JP4311112B2 - Pivot shaft manufacturing method and gripping device for toroidal continuously variable transmission - Google Patents

Description

  The present invention relates to a method for manufacturing a part having an eccentric part that is eccentric with respect to a shaft part, such as a pivot shaft of a toroidal-type continuously variable transmission, and an automobile part including the part having the eccentric part.

  Conventionally, when manufacturing a pivot shaft used in a toroidal-type continuously variable transmission, in order to obtain an eccentric shaft having a desired eccentric amount, cutting or grinding was performed while gripping the concentric shaft of the pivot shaft. (For example, refer to Patent Document 1).

  Referring to FIGS. 10 and 11, the collet chuck type gripping device 40 is provided in the chuck body 41 and is used to input a thrust to the collet chuck 43 and the collet chuck 43 that grips the concentric shaft 42 by the inner diameter portion 43 a. The draw bar 44 and a claw portion 45 provided on the draw bar 44 and engaged with the collet chuck 43 are provided.

  As another example of a gripping device that grips a component such as a pivot shaft, as shown in FIGS. 12 to 14, the fixed-side parent claw 51 and the movable-side parent claw 52 are in the same direction as the eccentric direction of the component (see FIG. And a gripping device 50 using a two-way claw chuck provided along the vertical direction in FIG.

  A fixed side claw 53 is attached to the fixed side parent claw 51 via a spacer 54. A movable side claw 55 is attached to the movable side claw 52 via a spacer 56, and the movable side claw 55 has a stroke amount S range along the component gripping direction which is the same direction as the eccentric direction. And a shaft gripping portion 57 is formed between the fixed side claw 53 and the shaft.

The gripping device 50 grips the concentric shaft 58a of the component 58 by the shaft gripping portion 57 by moving the movable side pawl 55 within the stroke amount S along the component gripping direction with respect to the fixed side pawl 53. To do.
Japanese Patent Laid-Open No. 9-314273 (page 2-3, FIG. 1)

  Of the conventional gripping devices 40 and 50 described above, when the collet chuck type gripping device 40 as shown in FIGS. 10 and 11 is used, the amount of adjustment of the eccentric amount E is adjusted by the claw portion 45 of the draw bar 44 and the collet chuck. 43 and clearance C. This clearance C cannot be increased in order to ensure the rigidity of the claw portion 45.

  Therefore, there is a problem that the amount of adjustment of the eccentricity E is relatively small, and it is difficult to process parts having greatly different eccentricity E. That is, in the case of a part having a significantly different eccentricity E, remanufacturing from the chuck body 41 is necessary to cope with exceeding the adjustment amount limit, which is a big problem in terms of time and cost.

  Further, since the inner diameter portion 43a of the collet chuck 43 is formed along the shaft outer diameter of the gripping shaft 42, accurate gripping accuracy can be maintained when the shaft outer diameter of the concentric shaft 42 changes. There was no problem. Generally, it is necessary to suppress the error of the outer diameter of the concentric shaft 42 to be gripped to less than 1 mm. Therefore, when machining a part whose outer diameter of the concentric shaft 42 to be gripped differs by 1 mm or more, the collet chuck 43 needs to be remanufactured, resulting in an increase in cost.

  On the other hand, in the gripping device 50 shown in FIGS. 12 to 14, the shaft gripping portion 57 formed by the fixed side claw 53 and the movable side claw 55 has a V shape with an arbitrary angle β. For this reason, when the dimensional error of the shaft outer diameter of the concentric shaft 58a to be gripped is (φD−φd), the eccentricity amount error Δe is Δe = (φD−φd) / (2 · cos β).

  For example, when φD = 25 mm, φd = 24 mm, and β = 45 °, the eccentricity error Δe is 0.707 mm, which is a factor for increasing the machining error of the eccentricity. Further, if E = 10 ± 0.05 is an allowable value of the eccentric amount, a back side calculation of a dimensional error of the shaft outer diameter allowed to satisfy the allowable value is (φD−φd) = 0.14 mm. .

