JP2001116091A - Quality control device of variable pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quality control device of a variable pulley capable of judging whether or not a highly accurately incorporated ball is proper. SOLUTION: This quality control device of a variable pulley is provided with a sheave pressing-down mechanism 35 for pressing down/restraining a fixed sheave 1 of the variable pulley 8, the sheave moving mechanism 35 is arranged for displacing a movable sheave 3 from this pressed-down fixed sheave 1 by copying after a shaft part 2, and a load cell 42 for detecting a load caused by this displacement and an operation circuit part 61 for determining sliding resistance of a ball spline from the detected load by operation processing are arranged to judge whether or not a selected ball 6 is proper from a sliding resistance value of the measured ball spline.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable pulley quality control device for controlling the quality of a variable pulley used in a belt type continuously variable transmission.

[0002]

2. Description of the Related Art A transmission for an automobile (vehicle) includes a pair of groove-width-variable pulleys having a pulley diameter (a driving side and a driven side).
There is a belt-type CVT (continuously variable transmission) in which an annular belt is stretched between the belts so that the gear ratio can be changed steplessly by a change in a pulley diameter.

The variable pulley used for this CVT is
In each case, a structure is used in which a fixed sheave having a shaft portion is formed, and a movable sheave is slidably combined with a shaft portion of the fixed sheave via a spline. Thereby, when the movable sheave is displaced along the shaft portion, the groove width is changed,
The radius of contact with the belt is changed to obtain the required gear ratio.

[0004] The splines of such a variable pulley include:
Generally, a ball spline is used. Specifically, as shown in FIGS. 3 and 4, the outer peripheral surface of the shaft portion 2 formed on the fixed sheave 1 and the inner peripheral surface of the hub 4 formed on the movable sheave 3 opposed thereto. Multiple locations,
For example, ball grooves 5a and 5b facing each other are formed at three equal positions in the circumferential direction, and a plurality of, for example, three balls 6 (steel balls) are inserted into each of the three rows of ball grooves 5a and 5b. Has been adopted.

[0005] By the way, the ball groove 5 of the ball spline
a and 5b include errors associated with the manufacture of the fixed sheave 1 and the movable sheave 3, and errors associated with the processing of the ball grooves 5a and 5b.

In order to absorb such an error, the ball 6
Conventionally, balls 6 of different dimensions have been
(For example, a plurality of balls having different diameters every 2 microns) are prepared, and the diameter of the hole formed by the ball grooves 5a and 5b is measured. A ball 6 having a diameter (close to tight) is selected, and the ball 6 is pressed into the ball grooves 5a and 5b.

In order to control the quality of the variable pulley 8, it is necessary to check whether or not the correct ball 6 has been incorporated after the ball 6 has been press-fitted. It has been proposed to measure the play (backlash) between the grooves 5a and 5b to check whether an appropriate ball diameter has been selected.

[0008]

When the ball 6 is assembled, a ball 6 that is tighter than necessary, that is, a ball 6 that is larger than necessary for the measured value is selected for some reason. It may be press-fitted between the grooves 5a and 5b.

However, according to the above-described quality control technique, when a loose ball 6 is selected for the measured value,
Although it can be determined that a loose ball diameter is incorporated from “play”, when a ball 6 that is too tight is selected,
Since it is determined that there is no backlash as when the appropriate ball 6 is selected, if the ball is too tight, the quality cannot be determined.

When the ball 6 that is too tight is incorporated, not only the mechanical loss when varying the groove width of the variable pulley 8 is increased, but also the load on the ball 6 is increased and the ball life is affected. Will be given.

Therefore, it has been proposed to control the quality of the variable pulley 8 from the load (press-fit load) when the ball 6 is press-fitted.

This is because a positioning ball is inserted into one of the three ball grooves, a plurality of balls are put into the remaining two ball grooves, and then the positioning ball is removed. Put multiple balls in the groove,
This technique measures the press-fit load of the last ball.

