JPH06297274A - Rocker arm assembling method - Google Patents

Abstract

PURPOSE:To locate accurately respective members individually by inserting a dummy shaft longer than a gap between opposed sides of two holder members adjacent to each other into a member like a rocker arm to assemble a rocker arm unit. CONSTITUTION:Rocker arm shafts 5L, 6L are inserted into respective bearing holes to exclude respective dummy shafts to a chuter. Next, first base plates of a fixed stand and pressure stand are adapted to move back, release the ends of the rocker arm shafts 5L, 6L out of notches in the pressure plates 99 and center end holders 95, 97 on the center axis in place of the pressure plates 99. Respective cam holders and an end holder 97 are further moved to the end holder 95 side so that both ends of the respective rocker arm shafts 5L, 6L are inserted into the bearing holes respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a plurality of holder members arranged in parallel at a predetermined pitch, and a rocker arm is assembled so as to be pivotally supported on a rocker arm shaft penetratingly supported across the plurality of holder members. A method of assembling a rocker arm.

[0002]

2. Description of the Related Art As a conventional assembling method, Japanese Patent Laid-Open No. 3-3 has been proposed.
According to Japanese Patent No. 2534, each holder member is set on a pallet mounted on a conveyor and circulated with a spacing wider than the above-mentioned predetermined pitch, and a rocker arm and an axial position of the rocker arm are held between these holder members. With a spring, etc. mounted on it, from the holder member side at one end in the parallel installation direction to the bearing holes for the rocker arm shafts provided in each holder member, extend a dummy shaft longer than the rocker arm shaft across each holder member. So that the rocker arms and springs between the holder members are axially supported by the dummy shaft, and while guiding from this state by the dummy shaft, the mutual distance between the holder members is narrowed to a predetermined pitch, and then the other end in the juxtaposed direction. Insert the rocker arm shaft so that it straddles each holder member from the holder member side of And conversion, the rocker arm and a spring which is supported by a dummy shaft that so as to axially supported by the rocker arm shaft is known.

[0003]

SUMMARY OF THE INVENTION In the above conventional method,
When inserting the dummy shaft, all the rocker arms and springs must be positioned with a certain concentricity with respect to the common hole axis of the bearing hole of each holder member. However, since the rocker arm and the spring are individually set and positioned on the seating surface for positioning provided on the pallet, if foreign matter such as dust is caught between the seating surface and the rocker arm or spring, the above-mentioned common hole The concentricity of the rocker arm and the spring with respect to the shaft cannot be ensured, and when the dummy shaft is inserted, the shaft interferes with any of these members and cannot be inserted, resulting in an assembly error.

An object of the present invention is to provide a rocker arm assembling method capable of preventing the occurrence of such an assembling error as much as possible.

[0005]

According to the present invention, a plurality of holder members are arranged side by side at a predetermined pitch, and a rocker arm is pivotally supported on a rocker arm shaft penetratingly supported across the plurality of holder members. In the method of assembling, the step of assembling a rocker arm unit by inserting a dummy shaft longer than the distance between the facing side surfaces of two adjacent holder members into the rocker arm, and temporarily setting the rocker arm unit with a distance wider than the predetermined pitch. The step of setting the rocker arm unit between the holder members such that the dummy shaft of the rocker arm unit matches the hole axis of the bearing hole for the rocker arm shaft formed in each holder member, and the interval between the holder members Narrowing to a specified pitch and inserting the end of the dummy shaft into the bearing hole, and the installation direction By inserting the rocker arm shaft Bearing holes from the holder member side end, characterized in that a step of extruding the dummy shaft from the holder member side of the arrangement direction other end.

[0006]

[Operation] By previously supporting the rocker arm and the spring on the dummy shaft to form a unit, the concentricity between the rocker arm and the spring can be secured, and the dummy shaft can be inserted into the bearing hole. Thus, the concentricity of each member with respect to the bearing hole can be secured. Therefore, the rocker arm shaft can be inserted through the plurality of holder members while pushing out the dummy shaft without interfering with these holder members and members such as rocker arms, so that the rocker arm can be assembled smoothly and securely. can get.

