JPH056024Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field The present invention is an automatic method for manufacturing a workpiece having a shaft hole with a spline in the center of a shaft member with a spline section formed on the outer periphery. related to a device for assembly.

(2) Prior Art Conventionally, the work of assembling the clutch outer to the clutch shaft involves manually inserting the spline holes of the clutch outer into the spline portion of the clutch shaft while aligning the phases, and then using an impact wrench to assemble the clutch outer onto the clutch shaft. This was done by tightening a fixing nut onto the threaded part at the end.

However, the productivity of manual assembly as described above is extremely low, and it has been desired to automate the assembly. In this case, a gripping claw for removably gripping the workpiece and a rotatable tightening shaft having a socket for receiving a fixing nut facing the shaft hole of the workpiece gripped by the gripping claw are rotatably provided, and the workpiece is held in the gripping claw. It is conceivable to fit the fixing nut into the spline portion of the shaft member while being gripped, and then tighten the fixing nut into the threaded portion of the shaft member by rotating the tightening shaft.

(3) Problems to be solved by the invention However, since the fitting tolerance of the spline is precisely set, it is difficult to fit the two parts by adjusting the phase between the spline part of the shaft member and the spline hole of the workpiece. In other words, in order to fit the spline hole of the workpiece into the spline part of the shaft member, it was extremely difficult to perform phase alignment by rotating the gripping claws while gripping the workpiece.
There has been a problem in that a large load is applied to the spline due to the drive of the gripping claws, resulting in galling or damage.

The present invention was developed in view of the above-mentioned circumstances, and enables automatic assembly by fitting the spline hole of the workpiece into the spline portion of the shaft member without applying almost any load to them. The purpose is to provide a workpiece assembly device that makes it possible to assemble a workpiece.

B. Structure of the device (1) Means for solving the problem In order to solve the above problem, the present invention involves fitting a spline hole formed in a boss portion of a workpiece into a spline portion formed in a vertically held shaft member. match,
A workpiece assembling device for tightening a fixing nut into a boss formed at the end of the shaft member; a shaft that removably grips and moves a workpiece and vertically holds the boss of the workpiece in a predetermined position; A gripping claw inserted into the member engages with an opening formed in the workpiece from above to rotate the workpiece around the shaft member, aligning the phases of the spline hole of the boss portion and the spline portion of the shaft member and fitting them together. and a tightening shaft which has a socket at its lower end facing the threaded portion of the shaft member and which tightens a fixing nut held in the socket into the threaded portion.

(2) Effect According to the workpiece assembly device of the present invention having the above-described configuration, the gripping claws that grip the workpiece are moved, and the boss portion formed on the workpiece is moved against the shaft member that holds the boss portion vertically in a predetermined position. and insert it from above. At this time, the spline hole formed in the boss portion of the workpiece and the spline portion formed in the shaft member are not in phase with each other, and the splines of both members cannot be fitted. From this state, the gripping claws are released from the grip, and a positioning pin that engages from above in an opening formed in the workpiece is driven to rotate the workpiece around the shaft member. During the process of rotation of the workpiece, when the spline hole of the workpiece and the spline portion of the shaft member match in phase, the workpiece descends under its own weight and the splines are fitted. Subsequently, the tightening shaft rotates to tighten the fixing nut held inside the socket into the threaded portion of the shaft member, completing the assembly of both members.

(3) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 8 show an embodiment of the workpiece assembly device according to the present invention, in which FIG. 1 is an overall front view, FIG. 2 is a partial cross-sectional plan view, and FIG.
Figure 4 is a view along the line in Figure 1,
Fig. 5 is a view taken along the line in Fig. 2 showing the work rotation mechanism, Fig. 6 is also a view taken in the line shown in Fig. 2, and Fig. 7 is a side view of the drive unit located at the top of the assembly head. ,
FIG. 8 is a partially cutaway plan view as well.

