JP4305060B2 - Valve cotter assembling apparatus and assembling method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve cotter assembling apparatus and an assembling method for assembling a plurality of divided valve cotters for fixing a retainer pressed by a valve spring to a valve stem into a tapered hole of the retainer.
[0002]
[Prior art]
The valve cotter used to attach the retainer to the valve stem in the valve mechanism of the engine is divided into two parts, for example, in a semi-cylindrical shape. Before fixing the retainer to the valve stem, the divided valve cotter is divided into two parts. Assemble the taper hole of the retainer.
[0003]
As a device for fixing the retainer in a state where the valve cotter is assembled to the tapered hole to the valve stem together with the valve cotter, there are devices described in Patent Documents 1, 2, and 3 below.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 7-1228
[Patent Document 2]
Japanese Patent No. 2816373 [0006]
[Patent Document 3]
Japanese Patent Laid-Open No. 2001-334430
[Problems to be solved by the invention]
By the way, at present, the work of assembling the valve cotter into the tapered hole of the retainer is to supply each divided valve cotter to the tapered hole using a cotter supply mechanism equipped with a parts feeder provided for each valve cotter. ing.
[0008]
For this reason, the number of cotter supply mechanisms required is equal to the number of divided valve cotters, resulting in an increase in the size of the apparatus. In addition, it is necessary to synchronize equipment among a plurality of cotter supply mechanisms, and control of the equipment is complicated.
[0009]
Accordingly, an object of the present invention is to unify the supply mechanism to the retainer of the valve cotter divided into a plurality of parts, and to prevent the apparatus from becoming large and complicated.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a valve cotter assembling apparatus for assembling a plurality of divided valve cotters for fixing a retainer pressed by a valve spring to a valve stem in a tapered hole of the retainer. the retainer, the rotation supporting mechanism for supporting and rotating the large-diameter side of the tapered hole in a state that the upper side, in the state in which the retainer is rotatably supported on the rotation supporting mechanism, a plurality of valves cotter which the divided the from above the rotation support mechanism, possess a cotter supply mechanism in a state of stacked vertically are sequentially dropped into the tapered hole of said retainer, said cotter supply mechanism, cotter housing for accommodating a plurality laminating a valve cotter vertically , A lower shutter that supports the bottom end of the plurality of valve cotters in the cotter accommodating portion, and the one retainer An upper shutter that supports the lowermost part of the valve cotter on the upper side excluding a required number of valve cotters, and when the valve cotter is dropped, the lower shutter is supported with the valve cotter supported by the upper shutter. By releasing the support of the number of valve cotters necessary for the one retainer according to the above, the number of valve cotters necessary for one retainer among the plurality of valve cotters stacked in the vertical direction is simultaneously dropped into the taper hole of the retainer. The rotation support mechanism includes a cotter guide pin that enters the tapered hole of the retainer and guides the valve cotter when the cotter is dropped, and the cotter guide pin has a taper whose outer diameter gradually increases from the upper end toward the lower end. The shape of the cotter guide pin The lower end of the valve cotter that falls first among the number of valve cotters required for the one retainer is sandwiched and fixed between the inner wall surface of the tapered hole of the retainer, and the retainer is fixed to the lower end of the valve cotter that falls earlier While rotating with the valve cotter in a state where the portion is sandwiched between and fixed to the vicinity of the lower end of the cotter guide pin, the valve cotter located at the top of the valve cotter that is dropped at the same time as the valve cotter that is dropped earlier is The configuration is such that the valve cotter that has dropped first moves relative to the valve cotter by sliding, and falls to a position facing the lower valve cotter that has dropped earlier .
[0011]
【The invention's effect】
According to this invention, in a state where the retainer is rotated in a state where the large diameter side of the tapered hole is the upper side, a plurality of divided valve cotters are stacked on the upper and lower sides from above the retainer to the tapered hole. Since it is made to drop sequentially, the supply mechanism to the retainers of the plurality of valve cotters can be made a single one, and the enlargement of the apparatus can be prevented and the supply mechanism can be made single, so that the control of the equipment can be controlled. Complexity can be prevented.
