JP5915174B2 - Toroidal continuously variable transmission - Google Patents

Description

  The present invention relates to a toroidal type continuously variable transmission, and more particularly to a toroidal type continuously variable transmission that can be used in transmissions of various industrial machines.

The use of toroidal continuously variable transmissions as automotive transmissions has been described in many publications and is partly implemented and well known. 6 and 7 show a basic configuration of a toroidal-type continuously variable transmission currently being implemented. This toroidal-type continuously variable transmission is called a double-cavity type, and a pair of input-side discs 1 and 1 with respect to the input rotary shaft 2 are each a toroidal curved surface (concave arc-shaped concave surface) and patented. The input side inner side surfaces 3 and 3 corresponding to one side surface in the axial direction described in the claims are opposed to each other, and are supported concentrically and freely in synchronization with each other.

An output cylinder 5 having an output gear 4 fixed to the outer peripheral surface of the intermediate portion is supported around the intermediate portion of the input rotary shaft 2 so as to freely rotate with respect to the input rotary shaft 2. Further, a pair of output side disks 6 and 6 are supported at both ends of the output cylinder 5 so as to be rotatable in synchronization with the output cylinder 5 by spline engagement. In this state, each of the output side inner surfaces 7 and 7 of the output side disks 6 and 6, each of which is a toroidal curved surface and corresponding to one axial side surface recited in the claims, is the both input side inner side surfaces. 3 and 3 are opposed.

In addition, two power rollers 8 and 8 each having a spherical convex surface on each peripheral surface (cavity) between the input side and output side inner side surfaces 3 and 7 around the input rotation shaft 2 are provided. A total of four are arranged each. The power rollers 8 and 8 are respectively connected to the inner surfaces of the trunnions 9 and 9 via support shafts 10 and 10 whose base half and tip half are eccentric and a plurality of rolling bearings. Rotation about the front half of 10 and slight swing displacement about the base half of each of the support shafts 10 and 10 are supported freely. Each trunnion 9, 9 is provided with a tilt shaft 11 concentrically provided for each trunnion 9, 9 at both ends in the length direction (front and back direction in FIG. 6, vertical direction in FIG. 7). , 11 can be swung freely.

The operation of swinging (tilting) the trunnions 9 and 9 is performed by displacing the trunnions 9 and 9 in the axial directions of the tilt shafts 11 and 11 by hydraulic actuators 12 and 12. That is, at the time of shifting, the trunnions 9 and 9 are displaced in the axial direction of the tilt shafts 11 and 11 by supplying and discharging pressure oil to and from the actuators 12 and 12. As a result, the direction of the force acting in the tangential direction of the contact portion (traction portion) between the peripheral surface of each of the power rollers 8 and 8 and each of the input side and output side inner surfaces 3 and 7 changes (side slip occurs). Therefore, the trunnions 9, 9 are oscillated and displaced about the tilt shafts 11, 11.

During operation of the toroidal-type continuously variable transmission as described above, one input side disk 1 (left side in FIG. 6) is rotationally driven by a drive shaft 13 via a loading cam type pressing device 14. As a result, the pair of input-side disks 1 and 1 supported at both ends of the input rotation shaft 2 rotate synchronously while being pressed in a direction approaching each other. Then, this rotation is transmitted to the output side disks 6 and 6 through the power rollers 8 and 8 and is taken out from the output gear 4.

