JPS6236815B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a rotation transmission mechanism assembly device for assembling a rotation transmission mechanism in which rotation transmission members such as gears, cams, and collars are press-fitted and fixed to a rotation shaft rotatably inserted into a bearing hole of a bearing member. Regarding.

Generally, rotation transmission mechanisms are widely used as components of equipment in various industrial fields. Figure 1 shows a rotation transmission mechanism used in the measuring device of a watt-hour meter. , 5 are bored, a rotary shaft 8 is rotatably inserted into these bearing holes 4 and 5, and a rotation transmission member consisting of a gear 6 and a collar 7 for preventing the shaft from slipping out is press-fitted into the middle part of the rotary shaft 8. It is formed in a fixed manner.

Conventionally, to assemble this rotation transmission member, a second
As shown in the figure, once the recesses 1 in the split molds 9a and 9b are
Gear 6 and collar 7 held in 0 and 11 respectively
The rotary shaft 8 was pushed and press-fitted by a press-fitting bar 13 along the guide groove 12 which also served to prevent buckling of the shaft, and then the gear 6 and collar 7 were press-fitted and fixed as shown in FIG. The left end of the rotating shaft 8 is deeply inserted into the bearing hole 4, which has a diameter slightly larger than that of the rotating shaft 8, along the arrow a in the figure, and then the right end of the rotating shaft 8 is inserted into the other bearing hole 5 along the arrow b in the same figure. It was inserted and assembled.

However, in the conventional assembly method described above, the press-fitting of the rotary shaft 6 and the insertion into the bearing hole are performed separately, so there are many assembly steps, and the insertion step shown in FIG. 3 is performed manually. work efficiency is poor. Moreover, when the distance L between each bearing hole 4, 5 and the end 1a of the bearing member 1 is large,
Using the clearance between the bearing hole 4 and the rotating shaft 6, the rotating shaft 6 cannot be inserted into the bearing hole 4 by the method shown in FIG. 3, and as a result, the distance L cannot be increased beyond a certain value. However, there was an inconvenience in that the shape of the bearing member 1 was restricted.
Furthermore, in order to automatically carry out the above-mentioned assembly method, an industrial robot or the like that performs complicated operations is required, which may result in high costs.

Furthermore, conventionally, as shown in FIGS. 4 and 5, the rotating shaft 8 is press-fitted into the gear 6 and the collar 7 separately.
Later, an assembly method as shown in Figure 3 was proposed. That is, as shown in FIG.
A gear 6 is placed on top of the gear 6, a guide claw 15 and a buckling prevention claw 16 are provided in a closed state above the gear 6, and each guide groove 1 is arranged in a straight line.
4a, 15a, 16a and center hole 6a of gear 6
The rotating shaft 8 is pushed in from above using the press-fitting bar 13 toward the position. During this pressing, the buckling prevention pawl 16 opens as shown by arrow a in FIG. 4 when the press-fitting bar 13 approaches. Then, the stopper 17 protrudes to determine the press-fitting depth of the rotary shaft 8 at a constant level. Thereafter, as shown in FIG.
The collar 7 is supported by being inserted through the guide groove 18a of the collar 8, and is positioned concentrically directly above the collar 7 placed on the collar receiver 19, and is pushed down by the pusher bar 13 and the collar 7 is pushed down by the stopper 20. Press it into a certain position.

In the conventional method described above, since the rotary shaft 8 is press-fitted into the gear 6 and the collar 7 separately, the structure of the supply device and chuck for press-fitting is simplified, and the press-fitting operation is also simplified. The distance _L1 between the gear 6 and the collar 7 was not constant, and there was also an inconvenience in the assembly work shown in FIG.