[0007]

EXAMPLE An example in which the present invention is applied to assembling a rocker arm in a so-called 4-cylinder 1-cam 4-valve engine will be described. In the case of this embodiment, as shown in FIG. 14, it straddles the end holders 95, 97 at both ends and the first cam holder 96-1, the second cam holder 96-2, and the third cam holder 96-3 arranged between them. Exhaust side and intake side rocker arm shafts 5L and 6L supported in parallel with each other
The rocker arm 31 on the exhaust side and the rocker arm 31
The spring 33 that holds the axial position of the rocker arm 32, the intake-side rocker arm 32, and the wave washer 34 that also holds the axial position of the rocker arm 32 are assembled so as to be axially supported. The rocker arm shafts 5L and 6L are bearing holes 96a formed of a pair of through holes provided in each of the first to third cam holders 96-1 to 96-3.
・ In addition to being supported by being inserted through 96b, each end holder 65
A pair of bearing holes 95a, 95b and 97a, 97b, which do not pass through, are provided on each of the facing surfaces of 67, and their positions in the longitudinal direction are regulated.

In this embodiment, as shown in FIG. 1, in the station A, the rocker arms 31, 32 on the intake side and the exhaust side, the spring 33, and the wave washer 34 are arranged.
Is slightly slender than the rocker arm shafts 5L and 6L, and is axially supported by the dummy shafts 5 and 6 which are longer than the intervals between the facing side surfaces of the holders 95.96-1 to 96-3. Each rocker arm unit on the intake side and the exhaust side is assembled for each, and each rocker arm unit sub-assembled at the station A is transported to the assembly station B by the transport loader 7. Then, at the assembling station B, from the state where the above units are set between the first to third cam holders 96-1 to 96-3 which are arranged in advance at a pitch wider than the interval at the time of completion of the assembling Narrow the cam holder spacing so that the shaft ends of the dummy shafts will once receive bearing holes 96a and 96b.
Rocker arm shaft 5 which is waiting on the extension of the first to third cam holders 96-1 to 96-3 in the juxtaposed direction after being inserted into
L and 6L are inserted into the bearing holes 96a and 96b to replace the dummy shafts, and then both shaft ends of the rocker arm shafts 5L and 6L are attached to the bearing holes 95a and 95b and 97a of the end holders 95 and 97. Insert it into 97b to complete the assembly.

