JP4284240B2 - Dimension measuring method and apparatus of constant velocity joint. - Google Patents

Description

  The present invention relates to a constant velocity joint dimension measuring method and apparatus for measuring the distance (offset amount) from the center of a spherical inner surface to the center of a ball groove in an outer member of a barfield type constant velocity joint.

  FIG. 5 is a schematic cross-sectional view of a conventionally known Barfield type constant velocity joint (hereinafter also simply referred to as a constant velocity joint) 10. The constant velocity joint 10 includes an outer member 12, an inner member 14, and a rolling ball 16 interposed between the outer member 12 and the inner member 14.

  The outer member 12 includes a shaft portion 18 and an open cylindrical portion 20, and six ball grooves 22 a to 22 f spaced apart from each other at equal angles are provided on the curved inner wall of the cylindrical portion 20. ing.

  The inner member 14 is inserted into the cylindrical portion 20 while being held by a retainer 24. The inner member 14 is provided with the same number of inner side ball grooves 26a to 26f as the ball grooves 22a to 22f of the outer member 12. On the other hand, the retainer 24 has a window penetrating from the inner wall to the outer wall of the retainer 24. 28 is provided. The rolling ball 16 is accommodated in the window 28 and is inserted into the ball grooves 22 a to 22 f of the outer member 12 and the inner side ball grooves 26 a to 26 f of the inner member 14.

  In this type of constant velocity joint 10, when the intersection of the center line L of the constant velocity joint 10 and the perpendicular drawn from the center of the rolling ball 16 toward the center line L is C point, the inner side ball The point A which is the center of curvature (r) of the grooves 26a to 26f and the point B which is the center of curvature (R) of the ball grooves 22a to 22f are spaced apart from the point C at equal intervals, and AC = BC is established. In other words, it is ideal that the points A and B are offset at an equal distance from the point C. Here, the point A is designated as the center of the spherical inner surface, and the point C is designated as the center of the ball groove.

  However, the dimensions of the outer members 12 continuously produced by forging are not necessarily completely the same, and there are some variations from the reference value. Therefore, as shown in FIG. 5, after measuring the distances a and b from the closed end surface of the cylindrical portion 20 to the points B and C, the offset amount is calculated by subtracting a from the b. If it is within a preset allowable range, it is selected as a suitable outer member, and if it is outside the allowable range, it is selected as inappropriate.

  This sorting operation is also performed when a post-forging process, for example, heat treatment or machining such as grinding is completed.

  As an outer member dimension measuring apparatus used at this time, for example, those described in Patent Documents 1 to 3 are known.

Japanese Utility Model Publication No. 58-6205 Japanese Utility Model Publication No. 57-68505 Japanese Utility Model Publication No. 56-169202

  In any of the dimension measuring apparatuses described in Patent Documents 1 to 3, it is necessary to perform an operation for measuring the distance a and an operation for measuring the distance b. That is, in the dimension measuring apparatus according to the prior art, the dimension measurement must be performed twice. Performing such an operation is complicated and causes a problem that the measurement cannot be performed efficiently.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a constant velocity joint dimension measuring method and apparatus capable of easily and efficiently obtaining an offset amount with a simple operation. .

In order to achieve the above object, the present invention provides a constant velocity joint dimension measuring method for measuring the distance from the center of the spherical inner surface of the constant velocity joint outer member to the center of the ball groove,
The outer member that serves as a measurement reference in which the distance from the center of the spherical inner surface to the center of the ball groove is measured in advance is supported, and several of the ball grooves provided on the inner wall of the open cylindrical portion of the outer member are provided. Insert each ball,
Protruding a measuring element arranged between the balls and bringing it into contact with the inner wall of the cylindrical part, the amount of displacement of the measuring element up to the contact as a reference displacement amount,
While supporting the outer member to be measured, insert the balls into several balls in the ball groove provided on the inner wall of the cylindrical portion of the outer member,
The probe is protruded and brought into contact with the inner wall of the cylindrical part,
A difference between the displacement amount of the measuring element reaching the contact and the reference displacement amount is calculated.