As shown in FIG. 1, the assembly head 1 is equipped with a fixing sleeve 4 fixed with a bolt 3 so as to hang downward from a base 2.
An upper tightening shaft 5 having an engaging/disengaging portion 5a at its upper end with which a nut runner engages is rotatably supported inside by a pair of bearings 6a, 6b.
At the bottom of the upper tightening shaft 5, a lower tightening shaft 7 having a socket 7a for receiving a fixing nut at its lower end is rotated via a chamfered portion 56 while being urged downward by a spring 8. It is immovably supported so that it can slide up and down. Furthermore, the lower end inner periphery of the lower tightening shaft 7 has a tapered guide portion 9a at its tip to be inserted into the screw hole of the fixing nut, and a magnet 9b that attracts and holds the fixing nut.
A nut holding member 9 having a nut holding member 9 is supported so as to be vertically slidable while being urged downward by a spring 10.

A base portion 11a of a cylindrical support frame 11 is rotatably inserted into the outer periphery of the fixed sleeve 4 while being urged downward by a spring 12.
The position of the lower end of the base 11a of the support frame 11 is regulated by a nut 13 screwed onto the fixing sleeve 4. And, on the outer periphery of this support frame 11,
Clutch outer W, which is a workpiece at equal intervals of 120 degrees
A gripping claw 14 for gripping is pivotally supported by a pivot shaft 15, and is urged in a closing direction by a spring 16.

As is clear from FIG. 3 in addition to FIG.
It consists of a first gripping claw 14a that grips the clutch outer W and a second gripping claw 14b that grips the small-diameter clutch outer W, and both gripping claws 14a and 14b are mounted in an overlapping state. Further, the support frame 11 has bolts 17.
Three brackets 18 are fixed by a spring 20. Inside each bracket 18 is a positioning pin 19 that engages from above with an opening W1 formed in a clutch outer W held by a gripping claw 14. It is attached so that it can freely slide up and down while being biased downward. Furthermore, the bracket 1
Three rods 22 are attached to the stay 21 protruding from 8.
is supported so that it can freely slide up and down, and this rod 2
A plate 24 having a cylindrical pressing member 23 surrounding the nut holding member 9 at the center is supported at the lower end of the nut holding member 9. This pressing member 23 has a spring 25 mounted between it and the fixed sleeve 4.
The lowering position of the rod 22 is regulated by a nut 26 screwed onto the tip of the rod 22.

A movable sleeve 27 is provided on the outer periphery of the base 11a of the support frame 11, and the sleeve 27 is supported in a state in which relative rotation is regulated by a rotation stopper 27a and is urged upward by a spring 28. ing. A roller 29 is provided on the upper flange 27b of this movable sleeve 27, and the base 2
The movable sleeve 27 is moved downward by bringing an arm 31 (see FIG. 2), which is pivotally supported by a pivot 30 on the lower surface of the sleeve, into contact with the roller 29. When the lower flange 27c of the movable sleeve 27 pushes down the pin 32 supported on the support frame 11, the gripping claws 14 are expanded to the position shown by the chain line against the elastic force of the spring 16.

One of the three rods 22 supporting the pressing member 23 mounted on the lower part of the support frame 11 so as to be movable up and down is provided with a block 33 at the upper end, and this block 33 is provided with the upper and lower ends of the movable sleeve 27. Lower rod 34a passing through flanges 27a, 27b
The bottom edges of are in contact with each other. Further, an upper rod 34b whose upper end is connected to a detector (not shown) passes through the base 2, and a disc-shaped saucer 35 provided at the lower end thereof is in contact with the upper end of the lower rod 34a. Therefore, when the support frame 11 is rotated by the work rotation mechanism to be described later, the upper end of the lower rod 34a that rotates together with the support frame 11 is connected to the upper end of the upper rod 34b, as shown in FIG. It slides along the lower surface of the saucer 35.

Next, the work rotation mechanism 36 will be explained based on FIGS. 2, 5, and 6.