Conventionally, as shown in FIGS. 6a and 6b, a device has been proposed in which the rotating shaft 8 is inserted into each of the bearing holes 4 and 5 and press-fitted into the gear 6 and collar 7 all at once. That is, the positioning clamping member 21a of the jig 21,
21b holds the bearing member 1 in a fixed position, and the gear 6 and collar 7, which are held by the recesses 23 and 24 of the chuck 22, which open and close in the direction of the arrow c in FIG. At the same time, the groove of the positioning block 25 attached to the chuck 22 is engaged with the positioning block 21c provided on the jig 21, so that the bearing holes 4, 5, the rotation center hole of the gear 6, and the collar 7 are positioned concentrically. Next, the rotating shaft supplying device 26 with the rotating shaft 8 housed in the guide groove 26a is moved in the direction of the arrow d in FIG. position them concentrically, and then push the rotating shaft 8 to the right with the press-fitting bar 13 as shown in FIG. I was letting it happen. When pushing the rotating shaft 8, the rotating shaft supply device 2
The rotating shaft 8 is prevented from buckling by a buckling prevention plate 28 which is swingably attached to the upper surface of the rotary shaft 8.

However, in this conventional device, since the centering of the gear 6 and collar 7 with respect to the bearing hole and the centering with the rotating shaft 8 are performed using different gauges, indirect centering is performed, so there is a misalignment between them. It was easy for this to occur, and it was not possible to correct the misalignment that occurred. Further, since the pressing by the press-fitting bar 13 is performed with a large constant thrust required to press-fit the rotary shaft 8 into the gear 6 and the collar 7,
Even if the center of the shaft is misaligned, the rotating shaft 8 will be forcibly inserted into the bearing holes 4 and 5.
Scratches and deformation occur on the inner surface of the rotary shaft, making it impossible to accurately transmit rotation through the rotation transmitting mechanism.

The present invention has been made in view of these points, and it is possible to accurately position rotation transmission members such as a bearing hole, a rotating shaft, and gears concentrically during assembly.
In addition, the pushing thrust of the rotating shaft can be made larger when it is press-fitted into the rotation transmission member than when it is inserted into the bearing hole.
It is an object of the present invention to provide a rotation transmission mechanism assembly device which allows a rotating shaft to be inserted into a bearing hole without damaging or deforming it, and which has high assembly efficiency.

The present invention will be described below with reference to embodiments shown in FIGS. 7 to 15.

8 to 11 show that in the rotation transmission mechanism shown in FIG. 7, the rotating shaft 8 is inserted into the first bearing hole 4 and the second bearing hole 5 with a small thrust, and the gear 6 and the collar 7 are inserted with a large thrust. 1 shows an embodiment of the device of the present invention which is assembled by press-fitting.

The apparatus of this embodiment includes a chuck 29 that grips the gear 6 and the collar 7 and positions them concentrically with the bearing holes 4 and 5 of the bearing member 1;
A rotating shaft supplying device 31 that engages with a positioning block 30 provided at 9 to position the rotating shaft 8 concentrically with the bearing holes 4 and 5; The rotary shaft pushing device 32 is configured to push the rotary shaft in the direction of the bearing holes 4 and 5, and has a thrust adjustment mechanism 33 that adjusts the pushing thrust.

To explain further, the rotating shaft pushing device 32 has the eighth to
It is configured as shown in FIG. That is, the long press-fit bar 34 is connected to the rotating shaft 8 by the housing 35.
It is supported so that it can freely reciprocate in the pushing direction.
A press-fitting piece 36 is attached to the tip of this press-fitting bar 34 (right end in FIG. 8). On the other hand, an end block 44 is fixed to the rear end with a bolt 59.
A dog 38 is fitted onto the press-fit bar 34 with a sleeve 60 between the end block 44 and the flange 42 so as to be slidable in the axial direction. This dog 38 engages with a roller 46 attached to the upper end of a bell crank 41 which is swung around a shaft 40 by a drive rod 39, and as the bell crank 41 swings, it slides on the press-fit bar 34. The press-fit bar 34 is configured to move and transmit the power to the press-fit bar 34 via a compression spring 43 stretched between the flange 42 and the sleeve 60. A detection switch 45 is also attached to the end block 44 for detecting abnormal rightward movement of the dock 38 independently of the press-fitting bar 34. Further, at the rear end of the end block 44,
A power transmission plate 37 is brought into contact with the press-fitting bar 34 by a driving device such as a cam or a hydraulic cylinder, which applies a thrust sufficient to press-fit the rotary shaft 8 into a gear or the like.