  That is, in the present invention, an outer member having an offset amount of a predetermined value is used as a measurement reference, and the dimension of the reference outer member is compared with the dimension of the outer member to be measured. For this reason, the offset amount of the outer member to be measured can be easily obtained by one simple dimension measurement.

  Therefore, according to the present invention, the offset amount can be measured quickly, and the measurement efficiency can be improved after all.

  In this measurement method, when the difference between the displacement amount of the measuring element and the reference displacement amount is within a preset range, it may be determined that the dimensional accuracy of the inner member is within an allowable range. Good.

The present invention is also a constant velocity joint dimension measuring device for measuring the distance from the center of the spherical inner surface of the outer member of the constant velocity joint to the center of the ball groove,
The base,
A support portion that is erected on the base and supports the cylindrical portion that is opened by the outer member;
A holding part that is disposed above the support part and holds the shaft part of the outer member;
A plurality of balls provided in a number smaller than the number of the track grooves, and are individually inserted into a plurality of track grooves provided on the inner wall of the cylindrical portion by being positioned and fixed to the tip of the support portion;
A measuring element disposed between the balls and contacting or separating from the inner wall of the cylindrical portion;
A displacement mechanism for bringing the measuring element into contact with or separating from the inner wall of the cylindrical portion;
A displacement amount display unit for displaying a displacement amount of the measuring element until the contact is reached when the measuring element contacts the inner wall of the cylindrical portion;
It is characterized by having.

  With such a configuration, the displacement amount of the probe corresponding to the offset amount can be measured easily and simply.

  In this type of dimension measuring apparatus, in order to make the measuring element close to or away from the inner wall of the cylindrical portion, for example, the measuring element is installed on the rotating member, and the rotating member is rotated. The probe may be displaced. That is, the measuring element is rotated while the other end of the rotating member having the measuring element fixed to the one end is pressed by the pressing member to move toward the inner wall of the cylindrical portion. What is necessary is just to space apart from the inner wall of a cylindrical part in connection with the other end part of a member being released from the pressing force of a pressing member.

  According to the present invention, the offset amount can be easily obtained by one simple dimension measurement. For this reason, the time required for dimension measurement can be shortened, and the measurement efficiency can be improved.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a method for measuring dimensions of a constant velocity joint according to the present invention will be described in detail with reference to the accompanying drawings.

  A schematic overall perspective view of a constant velocity joint dimension measuring apparatus (hereinafter also simply referred to as a dimension measuring apparatus) according to the present embodiment is shown in FIG. 1, and a longitudinal sectional view of the main part is shown in FIG. The dimension measuring device 30 includes a base 32, a support portion 34 erected on the base 32, and a holding rod 38 as a holding portion disposed above the support portion 34 via a columnar member 36. The three balls 40a to 40c positioned and fixed to the tip of the support portion 34, the measuring element (see FIG. 2) 42 disposed between the balls 40a and 40c, and the measuring element 42 are rotated. It has a displacement mechanism 44 for moving and a micro gauge 46 as a displacement amount display unit for displaying the displacement amount of the measuring element 42.

  As shown in FIG. 2, the base 32 is a hollow body having a side plate 48 and a top plate 50, and the side plate 48 includes a protruding plate 52 extending toward the center of the base 32. Are connected. 2 shows a state in which the outer member 12 shown in FIG.

  A screw 54 is screwed to the protruding plate 52. Inside the screw 54 that has been prevented from coming off by the nut 56, there are a coil spring (not shown) and a pressing pin 60 that protrudes from the screw 54 and is constantly elastically biased upward in FIG. 2 under the action of the coil spring. Contained.

