JP5545107B2 - 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. FIG. 10 is a perspective view of the pin. In the figure, both end faces 1a in the longitudinal direction of the pin 1 are portions that contact a CVT conical pulley, and are inclined as a whole as shown in the figure, and crowning is performed in two directions in order to reduce edge load. It has been subjected. The shape of the end surface 1a viewed from the direction of arrow A is close to an ellipse.

  In FIG. 10, three directions orthogonal to each other are defined as X, Y, and Z, where 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.

  FIG. 11 is a diagram showing a main part of an apparatus for grinding the pin 1 (for example, see Patent Document 1). FIG. 11A shows a grindstone 103 and a carrier 102 holding a plurality of pins 1. (B) is a sectional view of the grindstone 103. The X, Y, and Z3 directions in the figure correspond to the three directions in FIG. 10, and normally, X and Z are the horizontal direction and Y is the vertical direction. Pins 1 are attached to the carrier 102 at equal intervals in the circumferential direction. The pin 1 attached to the carrier 102 is supported in parallel with the Z direction with both end faces 1a protruding from the carrier 102. The carrier 102 actually has a relatively larger diameter than that shown in the figure, but here, the carrier 102 is drawn assuming a small diameter carrier 102.

  On the other hand, in the vicinity of the outer periphery of the grindstone 103, a circumferential groove 103a having a cross-sectional shape as illustrated is formed. Both side walls in the axial direction (Z, −Z direction) of the circumferential groove 103a are inclined grinding surfaces 103b, which are symmetrical to each other in the Z direction. Further, 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 (FIG. 10) of the pin 1 at the time of grinding finish. 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 (FIG. 10) of the pin 1 at the time of grinding finish 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. Both end surfaces 1a of the pin 1 are ground simultaneously by the rotating abrasive surface 103b.

Pamphlet of International Publication Number WO2006 / 043605A1

  In the conventional power transmission chain pin grinding apparatus as described above, there is a demand for further reducing the radius of curvature R2 of the end surface 1a of the pin 1 for the purpose of further reducing the edge load. In FIG. 11A, the carrier 102 is intentionally represented with a smaller diameter than the actual size image in consideration of this. However, the central axis 102 z that is the rotation center of the carrier 102 is actually a shaft having a predetermined diameter, and the shaft must ensure a certain gap between the outer peripheral end of the grindstone 103. Therefore, there is a limit to reducing R2 'in FIG. If the carrier 102 is too small in diameter, it will be difficult to hold a large number of pins at once, and the efficiency of the entire grinding operation will deteriorate.

  In view of such conventional problems, the present invention provides a pin and a grinding method for a power transmission chain pin that can further reduce the radius of curvature (R2) of the end face of the pin without reducing the diameter of the carrier. ,With the goal.

  (1) The power transmission chain pin grinding device of the present invention is a rotating body that rotates around a first 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 grindstone having a pair of grinding surfaces, and a rotating body that rotates about a second central axis parallel to the first central axis, the pin being held in a posture parallel to the first central axis, The second central axis is relative to the first central axis at the front and back positions of the deepest position where the pin is inserted deeply into the grinding wheel portion and ground, and the carrier inserted between a pair of grinding surfaces and passed therethrough. And a drive mechanism that drives the carrier so as to advance and retreat relatively far away at the deepest position.

  In the power transmission chain pin grinding apparatus configured as described above, the original pin feed radius extends from the second central axis to the center of the end face of the pin. However, the pin feed radius is reduced in a pseudo manner by performing an advancing / retreating operation in which the second central axis is relatively close to the first central axis at the front and rear positions of the deepest position and relatively far away from the deepest position. . Accordingly, the corresponding radius of curvature of the end face of the pin can be further reduced based on the pin feed radius that has become pseudo-small.

(2) Further, in the grinding apparatus of (1) above, the forward / backward movement is synchronized with the rotation of the carrier so that the pin comes to the grinding start position as the front position of the deepest position in a state where the forward movement of the constant displacement amount is made It may be performed as follows.
In this case, since the grinding is started in a state where the pin feed radius is artificially reduced, the radius of curvature of the end surface of the pin can be reliably reduced. Further, since the second central axis is retracted at the deepest position, the vertex grinding on the end face of the pin does not become deep.

