JP5672733B2 - Power transmission chain pin grinding apparatus and grinding method - Google Patents

Description

  The present invention relates to an apparatus and a method for grinding a pin for a power transmission chain.

For example, in a chain type CVT (Continuously Variable Transmission) of an automobile, a chain is used for power transmission. In this chain, unit members having a structure in which thin plates called link plates are stacked are connected endlessly and flexibly through pins.
12 and 13 are a plan view and a perspective view of the pin, respectively. In FIG. 12, both end faces 1a in the longitudinal direction of the pin 1 are portions that come into contact with the CVT conical pulley, and are entirely inclined (about 11 degrees) as shown. In order to reduce edge load, crowning is applied.

In FIG. 13, three directions orthogonal to each other are defined as X, Y, and Z, Z is the length direction of the pin, X is the width direction, and Y is the thickness direction. Each end face 1a is subjected to a double crowning process having a curvature in two directions intersecting each other, the curvature radius in the XZ plane is R1, and the curvature radius in the YZ plane is R2. Further, the center of the end face 1a is the most convex position as seen from the entire end face, that is, the apex P. The distance between the apexes P on both end faces 1a is the length L of the pin 1 (FIG. 12).
Finishing the crowning exactly as designed is important for maintaining the performance and durability of the CVT, and the position of the apex P and the pin length L are important items that should be finished with high accuracy.

  FIG. 14 is a view showing the main part of the apparatus for grinding the pin 1 so as to have the end face shape as described above, and (a) is a front view showing the pin 1, the carrier 102 holding the pin 1, and the grindstone 103. , (B) is a horizontal sectional view including the center line CL1 in (a) (see, for example, Patent Document 1). The X, Y, and Z3 directions in the figure correspond to the three directions in FIG. 13, and normally, X and Z are the horizontal direction and Y is the vertical direction. The center axis 102z of the carrier 102 and the center axis 103z of the grindstone 103 are on the same center line CL1 in the X direction. The carrier 102 is provided with pockets 102a at equal intervals in the circumferential direction, and the pins 1 are mounted using a jig (not shown). The pin 1 mounted in the pocket 102a of the carrier 102 is supported in parallel with the Z direction with both end surfaces protruding from the carrier 102.

  On the other hand, in the vicinity of the outer periphery of the grindstone 103, a circumferential groove 103a cut inward from the outer peripheral surface is formed so that the cross-sectional shape is a trapezoid as shown. Both side walls in the axial direction (Z, −Z direction) of the circumferential groove 103a are conical surface inclined grinding surfaces 103b, which are symmetrical to each other in the Z direction. In (b), the portion of the grinding surface 103b that grinds the pin 1 is finished so that the radius of curvature is R1. This R1 corresponds to the radius of curvature R1 of the pin 1 at the finish of grinding. Further, the radius of rotation from the center axis 102z of the carrier 102 to the center of the pin 1 is R2 '. The radius of curvature R2 of the pin 1 at the time of grinding is based on this R2 '.

  Grinding is performed by passing the pin 1 through the rotation of the carrier 102 between the pair of grinding surfaces 103b while the grinding wheel 103 is rotating at a constant speed. At this time, the carrier 102 rotates at a low speed when the pin 1 that is next inserted between the abrasive surfaces 103b is in a rotation range that is actually ground by the abrasive surface 103b, and rotates at a high speed otherwise. In the rotation range, both ends 1a of the pin 1 are ground simultaneously by the rotating abrasive surface 103b.

Pamphlet of International Publication Number WO2006 / 043605A1

  In the conventional grinding apparatus as described above, the curvature radius R <b> 2 depends on the rotation radius of the carrier 102. On the other hand, the carrier 102 requires a certain large radius due to the structure in which the pockets 102a for holding the pins 1 are arranged in the circumferential direction. Therefore, there is a limit to reducing the diameter of R2. Although there are other well-known grinding methods, there is no method that can grind both end faces of the pin at the same time and cope with the R2 diameter reduction. In addition, there is a method of forming R2 with the grindstone shape of the grindstone itself, but it is difficult to accurately cope with the grindstone shape.

