JP2005308166A - Toroidal type continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toroidal type continuously variable transmission capable of consistently and efficiently feeding lubricating oil to a cam surface of a loading cam and a roller, and preventing degradation of the efficiency caused by losses of a pump. <P>SOLUTION: The toroidal type continuously variable transmission comprises a first lubricating oil feeding means to feed lubricating oil for a bearing 30 between an end 1a of an input shaft 1 and a loading cam 12a, and a second lubricating oil feeding means in which lubricating oil stored between the end 1a of the input shaft 1 and the loading cam 12a flows to cam surfaces 113, 114 and a rolling element 12b through a space c formed between the loading cam 12a and an input side disk 2 by adjusting the space between the end 1a of the input shaft 1 and the loading cam 12a so that the discharge amount of lubricating oil discharged from the space between the end 1a of the input shaft 1 and the loading cam 12a is smaller than the feed amount of lubricating oil fed by the first lubricating oil feeding means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a toroidal continuously variable transmission that can be used for transmissions of automobiles and various industrial machines.

  FIG. 5 shows an example of a conventional toroidal continuously variable transmission that can be used as a transmission for an automobile. This toroidal type continuously variable transmission is a so-called double cavity type high torque toroidal type continuously variable transmission. Two input side disks 2 and 2 and two output side disks 3 and 3 are connected to the input shaft 1. It is attached to the outer periphery. An output gear 4 is rotatably supported on the outer periphery of the intermediate portion of the input shaft 1. Output side discs 3 and 3 are connected to cylindrical flange portions 4a and 4a provided at the center of the output gear 4 by spline engagement. The output gear 4 is supported in the housing 14 via a partition wall 13 formed by coupling two members, and thus can rotate around the axis O of the input shaft 1, while the axis O Directional displacement is prevented.

  The input shaft 1 is rotationally driven by a drive shaft 22 via a loading cam type pressing device 12. Specifically, a loading cam type pressing device 12 is provided between the input side disk 2 and the input shaft 1 located on the left side in the drawing, and the input side disk 2 is connected to the output side disk by the pressing device 12. The input side disk 2 can be rotationally driven while being elastically pressed toward the head 3. The pressing device 12 includes a loading cam (cam plate) 12 a that rotates together with the input shaft 1, and a plurality of (for example, four) rollers (rolling members) 12 b that are rotatably held by a cage 7. It is configured. A cam surface 113 that is uneven in the circumferential direction is formed on one side surface (the right side surface in FIG. 5) of the loading cam 12a, and the same is applied to the outer side surface (the left side surface in FIG. 5) of the input side disk 2. A cam surface 114 having a shape is formed. An angular ball bearing (angular bearing) 30 capable of supporting a thrust load is interposed between the end of the input shaft 1 and the loading cam 12a.

  The output side disks 3 and 3 are supported by needle bearings 5 and 5 interposed between the input shaft 1 so as to be rotatable about the axis O of the input shaft 1. Further, the input side disks 2 and 2 are supported on both ends of the input shaft 1 via ball splines 6 and 6 so as to rotate together with the input shaft 1. Further, as shown in FIG. 6, the power roller 11 is provided between the inner side surfaces (concave surfaces) 2 a and 2 a of the input side disks 2 and 2 and the inner side surfaces (concave surfaces) 3 a and 3 a of the output disks 3 and 3. It is pinched so that it can rotate freely.

  The input side disk 2 located on the right side in FIG. 5 has its back surface (right side in FIG. 5) abutted against the loading nut 9 via a first disc leaf spring 10 having a large elasticity, and the input shaft The displacement in the axial direction (left-right direction in FIG. 5) relative to 1 is substantially prevented. Further, a second disc spring 8 is provided between the input side disk 2 located on the left side in FIG. 5 and the loading cam 12a. These disc springs 8 and 10 are provided on the inner surfaces 2a, 2a, 3a and 3a of the disks 2, 2, 3 and 3 and the peripheral surfaces (traction surfaces) 11a and 11a of the power rollers 11 and 11 (see FIG. 6). A pressing force is applied to the contact portion.

  Therefore, in the continuously variable transmission configured as described above, when a rotational force is input from the drive shaft 22 to the loading cam 12a, the cam surface 113 causes the plurality of rollers 12b to move to the input side disk 2 as the loading cam 12a rotates. It presses against the cam surface 114 formed on the outer side surface. As a result, the input side disk 2 is pressed by the plurality of power rollers 11, and at the same time, the input side disk 2 rotates based on the pressing of the cam surfaces 113, 114 and the plurality of rollers 12b. Then, the rotation of the input side disk 2 is transmitted to the output side disk 3 through the plurality of power rollers 11 and 11 at a constant speed ratio. The rotation of the output side disks 3 and 3 is transmitted from the output gear 4 to the output shaft 17 via the transmission gear 15 and the transmission shaft 16.

