JPH02243231A - Assembly device for locker arm - Google Patents

Abstract

PURPOSE:To automatize the assembly work of a locker arm and spring by arranging a proper means holding a specific interval between adjacent rocker arms in the assembly device of a locker arm of an automobile engine and so on. CONSTITUTION:On this assembly station S, a locker arm assembly device D assembling four rocker arms to a locker shaft C with four springs is equipped. A transfer conveyor 1 transfer the locker shaft C to the assembly position by holding it horizontally on a plate-like holding base 2. A feeding conveyor 3 is arranged at both sides of the transfer conveyor 1 to feed each locker arm of the upper face to a feeding position. A part feeder 4 is arranged at both sides of the transfer conveyor 1 to feed each spring to the feeding position. Each locker arm and spring fed to the respective feeding positions are held by the chuck 7 provided at the tip of each arm 6 of a part feeding robot 5 and inserted from the both ends to the tip of a crankshaft 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an assembly device for a rocker arm that constitutes a valve mechanism of an internal combustion engine, such as an engine of a vehicle such as an automobile.

(Prior art) Conventionally, as this type of assembly device, for example, the Japanese Patent Publication No. 62
As disclosed in Japanese Patent No. 46682, when assembling a plurality of rocker arms together with a plurality of springs to a rocker shaft, an assembling jig provided with a plurality of spacer members is prepared, and the It is known that each rocker arm is positioned with respect to the rocker shaft by each spacer member, and a predetermined distance is maintained between adjacent rocker arms.

(Problem to be Solved by the Invention) However, although the above-mentioned conventional assembly device can assemble a plurality of rocker arms together with a plurality of springs in the proper position of the rocker shaft, the method for doing so is difficult for an operator to perform as described above. Each rocker arm and spring must be manually adjusted and assembled between adjacent spacer members, which poses a problem in that this assembly work is extremely troublesome.

The present invention has been made in view of the above, and an object of the present invention is to provide the above-mentioned rocker arms and springs by providing appropriate means for maintaining a predetermined distance between adjacent rocker arms. The purpose of this invention is to facilitate the assembly work.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention is directed to an apparatus for assembling a plurality of rocker arms together with a plurality of springs to a rocker shaft, and in this case, an insertion means is provided, The insertion means inserts each of the rocker arms together with each spring into the rocker shaft held by the holder from both ends thereof. moreover,
A plurality of stopper members are movably provided on the holding base,
When inserting the rocker arm and spring, each of the stopper members is moved to a retracted position to allow insertion of each of the rocker arm and spring into the rocker shaft, while after inserting the rocker arm and spring,
The rocker arms and springs are moved to positioning positions to position each rocker arm and spring relative to the rocker shaft.

Further, a moving means for moving each of the stopper members to a retracted position and a positioning position is provided.

(Function) With the above configuration, in the present invention, when inserting the rocker arms and springs, the plurality of stopper members movably provided on the holding base allow the plurality of rocker arms and springs to be inserted into the rocker shaft. In order to do this, the rocker arms are moved to the retracted position by the moving means, and the rocker arms, together with the respective springs, are inserted from both ends into the rocker shaft held by the holding base by the insertion means. On the other hand, after the rocker arms and springs are inserted, each stopper member is moved to a positioning position by the moving means to position each rocker arm and spring with respect to the rocker shaft, and each rocker arm is moved into the rocker together with each spring. attached to the shaft.

Therefore, each rocker arm and spring can be assembled to the rocker shaft automatically and reliably without the need for manual labor by an operator (while maintaining a predetermined distance between adjacent rocker arms). , the assembly work will be made easier.

(Example) Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows multiple (four) rocker arms A, A.

... with multiple (four) springs B, B, ...
Also shown is a schematic configuration of an assembly station S equipped with a rocker arm assembly device according to an embodiment of the present invention, which is assembled to a rocker shaft C according to the procedure shown in FIGS. 7(a) to 7(f). 1 is a transport conveyor that holds the rocker shaft C horizontally on a plate-shaped holding base 2 and transports it to the assembly position; 3.3 is a transport conveyor that is arranged on both sides of the transport conveyor 1, and that controls each of the rocker arms A; The supply conveyor 4゜4 for supplying to the supply position is a parts feeder which is also arranged on both sides of the conveyor 1 and supplies each of the springs B to the supply position. The rocker arm A and the spring B are chucked and held by a chuck 7.7 provided at the tip of each arm 6 of the parts supply robot 5.5, and the clamp shaft 1, which will be described later,
It is designed to be inserted into the tip of No. 2 from both sides.

