown in FIG. 5, the movable tooth 17 to which a driving force transmission load (torque) t is applied in the pulley shaft circumferential direction in a state where the movable tooth 17 is engaged with the chain 13 is an end surface of the locking portion 17 a. The lower part is brought into contact with the spacer 15 (or pulley shaft 14) integrated with the pulley shaft 14 provided with the storage portion 21, and the spacer 15 (or pulley shaft 14) integrated with the pulley shaft 14 is The load from the locking portion 17a having the upper surface in contact with the back surface of the movable tooth fixing component 16 is received.
Therefore, the dimensional relationship between the movable tooth fixing component 16 and the movable tooth 17 is set to the following conditions.

(1) The pulley shaft circumferential length A of the column portion 16b of the movable tooth fixing part 16 is shorter than the pulley shaft circumferential length B of the outer surface of the spacer 15 between the adjacent storage portions 21 (A <B). (See FIG. 4).
By setting in this way, the movable tooth 17 comes into contact with the movable tooth fixing part 16 before coming into contact with the upper end of the storage portion 21 in which the movable tooth 17 is stored (the portion receiving the load, see FIG. 5). Can be prevented. As a result, when a driving force transmission load (torque) t is applied to the movable tooth 17, the movable tooth 17 comes into contact with the storage portion 21 and does not come into contact with the movable tooth fixing component 16. The pitch shift of the movable teeth 17 (see paragraph numbers 0028 and 0029) can be prevented.

As a result, a situation in which the teeth attached to the shaft are repeatedly caused to collide with the V-belt in a short time due to pitch deviation does not occur, so that the driving force is reliably transmitted and the driving force transmitting means is damaged. There is nothing.
(2) The distance a between the end face of the movable tooth fixing part 16 on the opening 16a side and the boundary portion of the engaging portion 17a of the movable tooth 17 protruding from the opening 16a is defined as the spacer of the opening 16a side wall surface of the spacer 15 and the engaging portion 17a. 15 longer than the distance b from the side wall surface (a> b) (see FIG. 4).
By setting in this way, the same effect as in the case (1) (A <B) can be obtained.

(3) The distance L1 between the engaging portions 17a of the adjacent movable teeth 17 protruding from the opening 16a is greater than the distance L2 between the adjacent openings 16a on the outer peripheral surface of the movable tooth fixing component 16 positioned between the adjacent movable teeth 17. Longer (L1> L2) (see FIG. 4).
By setting in this way, the movable tooth fixing component 16 located between the adjacent movable teeth 17 and 17 receives the driving force transmission load (torque) t applied to the adjacent movable teeth 17 and 17. It can be prevented from becoming a force.

(4) The upper surface of the movable tooth 17 that is embedded in the storage portion 21 and does not protrude from the outer peripheral surface of the movable tooth fixing component 16 and the tip end side protrude from the storage portion 21 and protrude from the outer peripheral surface of the movable tooth fixing component 16. The moving distance H1 from the upper surface of the movable tooth 17 is embedded in the storage portion 21 and the lower end surface of the movable tooth 17 that does not protrude from the outer peripheral surface of the movable tooth fixing component 16 and the distal end side from the storage portion 21 The distance is shorter than the moving distance H2 from the lower end surface of the movable tooth 17 protruding and projecting from the outer peripheral surface of the movable tooth fixing component 16 (see FIG. 4).

By setting in this way, the height (the pulley shaft radial direction length) of the movable teeth 17 arranged in the storage portion 21 is equal to or less than the distance from the bottom surface 21a of the storage portion 21 to the outer peripheral surface of the movable tooth fixing component 16. The movable teeth 17 that are embedded in the storage portion 21 are securely stored without protruding outside the movable tooth fixing component 16.
Here, a case where the movable tooth 17 comes into contact with the movable tooth fixing component 16 when a driving force transmission load (torque) t is applied to the movable tooth 17 will be described.

  FIG. 6 shows a comparative example when the configuration of the movable tooth and the movable tooth fixing component according to the present invention is not applied in order to compare the configuration of the movable tooth and the movable tooth fixing component according to the present invention. (A) is an explanatory view showing a mounting state of a movable tooth in a comparative example in a pulley axial radial section, and (b) is an explanatory cross-sectional view showing an enlarged movable tooth mounting part of (a).