  By the way, in the loading cam type pressing device 12 in such a toroidal type continuously variable transmission, when the roller 12b rolls on the cam surfaces 113 and 114, there is a difference in the moving amount accompanying the rolling in the radial direction of the loading cam 12a. Therefore, there is a problem that rolling and sliding motion occurs on the surface of the roller 12b, and the surfaces of the roller 12b and the cam surfaces 113 and 114 are easily damaged by wear or the like.

  In order to prevent such surface damage due to the rolling and sliding motion on the surface of the roller 12b, it is necessary to sufficiently lubricate the cam surfaces 113 and 114 and the surface of the roller 12b. Conventionally, as a method of lubricating the cam surfaces 113 and 114 and the roller 12b, as shown in FIG. 7, the same number of oil holes 92 as the number of cam rows are provided in the vicinity of the bottom of the loading cam 12a. 90 and a method of supplying the lubricating oil supplied to the ball bearing 30 through the oil hole 91 perpendicular thereto to the cam surfaces 113 and 114 and the roller 12b through the oil hole 92 by the centrifugal force accompanying the rotation of the input shaft 1. It is known (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 11-20251

  However, as shown in FIG. 7, in the method of providing the oil hole 92 near the bottom of the loading cam 12a and lubricating the cam surfaces 113 and 114 and the roller 12b, due to the difference in the rotational speed (centrifugal force) of the input shaft 1, A difference occurs in the lubricating oil supply position in the radial direction on the cam surfaces 113 and 114. Further, in the loading cam type pressing device 12, the amount of the roller 12b that rides on varies depending on the torque. Therefore, as shown by the broken line and the arrow in FIG. Will change. Therefore, conventionally, in order to prevent insufficient lubrication due to a change in the lubrication state, it is necessary to increase the amount of lubricating oil, and there has been a problem that efficiency is reduced due to pump loss.

  The present invention has been made in view of the above circumstances, and can provide a toroidal type capable of stably and efficiently supplying lubricating oil to the cam surface and the roller of the loading cam and preventing a reduction in efficiency due to a pump loss. An object is to provide a continuously variable transmission.

  In order to achieve the above object, a toroidal continuously variable transmission according to claim 1 includes an input shaft to which a rotational force from the engine is input, and an input coupled to the input shaft and rotating integrally with the input shaft. An output side disk that receives the rotational force of the input side disk at a predetermined speed ratio via a power roller provided between the input side disk and the input side disk; A loading cam type pressing device that presses the side disc in the axial direction, and the pressing device is provided between a loading cam that rotates together with the input shaft, and a cam surface of the loading cam and a cam surface of the input side disc. A rolling element that is movably held by a roller, and a bearing for supporting a thrust load is interposed between the end of the input shaft and the loading cam. And a first lubricating oil supply means for supplying lubricating oil for the bearing between an end portion of the input shaft and the loading cam, and an end portion of the input shaft. The end of the input shaft so that the amount of lubricant discharged from the gap with the loading cam is less than the amount of lubricant supplied by the first lubricant supply means; By adjusting the clearance between the loading cam and the loading cam, the lubricating oil accumulated between the end of the input shaft and the loading cam passes through the clearance formed between the loading cam and the input side disk. And a second lubricating oil supply means configured to flow to the surface and the rolling elements.

  In the first aspect of the present invention, the amount of lubricating oil discharged from the gap between the end of the input shaft and the loading cam is equal to the amount of lubricating oil supplied by the first lubricating oil supply means. Since the gap between the end of the input shaft and the loading cam is adjusted so as to be less than the supply amount, an oil sump is formed in the gap between the end of the input shaft and the loading cam, and an excess Lubricating oil can be supplied to the cam surface and the roller via a gap between the loading cam and the input side disk. In this case, since the lubricating oil spreads radially on the cam surface due to the centrifugal force accompanying the rotation of the input shaft, the lubricating oil is applied to the cam surface and the rollers without increasing the amount of lubricating oil as in the conventional case. It can supply stably and can prevent the fall of the efficiency by the loss of a pump.

  Further, the toroidal continuously variable transmission according to claim 2 is the toroidal continuously variable transmission according to claim 1, wherein the second lubricating oil supply means has a rotational torque input to the input shaft. Rotation that is input to the input shaft when the minimum clearance between the end of the input shaft and the loading cam is larger than the minimum clearance between the loading cam and the input side disk when the size is less than a predetermined size. When the torque exceeds a predetermined magnitude, deformation of the loading cam causes the minimum clearance between the end of the input shaft and the loading cam to be smaller than the minimum clearance between the loading cam and the input side disk. The clearance between the end of the input shaft and the loading cam is adjusted.