  Therefore, there is a problem that the eccentric amount of the eccentric shaft 58b varies due to a dimensional error in the outer diameter of the concentric shaft 58a to be gripped. Further, it is difficult to cope with parts having different eccentric amounts of the eccentric shaft 58b and parts having different shaft outer diameters of the concentric shaft 58a to be gripped, and the gripping device 50 corresponding to each part must be remanufactured. There was also a problem that time and cost were consumed.

  The present invention can minimize the influence of a change in the outer diameter of one of the gripped shafts as much as possible, can obtain high eccentricity accuracy, and can adjust the eccentricity easily and quickly, It aims at providing the manufacturing method of the components which have an eccentric part which can respond to various shaft outer diameters and eccentric amounts.

The above object of the present invention is achieved by the following configurations.
(1) A method for manufacturing a pivot shaft of a toroidal-type continuously variable transmission having an eccentric portion that is eccentric by a predetermined amount with respect to a shaft portion,
The pair of claws of the gripping means having a pair of claws sandwiching the shaft portion and having a V-shaped groove formed on at least one of the claws are relatively moved so that the V-shaped groove of the one claw and the V-shaped groove With the contact surface of the other claw facing the groove, the shaft portion is sandwiched and gripped from a direction orthogonal to the eccentric direction of the eccentric portion, thereby moving the shaft portion along the eccentric direction. , By adjusting the position and adjusting the amount of eccentricity of the eccentric portion, the eccentric portion is arranged along a predetermined rotation axis,
A method of manufacturing a pivot shaft for a toroidal continuously variable transmission, wherein the eccentric portion is processed by rotating about the predetermined rotation axis in a state where the shaft portion is held.
(2) A gripping device for a pivot shaft of a toroidal continuously variable transmission having an eccentric portion that is eccentric by a predetermined amount with respect to a shaft portion,
A gripping means having a pair of claws sandwiching the shaft portion and having a V-shaped groove formed on at least one of the claws;
The pair of claws are moved relative to each other from the direction perpendicular to the eccentric direction of the eccentric portion between the V-shaped groove of one of the claws and the contact surface of the other claw facing the V-shaped groove. By gripping the shaft portion therebetween, thereby moving and adjusting the position of the shaft portion along the eccentric direction, and adjusting the amount of eccentricity of the eccentric portion, the eccentric portion becomes a predetermined rotation axis. Arranged along
A gripping device for a pivot shaft of a toroidal-type continuously variable transmission, wherein the shaft is rotated around the predetermined rotation shaft in a state where the shaft is gripped.

  According to the present invention, the shaft portion of the component is gripped from the direction orthogonal to the eccentric direction of the eccentric portion of the component, and the eccentric portion is processed while the shaft portion is gripped. Therefore, the influence of the shaft outer diameter dimensional change of the gripped shaft portion can be reduced as much as possible, and high eccentricity accuracy can be obtained. Moreover, since the position of the shaft portion can be adjusted along the eccentric direction, the amount of eccentricity can be adjusted easily and quickly, and various shaft outer diameters and amounts of eccentricity can be accommodated.

  Hereinafter, with reference to drawings, the manufacturing method of the part which has an eccentric part concerning the present invention is explained in detail.

  FIG. 1 is a schematic view showing a gripping device and a gripped component according to the first embodiment of the present invention, FIG. 2 is a right side view of the gripping device of FIG. 1, and FIG. 3 is a main part of FIG. It is an enlarged view. 4 is a schematic side view showing components gripped by the gripping device of FIG. 1, and FIG. 5 is a cross-sectional view showing an example of a toroidal continuously variable transmission to which the components of FIG. 4 are applied. 6 is a cross-sectional view taken along the line AA in FIG.

  Referring to FIGS. 5 and 6, in the toroidal continuously variable transmission 100, a plurality of power rollers 101 are rotatably held between the input side disk 102 and the output side disk 103, and the trunnion 104 is tilted. Accordingly, the inclination angle of the rotation center of each power roller 101 is changed, so that the gear ratio between the input side disk 102 and the output side disk 103 is variably controlled.