  The front end portion of the pressing pin 60 contacts the rotating member 62. The rotating member 62 includes a long horizontal portion 64 extending along the X direction in FIGS. 1 and 2, and a vertical portion 66 rising vertically from one end portion of the horizontal portion 64. The portion 64 is provided with a stepped portion 68 with the upper end surface slightly depressed. On the other hand, the vertical portion 66 is inserted into a notch portion 70 provided in the support portion 34 and is rotatably supported by a shaft support portion 72 installed in the vicinity of the support portion 34 via a screw 74. .

  Further, a probe connecting portion 76 is formed to project from the tip surface of the vertical portion 66, and the probe 42 is disposed on the probe connecting portion 76 so as to face the columnar member 36 (see FIG. 2). ).

  As described above, the three balls 40 a to 40 c are installed at the tip of the support portion 34. That is, the support portion 34 includes a rod-shaped member 78 erected on the top plate 50 of the base 32, a large-diameter portion 80 provided on the rod-shaped member 78, and a flange fitted to the tip surface of the rod-shaped member 78. And the balls 40 a to 40 c are sandwiched between the large-diameter portion 80 and the flange member 82.

  The lever 84 constituting the displacement mechanism 44 is installed at one corner of the base 32 (see FIG. 1). A rotation pressing member 90 is positioned and fixed to a substantially middle portion of the bar member 88 that is coupled to the lever 84 and pivotally supported by bearing members 86a and 86b installed on the base 32. ing. As can be understood from FIGS. 1 and 2, the top plate 50 of the base 32 is formed with a long groove 92 along the arrow X direction, and the curved pressing surface of the rotary pressing member 90 is The step portion 68 is pressed by contacting the end portion of the step portion 68 of the rotating member 62 through the groove 92.

  An L-shaped stay 98 having a substantially L-shaped cross section having a bottom wall portion 94 and a hanging wall portion 96 is installed on the base 32, and the hanging wall portion 96 of the L-shaped stay 98 includes A long hole 100 is provided along the arrow X direction.

  The bolt 102 passed through the elongated hole 100 is screwed into a rectangular parallelepiped micro gauge stay 104. Thereby, the microgauge stay 104 is positioned and fixed so as to extend in the vertical direction (arrow Y direction) with respect to the longitudinal direction (arrow X direction) of the groove 92.

  The microgauge stay 104 is screwed with a measuring core 106 constituting the microgauge 46. And the front-end | tip part of this measurement core 106 protruded from the lower end surface of the micro gauge stay 104 is contact | abutted to the step part 68 of the rotation member 62 through the groove | channel 92 (refer FIG. 2).

  The scale plate of the micro gauge 46 can be rotated. That is, the place (origin) where 0 is attached on the scale plate can be set at an arbitrary position.

  A connecting member 108 is connected to a side surface of the columnar member 36 facing the support portion 34, and the holding rod 38 is disposed above the support portion 34 via the connecting member 108. That is, in the connecting member 108, the large through hole 110 and the two small through holes 112a and 112b are arranged in parallel so that the two small through holes 112a and 112b sandwich the large through hole 110. The holding bar 38 is positioned above the support portion 34 by passing through the large through hole 110. Further, return rod members 114a and 114b are passed through the small through holes 112a and 112b, respectively, and the holding rod 38 and the return rod members 114a and 114b each have a connecting bar 116 passed through each head. Are connected to each other.

  A conical portion 118 is provided at the lower end of the holding rod 38.

  Large diameter disc portions 120a and 120b are respectively provided at lower ends of the return rod members 114a and 114b, and one end portions of coil springs 122a and 122b are seated on the large diameter disc portions 120a and 120b. ing. The other end portions of the coil springs 122a and 122b are seated on the lower end surface of the connecting member 108, whereby the return rod members 114a and 114b are always elastically biased toward the support portion 34.