  In the invention described in claim 2, when the rotational torque input to the input shaft is small (when the load is small), the amount of lubricating oil to the cam surface and the roller can be limited (more than necessary). Therefore, it is possible to further reduce the loss and improve the efficiency.

  In the above configuration, the second lubricating oil supply means extends in a radial direction from the end of the input shaft toward the loading cam, and extends to narrow a gap between the end of the input shaft and the loading cam. It is preferable to have a part. In this case, the extension part may be formed by the input shaft, or may be separately attached to the input shaft.

  According to the toroidal continuously variable transmission of the present invention, the amount of lubricating oil discharged from the gap between the end of the input shaft and the loading cam is reduced by the gap between the end of the input shaft and the loading cam. Since the gap between the end of the input shaft and the loading cam is adjusted so that the amount of the lubricating oil supplied to the engine is less than the amount supplied, the lubricating oil is stable with respect to the cam surface of the loading cam and the roller. It can supply efficiently and can prevent the fall of the efficiency by the loss of a pump.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The feature of the present invention lies in the structure of the loading cam type pressing device, and other configurations and operations are the same as those of the conventional configuration and operations described above. Therefore, only the features of the present invention will be described below. The other parts are denoted by the same reference numerals as those in FIGS. 5 to 7 and detailed description thereof is omitted.

  FIG. 1 shows a first embodiment of the present invention. As shown in the figure, in the toroidal continuously variable transmission according to the present embodiment, an angular ball bearing (angular bearing) 30 inserted between an end (ridge) 1a of the input shaft 1 and a loading cam 12a is provided. On the other hand, first lubricating oil supply means for supplying lubricating oil is provided. Specifically, the first lubricating oil supply means includes an axial hole 90 as a lubricating oil supply hole extending along the axial direction at the center of the input shaft 1, and extends perpendicular to the axial hole 90. It comprises an oil hole 91 leading to a gap between the end 1a of the input shaft 1 and the loading cam 12a.

  In the toroidal continuously variable transmission according to this embodiment, the lubricating oil supplied by the first lubricating oil supply means and accumulated between the end 1a of the input shaft 1 and the loading cam 12a is input to the loading cam 12a. Second lubricating oil supply means is provided to flow to the cam surfaces 113 and 114 and the roller 12b through a gap c formed with the side disk 2. Specifically, the second lubricating oil supply means extends in the radial direction from the end 1a of the input shaft 1 toward the loading cam 12a, and between the end 1a of the input shaft 1 and the loading cam 12a. It consists of the extension part 1b which narrows a clearance gap. Then, by defining the extension length of the extension portion 1b, the discharge amount of the lubricating oil discharged from the gap between the end portion 1a of the input shaft 1 and the loading cam 12a is the first lubrication. The amount of lubricating oil supplied by the oil supply means is set to be smaller. In the present embodiment, the extending portion 1 b is formed integrally with the input shaft 1.

  As described above, in the present embodiment, the amount of lubricating oil discharged from the gap between the end 1a of the input shaft 1 and the loading cam 12a is the amount of lubricating oil supplied by the first lubricating oil supply means. Since the gap between the end 1a of the input shaft 1 and the loading cam 12a is adjusted so as to be smaller than the supply amount, an oil pool is accumulated in the gap between the end 1a of the input shaft 1 and the loading cam 12a. Q is formed, and excess lubricating oil can be supplied to the cam surfaces 113 and 114 and the roller 12b via the gap c between the loading cam 12a and the input side disk 2. In this case, since the lubricating oil spreads radially on the cam surfaces 113 and 114 due to the centrifugal force accompanying the rotation of the input shaft 1, the lubricating oil can be applied to the cam surface 113 without increasing the amount of the lubricating oil as in the prior art. , 114 and the roller 12b can be stably supplied, and a reduction in efficiency due to pump loss can be prevented.

  FIG. 2 shows a second embodiment of the present invention. As shown in the figure, in the toroidal continuously variable transmission according to the present embodiment, the extending portion of the second lubricating oil supply means is composed of an annular member 95 that is separately attached to the end 1 a of the input shaft 1. Other configurations are the same as those in the first embodiment. Even with such a configuration, the same effects as those of the first embodiment can be obtained.

  FIG. 3 shows a third embodiment of the present invention. As described above, in the loading cam type pressing device 12, the plurality of rollers 12b are pressed against the cam surface 114 on the input side disk 2 due to the uneven shape of the cam surface 113 of the loading cam 12a. The inner side surfaces 2a and 3a of the input side disk 2 and the output side disk 3 and the peripheral surface 11a of the power roller 11 are strongly pressed against each other. Therefore, the loading cam 12a receives a strong force in the axial direction from the plurality of rollers 12b, and deformation occurs in the direction opposite to the input side disk 2 as indicated by a broken line in FIG. In the present embodiment, the second lubricating oil supply means is configured using this deformation.