In addition, since the lower shutter and the upper shutter are used to simultaneously drop the required number of valve cotters 7 stacked on one retainer, the valve cotter can be assembled in a short time. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 is a cross-sectional view of a main part of a valve cotter assembling apparatus according to an embodiment of the present invention. This assembling apparatus is disposed above the rotation support mechanism 3 for rotating and supporting the retainer 1 attached to the valve stem in the valve mechanism of the engine, and supplies the valve cotter 7 to the tapered hole 5 of the retainer 1. A cotter supply mechanism 9 is provided.
[0014]
2, the cotter supply mechanism 9 is connected to a parts feeder 11 that accommodates a large number of valve cotters 7 shown in FIG. 1 and a lower end of the parts feeder 11, and is arranged in a row in the parts feeder 11. A chute rail 13 that receives the aligned valve cotters 7 in a vertically stacked state, and a control unit 15 that drives and controls them are provided.
[0015]
The retainer 1 described above is assembled from the rotation support mechanism 3 after the valve cotter 7 is assembled to the tapered hole 5 by this apparatus, and is fixed to a valve stem (not shown) via the valve cotter 7.
[0016]
A valve stem that is inserted into the tapered hole 5 of the retainer 1 from below in FIG. 1 is provided with a groove on the outer peripheral portion, and a protrusion formed inside the valve cotter 7 is fitted into this groove. In this state, the retainer 1 receives a spring force by a valve spring interposed between the lower surface 17a of the flange 17 on the outer peripheral side and a cylinder head (not shown), and this valve force is received by the valve cotter 7 through the tapered hole 5. The retainer 1 is firmly fixed to the valve stem.
[0017]
The rotation support mechanism 3 that rotatably supports the retainer 1 includes a rotation shaft portion 19 that is rotated by a drive mechanism (not shown), and a retainer receiving portion 21 is provided at the upper end of the rotation shaft portion 19. The retainer receiving part 21 has its disk part 21a fixed to the rotary shaft part 19, and an annular side wall part 21b protruding upward from the outer peripheral edge of the disk part 21a. And the protrusion part 29 which protrudes below the retainer 1 is inserted and fixed to the recessed part 21c formed inside this side wall part 21b, and the step part 31 outside the protrusion part 29 is made to contact the upper end of the side wall part 21b.
[0018]
Further, a cotter guide pin 33 protruding upward is provided at the upper center of the disk portion 21a. The cotter guide pin 33 has a tapered shape in which the outer diameter gradually increases from the upper end toward the lower end, and the upper end 33 a protrudes from the upper end surface 1 a of the retainer 1 and is close to the lower end of the chute rail 13.
[0019]
The dimension A between the outer periphery of the lower end of the cotter guide pin 33 and the inner periphery of the lower end of the tapered hole 5 of the retainer 1 is made smaller than the width B (thickness) dimension B of the lower end of the valve cotter 7. Further, the dimension C between the upper end surface 1 a of the retainer 1 and the lower end surface 13 a of the chute rail 13 is not more than ½ of the total length D of the valve cotter 7.
[0020]
The valve cotter 7 has a cylindrical shape whose outer peripheral surface is a tapered surface 7a and is divided into two semi-cylindrical shapes here along the central axis, and the outer diameter of the lower side of the tapered surface 7a described above is the upper side. In a state where it is smaller than the outer diameter, it is stacked and accommodated in the chute rail 13 in the vertical direction.
[0021]
The chute rail 13 includes a guide portion 35 that is inserted into the semi-cylinder of the valve cotter 7 and extends in the vertical direction so as to guide the valve cotter 7, and a space 39 serving as a cotter accommodating portion between the guide portion 35 and the outer wall 37. The valve cotter 7 is accommodated, and the valve cotter 7 moves downward in the space 39.
[0022]
The space 39 for accommodating the valve cotter 7 corresponds to a part of the tapered hole 5 in the retainer 1 in the circumferential direction.