The rotating shaft supply device 31 is constructed as shown in FIG. 8 and FIGS. 10 and 11. That is, the entire device 31 is formed so as to be able to reciprocate in the direction of arrow a in FIG. A buckling prevention plate 48 is attached. This buckling prevention plate 48 normally covers the guide groove 31a at its tip by a tension spring 49, but when it engages and is pushed by the press-fitting piece 36 during the press-fitting operation, it swings and prevents the advancement of the press-fitting piece 36. Works out of the way. Further, the rotary shaft supply device 31 is provided with a vertical groove 50 that engages with a positioning block 30 attached to the chuck 29.

The chuck 29 is constructed as shown in FIGS. 8 and 11. That is, the chuck 29 is provided so as to be movable in two directions perpendicular to the arrows a and b in FIG. It has shaft support pieces 52, 52 that open and close with a split. One clamping piece 51 has recesses 53 and 54 that hold the gear 6 and collar 7, and a guide groove 55 that guides the rotating shaft 8 while preventing it from buckling. It has a guide groove 56 into which it is inserted.
And each guide groove 55, 56 and recess 53, 54
are formed concentrically. The chuck 29 also has a positioning block 30 for positioning the rotary shaft supply device 31 in association with the chuck 29, as well as a positioning block 21c that engages with a positioning block 21c provided on the jig 21 to connect the bearing holes 4, 5, the gear 6, and the collar. A positioning block 57 is provided for positioning 7 concentrically.

Next, the assembly operation according to this embodiment will be explained.

First, the positioning clamping members 21a, 21 of the jig 21
The bearing member 1 is fixed in the assembly position by b. Next, the rotating shaft supply device 31 with the rotating shaft 8 inserted into the guide groove 31a is advanced in the direction of arrow a in FIG. A chuck 29 is provided with a clamping piece 51 in a closed state holding a gear 6 and a collar 7, respectively, and a shaft support piece 52 in a closed state.
is advanced in the direction of the arrow b in FIG. 11, and when it reaches above the bearing member 1, is lowered in the direction of the arrow in FIG. 11a. When the chuck 29 is lowered, the positioning block 57 engages with the positioning block 21c provided on the jig 21, and the guide groove 5 of the clamping piece 51 and the shaft supporting piece 52 is closed.
5, 56 and the rotation center hole of the gear 6 and collar 7 are positioned concentrically with the bearing holes 4, 5, and the other positioning block 30 simultaneously engages with the vertical groove 50 of the rotation shaft supply device 31, so that the rotation shaft The guide groove 31c in which the bearing hole 8 is housed is positioned exactly concentrically with the bearing holes 4 and 5. Next, the drive rod 39 of the thrust adjustment mechanism 33 is pulled down by a cam or the like, and the bell crank 41
rotates about the shaft 40 in the direction of the arrow in FIG.
Dog 38 is pushed to the right by roller 46.
The right row of the dog 38 is transmitted to the pressure bar 34 via the compression spring, and the pressure bar 34, the dog 38, the compression spring 43 and the bell crank 41
The press-fitting bar 34 and the press-fitting piece 36 are moved to the right with a small thrust by the small thrust generating device. Then, the press-fitting piece 36 guides the rotating shaft 8 into the guide groove 31a.
As a result, the rotating shaft 8 is inserted through the bearing hole 4 and the guide groove 55 in this order. Rotating shaft 8
When the tip of is in front of gear 6, bell crank 41
rotation is stopped, and then the power transmission plate 37 is moved to the right with a large propulsive force sufficient to press the rotary shaft 6 into the end block 4.
4, the press-fitting bar 34 and the press-fitting piece 36 move to the right with a large driving force and press-fit the rotary shaft 8 into the rotation center hole of the gear 6 and the collar 7. During this press-fitting, the rotating shaft 8 is prevented from buckling by the guide groove 31a, the buckling prevention plate 48, and the guide groove 55. When the tip of the rotary shaft 8 reaches just before the other bearing hole 5, the power transmission plate 37 stops, and at the same time the clamping pieces 51, 51 open. As a result, the rotating shaft 8 is supported in a hollow manner by the bearing hole 4 and the guide groove 56 of the shaft support piece 52. Next, the bell crank 41 is moved again in the direction of the arrow in FIG. 8, the press-fitting bar 34 and the press-fitting piece 36 move to the right, and the rotary shaft 8 is pushed with a small thrust so that its tip is inserted into the other bearing hole 5. after that,
The bell crank 41 and the power transmission plate 37 are returned to their original positions in this order, the press-fitting bar 34 and the press-fitting piece 36 are returned to the rear, and at the same time, the shaft support piece 52 is opened and the chuck 29 is raised, causing the bearing member 1 to rotate. The shaft 8, gear 6 and collar 7 are left on the jig 21 in the assembled state. Thereafter, the assembled rotation transmission mechanism is sent to the next process together with the jig 21, and a new bearing member 1 is transported by the new jig 21. Then, the assembly work is repeated in the same manner as above.