  The toroidal continuously variable transmission 100 includes a pivot shaft 110 that supports a power roller 101 on a trunnion 104. The pivot shaft 110 has one shaft 110a (hereinafter referred to as a concentric shaft) as a shaft portion rotatably supporting the power roller 101 via a needle bearing 111 and the other shaft 110b (hereinafter referred to as an eccentric portion). , Which is referred to as an eccentric shaft) is rotatably supported in the trunnion hole 113 via a needle bearing 114.

  The amount of eccentricity of each of the shafts 110a and 110b in the pivot shaft 110 must be highly accurate (for example, the amount of eccentricity E ± 0.05) because it affects the speed synchronization stability and responsiveness of the toroidal-type continuously variable transmission 100. ). For this reason, the pivot shaft 110 is subjected to cutting, grinding, or both in order to obtain a desired amount of eccentricity and accuracy of other parts.

  As a material of a part that becomes the pivot shaft 110, a material formed into a dimension that gives a necessary machining allowance to a finished dimension of the concentric shaft 110a and the eccentric shaft 110b by plastic working or a round bar material is used. .

  When a round bar material is used, the eccentric shaft 110b is machined in a state where the concentric shaft 110a side is first cut out and the concentric shaft 110a is gripped by the gripping device 10 described later. Here, assuming that the eccentric amount E of the eccentric shaft 110b and the finished outer diameter size φd of the eccentric shaft 110b (see FIG. 4), the outer diameter size φD0 of the round bar material has an appropriate allowance for (E + φd / 2). The assigned value.

  On the other hand, when using a material formed by plastic working, the concentric shaft 110a is processed after the eccentric shaft 110b is gripped by the gripping device 10 to be described later, and then the concentric shaft 110a is gripped. In this state, the eccentric shaft 110b is processed. In addition, the processing order of the concentric shaft 110a and the eccentric shaft 110b is changed according to the part shape and the like.

  Next, the gripping device 10 that grips the part 110 when the part 110 that is the pivot shaft shown in FIG. 4 is processed will be described with reference to FIGS.

  The gripping device 10 includes gripping means 12 that grips the concentric part 110a of the component 110 such that the center of the eccentric part 110b is aligned with the central axis of the rotatable chuck body 11. The gripping means 12 is provided on both sides of the concentric shaft 110a so as to grip the concentric shaft 110a of the component 110 from the component gripping direction (left and right direction in FIG. 2) orthogonal to the eccentric direction of the eccentric shaft 110b of the component 110. The fixed side child claw 13 and the movable side child claw 14, the fixed side base claw 13 to which the fixed side child claw 13 is attached via the spacer 15, and the movable side to which the movable side child claw 14 is attached via the spacer 17. And a side base 18.

  The position of the fixed side claw 13 is adjusted along the component gripping direction (left and right direction in FIG. 2) perpendicular to the eccentric direction by the length of the long hole 13a by the long hole 13a and the bolt 19 inserted into the long hole 13a. Is possible. Further, the position of the fixed base 16 can be adjusted along the eccentric direction (vertical direction in FIG. 2) by the length of the long hole 16a by the long hole 16a and the bolt 20 fitted in the long hole 16a. It is fixed to the chuck body 11. Thereby, the position of the fixed side claw 13 attached to the fixed side base 16 can also be adjusted in the eccentric direction.

  The position of the movable side pawl 14 can be adjusted along the eccentric direction (vertical direction in FIG. 2) by the length of the long hole 14a by means of the long hole 14a and the bolt 21 inserted in the long hole 14a. Further, the movable side base 18 can move the movable side claw 14 in the component gripping direction (left and right direction in FIG. 2) within the range of the stroke amount S, and the gripping force on the movable side claw 14 Is generated.