  That is, in the toroidal continuously variable transmission according to the present embodiment, the second lubricating oil supply means includes the end 1a of the input shaft 1 and the loading cam when the rotational torque input to the input shaft 1 is less than a predetermined magnitude. 12a is larger than the minimum gap b between the loading cam 12a and the input side disk 2 (see FIG. 3A), and the rotational torque input to the input shaft 1 is predetermined. The minimum gap a between the end 1a of the input shaft 1 and the loading cam 12a is smaller than the minimum gap b between the loading cam 12a and the input side disk 2 due to the deformation of the loading cam 12a when the size of the loading cam 12a is exceeded. (See (b) of FIG. 3) The clearance between the end 1a of the input shaft 1 and the loading cam 12a is adjusted. In the present embodiment, the extending portion 1 b is formed integrally with the input shaft 1.

  Thus, in this embodiment, when the rotational torque input to the input shaft 1 is small (when the load is small), the amount of lubricating oil to the cam surfaces 113 and 114 and the roller 12b can be limited (necessary). Since the above lubricating oil is not centrifugally supplied), it is possible to further reduce the loss and improve the efficiency.

  FIG. 4 shows a fourth embodiment of the present invention. As shown in the figure, in the toroidal continuously variable transmission according to the present embodiment, the extending portion of the second lubricating oil supply means is composed of an annular member 95 that is separately attached to the end 1 a of the input shaft 1. Other configurations are the same as those of the third embodiment. Even with such a configuration, the same effects as those of the third embodiment can be obtained.

  The present invention can be applied to a full toroidal continuously variable transmission having no trunnion in addition to a half toroidal continuously variable transmission such as a single cavity type or a double cavity type.

It is a principal part expanded sectional view which concerns on the 1st Embodiment of this invention. It is a principal part expanded sectional view concerning the 2nd Embodiment of this invention. It is a principal part expanded sectional view concerning the 3rd Embodiment of this invention, (a) is a state figure at the time of no load, (b) is a state figure at the time of load. It is a principal part expanded sectional view concerning the 4th Embodiment of this invention, (a) is a state figure at the time of no load, (b) is a state figure at the time of load. It is sectional drawing of the conventional toroidal type continuously variable transmission. It is sectional drawing which shows the power roller clamped between the input side disk and output side disk in the conventional toroidal type continuously variable transmission. (A) is a sectional side view of the vicinity of a loading cam in a conventional toroidal type continuously variable transmission, and (b) is a front view of the loading cam.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input shaft 1a End part 2 Input side disk 12 Pressing device 12a Loading cam 12b Rolling element 30 Bearing 113A, 114A Cam surface c Clearance

Claims (5)

An input shaft to which rotational force from the engine is input, an input side disk coupled to the input shaft and rotating integrally with the input shaft, and a power roller provided between the input side disk and the input side An output-side disk that receives the rotational force of the disk at a predetermined speed ratio; and a loading cam type pressing device that is disposed on the back surface of the input-side disk and presses the input-side disk in the axial direction. A loading cam that rotates together with the input shaft, and a rolling element that is rotatably held between the cam surface of the loading cam and the cam surface of the input-side disk, and an end of the input shaft; In the toroidal-type continuously variable transmission in which a bearing for supporting a thrust load is inserted between the loading cam,
First lubricating oil supply means for supplying lubricating oil for the bearing between an end of the input shaft and the loading cam;
The amount of lubricating oil discharged from the gap between the end of the input shaft and the loading cam is less than the amount of lubricating oil supplied by the first lubricating oil supply means. By adjusting the gap between the end of the input shaft and the loading cam, the lubricating oil accumulated between the end of the input shaft and the loading cam is placed between the loading cam and the input side disk. Second lubricating oil supply means configured to flow to the cam surface and the rolling element through a formed gap;
A toroidal-type continuously variable transmission.   The second lubricating oil supply means has a minimum gap between the end of the input shaft and the loading cam when the rotational torque input to the input shaft is less than a predetermined magnitude. And the minimum clearance between the end of the input shaft and the loading cam due to deformation of the loading cam when the rotational torque input to the input shaft exceeds a predetermined magnitude. The clearance between the end of the input shaft and the loading cam is adjusted so that the clearance is smaller than the minimum clearance between the loading cam and the input-side disk. Toroidal continuously variable transmission.   The second lubricating oil supply means extends in the radial direction from the end of the input shaft toward the loading cam, and extends to narrow a gap between the end of the input shaft and the loading cam. The toroidal-type continuously variable transmission according to claim 1 or 2, characterized by comprising:   The toroidal continuously variable transmission according to claim 3, wherein the extending portion is formed by the input shaft.   The toroidal continuously variable transmission according to claim 3, wherein the extension portion is separately attached to the input shaft.

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