JP2011127630A - Toroidal type continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toroidal type continuously variable transmission which efficiently cools a roller even when reducing a flow rate of lubricating oil, and reduces a pump loss. <P>SOLUTION: The roller 11 is covered with a cover 51. The cover 51 has a side wall 51a facing the side surface of the roller 11. The inner surface of the side wall 51a is provided with three concentric grooves 55. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a toroidal continuously variable transmission used for, for example, an automatic transmission of an automobile.

  Conventionally, as a toroidal type continuously variable transmission, an input disk, an output disk disposed coaxially with the input disk, a roller for transmitting torque between the input disk and the output disk, Some include a carriage that supports a roller (see JP 2006-266313 A: Patent Document 1).

  The carriage is provided with a cover that exposes a part including the torque transmission region of the roller and covers a part of the side surface of the roller. The inner surface of the side wall of the cover facing the side surface of the roller with a gap is formed flat.

  Lubricating oil is supplied to the side surface of the roller from the vicinity of the shaft portion of the roller. This lubricating oil moves to the outer peripheral side of the roller by the centrifugal force of the roller while contacting the inner surface of the side wall of the cover and the side surface of the roller, thereby cooling the roller.

  However, in the conventional toroidal-type continuously variable transmission, the inner surface of the side wall of the cover is formed flat, so that the lubricating oil supplied from the vicinity of the roller shaft to the side surface of the roller is not subjected to centrifugal force of the roller. As a result, the roller is instantaneously blown to the outer peripheral side of the roller along the flat inner surface of the side wall of the cover.

  For this reason, the time for the lubricant to contact the side surface of the roller is shortened, and the time for the heat of the roller to be transmitted to the lubricant is shortened. As a result, it is necessary to increase the flow rate of the lubricating oil to cool the roller, and there is a problem that the pump loss increases.

JP 2006-266313 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a toroidal continuously variable transmission that can cool a roller efficiently even if the flow rate of lubricating oil is reduced, and has a small pump loss.

In order to solve the above problems, a toroidal continuously variable transmission of the present invention is
An input disk, an output disk disposed coaxially with the input disk, a roller for transmitting torque between the input disk and the output disk, and a roller that is rotatable and swingable via a shaft In a toroidal type continuously variable transmission having a carriage that supports it,
A cover that exposes a part including the torque transmission region of the roller and covers a part of a side surface of the roller is provided on the carriage,
A groove portion extending in a direction crossing the radial direction of the roller is provided on the inner surface of the side wall of the cover that faces the side surface of the roller with a gap.

  According to the toroidal type continuously variable transmission of the present invention, since the groove portion extending in the direction intersecting the radial direction of the roller is provided on the inner surface of the side wall of the cover, When the lubricating oil supplied to the side surface moves to the outer peripheral side of the roller by the centrifugal force of the roller, it enters the groove portion of the cover and temporarily stays there. The lubricating oil staying in the groove continues to contact the side surface of the roller during that time.

  Thus, by letting the lubricating oil enter the groove portion of the cover, it is possible to suppress the lubricating oil from being instantaneously blown to the outer peripheral side of the roller, and to increase the time for the lubricating oil to contact the side surface of the roller. The time for heat to be transferred to the lubricating oil is increased.

  Therefore, even if the flow rate of the lubricating oil is reduced, the roller can be efficiently cooled, and a toroidal continuously variable transmission with a small pump loss can be realized.

  Moreover, in the toroidal type continuously variable transmission of one embodiment, there are a plurality of the groove portions, and the plurality of groove portions are arranged concentrically.

  According to the toroidal type continuously variable transmission of this embodiment, since the plurality of grooves are arranged concentrically, all the grooves intersect substantially perpendicularly to the radial direction of the roller. For this reason, the lubricating oil moved by the centrifugal force of the roller tends to stay in the groove. Therefore, the roller can be cooled more efficiently. Moreover, the formation of the groove is simplified.

  Moreover, in the toroidal type continuously variable transmission of one embodiment, the material of the cover is aluminum.

  According to the toroidal type continuously variable transmission of this embodiment, since the material of the cover is aluminum, the thermal conductivity of the cover can be increased. For this reason, the lubricating oil that has received heat from the roller is cooled by being deprived of heat by the cover. Therefore, the lubricating oil can remove heat from the roller without accumulating heat and cool the roller more efficiently.

  According to the toroidal type continuously variable transmission of the present invention, since the groove portion extending in the direction intersecting the radial direction of the roller is provided on the inner surface of the side wall of the cover, the flow rate of the lubricating oil is reduced. However, the roller can be efficiently cooled, and a toroidal continuously variable transmission with a small pump loss can be realized.

It is a simplified lineblock diagram showing one embodiment of a toroidal type continuously variable transmission of the present invention. It is a top view of a roller and a carriage. It is XX sectional drawing of FIG. It is a principal part enlarged view of FIG. It is a top view which shows the other shape of the groove part of the side wall of a cover. It is a top view which shows another shape of the groove part of the side wall of a cover.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a simplified configuration diagram showing an embodiment of a toroidal continuously variable transmission according to the present invention. This toroidal-type continuously variable transmission is disposed between a first input disk 1 and a second input disk 2 fixed to an input shaft 3, and between the first input disk 1 and the second input disk 2, and The second input disks 1 and 2 are provided with an output disk 5 that can be rotated coaxially and independently.

