JPH06320362A - Assembly method for locker arm - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the assembly error of a locker arm by a method wherein positioning of a locker arm in a bearing hole is executed based on a shaft and a shaft is reliably inserted into the bearing hole. CONSTITUTION:A shaft having length longer than a distance between the sides, positioned opposite to each other, of the two adjoining cam holders out of cam holders 95-1-95-5 is inserted into a locker arm so as to assemble locker arm units 3a and 3b, which are set between the adjoining cam holders 95-1-95-5 with distances among them wider than a given pitch so that a shaft 5 is caused to coincide with the hole axis of the bearing hole. Distances among the adjoining cam holders 95-1-95-5 are reduced to a value equal to the given pitch, and the end part of the shaft 5 is inserted into the bearing hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocker arm assembling method in which a plurality of holder members are arranged side by side at a predetermined pitch and the rocker arms are assembled so as to be pivotally supported by a shaft supported by the plurality of holder members. .

[0002]

2. Description of the Related Art A holder member for supporting a rocker arm,
For example, a plug hole for attaching a spark plug may be formed, and in this case, so as not to interfere with the spark plug,
The rocker arm shaft that pivotally supports the rocker arm may be a short rocker arm shaft that is supported at both ends by adjacent holder members.

Conventionally, as a method of assembling a rocker arm using such a short rocker arm shaft, Japanese Patent Laid-Open Publication No. Hei 1-103242 discloses a method of mounting a rocker arm between holder members which are temporarily set with a wider space than that in a completed assembly state. A small rocker arm unit is formed by inserting a short rocker arm shaft into a rocker arm and a wave washer that holds the position of the rocker arm in the axial direction. It is known that the holder members are provided and then the intervals between the holder members are narrowed to have a predetermined pitch, and the ends of the short rocker arm shafts are inserted into the bearing holes provided in the holder members.

[0004]

SUMMARY OF THE INVENTION In the above conventional method,
Since the rocker arm unit is set on the jig and interposed between the holder members, if foreign matter such as dust is caught between the seat surface of the jig and the rocker arm, there will be a gap between the short rocker arm shaft and the bearing hole. The concentricity cannot be ensured, and when the distance between the holder members is narrowed to a predetermined pitch, the shaft may interfere with the holder member without entering the bearing hole, resulting in a rocker arm assembly error.

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

[0006]

According to the invention of claim 1, a plurality of holder members are arranged side by side at a predetermined pitch, and a rocker arm is pivotally supported by a shaft supported by the plurality of holder members. In the assembling method, a step of inserting a shaft longer than a space between the facing side surfaces of two adjacent holder members into the rocker arm to assemble a rocker arm unit, and each temporarily set with a space wider than the predetermined pitch. The step of setting the rocker arm unit between the holder members so that the shaft matches the hole axis of the bearing hole formed in each holder member, and the interval between the holder members is narrowed to the predetermined pitch, Inserting the end of the shaft into the bearing hole.

According to a second aspect of the present invention, in the first aspect of the invention, the two rocker arms of the intake side and the exhaust side are axially supported by respective shafts of the exhaust side and the intake side, respectively. Assemble the rocker arm unit with the exhaust side,
The shafts protruding from one set of rocker arms are held together while holding both units by holding both shafts at the same intervals as the bearing holes through which the intake and air side shafts are respectively inserted. When the length of the shaft protruding from the rocker arm of the other set is made longer and the distance between the holder members is narrowed, the insertion of one shaft into the bearing hole of the other shaft precedes the insertion into the bearing hole of the other shaft. It is characterized by having done.

According to the invention of claim 3, in the invention of claim 2, a tapered portion is formed at the shaft end of the one shaft, and the tapered portion is used as a guide to be inserted into the bearing hole. Characterize.

[0009]

[Function] The rocker arm and the spring are rotatably supported on the shaft to form a unit, which is positioned with respect to the bearing holes with reference to both ends of the shaft projecting at both ends of the unit. Therefore, the concentricity between the shaft and the bearing hole is determined. Can be secured.