(3) Moreover, in the grinding apparatus of said (1), a drive mechanism may produce advancing / retreating operation | movement by comprising a carrier and a cam mechanism.
In this case, a stable and reliable advance / retreat operation can be realized by the cam mechanism.

  (4) On the other hand, the present invention is a rotating body that rotates around the first central axis, and has a pair of grinding surfaces that grind both end faces of a power transmission chain pin that is a member to be ground in the vicinity of the outer periphery. And a rotating body that rotates around a second central axis parallel to the first central axis, the carrier holding the pin in a posture parallel to the first central axis. In the power transmission chain pin grinding method to be performed, when the pin is inserted and passed by the carrier between the pair of grinding surfaces of the rotating grindstone portion, (i) the pin is closest to the grindstone portion. The second central axis is relatively close to the first central axis at the front position of the deepest position to be deeply ground and (ii) the second central axis is relative to the first central axis at the deepest position. (Iii) after the deepest position Wherein the second central axis closer relative to the first central axis, in which the carrier of the forward and backward movement of runs.

  In such a power transmission chain pin grinding method, the original pin feed radius extends from the second central axis to the center of the end face of the pin. However, the steps (i) to (iii) realize the advancing / retreating operation in which the second central axis is relatively close to the first central axis at the front and rear positions of the deepest position and relatively far away from the deepest position. In a pseudo manner, the pin feed radius becomes small. Accordingly, the corresponding radius of curvature of the end face of the pin can be further reduced based on the pin feed radius that has become pseudo-small.

  According to the power transmission chain pin grinding apparatus or grinding method of the present invention, the radius of curvature of the end face of the pin can be further reduced without reducing the diameter of the carrier.

It is a front view which shows the 1st example of the whole structure in the grinding device of the pin for power transmission chains which concerns on one Embodiment of this invention. (A) is the elements on larger scale of the carrier and grindstone in FIG. 1, (b) is a horizontal sectional view containing the centerline in (a). (B) is a cross-sectional view of the carrier and the grindstone similar to (b) of FIG. 2, and (a) is a diagram geometrically showing the forward / backward movement of the center axis of the carrier corresponding to (b). . It is the figure which divided and showed (a) of FIG. 3 with time. It is a figure which shows the example which employ | adopted the cam mechanism as a drive mechanism in the grinding apparatus of FIG. FIG. 6 is a view similar to FIG. 5, but shows a state before or after a half cycle from the state of FIG. 5 when the grinding process for one pin is one cycle. It is a front view which shows the 2nd example of the whole structure of a grinding device. (A) is the elements on larger scale of the carrier and grindstone in FIG. 7, (b) is a horizontal sectional view of the principal part containing the centerline in (a). It is the perspective view which expanded and showed the pin holding | maintenance part in FIG. It is a perspective view of a pin. It is a figure which shows the principal part of the apparatus which grinds a pin with the conventional grinding method, (a) is a partial front view which shows the grindstone and the carrier holding the several pin, (b) is sectional drawing of a grindstone. is there.

  A power transmission chain pin grinding apparatus (grinding method) according to an 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. 10, and description is abbreviate | omitted here.

<< Overall configuration: first example >>
FIG. 1 is a front view showing a first example of the overall configuration of the grinding apparatus 100.
In FIG. 1, 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 also correspond to the respective directions in FIG. 10 of the pin 1 during grinding. 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 apparatus 100 includes a carrier support base 9 attached to the base 4, a drive mechanism 10 attached to the carrier support base 9, and capable of causing the carrier 2 to move forward and backward in the X direction, and the drive mechanism 10 And a disk-shaped carrier 2 that is supported by the carrier support 9 and rotatably supported 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.
In addition, the figure is intended to show the structure in an easy-to-understand manner, and the size of each part shown in the drawing is not necessarily proportional to the actual dimension. The same applies to FIGS. 2 to 9 described later.

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, for example, two stages (high speed and low speed) and is rotated at a low speed during grinding.
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.

  FIG. 2A 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. (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. Note that the numbers of the pockets 2a and the pins 1 are merely examples, and may be provided more densely.

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 circumferential groove 3a cut inward from the outer peripheral surface is formed so that the cross-sectional shape is as shown in the figure. Both side walls in the axial direction (Z, -Z direction) near the outer peripheral side of the circumferential groove 3a are inclined (conical surface-like when viewed from the entire circumference) abrasive surfaces 3b, which are mutually in the Z direction. Oppositely symmetrical. 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.

