JP2515666B2 - Rocker arm assembly method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention According to the present invention, a plurality of holder members are arranged side by side at a predetermined pitch, and two sets of rocker arms, one on the intake side and one on the exhaust side, are adjacent to each other between the holder members. The present invention relates to a method of assembling so that a short rocker arm shaft supported at both ends by a holder member and a long rocker arm shaft that penetrates and supports the other set of rocker arms straddling the plurality of holder members.

[0002]

2. Description of the Related Art When forming a plug hole for attaching a spark plug to a holder member supporting a rocker arm, the rocker arm shaft pivotally supporting one set of the intake side and the exhaust side avoids interference with the spark plug. For this reason, both ends of the short shaft may be supported by two adjacent holder members. Usually, in this case, the rocker arm shaft that pivotally supports the other set of rocker arms does not cause interference with the ignition plug, so it is configured with a long shaft that is penetratingly supported across all holder members, and therefore each holder member is A second bearing hole consisting of a first bearing hole for the short rocker arm shaft and a through hole for the long rocker arm shaft is formed in the.

Conventionally, as a method of assembling two such rocker arms, according to Japanese Patent Laid-Open No. 1-103242, one of the above-mentioned one set is provided between holder members that are provisionally set with a wider space than in the completed state. The rocker arm and the wave washer that holds the axial position of the rocker arm are provided with a rocker arm unit that is a small set by inserting a short rocker arm shaft, and the other set of rocker arms and a spring that holds the axial position of the rocker arm. Are set individually on a jig for receiving these members, and are then interposed, then the intervals of the holder members are narrowed to a predetermined pitch, and the end of the short rocker arm shaft is inserted into the first bearing hole. A long rocker arm shaft is inserted from the holder member side at one end in the parallel installation direction into the second bearing hole to form a rocker arm of the other set. Those in the pulling as inserting the elongate rocker arm shaft is known.

[0004]

In the above conventional method,
Since the other set of rocker arms and springs are individually 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 arms or springs, When the long rocker arm shaft is inserted, the concentricity with the spring cannot be ensured, and the shaft interferes with any one of these members, which may cause a rocker arm assembly error.

An object of the present invention is to provide a method for assembling a rocker arm which can minimize the occurrence of such an erroneous assembly.

[0006]

According to a first aspect of the present invention, a plurality of holder members are arranged in parallel at a predetermined pitch, and two rocker arms, one on the intake side and one on the exhaust side, are provided between each holder member. Rocker arms are pivotally supported by a short rocker arm shaft whose both ends are supported by two adjacent holder members, and a rocker arm of the other set is supported by a long rocker arm shaft penetratingly supported across the plurality of holder members. In the method of assembling as described above, the first rocker arm unit is assembled by passing the short rocker arm shaft through the rocker arm of the one set, and the space between the opposing side surfaces of the two holder members adjacent to the rocker arm of the other set is assembled. There is a step of assembling the second rocker arm unit by inserting a longer dummy shaft, and an interval wider than the above predetermined pitch. Between the set holder members, the first and second rocker arm units are provided, the short rocker arm shaft of the first rocker arm unit is formed in each holder member, and a hole shaft of a first bearing hole for the short rocker arm shaft is provided. 2 A step of setting the dummy shaft of the rocker arm unit so as to respectively match with the hole axis of the second bearing hole for the long rocker shaft, which is formed of a through hole formed in each holder member; Narrowing to a pitch, and inserting the end of the short rocker arm shaft and the end of the dummy shaft into the first and second bearing holes of the holder member, respectively; Inserting a long rocker arm shaft into the bearing hole and pushing out the dummy shaft from the holder member side at the other end in the juxtaposed direction. To.

According to a second aspect of the present invention, in this case, when the rocker arm units are set between the temporarily set holder members, the distance between the short rocker arm shaft and the dummy shaft is set to the first bearing hole. And the second shaft receiving hole are integrally held so as to have the same spacing as the second bearing hole, and the short length of the dummy shaft projecting from the rocker arm of the second rocker arm unit projects from the first rocker arm unit. Longer than the protruding length of, and when narrowing the space between each holder member,
The dummy shaft is inserted into the second bearing hole prior to the insertion of the short rocker arm shaft into the first bearing hole.