Hereinafter, the first to third cam holders 96-1 to 96-1 to
The configuration of each station will be described in detail with the arrangement direction of 96-3 as the front-back direction. As shown in FIGS. 2 and 3, the station A is provided with a pallet 2 for a rocker arm set that can be pulled out forward, and a first slide table 1 that can move back and forth in a lateral direction with the pallet 2 interposed therebetween. The 2nd slide table 4 is arrange | positioned facing. On the pallet 2, rocker arm mounting portions for four cylinders are arranged in parallel at intervals in the front-rear direction, and one mounting portion for each cylinder is provided on each mounting portion.
A pair of exhaust side rocker arms 31 and a spring 3 between them
3 and 3 are arranged side by side in the rough direction, and a pair of intake side rocker arms 3 for each cylinder are adjacently arranged in the front-rear direction.
2 and the intermediate wave washer 34 are arranged side by side in the lateral direction for rough setting. Instead of the wave washer 34, a free rocker arm (not shown) that is connected to both the rocker arms 32 and changes the opening / closing timing of the intake valve during medium-high speed operation may be used. On the first slide table 1, four workpiece pick-up parts 11 to 14 arranged in parallel in the front-rear direction corresponding to the second placing part are placed, and the first slide table 1 is moved up and down by a cylinder 15a. It is supported by a cylinder 1a on the lifting frame 15 so as to be moved forward and backward. The work take-up part 11 to 1
4, each tip is greatly tapered and
Four pairs of rods 11a to 14a that are freely retractable and are urged in the forward direction of the first slide table 1 by springs.
And 11b to 14b are mounted, and when the first slide table 1 is moved forward, the rods 11a to 14a are inserted into the rocker arms 31 and the springs 33 on the mounting portions, and the rods 11b to 14b are also rocker arms. 32 and a wave washer 34. Then, when the first slide table 1 is raised by the operation of the cylinder 15a subsequently, the rocker arms 3
2 and spring 33 and wave washer 34 are rod 1
The pallet 2 is picked up in a state in which 1a to 14a and 11b to 14b are inserted. In addition, each rod 11a-1
Since the tips of 4a and 11b to 14b are largely tapered, even if the rocker arms 31 and 32, the spring 33, and the wave washer 34 are slightly displaced on the pallet 2, they can be reliably picked up. . On the other hand, on the second slide table 4, four pairs of pushers 41a to 44a and 41b to 44b, which are opposed to each other on the axes of the rods 11a to 14a and 11b to 14b at the rising end position of the first slide table 1, are fixed. ing.
The pushers 41a to 44a and 41b to 44b are provided at their tips with holes through which the rods 11a to 14a and 11b to 14b can be inserted, and the first slide table 1 is at the rising end position. 4 is moved forward, the rocker arms 31 and 32, the spring 33, and the wave washer 34 of each cylinder are connected to the rods 11a to 14a.
And 11b to 14b along the pushers 41a to 4a.
4a and 41b to 44b move to push the first slide table 1 side and compress it to a predetermined size in the axial direction. By the way, the pushers 41a to 44a
The dummy shafts 5 are respectively loaded into the pushers 41b to 44b, and the dummy shafts 6 are loaded into the pushers 41b to 44b.
Further, a slide table 4 is provided on the slide table 4 so as to be movable back and forth.
Dummy shafts 5 and 6 by a pair of pushing rods 45
Are extruded to the first slide table 1 side. Then,
The dummy shafts 5 and 6 include rods 11a to 14a and 1
1b to 14b, and rods 11a to 14a and 11
b to 14b are pushed by the dummy shafts 5 and 6 to retreat against the biasing force of the springs, and each dummy shaft 5 is inserted into each exhaust side rocker arm 31 and spring 33 to form an exhaust side rocker arm unit 3a. At the same time, each dummy shaft 6 is inserted into the intake side rocker arm 32 and the wave washer 34 of each cylinder to form the intake side rocker arm unit 3b. The dummy shafts 5 and 6 are provided with taper portions at both axial ends, and the length of the dummy shaft 5 is equal to that of the rocker arm unit 3.
The protruding length from a is set to be slightly longer than the protruding length of the dummy shaft 6 from the rocker arm unit 3b. The loader 7 is located at both stations A and
A longitudinal arm 71 is provided in the front-rear direction that reciprocates along a guide frame 70 that is installed so as to straddle B. As shown in FIGS.
~ The fourth loader units 8-1 to 8-4 are slidably supported in the front-rear direction. The loader units 8-1 to 8-4 are connected to each other via a cylinder 72, and the loader unit 8-1 located at the rear end in the juxtaposed direction is connected to the main body of the loader 7 via the cylinder 72. There is.

The loader units 8-1 to 8-4 include rocker arm units 3a and 3b on the exhaust side and the intake side of each cylinder.
A chuck 80 for gripping is provided so that it can be raised and lowered by a cylinder 84 and can be turned 90 degrees by an air motor 83. The chuck 80 connects the rocker arm units 3a and 3b on the exhaust side and the intake side to the dummy shaft 5
Two pairs of clamp pieces 81 to be gripped in 6 are provided apart from each other in the axial direction of the dummy shafts 5 and 6, and the outer two of the two pairs of clamp pieces 81 of each set are arranged inside by a spring 81a. The two inner shafts are urged outward by springs 81b compressed between the two, and the dummy shafts 5 and 6 are gripped by the urging forces of these springs 81a and 81b. The chuck 8
2 was biased upward by a spring (not shown) to provide compliance downward.

When the small set of the rocker arm units 3a and 3b is completed at the station A, the chucks 82 of the rocker arm units 8-1 to 8-4 are lowered, and the lower end of the clamp claw 81 is first moved to the dummy shafts 5 and 6. Abut both ends of. When the chuck 82 is further lowered, each clamp claw 81 swings in the opening direction against the urging force of the springs 81a and 81b to clamp the dummy shafts 5 and 6, and the rocker arm unit on the exhaust side and the intake side of each cylinder. 3a and 3b engage with each loader unit while maintaining a predetermined relative positional relationship. In this way the dummy shaft 5
When 6 is clamped, the first and second slide tables 1 and 4 are both retracted laterally outward, and then the chuck 8
2 is raised to the state shown in the loader units 8-1 and 8-2 in the figure. Next, each chuck 82 is swung by the air motor 83 to move each loader unit to the position 8-3.
In the state of the two machines shown in 8-4, the dummy shafts 5 and the dummy shafts 6 held by the chucks 82 are aligned with a common longitudinal axis in the front-rear direction. Then, in this state, the loader 7 is moved to above the station B.

