JPH0715703Y2 - Engine bearing cap assembly device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an engine bearing cap assembling device, and in particular, a bearing cap is installed from above while supporting a connecting rod large end of a cylinder block in an inverted posture from above. Regarding what to attach.

[Prior art]

In an engine assembly line such as an automobile factory, a piston assembly consisting of a piston and a connecting rod is inserted into a cylinder block in an inverted posture, and a piston pressing tool is inserted into the cylinder bore from below with the crankshaft assembled. A bearing cap assembling technique is adopted in which the piston cap is pushed up to the crankshaft side while the bearing cap is assembled from above from the large end of the connecting rod (see Japanese Patent Publication No. 55-8661).

[Problems to be solved by the device]

In the above-mentioned conventional bearing cap assembling device, it is necessary to provide a piston pushing tool that pushes up the piston by inserting it into the cylinder bore of the cylinder block from below.
Since the lifting stroke of this piston pressing tool becomes very large, a pit is deeply recessed in the transfer line of the cylinder block and a piston pressing tool with a large lifting stroke is placed there, or the transfer line of the cylinder block is set on the floor. Since it has to be installed at a position considerably higher than the level, there is a problem that the bearing cap assembling apparatus becomes large as a whole and the equipment cost becomes high.

[Means for Solving the Problems]

A bearing cap assembling device for an engine according to the present invention has a piston cap composed of a piston and a connecting rod and a crankshaft assembled, and a bearing cap is attached to a large end of a connecting rod of a cylinder block conveyed to a predetermined position in an inverted posture. An assembling device for assembling, wherein a connecting rod in a state of bottom dead center is supported by a pair of lift arms from above the cylinder block and is pulled up to the crankshaft side, and the connecting rod is pulled up by the pulling means. In this state, the bearing cap for the connecting rod held by the chuck mechanism is attached to the large end of the connecting rod.

[Action]

In the apparatus for assembling the bearing cap of the engine according to the present invention, the pulling-up means is configured to support the connecting rod in the bottom dead center state from above the cylinder block with a pair of lift arms and pull it up to the crankshaft side. Therefore, the pulling means can be provided above the cylinder block by also using a portal frame for the assembling means for assembling the bearing cap, and the lifting stroke of the pulling means may be relatively small. The assembling apparatus can be downsized as a whole as compared with the case where a large means for pushing up the piston assembly from below the cylinder block is adopted.

[Effect of device]

According to the bearing cap assembling device for an engine according to the present invention, as described above, the connecting rod in the bottom dead center state is supported by the pair of lift arms from above the cylinder block and pulled up to the crankshaft side. Means and an assembling means for assembling the connecting rod bearing cap held by the chuck mechanism to the large end of the connecting rod while the connecting rod is being pulled up by the pulling means. Since it can be arranged, it is advantageous in terms of equipment cost. Since the connecting rod in the bottom dead center state that is located at the uppermost position is pulled up, the pulling stroke is also small, and the pair of lift arms is small and simple. Therefore, the pulling means can be made small and simple, and the supporting member of the pulling means can also serve as a gate-shaped frame for the assembling means. It, can be reduced equipment costs and size and simplified as a whole with the bearing cap assembly device, effects etc. are obtained.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, in an assembly line for assembling a vertical in-line four-cylinder engine for an automobile, the cylinder block CB is conveyed while being mounted and supported on a pallet P in an inverted posture and with a crankshaft assembled. The present invention relates to a bearing cap assembling device for assembling a bearing cap 3 to a connecting rod large end 2a of an assembly of a piston 1 and a connecting rod 2 assembled in a CB.

As shown in FIGS. 1 to 3, the pallet transfer line 5 for transferring the pallet P on which the cylinder block CB is placed transfers the pallet P from the front to the rear as indicated by an arrow A. On the pallet P, a cylinder block CB is placed and supported in an inverted posture with the crankshaft 4 facing forward and backward.
A piston assembly is attached to each cylinder of the cylinder block CB, and the piston assembly is held by the frictional force between the piston ring and the cylinder bore.

