JPH0737795Y2 - Friction gear assembly device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a friction gear assembling apparatus for assembling a main gear and a friction gear having different numbers of teeth with gear teeth aligned.

(Prior Art) For example, in a double overhead cam mechanism in an engine of an automobile or the like, in order to synchronously rotate a pair of cam shafts, gears fixed to the respective cam shafts are meshed with each other to interlock with each other. In that case, in order to prevent backlash at the gear meshing part,
It has been conventionally practiced to connect camshafts to each other by using a sub gear (hereinafter, referred to as a friction gear), which has a different number of teeth from the main gear, separately from the above gear (hereinafter, referred to as a main gear).

And in that case, the main gear and the friction gear are usually mounted by fitting the friction gear to the boss provided on the main gear, and then mounting the main gear on the camshaft and the friction gear. Then, the main gear side is pressed and urged, and the nut fixed to the cam shaft is used for positioning and fixing.

(Problems to be solved by the invention) By the way, in the above gear mounting structure, as shown in FIG. 6, the main gears A and A have a key groove C formed in the boss portion B thereof.
, Are attached to the corresponding camshafts D, D by keyway connections that engage pins E, E planted on the shafts. Therefore, the main gears A and A are positioned and attached to the corresponding camshafts D and D by the above engagement, and the main gears A and A attached to the camshafts D and D are attached to each other. Also, the gear teeth are automatically aligned with each other by the attachment, and the gear teeth of both gears A and A can be meshed together with the gear attachment at the portion shown by the arrow a in FIG. Become.

However, the friction gear F assembled to the main gears A and A is only assembled to the boss portions B and B of the main gears A and A only by fitting, and the phase of the gear teeth is set with respect to the main gears A and A. Therefore, the phases of the gear teeth of the friction gears F of the camshafts D and D are not aligned with each other. Therefore, the friction gears F and F cannot be automatically meshed at the portion indicated by the arrow a by simply connecting the main gears A and A to the camshafts D and D in the key groove. Therefore, the main gears A and A and the friction gears F and F are attached. It could not be automated and had to be installed by hand.

Therefore, in the present invention, the main gear is attached to the camshaft only so that the friction gears assembled to the main gear are automatically meshed with each other. An object of the present invention is to provide a friction gear assembling device that can be assembled by aligning teeth and therefore can be automatically attached to a camshaft.

(Means for Solving the Problems) That is, according to the present invention, a friction gear having a number of teeth different from that of the main gear is fitted and assembled to the boss portion of the main gear, and at the time of the assembling, the key of the boss portion is attached. In a friction gear assembling device in which one of the gear teeth on the friction gear side is aligned with the gear tooth on the main gear side that is at a specific position with respect to the groove, a pair that holds the main gear and the friction gear and carries them into the assembling position. Holding means and first and second jigs that are arranged to face each other and can move back and forth in the separating and contacting direction, and the first jig holds the main gear held by the holding means. An engaging portion that engages with the key groove and a drive unit that rotates and positions the main gear until they engage with each other are provided.
Further, the second jig is provided with positioning means for engaging any tooth groove of the friction gear held by the holding means to position the gear, and with the both gears positioned, the positioning means is provided. It is characterized in that jig driving means for fitting the friction gear to the boss portion of the main gear is provided by bringing the first and second jigs close to each other.

(Operation) According to the above construction, in the first jig, after the main gear held by the holding means is rotated to the positioning position by the driving means, the engaging portion is engaged with the key groove, In the second jig, the positioning state can be maintained, and in the second jig, the positioning means can be engaged with any tooth groove of the friction gear held by the holding means to maintain the positioning state. Therefore, if both gears are subsequently assembled by the approaching movement of both jigs, this assembly causes one of the gear teeth on the friction gear side to the gear tooth on the main gear side at the specific position with respect to the key groove of the boss. You can align your teeth. For this reason, in the next step, when the main gear is attached to the crankshaft by keyway coupling, this attachment alone automatically causes the main gears of the pair of crankshafts to automatically move together without requiring any manual adjustment work. While meshing, the pair of friction gears also mesh automatically.

(Example) Next, the Example of this invention is described based on drawing.

The friction gear assembling device shown in FIG. 1 has a main gear 1 and a boss portion 2 formed on the main gear 1.
A friction gear 3 having a number of teeth different from that of the main gear 1 is fitted and assembled, and at the time of the assembling, the boss portion 2
Is a device for aligning one of the gear teeth on the friction gear 3 side with a gear tooth on the main gear 1 side at a specific position with respect to the key groove 4 of the main gear 1 and the first jig 5 for the main gear and the friction. It is arranged so as to face the second jig 6 for gears.