Further, on the side of each of the parts feeders 4, as shown in enlarged detail in FIG. A through hole 9a is provided at the tip.
A cylindrical push-in shaft 9 is attached via a bracket 10. Further, on the side of the push cylinder 8, a clamp cylinder 11 having a piston rod 11a that similarly extends toward the conveyor 1 side is arranged. A clamp shaft 12 is attached to the clamp shaft 9a with its tip protruding. The clamp shaft 12 is moved forward by the extension of the clamp cylinder 11, as shown by the imaginary line in FIG.
a into a machined hole (not shown) of the rocker shaft C held on the holding table 2, and supporting the rocker shaft C from both sides in place of each stopper member 14, which will be described later, to form the holding table. 2, it is held horizontally. Further, the push shaft 9 is moved forward by the extension operation of the push cylinder 8 when the clamp shaft 12 is in the forward movement state, and each of the rocker arms A is held on the distal end side of the clamp shaft 12 by external fitting. is pressed together with each spring B and inserted into the rocker shaft C from both ends thereof. Therefore, each rocker arm A is inserted with each spring B from both ends of the rocker shaft C held horizontally on the holding base 2 by the push cylinder 8, push shaft 9, clamp cylinder 11, clamp shaft 12, etc. Means 13 are constructed.

Furthermore, as shown in enlarged detail in FIG. 3 and FIG.
A plurality (four) of stopper members 14° 14, . It is supported by two guide rods 15 and 15 that pass through it in the vertical direction, and is arranged to be movable up and down. Further, on the lower surface of the holding table 2, a plate 16 is provided with two supporting members 17.
The upper end of the plate 16 is attached to a plate 18 that supports both guide rods 15.15, while the lower end passes through the plate 16 and connects the lower end bulge 19a to the plate 16. A rod 19 is disposed that projects from the lower surface of 16 and extends in the vertical direction.

Each of the stopper members 14 is normally urged upward by the spring force of a spring 20 compressed into the rod 19 and moved upward to a positioning position, and in this state, the rocker shaft C is horizontally moved. It is designed to hold. Note that a positioning pin 21 for positioning the rising end position of each of the stopper members 14 is attached to the plate 16.

In addition, on the fixed assembly position side of the assembly station S,
There are four moving means for moving the stopper members 14 up and down between the retracted position and the positioning position (see Figs.
(only one of which is shown in the figure) lift cylinder 22. 22.
... are fixedly arranged in corresponding positions below each of the stopper members 14, and the respective cylinders 22
At the tip of the piston rod 22a extending upward, there is a dovetail-shaped engagement groove 23 that opens in the moving direction of the conveyor 1.
An engagement block 23 with a is attached. When the rocker shaft C is held horizontally by each stopper member 14 of the holding table 2 and conveyed to the assembly position by the conveyor 1, the lower end of each rod 19 protruding below the holding table 2 expands. The protruding portion 19a engages with the engagement groove 23a of each engagement block 23, and in this engaged state,
When inserting the rocker arm A and the spring B, each of the stopper members 14 is moved downward to the retracted position by the contraction operation of the elevating cylinder 22, as shown by the imaginary lines in FIGS. 3 and 4, and each of the insertion means The rocker arms A and springs B are allowed to be inserted into the rocker shaft C by the pushing operation of the push-in shaft 9 of 13.

On the other hand, after inserting rocker arm A and spring B,
As shown by solid lines in FIGS. 3 and 4, each stopper member 14 is moved upwardly to the positioning position by the extension operation of the elevating cylinder 22, and each rocker arm A and spring B is moved relative to the rocker shaft C. The positioning is performed against the biasing force of B.

A notch 9b (indicated by a broken line in FIG. 2) is formed at the tip of the push-in shaft 9, and is moved upward when positioning the rocker arms A and springs B. It is designed not to interfere with each stopper member 14.

Furthermore, as shown in enlarged detail in FIG. 5, a cylindrical receiver is disposed between the stopper members 14 and 14 located on the inner side of each of the stopper members 14, with a member 24 fixed therein. A center bin 25 is fixed to the upper end of a rod 26 and is arranged inside the member 24 so as to be movable in the vertical direction.