  In the comparative example in which the configuration of the movable tooth and the movable tooth fixing part according to the present invention shown in FIG. 6 is not applied, when the movable tooth 1 transmits the driving force of the chain (not shown), the driving force The movable tooth fixed component 2 directly receives the transmission load (torque) t (see (b)). For this reason, if the rigidity of the movable tooth fixing component 2 is low, the movable tooth fixing component 2 is deformed, and this deformation causes a pitch shift of the movable tooth 1. When the pitch shift of the movable tooth 1 occurs, the original lockup performance in the continuously variable transmission having such a configuration of the movable tooth 1 and the movable tooth fixing component 2 is deteriorated.

  On the other hand, in order to increase the rigidity of the movable tooth fixing part 2, if the thickness of the whole movable tooth fixing part is increased or a high-strength material is used, the size and weight of the component parts increase and the weight becomes compact. Not only can it not be made, but also an increase in cost cannot be avoided.

  On the other hand, in the continuously variable transmission 10 according to the present invention, as shown in FIG. 4, the movable tooth 17 has a storage portion provided in the spacer 15 (or the pulley shaft 14) integrated with the pulley shaft 14. Therefore, the driving force transmission torque applied to the movable tooth 17 is integrated with the highly rigid pulley shaft 14 via the storage portion 21 (or the highly rigid pulley shaft 14 itself). Therefore, the pitch shift of the movable teeth 17 can be reliably prevented. Therefore, the coordinated movement of the movable teeth 17 and the chain 13 is not hindered, and the teeth (movable teeth 17) and the chain 13 are not damaged and the positions of the teeth are not shifted. The lockup performance provided can be reliably exhibited without deteriorating.

  As described above, by setting the dimensional relationship between the movable tooth fixing component 16 and the movable tooth 17 to the conditions (1) to (4), the driving force transmission torque applied to the movable tooth 17 is reliably integrated with the pulley shaft 14. It can be received by the spacer 15 (or the pulley shaft 14). In addition, it is possible to reliably perform a gear shift other than when receiving the driving force transmission torque (that is, when the pulley ratio of the CVT 10 is at least one of the highest level and the lowest level).

  The movable tooth fixing component 16 may have a free structure in which the rotation direction on the spacer 15 (or the pulley shaft 14) integrated with the pulley shaft 14 can be either forward or reverse. Since the movable tooth fixing component 16 does not need to be restricted in the rotational direction only by positioning the movable tooth 17 at a predetermined position, the shape can be simplified by using a free structure, and the manufacturing cost can be reduced. it can.

(Second Embodiment)
FIG. 7 is an explanatory view showing the mounting state of the movable teeth of the continuously variable transmission according to the second embodiment of the present invention in a pulley shaft radial cross section. FIG. 8 is a cross-sectional explanatory view showing the movable tooth mounting portion of FIG. 7 in an enlarged manner.

  As shown in FIGS. 7 and 8, the continuously variable transmission 30 according to the second embodiment includes a movable tooth fixing component 31 that is not provided with a column portion 16b in place of the movable tooth fixing component 16, and a spacer. Instead of 15, a spacer 32 corresponding to the movable tooth fixing component 31 and having a spacer outer surface in which the height of the spacer outer surface is increased by a length corresponding to the column portion 16b (length in the pulley shaft radial direction is increased) is provided. Other configurations and operations are the same as those of the continuously variable transmission 10 according to the first embodiment.

The spacer 32 is provided with a plurality of storage portions 33, and the outer surface of the spacer 32 between the adjacent storage portions 33 is the pulley shaft circumference on the back surface of the movable tooth fixing component 31 that restricts the upward movement of the movable teeth 17. It is in contact with the approximate center of the direction.
The storage portion 33 provided in the spacer 32 (or the pulley shaft 14) integrated with the pulley shaft 14 is the depth of the storage portion 21 of the continuously variable transmission 10 according to the first embodiment (the length in the pulley shaft radial direction). The distance from the storage portion bottom surface 33a to the back surface of the movable tooth fixing component 31 where the movable teeth 17 projecting through the opening 31a contact the upper surfaces of the locking portions 17a and 17a is as follows. It is the same as the continuously variable transmission 10 according to the first embodiment, unchanged from the storage unit 21.