That is, the first jig 5 has the shaft body 8 projecting from the surface of the jig body 7 facing the second jig 6, and the support shaft 9 is further inserted into the tip of the shaft body 8 in a projecting manner. The support shaft 8 is fitted and held, and the urging spring 11 is interposed between the support shaft 9 and the slide hole 10 in which the support shaft 9 is fitted, so that the support shaft 8 is constantly urged to project. In addition, a guide groove formed on the peripheral surface of the support shaft 9
By engaging the retaining pin 13 with the shaft body 8 side from the side of the shaft body 8, the support shaft 9 is prevented from coming off in a state where only the forward / backward movement is possible. A positioning pin 14 for engaging with the key groove 4 of the main gear 1 is planted at a predetermined portion of the protruding portion of the support shaft 9.

A pinion gear 15 that meshes with the gear teeth of the main gear 1 fitted on the support shaft 9 is provided below the support shaft 9, and the pinion gear 15 is configured to be rotationally driven by a motor 16 and a speed reducer 17. There is.

On the other hand, the second jig 6 has an outer diameter on the side of the jig body 18 facing the first jig 5 that is larger than that of the support shaft 9 and is substantially equal to the inner diameter of the boss portion 4 of the main gear 1. The supporting shaft 19 thus held is held in a protruding shape. This support shaft 19 is constantly biased in the projecting direction by a biasing spring 21 interposed between the support shaft 19 and the slide hole 20 into which the support shaft 19 is fitted, and the guide shaft 22 is formed in the guide groove 22 formed on the peripheral surface of the support shaft 19. By engaging the retaining pin 23 implanted in the jig body 18, the retaining pin 23 is retained only in the forward / backward movement. Also support shaft 19
A stopper portion 25 is formed in a brim-like shape at the tip of the slide hole 20 at a slight distance from the tip corresponding to the thickness of the friction gear 3, and around the tip of the slide hole 20 corresponding to the stopper portion 25. The support shaft 19 is provided with a large-diameter portion 26 that allows the tip of the support shaft 19 to slide backward to the same state as the jig body 18.

Further, in the second jig 6, a positioning pin 27 that engages with a groove (valley) of gear teeth of the friction gear 3 is provided above the support shaft 19.
Is attached to the jig body 18. The positioning pin 27 also has a slide hole formed inside the jig body 18.
28 is equipped with a biasing spring 29, so that it is urged to project.

It should be noted that the first jig 5 and the second jig 6 are different from each other in their supporting shafts 9.
And 19 are arranged coaxially, and the jigs 5 and 6 are relatively moved toward and away from each other by a driving mechanism (not shown) while maintaining the coaxial state.

Gear holding means 30 and 31 are provided for loading the main gear 1 and the friction gear 3 between the jigs 5 and 6.

The holding means 30 for the main gear has a pair of sandwiching plates 32, 33 for sandwiching the main gear 1, and one sandwiching plate 32 has an engaging portion 34 formed on the sandwiching plate 32 opposite to the first jig 5 side. The gear boss portion 2 located on the side is engaged, and the other sandwiching plate 33 sandwiches the main gear 1 from the opposite side. A notch 35 is provided in the holding plate 33 so as to correspond to the support shaft 9 of the first jig 5 so as not to interfere with the gear fitting.

The gripping means 31 for the friction gear is a pair of support plates 36, 37.
The support shaft 38 for fitting the friction gear 3 is fixed to one support plate 36, and the other support plate 37 is mounted to the mounting shaft 38.
It is configured to act as a pusher plate that pushes to the side. The support plate 37 as a pusher plate is provided with a notch 39 so as to straddle the mounting shaft 38.

For detailed movements of the above-mentioned gear gripping means 30 and 31,
The operation will be described below.

First, as shown in FIG. 1, the first jig 5 and the second jig 6 are separated from each other by a predetermined distance, and then the main gear 1
The gear gripping means 30 sandwiched by the sandwiching plates 32, 33 is carried into the front position of the first jig 5 from above. Further, the gear gripping means 31 in which the friction gear 3 is attached to the attachment shaft 38 is the second
The jig 6 is loaded into the front position from above.

On the side of the first jig 5, the gear gripping means 30 moves closer to the jig 5, and the tip of the support shaft 9 is inserted into the shaft hole of the main gear 1 gripped as shown in FIG. The pinion gear 15 is relatively engaged until 14 approaches the gear end face, and the pinion gear 15 is meshed with the gear tooth. In this state, the main gear 1 is kept pressed against the engagement pin 14, the motor 16 rotates the pinion gear 15, and the main gear 1 is rotated.