A stopper 37 is connected to a bolt 38 on a movable sleeve 27 that is supported on the outer periphery of the support frame 11 so as to be slidable up and down.
The rotation range of the stopper 37 is regulated by stopper bolts 41a, 41b that screw together a pair of side plates 40a, 40b fixed to both sides of the stay 39 hanging from the base 2. There is. A spring hook 42 is screwed onto the stopper 37, and a hook bolt 44 is screwed into the spring hook 42 and a bracket 43 fixed to the one side plate 40a.
A spring 45 is stretched between the two. Furthermore, a drive arm 46 is fixed to the movable sleeve 27, and a drive rod 47 is erected upward at the tip thereof. Therefore, this drive rod 47
When pressed, the movable sleeve 27 rotates via the drive arm 46, and the support frame 11 connected to the movable sleeve 27 with a rotation stopper 27a also rotates together.

As shown in FIGS. 7 and 8, the assembly head 1
The cylinder 4 is mounted on the upper base 48 located above the cylinder 4.
A rod 50 of the cylinder 49 presses the upper end surface 31a of the arm 31 to lower the movable sleeve 27, thereby expanding the gripping claws 14. Further, a nut runner 51 is attached to the upper base 48,
The tip of the drive shaft 52 can be engaged with the engaging/disengaging portion 5a of the upper tightening shaft 5. Furthermore, a robot seat 54 is provided at the lower end of a bracket 53 that hangs down from both sides of the upper base 48, and this bracket 5
A cylinder 55 is attached to the outside of the cylinder 3. A pusher 58 guided by a guide 57 is attached to the rod 56 of the cylinder 55, and when the pusher 58 presses the upper end of the drive rod 47, the movable sleeve 27 is rotationally driven. Ru. As mentioned above, the cylinder 49, the nut runner 51, and the cylinder 55 provided on the upper base 48 constitute the driving section 59, and the aforementioned assembly head 1 is driven through this driving section 59. It will be done.

Next, the operation of one embodiment of the workpiece assembling apparatus according to the present invention having the above-mentioned configuration will be described.

When the assembly head 1 is moved by a drive unit (not shown) and approaches the upper part of the fixing nut N (FIG. 9) supplied from the parts feeder, this fixing nut N is attached to the tapered shape of the nut holding member 9. It is guided by the guide portion 9a and held by the magnet 9b. Next, when the assembly head 1 is moved to the upper part of the clutch outer W and lowered, the grip claws 14 automatically expand while sliding along the side of the clutch outer W, and as shown in FIG. 16
The lower part of the clutch outer W is gripped from three sides by the elastic force of the clutch outer W. At the same time, three positioning pins 19
engage with three of the six openings W1 formed at equal intervals in the clutch outer W from above. At this time, the fixing nut N in contact with the boss portion W2 of the clutch outer W moves upward while compressing the spring 10 together with the nut holding member 9, and is held in the socket 7a of the lower tightening shaft 7. The pressing member 23 in contact with the upper surface of the clutch outer W moves upward while compressing the spring 25, and presses the clutch outer W against the tip of the gripping claw 14.

Next, the arm 31 is moved by moving the assembly head 1 to the top of the vertically held clutch shaft S (FIG. 10) and extending the cylinder 49 (FIG. 7) provided in the drive section 59. Rock it downward. Then, the roller 29 is pressed down by the pressing portion 31a at the tip of the arm 31, and the movable sleeve 27 is lowered, and the pins 32 pressed down by the movable sleeve 27 expand the gripping claws 14 all at once. Clutch outer W released from grip in this way
is pushed by the pressing member 23 and falls to the position shown in FIG. At this time, the threaded portion S of the clutch shaft S
1 is inserted into the spline hole W3 of the boss portion W2 of the clutch outer W, but since the spline portion S2 of the clutch shaft S does not match in phase, it is locked to the edge of the spline hole W3 and cannot be fitted.

From this state, the cylinder 5 provided in the drive section 59
When the drive rod 47 is pushed through the pusher 58 attached to the sleeve 5 and moved to the position shown in chain lines in FIG. 2, the movable sleeve 27 is rotated against the elastic force of the spring 45. .
Then, the clutch outer W is also rotated at the same time by the positioning pin 19 provided on the support frame 11 which rotates together with the movable sleeve 27. At this time, since the amount of rotation of the movable sleeve 27 is set by the stopper bolts 41a and 41b to be slightly larger than one pitch of the spline groove of the clutch outer W, the phase of the spline hole W3 of the clutch outer W changes in the process of the rotation. The phase of the spline portion S2 of the clutch shaft S will definitely match, and the moment the phases match, the clutch outer W
is lowered by its own weight, and the spline hole W3 fits into the spline portion S2. Incidentally, during the above rotation, the lower rod 34a and the roller 29 supported by the movable sleeve 27 slide relative to the pressing portions of the saucer 35 and arm 31 supported by the fixed base 2, and are movable. Rotation of the sleeve 27 is allowed.