  A handle lever support member 124 is connected above the connecting member 108, and the handle lever 126 inserted into the insertion groove 125 of the handle lever support member 124 is pivotally supported by a rotation shaft 128. Yes. A gripping member 130 having a substantially U-shaped cross section is attached to the distal end portion of the handle lever 126, and the connecting bar 116 is inserted into U-shaped grooves 132 a and 132 b provided at the distal end portion of the gripping member 130. Are fitted through spacers 134a and 134b.

  The dimension measuring apparatus 30 according to the present embodiment is basically configured as described above. Next, the function and effect will be described in relation to the dimension measuring method.

  First, an outer member 12 of a barfield type constant velocity joint 10 having a predetermined offset amount is prepared, and this outer member 12 is used as a measurement reference (hereinafter, this outer member is also referred to as a reference outer member).

  As shown in FIG. 5, the outer member 12 has a shaft portion 18 and an open cylindrical portion 20, and six balls separated from each other at an equal angle are formed on the curved inner wall of the cylindrical portion 20. Grooves 22a to 22f are provided. When the outer member 12 is attached to the dimension measuring device 30, the lever 84 is put on standby at the position of the two-dot chain line in FIG. 3, and the handle lever 126 is rotated in the direction of arrow A in FIG. Along with this, the connecting bar 116 held by the holding member 130 rises, and as a result, the holding bar 38 and the return bar members 114a and 114b are displaced upward. At this time, the coil springs 122a and 122b are compressed.

  Next, while maintaining the state in which the handle lever 126 is rotated, as shown in FIG. 2, the outer member 12 is placed on the support portion 34 so that the tubular portion 20 covers the support portion 34. At this time, as shown in FIG. 4 which is a sectional view taken along the line IV-IV in FIG. 3, the ball 40a of the support portion 34 is inserted into the three ball grooves 22a, 22c and 22e in the six ball grooves 22a to 22f. ~ 40c is inserted. When the perpendicular drawn from the center of the balls 40a to 40c inserted into the ball grooves 22a, 22c, and 22e toward the center line L (see FIG. 5) of the outer member 12 intersects at the point C, the ball 40a ˜40c is blocked and no longer inserted into the ball grooves 22a, 22c, 22e. As a result, the outer member 12 stops.

  As understood from this, as the reference outer member 12, a member that stops the balls 40a to 40c at a point where AC and BC shown in FIG. 5 are equal to each other is selected.

  When the handle lever 126 is released after the balls 40a to 40c are fitted into the ball grooves 22a, 22c, and 22e, the coil springs 122a and 122b are extended to expand the large-diameter disk portions of the return rod members 114a and 114b. 120a and 120b are elastically biased downward in FIG. Accordingly, following the rotation of the handle lever 126 in the direction of the arrow B, the return rod members 114a and 114b, and the holding rod 38 connected to the return rod members 114a and 114b via the connecting bar 116, Is displaced downward. The conical portion 118 of the holding rod 38 is finally inserted into the recess 136 provided on the distal end surface of the shaft portion 18 of the outer member 12, whereby the outer member 12 is held in an inverted posture (see FIG. 2).

  That is, the reference outer member 12 is positioned and fixed when the balls 40 a to 40 c are inserted to the same position as the rolling ball 16.

  Next, as shown in FIG. 3, when the lever 84 is rotated in the direction of arrow C, the curved pressing surface of the rotating pressing member 90 is separated from the stepped portion 68 of the rotating member 62. Along with this, the rotating member 62 is released from the pressing force of the rotating pressing member 90, while the pressing pin 60 is elastically biased by the coil spring accommodated in the screw 54. Accordingly, the pressing pin 60 further protrudes upward in FIG. 2 and presses the lower end surface of the step portion 68 of the rotating member 62.

  When the rotating member 62 is pressed in this manner, the vertical portion 66 rotates toward the inner wall of the cylindrical portion 20 with the screw 74 that pivotally supports the vertical portion 66 as a fulcrum. At the same time, the measuring core 106 of the micro gauge 46 is pressed by the stepped portion 68 and displaced upward. This displacement amount is displayed on the micro gauge 46 as a change amount of the pointer.