  Accordingly, the gripping means 12 moves the movable side claw 14 toward the fixed side claw 13 by moving the movable side base 18 in the component gripping direction, and from a direction orthogonal to the eccentric direction of the eccentric shaft 110b. The concentric shaft 110a is gripped. The gripping means 12 can adjust the position of the concentric shaft 110a along the eccentric direction (vertical direction in FIG. 2) by the long hole 16a of the fixed side base 16 and the long hole 14a of the movable side claw 14. 110 can be adjusted to have a desired eccentricity E.

  As shown in FIG. 3, the fixed side claw 13 and the movable side claw 14 include a V-shaped groove 13 b formed in the fixed side claw 13 and a V-shaped groove 14 b formed in the movable side claw 14. Are arranged to face each other. Each V-shaped groove 13b, 14b has an arbitrary angle β with respect to the component gripping direction. The gripping means 12 has a total of four points: two points on the V-shaped groove 13b of the fixed side claw 13 and two points on the V-shaped groove 14b of the movable side claw 14, and the outer diameter of the concentric shaft 110a of the component 110. Grip in contact with the part.

In the gripping device 10 of the present embodiment, the eccentricity error Δe when the gripping concentric shaft 110a has the shaft outer diameter error Δd (= φD−φd) is expressed by the following equation.
Δe = e−E
= {E ² + (Δd / (2 · cos β)) ² } ^1/2 −E
In the above formula, φD is the desired shaft outer diameter of the concentric shaft 110a, φd is the actual shaft outer diameter of the concentric shaft 110a, β is the tip angle of the fixed side claw 13 and the movable side claw 14, and e is The distance E from the eccentric shaft 110b when gripping the concentric shaft 110a with the shaft outer diameter φd is the distance from the eccentric shaft 110b when gripping the concentric shaft 110a with the shaft outer diameter φD, that is, a desired amount of eccentricity. is there.

  Here, if φD = 25 mm, φd = 24 mm, β = 45 °, and E = 10 mm, the eccentricity error Δe is Δe = 0.025 mm from the above equation.

  On the other hand, in the conventional gripping device 50 shown in FIGS. 12 to 14, when φD = 25 mm, φd = 24 mm, and β = 45 °, the eccentricity error Δe = 0.707 mm.

  When the numerical value of the eccentricity error Δe obtained as described above is compared between the gripping device 10 of the present embodiment and the conventional gripping device 50 shown in FIGS. 12 to 14, in this embodiment, the component gripping direction is the component It is understood that the eccentricity error Δe is greatly improved by the direction orthogonal to the eccentric direction of the 110 eccentric shaft 110b.

  Further, when E = 10 ± 0.05 is set as the allowable value of the eccentricity, the shaft outer diameter error Δd of the concentric shaft 110a can be allowed to be φ2.005 mm. Therefore, according to the present embodiment, even if there is a shaft outer diameter error Δd larger than the shaft outer diameter allowable error φ0.14 mm of the concentric shaft 58a of the conventional gripping device 50 shown in FIGS. Is retained.

  Furthermore, even when there is a change that exceeds the allowable value of the shaft outer diameter error Δd of the concentric shaft 110a, the thickness of the elongated hole 13a provided in the fixed side pawl 13 and the spacer 15 can be adjusted by adjusting the thickness. It can be adjusted to fit the outer diameter of the shaft. Even when it is desired to significantly change the eccentricity E, by adjusting the long holes 16a and 14a provided in the fixed side base 16 and the movable side claw 14, respectively, in the eccentric direction corresponding to the length of each long hole. It can be adjusted.

  Thereby, the component 110 which is a pivot shaft is gripped by the gripping device 10 from the direction orthogonal to the eccentric direction of the eccentric shaft 110b, and in this state, the eccentric shaft is cut, ground, or Both processes are applied. Thereby, parts manufacture with high eccentricity accuracy can be performed.

  Therefore, according to the first embodiment, the gripping device 10 grips the concentric shaft 110a of the component 110 from the direction orthogonal to the eccentric direction of the eccentric shaft 110b of the component 110, thereby removing the off-axis of the concentric shaft 110a. Even when there is a large variation in diameter, the influence of a change in the outer diameter of the concentric shaft 110a can be minimized, and high eccentricity accuracy can be obtained.

