JP5549404B2 - Scissor gear assembly equipment - Google Patents

Description

  The present invention relates to a scissors gear assembling apparatus for assembling a snap ring to a main gear of a scissors gear.

  As shown in FIGS. 5 and 6, a scissors gear 1 used as an engine camshaft gear includes a main gear 4 having a bearing portion 2 and an extending portion 3 in which the bearing portion 2 extends in the axial direction, and a main gear 4. A sub gear 5 inserted through the extension 3 of the gear 4 and a gear which is provided between the sub gear 5 and the main gear 4 and elastically urges the sub gear 5 to rotate relative to the main gear 4 in the circumferential direction. A spring 6, a disc spring 7 that is attached to the extension portion 3 and presses the sub gear 5 against the main gear 4, and a snap ring groove 8 formed on the outer peripheral surface of the extension portion 3 is fitted into and supports the disc spring 7. And a snap ring 9 is provided. The main gear 4 and the sub gear 5 are respectively formed with pins 4 a and 5 a that are engaged with the gear spring 6. When the sub gear 5 is rotated with respect to the main gear 4, the respective pins 4 a and 5 a The both ends of the C-shaped gear spring 6 are pressed to deform the gear spring 6.

  When assembling the scissor gear 1, manual assembly is performed on the work table 10. Specifically, the main gear 4 is placed on the work table 10, the gear spring 6 is set in an annular spring accommodating groove 11 formed on the upper end surface of the main gear 4, and the bearing portion 2 of the main gear 4 is The sub-gear 5 is set on the main gear 4 so that the sub-gear 5 is inserted, the disc spring 7 is set on the sub-gear 5 with the convex portion 12 up, and the snap ring 9 is snap-attached tool (not shown). With the hammer ring (striking), it fits into the snap ring groove 8 of the main gear 4, and as shown in FIG. 7, the positioning tool 13 is attached to the sub gear 5 and the positioning tool 13 is rotated around the axis of the sub gear 5. The sub-gear 5 is rotated to the positioning pin press-fitting position and the gear spring 6 is deformed, and the positioning pin 14 is inserted into the main gear 4 and the sub-gear 5 to scissors. They had assembled the A 1.

JP 2005-133778 A

  By the way, since the snap ring 9 is assembled by the hammer ring, there is a problem that the metal powder that has risen during the hammer ring may adhere to the product, which is not preferable in terms of quality.

  In addition, since one worker will work until the snap ring 9 is assembled in a series of assembly operations, there is a problem that it becomes a full-time job and requires skill of the work.

  Accordingly, an object of the present invention is to provide a scissor gear assembly apparatus that solves the above-described problems and that allows a snap ring to be assembled to a bearing portion of a main gear without using a hammer ring, and that anyone can easily assemble a snap ring. It is in.

In order to solve the above-described problems, the present invention provides a main gear having a bearing portion and an extending portion in which the bearing portion extends in the axial direction, a sub gear inserted through the extending portion, the sub gear and the main gear. A spring provided between the gears for elastically urging the sub gear to rotate in the circumferential direction with respect to the main gear; and a disc spring mounted on the extension portion to press the sub gear against the main gear; A scissor gear assembling apparatus for assembling the snap ring in the snap ring groove to assemble a scissors gear fitted with a snap ring groove formed on the outer peripheral surface of the extension portion and supporting the disc spring. A work table on which the main gear is mounted with the extension portion facing upward, and a bearing portion of the main gear provided on the work table. A center shaft that extends upward, and a tapered cone that extends in the vertical direction and expands in the horizontal direction as it goes downward from the upper end, and a positioning hole for inserting and positioning the center shaft are formed in the positioning hole. When the center shaft is inserted and placed on the extension portion, the snap ring is mounted on the outer periphery, and when the snap ring is pushed down, the snap ring is enlarged in the snap ring groove. A workpiece insertion guide for guiding, and a snap ring pushing mechanism that pushes down a snap ring mounted on the outer periphery of the workpiece insertion guide , and further, when the snap ring is fitted into the snap ring groove, It has a disc spring centering mechanism that holds it in position .