[0023]
Cutouts 37a and 37b are provided at the lower end of the outer wall 37 of the chute rail 13 and the upper part thereof, and a lower shutter 41 and an upper shutter 43 for supporting the valve cotter 7 are inserted into the cutouts 37a and 37b, respectively. is there.
[0024]
The lower shutter 41 is movable between a forward movement position shown in FIG. 1 that supports the lower surface of the valve cotter 7 at the lowermost end and a backward movement position that releases the support of the valve cotter 7 at this forward movement position. Further, the upper shutter 43 moves between the forward position shown in FIG. 1 that supports the tapered surface 7a of the third valve cotter 7 from the lowermost end and the backward position that releases the support of the valve cotter 7 at this forward position. Is possible. That is, the upper shutter 43 supports the one at the lowermost end of the valve cotter 7 on the upper side excluding the number (here, two) of valve cotters 7 necessary for one retainer 1.
[0025]
Next, the operation will be described. First, when a large number of valve cotters 7 are introduced into the parts feeder 11 shown in FIG. 2, the introduced valve cotters 7 enter the chute rail 13 in an aligned state. At this time, the lower shutter 41 is set to the forward position to support the lowermost end portion of the valve cotter 7 to prevent the fall, and the upper shutter 43 is set to the backward position so that the valve cotter 7 can drop to the lower shutter 41.
[0026]
When the valve cotters 7 are accommodated in the chute rail 13 in a row and stacked one above the other, the upper shutter 43 is set in the forward position to support the third valve cotter 7 from the lowermost end.
[0027]
In this state, the rotation support mechanism 3 supporting the retainer 1 is rotated at a predetermined rotation speed. In this rotational state, the lower shutter 41 is set to the retracted position, so that two valve cotters 7 as many as necessary for one retainer 1 fall simultaneously toward the taper hole 5 of the retainer 1. Here, since the dimension C between the upper end surface 1a of the retainer 1 and the lower end surface 13a of the chute rail 13 is made sufficiently smaller than 1/2 of the total length D of the valve cotter 7, the valve cotter 7 is formed in the tapered hole 5. It can be reliably dropped.
[0028]
The state at the time of dropping is shown in FIG. FIG. 3B is a plan view of the retainer 1 and the valve cotter 7 on the rotation support mechanism 3 in FIG.
[0029]
When the two valve cotters 7 are simultaneously dropped, the tapered cotter guide pin 33 is guided while entering the semi-cylinder of the valve cotter 7, and as shown in FIG. Enters the lower portion of the tapered hole 5 of the retainer 1.
[0030]
At this time, as explained in FIG. 1, the dimension A between the outer periphery of the lower end of the cotter guide pin 33 and the inner periphery of the lower end of the tapered hole 5 of the retainer 1 is made smaller than the width dimension B of the lower end of the valve cotter 7. Therefore, the lower end surface of the dropped lower valve cotter 7 is in a state of floating with respect to the disk portion 21a of the retainer receiving portion 21 as shown in FIG.
[0031]
As a result, the lower valve cotter 7 that is dropped is in a state in which the inner peripheral portion and the outer peripheral portion of the lower end portion are sandwiched and fixed between the cotter guide pin 33 and the inner wall surface of the tapered hole 5 of the retainer 1. For this reason, the lower valve cotter 7 in the retainer 1 rotates with the rotating retainer 1 by the rotation of the rotation support mechanism 3. At this time, the valve cotter 7 is securely sandwiched and fixed between the cotter guide pin 33 and the inner wall surface of the tapered hole 5 of the retainer 1 by vibration generated during rotation.
[0032]
On the other hand, the valve cotter 7 that has fallen on the upper part of the rotating lower valve cotter 7 is located above the tapered hole 5, and therefore may be sandwiched between the cotter guide pin 33 and the tapered hole 5. Without sliding with respect to the rotating lower valve cotter 7, it slides against the upper end surface of the lower valve cotter 7.
