JP2002172560A - Machining method and device of trunnion for toroidal continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machining method of a trunnion for a toroidal transmission capable of improving the efficiency by shortening a machining time, and executing the machining with high accuracy in size. SOLUTION: In this machining method of the trunnion for the toroidal continuously variable transmission having a pair of concentric shaft parts 7a, 7b on both end parts for oscillatably, displaceably and rotatably supporting a power roller forming the toroidal continuously variable transmission, and having a circular hold 16 for assembling a radial needle bearing, on a flat face 15 of an intermediate part, the circular hole 16 of the trunnion 8 is taken as tool reference and fixed by a 180 deg. dividing chuck mechanism 45, one shaft part 7a is ground by a grinding wheel 43, and then the other shaft part 7b is ground by the grinding wheel 43 after the 180 deg. dividing of the trunnion 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for processing a trunnion for a toroidal type continuously variable transmission used as a transmission for an automobile, for example.

[0002]

2. Description of the Related Art A variator of a toroidal type continuously variable transmission is configured as shown in FIG. In other words, an input disk 2 and an output disk 3 are rotatably supported on the input shaft 1 connected to a drive source (not shown) such as an engine via a needle bearing. Input disk 2
A cam plate 4 is spline-engaged with the input shaft 1 on the rear surface side of the shaft. A roller 5 is interposed between the cam plate 4 and the input disk 2 to press the input disk 2 against the output disk 3. A loading cam type pressing mechanism 6 is provided.

[0003] A trunnion 8 is provided between the input disk 2 and the output disk 3 so as to swing about a shaft described later, and a displacement shaft 9 is provided at the center of the trunnion 8. A power roller 10 is rotatably supported on the displacement shaft 9, and the power roller 10 has a traction portion in contact with the input disk 2 and the output disk 3, and is inclined between the input disk 2 and the output disk 3. rolling freely are rolling contact.

[0004] A power roller bearing 11 is provided between the trunnion 8 and the power roller 10. The power roller bearing 11 allows rotation of the power roller 10 while supporting a load applied to the power roller 10 in the thrust direction. Such a power roller bearing 1
A plurality of balls 12 of 1 is held by the annular retainer 14 provided between the power roller 10 as a rotating part and an annular outer ring 13 provided on the trunnion 8 side.

As shown in FIG. 4, the trunnion 8 has a pair of shafts 7a, 7b concentric with each other at both ends in order to support the power roller 10 in a swinging displacement and rotatable manner.
And a circular hole 16 for incorporating a radial needle bearing is provided in the flat surface 15 of the intermediate bag portion.

Incidentally, a pair of shaft portions 7a, 7b of the trunnion for a toroidal type continuously variable transmission configured as described above.
Conventionally, a processing apparatus for processing is configured as shown in FIGS. 5 and 6. That is, a chuck mechanism 19 for gripping the trunnion 8 is provided at the tip of the main shaft 17 having the rotation center axis S.

The chuck mechanism 19 has a first receiving table 21 having a plunger 20 which advances and retreats in a direction perpendicular to the rotation center axis S of the main shaft 17, and moves in a direction parallel to the rotation center axis S of the main shaft 17. And a second receiving stand 23 having a plunger 22 which is provided. The plunger 20 of the first receiving stand 21 is provided with a piece 24 that is densely inserted into the inner peripheral surface of the circular hole 16 of the trunnion 8.

A receiving plate 25 and a work holding plate 26 are fixed to the plunger 20 with a nut 27 with a piece 24 interposed therebetween. Then, the flat surface 15 of the trunnion 8 is joined to the receiving plate 25, the work holding plate 26 is joined to the back surface of the trunnion 8, and the circular hole 16 and the flat surface 15 are ground when the shaft portion 7 of the trunnion 8 is ground. And

Further, the plunger 22 of the second receiving stand 23
Is connected to a turning lever 29 via a tension spring 28. The rotation lever 29 has a pivot pin 30 orthogonal to the rotation center axis S of the main shaft 17. Both ends of the pivot pin 30 are rotatably supported by bearings 31. The rotating lever 29 is provided with a V-shaped receiving portion 32. The rotating lever 29 rotates to grip one shaft portion 7 b of the trunnion 8 and grind the other shaft portion 7 a with a grinding wheel 33. It has become. Reference numeral 34 denotes a stopper that regulates the amount of rotation of the rotation lever 29, and the amount of protrusion can be adjusted by screwing.