  The snap ring push-in mechanism includes an air cylinder that is provided on the carriage and extends downward, and a snap ring push-down that abuts against a snap ring mounted on the outer periphery of the work insertion guide when the air cylinder provided on the air cylinder extends. A jig, and a guide pressing portion for separating the snap ring pressing jig and the work insertion guide by pressing the workpiece insertion guide downward when the snap ring pressing jig is raised. It is good to have.

  According to the present invention, the snap ring can be assembled to the bearing portion of the main gear without using the hammer ring. Also, anyone can easily assemble the snap ring.

FIG. 1 is a front view of a scissor gear assembling apparatus according to an embodiment. FIG. 2 is a side view of FIG. FIG. 3 is an enlarged view of a main part of FIG. FIG. 4 is an enlarged front view of a main part of the scissor gear assembly apparatus in which the snap ring is assembled in the snap ring groove. FIG. 5A is a development explanatory view of the scissor gear assembled by the scissor gear assembling apparatus, and FIG. 5B is a side view of the disc spring. FIG. 6 is an explanatory view of a conventional assembling method of the scissor gear. FIG. 7A is a perspective explanatory view showing the next step of the step shown in FIG. 6, and FIG. 7B is a plan explanatory view of FIG.

  A scissors gear assembling apparatus for assembling a snap ring in a snap ring groove to assemble a scissors gear will be described with reference to the drawings. FIG. 1 is a front view of the scissors gear assembling apparatus viewed from the front facing the worker's standing position, and FIG. 2 is a side view of the scissors gear assembling apparatus as viewed from the front left side. FIG. 3 is an enlarged view of a main part of the scissor gear assembly apparatus viewed from the front. The parts, positioning pins, and positioning tools that make up the scissor gear are the same as described in the background art section, so the description thereof will be omitted and the same reference numerals will be given.

  As shown in FIGS. 1, 2, and 3, the scissor gear assembling apparatus 20 includes a work table 21 for mounting the main gear 4 with the extending portion 3 facing upward, and a main gear provided on the work table 21. The center shaft 22 that extends upward to mount the bearing portion 2 of 4 and the snap ring 9 that is placed on the extension 3 and mounted on the outer periphery and snaps when the snap ring 9 is pushed down. A work insertion guide 23 for guiding the ring 9 to the snap ring groove 8 while expanding the diameter of the ring 9 and a snap ring pushing mechanism 24 for pushing down the snap ring 9 mounted on the outer periphery of the work insertion guide 23 are provided.

  Further, the scissor gear assembly apparatus 20 includes a carriage 25 for supporting the work table 21 and the snap ring pushing mechanism 24. The carriage 25 includes a shelf portion 26 for supporting the work table 21 and a ceiling portion 27 formed above the shelf portion 26 for supporting the snap ring pushing mechanism 24.

  The shelf portion 26 is provided with a rail (LM guide) 29 for guiding the slide plate 28 that supports the work table 21 so that the slide plate 28 can travel, and for sliding the slide plate 28 to reciprocate along the rail 29. An air cylinder 30 is provided. The rail 29 is formed extending linearly in the Y-axis direction. One end side (right side in FIG. 2) of the rail 29 is a gear set for an operator to set the parts of the scissors gear 1 on the work table 21 or to fix the main gear 4 and the sub gear 5 with the positioning pins 14. The snap ring push-in mechanism 24 is positioned in an assembly area 32 where the snap ring 9 is assembled to the snap ring groove 8 on the other end side of the rail 29. A first air supply unit 33 is connected to the slide air cylinder 30. The first air supply unit 33 has a solenoid valve (not shown) for supplying and stopping air to the slide air cylinder 30. This electromagnetic valve is connected to the control device 34 and opens and closes in response to a signal from the control device 34.

  The work table 21 is provided on the slide plate 28 at a substantially central position in the left-right direction. As shown in FIG. 3, the slide plate 28 is provided with a disc spring centering mechanism 35 that holds the disc spring 7 in a predetermined position when the snap ring 9 is fitted into the snap ring groove 8. The disc spring centering mechanism 35 is provided in the disc spring air cylinder 36 provided on the left and right sides (both sides in the X-axis direction) of the slide plate 28 and extending toward the center of the slide plate 28, and the disc spring air cylinder 36. And a positioning plate 37 that adjusts the horizontal position of the disc spring 7 by contacting the outer peripheral end of the disc spring 7 when the disc spring air cylinder 36 is extended. As shown in FIG. 1, a second air supply unit 38 is connected to the disc cylinder air cylinder 36. The second air supply unit 38 has a solenoid valve (not shown) for supplying and stopping air to the disc spring air cylinder 36. This electromagnetic valve is connected to the control device 34 and opens and closes in response to a signal from the control device 34.