  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 FIG. 2A, the pin 1 at the time of grinding at the “3 o'clock” position of the carrier 2 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. The direction center line is on the center line CL1 of the grindstone 3 in the X direction (horizontal direction). Both end surfaces 1a of the pin 1 are ground simultaneously by the pair of grinding surfaces 3b. Thereby, it grinds with the curvature of the grinding | polishing surface 3b, and the curved surface of curvature radius R1 of convex shape is formed in the end surface 1a of the pin 1 outside.

  On the other hand, in synchronization with the pin 1 entering the rotation range ground by the grindstone 3, the center axis 2z of the carrier 2 performs an advance / retreat operation with a constant displacement amount in the X direction. Specifically, the position of the pin 1 at 3 o'clock in FIG. 2A in which the pin 1 penetrates deeply into the grindstone 3 and is ground is the deepest position, and among the front and rear positions of the deepest position, the pin 1 If the position at which the grinding of the end face 1a is started is defined as the front position, and the position opposite to the front position with the deepest position interposed therebetween is defined as the rear position, the following forward / backward movement is performed.

  That is, (i) First, the central axis 2z of the carrier 2 is brought closer to the central axis 3z of the grindstone 3 at the front position of the deepest position. (Ii) Next, the central axis 2z of the carrier 2 is moved to the central axis of the grindstone 3 at the deepest position. And (iii) the central axis 2z of the carrier 2 is brought close to the central axis 3z of the grindstone 3 at the rearmost position of the deepest position.

<Relationship between center axis displacement of carrier and grinding>
3 (b) is a cross-sectional view of the carrier 2 and the grindstone 3 similar to FIG. 2 (b), and FIG. 3 (a) corresponds to FIG. FIG. In FIG. 3A, three ellipses conceptually show the end face 1 a of the pin 1. A center ellipse with a diagonal line represents the pin 1 at the deepest position in relation to the grinding surface 3b. As described above, since the carrier 2 shown in FIG. 1 or 2 rotates in the counterclockwise direction, the pin 1 to be ground passes from the lower side to the upper side in FIG. 3A. Therefore, the lower ellipse is a front position from the deepest position at the time of grinding, and is a grinding start position. The upper ellipse is a position opposite to the front position across the deepest position, that is, the rear position.

  Rg in the figure represents the length from the center axis 3z of the grindstone 3 to the center P of the end surface 1a of the pin 1 at the deepest position (substantially the same as the vertex P in FIG. 10). r0 represents the length from the center axis 2z of the carrier 2 to the center P of the end face 1a of the pin 1 at the deepest position, that is, the pin feed radius. C represents the position when the central axis 2z is advanced by the displacement amount Δx. An arc Aq indicates a locus of movement of the point Q (fixed point) on the carrier 2, and its radius is (rg + r2). r2 is a desired pin feed radius to be obtained in a pseudo manner. Further, as shown in the figure, the angles θ and φ are defined.

<Calculation method of displacement>
Here, in FIG. 3A, a relational expression regarding the displacement amount Δx of the center axis 2z of the carrier 2 is derived. Assuming that the original position of the central axis 2z is the origin, the coordinates (xq, yq) of the point Q are expressed as follows.
xq = r0 + rg− (rg + r2) cos (φ−θ). . . (1)
yq = (rg + r2) sin (φ−θ)
= (R0-r2) sinθ. . . (2)
When θ is obtained from the equations (1) and (2),
θ = arctan [(rg + r2) sinφ / {r0−r2 + (rg + r2) cosφ}]. . . (3)
It becomes.

Further, the coordinates (xc, yc) of the point C are (Δx, 0). The line segment CQ is
CQ = r0−r2. . . (4)
Using that is
Δx = [(r0−r2) ² − {(rg + r2) sin θ} ² ] ^1/2 + {r0 + rg− (rg + r2) cos (φ−θ)}. . . (5)
It becomes.

  In the above formula (5), r0 and rg are structurally determined values. Further, θ can be obtained from the position at which grinding starts. φ depends on θ. Therefore, the above equation (5) is an equation indicating the displacement amount Δx necessary to obtain the desired r2. Conversely, if the displacement amount Δx is determined, r2 is also determined.

