JPH035932B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates primarily to an assembly device for automatically assembling a crankshaft to a conrod of a vehicle engine.

(Prior Art) The applicant of the present application previously proposed in Japanese Patent Application No. 60-232346 a cylinder block in which a piston with a connecting rod is inserted into the upper side of the machine frame, and a setting table that can be freely positioned with the connecting rod hanging down. A lifting platform is provided below the machine frame to raise and lower a setting jig that is placed under the setting table, and a crankshaft and a stove cap can be freely set on the setting jig. As the tool rises, the pin of the crankshaft comes into contact with the large end of the connecting rod, and the connecting rod bolt at the large end is inserted into the bolt hole of the connecting rod cap, and the nut is inserted into the setting jig. We proposed a crankshaft assembly device that tightens using an on-board nut runner.

(Problem to be Solved by the Invention) By the way, the piston and connecting rod are assembled so that there is a relatively large play in the axial direction of the piston pin. Even if the connecting rod is inserted in line with the axis of the piston pin, the connecting rod may shift in the axial direction of the piston pin when transporting the cylinder block to the crankshaft assembly station. When the pin portion of the crankshaft is brought into contact with the large end of the cooking rod, there is a risk of damaging the metal of the large end.

In addition, mounting a nut runner on the setting jig tends to make the setting jig complicated and large, and if multiple setting jigs are prepared and fed in alternately, it is necessary to provide a nut runner for each setting jig. There is a problem that the entire device becomes expensive. An object of the present invention is to provide a device that solves these problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a cylinder block with a connecting rod attached to the upper side of the machine frame, and a setting table that can freely position the cylinder block with the connecting rod hanging down. A lifting platform is provided below the machine frame to raise and lower a setting jig that is placed under the setting table, and a crankshaft and a stove cap can be freely set on the setting jig. By raising the tool, the pin part of the crankshaft is brought into contact with the large end of the connecting rod, and the connecting rod bolt of the large end is inserted into the bolt hole of the connecting rod cap, and a nut is tightened thereon. In the crankshaft assembly device, the machine frame is provided with positioning means for moving the connecting rod in the axial direction of the piston pin so that the center line in the hanging direction of the connecting rod coincides with the axis of the piston, and A socket into which a nut can be set at the tip of the tool, and a nut runner which is connected to the lifting platform and can be moved up and down in conjunction therewith, and which can be connected to the socket via a mounting plate that can be moved up and down with respect to the lifting table. It is characterized by having been established.

(Operation) The connecting rod is moved to its axial center with respect to the piston pin by the positioning means, and the posture of the connecting rod is fixed by its own weight, and the center line of the connecting rod is aligned with the axis of the piston. The pin part of the crankshaft can be accurately brought into contact with the large end of the crankshaft without damaging the metal.

In addition, the setting jig is equipped with only a socket at its tip into which a nut can be set, and a nut runner that can be freely connected to the socket is mounted on the lifting platform that raises and lowers the setting jig, so the setting jig is simplified. It can be obtained relatively compactly, and when a plurality of setting jigs are prepared, it is sufficient to prepare a nut runner for one setting jig, and the device can be obtained at a relatively low cost.

(Example) The drawing shows a piston C with connecting rod B inserted in advance into each cylinder bore of cylinder block A of an in-line 4-cylinder engine, transported to a predetermined assembly station, and then assembled with a crankshaft D. 1 and 2, 1 is a roller conveyor that conveys the cylinder block A in the front and back direction, 2 is a machine frame provided at the assembly station, and 3 is the machine frame 2. A setting table 4 is provided on the upper side, and a lifting table 4 is provided on the lower side of the machine frame 2.
The setting table 3 is slidably attached to a rail 5 vertically disposed on the machine frame 2, and can be moved up and down by the operation of a cylinder 6.
As the cylinder block A is raised, the cylinder block A conveyed by the roller conveyor 1 is supported on the workpiece receiver 7, and it is slightly lifted from the conveyor 1 to each connecting rod B.
The lifting platform 4 is slidably attached to a rail 8 vertically installed on the machine frame 2, and a screw rod 9 provided on the machine frame 2 is connected to the lifting platform 4. The lifting table 4 is screwed into a nut sleeve 4a, and a motor 10 that rotationally drives the screw rod 9 allows the lifting table 4 to be moved up and down.

Then, the setting jig 11 placed under the setting table 3 is moved up and down by the movement of the lifting table 4, and the crankshaft D and stove cap E are set on the setting jig 11. By raising the tool 11, the pin portion G of the crankshaft D is brought into contact with the large end F of the connecting rod B, and the connecting rod bolt H of the large end F is inserted into the bolt hole of the connecting rod cap E. I tightened the nut I.