  As shown in FIG. 3, the workpiece insertion guide 23 is formed in a tapered cone shape that extends vertically and swells in the horizontal direction as it goes downward from the upper end. The work insertion guide 23 has an upper end smaller than the inner diameter of the snap ring 9 and a lower end substantially the same diameter as the bearing portion 2 of the main gear 4 so that the snap ring 9 can be mounted on the outer periphery. Yes. A positioning hole 39 for inserting the center shaft 22 is formed on the central axis of the work insertion guide 23 so as to position the horizontal position of the work insertion guide 23 with respect to the main gear 4.

  As shown in FIGS. 1 and 3, the snap ring pushing mechanism 24 is provided on the ceiling 27 of the carriage 25 so as to be positioned above the assembly area 32 and extends downward (Z-axis direction). A snap ring pushing jig 41 that is provided in the pushing air cylinder 40 and pushes down against the snap ring 9 mounted on the outer periphery of the work insertion guide 23 when the pushing air cylinder 40 extends, and a snap ring pushing jig 41, a guide pressing portion 42 that presses the work insertion guide 23 downward and separates the snap ring pressing jig 41 and the workpiece insertion guide 23 when the snap ring pressing jig 41 rises. A third air supply unit 43 is connected to the pushing air cylinder 40. The third air supply unit 43 has a solenoid valve (not shown) for supplying and stopping air to the pushing air cylinder 40. This electromagnetic valve is connected to the control device 34 and opens and closes in response to a signal from the control device 34.

  The snap ring pressing jig 41 is formed in a cylindrical shape extending downward from the pressing air cylinder 40 and has a guide receiving hole 44 extending upward from the lower end for receiving the work insertion guide 23. The guide accommodation hole 44 is formed slightly deeper than the height of the workpiece insertion guide 23. Further, the opening 45 formed at the lower end of the snap ring pushing jig 41 is formed to have substantially the same diameter as the lower end portion of the work insertion guide 23, and the snap ring 9 is reliably pushed down to the snap ring groove 8 of the bearing portion 2. It is supposed to be.

  The guide pressing portion 42 includes a guide pressing shaft 46 that can be moved up and down on the snap ring pressing jig 41, and a contact plate 47 that is provided at the lower end of the guide pressing shaft 46 and contacts the upper end of the work insertion guide 23. A guide holding spring 48 provided on the guide holding shaft 46 for elastically biasing the contact plate 47 downward, and a guide holding shaft 46 provided on the upper end of the guide holding shaft 46 to prevent the guide holding shaft 46 from coming off. And a collar 49 for carrying out the operation. The contact plate 47 is accommodated in a contact plate accommodation hole 50 formed to extend upward from the guide accommodation hole 44 so as to be movable up and down. The guide holding shaft 46 is accommodated in a shaft accommodating hole 51 formed so as to extend upward from the contact plate accommodating hole 50 so as to be movable up and down. The shaft housing hole 51 is formed with a smaller diameter than the contact plate 47. Between the step formed between the shaft accommodation hole 51 and the contact plate accommodation hole 50 and the contact plate 47, a guide pressing spring 48 made of a coil spring is interposed. The collar 49 is housed in a collar housing hole 52 that extends upward from the shaft housing hole 51 and can be moved up and down. The collar housing hole 52 is formed to have a larger diameter than the shaft housing hole 51. The guide pressing shaft 46 is prevented from coming off when the collar 49 abuts against a step formed between the collar housing hole 52 and the shaft housing hole 51.

  Next, the operation of this embodiment will be described.

  When assembling the scissor gear 1, the main gear 4 is placed on the work table 21 in the gear set area 31 so that the extension portion 3 faces upward and the bearing portion 2 is attached to the center shaft 22. The gear spring 6 is set in the spring accommodating groove 11, the sub gear 5 is set on the main gear 4 so that the bearing portion 2 of the main gear 4 passes through the sub gear 5, and the disc spring 7 is placed with the convex portion 12 facing upward. The workpiece insertion guide 23 is placed on the bearing portion 2 while the center shaft 22 is inserted into the positioning hole 39 of the workpiece insertion guide 23, and the snap ring 9 is mounted on the outer periphery of the workpiece insertion guide 23. To do.