However, since the load of the last ball to be assembled is not always the highest, it is impossible to make a correct judgment as in the technique of measuring the backlash.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a variable pulley quality control device capable of judging whether or not an incorporated ball is appropriate with high accuracy. To provide.

[0015]

According to a first aspect of the present invention, there is provided a quality control device comprising a restraining means for restraining one of a fixed sheave and a movable sheave of a variable pulley, wherein one of the fixed sheave and the movable sheave is restrained. A moving means for displacing the other in the axial direction is provided, and a measuring means for measuring the sliding resistance of the ball spline accompanying the displacement is provided. From the measured sliding resistance value of the ball spline, the ball selected is appropriate. It is now possible to determine whether or not there is.

That is, if a ball looser than the hole diameter of the ball groove is selected, the measured sliding resistance of the ball spline becomes small. On the other hand, if a ball that is too tight is selected, the measured sliding resistance of the ball spline becomes large.

That is, for any ball from a loose ball to a ball that is too tight, it can be determined from the difference in sliding resistance whether an appropriate ball has been selected.

In addition to the above objects, the quality control device according to the second aspect of the present invention has a simple structure and a variable pulley with a fixed sheave so that it is possible to determine whether or not a correct ball has been selected with higher accuracy. A set portion is provided for setting the shaft end in a predetermined direction in which the shaft end faces upward.
It is arranged so as to be able to ascend and descend above the set portion via the floating portion, and a pressing mechanism for pressing the end of the shaft portion by the lowering operation of the shaft end pressing portion is provided to support a plurality of outer peripheral portions of the movable sheave from below. The claw portion is hung up and down via the second floating portion, and a sheave moving mechanism for displacing the movable sheave along the axis of the fixed sheave by the elevating operation of the claw portion is provided. A load cell for detecting the load is provided, and a calculating means for obtaining the sliding resistance of the ball spline from the load detected by the load cell is provided so that it can be determined whether or not the selected ball is appropriate.

That is, after the variable pulley is set on the set portion so that the shaft end of the fixed sheave faces upward, the shaft end holding portion is lowered by the holding mechanism, and the shaft end of the fixed sheave is held by the coaxial end holding portion. Press down. At this time, since the pressing portion is connected to the first floating portion, even if the pressing mechanism side is slightly inclined, the effect of the inclination does not affect the fixed sheave.

Thereafter, the sheave moving mechanism lifts and lowers the movable sheave while supporting the outer periphery of the movable sheave at a plurality of positions with claws from below. At this time, since the claw portion is hung on the second floating portion, even if the sheave moving mechanism side is slightly inclined, the movable sheave is not affected by the inclination and the movable sheave is attached to the shaft portion of the fixed sheave. Go up and down.

The load at this time is detected by the load cell. Then, the sliding resistance of the ball spline is obtained by performing arithmetic processing by the arithmetic means to remove unnecessary load components.

With this structure, the simple sheave and the movable sheave can be used without applying unnecessary external force which causes an error.
As in the case of the first aspect, the ball mounted on the variable pulley can be recognized from the difference in the sliding resistance, and it can be determined with high accuracy whether an appropriate ball has been selected.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on one embodiment shown in FIGS.

FIG. 1 shows a part of a production line of a factory for assembling, for example, a belt type continuously variable transmission (hereinafter referred to as CVT).
Reference numeral 1 denotes a pallet conveyed in the direction of the arrow X along the conveyance path 1, and reference numeral 12 denotes a pulley support jig 12 (corresponding to a set portion) mounted on the upper surface of the pallet 11.

The variable pulley 8 is mounted on the pulley support jig 12 by a work performed at a preceding stage sheave assembly work station (not shown) so that the shaft end of the fixed sheave 1 faces upward. It is. Since the variable pulley 8 has the same structure as that shown in FIG. 3, the description of each part will be omitted using FIG. When the variable pulley 8 is assembled to the pulley support jig 12, the selected ball 6 is pressed into the ball grooves 5 a and 5 b between the shaft portion 2 of the fixed sheave 1 and the hub 4 of the movable sheave 3. There is only a state.