An assembly table 9 is provided at the front of the station B, and a rocker arm shaft 5L is provided at the rear of the assembly table 9 on a shaft insertion table 51 which is slidable in the front-rear direction.
・ 6L is retained.

As shown in FIGS. 6 and 7, a fixed base 90 for fixing the end holder 95 is provided at the rear end of the assembly table 9, and the first to third fixed bases 90 are arranged in this order from the fixed base 90 toward the front. First to third sliding bases 91-1 to 91-3 for setting the cam holders 96-1 to 96-3 and the end holder 97, respectively
A pressure table 93 is mounted slidably in the front-rear direction. The sliding bases 91-1 to 91-3 are sequentially connected in series to the fixed base 90 via the cylinder 91, and the pressurizing base 93 is directly connected to the main body of the assembly table 9 and has a larger size. They are connected via a cylinder 94. As shown in FIG. 8, a rail 90a that is long in the lateral direction is laid on the fixing base 90, and a first substrate 90b that is slid on the rail 90a by a cylinder 90e is provided.
A second substrate 90c that is downwardly compliant by being biased upward is placed on 0b. Further, the bearing 9 is attached to the second substrate 90c.
3rd held by 0g so that it can rotate around vertical axis CE
A substrate 90d is placed. The third base 90d is held at a neutral position in the rotational direction because one side end is sandwiched by a pair of spring pins 90y, and compliance is provided in both rotational directions. Further, as shown in FIG. 11, the bracket 90f connected to the first substrate 90b is clamped by a pair of spring pins 90x facing the cylinder 90e in the sliding direction of the first substrate 90b, and from the clamped position. Compliance is provided in the sliding direction, that is, in the lateral direction. In addition, a pair of stoppers 90z are set with a predetermined amount of clearance with respect to the bracket 90f in order to regulate the movable range by the lateral compliance.

As shown in FIGS. 9 and 10, each of the sliding bases 91-1 to 91-3 and the pressure base 93 is also provided with longitudinal rails 91a and 93a extending in the lateral direction.
The first substrates 91b and 93b are placed on 93a.
The first board 91b / 93b is provided with a second board 91c / 93c having a downward compliance, and bearings 91g / 93g is further rotatably held on the first board 91b / 93b by a bearing 91g / 93g so as to be compliant with the spring pin 91y / 93y. And third substrates 91d and 93d having The first board 91b of each of the slides 91-1 to 91-3 is elastically held in the lateral position by a pair of spring pins 91x facing each other in the lateral direction which is the sliding direction. A lateral compliance amount is regulated by stoppers 91z set at predetermined intervals on both left and right end surfaces of the first substrate 91b. Further, the first board 93b of the pressure table 93 is provided with lateral compliance by spring pins 93x facing each other with the bracket 93f interposed therebetween, and the range thereof is regulated by a stopper 93z. Further, pressure pieces 99 are provided to face the first substrate 90b of the fixed base 90 and the first substrate 93b of the pressure base 93, respectively. On the surfaces of the pressing pieces 99 facing each other, a laterally elongated cutout window 99a opening to the third substrate 90d / 93d side.
Is provided. A cylinder 93e for advancing and retracting the first substrate 93b is fixed to the rail 93a of the pressure table 93. Also, the third substrates 90d and 93d on both sides in the juxtaposed direction
The end holders 95 and 97 are held by the clamper 100, and the cam holders 96-1 to 96-3 are respectively located on the common hole axis on the third substrate 91d of the intermediate three machines, together with the bearing holes 96a and 96b. Is clamped as.

Next, the work procedure at station B will be described. First, each of the rocker arm units 3a
Each chuck 82 holding 3b is lowered between the pressing piece 99 and each of the cam holders 96a to 96c so that the common axis of the dummy shafts 5 and 6 and the common hole axis of each of the bearing holes 96a and 96b coincide with each other (Fig. 13 (a)). Next, the cylinder 72 of the loader 7 and the cylinder 92 of the assembly table 9
・ By operating 94 and each loader unit 8
-1 to 8-4 is shifted to the rear in the horizontal direction and the slide base 9
1 and the pressure base 93 are horizontally shifted to the fixed base 90 side, and the shaft end of the dummy shaft 5 is first inserted into the bearing hole 96a. At this time, even if the hole axes of the bearing holes 96a and 96b and the axis lines of the dummy shafts 5 and 6 do not match, the shaft end of the dummy shaft 5 is inserted into the bearing holes 96a, so that the cam holder 96 of the cam holder 96 can be adjusted based on each compliance. The position is corrected, whereby the shaft end of the dummy shaft 6 held in a predetermined relative positional relationship with the dummy shaft 5 via the chuck 82 is smoothly inserted into the bearing hole 96b (FIG. 13B). ). If at least both axial ends of the dummy shaft 5 are tapered, the tapered portions serve as guides and the dummy shaft 5 can be surely inserted into the bearing hole even if there is some error in the positioning by the loader 7.