  When the parts of the scissors gear 1 and the work insertion guide 23 are set on the work table 21 in this manner, a start button (not shown) is pressed to start the scissor gear assembly apparatus 20. The control device 34 opens and closes the electromagnetic valve of the first air supply unit 33 to cause the slide air cylinder 30 to degenerate. As shown in FIG. 2, the slide plate 28 moves from the gear set area 31 to the assembly area 32.

  When the slide air cylinder 30 is completely retracted, the control device 34 shown in FIG. 1 controls the opening and closing of the electromagnetic valve of the first air supply unit 33 to stop the air supply to the slide air cylinder 30 and the second The disc spring air cylinder 36 is extended by opening / closing the electromagnetic valve of the air supply unit 38, and the pushing air cylinder 40 is extended by opening / closing the electromagnetic valve of the third air supply unit 43. As shown in FIG. 4, the positioning plate 37 contacts the outer peripheral end of the disc spring 7 to position the disc spring 7, and the snap ring pushing jig 41 descends to attach the snap ring 9 attached to the work insertion guide 23. Press down. The snap ring 9 descends while expanding the diameter along the taper shape of the workpiece insertion guide 23, and is moved to the outer periphery of the bearing portion 2. At this time, since the lower end portion of the workpiece insertion guide 23 is formed to have substantially the same diameter as the bearing portion 2, the snap ring 9 is smoothly moved to the outer periphery of the bearing portion 2.

  When the snap ring pushing jig 41 is further lowered, the snap ring 9 reaches the position of the snap ring groove 8 and is fitted into the snap ring groove 8. Further, when the snap ring pushing jig 41 is lowered, the contact plate 47 is also lowered together, and the contact plate 47 contacts the upper end of the workpiece insertion guide 23. When the snap ring pressing jig 41 is further lowered, the guide pressing spring 48 is deformed and presses the work insertion guide 23 downward.

  When the snap ring pressing jig 41 interferes with the workpiece insertion guide 23 and cannot be lowered, the control device 34 shown in FIG. 1 controls the opening and closing of the electromagnetic valve of the second air supply unit 38 to control the disc cylinder air cylinder 36. Is retracted, and the solenoid valve of the third air supply unit 43 is controlled to open and close to cause the pushing air cylinder 40 to retract. At this time, the work insertion guide 23 may be fitted in the guide receiving hole 44 of the snap ring pushing jig 41 shown in FIG. 4, but the guide holding spring 48 moves the work insertion guide 23 through the contact plate 47. Since the workpiece is pushed downward, the workpiece insertion guide 23 is reliably separated from the snap ring pushing jig 41 and remains on the bearing portion 2 of the main gear 4.

  When the pushing air cylinder 40 is completely retracted, the control device 34 shown in FIG. 1 controls the opening and closing of the electromagnetic valve of the first air supply unit 33 to extend the sliding air cylinder 30. As shown in FIG. 2, the slide plate 28 returns to the gear set area (original position) 31 to complete the cycle.

  As shown in FIG. 7, the operator manually attaches the positioning tool 13 to the sub-gear 5 and rotates the positioning tool 13 around the axis of the sub-gear 5 to rotate the sub-gear 5 to the positioning pin press-fitting position and the gear. By deforming the spring (not shown) and inserting the positioning pins 14 into the main gear 4 and the sub gear 5, the assembly work of the scissors gear 1 is completed.

  In this way, a work placing base 21 for placing the main gear 4 with the extending portion 3 facing upward, a center shaft 22 provided on the work placing base 21 and extending upward to mount the bearing portion 2 of the main gear 4; It is formed in a tapered cone shape that extends vertically and expands in the horizontal direction as it goes downward from the upper end, and a positioning hole 39 for positioning by inserting the center shaft 22 is formed, and the center shaft 22 is inserted into the positioning hole 39. Workpiece insertion that is mounted on the extension 3 and has a snap ring 9 mounted on the outer periphery and guides the snap ring 9 to the snap ring groove 8 while expanding the diameter of the snap ring 9 when the snap ring 9 is pushed down. Snap ring pushing mechanism for pushing down the guide 23 and the snap ring 9 mounted on the outer periphery of the workpiece insertion guide 23 downward 4 and for configuring the scissors gear assembly apparatus 20 includes a, can be assembled without by hammering the snap ring 9 to the bearing portion 2 of the main gear 4, it is possible to improve the quality of the scissors gear 1. Moreover, anyone can easily assemble the snap ring 9 to the bearing portion 2, and the manufacturing cost can be reduced.