  The output disk 5 is rotatably supported by a bearing (not shown) with respect to the input shaft 3 so that power is taken out to the output side by a toothed belt 6 wound around the gear portion 5A of the output disk 5. It has become.

  One surface of the first input disk 1 has a toroidal concave curved surface circumferential track 1a. One surface of the second input disk 2 has a toroidal concave curved surface circumferential track 2a. Both sides of the output disk 5 have toroidal concave curved surfaces 5a and 5b.

  The circumferential track 1a of the first input disk 1 and one circumferential track 5a of the output disk 5 are arranged to face each other. The circumferential track 2a of the second input disk 2 and the other circumferential track 5b of the output disk 5 are arranged to face each other.

  Between the circumferential track 1a of the first input disk 1 and one circumferential track 5a of the output disk 5, and the circumferential track 2a of the second input disk 2 and the other circumference of the output disk 5. A disk-shaped roller 11 is arranged between each of the tracks 5b.

  An oil film of lubricating oil is formed between the circumferential surface of one roller 11 and the circumferential track 1a of the first input disk 1 and between the circumferential surface of one roller 11 and the circumferential track 5a of the output disk 5. The lubricating oil is interposed between the circumferential surface of the other roller 11 and the circumferential track 2a of the second input disk 2 and between the circumferential surface of the other roller 11 and the circumferential track 5a of the output disk 5. The oil film is interposed. The roller 11 transmits torque between the first and second input disks 1 and 2 and the output disk 5 through an oil film of lubricating oil.

  When the input shaft 3 rotates, the first and second input disks 1 and 2 rotate together, and the roller 11 rotates following the rotation of the first and second input disks 1 and 2. The output disk 5 rotates following the rotation 11.

  The roller 11 has a shaft portion 12 that intersects the input shaft 3. The shaft portion 12 is controlled so that the inclination angles θ1 and θ2 of the pair of rollers 11 and 11 arranged with the output disk 5 interposed therebetween are symmetrical with respect to the output disk 5 interposed therebetween.

  Regarding the inclination angle of the roller 1 with respect to the direction parallel to the input shaft 3, the reduction ratio becomes larger as the inclination angle θ1 when the peripheral surface of the roller 11 faces the outer peripheral side of the output disk 5 and the inner peripheral side of the input disk 1 is larger. On the other hand, the greater the inclination angle θ2 when the peripheral surface of the roller 11 faces the inner peripheral side of the output disk 5 and the outer peripheral side of the input disk 1, the greater the speed increasing ratio.

  As shown in FIGS. 2 and 3, the roller 11 is supported by the carriage 50 via the shaft portion 12 so as to be rotatable and swingable.

  The carriage 50 includes an arm 52 that supports the shaft portion 12 via a bearing, and a cover 51 that is fixed to the arm 52 and covers the roller 11.

  The arm 52 tilts the roller 11 together with the cover 51 at a predetermined angle with respect to the input shaft 3.

  The cover 51 has side walls 51 a and 51 a that face each other on both side surfaces of the roller 11 with a gap, and a peripheral wall 51 b that faces the circumferential surface of the roller 11 with a gap. The cover 51 is formed of a combination of two dish-shaped members that cover both side surfaces of the roller 11.

  The side wall 51a and the peripheral wall 51b expose areas including the torque transmission areas A1 and A2 of the roller 11. The torque transmission areas A1 and A2 are areas where the roller 11 transmits torque to the first and second input disks 1 and 2 and the output disk 5.

  A supply path 60 for supplying lubricating oil is formed between the cover 51 and the arm 52. The supply path 60 is provided between the inner surface of the side wall 51 a and the side surface of the roller 11 through a first hole 61 formed between the inner periphery of the side wall 51 a of the cover 51 and the shaft portion 12 of the roller 11. It communicates with the first gap S1 and communicates with the second gap S2 between the inner surface of the peripheral wall 51b and the side surface of the roller 11 through the second hole 62 formed in the peripheral wall 51b of the cover 51.

  Then, lubricating oil is supplied from a pump (not shown) to the supply path 60 as shown by the arrow in FIG. Lubricating oil in the supply path 60 is supplied to the side surface of the roller 11 from the first hole portion 61 near the shaft portion 12 of the roller 11 and is also supplied to the peripheral surface of the roller 11 from the second hole portion 62. .

  The lubricating oil supplied to the side surface of the roller 11 cools the roller 11 while moving to the outer peripheral side of the roller 11 by the centrifugal force of the roller 11. Further, the lubricating oil reaching the outer periphery of the roller 11 and the lubricating oil supplied to the peripheral surface of the roller 11 are between the input disks 1 and 2 and the roller 11 and between the output disk 5 and the roller 11. To form an oil film. The input disks 1 and 2, the roller 11, and the output disk 5 transmit power in the torque transmission areas A 1 and A 2 through the oil film of the lubricating oil. The lubricating oil cools the input disks 1 and 2, the roller 11, and the output disk 5 and prevents their wear.