  In addition, the gripping device 10 can easily and quickly respond to the eccentric amount E of the eccentric shaft 110b of the component 110 within the adjustment range by adjusting the positions of the fixed base 16 and the movable side pawl 14 along the eccentric direction. The outer diameter portion of the eccentric shaft 110b of the component 110 can be processed with high accuracy. That is, it is possible to easily and quickly cope with changes in the outer diameter of the shaft and the amount of eccentricity E, and it is possible to process parts with high eccentricity accuracy.

  Furthermore, in the conventional collet chuck type gripping device shown in FIGS. 10 and 11, the grip stroke amount is 1 mm or less, whereas according to the grip device 10 of each of the above embodiments, the grip stroke of at least about 5 mm. The amount S can be secured. Therefore, it can respond to a wide range of processing objects.

  Even when it is desired to grip parts with different shaft outer diameters exceeding the grip stroke amount S = 5 mm, the thickness of the spacers 15 and 17 and the height of the fixed side pawl 13 can be changed easily and at low cost. Can respond.

  In many cases, the part 110 having an eccentric portion such as a pivot shaft is required to have strength. In such a case, after roughing by turning, strengthening processing such as heat treatment is performed. Such a heat-treated product can be finished to a desired dimension by performing a hard turning process or a grinding process while being gripped by the gripping device 10 described above. Therefore, this embodiment can be applied to any of turning before heat treatment, turning after heat treatment, or grinding.

  FIG. 7 is a schematic view showing a gripping device and a gripped component according to the second embodiment of the present invention.

  Referring to FIG. 7, in the gripping device 20 of the second embodiment, no fixed claw is provided, and the gripping means 21 is configured so that the concentric shaft 110a is in the component gripping direction (in FIG. A pair of movable claws 22 are provided so as to be sandwiched from the left and right directions. The pair of movable claws 22 can move in the component gripping direction within the range of the stroke amount S, and can be adjusted along the eccentric direction by the elongated holes 22a and the bolts 23 inserted into the elongated holes 22a. Is provided.

  According to the above configuration, since the concentric shaft 110a is gripped by the pair of movable claws 22, the component gripping stroke amount S is about 2 as compared with the gripping device 10 of the first embodiment in which one side is a fixed claw. Can be doubled.

  Other configurations and operations are the same as those in the first embodiment.

  FIG. 8 is a schematic view showing a gripping device and a gripped component according to the third embodiment of the present invention.

  Referring to FIG. 8, in the gripping device 30 of the third embodiment, the gripping means 31 is provided so as to sandwich the concentric shaft 110a from the component gripping direction (left-right direction in FIG. 8) orthogonal to the eccentric direction of the eccentric part 110b. A pair of movable claws 32 and 33 are provided. The pair of movable claws 32 and 33 can move in the component gripping direction within the range of the stroke amount S, and in the eccentric direction by the bolts 34 and 35 inserted into the elongated holes 32a and 33a and the elongated holes 32a and 33a. It is provided so that position adjustment is possible along.

  The movable claw 32 includes a V-shaped groove 32b that comes into contact with the concentric shaft 110a, while the surface of the movable claw 33 that comes into contact with the concentric shaft 110a is not formed in a V-shaped groove shape, but is constituted by a flat surface 33b. . Accordingly, the gripping means 31 has three points in total, that is, two points on the V-shaped groove 32b of the movable claw 32 on the right side in FIG. 8 and one point on the flat surface 33b of the movable claw 33 on the left side in FIG. The outer diameter part of the concentric shaft 110a is contacted and gripped.

  According to the above configuration, the movable claw 33 side on the left side in FIG. 8 of the gripping means 31 is not formed in a V-shaped groove shape and is configured by the flat surface 33b, so the right side in FIG. The amount of eccentricity can be adjusted simply by adjusting the position of the movable claw 32, and the amount of eccentricity can be adjusted easily and quickly.