  In view of such a conventional problem, an object of the present invention is to provide a power transmission chain pin grinding apparatus and grinding method that can easily achieve a smaller radius of curvature.

(1) A power transmission chain pin grinding apparatus according to the present invention is a rotating body that rotates around a central axis, and a pair of grinding members for grinding both end faces of a power transmission chain pin that is a member to be ground in the vicinity of the outer periphery. A grindstone having a grinding surface, a carrier that holds the pin in a posture parallel to the central axis, and is inserted between the pair of grinding surfaces, and is first parallel to the central axis up to the deepest position on grinding by the carrier. A swing mechanism that swings the carrier relative to the grindstone so that the pin is inserted in a proper posture and then the pin swings on a virtual plane orthogonal to the radial direction of the grindstone. It is characterized by comprising.

  In the power transmission chain pin grinding apparatus configured as described above, the first crowning depending on the shape of the grinding surface can be formed by inserting the pin between the pair of grinding surfaces of the rotating grinding wheel portion. it can. The swinging also forms a second crowning in a direction that intersects the first crowning. The radius of curvature of the second crowning does not depend on the carrier, but is determined by the distance between the grinding surface to be ground and the oscillation center axis.

(2) In the grinding apparatus of (1), the swing mechanism may swing the pin from a state where both end surfaces of the pin are in contact with the pair of grinding surfaces at the deepest position.
In this case, the second crowning is formed on both end faces of the pin by swinging. Note that the distance between the grinding surface to be ground and the oscillation center axis corresponds to ½ of the length of the pin.

(3) In the grinding apparatus of (2), the swing mechanism may swing the pin at least once.
Thereby, the whole surface of the both end surfaces of a pin can be ground reliably.

(4) In the grinding apparatus according to (1), the distance between the grinding surfaces during grinding of the pins in a direction parallel to the central axis of the grindstone is longer than the length of the pins, and one end surface of the pin at the deepest position. Is in contact with one of the pair of grinding surfaces, and the other end surface of the pin is not in contact with the other of the pair of grinding surfaces, the swing mechanism swings the pin, and the center of the swing The structure that the axis | shaft is eccentric to either one end surface side may be sufficient.
In this case, the distance between the grinding surface to be ground and the oscillation center axis is not limited to ½ of the length of the pin, and can be made larger or smaller than ½. Therefore, the radius of curvature of the second crowning can be set more freely.

(5) On the other hand, the power transmission chain pin grinding method of the present invention is a rotating body that rotates around a central axis, and grinds both end faces of a power transmission chain pin that is a member to be ground in the vicinity of the outer periphery. A pin for a power transmission chain that is performed using a grinding device that includes a grinding wheel portion having a pair of grinding surfaces and a carrier that holds the pin in a posture parallel to the central axis and is inserted between the pair of grinding surfaces. in the grinding process, (a) the grinding wheel portion is rotated, (b) first inserting the pin in a position parallel to the central axis to the deepest position on the grinding by the carrier, (c) then the pin the grindstone The carrier is swung relative to the grindstone portion so as to swing on a virtual plane orthogonal to the radial direction of the portion.

  In the power transmission chain pin grinding method as described above, the first crowning depending on the shape of the grinding surface can be formed by inserting the pin between the pair of grinding surfaces of the rotating grinding wheel portion. The swinging also forms a second crowning in a direction that intersects the first crowning. The radius of curvature of the second crowning does not depend on the carrier, but is determined by the distance between the grinding surface to be ground and the oscillation center axis.

  According to the grinding device / grinding method for a power transmission chain pin of the present invention, a small radius of curvature that is difficult depending on the carrier can be easily realized.