When the engagement pin 14 and the key groove 4 on the main gear 1 side are matched by this rotation, they are engaged by the above-mentioned pressing force, and the main gear 1 moves toward the inner side of the support shaft 9 in the gear gripping means 30. Is pushed in by the movement of. At the same time, the rotation of the pinion gear 1 is stopped. This state is the chain line state in FIG. 1, and in the gear gripping means 30, after the main gear 1 is pushed in, the holding plate 33 escapes upward, while the other holding plate 32 moves in the direction opposite to the gear pushing direction to move the support shaft. After escaping from 9, escape upward. As a result, the main gear 1 is held by the first jig 5 in a positioning state with the key groove 4 as a reference.

On the second jig 6 side, the entire gear gripping means 31 moves to the jig 6 side to bring the mounting shaft 39 close to the tip of the support shaft 19, and then only the support plate 37 as shown in FIG. It moves to the jig side and pushes the friction gear 6 to the jig side. As a result, the friction gear 3 is transferred from the mounting shaft 38 to the support shaft 19 and applied to the stopper portion 25. Then, during the transfer, the tip of the positioning pin 27 projects into one of the tooth spaces of the friction gear 3, and the gear 3 is slightly rotated in the process until it is completely engaged. 3 is in a predetermined positioning state. Due to this rush, the tip of the positioning pin 27 is shaped finely.

After the transfer, the support plate 37 retracts in the opposite direction to the above, and the other support plate 36 also moves in the same direction, and then ascends and returns. As a result, the friction gear 3 is attached to the second jig 6 with the positioning pin 27 as a reference.

Here, the positioning of the main gear 1 by the first jig 5,
The positioning of the friction gear 3 by the second jig 6 is performed when the main gears 1 and 1 are attached to the pair of cam shafts as shown in FIG. 6, and the gears of the main gears 1 and 1 are indicated by arrows a in FIG. It is specified with respect to the key groove 4 of the boss portion 2 so that the teeth mesh with each other and the gear teeth of the friction gears 3, 3 assembled to the main gears 1, 1 can also automatically mesh with each other at the arrow portions. This is a positioning for causing a relationship in which one of the gear teeth on the side of the friction gear 3 can be aligned with the gear tooth on the side of the main gear 1 in the position.

Next, as described above, the gear gripping means 3 is inserted from between the jigs 5 and 6.
When 0 and 31 move out, the first jig 5 and the second jig 6 move relatively closer to each other, and the tips of the support shafts 9 and 19 of both jigs 5 and 6 contact each other. Then, the support springs 9 and 19 are kept in contact with each other by the contact pressure, and the urging springs 11 and 19 are respectively maintained.
Slide backwards against 21. By this backward slide, in the second jig 6, the support shaft 19 is moved to the jig body as shown in FIG.
In the process of sliding until it becomes flush with the front surface of 18, the friction gear 3 comes out from the support shaft 19, and with this coming out, the friction gear 3 comes into contact with the boss portion 2 of the main gear 1.
Finally, as shown in FIG. 3, the main gear 1 having the friction gear 3 assembled between the first jig 5 and the second jig 6 is obtained.

Next, by separating the jigs 5 and 6 from each other, the gears 1 and 3 assembled to the support shaft 9 of the first jig 5 remain, so that the gears 1 and 3 can be appropriately held by the gripping means. Grab
Carry it to the place where it is attached to the crankshaft, and attach it to the crankshaft.

As described above, the friction gear 3 is attached to the main gear 1 by attaching it to the jigs 5 and 6 for holding the gears 1 and 3 with the key groove 4 and the positioning pin 27 as a reference. Assembling the main gear 1 at a specific position with respect to the key groove 4 of the boss portion 2 at the time of this assembling.
One of the gear teeth on the friction gear 3 side can be aligned with the gear tooth on the side. Therefore, in the next step, when the main gear 1 is attached to the crankshaft by the key groove coupling, the main gears 1 and 1 of the pair of crankshafts are not attached to each other by only this attachment, without any artificial adjustment work. Automatically meshes with each other, and the pair of friction gears 3, 3 automatically mesh with each other. Therefore, the work of attaching the main gear 1 and the friction gear 3 to the crankshaft can be automated.

4 and 5 show a fastening device 4 for mounting the gears 1 and 3 assembled as described above on the crankshaft 41.
2 shows an example of a fastening step, and the fastening device 42 fastens and fixes the friction gear 3 to the main gear 1 by fastening a nut 44 to the crankshaft 41 via a disc spring 43.