  Other configurations and operations are the same as those in the second embodiment.

  Note that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made. In the present embodiment, the processing of the pivot shaft having the shafts on both sides has been described. However, as shown in FIG. 9, the eccentric shaft 120b that is an eccentric portion that is eccentric by a predetermined amount with respect to the concentric shaft 120a that is the shaft portion is provided. The present invention can also be applied to the processing of various parts 120.

It is the schematic which shows the holding | gripping apparatus which is 1st Embodiment of this invention, and the hold | gripped components. It is a right view of the holding | gripping apparatus of FIG. It is a principal part enlarged view of the holding | gripping apparatus of FIG. It is a schematic side view which shows the components which have the eccentric shaft hold | gripped by the holding | gripping apparatus of FIG. It is sectional drawing which shows the example of the toroidal type continuously variable transmission to which the components which have the eccentric shaft of FIG. 4 are applied. It is AA sectional drawing of FIG. It is the schematic which shows the holding | gripping apparatus which is 2nd Embodiment of this invention, and the hold | gripped components. It is the schematic which shows the holding | gripping apparatus which is 3rd Embodiment of this invention, and the hold | gripped components. It is a schematic side view which shows the components which have the eccentric hole hold | gripped by the holding | grip apparatus. It is sectional drawing which shows the conventional collet chuck type holding | gripping apparatus. It is a right view of FIG. It is a schematic side view which shows the other example of the conventional holding | grip apparatus in a partial cross section. It is a right view of the holding | gripping apparatus of FIG. It is a principal part enlarged view of FIG.

Explanation of symbols

10, 20, 30 Gripping device 11 Chuck body
12, 21, 31 Grasping means 13 Fixed side claw 13a Long hole 13b V groove 14 Movable side child claw 14a Long hole 14b V groove 15 Spacer 16 Fixed side base 16a Long hole 17 Spacer 18 Movable side base 19 Bolt 20 Bolt 21 Bolt 110, 120 Pivot shaft (parts)
110a, 120a Concentric shaft (shaft)
110b Eccentric shaft (Eccentric part)
120b Eccentric hole (Eccentric part)

Claims (2)

A method for manufacturing a pivot shaft of a toroidal continuously variable transmission having an eccentric portion that is eccentric by a predetermined amount with respect to a shaft portion,
The pair of claws of the gripping means having a pair of claws sandwiching the shaft portion and having a V-shaped groove formed on at least one of the claws are relatively moved so that the V-shaped groove of the one claw and the V-shaped groove With the contact surface of the other claw facing the groove, the shaft portion is sandwiched and gripped from a direction orthogonal to the eccentric direction of the eccentric portion, thereby moving the shaft portion along the eccentric direction. , By adjusting the position and adjusting the amount of eccentricity of the eccentric portion, the eccentric portion is arranged along a predetermined rotation axis,
A method of manufacturing a pivot shaft for a toroidal continuously variable transmission, wherein the eccentric portion is processed by rotating about the predetermined rotation axis in a state where the shaft portion is held. A gripping device for a pivot shaft of a toroidal-type continuously variable transmission having an eccentric portion eccentric by a predetermined amount with respect to a shaft portion,
A gripping means having a pair of claws sandwiching the shaft portion and having a V-shaped groove formed on at least one of the claws;
The pair of claws are moved relative to each other from the direction perpendicular to the eccentric direction of the eccentric portion between the V-shaped groove of one of the claws and the contact surface of the other claw facing the V-shaped groove. By gripping the shaft portion therebetween, thereby moving and adjusting the position of the shaft portion along the eccentric direction, and adjusting the amount of eccentricity of the eccentric portion, the eccentric portion becomes a predetermined rotation axis. Arranged along
A gripping device for a pivot shaft of a toroidal-type continuously variable transmission, wherein the shaft is rotated around the predetermined rotation shaft in a state where the shaft is gripped .

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