JPH09210606A - Ball groove measuring device - Google Patents

Abstract

(57) Abstract: It is possible to measure the angular interval of a plurality of ball grooves formed on the inner peripheral surface or the outer peripheral surface of a blank material with high accuracy with a simple configuration. SOLUTION: A chuck mechanism 30 which holds a first blank material 12a and is rotatable, a rotary encoder 32 which is provided coaxially with the chuck mechanism 30 and detects a rotation angle of the first blank material 12a, A positioning unit 34 that is movable in the axial direction of the first blank 12a is provided. The positioning unit 34 includes the first blank 12
The locating pin 68 is provided with a locating pin 68 that can move back and forth in the diametrical direction of a.
The spherical body 7 that can be fitted into the first ball grooves 24a to 24c of a.
2 is fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball groove measuring device for measuring a plurality of ball grooves formed in a blank material.

[0002]

2. Description of the Related Art Usually, a direct acting type ball groove is widely adopted in order to rotate two rotating bodies integrally and to make each rotating body relatively movable in the axial direction. That is, a plurality of first ball grooves are formed on the inner peripheral surface of one rotating body, and a plurality of second ball grooves corresponding to the first ball grooves are formed on the outer peripheral surface of the other rotating body. A plurality of spheres are integrally interposed in the first and second ball grooves.

By the way, as described above, when a plurality of ball grooves are formed on the inner peripheral surface or the outer peripheral surface of the rotating body at predetermined angular intervals, the distance between the ball grooves is within a desired angular range. Must be set to. For example, when three ball grooves are formed on the rotating body at equal angular intervals, it is desired that the angles between the ball grooves are formed within an angle range of 120 ° ± several minutes.

Therefore, it is conceivable to use the technique disclosed in Japanese Patent Publication No. 3-59361, for example.
That is, in this conventional technique, four contactors are brought into contact with the raceway groove surface of the double-row raceway of the ball bearing, and two contactors facing each other in the axial direction of the double-row raceway are measured upward. It is characterized in that an optimum representative characteristic value of the raceway groove dimension of the double-row raceway is obtained by fixedly mounting the upper portion and the lower measuring portion and measuring the relative displacement of the upper measuring portion and the lower measuring portion.

[0005]

However, in the above-mentioned prior art, the double row bearing ring of the ball bearing is targeted,
It cannot be used directly for measuring direct acting ball grooves. Moreover, for example, when three linear motion type ball grooves are formed on the inner peripheral surface of the rotating body at equal angular intervals, the distance between the ball grooves is caused by the processing conditions and heat generated during processing. Is easy to change. Therefore, even if the spherical contacts are simultaneously arranged in the ball grooves and the positional relationship between the spherical contacts is detected, it has been pointed out that the angular interval of the ball grooves cannot be accurately measured. There is.

Further, the above-mentioned prior art is for measuring the raceway groove surface of a finished double row ball bearing, and for measuring the raceway groove dimension in the state of a blank material which is a raw material before finishing. is not. However, if an angular error exceeding a permissible range is generated in the ball groove machined in the blank material by cutting or precision forging, the ball groove grinding in the next step causes uneven contact of the grindstone. For this reason, there is a problem in that defective products are more likely to occur due to uneven wear of the grindstone, residual black skin, and the like.

The present invention is to solve this kind of problem, and to measure the angular intervals of a plurality of ball grooves formed on the inner peripheral surface or the outer peripheral surface of a blank material with a simple structure and with high accuracy. An object of the present invention is to provide a ball groove measuring device capable of performing the above.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of ball grooves formed on the peripheral surface of a blank material while the blank material is held by a chuck mechanism. , The positioning pin is inserted into any one ball groove. Next, after removing the positioning pin from the one ball groove, the chuck mechanism is rotated to index another ball groove of the blank material, and the positioning pin is inserted into the other ball groove.

As described above, the positioning pins are sequentially inserted into the plurality of ball grooves, and the angular positions of the blank material into which the positioning pins are inserted are detected by the rotation angle detecting mechanism. This makes it possible to easily and accurately detect the angular interval between the ball grooves with a simple configuration.

Further, since the angular intervals of the ball grooves are detected in the blank material state, if the detected angular intervals exceed the allowable range, the ball groove grinding process which is the next step may proceed. It is possible to reliably remove defective blank materials.

