JPH035933B2 - - 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) In Japanese Patent Application No. 60-232346, the applicant of the present application previously arranged a movable base on an assembly station and fixed a cylinder block into which a piston with connecting rod was inserted on the assembly station. Then, the crankshaft is elastically supported on the movable base, and the connecting rod cap is set, and the movable base is advanced toward the skirt portion of the cylinder block in the axial direction of the cylinder bore, and is attached to the large end of the connecting rod. abut the pin part of the crankshaft,
A method for assembling a crankshaft has been proposed in which the large end connecting rod bolt is inserted into the bolt hole of the connecting rod cap and a nut is tightened thereto.

(Problems to be Solved by the Invention) By the way, when the movable base is moved forward and the pin portion of the crankshaft comes into contact with the large end of the connecting rod, the crankshaft is elastically supported by the movable base. Because of this, the pin part may not contact the big end part in a parallel state with the piston pin, but may contact the piston pin at an angle.In this state, insert the connecting rod bolt into the bolt hole of the connecting rod cap. If the nut is fully tightened, the metal at the big end may be damaged or the connecting rod and connecting rod cap may not be tightened to the specified binding pressure, and the crankshaft may not be elastically supported as described above. Because of this, the crankshaft cannot receive enough reaction force when tightening the nut, which may cause the crankshaft to move and cause damage to the metal due to prying.

Also, move the movable table forward to bring the journal part of the crankshaft into contact with the shaft support of the cylinder block, and in this state, bring the pin part into contact with the large end of the conrod, and insert the conrod bolt into the root hole of the conrod cap. It is conceivable to insert the cylinder block into the cylinder block and fully tighten the nut, but in this case, when the movable table is moved forward, the reaction force due to the sliding resistance of the piston inserted in the cylinder block may cause the crankshaft to tilt or move in the axial direction. This can cause the pin to tilt relative to the large end of the conrod, damaging the metal at the large end, or even cause the crankshaft to shift position, causing the journal to not align correctly with the shaft support of the cylinder block. There is a risk that they will not come into contact.

An object of the present invention is to provide an assembly method that solves these problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention arranges a movable base on an assembly station, and also fixes a cylinder block into which a piston with connecting rod is inserted on the assembly station. Then, the crankshaft is elastically supported on the movable base, and the conrod cap is set, and the movable base is advanced toward the skirt portion of the cylinder block along the axial direction of the cylinder bore, and the large end of the conrod is In the crankshaft assembly method, the pin portion of the crankshaft is brought into contact with the movable rod cap, the conrod bolt at the large end is inserted into the bolt hole of the conrod cap, and a nut is tightened thereon. Move the table forward, first bring the pin part into contact with the large end, insert the connecting rod bolt into the bolt hole and temporarily tighten the nut, and then move the movable table further forward. The crankshaft is characterized in that the journal portion of the crankshaft is brought into contact with the shaft support of the cylinder block, and the nut is fully tightened in this state.

(Operation) Move the movable table forward, first bring the pin of the crankshaft into contact with the large end of the connecting rod, insert the connecting rod bolt into the bolt hole of the connecting rod cap, and temporarily tighten the nut therein. Even if the pin part comes into contact with the large end at an angle, the connecting rod and the connecting rod cap are temporarily fastened together, so that the metal will not be damaged.

In addition, since the nut is only temporarily tightened, the reaction force when tightening the nut is small, so even if the crankshaft is elastically supported on the movable table, the crankshaft will not move due to the reaction force and will not cause prying or the like on the big end. Does not occur.

In addition, since final tightening is performed with the journal part of the crankshaft in contact with the shaft support of the cylinder block, the nut is tightened with the pin part of the crankshaft parallel to the piston pin against the large end of the connecting rod. Therefore, the connecting rod and the connecting rod cap can be tightened to a specified bonding pressure without damaging the metal.

Moreover, since the crankshaft is in contact with the cylinder block at the journal part, the reaction force when fully tightening the nut can be received by the cylinder block, and therefore the crankshaft will not move due to the reaction force. There will be no twisting or twisting at the large end.

Furthermore, since the connecting rod and the connecting rod cap are temporarily fastened together, the tilting and axial movement of the crankshaft that occurs when the movable base moves forward until the journal part contacts the shaft support of the cylinder block is restricted. Therefore, the metal at the big end will not be damaged, and the crankshaft will not be displaced.