《Displacement timing》
FIG. 4 is a diagram showing (a) of FIG. 3 divided over time. That is, FIG. 4A shows when the pin 1 is at the front position, FIG. 4B shows when the pin 1 is at the deepest position, and FIG. 4C shows when the pin 1 is at the rear position. In (a), the central axis 2z advances forward by a displacement amount Δx in the X direction when the pin 1 reaches a position before starting grinding (or by that time). Next, until the pin 1 moves from the position (a) to the deepest position shown in (b), the central axis 2z moves backward and returns to the original position. Then, before the pin 1 moves from the position (b) to the rear position shown in (c), the pin 1 moves forward again by the displacement amount Δx. Such a series of movements is regarded as a one-cycle operation for one pin, and the cycle operation is sequentially repeated.

  Here, the trajectory along which the center of the pin 1 moves is on a circle having a radius r2 with the point Q as the center. Accordingly, the pin 1 is the same as rotating at the pin feed radius r2. Strictly speaking, since the position of the point Q is different in (a), (b), and (c), the circles with the radius r2 are not the same, but the angle θ is small, so the pin 1 rotates with the pin feed radius r2. It can be regarded as moving.

  As described above, in the grinding apparatus, the original pin feed radius (r0) is from the center axis 2z of the carrier 2 to the center P of the end face 1a of the pin 1. However, the central axis 2z approaches the central axis 3z of the grindstone 3 at the front and rear positions of the deepest position, and the pin feed radius is reduced from r0 to r2 in a pseudo manner by performing an advancing / retreating operation away from the deepest position. . The pin feed radius r2 substantially coincides with the radius of curvature R2 (FIG. 10) of the end face 1a of the pin 1. Therefore, the radius of curvature R2 of the end face 1a of the pin 1 can be further reduced based on the pin feed radius that is reduced in a pseudo manner. That is, according to this power transmission chain pin grinding device, the radius of curvature R2 of the end face 1a of the pin 1 can be further reduced without reducing the diameter of the carrier 2.

  Further, since the advance / retreat operation is performed in synchronization with the rotation of the carrier 2 so that the pin 1 comes to the grinding start position which is the front position of the deepest position in a state where the advancement is performed by the constant displacement amount Δx, Grinding is started with the pin feed radius being reduced. Therefore, the radius of curvature R2 of the end surface 1a of the pin 1 can be reliably reduced. Further, since the central axis 2z is retracted at the deepest position, the grinding of the apex P (FIG. 10) on the end surface 1a of the pin 1 does not become deep.

Note that the pseudo pin feed radius r2 in the grinding apparatus (grinding method) as described above has no theoretical lower limit value, and can be minimized.
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.

<Example of drive mechanism>
The drive mechanism 10 (FIG. 1) for causing the carrier 2 to advance and retract as described above only needs to be configured to detect the angle of the pin 1 to be ground and to advance and retract the fixed displacement amount based thereon. It can be configured as a control system by a detection sensor, a servo motor for advancing / retreating drive, or the like. Further, a mechanical configuration that generates a reciprocating stroke operation by a link mechanism that interlocks with a certain amount of rotation of the carrier 2 without depending on electrical control may be employed.

  FIG. 5 is a diagram illustrating an example in which a cam mechanism is employed as the drive mechanism 10. In the figure, this carrier 2 holds 18 pins 1. A cam 2c is fixed to a central shaft 2z that rotates integrally with the carrier 2. Smooth irregularities are formed on the outer periphery of the cam 2c, and the depressions are formed at 18 positions corresponding to the pins 1 in terms of angle. The engaging pin 11 is provided separately from the carrier 2 and is engaged with the cam 2c. That is, a cam mechanism is constituted by the cam 2 c on the carrier 2 side and the engagement pin 11. The central shaft 2z is rotationally driven by a motor (not shown) and can move in a predetermined range in the X direction (that is, by the amount of displacement). In the state shown in the figure, the engaging pin 11 is engaged with the recess of the cam 2c. The pin 1 at the 3 o'clock position is at the deepest position for grinding.

  On the other hand, in FIG. 6, the state before the half cycle or after the half cycle when the grinding process for one pin 1 is one cycle is shown by a solid line (the dotted line is the state of FIG. 5). The aforementioned front position may be in the middle from the half cycle before to the deepest position, or may be the position itself before the half cycle. The rear position may be midway from the deepest position to after half a cycle, or may be the position itself after a half cycle. In the state of FIG. 6, the engaging pin 11 rides on the convex portion of the cam 2c. As a result, the entire carrier 2 including the central axis 2z moves by a certain amount in the X direction with respect to the engaging pin 11 which is a fixed point. By securing a value equal to or greater than the above-described displacement amount Δx as this fixed amount, the carrier 2 can make the central axis 2z move back and forth in one reciprocating motion in synchronization with the rotation of its own fixed angle. According to such a cam mechanism, stable and reliable advance / retreat operation can be realized.