When a ball groove is formed on the inner peripheral surface of the blank material, the chuck mechanism grips the blank material with the outer peripheral side as a reference, and a push pin having a tapered tip is pressed through a positioning pin. The ball groove angle measurement work is performed. At this time, the positioning pin moves back and forth in the diametrical direction of the blank material under the pressing action of the push rod that engages with the spring member, so that it is possible to easily cope with the change in the size of the blank material.

Furthermore, when a ball groove is provided on the outer peripheral surface of the blank material, the chuck mechanism grips the blank material with both ends as a reference, and the positioning pin engages with the ball groove under the pressing action of the spring member. . As a result, it becomes possible to easily detect the angular intervals of the ball grooves provided on the outer peripheral surface of the blank material having various dimensions.

[0013]

1 is a longitudinal sectional view of a shaft 10 and a movable pulley 12 formed by finishing a blank material described later. On the outer peripheral surface of the shaft 10, 3
The linear motion type ball grooves 14a to 14c are formed at equal angular intervals, and three linear motion type ball grooves 16a to 16c are similarly formed on the inner peripheral surface of the movable pulley 12. A plurality of spheres 18 are provided between the ball grooves 14a to 14c and 16a to 16c, respectively.

2 and 3 show a measuring device 20 according to the first embodiment in which a first blank 12a which is a raw material before finishing of the movable pulley 12 is used. The first blank 12a is provided with three first ball grooves 24a to 24c on the inner peripheral surface 22 at equal angular intervals (120 ° intervals), and the outer circumference 26 and the outer periphery 26 of the first blank 12a are provided. The outer peripheral end surface 28 is previously processed to form a reference surface. This first ball groove 24a
To 24c are ball grooves 16a to 16c of the movable pulley 12.
It corresponds to.

The measuring device 20 is provided with a chuck mechanism 30 which holds the first blank material 12a and is rotatable, and the first blank material 12a which is provided coaxially with the chuck mechanism 30 and is gripped by the chuck mechanism 30. Rotary encoder 32 as a rotation angle detection mechanism for detecting the rotation angle of
And the axial direction of the first blank 12a (direction of arrow A)
And a movable positioning unit 34.

The chuck mechanism 30 comprises a housing 38 fixed on a base 36, and a spindle 42 is rotatably supported in the housing 38 via a bearing 40. The chuck portion 44 is connected to one end side of the spindle 42, and the chuck portion 44 has a plurality of chuck claws 46 that can advance and retreat in the diameter direction (arrow B direction) of the first blank 12a. A step portion 48 that engages with the outer circumference 26 and the outer circumference end surface 28 of the first blank material 12 a is formed on the tip end side of the chuck claw 46. The rotary encoder 32 is connected to the other end of the spindle 42 via a joint 49.

A guide rail 50, which extends in the direction of arrow A and faces the housing 38, is fixedly mounted on the base 36.
The positioning unit 34 is mounted on the guide rail 50 via the linear guide 52 so as to be movable back and forth. The positioning unit 34 is coaxially formed through the screw hole 54 and the first hole portion 56 in the direction of arrow A, and is oriented vertically downward on the tip side of the first hole portion 56. Second hole 58
Communicate.

As shown in FIG. 2, an adjusting screw 60 is screwed into the screw hole 54 to a predetermined depth, and the first hole portion 56 is formed.
A push rod 64 is arranged in the direction of arrow A so as to be movable back and forth in the direction of arrow A via a spring member 62. A tapered portion 66 is formed at the tip of the push rod 64, and one end of a positioning pin 68 that is arranged in the second hole portion 58 so as to be movable back and forth in the direction of arrow B has the tapered portion 66. A tapered surface 70 is formed to be engaged with the positioning pin 68.
A spherical body 72 is fixed to the other end of the. The forward end position of the positioning unit 34 is located at the stopper 7 fixed to the base 36.
It is regulated by 4.

The operation of the measuring apparatus 20 according to the first embodiment configured as described above will be described below.

First, as shown in FIG. 2, the outer periphery 26 and the outer peripheral end face 28 of the first blank 12a constitute each chuck claw 30 in a state where the positioning unit 34 is arranged at the position indicated by the chain double-dashed line. The first blank 12a is pressed by the stepped portion 48 of 46 and is positioned and held.