The invention according to claim 3 is further characterized in that the dummy shaft is inserted into the second bearing hole by using a taper portion formed at an axial end thereof as a guide.

[0009]

[Operation] A rocker arm or spring is pivotally supported by a dummy shaft in advance to form a rocker arm unit, the dummy shaft is once supported in a bearing hole, and then the original long rocker arm shaft is inserted into the bearing hole to form a dummy shaft. By replacing the rocker arm and the spring with the long rocker arm shaft, the concentricity between the rocker arm and the spring is secured, and when inserting the long rocker arm shaft, the shaft interferes with any of these members. No rocker arm assembly error will occur.

If the dummy shaft is inserted into the second shaft receiving hole prior to the insertion of the short rocker arm shaft into the first shaft receiving hole while the short rocker arm shaft and the dummy shaft are integrally held, the dummy shaft is inserted. Is inserted into the second bearing hole, the positional deviation of the short rocker arm shaft is corrected, and the short rocker arm shaft can be surely inserted into the first bearing hole.

Further, by providing a taper portion at the shaft end of the dummy shaft to serve as a guide when the dummy shaft is inserted into the first bearing hole, the dummy shaft is surely inserted into the second bearing hole even if the position of the dummy shaft is slightly displaced. Can be inserted.

[0012]

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 will be described.
The configuration of each station will be described in detail with the parallel 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 rocker arm set that can be pulled out forward, and a first slide table 1 that can move forward and backward in the lateral direction with the pallet 2 interposed therebetween. The second slide table 4 is arranged facing the second slide table 4. On the pallet 2, rocker arm mounting portions for three cylinders are juxtaposed at intervals in the front-rear direction. Each mounting portion has an exhaust-side rocker arm 31 assembled between the cam holders and a spring 33 therebetween. Are arranged in the horizontal direction and rough set, and the rocker arm 32 on the intake side and the wave washer 34 in the middle thereof are also roughly set adjacently in the front-rear direction.

A table 2 is provided on the first slide table 1.
The four work take-up parts 11 to 14 arranged in the front-rear direction corresponding to the respective placement parts are placed, and the first slide table 1 is raised and lowered by a cylinder 15a.
It is supported by the cylinder 1a so as to be advanced and retracted in the lateral direction. Each of the workpiece take-up portions 11 to 14 is formed in a tapered shape with a large tip, and is urged in the forward direction of the first slide table 1 by a spring. ~ 14
When the first slide table 1 is advanced 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 connected to the rocker arms 32 and the wave. It is inserted through 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 springs 33, and the wave washers 34 are removed from the pallet 2 with the rods 11a to 14a and 11b to 14b inserted. Be taken up. Each of the rods 11a to 14a and 11b
Since the tips 14b to 14b are largely tapered, even if the rocker arms 31 and 32, the springs 33 and the wave washers 34 are slightly displaced on the pallet 2, they can be picked up without fail. 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.
four pairs of pushers 41a-44 each facing on the axis of b
a and 41b to 44b are fixed. The pusher 4
Rods 11 are provided at 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 each of the pushers 41a-44a and 41b-4
4b, it moves and is pressed against the first slide table 1 side to be compressed to a predetermined dimension in the axial direction. By the way, the pusher 41a-44a has a dummy shaft 5
Each of the pushers 41b to 44b is loaded with a rocker arm shaft 6, and the dummy shaft 5 and the rocker arm shaft 6 are further moved by four pairs of pushing rods 45 provided on the second slide table 4 so as to be able to move forward and backward. It is pushed out to the first slide table 1 side. Then, each shaft comes into contact with 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. Note that tapered portions are provided at both axial ends of the dummy shaft 5, and the length of the dummy shaft 5 is slightly longer than the length of the rocker arm shaft 6 projecting from the rocker arm unit 3b. It is set to be long.