Further, the rocker arm units on the intake side and the exhaust side are individually assembled, and the shafts of the respective units are gripped at the same intervals as the bearing holes into which the shafts of the respective units are inserted and the both units are integrally held. In addition, if the protruding length of one shaft is made longer than the protruding length of the other shaft, the concentricity between the other shaft and the bearing hole is automatically set when the one shaft is inserted into the bearing hole. Since it is ensured, only the concentricity between the one shaft and the bearing hole needs to be ensured. In this case, if a taper portion is provided at the shaft end portion of the one shaft, it serves as a guide when the taper portion is inserted into the bearing hole, and the concentricity of the one shaft and the bearing hole is accurately ensured. You don't have to.

[0011]

EXAMPLE An example in which the present invention is applied to assembling a rocker arm in a so-called 3-cylinder 1-cam 4-valve engine will be described. In the case of the present embodiment, as shown in FIG. 13, the long rocker arm shaft 5 supported across the first to fifth cam holders 95-1 to 95-5 is provided with the rocker arm 31 on the exhaust side and the rocker arm 31. A spring 33 that holds the axial position of 31 and a rocker arm 32 on the intake side on a short rocker arm shaft 6 supported at both ends by two adjacent cam holders and a wave washer 34 that also holds the axial position of the rocker arm 32. And so that they are respectively supported by through shafts. The rocker arm shaft 5 is inserted into and supported by a bearing hole 95a, which is a through hole provided in each of the first to fifth cam holders 95-1 to 95-5, and the rocker arm shaft 6 is mounted in the first to fifth cam holders 95-. Between each of 1 to 95-5, it is supported by a bearing hole 95b provided in each cam holder and not penetrating.

In this embodiment, as shown in FIG. 1, in the station A, the rocker arm 31 and the spring 33 on the exhaust side are made slightly thinner than the rocker arm shaft 5.
Also, the dummy shafts 5 each having a predetermined length longer than the space between the facing side surfaces of the holders 95-1 to 95-5 are pivotally supported, and the intake-side rocker arm 32 and the wave washer 34 are pivotally supported by the rocker arm shaft 6. The rocker arm units on the intake side and the exhaust side are assembled for each one supported between the cam holders, and each rocker arm unit subassembled at the station A is transported to the assembly station B by the transport loader 7. And the assembling station B
Then, from the state where the above-mentioned units are set between the first to fifth cam holders 95-1 to 95-5 which are preliminarily arranged side by side at a pitch wider than the interval at the time of completion of assembling, reduce the interval between the cam holders. Bearing holes 9 corresponding to the respective shaft ends of the dummy shaft 5
5a, and subsequently the shaft end of the rocker arm shaft 6 is inserted into the bearing hole 95b.
The rocker arm shaft 5 standing by on the extension of -1 to 95-5 in the arranging direction is inserted into the bearing hole 95a, which is a through hole, and this is replaced with each dummy shaft 5 to complete the assembly.

Hereinafter, the first to fifth cam holders 95-1 to 95-1 to
The configuration of each station will be described in detail with the parallel arrangement direction of 95-5 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 three cylinders are arranged in parallel with each other in the front-rear direction, and an exhaust side rocker arm 31 assembled between the cam holders and a spring 33 in the middle thereof are mounted on each mounting portion. Is arranged side by side in the rough direction, and the intake side rocker arm 32 and the wave washer 34 in the middle thereof are also arranged side by side in the rough direction so as to be rough set.