The dimensional relationship between the movable tooth fixing part 31 and the movable tooth 17 having such a configuration excludes (1) in the case of the continuously variable transmission 10 according to the first embodiment, that is, (A <B), (2) That is, the conditions are set to (a> b), (3), that is, (L1> L2), and (4), that is, (H1 <H2).
As a result, the movable tooth 17 to which the driving force transmission load (torque) t is applied in the pulley shaft circumferential direction in a state where the movable tooth 17 is engaged with the chain 13 is not only the lower end surface of the locking portion 17a. The entire end face of the locking portion 17a is brought into contact with the spacer 32 (or the pulley shaft 14) provided with the storage portion 33 and integrated with the pulley shaft 14, and the spacer 32 (integrated with the pulley shaft 14). Alternatively, the pulley shaft 14) receives a load from the locking portion 17a whose upper surface is in contact with the back surface of the movable tooth fixing component 31.

As a result, the area of the portion that receives the driving force transmission load (torque) t added to the movable tooth 17 is larger than that of the storage portion 21 of the continuously variable transmission 10 according to the first embodiment. 17 can be reliably prevented, and the lockup performance of the continuously variable transmission 30 can be reliably exerted without deteriorating.
Moreover, since the movable tooth fixed component 31 is not provided with the column portion 16b of the movable tooth fixed component 16, it can be made a simplified structure as compared with the movable tooth fixed component 16, and thus can be easily manufactured.

  According to the present invention, when the speed change region of the continuously variable transmission is at least one of the highest level and the lowest level, the movable meshing portion arranged in the storage portion is in the advanced state and meshes with the meshed portion of the driving force transmitting means. Since the driving force transmitted to the movable meshing portion is received by the highly rigid pulley shaft via the storage portion, the coordinated movement of the movable meshing portion and the driving force transmitting means is not hindered, and the teeth and the driving force transmitting means are Since it is not damaged or the position of the tooth is not shifted, the lockup performance of the continuously variable transmission can be exerted without deteriorating, which is optimal for the continuously variable transmission.

DESCRIPTION OF SYMBOLS 10, 30 Continuously variable transmission 11 Drive pulley 12 Driven pulley 13 Chain 14 Pulley shaft 15, 32 Spacer 16, 31 Movable tooth fixed parts 16a, 31a Opening 16b Column part 17 Movable tooth 17a Locking part 18 Energizing member 19 Chain link 19a Concave part 20 pin 21,33 storage part 21a, 33a storage part bottom face

Claims (3)

A continuously variable transmission that transmits the rotational driving force of one pulley to the other pulley by a driving force transmitting means that is wound between two pulleys that can both change the pulley groove width,
A meshed portion provided on a pulley winding side of the driving force transmitting means;
A pulley shaft radius that is open to a driving force transmitting means facing surface that faces the driving force transmitting means and that can be moved forward and backward with respect to the driving force transmitting means facing surface in a storage portion provided on a pulley shaft or a pulley shaft integrated member. And a movable meshing portion that is located in the storage portion and is in an advanced state and meshes with the meshed portion when the shift region is at least one of the highest and lowest times. Transmission device. Yes Doha fixed part, continuously variable transmission according to claim 1 having a normal and reverse any direction possible free configuration the rotation direction of the driving force transmitting means opposing face. Each dimensional relationship between the movable tooth and the movable tooth fixed component is
The pulley shaft circumferential direction length A at the contact portion of the movable tooth fixing part with the driving force transmission means facing surface is shorter than the pulley shaft circumferential direction length B of the driving force transmission means facing surface,
The distance a between the end face of the movable tooth fixing part and the engaging part boundary part of the movable tooth protruding from the movable tooth fixing part is set to the opening side wall surface of the driving force transmitting means facing surface and the driving of the engaging part. Longer than the distance b between the force transmission means facing surface side wall surface,
The distance L1 between the locking tooth boundary portions of the movable teeth adjacent to protrude from the opening of the movable tooth fixing component is longer than the distance L2 between the outer peripheral surface adjacent openings of the movable tooth fixing component,
And the upper surface of the movable teeth do not protrude from the movable tooth fixing part, the moving distance H1 between upper surface of the movable tooth projecting from said movable tooth fixing part, and a bottom surface of the storage portion, the movable teeth fixing component The continuously variable transmission according to claim 1 or 2, wherein the continuously variable transmission is set to be shorter than a moving distance H2 with respect to a lower end surface of the movable tooth protruding from the front.

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