(Example) In the illustrated example, connecting rod B is installed in each cylinder bore of cylinder block A of an in-line four-cylinder engine.
Insert the piston C with the piston C, place it on the assembly station with the cylinder head mounting surface facing upward, and bring each pin part P of the crankshaft D into contact with the big end of each connecting rod B, A connecting rod bolt F at each large end is inserted into the bolt hole of each connecting rod cap E, and a nut is tightened thereon.
2 is a roller conveyor that conveys the cylinder block A, 2 is a machine frame placed at the assembly station, and 3 is a roller conveyor that conveys cylinder block A.
4 indicates a movable table provided on the lower side of the machine frame 2, and the set table 3 is slidably mounted on a rail 5 vertically disposed on the machine frame 2. The cylinder block A conveyed by the roller conveyor 1 is supported on the work receiver 7 by the raising of the set table 3, and is slightly lifted from the conveyor 1. The movable base 4 is slidably attached to a rail 8 vertically disposed on the machine frame 2, and the screw rod 9 provided on the machine frame 2 A motor 10 which is screwed into a nut sleeve 4a of the movable base 4 and rotates the screw rod 9 forward and backward causes the movable base 4 to move forward and backward in the axial direction of the cylinder bore of the cylinder block A on the set base 3, that is, in the vertical direction. I did it like that.

Then, the crankshaft D is elastically supported on the movable base 4, and the stove cap E is also supported.
, move the movable base 4 forward or raise it toward the skirt portion of the cylinder block A on the set base 3, and first bring the pin portion P of the crankshaft D into contact with the large end of the connecting rod B. The large end connecting rod bolt F is inserted into the bolt hole of the connecting rod cap E, and a nut is temporarily tightened therein, and then the movable base 4 is further raised to attach the crankshaft to the shaft support of the cylinder block. The journal portion J of D was brought into contact with the nut, and in this state, the nut was fully tightened.

More specifically, as shown in FIG.
A plurality of positioning pins 11 are provided, and these positioning pins 11 are protruded to position and hold the setting jig 13 on the movable base 4, which is introduced via a conveyor 12 disposed on the upper side of the movable base 4 and on the side thereof. As shown in FIGS. 4 to 6, the setting jig 13 has a chamfer G on one end of the crankshaft D fitted on the upper side of the pallet 14 to prevent the crankshaft D from rotating. A support 15 for supporting the crankshaft and a support 16 for supporting the other end are biased upward by respective springs 17. A plurality of sockets 18 are provided on the pallet 14, each of which is biased upwardly by a spring 19, as shown in FIG. A pin 20 is provided at the tip of each socket 18 to protrude downwardly against a spring 21, and each pin 20 is inserted into the bolt hole of the stove cap E to position and hold it at the tip of each socket 18. It was free. Therefore, the crankshaft D and the stove cap E can be set on the movable base 4 via the setting jig 13. Further, a mounting plate 22 is provided directly below the movable table 4 so as to be movable up and down along a rail (not shown) vertically disposed on the machine frame 2, and a setting jig 13 is attached to the mounting plate 22.
A plurality of nut runners 23 each having a concave portion 23a at the tip that can be freely engaged and detached from the drive shaft 18a of the socket 18 are vertically disposed, and a piston rod of a docking cylinder 24 attached to the mounting plate 22 is connected to the movable base 4. The mounting plate 22 is given the ability to move up and down relative to the movable base 4 by the operation of the docking 24, and to move in conjunction with the up and down movement of the movable base 4.

In the drawing, reference numeral 25 indicates four positioning tools that move laterally toward and away from cylinder block A on the setting table 4, and these positioning tools 25 are connected to cylinders 26, 26.
The guide groove 25a at the tip of each positioning tool 25 is moved forward toward the cylinder block A side by the operation of
The large end of each connecting rod B hanging down from the cylinder block A is inserted into the cylinder block A and positioned in the direction of the crankshaft.

Reference numerals 27 and 27 indicate four bolt holders that advance and retreat in the lateral direction toward the cylinder block A, and each bolt holder 27 moves forward toward the cylinder block A side by operating the cylinders 28 and 28 in the forward direction. The head of the connecting rod bolt F of each connecting rod B is covered from above, and this is connected to each connecting rod cap E.
Hold it down so that it does not fall out when inserting it into the bolt hole.

29 is a conveyor for discharging the setting jig 13 provided on the movable table 4, and 30 is a crankshaft D.
2 shows a positioning member provided on a setting jig 13 that is inserted into the journal portion J to position the shaft D in the axial direction.