On the other hand, α is, for example, a work station formed at a point immediately after the sheave assembly work station,
Reference numeral 20 denotes a quality control device installed in the work station α. The quality control device 20 is installed at a point above the pallet 11 stopped at the work station α.

If the quality control device 20 is described,
Reference numeral 1 denotes a support top plate installed on an installation portion β formed at a point above the stopped pallet. On the lower surface of the support top plate 21, for example, a plate-shaped cylinder support 23 is suspended in a horizontal state via a pair of rod members 22 descending from the lower surface. At the center of the cylinder support 23, a shaft fixing cylinder 24 (drive source) is installed facing downward. Cylinder 2
4 is positioned at a point corresponding to the center of the shaft end of the fixed sheave 1 stopped at the work station α. Then, this piston 25 is
And extends downward. For example, a rod-shaped shaft end holding member 2 is attached to the tip of the piston 25 via a floating mechanism 26 (for example, a universal joint or the like, which corresponds to a first floating portion).
7 (corresponding to the shaft end holding portion) are freely suspended (connected). The tip of the shaft end holding member 27 facing downward is
It is formed in a conical shape so that it becomes thinner toward the tip. Then, as shown in FIG. 3, the conical portion 27 a at the tip forms a portion that can be engaged and disengaged from the opening edge of the oil hole 7 (small diameter) that is open at the center of the shaft end of the fixed sheave 1. I have.

Reference numeral 28 denotes a guide mechanism for guiding the piston 25. The guide mechanism 28 extends between two upper and lower members, for example, a cylinder support base 23 on both sides of the shaft fixing cylinder 24 and a support member 29 attached to the rear end of the shaft fixing cylinder 24, and a pair of parallel slides. The rod 30 is slidably penetrated, and the pedestal 31 is supported between the lower ends of the rods 30.
A structure in which the primary side (piston side) of the floating mechanism 26 is fixed is used. When the piston 25 moves forward and backward, the primary side of the floating mechanism 26 moves up and down while being positioned. Now, piston 2
5 is moved up and down toward the center (oil hole 7) of the end of the shaft portion 2 of the stationary sheave 1 which has been stopped. When the piston 25 descends, the tip of the shaft end pressing portion 27 is inserted into the oil hole 7 at the end of the shaft portion 2 and is locked with the opening edge of the oil hole 9.

By the combination of the cylinder 24, the floating mechanism 26, the shaft end holding member 27 and the guide mechanism 28, a holding mechanism 33 for holding the shaft end of the variable pulley 8 from above, that is, a mechanism for restraining the fixed sheave 1, is provided. (Constraining means). The shaft end holding member 27 penetrates freely from the center of the receiving table 31.

On the other hand, 35 is a sheave moving mechanism (moving means)
Is shown. The sheave moving mechanism 35 includes a lifting drive unit 36 mounted on the lower surface of the support top plate 21 adjacent to the cylinder 24.
And a sheave support 50 that is raised and lowered by the lifting drive 36.

The lifting drive unit 36 will be described below. Reference numeral 37 denotes a downwardly extending frame member fixed to the lower surface of the support top plate 21. For example, a pair of upper and lower sliders 3 is provided on the side of the frame member 37 on the cylinder 24 side.
A guide rail 38 to which 8a is attached is formed along the vertical direction. A sheave support portion frame 40 formed in, for example, a plate shape is connected to both slide members 38a via an arm 39 extending downward. The frame 40 projects from the end of the arm 39 toward the lower side of the receiving table 31, and the sheave support 50 is attached to the lower surface of the frame 40. The distal end of the shaft end pressing member 27 protrudes downward from a through hole 40a formed in the center of the frame 40.

A servo motor 41 (drive source) is installed downward on the frame member 37 on the upper end side of the guide rail 38. The output shaft 41a of this servomotor 41
Has a screw shaft 4 extending downward through a load cell 42.
3 are connected. The screw portion of the screw shaft 43 is threadably inserted into one of the slides, for example, the upper slide 38a. By this screw insertion, the servo motor 39
When the screw shaft 43 is rotated, the slider 38a is displaced in the up-down direction, so that the entire sheave support 50 moves up and down.