At the bearing cap assembling station S, cap assembly is performed in which four bearing caps 3 supplied from the outside and aligned on the turntable 6 are gripped by the four sets of chuck mechanisms 60 and 60A and are simultaneously assembled to the cylinder block CB. Unit 50,
A lift unit 20 for pulling up and holding the connecting rod large ends 2a of the first and fourth cylinders on the bottom dead center side to the crankshaft 4 side when the cap 3 is assembled, a nut feeder 7, and
A swivel type nut loader 8 receives two nuts 3a from the nut feeder 7 and sets the nuts 3a on the cap 3, and four sets of two pairs of caps 3 supplied from a cap feeder (not shown) and aligned. A rotary table 6 and the like are provided.

The cap assembly unit 50 and the lift unit 20 are
The cap assembly unit 50 is mounted on the pair of front and rear gate frames 9 arranged in the left and right direction across the pallet transport line 5, and the cap assembly unit 50 reciprocates in the left and right directions on the pair of front and rear beams 9a of the gate frame 9. The lift unit 20 is provided above the pallet transport line 5 so as to be vertically immovable in the pair of beams 9a.

First, the lift unit 20 will be described.

As shown in FIG. 1, FIG. 2, FIG. 4 to FIG.
A pair of horizontal front and rear horizontal base plates 21 are vertically suspended by column members 22 at a predetermined height below the pair of beams 9a.
A pair of front and rear base plates 21 are provided below which a square frame 23 is arranged at a predetermined interval.
Reference numeral 23 denotes a horizontal support plate 24 having the same shape as the base plate 21 located below each base plate 21, and a vertical end plate 25 for connecting the left and right ends of the pair of front and rear support plates 24, respectively. An end plate 25 fixed to the lower surface of the support plate 24 and a horizontal connecting plate 26 connecting the center portions of the lower ends of the pair of left and right end plates 25.

In order to drive the frame 23 up and down, the rod 27a of the cylinder 27 attached to the inverted plate at the center of each base plate 21 penetrates the base plate 21 and is fixed to the center of each support plate 24. Guide rods 29 are vertically inserted through guide sleeves 28 fixed to the base plate 21 on both the left and right sides, and the lower ends of the guide rods 29 are fixed to a support plate 24 via sleeve members 30.

Inside the frame 23, a lift arm mechanism 32 having a pair of lift arms 31 for supporting the connecting rod large ends 2a corresponding to the first and fourth cylinders from both sides is arranged and attached to the connecting plate 26. Has been.

Explaining the lift arm mechanism 32, a top plate 33 having a substantially square shape in plan view is provided, and a cylinder is provided on the lower surface of the connecting plate 26 at a position corresponding to the center part of the left end and the center part of the right end.
34 is attached vertically, the rod 34a of each cylinder 34 is inserted through the connecting plate 26, and the upper end of the rod 34a is engaged with the engaging member 35 on the lower surface of the top plate 33 so as not to move up and down. A guide sleeve 36 is supported by a pair of cylinders 34, and a guide sleeve 36 is vertically attached to the connecting plate 26 on both front and rear sides of each cylinder 34. A guide rod 37 is inserted through each guide sleeve 36 so as to be vertically movable. The upper end is connected to the top plate 33.

Therefore, the top plate 33 is connected to the connecting plate 26 by the pair of left and right cylinders 34.
It can be driven up and down.

Reference numeral 38 is a reference gold for contacting the reference surface f of the cylinder block CB to set the height position of the connecting plate 26, and the four reference gold 38 are fixed to the lower surface of the connecting plate 26. .

The top plate in the front-rear position corresponding to the first and fourth cylinders
33 is a cap assembly unit 50 chuck mechanism 60 / 60A
An opening 39 is formed to allow passage of the cap 3 held by the top plate 33, and a large opening 40 common to both is formed in the top plate 33 at the front-rear position corresponding to the second and third cylinders. Slide blocks 41 are attached to the lower surface of the top plate 33 on the left and right sides of the opening 39 in the left and right directions, respectively.
A pair of left and right lift arms 31 are attached to these slide blocks 41.
Is vertically movably installed. The lift arm 31 is composed of a support portion 31a which is engaged with the slide block 41 so as not to move up and down and is movable in the left and right directions, and an arm 31b which extends downward from an inner end portion of the support portion 31a, and a lower end of the arm 31b. A hook portion 31c capable of supporting the downward step 2b of the connecting rod large end 2a is formed in the portion.