  On the inner surface of the side wall 51 a of the cover 51 on the side surface side of the roller 11, a groove portion 55 extending in a direction intersecting with the radial direction of the roller 11 is provided. In this embodiment, there are three groove portions 55, and the three groove portions 55 are arranged concentrically around the shaft portion 12 of the roller 11.

  A partition wall 56 is formed between the adjacent grooves 55 and 55. The groove part 55 is formed by press work, for example. The distance between the bottom of the groove 55 and the side surface of the roller 11 is, for example, 1 mm, and the distance between the partition wall 56 and the side surface of the roller 11 is, for example, 0.5 mm.

  Next, the operation of the toroidal continuously variable transmission configured as described above will be described.

  As shown in FIG. 4, the lubricating oil supplied from the vicinity of the shaft portion 12 of the roller 11 to the side surface of the roller 11 contacts the inner surface of the side wall 51 a of the cover 51 and the side surface of the roller 11 while It moves to the outer peripheral side of the roller 11 by force. The flow of the lubricating oil is indicated by solid line arrows in FIG.

  At this time, the lubricating oil hits the partition wall 56 and enters the groove 55 to temporarily stay there. The lubricating oil staying in the groove 55 continues to contact the side surface of the roller 11 during that time. In this way, by allowing the lubricating oil to enter the groove portion 55 of the cover 51, it is possible to prevent the lubricating oil from being instantaneously blown to the outer peripheral side of the roller 11, and to increase the time during which the lubricating oil contacts the side surface of the roller 11. Thus, the time during which the heat of the roller 11 is transmitted to the lubricating oil becomes longer.

  Therefore, even if the flow rate of the lubricating oil is reduced, the roller 11 can be efficiently cooled, and a toroidal continuously variable transmission with a small pump loss can be realized.

  Further, since the groove portions 55 are arranged concentrically, all the groove portions 55 intersect with the radial direction of the roller 11 substantially perpendicularly. For this reason, the lubricating oil moved by the centrifugal force of the roller 11 tends to stay in the groove portion 55. Therefore, the roller 11 can be cooled more efficiently. Further, the formation of the groove 55 is simplified.

  By making the material of the cover 51 aluminum, the thermal conductivity of the cover 51 can be increased. For this reason, the lubricating oil that has received heat from the roller 11 is cooled by being deprived of heat by the cover 51. Therefore, the lubricating oil takes heat from the roller 11 without accumulating heat, and can cool the roller 11 more efficiently.

  Next, another shape of the groove will be described.

  As shown in FIG. 5A, the groove portion 55A of the side wall 51a of the cover 51 is formed in a spiral shape. The spiral direction from the shaft portion 12 of the roller 11 toward the outer peripheral side of the roller 11 in the groove portion 55 </ b> A is formed to be opposite to the rotation direction (indicated by an arrow) of the roller 11. By doing in this way, the time for the lubricating oil to follow the rotation of the roller 11 and reach the outer peripheral side of the roller 11 can be lengthened. Therefore, the roller 11 can be cooled more efficiently. The spiral direction of the groove 55A may be opposite to that shown in FIG. 5A. Further, as shown in FIG. 5B, the groove portion 55B of the side wall 51a of the cover 51 may be formed in a spiral shape.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the number of the rollers 11, the input disks 1 and 2, and the output disk 5 can be freely increased or decreased. Further, the number of the grooves 55, 55A, 55B can be freely increased or decreased. The grooves 55, 55 </ b> A, 55 </ b> B may have any shape as long as they extend in a direction intersecting the radial direction of the roller 11.

  Further, the cover 51 may be formed so that the peripheral wall 51b is omitted and a part including the torque transmission regions A1 and A2 of the roller 11 is exposed and a part of the side surface of the roller 11 is covered. .

DESCRIPTION OF SYMBOLS 1 1st input disk 2 2nd input disk 3 Input shaft 5 Output disk 6 Toothed belt 11 Roller 12 Shaft part 50 Carriage 51 Cover 51a Side wall 51b Peripheral wall 52 Arm 55, 55A, 55B Groove part 56 Partition 61 First hole part 62 First 2 holes S1 1st clearance S2 2nd clearance A1, A2 Torque transmission area

Claims (3)

An input disk, an output disk disposed coaxially with the input disk, a roller for transmitting torque between the input disk and the output disk, and a roller that is rotatable and swingable via a shaft In a toroidal type continuously variable transmission having a carriage that supports it,
A cover for exposing a part of the roller including the torque transmission region and covering a part of the side surface of the roller is provided on the carriage;
A toroidal continuously variable transmission, characterized in that a groove extending in a direction intersecting the radial direction of the roller is provided on the inner surface of the side wall of the cover that faces the side surface of the roller with a gap. The toroidal continuously variable transmission according to claim 1,
There are a plurality of the grooves,
The toroidal continuously variable transmission characterized in that the plurality of grooves are arranged concentrically. The toroidal type continuously variable transmission according to claim 1 or 2,
A toroidal continuously variable transmission, wherein the cover is made of aluminum.

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