  Further, since the disc spring centering mechanism 35 that holds the disc spring 7 in a predetermined position when the snap ring 9 is fitted into the snap ring groove 8 is provided, the disc spring 7 is securely in a predetermined position when the snap ring is assembled. The scissors gear 1 can be assembled stably.

  The snap ring push-in mechanism 24 is mounted on the outer periphery of the work insertion guide 23 when the push-in air cylinder 40 provided on the carriage 25 extends downward and the push-in air cylinder 40 extends along the push-in air cylinder 40. A snap ring pushing jig 41 that is pressed down against the snap ring 9 and a snap ring pushing jig 41 provided on the snap ring pushing jig 41 to push the workpiece insertion guide 23 downward when the snap ring pushing jig 41 is raised. 41 is provided with a guide pressing portion 42 that separates the workpiece insertion guide 23 from the workpiece insertion guide 23, the workpiece insertion guide 23 is fitted into the guide receiving hole 44 of the snap ring pressing jig 41 and integrated with the snap ring pressing jig 41. Can be prevented.

  In addition, although the workpiece insertion guide 23 is illustrated as a truncated cone having a positioning hole 39 at the center, the workpiece insertion guide 23 is not limited to this. The taper cone shape in the present embodiment includes a cone shape, a pyramid shape, and a truncated pyramid shape.

  Further, although the scissor gear assembly device 20 for assembling the scissor gear 1 used as the camshaft gear of the engine has been described, the scissor gear assembled by the scissor gear assembly device 20 is not limited to this. The scissors gear for other uses may be used.

DESCRIPTION OF SYMBOLS 1 Scissor gear 2 Bearing part 3 Extension part 4 Main gear 5 Sub gear 6 Gear spring 7 Disc spring 8 Snap ring groove 9 Snap ring 20 Scissor gear assembly device 21 Work place base 22 Center shaft 23 Work insertion guide 24 Snap ring pushing mechanism 25 Carriage 35 Belleville spring centering mechanism 39 Positioning hole 40 Pushing air cylinder 41 Snap ring pushing jig 42 Guide holding part

Claims (2)

A main gear having a bearing portion and an extending portion in which the bearing portion extends in the axial direction, a sub gear inserted into the extending portion, and a sub gear provided between the sub gear and the main gear as a main gear. A spring that is elastically biased so as to rotate in the circumferential direction, a disc spring that is attached to the extension portion and presses the sub gear against the main gear, and an outer peripheral surface of the extension portion. A scissors gear assembling apparatus for assembling the snap ring in the snap ring groove to assemble a scissors gear that is fitted in the snap ring groove and has a snap ring for supporting the disc spring. A work table that is placed facing upward, and a center shaft that is provided on the work table and extends upward to mount the bearing portion of the main gear; It is formed in a tapered cone shape that extends downward and expands in the horizontal direction as it goes downward from the upper end, and a positioning hole for positioning by inserting the center shaft is formed, and the center shaft is inserted into the positioning hole. A workpiece insertion guide that is mounted on the extension and is mounted on the outer periphery with the snap ring, and guides the snap ring groove while expanding the snap ring when the snap ring is pushed down; A snap ring pushing mechanism that pushes down a snap ring mounted on the outer periphery of the workpiece insertion guide; and a disc spring core that holds the disc spring in a predetermined position when the snap ring is fitted into the snap ring groove A scissor gear assembling apparatus characterized by comprising a dashi mechanism . The snap ring push-in mechanism includes an air cylinder that is provided on the carriage and extends downward, and a snap ring push-down that abuts against a snap ring mounted on the outer periphery of the work insertion guide when the air cylinder provided on the air cylinder extends. A jig, and a guide pressing portion for separating the snap ring pressing jig and the work insertion guide by pressing the workpiece insertion guide downward when the snap ring pressing jig is raised. The scissor gear assembly apparatus according to claim 1 provided.

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