[0033]
When the upper valve cotter 7 slides relative to the lower valve cotter 7 and moves to a position rotated 180 degrees from the position shown in FIG. 3 as shown in FIG. Thus, as shown in FIG. 5, it falls to a position facing the valve cotter 7 that has fallen at the lower end of the tapered hole 5. The valve cotter 7 dropped after this is also sandwiched between the inner peripheral portion and the outer peripheral portion of the lower end portion between the cotter guide pin 33 and the inner wall surface of the tapered hole 5 of the retainer 1 in the same manner as the valve cotter 7 dropped earlier. It becomes a fixed state. Thereby, the assembly | attachment operation | work to the retainer 1 of the divided | segmented two valve cotters 7 is complete | finished.
[0034]
The rotation speed of the rotation support mechanism 3 is set within a range in which the valve cotter 7 does not float from the tapered hole 5 of the retainer 1 due to the centrifugal force during rotation and does not cause a decrease in productivity. It's okay.
[0035]
The retainer 1 that has completed the assembly work of the valve cotter 7 is removed from the rotation support mechanism 3 after stopping the rotation of the rotation support mechanism 3. When removing the retainer 1 from the rotation support mechanism 3, the rotation support mechanism 3 is moved downward, for example, with respect to the chute rail 13, or moved in the horizontal direction so that the chute rail 13 does not get in the way. To do.
[0036]
Then, the retainer for assembling the valve cotter 7 is supported by the rotation support mechanism 3, and the rotation support mechanism 3 is returned to the state below the chute rail 13. Along with this, the lower shutter 41 is moved to the forward position, and the upper shutter 43 is moved to the backward position, whereby the valve cotters 7 supported by the upper shutter 43 are stacked on top of each other. At the same time, it is guided by the guide portion 35 and falls, and is supported by the lower shutter 41.
[0037]
Then, the state shown in FIG. 1 is obtained by moving the upper shutter 43 to the forward position. Thereafter, the rotation support mechanism 3 is rotated and the two valve cotters 7 are assembled to the next retainer supported by the rotation support mechanism 3 in the same manner as described above.
[0038]
According to the above-described embodiment, the plurality of divided valve cotters 7 are disposed above the retainer 1 while the retainer 1 is rotated by the rotation support mechanism 3 with the large diameter side of the tapered hole 5 being the upper side. To the taper hole 5 sequentially. For this reason, since the cotter supply mechanism 9 for supplying the plurality of valve cotters 7 to the retainer 1 can be made single, it is possible to prevent the apparatus from becoming large, and it is not necessary to synchronize the plurality of supply mechanisms. In addition, complication of control by the control unit 15 can be prevented, and the equipment cost can be reduced.
[0039]
Further, since the rotation support mechanism 3 includes a tapered cotter guide pin 33 opposite to the tapered hole 5 of the retainer 1, the falling valve cotter 7 can be surely dropped into a predetermined position in the tapered hole 5. it can.
[0040]
Further, since the two valve cotters 7 necessary for one retainer 1 are dropped at the same time using the lower shutter 41 and the upper shutter 43, the assembly work of the valve cotter 7 can be performed in a short time. Can be done.
[0041]
In the above-described embodiment, the case where the valve cotter 7 is divided into two parts has been described. However, even if the valve cotter is divided into three parts, the three required for one retainer is provided between the lower shutter and the upper shutter. This can be accommodated by storing the individual valve cotters in a stacked state.
[0043]
Furthermore, the present invention is not limited to the work of assembling the cotter to the retainer, but can be applied to an apparatus for assembling parts such as divided cotters in a cylinder such as a retainer.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part of a valve cotter assembling apparatus according to an embodiment of the present invention.
2 is an overall view of a cotter supply mechanism in the valve cotter assembling apparatus of FIG. 1; FIG.
FIGS. 3A and 3B are operation explanatory views showing a state in which two valve cotters of the valve cotter assembling apparatus of FIG. 1 are dropped, in which FIG. 3A is a sectional view, and FIG. 3B is a retainer on a rotation support mechanism in FIG. It is a top view of a valve cotter.
4A and 4B are operation explanatory views showing a state in which the rotation support mechanism is rotated 180 degrees from the position of FIG. 3, wherein FIG. 4A is a cross-sectional view, and FIG. 4B is a plane of the retainer and the valve cotter on the rotation support mechanism in FIG. FIG.