Also, when pushing the rotating shaft 8 with a small thrust by the bell crank 41, the bearing holes 4 and 5 are inserted into the bearing member 1.
If the bearing holes 4 and 5 are not concentric with the guide hole 31a, the tip of the rotating shaft 8 will abut against the side walls 2 and 3 of the bearing member 11. Then, the rightward movement of the press-fitting bar 34 and the press-fitting piece 36 is stopped, and only the dog 38 moves abnormally to the right while compressing the compression spring 43, touches the contact terminal 58 of the detection switch 45, and the detection switch 45 is activated.
The cam etc. that drive 1 are stopped.

Figures 12 and 13 show the thrust adjustment mechanism 3 of the device of the present invention.
This shows another embodiment of No. 3, in which the press-fitting bar 34 is driven only by the bell crank 41. That is, a small thrust is obtained by pushing the dot 38 with the rollers 46 provided at each tip of the bifurcated bell crank 41 and pushing the press-fitting bar 34 via the compression spring 43, and when press-fitting the rotary shaft. A large thrust force can be obtained by bringing the distal end surface 60a of the sleeve 60 into contact with the flange 42 and directly pushing the press-fitting bar 34 with the bell crank 41. Also, as shown in Figure 12,
An engaging protrusion 61 is fixed to the end block 44, and micro switches 62 and 63 that operate in conjunction with the engaging protrusion 61 are provided to detect the start and completion of insertion of the rotating shaft 8, and to control the thrust of the bell crank 41. may be adjusted.

FIG. 15 shows a bearing member 1 as shown in FIG.
A chuck of the device of the present invention is used when assembling a gear 64 on the outside of the side wall 3 of the device, inserting the rotating shaft 8 into the bearing holes 4 and 5, and press-fitting the gear 6, collar 7, and gear 64. Another example is shown below.
This chuck 29 includes clamping pieces 51, 51 having recesses 53, 54 for holding the gear 6 and collar 7 in the middle and a guide groove 55, and a gear 64 on the outside.
It is formed by an outer clamping piece 67 having a recess 65 for holding the rotary shaft 8 and a guide groove 66 for supporting the rotating shaft 8 in the intermediate portion. Then, one of the clamping pieces 51, 51 is opened after the rotating shaft 8 is press-fitted into the gear 6 and collar 7 in the intermediate portion, and then the rotating shaft 8 is opened.
is press-fitted into the next outer gear 64 while being hollowly supported by the bearing hole 4 and the guide hole 66.