The sheave support 50 will be described.
Reference numeral 2 denotes a plate-shaped support member disposed below the frame 40. In the support member 52, the portions on both sides of the axis of the variable pulley 8 are freely mounted on the lower surface of the frame 40 via floating mechanisms 53 (for example, constituted by universal joints and corresponding to second floating portions). Hanged on. A plurality of telescopic drive units, for example, three cylinders 54 are radially mounted on the outer peripheral side of the lower surface of the support member 52 (only two are shown in the figure). Each of these cylinders 54 is arranged such that the piston 54a faces inward. An I-shaped arm 55 having a pair of upper and lower claws 56 at the lower end is attached to the distal ends of the pistons 54a. A combination of the arm 55 and the cylinder 54 constitutes a chuck 57 (corresponding to a claw) that can be opened and closed in the radial direction. Of course, the claws 56 are arranged so as to face each other inward. The group of claws of the chuck 57 is as follows.
As the cylinder 54 moves forward and backward, the crotch portion of the claw 56 approaches the outer peripheral end of the pulley portion of the movable sheave 3,
The end of the movable sheave 3 opens and closes at a position away from the outer peripheral end of the movable sheave 3. The crotch distance (interval) between the claws 56 is set to be larger than the thickness of the outer peripheral edge of the pulley portion of the movable pulley 8 so that the claws 56 clamp the movable sheave 3 from the radial direction. It is designed to hold you from below without giving too much power. Then, by the combination of the holding of the movable sheave 3 by the claw 56 and the raising operation of the sheave support portion 50 by the servomotor 41, the movable sheave 3 combined with the fixed sheave 1 is pulled out in the direction of extracting the shaft 2. It can be moved along the axis.

That is, the operations of the cylinder 24, the servomotor 41, and the cylinder 54 are all controlled in accordance with a program set in the control unit 60 (for example, a microcomputer). Specifically, the control unit 60 includes, for example, a. A mode in which both the shaft end holding member 27 and the claw 56 in the open state stand by at a standby position above the transport path b. When the pallet 11 stops at the work station α,
A mode in which the cylinder 24 is lowered by a predetermined amount, and the tip of the shaft end holding member 27 is inserted into the oil hole 7 at the center of the shaft end of the fixed sheave 1 to clamp.

C. Similarly, when the pallet 11 is stopped, the servomotor 41 is operated, the claws 56 are lowered by a predetermined amount, and the crotch portion of each claw 56 faces the outer peripheral edge of the movable sheave 3.

D. A mode in which each cylinder 54 is extended by a predetermined amount after the claw 56 is lowered, and each claw 56 is loosely fitted to the outer peripheral edge of the movable sheave 3.

E. After the pawl 56 is loosely fitted, the servo motor 41 is operated to raise the pawl 56 at a predetermined speed.

Each mode is set, and only the movable sheave 3 from the fixed sheave 1 constrained by this mode is moved in the sliding direction of the ball spline.

A through hole 52a through which the shaft portion 2 of the fixed sheave 1 can be inserted is formed at the center of the support member 52 so that the entire support member 52 can be brought close to the shaft end of the movable sheave 3. It is. A springback member 52b is attached to the lower opening edge of the through hole 52a to prevent the ball 6 from jumping out of the ball grooves 5a and 5b during the ascent of the movable sheave 3.

On the other hand, the load cell 42 is loaded with ball splines (ball grooves 5a, 5b, ball 6) based on the load detected by the load cell 42 when the movable sheave 3 is displaced.
Sliding resistance calculation unit 61 for calculating the sliding resistance
(Corresponding to arithmetic means and measuring means) are connected. Thus, a measuring instrument for measuring the sliding resistance of the ball spline is formed. The sliding resistance calculator 61 compares the calculated sliding resistance value with a predetermined sliding resistance value, that is, an appropriate sliding resistance range value when using a ball 6 selected appropriately. The ball selection determining section 62 is connected. With these functions, it is possible to determine whether an appropriate ball 6 has been selected for the ball spline.