A table 2 is provided on the first slide table 1.
Workpiece upper portions 11 to 14 of four machines arranged in parallel in the front-rear direction corresponding to the respective mounting portions of the above are placed, and the first slide table 1 is lifted and lowered by a cylinder 15a.
It is supported on the upper side by a cylinder 1a so as to be moved forward and backward. Each of the work take-up portions 11 to 14 has its tip end portion formed into a large taper shape, and four pairs of movable rods 11a to 14a and 11b are urged by a spring in the forward movement direction of the first slide table 1. ~ 14
When b is mounted and 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 respective mounting portions, and similarly, the rods 11b to 14b are respectively in the rocker arms 32 and the wave. It is inserted into the washer 34. Then, when the first slide table 1 is raised by the operation of the cylinder 15a, the rocker arms 31 and 32, the spring 33 and the wave washer 34 are removed from the pallet 2 with the rods 11a to 14a and 11b to 14b inserted. Be taken up. In addition, each rod 11a-14a and 11b
Since the tip ends of ~ 14b are largely tapered, even if the rocker arms 31, 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, the second slide table 4 has rods 11a to 14a and 11b to 14 at the rising end position of the first slide table 1.
4 pairs of pushers 41a to 44, which are opposed to each other on the axis of FIG.
a and 41b to 44b are fixed. The pusher 4
A rod 11 is attached to the tips of 1a to 44a and 41b to 44b.
When the second slide table 4 is moved forward with the holes through which a to 14a and 11b to 14b are inserted and the first slide table 1 is at the rising end position, the rocker arms 31 and 32 and the springs 33. -The wave washer 34 is used for each rod 11a-14a and 11b-14b.
Along with the pushers 41a-44a and 41b-4
It is pushed by 4b to move, is pushed against the side of the first slide table 1 and is compressed to a predetermined size in the axial direction. By the way, the dummy shaft 5 is attached to the pushers 41a to 44a.
, And the rocker arm shafts 6 are respectively loaded on the pushers 41b to 44b. Further, the dummy shafts 5 and the rocker arm shafts 6 are moved by the four pairs of pushing rods 45 provided on the second slide table 4 so as to be movable back and forth. It is pushed out to the first slide table 1 side. Then, the respective shafts abut the rods 11a to 14a and 11b to 14b, and the rods 11a to 14a and 1
1b to 14b are pushed by the respective shafts to retreat against the biasing force of the springs, the dummy shafts 5 are inserted into the rocker arms 31 and the springs 33 on the exhaust side to form the rocker arm units 3a on the exhaust side, and Each rocker arm 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. It should be noted that the dummy shaft 5 is provided with taper portions at both axial ends thereof, and the dummy shaft 5 has a length which is slightly longer than the length of the rocker arm unit 3a protruding from the rocker arm unit 3b. It is set to be long.

The loader 7 includes both stations A and B.
It is provided with an arm 71 which is long in the front-rear direction and which reciprocates along a guide frame 70 which is installed so as to straddle the arm 71. The arm 71 has first to fourth loader units as shown in FIGS. 4 and 5. 8-1 to 8-4 were slidably supported in the front-rear direction. Each of the loader units 8-1 to 8-4 has a cylinder 72 mutually.
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.

In each of the loader units 8-1 to 8-4, a chuck 80 for gripping the rocker arm units 3a and 3b on the exhaust side and the intake side can be raised and lowered by a cylinder 84 and can be turned 90 degrees by an air motor 83. It is provided. The chuck 80 is provided with two pairs of clamp pieces 81 for gripping the rocker arm units 3a and 3b on the exhaust side and the intake side on the shafts 5 and 6, respectively, which are separated from each other in the axial direction of the shafts 5 and 6. Of the two pairs of clamp pieces 81 of each set, the outer two are urged inward by the spring 81a, and the inner two are urged outward by the spring 81b compressed between them.
The shafts 5 and 6 are gripped by the urging force of 1a and 81b. The chuck 82 was biased upward by a spring (not shown) to provide compliance downward.

When the small assembly 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 attached to the shafts 5 and 6. Contact both ends. When the chuck 82 is further lowered, the clamp claws 81 swing in the opening direction against the urging force of the springs 81a and 81b to clamp the shafts 5 and 6, and the rocker arm unit on the exhaust side and the intake side of each cylinder. 3a and 3b are held by each loader unit while maintaining a predetermined relative positional relationship. When the shafts 5 and 6 are clamped in this way, the first and second slide tables 1 ...
After both 4 are retracted laterally outward, the chuck 82 is raised to the state shown in the loader units 8-1 and 8-2 in the figure. Next, each chuck 82 is moved by the air motor 83.
Are rotated to bring the respective loader units into the two-machine state shown in 8-3 and 8-4 in the figure, and the dummy shafts 5 and the rocker arm shafts 6 held by the chucks 82 have a common longitudinal direction in the front-rear direction. Match the axis. Then, in this state, the loader 7 is moved to above the station B.