Since the rotation transmission mechanism assembly device of the present invention is constructed in this manner, the rotation shaft is supplied based on the chuck that positions the rotation transmission member such as a gear held inside concentrically with respect to the bearing hole of the bearing member. Since the device is aligned, the rotating shaft, the rotation transmitting member, and the bearing hole are aligned accurately and reliably concentrically, making assembly easier. Also, the rotating shaft has a thrust adjustment mechanism that allows the rotating shaft to be inserted into the bearing hole with a small propulsive force. The rotation transmitting member is not forced into the bearing hole because it is pushed against the shaft, which prevents damage or deformation of the bearing hole, and the assembled rotating shaft can always rotate smoothly. Accurate rotation can be transmitted, and if a bearing hole is not drilled in the bearing member, this can be detected and the pushing of the rotating shaft can be stopped, thereby preventing defective assembly due to forceful pushing of the rotating shaft. It is possible to prevent galling and deformation of the components of the device and the various parts of the device, thereby preventing failure of the device.Also, the structure is simple, and the continuous automatic assembly of the rotation transmission mechanism is facilitated. play.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a gear transmission mechanism, Fig. 2 is a vertical sectional view of a chuck portion showing a conventional rotary shaft press-fitting device, Fig. 3 is a perspective view showing a conventional assembled state, and Fig. 4-5 The figures are longitudinal cross-sectional views showing other examples of rotary shaft press-fitting devices, FIG. 6a is a vertical cross-sectional side view of a conventional device for press-fitting and assembling rotary shafts all at once, and FIG. 6b
is a right side view of FIG. 6a, FIG. 7 is an exploded perspective view of the rotation transmission mechanism, FIG. 8 is a vertical side view of the rotation transmission mechanism assembly device of the present invention, and FIG. 9 is a view taken in the direction of the arrow in FIG. 8. ,
10 is a view in the direction of the X arrow in FIG. 8, FIG. 11 is a view in the direction of the XI arrow in FIG. 8, FIG. 12 is a view similar to FIG. 9 showing another example of the thrust adjustment mechanism of the device of the present invention, 13 is a view taken in the direction of the arrow in FIG. 12, FIG. 14 is an exploded perspective view showing another example of the rotation transmission mechanism, and FIG. be. 1... Bearing member, 4, 5... Bearing hole, 6... Gear, 7
...Collar, 8...Rotation axis, 29...Chuck, 30...
Positioning block, 31... Rotating shaft supply device, 32
...Rotary shaft pushing device, 33...Thrust adjustment mechanism, 34...
Press-fit bar, 38...Dog, 41...Bell crank,
42...flange, 43...compression spring, 64...gear.

Claims (1)

[Scope of Claims] 1. In a rotation transmission mechanism assembly device for assembling a rotation transmission mechanism in which a rotation transmission member such as a gear or a cam is press-fitted and fixed to a rotation shaft rotatably inserted into a bearing hole of a bearing member, the rotation transmission a chuck that grips the member and orients the rotation center hole of the rotation transmitting member concentrically with the bearing hole; and a rotation that engages with a positioning block provided on the chuck to orient the rotation shaft concentrically with the bearing hole. a shaft feeding device; and a rotating shaft pushing device including a press-fit bar for pushing the rotating shaft in the rotating shaft feeding device in the direction of the bearing hole and the rotation center hole; A thrust adjustment mechanism is provided that reduces the pushing thrust of the rotating shaft when passing through the first bearing hole, increases the thrust when passing through the rotation center hole, and reduces the thrust when passing through the second bearing hole, and The thrust adjustment mechanism includes a power transmission plate that drives the press-fit bar with a large thrust in the axial direction from the rear of the press-fit bar, and a large thrust generating device that operates when the rotation shaft is inserted into the rotation center hole; A dot fitted onto the press-fit bar so as to be slidable in the axial direction; a compression spring tensioned between the dot and a flange formed on the press-fit bar; and a bell crank that swings as it moves up and down to apply an axial thrust to the dock that is smaller than the thrust of the power transmission plate,
a small thrust generating device that operates when the rotating shaft is inserted into the first and second bearing holes, and further characterized in that the thrust adjusting mechanism is equipped with a detection switch that detects abnormal compression of the compression spring. A rotation transmission mechanism assembly device.