It is a figure which shows the positional relationship of the grindstone part and pin at the time of grinding in the grinding device of the pin for power transmission chains which concerns on 1st Embodiment of this invention. (A) is the figure which expanded a part of (b) of FIG. 1, and changed direction. (B) is the BB sectional view taken on the line in (a). FIG. 3 is a partially enlarged view of (b) of FIG. It is a front view which shows the 1st example of the whole structure of a grinding device. (A) is the elements on larger scale of the carrier and grindstone in FIG. (B) is a horizontal sectional view including the center line in (a). It is the schematic which shows the structure of the rocking | fluctuation mechanism as an example. It is a front view which shows the 2nd example of the whole structure of a grinding device. It is a front view which shows the 3rd example of the whole structure of a grinding device. (A) is the elements on larger scale of the carrier and grindstone in FIG. (B) is a horizontal sectional view of the principal part including the center line in (a). It is the perspective view which expanded and showed the pin holding | maintenance part. It is sectional drawing which shows the principal part of the grinding device which concerns on 2nd Embodiment, and is sectional drawing corresponding to (b) of FIG. 5 in 1st Embodiment. It is a top view of a pin. It is a perspective view of a pin. It is a figure which shows the principal part of the conventional grinding apparatus, (a) is a front view which shows a pin, the carrier holding this, and a grindstone, (b) is a horizontal sectional view containing the centerline in (a). .

[First Embodiment]
A power transmission chain pin grinding apparatus (grinding method) according to a first embodiment of the present invention will be described below with reference to the drawings. In addition, about the form of the pin 1 which is going to be manufactured by grinding, it is as having already shown in FIG.12 and FIG.13, and abbreviate | omits description here.

《Whetstone and pin》
FIG. 1 is a diagram showing a positional relationship between a grindstone and a pin during grinding. In other words, this is a diagram showing how to grind the pin 1 and the method for holding and driving the pin 1 is not shown. (A) of a figure is a front view which shows the pin 1 and the grindstone 3, (b) is a horizontal sectional view containing the centerline CL1 in (a). The X, Y, and Z3 directions in the figure correspond to the three directions in FIG. 13, and normally, X and Z are the horizontal direction and Y is the vertical direction. The grindstone 3 is a disk-shaped rotating body as a whole, and rotates at a constant speed, for example, counterclockwise about the central axis 3z in the Z direction.

  On the other hand, in the vicinity of the outer periphery of the grindstone 3, a V-groove-shaped peripheral groove 3a cut inward from the outer peripheral surface is formed so that the cross-sectional shape becomes a trapezoid as shown in the figure. Both side walls in the axial direction (Z, −Z direction) of the circumferential groove 3a are conical surface inclined grinding surfaces 3b, which are symmetrical to each other in the Z direction. In (b), the portion of the grinding surface 3b that grinds the pin 1 is finished so that the radius of curvature is R1. This R1 corresponds to the radius of curvature R1 of the pin 1 at the finish of grinding.

The pin 1 has a posture in which the thickness is in the Y direction, the length is in the Z direction, and the width is in the X direction, and the center line in the thickness direction is on the center line CL1 of the grindstone 3 in the X direction (horizontal direction). It is in. Further, the position of the pin 1 in the X, Y, Z space is the deepest position in grinding and is not inserted deeper in the X direction with respect to the circumferential groove 3a.
In the process, the pin 1 inserted into the deepest position as described above and then passing through the deepest position is ground at the same time by the pair of grinding surfaces 3b. As a result, the curvature of the grinding surface 3b is transferred, and an outwardly convex curved surface with a curvature radius R1 is formed on the end surface 1a of the pin 1. That is, such grinding contributes to giving the end surface 1a a one-dimensional curvature.

  FIG. 2A is a partially enlarged view of FIG. (B) is the BB sectional drawing in (a) (however, it is a figure which shows only the end surface shape of a cross section in slice shape). Next, the pin 1 indicated by the solid line in (b) is swung as indicated by the two-dot chain line about the swing center axis Q of the pin 1 viewed in the YZ plane. This swing is a swing on a YZ virtual plane perpendicular to the radial direction of the grindstone 3 when viewed from the grindstone side. Specifically, for example, the position is first swung from the position of the solid line to the position of one of the two-dot chain lines, and then swung in the reverse direction to the position of the other two-dot chain line, and finally the position of the original solid line It is only necessary to perform one reciprocal operation of returning to the initial position. Thus, by swinging the pin 1 at least once in a reciprocating manner, the entire surface of both end faces 1a of the pin 1 can be reliably ground.