Next, the operation of the embodiment will be explained.

First, the cylinder block A in which the piston C with connecting rod B is inserted is conveyed by the roller conveyor 1 and positioned on the setting table 3 of the assembly station, and then each positioning tool 25 is attached to the cylinder 2.
The cylinder block is moved forward toward the A side by the operation of the positioning tools 6 and 26. According to this, each positioning tool 25
The large end of each conrod B is inserted into the guide groove 25a of the piston pin, and the conrod B is positioned in the crankshaft direction so that it is located in the center of the piston pin. The centerline of conrod B is aligned with the axis of each cylinder bore.

Next, each bolt retainer 27 is attached to the cylinders 28, 28.
As a result of this operation, the cylinder block A is moved forward and each positioning tool 25 is moved backward.

Also, the setting jig 13 in which the crankshaft D and the stove cap E were each set was placed on the upper side of the movable table 4, and this was positioned on the movable table 4, thereby completing the positioning of each conrod B as described above. After that, the motor 10 is operated to advance or raise the movable base 4 toward the skirt portion in the axial direction of the cylinder bore, and first, each pin portion P of the crankshaft D is brought into contact with the large end of each conrod B, and each conrod is Insert the connecting rod bolts F at each large end into the bolt holes of the cap E, and then insert the docking cylinder 2.
4 to raise the mounting plate 22 with respect to the movable base 4, connect the driving part 18a of each socket 18 to the recess 23a of each nut runner 23, and operate each nut runner 23 to connect each connecting rod bolt F to each Temporarily tighten the nut.

Here, even if each pin part P comes into contact with each large end in an inclined manner, each cooking rod B and cooking rod cap E
Because it is a temporary tightening, it will not damage the metal, and the reaction force that acts on the crankshaft D when tightening the nut is small, so the crankshaft D will not move and the big end will not be pried, etc. does not occur.

Next, after leaving behind each bolt holder 27, the motor 10 is activated to further raise the movable base 4, and as shown in FIG. 9, each journal portion of the crankshaft D is brought into contact with each shaft support of the cylinder block A. In this state, each nut runner 23 is operated to fully tighten each nut.

According to this, each journal part is brought into contact with each shaft support, and the pin part P of the crankshaft D is in a state parallel to the piston pin. Therefore, since it is fully tightened in this state, it can be connected to the connecting rod B without damaging the metal. The stove cap is tightened to the specified bonding pressure.

Moreover, since the reaction force when fully tightening the nut is received by the cylinder block A, the crankshaft D does not move.

Thereafter, the movable table 4 is lowered, the setting jig 13 is delivered by the conveyor 29, 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, it is possible to assemble the cooking rod and the crankshaft without damaging the metal at the large end of the cooking rod, and the cooking rod and the cooking rod cap can be connected in a specified manner. It has the effect of being tightened by pressure.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an assembling device for assembling a crankshaft to a connecting rod by the method of the present invention, Fig. 2 is a view taken along the - line, Fig. 3 is an enlarged view of the main parts, and Fig. 4 is A front view of the setting jig, FIG. 5 is a plan view thereof, FIG. 6 is a sectional view taken along the line -- in FIG. 4, FIG. 7 is a front view of the positioning tool and bolt retainer, and FIG. 8 is a plan view thereof. FIG. 9 is an explanatory diagram of the operation. A...Cylinder block, B...Conn rod,
C... Piston, D... Crankshaft, E...
...Conrod cap, F...Conrod bolt, P...Crankshaft pin section, J...Crankshaft journal section, 4...Movable base.

Claims (1)

[Claims] 1 Place a movable base on the assembly station, and place a cylinder block into which a piston with a connecting rod is installed on the assembly station, elastically support the crankshaft on the movable base, and set the conrod cap. Then, move the movable table forward toward the skirt of the cylinder block along the axial direction of the cylinder bore, bring the pin of the crankshaft into contact with the large end of the conrod, and open the bolt hole of the conrod cap. In the crankshaft assembly method in which a conrod bolt at the large end is inserted and a nut is tightened thereon, the movable base is moved forward and the pin portion is first brought into contact with the large end; Insert the connecting rod bolt into the bolt hole and temporarily tighten the nut, and then move the movable table further forward to bring the journal part of the crankshaft into contact with the shaft support of the cylinder block. A crankshaft assembling method characterized in that the nut is fully tightened with.