After lowering the left and right lift arms 31 in an open state, these lift arms 31 are moved to the mutual approach side and the hook portions 31
In order to engage c with the step portion 2b, the support portion 3 of each lift arm 31
A cylinder 42 is installed laterally outside 1a.
42 is attached to a bracket 43 which is vertically installed on the top plate 33, and the rod of the cylinder 42 is inserted through the bracket 43 to support the support portion 31a.
The cylinder 42 allows the lift arm 31 to switch its position between a position where the hook portion 31c of the lift arm 31 is opened laterally from the large end 2a of the connecting rod and a position where the hook portion 31c engages with the stepped portion 2b. ing.

Therefore, after the cylinder block CB placed on the pallet P and conveyed is stopped at a predetermined position below the lift unit 20, the rod 27a of the cylinder 27 is extended and the left and right lift arms 31 are opened to extend the frame. 23 is lowered, the reference metal 38 of the connecting plate 26 is brought into contact with the reference surface f of the cylinder block CB, and then the rod of the cylinder 42 is extended to move the left and right lift arms 31 to the relative approach side, and the left and right hook portions. When the rods 34a of the cylinder 34 are extended after the rods 31a are opposed to each other near the bottom of the stepped portion 2b of the large connecting rod end 2a, the lift arm 31 is lifted via the top plate 33 to hook the left and right lift arms 31. The connecting rod large end 2a can be pressed toward the pull-up side by 31c and held in close contact with the crankshaft 4. In this state, the four caps 3 conveyed by the cap assembling unit 50 can be simultaneously assembled to the connecting rod large end 2a through the openings 39 and 40.

Next, the cap assembly unit 50 will be described.

As shown in FIG. 1 to FIG. 3, FIG. 8 to FIG.
A movable base plate 51 is erected over a pair of beams 9a of the pair of gate-shaped frames 9, and the movable base plate 51 is supported and guided by a guide rail 52 on the beam 9a. A cylinder 53 attached to the rear side can transfer and drive a predetermined stroke in the left-right direction. An elevating plate is provided below the movable base plate 51 and between the front and rear beams 9a.
The guide rods 55, in which 54 are arranged and which are erected from the four corners of the elevating plate 54, are inserted into the guide sleeves 56 of the movable base plate 51, and are vertically attached to the front and rear parts of the central portion of the movable base plate 51. The rod 57a of the cylinder 57 is inserted into the movable base plate 51 and is connected to the elevating plate 54 via a buffer mechanism 58 having a built-in spring.

Chuck mechanisms 60 corresponding to the first and fourth cylinders are vertically provided on the lower surfaces of the front end and the rear end of the lift plate 54.
Rod 59a of cylinder 59 attached upside down at the center of
Extends downward through the lift plate 54, and the mounting plate is
A chuck mechanism 60 corresponding to the second and third cylinders via 61
A is installed vertically.

These four sets of chuck mechanisms 60 and 60A are the rotary table 6
The upper four sets of caps 3 are simultaneously gripped, conveyed onto the cylinder block CB, and assembled to the connecting rod large end 2a of the cylinder block CB, which is configured as follows.

As shown in FIG. 9 and FIG. 10, in the chuck mechanism 60 corresponding to the first and fourth cylinders, a pair of front and rear bracket plates 62 suspended from the elevating plate 54 are horizontally slender horizontally at the lower ends. A guide plate 63 is fixed, a cylinder 64 is vertically erected vertically in the center of the lower surface of the guide plate 63, and a horizontal base member 65 which is long and narrow in the left and right is fixed to the lower end of the cylinder 64.
Also, notch grooves 63a and 65a cut from the outer end side are formed in the upright direction at both left and right ends of the base member 65.

A pair of left and right chuck arms 68 extending vertically includes an upper arm member 66 and a lower arm member 67 fixed to the lower ends thereof.
Each of the upper arm members 66 is disposed so as to be inserted into the notch grooves 63a and 65a of the guide member 63 and the base member 65, and the middle portion of the lower portion thereof is a pivot member 69 extending in the front-rear direction. The upper end parts of the left and right upper arm members 66 are urged toward the chuck release side by a tension coil spring 70.