That is, the fastening device 42 has a substantially cylindrical fastening head 46 that is driven to rotate by a drive shaft 45, a pin holder 47 provided in the fastening head 46, and a core held in a protruding shape at the tip of the pin holder 47. The take-out pin 48, two engaging claws 49, 49 attached to the outer surface of the fastening head 46, and a suitable number of magnets 50 to 50 mounted on the front surface of the fastening head 46 in an exposed state.

A spring is installed between the fastening head 46 and the pin holder 47.
The pin holder 47 rotates integrally with the fastening head 46 by interposing the guide pin 52 protruding from the fastening head 46 with the guide groove 52 formed on the peripheral surface of the holder 47. In addition, it is slidable in the head. The centering pin 48 is inserted into the tip of the pin holder 47 and is biased by the biasing spring 54 so as to project.

The engaging claws 49, 49 are freely rotatable around the support shafts 55, 55,
The spring forces of the compression springs 57, 57 interposed between the fixed bases 56, 56 are always urged to rotate inward, and engage with the recesses 58 to 58 formed on the peripheral portion of the nut 44. Hold the nut 44 by. Further, the magnets 50 to 50 attract and hold the disc spring 43.

The gears 1 and 3 are attached to the crankshaft 41 by attaching the main gear 3 to the shaft side flange portion 59, and
Pin 60 of crankshaft 41 in keyway 4 of main gear 1
Are combined. On the other hand, in the fastening device 42, the nut 44 is held at the tip of the fastening head 46 by the engaging claws 49, 49, and the disc spring 43 is attracted by the magnets 50-50. And
In this state, the centering pin 48 is inserted into the tip of the crankshaft 41, and then the fastening head 46 is rotated by the drive shaft 45.
As a result, the nut 44 rotates and is screwed into the threaded portion 60 at the tip of the crankshaft 41.
The gears 1 and 3 are sandwiched between the nut 59 and the nut 44, and the friction gear 3 is pressed and fixed to the main gear 1 by the force of the disc spring 43 which is compressed.

(Effect of the Invention) As apparent from the above description, according to the present invention,
In the first jig, the main gear held by the holding means is rotated by the drive unit to the positioning position, and then the engagement portion is engaged with the key groove to maintain the positioning state. Can engage the positioning means with the tooth groove of the friction gear held by the holding means to maintain the positioning state. Therefore, if both gears are subsequently assembled by the approaching movement of both jigs, this assembly causes one of the gear teeth on the friction gear side to the gear tooth on the main gear side at the specific position with respect to the key groove of the boss. Can be assembled with aligned teeth. For this reason, in the next step, when the main gear is attached to the crankshaft by keyway coupling, this attachment alone automatically causes the main gears of the pair of crankshafts to automatically move together without requiring any manual adjustment work. While meshing, the pair of friction gears also mesh automatically. Therefore, the main gear and the friction gear can be attached to the crankshaft by moving.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a sectional view of a friction gear assembling device, FIG. 2 is an explanatory view of positioning operation of the friction gear assembling device, and FIG. FIG. 4 is a front view of the nut fastening device, and FIG. 5 is a sectional view of the nut fastening device in use. Fig. 6 shows when the gear is attached to the crankshaft,
It is a schematic diagram for explaining the conventional inconvenience. 1 ... main gear, 2 ... boss part, 3 ... friction gear, 4 ... key groove, 5 ... first jig, 6 ... second jig, 14 ... engaging part (positioning pin), 15 …… Drive means (pinion gear), 27 …… Positioning means (positioning pin), 30,31 …… Holding means (gear gripping means).

Claims (1)

[Scope of utility model registration request] Claims: 1. A boss portion of a main gear is fitted with a friction gear having a number of teeth different from that of the main gear and assembled, and at the time of the assembling, a main gear side at a specific position with respect to a key groove of the boss portion. Is a friction gear assembling device in which any one of the gear teeth on the friction gear side is aligned with the gear teeth of the above, and a pair of holding means for holding the main gear and the friction gear respectively and carrying them into the assembling position are opposed to each other. And a first jig and a second jig which can be moved back and forth in the separating and contacting direction and which engage with the key groove of the main gear held by the holding means. And a drive means for rotating and positioning the main gear until they engage with each other.
The jig is provided with positioning means that engages with one of the tooth spaces of the friction gear held by the holding means to position the gear, and the first and second gears in a state where both gears are positioned. A friction gear assembling apparatus, comprising jig driving means for fitting a friction gear to a boss portion of a main gear by bringing a second jig close to the boss portion.