Further, a guide groove 27 extending in the vertical direction is formed in the rod 26, and a guide bin 28 provided on the inner surface of the lower end of the receiver member 24 is slidably engaged in the cough guide groove 27. When the member 24 moves in the vertical direction, the receiver restricts the rotation around the axis and ensures that the lock ball 30, which will be described later, is engaged with each engagement recess 29. There is. Further, on the opposite side of the rod 26 from the guide groove 27, a pair of engagement recesses 29, 29 are formed at a predetermined interval in the vertical direction, while the receiver is provided at the lower end of the member 24 with a locking groove. The ball 30 is urged inward in the radial direction by the spring force of the spring 31 and moves into the accommodation hole 3.
A part of it sticks out from 2. When the rocker arm A and the spring B are assembled to the rocker shaft C, the cylinder 33 for raising the bottle placed at the assembly position of the assembly station S is operated to extend, so that the piston of the cylinder 33 for raising the bottle 33 is moved. A pressing member 34 attached to the tip of the rod 33a is used to push up the rod 26, which is in the lowered position as shown by the imaginary line in FIG.
As shown by the solid line in FIG.
The receiver is made to protrude from the member 24, and the rock held by the holding base 2 is inserted into the bolt insertion hole C1 at the center of the shaft C, so that the rocker shaft C is positioned in the member 24. There is. In this positioning state, the other four bolt insertion holes cI+ c++ . Bolts E (shown in FIG. 6) are inserted into the respective bolt insertion holes C1 of the rocker shaft C on which the rocker arm A and spring B have been assembled at the assembly station S. At this time, the center bin 25 is lowered, and the bolt insertion hole 1 of the bolt E is
4a.

Further, the rocker shaft C into which the bolt E and the cap F of the rocker shaft C are set is transferred to the next assembly stage gin, and is clamped and held by an assembly jig 35 as shown in FIG. Assembled into the cylinder head. Specifically, the assembly jig 35 includes a plate 37 attached to the tip of a piston rod 36a extending downward of the lifting cylinder 36, and the plate 37 is arranged on both sides of the lifting cylinder 36. It is supported by a pair of guide rods 38, 38 extending in the vertical direction, and is configured to move in the vertical direction by the expansion and contraction operation of the elevating cylinder 36. Further, a pair of clamp cylinders 40, 40 supported by brackets 39 are disposed at both ends of the plate 37, and a clamp pin 41 is connected to a piston rod (not shown) of each clamp cylinder 40.
are projected by the extension operation of each of the clamp cylinders 40 and engaged with the holes machined at both ends of the rocker shaft C,
Thereafter, the rocker shaft C is received and supported from each stopper member 14 of the holding table 2 by the contraction operation of the lifting cylinder 36. Further, on the lower surface of the plate 37, there are four guide members 44, 44. ... are attached, and when passing the rocker shaft C from the holding base 2 side to the assembly jig 35 side, each of the guide members 4 is attached in place of each stopper member 14.
4 to guide and position each rocker arm A and spring B. The positioning of each guide member 44 prevents each rocker arm A and spring B from interfering with the rocker shaft bearing portion of the cylinder head when assembling the assembled rocker shaft C to the cylinder head, thereby improving the ease of assembly. . Further, the tip of the spring guide 43 is set so as not to interfere with the rocker shaft bearing during assembly.

Next, FIG. 7 shows how to assemble a plurality (four) rocker arms A, A, . . . and springs B, B, . The explanation will be based on a) to (f). In addition, in the figure, the stopper member 14 is shown only when it is moving upward to the positioning position, and when it is not shown, it is assumed that it is moving downward to the retracted position.

The arrangement of the rocker arm A and the spring B is reversed from that described above (see FIG. 2), for example, on the intake side.

(1) First, as shown in FIG.
,14. ... and the receiver are held horizontally by the member 24 and transported to the assembly position of the assembly station S. At this time, the center pin 25 is pushed upward by the extension operation of the pin lifting cylinder 33, and the lock ball 30 is engaged with the lower engagement recess 29 and inserted into the center bolt insertion hole c1 of the rocker shaft C. This allows the rocker shaft C to be positioned without shifting laterally.

Also, a plurality of (four) rods 19, 19 . Each of the lower end bulging portions 19a of... is engaged with the engagement block 23 on the side of each lifting cylinder 22 arranged below the positioning position of the assembly station S.
It is engaged with a.

(2) Next, the parts supply robot 5 inserts the rocker arm A and spring B supplied from the supply conveyor 3 and the parts feeder 4 into the distal end side of the clamp shaft 12 , and then the clamp cylinder 11 is extended, so that the clamp shaft 12 The tip is inserted into the tip machining hole of the rocker shaft C, and the rocker shaft C is supported.

(3) Thereafter, by the contraction operation of each lifting cylinder 22, each rod 19 is moved downward against the spring force of the spring 20, and each stopper member 14 is moved as shown in FIG. 7(b). Move down.

(4) After pressing, push the push shaft 9 into the cylinder 8.
As shown in FIG. 7(C), the rocker arm A and spring B are inserted into the rocker shaft C from both sides by being moved forward by the extension action of FIG. 7(d). , the inner stopper member 14.14 of each of the stopper members 14 is moved upwardly by the extension operation of each lifting cylinder 22;
The inserted rocker arm A and spring B are positioned by the inner stopper member 14.14.