The station B is provided with an assembly table 9 located at the front and a shaft insertion base 51 located at the rear and slidable in the front-rear direction, and the rocker arm shaft 5 is mounted on the insertion base 51. Is held.

As shown in FIGS. 6 and 7, the assembly table 9 is provided with a fixed base 90 for setting the first cam holder 95-1 at the rear end thereof, and the fixed base 90 is provided with the fixed second base in order from the fixed base 90 toward the front. ~ First to third sliding bases 91 for setting the fourth cam holders 95-2 to 95-4 and the fifth cam holder 95-5, respectively
-1 to 91-3 and the pressure table 93 are 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 fixed base 90 is provided with a first substrate 90b which is slidable in a lateral direction along a long rail 90a, and is biased upward on the first substrate 90b. Thus, the second substrate 90c having a downward compliance is placed. Further, the second substrate 90c
A third substrate 90d rotatably held around a vertical axis CE by a bearing 90g is mounted on the. The third base 90d has a pair of spring pins 90y at one end.
Since it is sandwiched by, it is held in a neutral position with respect to the rotational direction, and compliance is provided in both rotational directions. The first substrate 90b is sandwiched by a pair of spring pins 90x facing each other in the sliding direction of the first substrate 90b, and the compliance is provided from the sandwiched position in the sliding direction, that is, the lateral direction. In addition, a pair of stoppers 90z are provided with a predetermined gap with respect to the first substrate 90b in order to restrict the movable range by the lateral compliance.

As shown in FIGS. 9 and 10, each of the slide bases 91-1 to 91-3 and the pressure base 93 also has a first substrate which is slidable along rails 91a and 93a which are long in the lateral direction. 91b
93b is mounted. And the first substrate 91b.9
3b has a second substrate 91 having downward compliance.
c · 93c and bearings 91g · 93g on it
Are provided so as to be rotatable around the vertical axis CE and provided with third substrates 91d and 93d having compliance in the rotation direction by the spring pins 91y and 93y.
The sliding bases 91-1 to 91-3 and the first substrate 91b of the pressurizing base 93 are moved laterally by a pair of spring pins 91x, 93x facing each other in the sliding direction. Compliance is given and the first substrate 91 is provided.
The lateral compliance amount is regulated by stoppers 91z and 93z which are set on the left and right end surfaces of b and 93b at predetermined intervals. Further, the first and fifth cam holders 95-1 and 95-5 are provided on the third substrates 90d and 93d of the fixed base 90 and the pressurization base 93, and the sliding bases 91-1 to 9-9 of the three machines.
Each of the second to fourth cam holders 9 is attached to the third substrate 91d of 1-3.
5-2 to 95-4 are clamped by the clamper 100, and the exhaust side bearing holes 95a and the intake side bearing holes 95b of the cam holders 95-1 to 95-5 are on the common hole axis. Positioned to be in position.

Next, the work procedure at the station B will be described. First, each of the rocker arm units 3a
Each chuck 82 holding 3b is lowered between each of the first to fifth cam holders 95-1 to 95-5 so that the common axis line of each shaft 5 and 6 and the common hole axis of each bearing hole are aligned with each other ( FIG. 12A). Next, the cylinder 72 of the loader 7
By operating the cylinders 92 and 94 of the assembly table 9 and the loader units 8-1 to 8-4, the loader units 8-1 to 8-4 are shifted rearward in the horizontal direction and the slide base 91 and the pressure base 93 are horizontally moved to the fixed base 90 side. After shifting, the shaft end of the dummy shaft 5 is first inserted into the bearing hole 95a. At this time, even if the hole axis of each bearing hole and the axis line of each shaft do not coincide with each other, the shaft end of the dummy shaft 5 is inserted into the bearing hole 95a, so that the first to fifth cam holders 95-1 based on each compliance. The positions of .about.95-5 are corrected, whereby the shaft end of the rocker arm 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 95b ( 12
(B)). If both shaft ends of the dummy shaft 5 are tapered, the dummy shaft 5 serves as a guide so that 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. it can.