The determination will be described in detail. Now, the pallet 11 with the variable pulley 8 (the state up to when the selected ball 6 is pressed) arrives at the work station α and is positioned at the work station α. Stopped.

Then, under the control of the control section 60, the shaft fixing cylinder 24 is extended by a predetermined amount, and the shaft end pressing member 27 waiting above is fixed as shown in FIG. The sheave 1 is lowered toward the center of the end of the shaft 2. Thus, the conical portion 27a at the tip of the shaft end pressing member 27 is inserted into the oil hole 7 opened at the center of the shaft end. The shaft end holding member 27 stops at a point where the slope of the conical portion 27 a is pressed against the opening edge of the oil hole 7. By the pressing performed by the shaft end pressing member 27, the fixed sheave 1 is clamped in the axial direction, and the entire fixed sheave is restrained from moving from the pulley support jig 12 (pallet).
At this time, since the base of the shaft end holding member 27 is connected to the floating mechanism 26, even if the piston 25 of the cylinder 24 is slightly inclined, the oil hole 7
Is fixed, the fixed sheave 1 is maintained in a predetermined upright posture without being affected.

Under the control of the control unit 60, the servomotor 41 is operated, for example, on the downward rotation side in conjunction with, for example, the extension operation of the shaft fixing cylinder 25, and moves the chuck 57 in the open state from the standby position by a predetermined amount. Lower it.
As a result, as shown in FIG.
Stops at the point where the crotch portion of each claw 56 faces the outer peripheral end of the pulley portion of the movable sheave 3.

Subsequently, each cylinder 54 is extended by a predetermined amount under the control of the control unit 60. As a result, each claw 56 is stopped at a point where the crotch portion of the claw 56 approaches the outer peripheral end of the pulley portion of the movable sheave 3 as shown in FIG. Positioning on both sides (up and down) of the outer peripheral edge of the pulley portion of No. 3.

Next, the servo motor 41 rotates in the ascending direction to move the chuck 57 at the set speed.

Then, as shown in FIG. 2D, the movable sheave 3 is lifted by the claws 56 so as to be held from below.

Here, the balls 6 in the ball grooves 5a, 5b
When the movable sheave 3 is lifted, the ball grooves 5a, 5
Do not jump out of b.

At the time of this lifting, since the chuck 57 is suspended by the floating mechanism 53, the movable sheave 3
Is lifted along the axis following the shaft 2 of the fixed sheave 1 without being affected even if the sheave support frame 40 is slightly inclined.

The load at this time is detected by the load cell 42. The detected load includes load components other than the sliding resistance of the ball spline, such as the weight of each component of each mechanism, the weight of the movable sheave 3, and the like.

Therefore, the sliding resistance calculation unit 61 performs an arithmetic process such as subtracting the weight of each part from the measured load.
The sliding resistance of the ball spline in the variable pulley 8 is calculated. That is, the sliding resistance of the ball spline is detected.

Then, the ball selection determining section 62 calculates the sliding resistance value of the ball spline and the preset sliding resistance value, that is, the proper sliding when the ball 6 selected properly is used. A comparison with the resistance range value is performed.

At this time, if the loose ball 6 is selected with respect to the hole diameters of the ball grooves 5a and 5b, the measured sliding resistance of the ball spline becomes small. On the other hand, if a ball that is too tight is selected, the measured sliding resistance of the ball spline becomes large.

That is, it is determined that the measured sliding resistance value of the ball spline is smaller or larger than the set appropriate sliding resistance range value (difference in sliding resistance), and the ball is too tight from the loose ball 6. Any ball 6 up to the ball 6 can be recognized, and it can be determined whether or not an appropriate ball 6 has been selected.

Therefore, it is possible to judge the selected ball 6 with high accuracy, and to reduce unnecessary mechanical loss of the variable pulley 8 and further reduce unnecessary load on the ball 6.