The loader 7 includes both stations A and B.
And a longitudinally extending arm 71 that reciprocates along a guide frame 70 erected so as to straddle the first to fourth loader units as shown in FIGS. 4 and 5. 8-1 to 8-4 are slidably supported in the front-rear direction. The loader units 8-1 to 8-4 are mutually connected to the cylinder 72.
The loader unit 8-1 located at the rear end in the juxtaposition 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 holding the rocker arm units 3a and 3b on the exhaust side and the intake side can be lifted 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 urged upward by a spring (not shown) to provide compliance with the downward direction.

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 forces of the springs 81a and 81b to clamp the shafts 5 and 6, and the rocker arm units 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 manner, the first and second slide tables 1
4 are retracted laterally outward, and then the chuck 82 is raised to a 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.
Is turned so that each loader unit is in a state of two machines as 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 length in the front-rear direction. Align with the axis. Then, in this state, the loader 7 is moved 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 second fixed base 90 is arranged 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 a pressure table 93 are slidably mounted in the front-rear direction. The sliding tables 91-1 to 91-3 are sequentially connected in series to the fixed table 90 via a cylinder 91, and the pressing table 93 is directly connected to the main body of the assembly table 9 in a larger size. They are connected via a cylinder 94.
As shown in FIG. 8, the fixed base 90 is provided with a first substrate 90b that is slidable along a rail 90a that is long in the horizontal direction, and is urged upward on the first substrate 90b. A second substrate 90c having a downward compliance is placed. And further, the second substrate 90c
A third substrate 90d, which is rotatably held around a vertical axis CE by a bearing 90g, is placed on the third substrate 90d. The third base 90d has a pair of spring pins 90y on one side end.
, It is held at a neutral position in the rotation direction, and compliance is provided in both rotation directions. The first substrate 90b is sandwiched by a pair of spring pins 90x opposed to the sliding direction of the first substrate 90b, and compliance is provided in the sliding direction, that is, the lateral direction from the sandwiched position. Note that a pair of stoppers 90z is provided with a predetermined amount of clearance from the first substrate 90b in order to regulate the movable range due to 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 placed. And the first substrate 91b.9
3b has a second substrate 91 having downward compliance.
c · 93c and bearings 91g · 93g on it
And third substrates 91d and 93d which are rotatably held around the vertical axis CE and have a compliance in the rotation direction by the spring pins 91y and 93y.
The first substrates 91b and 93b of the slide tables 91-1 to 91-3 and the press table 93 are moved in the horizontal direction by a pair of spring pins 91x and 93x that face each other in the slide direction. The first substrate 91 is provided with compliance.
The lateral compliance amount is regulated by stoppers 91z and 93z set at predetermined intervals with respect to the left and right end surfaces of b and 93b. Further, first and fifth cam holders 95-1 and 95-5 are provided on third substrates 90d and 93d of the fixed base 90 and the pressing base 93, and three slide bases 91-1 to 9-9 are provided.
Each of the third to third substrates 91d has the second to fourth cam holders 9 respectively.
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 respectively disposed on a common hole axis. It is positioned to be located.

Next, the work procedure at station B will be described. First, each rocker arm unit 3a
The chucks 82 holding 3b are lowered between the first to fifth cam holders 95-1 to 95-5 so that the common axis of each shaft 5 and 6 and the common hole axis of each bearing hole coincide with each other ( FIG. 12 (a)). Next, the cylinder 72 of the loader 7 is
By operating the cylinders 92 and 94 of the assembly table 9, the loader units 8-1 to 8-4 are shifted rearward in the horizontal direction, and the slide table 91 and the pressure table 93 are moved horizontally toward the fixed table 90. First, the shaft end of the dummy shaft 5 is inserted into the bearing hole 95a. At this time, even when the hole axis of each bearing hole does not coincide with the axis of each shaft, the first to fifth cam holders 95-1 are inserted based on the respective compliances by inserting the shaft end of the dummy shaft 5 into the bearing hole 95a. The positions of .about.95 @ -5 are corrected, whereby the shaft end of the rocker arm shaft 6 gripped in a predetermined relative positional relationship with the dummy shaft 5 via the chuck 82 is smoothly inserted into the bearing hole 95b ( FIG.
(B)). If both shaft ends of the dummy shaft 5 are tapered, the tapered portion serves as a guide to ensure that the dummy shaft 5 is inserted into the bearing hole even if there is some error in 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 chucks 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)).