Further, a tapered surface 71 is formed inside the upper ends of the pair of left and right upper arm members 66 so as to approach the axis of the cylinder 64 as it goes upward, and the operating member 7 is provided at the upper end of the rod 64a of the cylinder 64.
2, the upper arm member 66 is inserted into the vertical cutouts 72a at the left and right ends of the operating member 72, and the upper arm member 66 is disposed in each of the cutouts 72a. The guide roller 72c rotatably movably contacts the tapered surface 71 from the outside, and when the rod 64a of the cylinder 64 is retracted, the operating member 72 is lowered and the chuck arm 68 is opened by the spring 70. When the rod 64a is extended, the operating member 72 rises and the guide roller 72c pushes the tapered surface 71 outward to drive the chuck arms 68 to close, and the holding portions 67a at the lower ends of the pair of left and right chuck arms 68 are used to cap. The side of 3 can be pressed and held.

When holding the cap 3 with the pair of left and right chuck arms 68, hold the pair of nuts 3a placed on the cap 3 and set the cap 3 on the connecting rod large end 2a of the cylinder block CB. In order to lightly tighten the nut 3a, a holder member 73 is vertically provided on the lower end surface of the base member 65, and air-driven rotary actuators 75 are provided on the left and right sides of the holder member 73 inside the chuck arm 68 via mounting members 74, respectively. Are attached in an upside down inverted manner, and L-shaped socket holding members 76 are attached to the left and right sides of the lower end portion of the holder member 73 via slide mechanisms respectively so as to be vertically movable, and each socket holding member 76 has a nut 3a. A socket 77 fitted externally to the shaft is rotatably mounted vertically, and the socket 77 is guided by a guide cylinder 78.The output shaft 75a of each rotary actuator 75 is connected to a coupling 79 and a coil for torque transmission. It is connected to the socket 77 by a le spring 80. Further, at the lower end of the holder 73, a protrusion 81 is formed which abuts on the central portion of the upper end surface of the cap 3 and regulates the height position of the chuck mechanism 60 with respect to the cap 3 so as to have a predetermined positional relationship.

The chuck mechanism 60A corresponding to the second and third cylinders has basically the same structure as the chuck mechanism 60, but
And when the piston 1 of the fourth cylinder is at the bottom dead center position, the pistons 1 of the second and third cylinders are at the top dead center position. The corresponding chuck mechanism 60A is provided so as to be able to move up and down by a cylinder 59 attached to the elevating plate 54.
It is supported by fixing a guide plate 63 to a mounting plate 61 fixed to the lower end of a. Reference numeral 82 in FIG. 8 is a pair of front and rear guide plates for guiding the two sets of chuck mechanisms 60A attached to the lower end of the rod 59a so as not to swing in the front-rear direction. Although air cylinders are used as the cylinders 27, 34, 42, 53, 57, 59, and 64 in the present embodiment, hydraulic cylinders may be used as needed.

The operation of the bearing cap assembling device described above will be described.

A cap feeder (not shown) conveys the caps 3 with a half-divided metal from the outside and sequentially places them on the rotary table 6 to prepare four sets of caps 3 in line. The nut loader 8 holds a pair of nuts 3 a supplied from the nut feeder 7 and places them on each cap 3 on the right half of the rotary table 6. After the four sets of caps 3 and nuts 3a are prepared in this way, four sets of caps 3 and nuts 3a that can be used for assembly are prepared on the left half of the rotary table 6 by rotating the rotary table 6 by 180 °. To be done.

In this state, the cap assembly unit 50
It is transferred to the rotary table 6 by 53, the rod 59a of the cylinder 59 is retracted to hold the four sets of chuck mechanisms 60 and 60A at the same height, and the rods 64a of the four sets of cylinders 64 are retracted to make the chuck arm. With the cylinder 68 open, the cap assembly unit 50 is lowered by the cylinder 57, the lowering is stopped at the position where each protrusion 81 abuts the upper end of the cap 3, and then the rod 64a of the cylinder 64 is extended. The chuck arm 68 is closed by the
And hold the nut 3a in the socket 77. After that, the cylinder assembly 57 raises the cap assembly unit 50 to a predetermined position, and then the rod 53a of the cylinder 53 is retracted to transfer the cap assembly unit 50 above the cylinder block CB on the pallet P.