Further, the quality control device includes a pressing mechanism 33 having a floating mechanism 26, a sheave moving mechanism 35 having a floating mechanism 53, a load cell 42,
The structure is such that the movable sheave 3 is displaced in the direction of being pulled out of the fixed sheave 1 from the vertical position by combining the arithmetic means, so that the simple structure has no unnecessary external force which causes an error in the fixed sheave 1 and the movable sheave 3. , It is possible to determine with high accuracy whether an appropriate ball 6 has been selected.

In the above-described embodiment, the sliding resistance of the ball spline is measured by constraining the fixed sheave and moving the movable sheave. The sliding resistance of the ball spline may be measured by restricting and moving the fixed sheave.

In one embodiment, the sliding resistance of the ball spline is measured only when the sheave is lifted (only when the sheave is raised). However, the sliding resistance of the ball spline is also measured when the sheave is lowered. Alternatively, the sliding resistance of the ball spline may be measured by both lifting (elevating) and lowering the sheave, and this may be repeated several times to average. Needless to say, since the actual work (ball spline) is in a wet state, if the measurement is performed in the oil or grease application state, it is needless to say that more effective measurement of the sliding resistance is performed.

[0058]

As described above, according to the first aspect of the present invention, any ball from a loose ball to a ball that is too tight can be determined from the difference in the measured sliding resistance of the ball spline. It is possible to determine whether an appropriate ball has been selected, and to determine with high accuracy whether a ball with a variable pulley incorporated is appropriate.

According to the invention described in claim 2, according to claim 1
In addition to the effects described above, it is possible to determine with high accuracy whether or not an appropriate ball has been selected with a simple structure and without applying unnecessary external force that causes an error to the fixed sheave or the movable sheave.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a quality control device for a variable pulley according to an embodiment of the present invention.

FIG. 2 is a view for explaining a step of measuring a sliding resistance of a ball spline of the variable pulley.

FIG. 3 is a side sectional view for explaining a configuration of a variable pulley.

FIG. 4 is a plan cross-sectional view of the ball spline along the line AA in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fixed sheave 2 ... Shaft part 3 ... Movable sheave 5a, 5b ... Ball groove 6 ... Ball 8 ... Variable pulley 12 ... Pulley support jig (set part) 26 ... Floating mechanism (1st floating part) 27 ... Shaft end holding Member (shaft end holding portion) 33 ... holding mechanism (restraining means) 35 ... sheave moving mechanism (moving means) 42, 61 ... load cell, sliding resistance calculating section (measuring means) 53 ... floating mechanism (second floating section) 57 ... Chuck (claw portion).

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toyoji Ohara 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation F-term (reference) 3J049 AA01 BH02 BH20 CA04

Claims (2)

[Claims] 1. An apparatus for managing the quality of a variable pulley, wherein a movable sheave is externally slidably inserted through a plurality of peripheral ball splines on a shaft portion of a fixed sheave, wherein the variable pulley is configured. Restraining means for restraining one of the fixed sheave and the movable sheave; moving means for displacing the other in the axial direction from the restrained one; and measuring a sliding resistance of the ball spline accompanying the displacement. A quality control device for a variable pulley, comprising: 2. An apparatus for managing the quality of a variable pulley, wherein a movable sheave is externally slidably inserted through a plurality of ball splines around a shaft portion of a fixed sheave, wherein the variable pulley is connected to the fixed sheave. A setting part for setting the shaft part end in a predetermined direction facing upward, and a shaft end holding part for pressing the shaft part end are arranged so as to be able to ascend and descend above the setting part via a first floating part, A pressing mechanism that presses the shaft end by the lowering operation of the shaft end pressing portion, and a claw portion that supports a plurality of locations on the outer periphery of the movable sheave from below are suspended by a second floating portion so as to be able to move up and down. A sheave moving mechanism for displacing the movable sheave along the axis of the fixed sheave by an elevating operation of the claw portion; a load cell for detecting a load when the movable sheave is displaced; Quality control apparatus for a variable pulley from detecting load load cell, characterized by comprising anda calculating means for obtaining the sliding resistance of the ball spline.