Among the first ball grooves 24a to 24c of the first blank 12a, for example, the first ball groove 24a.
Is positioned downward, the positioning unit 34 is moved to the first blank 12a side along the guide rail 50. Therefore, the spherical body 72 of the positioning pin 68 is
The first blank 12a is inserted into the first ball groove 24a from the inner peripheral surface 22 side (see FIG. 4), and is moved until the positioning unit 34 comes into contact with the stopper 74.

As shown in FIG. 2, the positioning unit 34
Comes into contact with the stopper 74, and the spherical body 7 of the positioning pin 68 is
The angular position at which 2 is inserted into the first ball groove 24a of the first blank 12a is the reference angular position of the first blank 12a. That is, the output of the rotary encoder 32 is set to (0) at this angular position.

Next, after the positioning unit 34 is retracted rearward along the guide rail 50, the chuck mechanism 3
0 is rotated integrally with the spindle 42 under the guiding action of the bearing 40 by a predetermined angle, that is, 120 °.
Then, when the positioning unit 34 is moved to the chuck mechanism 30 side, the spherical body 72 of the positioning pin 68 moves from the inner peripheral surface 22 side of the first blank material 12a to the first ball groove 2 side.
4b, and moves to the chuck mechanism 30 side along the first ball groove 24b. Here, the first ball groove 24b
Is displaced to the left or right with respect to the spherical body 72, the first ball groove 2 is moved by the advancing operation of the spherical body 72 or by rotating the chuck mechanism 30.
The spherical body 72 corresponds to 4b.

At this time, when the chuck mechanism 30 rotates,
The rotary encoder 32 coaxially connected to the spindle 42 constituting the chuck mechanism 30 via a joint 49 rotates. Therefore, the rotary encoder 32 detects the angular position of the first blank 12a when the spherical body 72 is fitted into the first ball groove 24b.

Similarly, the positioning unit 34 is temporarily moved to the first position.
After being separated from the blank 12a, the chuck mechanism 30
Is rotated by 120 ° integrally with the first blank 12a. Next, the positioning unit 34 is advanced and displaced, and the spherical body 72 of the positioning pin 68 is fitted into the first ball groove 24c. In this state, the angular position of the first blank 12a is detected via the rotary encoder 32.

In this case, in the first embodiment, while the first blank 12a is gripped by the chuck mechanism 30, the first blank 12a is rotated by a predetermined angle, for example, 120 °, and the positioning pin 68 is set at each angular position. First spherical body 72
The rotary encoder 32 detects the angular position of the first blank material 12a at that time by inserting the ball into the ball grooves 24a to 24c. Therefore, the first ball grooves 24a-2
It is possible to easily and accurately measure the angular position of 4c with an extremely simple structure.

Moreover, the tapered surface 70 provided at one end of the positioning pin 68 is engaged with the tapered portion 66 of the push rod 64 biased by the spring member 62, and the arrow of the positioning pin 68 is shown. The amount of protrusion in the B direction can be adjusted. Therefore, even if the diameter of the inner peripheral surface 22 of the first blank material 12a changes, it can be easily dealt with only by screwing the adjusting screw 60, and there is an advantage that the versatility is excellent.

Further, before forming the movable pulley 12,
In the state of the first blank 12a, the first ball grooves 24a-2
The angular spacing of 4c is measured. As a result, the quality of the ball grooves 16a to 16c at the stage of the blank 12a can be reliably determined from the measurement work of the first ball grooves 24a to 24c. Then, if the first blank material 12a determined to be defective is excluded, the defective first blank material 1
By performing ball groove grinding on 2a, it becomes possible to prevent uneven wear of the grindstone due to uneven contact of the grindstone or defective products. As a result, there is an advantage that the movable pulley 12 can be manufactured efficiently.

5 and 6 show a measuring device 80 according to a second embodiment in which the second blank 10a, which is a raw material before the finishing of the shaft 10, is used. Center holes 82a and 82b as positioning reference holes are provided at both ends of the second blank 10a, and
The outer circumference 84 has three second ball grooves 86a to 86c.
Extend in the axial direction (direction of arrow A) and are 120 ° to each other
They are provided separately from each other. This second ball groove 86a
86c correspond to the ball grooves 14a to 14c of the shaft 10.

The measuring apparatus 20 according to the first embodiment
The same components as those of the above are denoted by the same reference numerals, and detailed description thereof will be omitted.