  FIG. 3 is a partially enlarged view of FIG. 2B, in which the pin 1 that has been swung is shown by a solid line. In FIG. 3A, the distance from the rocking central axis Q of the pin 1 to the grinding surface 3b as viewed in the YZ plane is R2. In (a), the pin 1 swings clockwise by an angle θ, whereby the lower half 1a1 of the end face 1a is ground in the process. Further, in (b), since the pin 1 has once returned to the initial position (two-dot chain line), the pin 1 swings counterclockwise by an angle θ, and in this process, the upper half 1a2 of the end face 1a is ground. The Thus, the end face 1a is ground so as to have the curvature radius R2 by swinging within the range of 2θ. Note that the angle θ may be set up to a point where the end face 1a is ground completely. The curvature radius R2 corresponds to the curvature radius R2 (FIG. 13) of the pin 1 at the time of grinding finish.

Next, the overall configuration of a grinding apparatus including an apparatus that holds and drives the pin 1 will be described.
<< Overall configuration: first example >>
FIG. 4 is a front view showing a first example of the overall configuration of the grinding apparatus 100.
In FIG. 4, the horizontal (horizontal), vertical, and depth directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction, as shown. These directions correspond to the directions in FIGS. The grinding apparatus 100 includes a base 4, a grindstone support 5 attached to the base 4 so as to be movable in parallel with the X direction, and a grindstone supported by the grindstone support 5 so as to be rotatable about a central axis 3z. 3, a dresser support base 6, 7 attached to the grindstone support base 5 so as to be movable parallel to the X direction and the Y direction, respectively, and a dresser 8 supported by the dresser support base 6, 7. .

The grinding device 100 is supported by the carrier support base 9 attached to the base 4, the swing mechanism 10 attached to the carrier support base 9, the swing mechanism 10 so as to be swingable as described above, and , And a disk-shaped carrier 2 supported rotatably around a central axis 2z parallel to the Z direction.
Note that there is a grinding apparatus that does not include the dresser support base 7 for moving in the vertical direction (Y direction). In this case, the dresser 8 is disposed on the center line CL1 of the carrier 2 and the grindstone 3.

The carrier 2 and the grindstone 3 are each driven to rotate counterclockwise by a motor (not shown). The carrier 2 can be rotated at two stages (high speed and low speed) and can be stopped every time the pin is inserted into the deepest position.
The dresser 8 is also driven to rotate by a motor (not shown). The grindstone 3 can be formed into a desired shape by bringing the dresser 8 into contact with the grindstone 3 by the dresser support bases 6 and 7 while rotating the grindstone 3 and the dresser 8.

(A) of FIG. 5 is the elements on larger scale of the carrier 2 and the grindstone 3 in FIG. The center axis 2z of the carrier 2 and the center axis 3z of the grindstone 3 are on the same center line CL1 in the X direction. (B) is a horizontal sectional view including the center line CL1 in (a). The carrier 2 is provided with pockets 2a at equal intervals in the circumferential direction, and the pins 1 are mounted using a jig (not shown). The pins 1 mounted in the pockets 2a of the carrier 2 are supported in parallel with the Z direction with both end surfaces protruding from the carrier 2.
The configuration of the grindstone 3 is the same as that shown in FIG.

  Grinding is performed by passing the pin 1 between the pair of grinding surfaces 3b by the rotation of the carrier 2 while the grinding wheel 3 is rotating at a constant speed. At this time, the carrier 2 rotates at a low speed when the pin 1 to be next inserted between the abrasive surfaces 3b is in a rotation range that is actually ground by the abrasive surface 3b, and rotates at a high speed otherwise. In the rotation range, both end surfaces 1a of the pin 1 are ground simultaneously by the rotating abrasive surface 3b. By this grinding, a radius of curvature R1 is formed on both end faces 1a.

  Further, in the above rotation range, when the pin 1 becomes horizontal, that is, when it is at the deepest position, the rotation of the carrier 2 is temporarily stopped. Here, the swing mechanism 10 (FIG. 4) operates. The swing mechanism 10 swings the carrier 2 around a swing center axis Q (FIG. 5B) passing through the center (center of gravity) of the carrier 2 and parallel to the X direction. The center (center of gravity) of the pin 1 located at the deepest position between the pair of grinding surfaces 3b is also on the oscillation center axis Q, and thus the oscillation shown in FIG. 2 is possible. Since the details of the swing are as described above, the description is omitted here. By this grinding, a radius of curvature R2 is formed on both end faces 1a.