More specifically, the setting jig 11 includes a sixth
As shown in Figs. 8 to 8, there is a support 13 on the upper side of the pallet 12 that fits into the chamfered part K of one end of the crankshaft D to prevent and support the crankshaft D, and a support that supports the other end. A plurality of sockets 16 are provided in which the crankshaft D can be freely set in the supports 13 and 14, and a nut I can be freely set in the pallet 12. As shown clearly in FIG.
8a so that it can be freely retracted downward, and connect the connecting rod cap E to each bolt hole of the cap E.
is inserted into the tip of each socket 16 so that it can be freely positioned and held.

Moreover, as shown in FIG. 3, on the upper side of the lifting platform 4,
A plurality of positioning pins 19 are provided upwardly and retractably, and these positioning pins 19 are made to protrude, so that the pallet 1 of the setting jig 11 is loaded onto the lifting table 4 from the roller conveyor 20 disposed on the side thereof.
The tip of each pin 19 was inserted into the through hole 12a of No. 2, so that the setting jig 11 could be positioned.

Further, a mounting plate 21 is provided directly below the lifting table 4 so as to be movable up and down along a rail (not shown) vertically disposed on the machine frame 2, and a drive shaft for each socket 16 of the setting jig 11 is attached to the mounting plate 21. A plurality of nut runners 22 each having a recessed portion 22a at the tip that can be freely engaged and detached from the nut runner 16a are vertically disposed, and a piston rod of a docking cylinder 23 fixed to the mounting plate 21 is attached to the lifting platform 4.
The mounting plate 21 is allowed to move up and down with respect to the elevating table 4 by the operation of the cylinder 23, and to move in conjunction with the elevating and lowering movement of the elevating table 4.

In the illustrated example, as shown in FIGS. 4 and 5, the mounting plate 21 is provided with a pair of first sliders 24 that are fixed to the mounting plate 21 and are movable laterally along a longitudinal rail 24a. A plurality of second sliders 25 are inserted into a longitudinally elongated guide bar 25a fixed to each of the sliders 24, each of the nut runners 22 is attached to each of the second sliders 25, and each of the first and second sliders is attached to each of the second sliders 25. 24 and 25, and a guide pin 26 is provided upright on each of the second sliders 25, so that when the docking cylinder 23 is operated toward the docking side, each of the sockets is moved in the horizontal direction. 16 drive shafts 16a and recesses 22 at the tips of each nut runner 22.
Each guide pin 26 is inserted into the guide hole 11a formed in the setting jig 11 prior to engagement with the drive shaft 16a and the recess 22a, and the drive shaft 16a and the recess 22a are reliably centered. The setting jig 11 can also be used with different setting jigs.

In the drawing, 40 is a setting jig 11 installed on the lifting platform 4.
A delivery conveyor, 27 is a positioning member provided on the setting jig 11 that is inserted into the journal portion of the crankshaft D to position it in the axial direction, and 28 is a stopper that restricts the movement of each nut runner 22 in the horizontal direction. .

Further, positioning means 29 is provided at a side position of the setting table 3 above the machine frame 2, and aligns each connecting rod B hanging down from the cylinder block A set on the setting table 3 with respect to the piston pin. The center of each conrod B in the hanging direction was moved to the center side so that the center of each conrod B in the hanging direction could coincide with the axis of the piston C.

In the illustrated positioning means 29, as shown in FIGS. 9 to 11, a movable frame 30 that moves in the horizontal direction toward the cylinder block A on the setting table 3 is configured to align the size of each connecting rod B. It is equipped with four positioning tools 31 each having a guide groove 31a at the tip for inserting and positioning the end portion F, and moves the movable frame 30 along a rail 32a fixed to the machine frame 2 to the first position.
The first movable frame 32 moves forward and backward with the cylinder 32b.
and a second movable frame 33 that moves forward and backward with respect to the first movable frame 32 with a second cylinder 33a, and each positioning tool 31 is attached to the second movable frame 33 by a crank via each slide bearing 34. Of these four positioning tools 31, both positioning tools 31, 31 shown by W and Y in FIG.
and both positioning tools 31, 31 indicated by X and Z are connected by respective rods 35, and a cylinder 36 is connected to the tail end of the Y positioning tool 31,
The piston rod 36 of the cylinder 36 is attached to the tail end of the piston rod 36 of the cylinder 36.
a, and then attach X and Y to the second movable frame 33.
Stoppers 37, 37 are provided to restrict the movement of both positioning tools 31, 31, and the first cylinder 32
The movement of the first movable frame 32 due to the forward movement of b causes the respective positioning tools 31 to move forward to the vicinity of the large end F of the connecting rod B, and the movement of the second cylinder 33a to the forward side causes the movement of the first movable frame 32. The movement of the second movable frame 33 allows the large ends F to be inserted into the guide grooves 31a, and the operation of the cylinder 36 allows the four positioning tools 31 to be adjusted so that the distance between them is adjusted. The cylinder block A is moved to a relatively wide solid line state and a relatively narrow chain line state to be compatible with two types of cylinder blocks A.