In parallel with the chucking and transfer of the cap 3, the lift unit 20 has two sets of lift arms 31 as described above.
The upper ends 2a of the connecting rods of the first and fourth cylinders are pulled upwards, and the connecting rods 2 of the second and third cylinders are attracted upward.
As for the piston 1, the push-up rod of the push-up device equipped on the pallet transfer line 5 is inserted into the pallet P and inserted into the second and third cylinders of the cylinder block CB respectively.
By pushing up, the connecting rod 2 is urged upward, and the cap 3 is ready for assembly.

In this state, cap assembly unit 50 is lift unit
20A and the rod 59a of the cylinder 59 is extended to move the chuck mechanism 60A for the second and third cylinders.
Lower the cylinder by a predetermined stroke, and then
When 57a is extended and the cap assembly unit 50 is lowered, the chuck mechanism 60 / 60A opens the opening 39/40 of the top plate 33.
The caps 3 held by the chuck mechanisms 60 and 60A are placed on the upper ends of the corresponding connecting rod large ends 2a, and the bolts of the connecting rod large ends 2a are inserted into the bolt holes of the cap 3. At this time, the socket holding member 76 moves upward against the elastic force of the spring 80, and the socket 77
The inner nut 3a is located at the upper end of the bolt. Next, the rotary actuator 75 is rotationally driven in the right-hand screw direction to rotate the socket 77 via the spring 80 to lightly tighten the nut 3a with a predetermined torque, and the cap 3 is assembled to the connecting rod large end 2a. However, the nut 3a is strongly tightened with a specified torque by another nut runner at a subsequent station.

As described above, after the assembly of the caps 3 is completed, the cap assembly unit 50 is returned upward and the next four caps 3 are assembled.
For mounting, the cylinder 34 of the lift unit 20 is returned and the lift arm 31 is moved.
When the cylinder 42 is returned, the cylinder 42 is returned to open the left and right lift arms 31, and then the lift unit 20 is returned to the upper position, the pallet P on which the cylinder block CB is placed can be conveyed. Transfer to the station. The above is the one-step cycle of assembling the bearing cap.

According to the bearing cap assembling device, the connecting rod large end portion 2a of the connecting rod 2 in the bottom dead center state of the first and fourth cylinders is provided.
Since the lift unit 20 for pulling up the cylinder block CB from above is provided, it is not necessary to provide a push-up device for pushing up the connecting rod large end portion 2a below the pallet transfer line. In the lift unit 20, since the connecting rod large end 2a of the connecting rod 2 in the bottom dead center state is lifted by lowering the lift arm 31, the connecting rod large end 2a located at the uppermost position is pulled up. Therefore, the lifting stroke of the lift arm 31 can be small, and the structure of the lift arm 31 can be simplified.
The cylinder 27 is also downsized, that is, the lift unit 20.
In addition to downsizing and simplification, the lift unit 20 can be disposed by effectively utilizing the portal frame 9 for the cap assembly unit 50.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view of a bearing cap assembling apparatus, FIG. 2 is a front view of the apparatus, and FIG.
FIG. 4 is a left side view of the same apparatus, FIG. 4 is a vertical sectional front view of a lift unit, FIG. 5 is a sectional view taken along line VV of FIG. 4, and FIG.
Fig. VI-VI line sectional view, Fig. 7 is a side view of the lift unit,
8 is a side view of the cap assembly unit, FIG. 9 is an enlarged vertical front view of the chuck mechanism, and FIG. 10 is an enlarged side view of the chuck mechanism. CB ... Cylinder block, 1 ... Piston, 2 ... Connecting rod, 2a ... Connecting rod large end, 3 ... Bearing cap, 4 ... Crankshaft, 9 ... Gate frame, 20 ... Lift unit, 31
… Lift arm, 32… Lift arm mechanism, 50… Cap assembly unit, 60 ・ 60A… Chuck mechanism, 68… Chuck arm.

Claims (1)

[Scope of utility model registration request] 1. An assembling apparatus for assembling a piston assembly comprising a piston and a connecting rod and a crankshaft, and assembling a bearing cap to a connecting rod large end of a cylinder block conveyed to a predetermined position in an inverted posture, Under the condition that the connecting rod in the bottom dead center state is supported from above the cylinder block by a pair of lift arms and is pulled up to the crankshaft side, and the connecting rod is pulled up by the pulling means,
A bearing cap assembling device for an engine, comprising: an assembling means for assembling a connecting rod bearing cap held by a chuck mechanism to a connecting rod large end.