(5) Next, after the pushing cylinder 8 is retracted, the clamp cylinder 11 is retracted to remove the tip of the clamp shaft 12 from the tip machining hole of the rocker shaft C, and follow the procedure of ('2J) above. Next rocker arm A and spring B are attached to the clamp shaft 12.
After the clamp shaft 12 is inserted into the distal end side, the clamp cylinder 11 is extended to reinsert the distal end of the clamp shaft 12 into the distal end machining hole of the rocker shaft C, thereby supporting the rocker shaft C.

(6) Thereafter, by moving the push-in shaft 9 forward by the extension action of the push-in cylinder 8 in the manner described in (4) above, the rocker arm A and spring B are moved into the rocker as shown in FIG. 7Ce). After inserting into the shaft C from both sides, as shown in FIG. 7(f), the stopper members 14, 14 located on the outside of the respective stopper members 14 are moved upwardly by the extension operation of each lifting cylinder 22, The inserted rocker arm A and spring B are positioned by the stopper member 14.14 located on the outside. This allows multiple (4
) rocker arms A, A, . . . are sequentially assembled to a rocker shaft C together with a plurality (four) of springs B, B, .

(7) After that, the rocker shaft C is assembled with each rocker arm A and spring B as described above.
are transported to the bolt assembly station, and the plurality (5) bolt insertion holes CI, CI+ of the rocker shaft C are
Insert bolts E, E, and so on. At this time, the center bin 25 is pushed down by the corresponding bolt E.

(8) After that, the rocker shaft C into which each bolt E has been inserted is inserted into the clamp cylinder 40.4 of the assembly jig 35.
After each clamp bin 41 is engaged with the machined hole and held in a clamp state by the extension action of 0, the rocker shaft C is received from each stopper member 14 of the holding base 2 and supported by the contraction action of the elevating cylinder 36. and assemble it to the cylinder head.

As described above, in this embodiment, when inserting the rocker arm A and the spring B, the plurality of stopper members 14, 14, . , ... and spring B,
In order to allow the insertion of the rocker arms A into the rocker shaft C, the lifting cylinders 22, 22°... move the rocker arms A downward to the retracted position, and
At the same time, the insertion means 13 inserts the rocker shaft C, which is held horizontally on the holding table 2, from both ends thereof. - On the other hand, after inserting the rocker arm A and the spring B, the stopper members 14 are moved by the lifting cylinders 22 in order to position the rocker arm A and the spring B against the biasing force of the spring B. The rocker arms A are moved upward to the positioning position, and each rocker arm A is assembled to the rocker shaft C together with each spring B.

From this, each rocker arm A and spring B can be automatically assembled to the rocker shaft C while maintaining a predetermined distance between adjacent rocker arms A and A without manual work by an operator. Moreover, it can be performed reliably, and the assembly work can be facilitated.

(Effects of the Invention) As explained above, according to the present invention, when inserting the rocker arm together with the spring into the rocker shaft held by the holding base from both ends thereof, the stopper member is moved to the retracted position and the rocker shaft is moved to the retracted position. While allowing the arm and spring to be inserted into the rocker shaft, after inserting the rocker arm and spring, the stopper member is moved to the positioning position to position the rocker arm and spring with respect to the rocker shaft. The rocker arm and spring can be automatically assembled to the rocker shaft, making the assembly work easier.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an assembly station equipped with a rocker arm assembly device according to an embodiment of the present invention, FIG. 2 is an enlarged plan view showing an insertion means portion, and FIG. 3 is an operating mechanism portion of a stopper member. Fig. 4 is an enlarged side view of the main part, Fig. 5 is an enlarged vertical sectional front view of the main part showing the operating mechanism of the center bin, Fig. 6 is a front view of the assembly jig, 7th
Figures (a) to (f) are explanatory diagrams illustrating a procedure for assembling a rocker arm and a spring to a rocker shaft. 2... Holding base 13... Insertion means 14... Stopper member 22... Lifting cylinder (moving means) A... Rocker arm B... Spring C... Rocker shaft D... Rocker Arm assembly equipment agent: Hiroshi Mae Tahiro (24 others) 'L・Figure 5Figure 3Figure 4Figure 7Figure 7

Claims (1)

[Claims] (1) A device for assembling a plurality of rocker arms together with a plurality of springs onto a rocker shaft, comprising an insertion means for inserting each of the rocker arms together with each spring into the rocker shaft held on a holding base from both ends thereof; It is movably provided on the holding base, and when the rocker arm and spring are inserted, it moves to a retracted position to allow each of the rocker arms and springs to be inserted into the rocker shaft. A locker comprising a plurality of stopper members that move to position each rocker arm and spring with respect to the rocker shaft, and a moving means that moves each of the stopper members to a retracted position and a positioning position. Arm assembly device.