In the drawings, reference numerals 38 and 38 indicate bolt holders that move laterally toward cylinder block A on set table 3. Each bolt holder 38 moves forward toward cylinder block A when cylinder 39 moves forward. , covers the head of the connecting rod bolt H inserted into the large end F of each connecting rod B from above, and presses it so that it does not come off when inserted into the bolt hole of each connecting rod cap E.

Next, to explain the operation of the embodiment, first, the cylinder block A in which the piston C with connecting rod B is inserted is set on the setting table 3, and then each positioning tool 31 of the positioning means 29 is set on the first and second cylinders. 32b, 33a are actuated to advance the cylinder block A side. According to this, the large end F of each connecting rod B is inserted into the guide groove 31a at the tip of each positioning tool 31, and the connecting rod B is moved in the hanging direction. The center line is aligned with the axis of each piston C.

Next, attach each bolt retainer 38 to cylinder block A.
While moving forward to the side, each positioning tool 31 is retreated.

Further, the setting jig 11 in which the crankshaft D, stove cap E, and nut I are each set is placed under the setting table 3, and then the positioning pins 19 on the lifting table 4 are protruded, and the setting jig 11 is placed on the lifting table 4. After the above-mentioned positioning of each connecting rod B is completed, the motor 10 is operated to raise the lifting platform 4, and each pin portion G of the crankshaft D is attached to the large end F of each connecting rod B. At the same time, each conrod bolt H of each large end F is inserted into the bolt hole of each conduit cap E, and then the docking cylinder 23 is operated to raise the mounting plate 21 relative to the lifting platform 4. According to this, the recess 22a of the nut runner 22 on the mounting plate 21
The drive shaft 16 of each socket 16 of the setting jig 11
a is connected.

Next, by operating each nut runner 22, the nut I at the tip of each socket 16 is tightened onto each conrod bolt H.

After that, the elevator platform 4 is lowered, and the positioning pin 19 is
is retracted and the setting jig 11 is delivered by the conveyor 40, and the cylinder block A on the setting table 3 is delivered by the roller conveyor 1 to complete the assembly work.

(Effects of the Invention) As described above, according to the present invention, the crankshaft can be reliably assembled to the large end of the cooking rod without damaging each metal, and the socket which can freely set the nut in the setting jig can be used. Since the nut runner and the nut runner are arranged separately on the lifting platform, the setting jig can be made simple and relatively small.Furthermore, when multiple setting jigs are prepared, the nut runner is sufficient for one setting jig, and the device can be obtained at a low cost. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the entire device of the present invention, FIG. 2 is a view taken along the - line, FIG. 3 is an enlarged front view of the main parts, FIG. 4 is a view taken along the - line, and FIG. 6 is a side view of the setting jig, FIG. 7 is a plan view thereof, and FIG. 8 is a cross-sectional view of the setting jig.
A cutaway sectional view, FIG. 9 is a front view of the alignment means,
FIG. 10 is a plan view thereof, and FIG. 11 is a side view thereof. 2... Machine frame, 3... Setting table, 4... Lifting table,
11...Set jig, 16...Socket, 21...
...Mounting plate, 22...Nut runner, 29...Positioning means, A...Cylinder block, B...Conrod, C...Piston, D...Crankshaft, E...Conrod cap, F...Conrod Big end, G... Crankshaft pin part,
H...conrod bolt, I...nut.

Claims (1)

[Claims] 1. A setting table that can freely position a cylinder block with a piston with a connecting rod inserted on the upper side of the machine frame with the connecting rod hanging down, and a setting table that is inserted into the lower side of the setting table on the lower side of the machine frame. A lifting platform for raising and lowering the equipment is provided, a crankshaft and a stove cap can be freely set on the setting jig, and the pin portion of the crankshaft is brought into contact with the large end of the stove as the setting jig is raised. In the crankshaft assembly device, the conrod bolt at the large end is inserted into the bolt hole of the conrod cap and a nut is tightened thereon. A positioning means is provided for moving the connecting rod in the axial direction of the piston pin so that the connecting rod is aligned with the axis of the piston, and the setting jig is further provided with a socket at the tip of which a nut can be freely set, and the elevating table is interlocked with this. 1. A crankshaft assembly device comprising: a nut runner which is movable up and down, and which is connectable to the socket via a mounting plate which is movable up and down with respect to the elevating table.