Next, the two inner loader units 8-2
The chuck 82 of 8-3 was detached upward, and the detached 2
After the chuck claw 81 of the chuck 82 of the machine has been removed, the gap between the cam holders 96 is further narrowed, and then the rocker arm shafts 5L and 6L are oscillated and rotated around the axis by the operation of the cylinder 52 while the cylinder 53 is operated. The insertion table 51 is moved to the assembly table 9 side, the rocker arm shafts 5L and 6L are inserted into the bearing holes 96a and 96b, and the dummy shafts 5 and 6 are pushed out to the shooter 98 (FIG. 13C). Next, the fixed base 90 and the first base plates 90b and 93b of the pressurizing base 97 are retracted to separate the shaft ends of the rocker arm shafts 5L and 6L from the notches 99a of the pressurizing piece 99 and replace the pressurizing piece 99. End holder 95
-Match 97 with the center line CL (Fig. 13 (d)). Then, the cam holders 96 and the end holders 97 are further moved to the end holder 95 side so that both shaft ends of the rocker arm shafts 5L and 6L are supported in the bearing holes 95a, 95b and 9, respectively.
7a and 97b, and subsequently, the chucks 82 of the loader units 8-1 and 8-4 of the two outer machines are lifted, and then the gaps corresponding to the thickness of the chuck claws 81 of the two lifted machines are filled. This completes the rocker arm assembly.

[0017]

According to the present invention, a rocker arm unit is assembled by inserting a dummy shaft longer than the distance between the facing side surfaces of two holder members adjacent to each other into a member such as a rocker arm, and the holder member is based on the dummy shaft. Since the rocker arm is positioned with respect to the rocker arm, each member can be accurately positioned, and the rocker arm shaft does not interfere with the member when the rocker arm shaft is inserted and replaced with the dummy shaft. The member can be reliably supported on the rocker arm shaft.

[Brief description of drawings]

1 is a layout diagram showing the layout of each station

FIG. 2 is a plan view of station A.

FIG. 3 is a sectional view taken along line III-III

FIG. 4 is a front view of the loader

FIG. 5: Side view of loader

FIG. 6 is a plan view of station B

FIG. 7 is a front view of station B

FIG. 8 VIII-VIII sectional view

[Figure 9] IX-IX cross section

[Figure 10] XX sectional view

[Figure 11] XI-XI cross section

FIG. 12 is a diagram showing a standby state of the rocker arm.

FIG. 13 is a diagram showing details of a rocker arm assembling process.

FIG. 14 is a diagram showing a completed assembly state.

[Explanation of symbols]

1 1st slide table 2 pallet 4 2nd slide table 5 dummy shaft 6 dummy shaft 7 loader 8 loader unit 9 assembly table 31 (exhaust side) rocker arm 32 (intake side) rocker arm 3a, 3b rocker arm unit 96 cam holder 95/97 End holder

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[Procedure amendment]

[Submission date] May 27, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

Claims (1)

[Claims] 1. A method of arranging a plurality of holder members in parallel at a predetermined pitch, and assembling a rocker arm so as to be axially supported by a rocker arm shaft penetratingly supported across the plurality of holder members, wherein the rocker arm is mounted on the rocker arm. A step of assembling a rocker arm unit by inserting a dummy shaft longer than a space between opposing side surfaces of two adjacent holder members, and the rocker arm between the temporarily set holder members with a space wider than the predetermined pitch. The step of setting the unit so that the dummy shaft of the rocker arm unit matches the hole axis of the bearing hole for the rocker arm shaft formed in each holder member, and the interval of each holder member is narrowed to the above-mentioned predetermined pitch. , The step of inserting the end of the dummy shaft into the bearing hole, and from the holder member side at one end in the parallel installation direction By inserting the rocker arm shaft to Uketamawaana, assembling method of the rocker arm, characterized by a step of extruding the dummy shaft from the holder member side of the arrangement direction other end.