The measuring device 80 comprises a chuck mechanism 88 for gripping the second blank material 10a with reference to both ends of the second blank material 10a. The chuck mechanism 88 has a center hole 82a in the second blank material 10a. Has a front center 90 that engages with the rear center 92 that engages with the center hole 82b.

The front center 90 is coaxially fixed to the spindle 42, and the chuck 94 that holds the outer periphery of the end of the second blank 10a on the side of the center hole 82a is fixed to the front center 90. Has been done. Chuck part 94
Has a plurality of set screws 96 and screws 98 for pressing the outer circumference of the end of the second blank 10a.

The main body 100 is erected on the base 36, and the hole 1 formed in the direction of arrow A of the main body 100.
A rear center 92 is provided at 02 so as to be movable back and forth. The locking member 104 is arranged on the end side of the hole 102,
The front end of the locking member 104 and the hole 10 of the rear center 92
6, a spring 108 is interposed, and the rear center 92 is constantly pressed toward the chuck mechanism 88. Rear center 9
2 is provided with a handle 110 protruding outward.

The position of the main body 100 can be changed according to the size of the second blank 10a, and can be positioned at two positions on the base 36 according to the axial length of at least two kinds of the second blanks 10a. Is configured.

The positioning unit 112, which constitutes the measuring device 80, is mounted on a guide rail 114 fixed on the base 36 in the direction of arrow A so as to be movable back and forth.
On the upper part of the positioning unit 112, as shown in FIG. 6, the diametrical direction of the second blank 10a (direction of arrow B).
A hole portion 116 is formed to extend in the
A positioning pin 120 that can move forward and backward is directly arranged via the spring member 118. At the tip of the positioning pin 120,
A spherical body 122 protruding toward the second blank 10a is provided, and at the rear end of the positioning pin 120,
A rod 124 protruding from the positioning unit 112 to the outside is connected.

A guide rail 126 is provided on the housing 38 in the direction of arrow A.
A slider 128 is supported by 26. The slider 128 extends in the direction of arrow A, and the rod 1 is attached to the tip of the slider 128.
Depth measuring dial gauge 130 engaging the end of 24
Is installed.

The operation of the measuring device 80 thus constructed will be described below.

First, with the positioning unit 112 placed in a predetermined standby position, the rear center 92 of the chuck mechanism 88 moves forward against the spring 108 by pulling the handle 110 in the direction of arrow C. It is displaced in a direction away from the partial center 90. And the second blank 1
0a is arranged with the center holes 82a and 82b corresponding to the front center 90 and the rear center 92, respectively.
Tensile force of 10 is released. Therefore, the rear center 92
Moves to the front center 90 side via the spring 108,
It engages with the center hole 82b of the blank 10a. Also,
The outer periphery of the end of the second blank 10a on the side of the center hole 82a is held by the chuck 94. As a result, the second blank material 10 a is positioned and supported via the chuck mechanism 88.

Next, the second blank material 10a held by the chuck mechanism 88 is rotated to move the second ball groove 86.
a is disposed so as to face the positioning pin 120 of the positioning unit 112, and the spherical body 122 of the positioning pin 120 is fitted into the second ball groove 86a. At this angular position, the output of the rotary encoder 32 is set to (0).

Therefore, the rod 124 is indicated by an arrow D in FIG.
The second blank 10a is rotated by a predetermined angle, that is, 120 ° in a state of being pulled in the direction and separating the spherical body 122 from the second ball groove 86a. Next, when the tension of the rod 124 is released, the positioning pin 120 moves to the second blank 10a side through the elastic force of the spring member 118, and the spherical body 122 fits into the second ball groove 86b.

Here, when the second blank 10a is rotated, the rotary encoder 32 is moved through the spindle 42 and the joint 49 integrally provided in the front center 90.
Is rotated, and the angular position of the second blank material 10a when the positioning pin 120 is fitted into the second ball groove 86b is detected. Further, the second blank 10a is rotated by 120 °, and the positioning pin 120 is inserted into the second ball groove 86c.
The second blank material 10 when the spherical body 122 of FIG.
The angular position of a is detected by the rotary encoder 32.