When the ratio of the rotational speeds of the input rotary shaft 2 and the output gear 4 is changed, and when the deceleration is first performed between the input rotary shaft 2 and the output gear 4, the trunnions 9 and 9 are shown in FIG. The power rollers 8 and 8 are swung to the positions shown in FIG. 3 so that the peripheral surfaces of the input side inner surfaces 3 and 3 of the input disks 1 and 1 and the output disks 6 and 6 are It is made to contact | abut to the outer peripheral side part of the output side inner surfaces 7, 7, respectively. On the contrary, when the speed is increased, the trunnions 9 and 9 are swung in the direction opposite to that in FIG. 6, and the peripheral surfaces of the power rollers 8 and 8 are input to the input disks 1 and 2. It is made to contact | abut to the outer periphery side part of the side inner side surfaces 3 and 3 and the center side part of the output side inner side surfaces 7 and 7 of the said output side discs 6 and 6, respectively. An intermediate speed ratio (transmission ratio) can be obtained between the input rotary shaft 2 and the output gear 4 by setting the swing angles of the trunnions 9 and 9 to an intermediate position.

As described above, the toroidal continuously variable transmission includes a mechanism in which a plurality of power rollers are combined between the traction surfaces of the input disk and the output disk, and the input disk is received by an input from a power source such as an engine. The rotating force is transmitted to the output disk via the power roller. The gear ratio can be set steplessly by controlling the inclination angle of the rotating shaft of the power roller and changing the contact position of the peripheral surface of the power roller with respect to the traction surfaces of the input disk and the output disk. At this time, the traction surface of the input and output disks and the peripheral surface of the power roller are pressed against each other by a strong pressing force in order to transmit power, and an oil film of traction oil supplied from the supply pump is formed on these contact surfaces. Is formed. However, when the toroidal-type continuously variable transmission stops for a long period of time, the traction oil forming the oil film may gradually fall due to the influence of gravity, resulting in an oil film running out state.

Therefore, Patent Document 1
In this case, an oil pool defining peripheral wall is fitted to the tilt shaft setting boss part on the lower side of the trunnion, and an oil pool is formed by the tilt shaft setting boss part and the oil pool defining peripheral wall, thereby causing seizure and heat generation. It is described that the above is prevented.

JP 2009-299789 A

However, when the oil accumulated in the oil sump is lifted and lubricated as in Patent Document 1, the power roller rotates in the oil sump, so that the rotational efficiency is lowered due to the stirring resistance, and the fuel consumption is deteriorated. There is a fear. At a low temperature, the stirring resistance further increases, and the engine startability may be deteriorated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a toroidal continuously variable transmission without adding parts and without causing deterioration of fuel consumption.

In order to achieve the above object, the toroidal continuously variable transmission according to claim 1 is concentric with each other in a state in which the respective one side surfaces in the axial direction, each of which is a toroidal curved surface having an arc cross section, are opposed to each other. And at least one pair of disks that are supported for relative rotation, and twisting with respect to the central axis of each disk at a plurality of positions in the circumferential direction between the axial side surfaces of each disk in the axial direction. A plurality of trunnions that are freely provided with swing displacement about the tilting shaft in position, and each of the trunnions is supported by each trunnion through a thrust rolling bearing so as to be rotatable, and each circumferential surface has a spherical convex surface. and a toroidal-type continuously variable transmission that includes a plurality of power rollers which respectively brought into contact in the axial direction one side of both disks, the outer peripheral portion of the power rollers, a recess Characterized in that plurality at predetermined intervals around the entire circumference of Kigaishu portion.

According to the toroidal-type continuously variable transmission of the present invention, the lubricating oil is stored in the recess provided in the outer peripheral portion of the power roller, so that even if the oil film runs out, even when the engine is restarted, the lubricating oil By supplying the toner quickly, it is possible to prevent burn-in and heat generation, prevent damage to the power roller and the disk, and improve durability.

The figure explaining the 1st Embodiment of this invention. The figure explaining the 1st Embodiment of this invention. The perspective view of the 1st Embodiment of this invention. The figure explaining the 2nd Embodiment of this invention. The perspective view of the 2nd Embodiment of this invention. The figure which shows an example of the conventional concrete structure. Sectional drawing in alignment with the AA of FIG.