  The tip of the measuring element 42 finally comes into contact with the inner wall of the cylindrical portion 20 as shown in FIG. By this contact, the rotation of the rotation member 62 and the upward displacement of the measurement core 106 are completed. The pointer of the micro gauge 46 displays the amount of displacement of the measuring core 106 up to this point.

  In order to use this displacement amount as a reference for measuring the offset amount in the other outer member, zero correction is performed. That is, the dial of the micro gauge 46 is rotated and the current position of the pointer is set as the origin.

  Thus, after measuring the displacement amount of the measuring element 42 corresponding to the offset amount of the reference outer member 12 as the displacement amount of the measuring core 106 of the micro gauge 46, the lever 84 is moved in the direction of arrow D (FIGS. 1 and 2). And FIG. 3). As a result, the rotation pressing member 90 presses the step portion 68 again, and as a result, the vertical portion 66 and the measuring element 42 of the rotation member 62 rotate in a direction away from the inner wall of the cylindrical portion 20 with the screw 74 as a fulcrum. To do. Further, when the pressing pin 60 is pressed from the lower end surface of the horizontal portion 64 of the rotating member 62, the coil spring is compressed and recessed into the screw 74. Of course, the measuring core 106 is displaced downward to return to the original position, and accordingly, the pointer of the micro gauge 46 is also displaced to the original position. As described above, since the position after the displacement of the pointer is corrected to the origin, the pointer returned to the original position shows a minus of the dial.

  Thereafter, when the handle lever 126 is rotated in the direction of the arrow A in FIG. 1, the connecting bar 116 is raised in the same manner as described above, and the holding bar 38 and the return bar members 114a and 114b are displaced upward. . Thereby, the reference outer member 12 is released.

  Next, the outer member whose offset amount is unknown is positioned and fixed to the dimension measuring device 30 in the same procedure as described above, and the measuring element 42 is brought into contact with the inner wall of the tubular portion 20 of the outer member (see FIG. 4). ). As the measuring element 42 is displaced, the measuring core 106 of the micro gauge 46 is displaced, and finally, the pointer is displaced.

  If the offset amount of the outer member matches the offset amount of the reference outer member 12 measured as described above, the pointer becomes the origin. Of course, the pointer indicates a negative value if it is smaller than the reference offset amount, and indicates a positive value if it is large. If these minus width and plus width are within an allowable range corresponding to the tolerance range of the offset amount, the outer member is transported to the next process as satisfying a predetermined dimensional accuracy. On the other hand, the outer member having a large minus width and plus width is excluded at this point as not satisfying the dimensional accuracy because the offset amount exceeds the tolerance.

  In this way, the reference outer member 12 having an offset amount of a predetermined value is positioned and fixed at the position where the balls 40a to 40c are located at the same position as the rolling ball 16 to obtain the origin (measurement reference). Whether or not the offset amount of the outer member to be measured is within the tolerance range can be easily determined by one simple measurement.

  As described above, in the present embodiment, the reference outer member 12 is positioned and fixed at the position where the rolling ball 16 stops, and the measuring element 42 is brought into contact with the inner wall of the reference outer member 12 to cope with the offset amount. First, the displacement amount of the measuring element 42 to be obtained is obtained, and then, this displacement amount is compared with the displacement amount at the other outer member to determine whether or not the offset amount of the outer member is within the tolerance range. I am doing so. Therefore, according to the present embodiment, it is possible to easily measure the offset amount by one simple measurement, and this provides the advantage that the measurement efficiency can be improved.

  In the above-described embodiment, the measuring element 42 is displaced by rotating the rotating member 62. However, the measuring element 42 can be moved closer to and away from the inner wall of the outer member 12. Any displacement mechanism may be used.

  Further, as will be understood from the description of the measurement method of the reference outer member 12, the offset amount may be directly read from the scale of the micro gauge 46.