In this case, in the second embodiment, the output of the rotary encoder 32 is (0) at the angular position where the spherical body 122 of the positioning pin 120 fits into the second ball groove 86a.
And the second blank 10a is rotated by 120 ° and the spherical body 122 is inserted into the second ball grooves 86b and 86c.
The rotary encoder 32 sequentially detects the angular position of the second blank 10a when the two are fitted. Therefore,
Whether or not each of the second ball grooves 86a to 86c is formed within a predetermined angular error range can be easily and surely detected with an extremely simple configuration, and the same effect as that of the first embodiment described above. Is obtained.

Further, in the measuring device 80, the position of the positioning pin 120 in the depth direction is constantly detected via the dial gauge 130. This makes it possible to detect with high accuracy whether or not the positioning pin 120 is fitted in the second ball grooves 86a to 86c of the second blank material 10a, and the angle of the second ball grooves 86a to 86c. There is an effect that the measurement work is performed more accurately.

On the rear center 92 side, the main body 10
0 is configured to be positionally adjustable at at least two positions on the base 36. Therefore, it is possible to easily deal with various second blank materials 10a having different sizes, and there is an advantage that the versatility is excellent.

[0045]

As described above, in the ball groove measuring device according to the present invention, the blank material gripped by the chuck mechanism is rotated, and a plurality of ball grooves preformed on the peripheral surface of the blank material. By detecting the angular position when the locating pin is fitted in, the angular interval of the ball groove can be detected easily and with high accuracy. Moreover,
The configuration is extremely simplified, and the cost of the entire measuring device is easily reduced.

Further, by eliminating the blank material judged to be defective, the defective blank material is not sent to the ball groove grinding processing which is the finishing processing. As a result, it is possible to effectively prevent uneven wear of the whetstone and defective products,
An efficient manufacturing process becomes possible.

[Brief description of drawings]

FIG. 1 is an explanatory longitudinal sectional view of a shaft and a movable pulley manufactured from a blank material applied to a measuring device of the present invention.

FIG. 2 is a partial cross-sectional side view of the measuring device according to the first embodiment of the present invention.

FIG. 3 is a partial cross-sectional plan view of the measuring device according to the first embodiment.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a partial cross-sectional side view of the measuring device according to the second embodiment of the present invention.

FIG. 6 is a partial cross-sectional plan view of the measuring device according to the second embodiment.

7 is a sectional view taken along line VII-VII in FIG.

[Explanation of symbols]

10 ... Shaft 12 ... Movable pulley 10a, 12a ... Blank material 14a-14c, 16a-16c, 24a-24c, 8
6a to 86c ... Ball groove 20, 80 ... Measuring device 22 ... Inner peripheral surface 26, 84 ... Outer peripheral surface 28 ... Outer peripheral end surface 30, 88 ... Chuck mechanism 32 ... Rotary encoder 34, 112 ... Positioning unit 42 ... Spindle 44, 94 ... Chuck Part 60 ... Adjusting screw 62, 118 ... Spring member 64 ... Push rod 66 ... Tapered part 68, 120 ... Positioning pin 72, 122 ... Spherical body 74 ... Stopper 82a, 82b ... Center hole 90 ... Front center 92 ... Rear center 100 ... Main body 108 ... Spring 124 ... Rod

Claims (3)

[Claims] 1. A chuck mechanism that holds a blank material and is rotatable, and a rotation angle detection mechanism that is provided coaxially with the chuck mechanism and that detects a rotation angle of the blank material held by the chuck mechanism. It has a positioning pin that is fitted into one of a plurality of ball grooves preformed on the peripheral surface of the blank material and is pressed in the diameter direction of the blank material via a spring member, and moves in the axial direction of the blank material. A ball groove measuring device comprising: a flexible positioning unit. 2. The measuring device according to claim 1, wherein the blank material is provided with the plurality of ball grooves on an inner peripheral surface thereof, and the chuck mechanism uses the outer peripheral and outer peripheral end surfaces of the blank material as a reference. The positioning unit is arranged so as to be movable back and forth coaxially with the chuck via the spring member, and has a tip-shaped push rod engaged with the push rod. A ball groove measuring device comprising: the positioning pin capable of advancing and retracting in the diametrical direction of the blank material; 3. The measuring device according to claim 1, wherein the blank material is provided with the plurality of ball grooves on an outer peripheral surface thereof, and the chuck mechanism is a chuck for gripping with reference to both ends of the blank material. The ball groove measuring device according to claim 1, wherein the positioning unit includes the positioning pin which is directly engaged with the spring member and is capable of advancing and retracting in the diametrical direction of the blank material.