Thus, in said grinding apparatus 100, the 1st crowning of the curvature radius R1 based on a grinding | polishing surface shape can be formed by inserting the pin 1 in the deepest position between a pair of grinding | polishing surfaces 3b. Further, the second crowning in the direction intersecting with the first crowning is also formed by the swing. The radius of curvature R2 of the second crowning does not depend on the carrier 2, but is determined by the distance between the grinding surface to be ground and the oscillation center axis. This distance corresponds to ½ of the length of the pin 1. Therefore, even a small radius of curvature R2, which is difficult depending on the carrier 2, can be easily realized. For example, R2 which can only be about 40 mm as R2 in the conventional grinding apparatus shown in FIG. 14 can be easily realized as 12 mm according to the grinding apparatus 100, and can be further reduced.
In addition, since both end faces 1a are ground at a time without changing the pin 1, no error occurs due to the changing, so that the grinding accuracy is excellent.

  The swing mechanism 10 can be variously and easily configured using various cams and link mechanisms. It is also possible to use an electric mechanism that rotates the rocking shaft in the forward and reverse directions within the aforementioned 2θ range using a servo motor, a pulse motor, or the like.

  FIG. 6 is a schematic diagram illustrating a configuration of the swing mechanism 10 as an example. The shaft 2b of the carrier 2 is driven by a motor (not shown), and this shaft 2b is supported by two vertical support members 11. The support member 11 rotatably supports the shaft 2b and supports the shaft 2b so as to be movable in the vertical direction. The lower end of the support member 11 is in contact with the swash plate cam 12 so as to be slidable or rollable. The swash plate cam 12 is rotated by the rotation of the drive shaft 12a. When the swash plate cam 12 rotates, the support member 11 moves up and down. The pair of support members 11 are phase-shifted by 180 degrees with respect to the swash plate cam 12. Therefore, by rotating the swash plate cam 12, as shown in FIGS. 2 can be swung. In addition, except at the time of rocking | fluctuation, it shall stop at the neutral position shown in (c) and shall maintain the state of the rocking | swiveling angle 0.

  In addition, according to the structure of the said grindstone 3, since both the grinding | polishing surfaces 3b belong to one grindstone 3, it is easy to ensure the dimensional accuracy of the circumferential groove 3a, Therefore, it is easy to ensure the precision of grinding of the pin 1. It is. However, for example, a pair of grindstones 3 having the same shape having a grinding surface 3b is prepared, and the grinding surfaces 3b are combined so as to face each other with a predetermined interval, and the whole is substantially as shown in FIG. You may comprise the "grinding wheel part" of a form as shown. Further, it may be a “grindstone portion” having a three-layer structure in which a base material other than a grindstone is sandwiched between them.

<< Overall configuration: second example >>
FIG. 7 is a front view showing a second example of the overall configuration of the grinding apparatus 100.
The second example is the same as the first example except for the carrier configuration. That is, in the first example of the overall configuration, the carrier 2 is configured to rotate while holding the pin 1, but in the second example, as shown in FIG. 7, a conveyor type that vertically conveys between the upper and lower pulleys 13. The carrier 14 is provided. The pins are attached to the carrier 14 so as to be parallel to the Z direction, and are guided between the pair of grinding surfaces while moving vertically by the rotation of the pulley 13. Also in this case, the carrier 14 is stopped at the deepest position, and the swing mechanism 10 swings the pins together with the carrier 14. A first crowning is formed by reaching and passing through the deepest position, and a second crowning is formed by swinging.

<< Overall configuration: third example >>
FIG. 8 is a front view showing a third example of the overall configuration of the grinding apparatus 100.
The third example is the same as the first example except for the carrier configuration. That is, the carrier 2 in the third example has a shape in which notches are formed at equal intervals on the outer peripheral surface of the disk-shaped member, and can be rotated around the central axis 2z parallel to the Z direction by the carrier support base 9. It is supported. The carrier 2 is supported by the swing mechanism 10 so as to be swingable.