Next, the chucks 82 of the four loader units 8-1 to 8-4 are separated upward, and the chuck claws 81 of the separated chucks 82 of the four machines are separated by the thickness of the chuck claws 81. After narrowing the interval (FIG. 12 (c)), the rocker arm shaft 50 is oscillated around the axis by the operation of the cylinder 52, and the shaft insertion base 51 is moved toward the assembly table 9 by the operation of the cylinder 53. Insert the rocker arm shaft 5 into the bearing hole 95a (see FIG. 12).
(D)) Each dummy shaft 5 is pushed out to the shooter 98, whereby the rocker arm assembly is completed (Fig. 12).
(E)).

In this embodiment, only the rocker arm on the intake side is pivotally supported on the short rocker arm shaft. However, instead of the dummy shaft, a short rocker arm shaft is used, and the rocker arm on the exhaust side is also supported. Similarly to the intake-side rocker arm, the short rocker arm shaft may be pivotally supported.

[0024]

According to the first aspect of the present invention, a rocker arm unit is assembled by inserting a 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 shaft is used as a bearing hole. Since the shaft is positioned with respect to the shaft, the shaft can be surely inserted into the bearing hole, and the rocker arm can be assembled correctly.

According to the second aspect of the invention, the shaft of one of the rocker arm unit on the intake side and the rocker arm unit on the exhaust side is inserted into the bearing hole prior to the shaft of the other unit. Since the shaft of the unit is positioned with respect to the bearing hole, both units can be positioned by positioning only one shaft with respect to the bearing hole. Further, at this time, as in the invention of claim 3, by providing a taper portion at the shaft end portion of the one shaft and using it as a guide when inserting the shaft into the bearing hole, it is possible to accurately position the one shaft. The rocker arm can be assembled securely.

[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

FIG. 11 is a diagram showing a standby state of the rocker arm.

FIG. 12 is a diagram showing details of a rocker arm assembling process.

FIG. 13 is a diagram showing an assembling completion state.

[Explanation of symbols]

1 1st slide table 2 pallet 4 2nd slide table 5 dummy shaft 6 rocker arm shaft 7 loader 8 loader unit 9 assembly table 31 (exhaust side) rocker arm 32 (intake side) rocker arm 50 rocker arm shaft 95-1 to 95-5 Cam holder 3a / 3b Rocker arm unit 95a Bearing hole 95b Bearing hole

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[Procedure amendment]

[Submission date] May 31, 1993

[Procedure Amendment 1]

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[Name of item to be corrected] Figure 6

[Correction method] Change

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[Figure 6]

[Procedure 3]

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[Correction method] Change

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[Figure 8]

[Procedure amendment 4]

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[Name of item to be corrected] Fig. 10

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[Figure 10]

Claims (3)

[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 shaft supported by the plurality of holder members,
A step of inserting a shaft longer than the distance between the facing side surfaces of two adjacent holder members into the rocker arm to assemble the rocker arm unit, and between each temporarily set holder member with a distance wider than the predetermined pitch. The step of setting the rocker arm unit so that the shaft matches the hole axis of the bearing hole formed in each holder member, and the interval between each holder member is narrowed to the above-mentioned predetermined pitch, and the end portion of the shaft Inserting the rocker arm into the bearing hole. 2. A rocker arm unit for an intake side and an exhaust side is assembled by pivotally supporting two sets of rocker arms on the intake side and the exhaust side on respective shafts for the exhaust side and the intake side, respectively. Side shafts are held at the same intervals as the bearing holes through which they are inserted to hold both units together, and the length of the shaft protruding from the rocker arm of one set is set to the length of the other set. It is longer than the protruding length of the shaft protruding from the rocker arm, and the insertion of one shaft into the bearing hole precedes the insertion into the bearing hole of the other shaft when the space between the holder members is narrowed. The method of assembling the rocker arm according to claim 1. 3. The method of assembling a rocker arm according to claim 2, wherein a taper portion is formed at the shaft end of the one shaft, and the taper portion is used as a guide to be inserted into the bearing hole.