[0024]

As is apparent from the above description, according to the present invention, since the rocker arm is positioned with respect to the holder member with reference to the dummy shaft which is previously inserted into the rocker arm, the holder member can be accurately positioned. By replacing the dummy shaft with a long rocker arm shaft, the rocker arm can be reliably supported by the long rocker arm shaft.

Further, since the dummy shaft is inserted into the bearing hole prior to the short rocker arm shaft to correct the position of the first rocker arm unit via the second rocker arm unit, the short rocker arm shaft is surely inserted into the first bearing hole. be able to.

Further, since the assembling is carried out by using the taper portions formed on both axial ends of the dummy shaft as guides, even if the position of the second rocker arm unit with respect to the holder member is slightly displaced, the both axial ends of the dummy shaft are surely moved to the first position. It can be inserted into the biaxial bearing hole.

[Brief description of drawings]

FIG. 1 is a layout diagram showing an arrangement of each station.

FIG. 2 is a plan view of station A.

FIG. 3 III-III cross-sectional view

FIG. 4 is a front view of the loader.

FIG. 5 is a side view of the loader.

FIG. 6 is a plan view of station B

FIG. 7 is a front view of station B.

FIG. 8 is a sectional view of VIII-VIII

[Figure 9] IX-IX cross section

FIG. 10 is a sectional view taken along line X-X

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

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

FIG. 13 is a diagram showing an assembled state.

[Explanation of symbols]

DESCRIPTION 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 Shaft bearing hole 95b Shaft bearing hole

Claims (3)

(57) [Claims] 1. A plurality of holder members are arranged side by side with a predetermined pitch, and two sets of rocker arms on the intake side and the exhaust side are provided between the respective holder members, and both ends of the two holder members to which one set of rocker arms are adjacent. A method of assembling a supported short rocker arm shaft and a long rocker arm shaft of the other set so as to be pivotally supported by a long rocker arm shaft penetratingly supported across the plurality of holder members. While assembling the first rocker arm unit by penetrating the short rocker arm shaft to the second rocker arm,
A step of assembling the second rocker arm unit by inserting a dummy shaft longer than the space between the facing side surfaces of the individual holder members, and the first and the first space between the holder members temporarily set with a space wider than the predetermined pitch. 2, both rocker arm units are formed with the hole shaft of the first shaft receiving hole for the short rocker arm shaft formed in each holder member by the short rocker arm shaft of the first rocker arm unit, and the dummy shaft of the second rocker arm unit in each holder member. The step of setting so as to respectively match the hole axis of the second bearing hole for the long rocker shaft formed of the through hole, and the interval between the holder members is narrowed to the above-mentioned predetermined pitch, and the short rocker arm shaft Inserting the end portion and the end portion of the dummy shaft into the first and second bearing holes of the holder member, and From the holder member side by inserting the elongate rocker arm shaft to the second Bearing hole, the method of assembling the rocker arm, characterized by a step of extruding the dummy shaft from the holder member side of the arrangement direction other end. 2. When the rocker arm units are set between the temporarily set holder members, the distance between the short rocker arm shaft and the dummy shaft is equal to the distance between the first bearing hole and the second bearing hole. The holders are integrally held so as to have the same spacing, and the protruding length of the dummy shaft protruding from the rocker arm of the second rocker arm unit is made longer than the protruding length of the short shaft protruding from the first rocker arm unit. The first of the short rocker arm shafts when narrowing the space between members
2. The rocker arm assembling method according to claim 1, wherein the dummy shaft is inserted into the second bearing hole prior to the insertion into the bearing hole. 3. The method of assembling a rocker arm according to claim 2, wherein the dummy shaft is inserted into the second bearing hole by using a taper portion formed at an axial end of the dummy shaft as a guide.