FIG. 9A is a partially enlarged view of the carrier 2 and the grindstone 3 in FIG. The center axis 2z of the carrier 2 and the center axis 3z of the grindstone 3 are on the same center line CL1 in the X direction. FIG. 9B is a horizontal cross-sectional view of the main part including the center line CL1 in FIG. The carrier 2 is provided with pin holding portions 20 formed by notching the circumferential surface at, for example, eight locations at equal intervals in the circumferential direction, and the pins 1 are held. The pin 1 held by the pin holding part 20 is held in parallel with the Z direction (center axis 3z) in a state in which both end faces protrude from the carrier 2.
In addition, about the structure of the grindstone 3, since it is the same as that of a 1st example, description is abbreviate | omitted.

  FIG. 10 is an enlarged perspective view of the pin holding unit 20. The pin holding portion 20 is fixed to a pin holding surface 21 formed along the radial line of the carrier 2 and parallel to the central axis 2z, and a step surface 22 provided with a step with respect to the pin holding surface 21. And a plate-like pressing member 23. The pin 1 is positioned by contacting the lower surface and the side surface thereof with a pin holding surface 21 and a step portion 22 a that connects the pin holding surface 21 and the step surface 22. Further, the pin 1 is sandwiched between the pin holding surface 21 and the pressing member 23 and is held parallel to the Z direction with both end surfaces protruding from the carrier 2 as described above.

  The holding member 23 is, for example, a leaf spring formed of spring steel in the shape shown in the figure, and one end portion thereof is fixed to the step surface 22 by a bolt 26 while being clamped by shims 24 and 25 to the vicinity of the center portion. The end portion side protrudes from the step surface 22 to form a protruding portion 23a. The protruding portion 23a faces the pin holding surface 21 with a dimension slightly smaller than the thickness dimension of the pin 1 in a state where the pin 1 is not sandwiched. The protruding portion 23a, which is a leaf spring, can be moderately elastically deformed, and the pin 1 can be appropriately held by the elastic force generated by the elastic deformation generated when the pin 1 is held.

  In addition, a recess 27 is formed between the pair of pin holding surfaces 21. Therefore, the lower surface (XZ surface) of the pin 1 is in contact with the pin holding surface 21 only at two locations near both ends thereof. ing. In this case, since the pin 1 is held at two locations that are separated from each other in the Z direction, the posture is stabilized and the occurrence of rattling of the pin 1 in the holding state can be minimized. Further, since the contact area between the pin holding surface 21 and the pin 1 is reduced, the resistance when the pin 1 is attached / detached can be reduced, and the attachment / detachment becomes easier.

In the grinding apparatus 100 of the second example configured as described above, grinding is performed in the same manner as in the first example, and first and second crownings are formed.
Further, since the held pin 1 is held in contact with the pin holding surface 21 facing the grinding direction of the abrasive surface 3b, most of the grinding resistance acting on the pin 1 with the grinding of the both end surfaces 1a is pin-held. It can be received by the surface 21. This is the same when swinging. Therefore, the pin 1 can be held with a relatively simple structure of being pinched by the pin holding surface 21 and the elastically deformable pressing member 23 without being held firmly, and the pin 1 can be held without complicated procedures. Detachable.

  In the third example, a leaf spring is used as the pressing member 23. However, any material can be used as long as it can be elastically deformed and can detachably hold the pin 1. For example, a resin or the like can be used. The shape of the pressing member 23 is not limited to a plate shape as long as the pin 1 can be detachably clamped.

[Second Embodiment]
Next, a power transmission chain pin grinding apparatus according to a second embodiment of the present invention will be described. This grinding apparatus has a configuration similar to the first example of the overall configuration in the first embodiment, but there is a difference in the basic configuration.
FIG. 11 is a cross-sectional view corresponding to FIG. 5B in the first embodiment. In FIG. 11, the grindstone 3 has a configuration in which the distance between the grinding surfaces 3b is variable. In the state shown in the figure, the pin 1 is at the deepest position, but the end face 1a is in contact with only one of the pair of grinding surfaces 3b and is not in contact with the other. The center axis Q of the swing of the carrier 2 and the pin 1 is not in the middle in the Z direction, but is eccentric to the upper side in the Z direction on the drawing sheet.