<< Overall configuration: second example >>
Hereinafter, another example relating to the overall configuration of the grinding apparatus will be described for reference.
FIG. 7 is a front view showing a second example of the overall configuration of the grinding apparatus 100. The second example is different from the first example in the configuration (shape and pin holding structure) of the carrier 2, but is the same except that the carrier 2 is advanced and retracted.
As shown in the drawing, the carrier 2 in the second example has a shape in which notches are formed at equal intervals on the outer peripheral surface of a disk-shaped member.

(A) of FIG. 8 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. FIG. 8B 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. 9 is an enlarged perspective view of the pin holding portion 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 double crowning (curvature radii R1, R2) is 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. 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 second example, a leaf spring is used for 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.

<Others>
In addition, regarding the above-described advance / retreat operation of the carrier 2 common to each example of the overall configuration described above, for example, the position of the central axis 2z in FIG. However, in a state where the advancing and retreating operations are periodically repeated, which is the original position is merely a setting for convenience. That is, it can also be understood that the position of the point C in FIG. 3A is the original position and the displacement of Δx is caused in the (−x) direction. However, the center axis 2z of the carrier 2 is relatively “closed” or “away from” the center axis 3z of the grindstone 3, or the center axis 2z of the carrier 2 is relatively relative to the center axis 3z of the grindstone 3. The relationship “approaching” or “moving away” is common regardless of the above interpretation.

  In both the first example and the second example of the overall configuration, the grindstone 3 is basically a single member. According to such a configuration, since both the grinding surfaces 3b belong to one grindstone 3, it is easy to ensure the dimensional accuracy of the circumferential groove 3a, and therefore it is easy to ensure the grinding accuracy of the pin 1. However, for example, a pair of grindstones 3 having the same shape having a grinding surface 3b are prepared, and the grinding surfaces 3b are combined so as to face each other with a predetermined interval, and the whole 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.

1: pin (power transmission chain pin), 2: carrier, 2c: cam (cam mechanism), 2z: central axis (second central axis), 3: grinding wheel (grinding wheel part), 3b: grinding surface, 3z: center Axis (first central axis), 10: drive mechanism, 11: engagement pin (cam mechanism), 100: grinding device

Claims (4)

A rotating body that rotates around a first central axis, and a grinding wheel 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;
A rotating body that rotates about a second central axis parallel to the first central axis, the pin being held in a posture parallel to the first central axis, inserted between the pair of grinding surfaces, and passed With a career
The second central axis is relatively close to the first central axis at the front and rear positions of the deepest position where the pin is deeply penetrated into the grindstone portion and is ground, and is relatively far away at the deepest position. And a drive mechanism for driving the carrier so as to move forward and backward.   2. The power according to claim 1, wherein the advance / retreat operation is performed in synchronization with the rotation of the carrier so that the pin comes to a grinding start position as a front position of the deepest position in a state where the head is advanced by a predetermined amount of displacement. Transmission chain pin grinding device.   2. The power transmission chain pin grinding device according to claim 1, wherein the drive mechanism forms the advance and retreat operation by constituting the carrier and a cam mechanism. A rotating body that rotates around a first central axis, and a grinding wheel portion having a pair of grinding surfaces that grind both end faces of a power transmission chain pin, which is a member to be ground, in the vicinity of the outer periphery; and the first central axis; A power transmission chain pin grinding method using a grinding device having a rotating body rotating around a parallel second central axis and holding the pin in a posture parallel to the first central axis In
When the pin is inserted and passed by the carrier between the pair of grinding surfaces of the rotating grindstone part,
The second central axis is relatively close to the first central axis at the front position of the deepest position where the pin penetrates deeply into the grinding wheel portion and is ground,
In the deepest position, the second central axis is relatively distant from the first central axis,
The second central axis is relatively close to the first central axis at the rearmost position of the deepest position.
A method of grinding a pin for a power transmission chain, wherein the carrier performs the forward / backward movement.

Images