[0010]

However, the trunnion processing apparatus constructed as described above uses the circular hole 16 and the flat surface 15 of the trunnion 8 as a processing reference to apply one shaft portion 7b that is not ground to the V-shape. The phase is determined by the letter-shaped receiving portion 32, and the other shaft portion 7a is ground.
Therefore, when grinding the other shaft portion 7b after grinding the one shaft portion 7a, the trunnion 8 is re-chucked and the setting is changed, and the trunnion 8 is turned 180 ° and chucked in the same manner. The phase is determined by the ground shaft 7a, and the shaft 7b on the opposite side is ground.

Therefore, grinding one trunnion 8 is performed in two steps with the re-chuck operation interposed therebetween, and since the jigs in each step are different, time is required for changing the set, and both shaft portions 7a, A considerable lead time occurs before 7b is ground.

The present invention has been made in view of the above-mentioned circumstances. An object of the present invention is to grind one shaft portion, then invert the trunnion by a 180 ° indexing chuck, and continuously rotate the other trunnion. Part can be ground,
An object of the present invention is to provide a method and an apparatus for processing a trunnion for a toroidal-type continuously variable transmission, which can improve efficiency by shortening the processing time.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, a first aspect of the present invention is to support a power roller constituting a toroidal type continuously variable transmission so as to be capable of swinging displacement and rotating freely. It has a pair of shafts concentric with each other at both ends,
In a method of processing a trunnion for a toroidal-type continuously variable transmission having a circular hole into which a radial needle bearing is incorporated on a flat surface in an intermediate portion, the trunnion circular hole is used as a processing reference.
80 fixed by ° indexing chuck, after grinding the one shaft portion by the grinding wheel, the trunnion 180
° by performing indexing characterized by grinding the other shaft portion by said grinding wheel.

According to a second aspect of the present invention, the phase of the shaft portion is determined before fixing the circular hole of the trunnion in the first aspect of the present invention by using a 180 ° indexing chuck.

A third aspect of the present invention is characterized in that a shaft portion having a long distance from a circular hole as a machining reference of the trunnion is first ground.

[0016] Claim 4 is characterized in that a flat surface is simultaneously processing reference surface of the intermediate portion of the trunnion of claim 1.

In order to support the power roller constituting the toroidal-type continuously variable transmission in a swingable and rotatable manner, the invention has a pair of shaft portions concentric with each other at both ends and a flat middle portion. In a trunnion processing device for a toroidal type continuously variable transmission having a circular hole incorporating a radial needle bearing on a surface, a grinding wheel for grinding a shaft portion of the trunnion,
It has a chuck portion that is in close contact with the circular hole of the trunnion and grips the trunnion, rotatably supports the chuck portion, performs 180 ° indexing of the trunnion, and causes both shaft portions to face the grinding wheel one by one. It is characterized by comprising a 180 ° indexing chuck mechanism and a phase determining jig for determining a phase by fitting to a shaft portion of a trunnion gripped by the 180 ° indexing chuck mechanism.

According to the above construction, the trunnion is chucked by indexing the trunnion by 180 ° with reference to the circular hole, and after grinding one shaft, the trunnion is inverted by indexing by 180 ° and the other shaft is continuously ground. be able to.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment. FIG. 1 is a front view showing a trunnion processing apparatus for a toroidal type continuously variable transmission, and FIG. 2 is a plan view thereof.

[0021] The main shaft 42 having a rotational center axis S in the processing apparatus main body 41, the shaft portion 7 of the trunnion 8 as a workpiece
A grinding wheel 43 that grinds a and 7b and a phase positioning mechanism 44 that is fitted to the shaft portions 7a and 7b of the trunnion 8 to perform phase positioning are provided.

A 180 ° indexing chuck mechanism 45 for holding the trunnion 8 is provided at a front portion of the main shaft 42. Describing the chuck mechanism 45, the base 46 is provided with a rotary actuator 47 and a work holding cylinder 48. The rotary actuator 47 has a rotating shaft 50 rotatably supported by a bearing 49, and a rotary and pinion mechanism 51.
It can be turned 80 °.

The turning shaft 50 has a large-diameter portion 50a protruding above the base 46 at the upper end, and an inner-diameter collet arbor 53 penetrating through the receiving plate 52 at the upper end of the large-diameter portion 50a.
Are provided integrally. This collet arbor 5
An inner diameter collet 54 is fitted to 3, and constitutes a chuck portion for gripping the trunnion 8 based on the circular hole 16.

A through hole 55 having a bottom portion 55a is provided in an axial center portion of the turning shaft 50 so as to penetrate upward. Further, a collet holding cylinder 56 communicating with the through hole 55 is provided in the large diameter portion 50 a of the turning shaft 50, and a piston 57 is provided inside the collet holding cylinder 56.