When the clutch outer W is lowered and assembled to the clutch shaft S, the lower and upper rods 3 are moved in conjunction with the pressing member 23 that lowers together with the clutch outer W.
4a and 34b are also lowered, and a detector (not shown) attached to their upper ends is activated. Then, the nut runner 51 attached to the upper base 48 moves the engaging/disengaging portion 5a.
The upper and lower tightening shafts 5, 7 are driven to rotate through the clutch shaft, and the fixing nut N held in the lower end socket 7a is screwed into the threaded portion S1 of the clutch shaft S to complete the assembly.

Although the embodiments of the workpiece assembling device according to the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and does not deviate from the present invention described in the scope of the utility model registration claims. , it is possible to make various minor design changes.

For example, instead of opening and closing the gripping claws 14 using the cylinder 49, it is also possible to attach a solenoid to each gripping claw 14 and electrically opening and closing the gripping claws 14.
Also, the nut holding member 9 can be attached using the magnet 9b.
Instead of holding the fixing nut N in place, it is also possible to use air pressure or frictional force to hold the fixing nut N. It should be noted that the workpiece is not limited to the clutch outer, and it is clear that any workpiece having a spline hole in the center can be applied.

C. Effects of the invention According to the workpiece assembling device of the present invention described above, after the boss portion of the workpiece is inserted into the shaft member by the gripping claw, the boss portion of the workpiece is engaged with the opening of the workpiece in a state in which the gripping member is released from the gripping member. Since the workpiece is rotated by the positioning pin, no load other than the weight of the workpiece acts on the spline hole of the workpiece and the spline portion of the shaft member. Therefore, the splines can be phased without galling or damage, and the spline hole of the workpiece and the spline portion of the shaft member can be smoothly fitted.

[Brief explanation of drawings]

FIG. 1 is an overall front view of a workpiece assembly device according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional plan view thereof,
Figure 3 is a bottom view as seen from the line in Figure 1, and Figure 4 is a bottom view of Figure 1.
Fig. 5 is a view taken along the line in Fig. 2 showing the work rotation mechanism, Fig. 6 is a view taken in the line shown in Fig. 2, and Fig. 7 shows the upper part of the assembly head. FIG. 8 is a partially cutaway plan view, and FIGS. 9 and 10 are explanatory diagrams of the operation. W...Clutch outer (work), W1...Opening, W2...Boss part, W3...Spline hole,
S,...Clutch shaft (shaft member), S1...Threaded part,
S2...Spline part, N...Fixing nut, 5,
7... Tightening shaft, 7a... Socket, 14... Gripping claw, 19... Positioning pin.

Claims (1)

[Claims for Utility Model Registration] A spline hole W3 formed in a boss portion W2 of a workpiece W is fitted into a spline portion S2 formed in a shaft member S held vertically, and a spline hole W3 formed in the end portion of the shaft member S is fitted. A workpiece assembly device for tightening a fixing nut N into a threaded portion S1; the workpiece W is detachably gripped and moved, and the boss portion W2 of the workpiece W is inserted into a shaft member S vertically held at a predetermined position. The gripping claw 14 engages with the opening W1 formed in the workpiece W from above to rotate the workpiece W around the shaft member S, thereby adjusting the phase between the spline hole W3 of the boss portion W2 and the spline portion S2 of the shaft member S. a positioning pin 19 for matching and fitting, and a tightening shaft 5 having a socket 7a at the lower end facing the threaded portion S1 of the shaft member S, and tightening the fixing nut N held by this socket 7a into the threaded portion S1. ,7
A workpiece assembly device comprising: