JPH033738A - Assembly device for rocker arm - Google Patents

Abstract

PURPOSE:To equip a press means pressing to the receiving part of a cylinder head and to assemble an assembly body to a cylinder head smoothly by pressing a rocker shaft at the part where the reaction force of a valve spring is received at least of the assembly body. CONSTITUTION:A rocker shaft 170 is pressed to each receiving part 240a of a cylinder head 240 with the head 262 supported on the press arm 261 of a press means 260 and applying pressure to the shaft 170 from the upper part on the rocker arm 70 of the cylinder where the reaction force of a valve spring 271 is acted with the abutment of the rocker arm 70 on the noze of a cam 270 at assembly time. In this state, a bolt temporary fastening means 220 is advanced to a specific position on a rail 221, and the head part 222 thereof is descended to perform the temporary fastening of a bolt set. The press means 260 is moved to the specific position after a rocker arm assembly body 200 is held on the cylinder head 240 by a lift unit 250 to press the rocker arm 70.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rocker arm assembly device for assembling, for example, an automobile engine.

(Prior art) Automated assembly of various parts such as rocker arms in the assembly of automobile engines has been conventionally known, as described in, for example, Japanese Utility Model Application No. 61-14.4.918. Are known. However, in the conventional technology, when assembling the rocker arm assembly to the cylinder head, the rocker shaft was directly pressed against the strong reaction force of the valve spring, so a bending moment acts on the rocker shaft, causing the rocker arm There was a risk that the fulcrum axis would tilt.

(Object of the invention) The present invention has been made in view of the above problems, and includes:
It is an object of the present invention to provide a rocker arm assembly device capable of smoothly assembling an assembly to a cylinder head without creating a bending moment on a rocker shaft due to the reaction force of a valve spring.

(Structure of the Invention) A rocker arm assembling device according to the present invention is a rocker arm assembling device that presses an assembly in which rocker shafts are inserted into a plurality of rocker arms to a receiving portion of a cylinder head and assembles it with bolts. a transfer means for holding the assembly at a portion other than the end of the rocker shaft and transferring it to just above the cylinder head; and a shaft holding means that can be raised and lowered to support the end of the rocker shaft right above the cylinder head. The present invention is characterized in that it includes a pressing means for pressing the rocker shaft against the receiving portion of the cylinder head by pressing at least a portion of the assembly that receives the reaction force of the valve spring.

(Function) The rocker arm assembly is held by the transfer means at a portion other than the end of the rocker shaft, and is transferred to just above the cylinder head, and at that position, a shaft holder that supports the end of the rocker shaft and can be moved up and down. Uke is determined by the means. At least a portion of the assembly held by the shaft holding means that receives the reaction force of the valve spring is pressed by the pressing means, thereby pressing the rocker shaft against the receiving portion of the cylinder head, and in this state, the cylinder of the assembly is pressed. Assembly to the head is completed.

(Example) Examples will be described below based on the drawings.

FIG. 1 is an overall layout diagram of an assembly line for an inlet side rocker arm according to an embodiment of the present invention. As shown in the lower part of the figure, a roller conveyor 10 is provided to convey the cylinder head from left to right, and this constitutes a main line. Perpendicular to this main line, that is, in the vertical direction in the figure, is a conveyor 20 of the line that performs various operations to be described later for assembling the rocker arm. Note that, hereinafter, in FIG. 1, the left and right direction will be referred to as the X direction, and the up and down direction will be referred to as the Y direction.

A jig pallet 30 is loaded on the supply line conveyor 20 and is transferred from top to bottom in the Y direction to the station positions (15TA, 2STA, 3ST in Figure 1) where each work is performed.
A and 4STA).

At the first station (ISTA), a rocker arm is supplied onto the jig pallet 30 and set at a predetermined position. To this end, on the right side of the conveyor 20 in Figure 1, there are two rocker arm stockers 40 and 50 that store two types of rocker arms with different specifications depending on the model.
are arranged in parallel, and a rocker arm loader (rocker arm supply means) 60 is provided that moves between these two rocker arm stockers 40 and 50 in the Y direction and moves the position of l5TA in the X direction. .

In this embodiment, the intake side rocker arm of a 4-cylinder 16-valve engine is assembled, and the rocker arm stocker 40.50 has 8 rocker arms 70 for 4 cylinders as shown in FIG. 2(a). are arranged in a line at predetermined intervals, and many such lines are arranged in the Y direction. The rocker arm loader 60 takes out one cylinder of the rocker arm 70 from the rocker arm stocker 40.50 and supplies it to the jig pallet 30 at the first STA position. FIG. 2(b) shows a state in which the rocker arm 70 is set on the receiving jig 3I of the pallet 30. At this time, the rocker arm 70 shifts the outer rocker arm of the two rocker arms for each cylinder outward so that a coil spring, which will be described later, can be set in an uncompressed state between the arms. It is set with the distance between the arms wider than the standard dimensions.

A spring loader (spring supply means) 80 is disposed at the second station (2STA) so as to be movable in the X direction. This spring loader 80 sets a coil spring in a free state between two arms 70, 70 corresponding to each cylinder. Also, this 2STA
On the left side of the conveyor 20, a rocker shaft stocker 90 for storing rocker shafts and a lid 100 that can be raised and lowered to receive the rock carn shaft sent from the rocker shaft stocker 90 are provided.
Furthermore, the lifters 1 are located on the left and right sides of the conveyor 20.
Push shaft 11O and guide shaft +2 that sandwich the rocker shaft lifted by 00 from both ends
0 is placed.

Further, right above the pallet 30 of the 2STA, a rocker arm pressing means 130 is arranged to press the set rocker arm from above while applying a spring action. In the lifter 100, the rocker shaft is once placed in the holder as described later, and then held between the left and right centers and rotated to position the bolt holes, and in this state, the rocker shaft is returned to the holder. , Lift the receiver and push the shaft 1 into one end of the rocker shaft.
Guess 10. On the other hand, the guide shaft 120
The rocker arm 70 set on the guide shaft 120 and held down by the rocker arm holding means 130 is inserted and moved forward, and the rocker shaft is held under pressure between the guide shaft 120 and the pushing shaft 110.

Next, the guide saw shaft 120 moves toward the rear retracted position, and at the same time, the push shaft +10 is pushed in, thereby inserting the rocker shaft into each rocker arm 70.

In the third station (3STA), the rocker arm 70 is moved to the IJ by the 1] Shifting means] 4.0 arranged on the left and right, the coil spring is compressed, and the distance between the arms is maintained at a regular pitch. Then, a set of mounting bolts and washers is supplied by the bolt/washer supply means +50. FIG. 2(c) shows the rocker arm 70. The coil spring 160, rocker shaft 170 and bolt cellar I-180 are shown set on the receiving jig 3I. The bolt sets 180 are taken out one by one from the Pol 1 washer stocker 190 by the Holt washer supply means 150 and installed at predetermined positions on the rocker shaft 170.

Next, at the fourth station (4STA), the rocker arm assembly 200 set in the shape shown in FIG.
The rocker arm assembly is transferred to the rocker arm assembly transfer means) 210, and then transferred onto the main line, which is the fifth station (5STA).

In 5STA, a shaft holding means provided in a lift unit, which will be described later, receives the assembly 200 from the rocker assembly loader 210 and supports it with a slight gap from the receiving part of the cylinder head. Then, the rocker arm assembly is assembled to the cylinder head with the pressing means pressing the rocker arm that receives the reaction force of the valve spring during assembly.

Next, the cylinder head is transferred on the roller conveyor IO to the position of the bolt final tightening means 230, and the bolt is fully tightened, completing the assembly as shown in FIG. 2(e).

FIG. 3 shows the jig pallet 30 with the rocker arm 70, coil spring 160, and rocker shaft 170 assembled in 2STA (however, the coil spring 160 is not shown). Further, FIG. 4 is a plan view thereof (however, rocker arms and the like are not shown).

), FIG. 5 is a side view thereof, and FIG. 6 is a sectional view taken along the line A-Δ in FIG. 4. Each rocker arm 70 is mounted on the jig pallet 30.
Eight receiving jigs 31 are disposed for receiving. Of these, the two receiving jigs 31 at the center of the inside and the second receiving jig 31 from both ends are fixed to the pallet base 30a, and the receiving jigs 31 at both ends and the third receiving jig 31 from both ends are fixed to the left and right sides. It is skewered by two parallel guide rods 32 and can be moved left and right. Each receiving jig 3I has a rocker arm 7
A receiving member 31a that supports both ends of 0 from below, and this receiving member 3
Each receiving member 3 is provided with side plates 31b fixed on both sides of the rocker arm 1a to regulate the rocker arm 70 and prevent it from falling.
1a is attached to a fixed base 31c or a movable base 31d of the receiving jig 31 via two guide rods 38 with an upward spring action applied by a coil spring 33. Each of the guide rods 32 has one end supported by a support portion 30b formed at each side end of the pallet base 30a, and the other end supported by each fixed receiving base 31c inside.

In addition, the two left and right movable receiving bases 31d each have a collar 34.
They are connected to each other by mounting bolts 34b across a. A coil spring 34. c is set, so that both movable receiving bases 31d are urged outward with respect to the intermediate fixed receiving base 31C. Furthermore, regulating members 35a and 35b are provided facing each other on the intermediate stationary receiving base 31c and the inner movable receiving base 31d, which regulate the distance by coming into contact with each other.

The mounting bolt 34b is attached from the outside so as to pass through the outer movable receiving base 31d, and a pressure receiving member 34d that receives the pressing force of the width shifting means 140 is clamped to the head portion of the mounting bolt 34b. Further, an inverted-shaped bracket 36 is fixed to the negative side of the outer movable receiving base 31d. On the other hand, a locking pin 37 is provided on the pallet base 30a at a position facing the bracket 36.

This locking pin 37 is mounted while being biased upward by a spring 37a, and is normally held down by the top plate portion of the bracket 36. When the movable receiving base 31d of the centering means 140 is pushed in, the locking pin 37 fits into the locking hole 36a formed in the top plate portion of the bracket 36, thereby maintaining the pushed position. As a result, the pitch between the arms can be adjusted as shown in Figure 2 (c
) are the regular dimensions shown.

When the adjustment is completed, a set of six bolts 180 is inserted into the bolt holes of the rocker arm 70, as shown in FIG. 2(c). Then, at 4STA, the rocker assembly loader 210 grabs the rocker arm assembly 200 (see FIG. 2(d)) and transports it to 5STA. In addition,
The engagement of the locking pin 37 is released by being pushed by a release unit (not shown) in 4STA.

FIG. 7 shows the head 211 of the rocker assembly loader 210.
FIG. 8 is a side view thereof, FIG. 9 is a view taken along arrow A in FIG. 7, and FIG.
FIG. The head 211 of the rocker assembly loader 210 has four axial positioning arms 212 placed laterally between a pair of rocker arms 70 for each cylinder, and eight axial positioning arms 212 that grip the rocker arms 70 by pressing against these arms 212. A clamp claw 213, a rocker arm clamp cylinder 214 for opening and closing the clamp claws 213 in the axial direction of the rocker shaft 170, and a rocker arm clamp cylinder 214 that is attached to both end surfaces of the rocker shaft 1'70 for positioning within the shaft plane. The rocker arm assembly 200 is positioned by being inserted into the two fork-shaped planar positioning arms 215 and the positioning hole 241 provided in the cylinder head 240.
It is comprised of a rod-shaped positioning pin 216 for holding it in a slightly floating state from a. As shown in FIG. 10, the tip of the axial positioning arm 212 has a shape 2 that follows the outer diameter of the coil spring 160. Boss part 70 of 70
It is sandwiched between a.

FIG. 11 shows the arrangement of each device in 5STΔ. The head 211 of the rocker Alan Low'/210 is
Slide table 21 connected to lifting cylinder 2+7
8, and the rocker arm assembly 200 is transferred to a position directly above the cylinder head 240 by the head 21+ of the rocker assembly loader 21O. 5S
At the 'TA position, a lift unit 250 that lifts the cylinder head 240 is provided between two rows of conveyor rollers l'l and +2 on which the cylinder head 240 is placed. The lift unit 250 also includes shaft holding means for receiving and holding the rocker arm assembly 200 from the rocker assembly loader 210, as will be described later. Further, a temporary bolt tightening means 220 is provided at a position opposite to the supply line of the 5STA. The bolt temporary tightening means 220 can move forward and backward once on the rail 221, and its head portion 222 is vertically movable.

As shown in FIG. 12, the lift unit 250 includes a lift plate 252 that is guided by two kite rods 251 and moved up and down by a cylinder (not shown). A plurality of support rods 253 supporting the cylinder head 240 are provided on the lift plate 252, and at both left and right ends of the lift plate 1-252,
A pair of opposing centers (yaft holding means) 254 for temporarily holding the rocker arm assembly 200 from the rocker assembly loader 210 is provided.
A pair of support stands 254 support the vertical rails 254a.
c is the horizontal rail 254 of the lift plate 2521
d in the axial direction of the rocker shaft 170. Both centers 254 of this lift plate 1-250 support and receive the rocker arm assembly 200 transferred by the rocker assembly loader 210 by supporting both ends of the shirt 1-217.

At this time, the rocker shaft +70 spring action is applied and the rocker shaft is slightly lifted from the receiving portion 240a of the cylinder head 240. During assembly, the rocker arm 70 of the cylinder comes into contact with the nose of the cam 270 and the reaction force of the valve spring 271 acts on the rocker arm 70 of the cylinder.
On the other hand, as shown in FIG. 13, the head 262 supported by the pressing arm 26+ of the pressing means 260 pushes the rocker shaft 170 into each receiving part 240a of the cylinder head 240. Being pushed.

In this state, the port temporary tightening means 220 is connected to the rail 221.
The upper part advances to a predetermined position, and the head part 222 descends to temporarily tighten the bolt set 180.

The pressing means 260 can be moved up and down by a slide member 263, and the pressing arm 26 has a cylinder 265 at the end opposite to the end supporting the head 262 across the support shaft 264. 5 6 Connected. The pressing means 260 is the lift unit 2
After the rocker arm assembly 200 is held on the cylinder head 240 by the cylinder head 50, it is moved to a predetermined position and its cylinder 265 is activated to press the rocker arm 70.

(Effects of the Invention) Since the present invention is configured as described below, the rocker arm assembly can be smoothly assembled to the cylinder head by preventing bending moment on the rocker shaft due to the reaction force of the valve spring. .

[Brief explanation of the drawing]

Fig. 1 is an overall layout diagram of rocker arm assembly according to an embodiment of the present invention, Fig. 2 is a layout diagram of parts and assemblies at each station of the embodiment, and Fig. 3 is a jig in the embodiment. 4 is a front sectional view showing the structure of the pallet; FIG. 4 is a plan view; FIG. 5 is a partial sectional view of the same side;
The figures are a sectional view along line A in Figure 4, Figure 7 is a front view of the head of the rocker assembly loader in the same embodiment, Figure 8 is a side view of the same, Figure 9 is a view taken along arrow A in Figure 7, and Figure 10. is Figure 7B'
-B sectional view, FIG. 11 is a device layout diagram of the fifth station in the same embodiment, FIG. 12 is a front view illustrating the structure and operation of the lift unit and pressing means in the fifth station, and FIG. 13 is the same. FIG. 3 is a side view of the pressing means. 70, rocker arm, 170: rocker shaft, I
80: Bolt set, 200: Rocker arm assembly,
2IO: Rocker assembly loader, 211: Head,
240 cylinder head, 240a; receiving part, 250: lift unit, 254° center (shaft holding means)
, 260 - Pressing means, 271: Valve spring.

Claims (1)

[Claims] (1) A rocker arm assembly device in which an assembly in which rocker shafts are inserted through a plurality of rocker arms is pressed against a receiving part of a cylinder head and assembled with bolts, and the assembly is held at a portion other than the end of the rocker shaft. transport means for transporting the rocker shaft to a position directly above the cylinder head; a shaft holding means that supports the end of the rocker shaft directly above the cylinder head and is movable up and down; A rocker arm assembling device comprising a pressing means for pressing a receiving portion of the cylinder head by pressing a portion that receives a reaction force of a spring.