The piston 57 is provided with a piston rod 58 projecting in the vertical direction.
6 is divided into upper and lower chambers, and an upper chamber of the cylinder 56 is provided with a first oil passage 5 penetrating through the axial center of the histone rod 58.
The lower chamber communicates with a second oil passage 60 between the through hole 55 and the piston rod 58. The first oil passage 59 is connected to an oil supply source (not shown) via a first port 61, and the second oil passage 60 is connected to a second port 62.
To an oil supply source (not shown).

Therefore, the piston rod 58 moves up and down via the piston 57 by switching the oil supplied to the collet gripping cylinder 56, and the inner diameter collet 54 is attached to the upper end of the piston rod 58 by a nut. It is fixed by 63. Then, the inner diameter collet 54 into close contact with the inner peripheral surface of the circular hole 16 of the trunnion 8,
The receiving plate 52 is in close contact with the flat surface 15 of the trunnion 8, and holds the trunnion 8 with reference to the circular hole 16 and the flat surface 15.

On the other hand, a piston 64 is provided in the work holding cylinder 48 so as to be vertically movable.
This partitions the cylinder 48 into upper and lower chambers. The upper and lower chambers of the cylinder 48 are connected to a third oil supply source.
Port 65 and the fourth port 66 communicate with each other. Further, the piston 64 is provided with a piston rod 67 projecting above the base 46, and the piston rod 67 is provided with a connecting member 68.

A support shaft 69 protrudes from the base 46 in parallel with the piston rod 67, and a rotating member 70 is provided at the upper end of the support shaft 69 so as to be rotatable about a pivot 71. ing. The base end portion of the rotation member 70 is connected by a connecting shaft 72 and the connecting member 68, so as to rotate in the arrow direction by the vertical movement of the piston rod 67. A work holding member 7 is provided on the lower surface of the tip of the rotating member 70.
3 are provided to press the trunnion 8 from above.

Further, the phase determination mechanism 44, the phase determining jig 75 to advance and return by a cylinder built in tailstock 74 (not shown) is provided. The phase determining jig 75 is a cylindrical body provided coaxially with the rotation center axis S of the main shaft 42, and the shaft portion 7a (7
b), the shaft portion 7a (7b) coincides with the rotation center axis S of the main shaft 42, and the phase is determined.

Next, a processing method for processing the shaft portions 7a and 7b of the trunnion 8 by a processing device will be described.

As shown in FIGS. 1 and 2, a trunnion 8 is mounted on a turning shaft 50 of a 180 ° indexing chuck mechanism 45 via a receiving plate 52, and a circular hole 16 of the trunnion 8 is formed.
The inner peripheral surface of the tight inner diameter collet 54, moreover piston 57 is pushed down by the oil supplied to the upper chamber of the collet gripping cylinder 56.

Accordingly, since the inner diameter collet 54 is pulled down through the piston rod 58, the flat surface 15 of the trunnion 8 is in close contact with the receiving plate 52, and the trunnion 8 is
6 and the flat surface 15 are processing standards. Also trunnion 8
Is held down by the work holding member 73, so that the fall of the rotating trunnion 8 can be prevented.

After holding the trunnion 8 in this manner, the phase determining jig 75 of the phase determining mechanism 44
4, the jig 75 is engaged with the chamfered portion of the one shaft portion 7a of the trunnion 8 or the sheet surface of the center hole or the tapped hole. At this time, since the inner diameter collet 54 gripping the trunnion 8 has a low gripping force, the trunnion 8 rotates around the circular hole 16 when the phase determining jig 75 is fitted to the shaft portion 7a. Therefore, the center of the shaft portion 7a coincides with the rotation center axis S.

After determining the phase of the shaft portion 7a of the trunnion 8, oil is further supplied to the upper chamber of the collet gripping cylinder 56 to push down the piston 57, and the piston rod 5
By pulling down the inner collet 54 through 8
The trunnion 8 is firmly gripped. Also, the phase determining mechanism 4
The phase determining jig 75 of FIG. 4 is retracted, and the phase determining jig 75 is retracted from the shaft portion 7 a of the trunnion 8.

Next, when the grinding wheel 43 approaches the shaft portion 7a of the trunnion 8 and rotates the main shaft 42 about the rotation center axis S, the trunnion 8 is rotated by the shaft portions 7a and 7b.
, And the shaft root and the end face of the shaft portion 7a are ground by the grinding wheel 43.