In such a configuration, the radius of curvature R2 formed by the swing is R2> (L / 2) with respect to the length L of the pin 1. On the contrary, when the oscillation center axis Q is decentered downward in the Z direction on the paper surface, R2 <(L / 2).
That is, in such a configuration, the distance between the grinding surface to be ground and the oscillation center axis Q is not limited to ½ of the length L of the pin 1, and can be made larger or smaller than ½. Is also possible. Therefore, the radius of curvature R2 of the second crowning can be set more freely. However, the radius of curvature R2 cannot be formed on both end faces 1a at the same time.

[Others]
In each of the above embodiments, the pin 1 is swung together with the carrier 2 (or 14). However, the second crowning can be formed by rocking the grindstone 3 instead of the carrier. . In short, it is only necessary that the carrier 2 can be swung relative to the grindstone 3.

  In addition, it is preferable in terms of grinding efficiency to use the carrier 2 (or 14) that holds the plurality of pins 1 as in the overall configuration example in the first embodiment, but basically, in the circumferential groove 3a of the grindstone 3 On the other hand, a simple carrier may be used in which the pins 1 are taken in and out in the radial direction and rocked at the deepest position. In this case, the machining is completed by cutting to the deepest position at the workpiece angle shown in FIG. 3A and swinging to the position shown in FIG. Therefore, the restriction that the number of swings is at least one reciprocation is eliminated.

  In the overall configuration example of the first embodiment, the carrier is stopped for swinging. However, the carrier may be swung for a predetermined time before and after the deepest position while moving at a low speed. . In this case, it is necessary to adjust the relationship between the feed speed and the rocking speed so that the grinding by rocking extends over the entire end surface 1 a of the pin 1.

1: pin (pin for power transmission chain), 1a: end face, 2: carrier, 3: grinding wheel (grinding wheel part), 3z: central axis, 3b: grinding surface, 10: swing mechanism, 14: carrier

Claims (5)

A rotating body that rotates around a central axis, and a grindstone having a pair of grinding surfaces for grinding both end faces of a power transmission chain pin that is a member to be ground, in the vicinity of the outer periphery;
A carrier for holding the pin in a posture parallel to the central axis and inserting the pin between the pair of grinding surfaces;
First, the grindstone part is inserted so that the pin is inserted in a posture parallel to the central axis to the deepest position on grinding by the carrier, and then the pin swings on a virtual plane perpendicular to the radial direction of the grindstone part. And a rocking mechanism for relatively rocking the carrier with respect to the power transmission chain pin grinding apparatus.   2. The power transmission chain pin grinding apparatus according to claim 1, wherein the swing mechanism swings the pin from a state in which both end surfaces of the pin are in contact with the pair of grinding surfaces at the deepest position. 3.   The power transmission chain pin grinding apparatus according to claim 2, wherein the swing mechanism swings the pin at least once. In the direction parallel to the central axis of the grindstone, the distance between the grinding surfaces during grinding of the pins is longer than the length of the pins,
The swing mechanism swings the pin from a state where one end surface of the pin is in contact with one of the pair of grinding surfaces at the deepest position and the other end surface of the pin is not in contact with the other of the pair of grinding surfaces. 2. The power transmission chain pin grinding device according to claim 1, wherein the center axis of the oscillation is decentered toward one of the end faces. A rotating body that rotates around a central axis, and has a grindstone portion having a pair of grinding surfaces for grinding both end faces of a power transmission chain pin that is a member to be ground in the vicinity of the outer periphery, and the pin as a central axis. In a grinding method of a pin for a power transmission chain that is performed using a grinding device that includes a carrier that is held in a parallel posture and inserted between the pair of grinding surfaces,
Rotate the grinding wheel,
First , insert the pin in a posture parallel to the central axis to the deepest position on grinding by the carrier,
Next, the carrier is swung relative to the grindstone so that the pin is swung on a virtual plane perpendicular to the radial direction of the grindstone.
A method for grinding a pin for a power transmission chain.

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