  Furthermore, the measurement target of the offset amount is not limited to the outer member of the bar field type constant velocity joint, and may be the outer member of a double offset type constant velocity joint (DOJ), for example.

It is a general | schematic whole perspective view of the dimension measuring apparatus for constant velocity joints which concerns on this Embodiment. It is a principal part longitudinal cross-sectional view in the dimension measuring apparatus for constant velocity joints of FIG. FIG. 2 is a vertical cross-sectional view of a main part showing a state in which the lever is rotated and the probe is displaced toward the inner wall of the cylindrical portion in the constant velocity joint dimension measuring apparatus of FIG. 1. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. It is a schematic sectional drawing of a barfield type constant velocity joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Barfield type constant velocity joint 12 ... Outer member 16 ... Rolling ball 18 ... Shaft part 20 ... Cylindrical part 22a-22f ... Ball groove 26a-26f ... Inner side ball groove 30 ... Dimension measuring apparatus 32 for constant velocity joints ... Base 34 ... Supporting part 38 ... Holding rod 40a-40c ... Ball 42 ... Measuring element 44 ... Displacement mechanism 46 ... Micro gauge 60 ... Pressing pin 62 ... Rotating member 66 ... Vertical part 68 ... Step part 84 ... Lever 90 ... Rotating pressing member 92 ... groove 106 ... measuring core 114a, 114b ... return rod member 126 ... handle lever 130 ... gripping member 136 ... recess

Claims (4)

A constant-velocity joint dimension measuring method for measuring a distance from the center of the spherical inner surface of the outer member of the constant-velocity joint to the center of the ball groove,
The outer member that serves as a measurement reference in which the distance from the center of the spherical inner surface to the center of the ball groove is measured in advance is supported, and several of the ball grooves provided on the inner wall of the open cylindrical portion of the outer member are provided. Insert each ball,
Protruding a measuring element arranged between the balls and bringing it into contact with the inner wall of the cylindrical part, the amount of displacement of the measuring element up to the contact as a reference displacement amount,
While supporting the outer member to be measured, insert the balls into several balls in the ball groove provided on the inner wall of the cylindrical portion of the outer member,
The probe is protruded and brought into contact with the inner wall of the cylindrical part,
A method for measuring a dimension of a constant velocity joint, comprising calculating a difference between a displacement amount of the measuring element reaching the contact and the reference displacement amount.   2. The measuring method according to claim 1, wherein when the difference between the displacement amount of the probe and the reference displacement amount is within a preset range, the dimensional accuracy of the outer member is determined to be within an allowable range. A method for measuring the dimensions of a constant velocity joint. A constant velocity joint dimension measuring device for measuring the distance from the center of the spherical inner surface of the outer member of the constant velocity joint to the center of the ball groove,
The base,
A support portion that is erected on the base and supports the cylindrical portion that is opened by the outer member;
A holding part that is disposed above the support part and holds the shaft part of the outer member;
A plurality of balls provided in a number smaller than the number of the track grooves, and are individually inserted into a plurality of track grooves provided on the inner wall of the cylindrical portion by being positioned and fixed to the tip of the support portion;
A measuring element disposed between the balls and contacting or separating from the inner wall of the cylindrical portion;
A displacement mechanism for bringing the measuring element into contact with or separating from the inner wall of the cylindrical portion;
A displacement amount display unit for displaying a displacement amount of the measuring element until the contact is reached when the measuring element contacts the inner wall of the cylindrical portion;
A dimension measuring apparatus for a constant velocity joint. 4. The apparatus according to claim 3, wherein the measuring element is configured so that the other end of the rotating member having the measuring element fixed to one end is pressed by the pressing member and rotates. Dimensional measurement for constant velocity joint, characterized in that, while approaching the inner wall, the other end portion of the rotating member is separated from the inner wall of the cylindrical portion as it is released from the pressing force of the pressing member. apparatus.

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