After grinding one shaft portion 7a of the trunnion 8 and then grinding the other shaft portion 7b, when the rotary shaft 47 rotates the rotary shaft 50 by 180 °, the trunnion 8 rotates by 180 °. The unprocessed shaft portion 7b faces the phase determining mechanism 44.

Then, the grinding wheel 43 approaches the shaft portion 7b of the trunnion 8, and the main shaft 42 is rotated about the rotation center axis S, whereby the shaft root and the end surface of the shaft portion 7b are ground by the grinding wheel 43. Is performed.

As described above, by first grinding the shaft portion 7a at a distance from the circular hole 16 of the trunnion 8, the 1
Since the run-out amount of the shaft portion 7b that is ground after the indexing by 80 ° can be reduced, the apparent allowance can be reduced. Furthermore, the flat surface 15 of the trunnion 8 is functionally required by using the flat surface 15 as a processing reference.
Variations in the distance from the work to the two shaft portions 7a and 7b due to the work can be suppressed, and the synchronization stability of the variator can be improved.

After grinding one shaft portion 7a without rechucking the trunnion 8 as described above, the trunnion 8 is inverted by 180 ° indexing, and the other shaft portion 7a is continuously rotated.
b can be ground, and both shaft portions 7a,
Since the shaft 7b can be ground, the accuracy of the coaxiality of both shaft portions 7a and 7b is high, and the efficiency can be improved by shortening the processing time.

[0040]

As described above, according to the present invention, the trunnion is fixed at 180 ° with the chuck using the circular hole of the trunnion as a processing reference, and one shaft portion is ground with a grinding wheel. , And the other shaft is ground with a grinding wheel, so that both shafts can be ground continuously, and the processing time can be shortened to improve efficiency and to achieve high dimensional accuracy. This has the effect.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a trunnion processing apparatus for a toroidal-type continuously variable transmission according to a first embodiment of the present invention.

FIG. 2 shows the same embodiment, and is a plan view of the processing apparatus.

FIG. 3 is a vertical sectional side view showing a variator section of a general toroidal type continuously variable transmission.

FIG. 4 is a front view showing the trunnion.

FIG. 5 is a front view showing a conventional trunnion processing apparatus for a toroidal-type continuously variable transmission.

FIG. 6A is a plan view of the processing apparatus, and FIG. 6B is AA.
Sectional view along the line.

[Explanation of symbols]

 7a, 7b: Shaft 8: Trunnion 15: Flat surface 16: Circular hole 43: Grinding grindstone 44: Phase determining mechanism 45: 180 ° indexing chuck mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C034 AA01 AA13 BB75 3C043 AA01 AA12 CC02 DD05 3J051 AA03 BA03 BB02 BD02 BE09 CB06 EC03 ED20 FA02

Claims (5)

[Claims] A power roller constituting a toroidal type continuously variable transmission is provided with a pair of shafts concentric with each other at both ends to rotatably displace and rotate freely, and a radial surface is formed on a flat surface at an intermediate portion. In a method of processing a trunnion for a toroidal type continuously variable transmission having a circular hole into which a needle bearing is incorporated, the circular hole of the trunnion is fixed by a 180 ° indexing chuck with respect to a processing reference, and one shaft portion is ground by a grinding wheel A trunnion for a toroidal-type continuously variable transmission, wherein the trunnion is indexed by 180 ° and the other shaft portion is ground by the grinding wheel. 2. The trunnion for a toroidal-type continuously variable transmission according to claim 1, wherein the phase of the shaft portion is determined before the trunnion is fixed by a 180 ° indexing chuck with the circular hole of the trunnion as a processing reference. processing method. 3. The method for processing a trunnion for a toroidal-type continuously variable transmission according to claim 1, wherein a shaft portion having a long distance from a circular hole as a processing reference of the trunnion is first ground. 4. The method for processing a trunnion for a toroidal-type continuously variable transmission according to claim 1, wherein a flat surface at an intermediate portion of the trunnion is also used as a processing reference surface. 5. A pair of shafts concentric with each other at both ends to radially support a power roller constituting a toroidal-type continuously variable transmission so as to be capable of swinging displacement and rotation. In a processing apparatus for a trunnion for a toroidal type continuously variable transmission having a circular hole into which a needle bearing is incorporated, a grinding wheel for grinding a shaft portion of the trunnion, and a chuck portion for holding the trunnion in close contact with the circular hole of the trunnion. a, the chuck portion is pivotally supported and a 180 ° indexing chuck mechanism for facing both the shaft portion by performing 180 ° indexing of the trunnion on the grinding wheel by one, it is gripped by the 180 ° indexing chuck mechanism A jig for determining a phase by fitting to a shaft portion of the trunnion. On the processing equipment.