5A and 5B are operation explanatory views showing a state in which the upper valve cotter has dropped from the state of FIG. 4, wherein FIG. 5A is a sectional view, and FIG. 5B is a plan view of the retainer and the valve cotter on the rotation support mechanism in FIG. is there.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Retainer 3 Rotation support mechanism 5 Taper hole 7 Valve cotter 9 Cotter supply mechanism 33 Cutter guide pin 39 Space (cotter accommodation part)
41 Lower shutter 43 Upper shutter

Claims (3)

In the valve cotter assembling apparatus for assembling a plurality of divided valve cotters for fixing the retainer pressed by the valve spring to the valve stem in the tapered hole of the retainer, the retainer is arranged on the large diameter side of the tapered hole. a rotation supporting mechanism for rotating and supported in a state of a side, in a state where the retainer is rotatably supported on the rotation supporting mechanism, a plurality of valves cotter which the divided, from above the rotation support mechanism, vertically stacked and possess a sequential cotter supply mechanism for dropping the tapered hole of the retainer in state, the cotter feed mechanism comprises a cotter accommodating portion for accommodating a plurality stacked valve cotter vertically, a plurality of valve cotter in the cotter housing portion A lower shutter that supports the lowermost one, and that except for the number of valve cotters required for the one retainer. An upper shutter that supports the lowermost part of the valve cotter on the part side, and when dropping the valve cotter, the number required for the one retainer by the lower shutter in a state where the valve cotter is supported by the upper shutter. By releasing the support of the valve cotter, the number of valve cotters required for one retainer among the plurality of valve cotters stacked in the upper and lower directions is simultaneously dropped into the tapered hole of the retainer, and the rotation support mechanism is A cotter guide pin that enters the taper hole of the retainer and guides the valve cotter when the cotter drops is provided. The cotter guide pin has a tapered shape with an outer diameter gradually increasing from the upper end to the lower end. Between the vicinity of the lower end and the inner wall surface of the tapered hole of the retainer, Among the number of valve cotters required for the retainer, the lower end of the valve cotter that falls first is sandwiched and fixed, and the retainer places the lower end of the valve cotter that falls earlier between the lower end of the cotter guide pin and the vicinity thereof. While rotating together with the valve cotter while being sandwiched and fixed, the rotation causes the valve cotter located at the top of the valve cotter that has been dropped at the same time to move relative to the previously dropped valve cotter by sliding. A valve cotter assembling apparatus, wherein the valve cotter is dropped to a position facing the lower valve cotter that has been dropped . Several divided valve cotter for fixing the retainer to be pressed into the valve spring to the valve stem, when that assembly into the tapered hole of the retainer, the previous SL retainer, an upper-side large diameter side of the tapered hole When the valve cotter is dropped in the assembly method of the valve cotter in which the plurality of divided cotters are sequentially dropped into the tapered hole in a state where the plurality of divided cotters are stacked vertically from above the retainer while being rotated in a state where Except for the number of valve cotters required for one retainer, the lower end of the valve cotter on the upper side is supported by the upper shutter, and the lower shutter that supports the lower end of the plurality of valve cotters is used. By releasing the support of the required number of valve cotters for one retainer, a plurality of Of the cotters, the required number of valve cotters for one retainer are simultaneously dropped, and among the required number of valve cotters for the one retainer, the lower end of the valve cotter that falls first enters the tapered hole of the retainer. The valve cotter is fixed by being sandwiched between the vicinity of the lower end portion of the cotter guide pin and the inner wall surface of the taper hole of the retainer in the rotation support mechanism that guides the valve cotter when it is dropped. While rotating with the valve cotter in a state of being sandwiched and fixed between the lower end of the cotter guide pin, this rotation causes the valve cotter positioned at the top of the valve cotter that has been dropped at the same time to fall at the tip. Moved relative to the valve cotter by sliding and dropped Method of assembling a valve cotter, characterized in that to drop to a position facing the that a valve cotter. 3. The valve cotter assembling method according to claim 2, wherein the retainer is vibrated when rotating.

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