  1 to 3 show a first embodiment of the present invention. The feature of the present invention is that the shape of the power roller is devised in order to prevent seizure or heat generation even when the traction surface of the disk or power roller is out of the oil film and restart the engine. Since the operation and operation are the same as those of the conventional configuration and operation described above, the following description will focus on the characteristic portions of the present invention, and the other portions will be denoted by the same reference numerals as in FIGS. I will just explain it briefly.

A plurality of recesses 15, 15 having a rectangular cross section are provided over the entire circumference of the outer peripheral surface on the large diameter side of the power roller 8 of the present embodiment. Further, as shown in FIG. 2, 16 lubricating oil holes are provided in a portion of the trunnion 9 facing the recesses 15, 15 with respect to the central axis direction of the trunnion 9.

In the case of this embodiment, lubricating oil is supplied from the actuator side (see FIG. 7) by a hydraulic pump (not shown) and the lubricating oil is discharged from the lubricating oil hole 16. As a result, when the engine is stopped and the power roller 8 is also stopped, lubricating oil accumulates in the recesses 15 and 15, and when the engine is restarted, the power roller 8 and the traction surface of the disc are , Lubricant can be supplied quickly.

Therefore, even if the power roller 8 rotates before the lubricating oil is supplied to the power roller 8 by starting the engine, the lubricating oil accumulated in the recesses 15 and 15 can be supplied to the traction surface, and lubrication is performed. It can be prevented from rotating in a state where the oil has run out, and the power roller 8 and the disc can be prevented from being seized and heated.

Further, when the power roller 8 is stopped, the lubricating oil that flows down around the power roller 8 may be accumulated in the recesses 15 and 15, and the lubricating oil hole 16 facing the recesses 15 and 15 may not be provided.

In addition, a rotation sensor, a displacement sensor, or the like may be installed on the trunnion 9 so as to face the recesses 15 and 15, and various state quantities may be detected using the recesses 15 and 15. Thereby, when detecting the rotation speed, it is possible to detect the synchronization failure or slip state of each power roller 8 and to quickly detect the occurrence of any failure.

4 and 5 show a second embodiment of the present invention. In the case of the second embodiment, the shape of the concave portion is different from that of the first embodiment. As in the first embodiment, a plurality of the recesses 17 and 17 in the second embodiment are provided over the entire circumference of the outer diameter surface of the large diameter side of the power roller 8. When viewed from the cross section in the direction, the concave portions 17 and 17 are trapezoidal.

As a result, the planes 18 and 16 facing the rotation direction of the power roller 8 constituting the recesses 17 and 17 are not perpendicular to the rotation direction but are inclined, and the circle when the power roller 8 is rotated. The circumferential stirring resistance can be reduced as compared with the first embodiment. Since other configurations and operations are the same as those in the first embodiment, a duplicate description is omitted.

DESCRIPTION OF SYMBOLS 1 Input side disk 2 Input rotating shaft 3 Input side inner surface 4 Output gear 5 Output cylinder 6 Output disk 7 Output side inner surface 8 Power roller 9 Trunnion 10 Support shaft 11 Tilt shaft 12 Actuator 13 Drive shaft 14 Press device 15 Recess 16 Lubricating oil hole 17 Recess 18 Flat

Claims (1)

At least one pair of discs that are concentrically supported by each other in a state in which one side surfaces in the axial direction, each of which is a toroidal curved surface having an arc-shaped cross section, are opposed to each other and freely rotatable relative to each other, and each of these discs in the axial direction. A plurality of trunnions provided freely at a plurality of locations in the circumferential direction between the side surfaces in the axial direction of the disc, with a swinging displacement centering on a tilting shaft located at a twisted position with respect to the central axis of each disk. And a plurality of power rollers each rotatably supported by each trunnion via a thrust rolling bearing and having a spherical convex surface that is in contact with one axial side surface of both disks. In the toroidal type continuously variable transmission provided,
A toroidal continuously variable transmission , wherein a plurality of recesses are provided at predetermined intervals along the entire circumference of the outer peripheral portion in the outer peripheral portion of the power roller.

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