JP2574196B2 - Rocker arm assembly method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a rocker arm in which a plurality of holder members are arranged side by side at a predetermined pitch, and a rocker arm is assembled so as to be 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 includes:
For example, a plug hole for mounting a spark plug may be formed. In this case, in order to prevent interference with the spark plug,
The rocker arm shaft that supports the rocker arm may be a short rocker arm shaft that is supported at both ends by each of the adjacent holder members.

Conventionally, as a method of assembling a rocker arm using such a short rocker arm shaft, Japanese Unexamined Patent Publication No. HEI 1-1103242 discloses a method in which a temporarily set holder member is provided at a wider interval than the assembly completed state. A rocker arm unit assembled by inserting a short rocker arm shaft through a rocker arm and a wave washer that holds the rocker arm in the axial direction is set on a jig for receiving and positioning the unit with reference to the outer surface of the rocker arm. It is known that the distance between the holder members is reduced to a predetermined pitch, and then the end of the short rocker arm shaft is inserted into a bearing hole provided in the holder member.

[0004]

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 seating surface of the jig and the rocker arm, the gap between the short rocker arm shaft and the shaft bearing hole is reduced. When the concentricity cannot be ensured, and when the interval between the holder members is narrowed so as to have a predetermined pitch, the shaft may not enter the bearing hole and interfere with the holder member, resulting in a mistake in assembling the rocker arm.

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 a rocker arm is provided.
In the method of assembling so as to be supported by a shaft supported by the plurality of holder members, the rocker arm includes:
Assembling the rocker arm unit by inserting a shaft longer than the gap between the opposing side surfaces of two adjacent holder members, and inserting the rocker arm unit between the temporarily set holder members with a gap wider than the predetermined pitch. ,
The shaft and each of the holder members are aligned so that the shaft coincides with the hole axis of a bearing hole formed in each of the holder members.
Is set so as to be relatively movable in the direction perpendicular to the axis, and the distance between the holder members is reduced to the predetermined pitch, and the end of the shaft is brought into contact with the bearing hole.
And positioning the shaft with respect to the bearing hole, and 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 present invention, two sets of rocker arms, an intake side and an exhaust side, are pivotally supported on separate shafts on the exhaust side and the intake side, respectively. And the rocker arm unit with the exhaust side,
The two protruding lengths of the shafts that protrude from one set of rocker arms while gripping both shafts and holding both units together with the same spacing as the bearing holes through which the intake-side and air-side shafts are inserted respectively. When the length of the shaft protruding from the other set of rocker arms is longer than that of the other set of rocker arms, and the distance between the holder members is reduced, the insertion of one shaft into the bearing hole precedes the insertion of the other shaft into the bearing hole. It is characterized by the following.

According to a third aspect of the present invention, in the second aspect of the present invention, a tapered portion is formed at the shaft end of the one shaft, and the tapered portion is inserted into a bearing hole using the tapered portion as a guide. Features.

[0009]

[Function] A rocker arm or a spring is previously supported on a shaft to form a unit , and the shaft and holder of the unit are formed.
Since the material is held so that it can freely move in the direction perpendicular to the axis,
When the shaft is applied to the bearing hole of the holder,
The positioning between the shaft and the bearing hole is dynamically performed , and concentricity between the shaft and the bearing hole is ensured.

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

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to the assembly of a rocker arm in a so-called three-cylinder one-cam four-valve engine will be described. In the case of the present embodiment, as shown in FIG. 13, an exhaust-side rocker arm 31 and the rocker arm 31 on the exhaust side are mounted on a long rocker arm shaft 50 supported over the first to fifth cam holders 95-1 to 95-5. a spring 33 for holding 31 the axial position of the rocker arm 32 of the intake side rocker arm shaft 6 of the short which is supported at both ends to two adjacent cam holders and also the rocker arm 3
2 and a wave washer 34 holding the position in the axial direction are assembled so as to be supported by the respective through shafts. The rocker arm shaft 50 has first to fifth cam holders 95-1 to 95-1.
95-5, which are through holes provided in each of the bearing holes 95-5
And the rocker arm shaft 6 is
Between each of the cam holders 95-1 to 95-5, it is supported by a non-penetrating bearing hole 95b provided in each cam holder.

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 slightly thinner than the rocker arm shaft 50 and between the opposing side surfaces of the holders 95-1 to 95-5. , And the rocker arm 32 and the wave washer 34 on the intake side are pivotally supported on the rocker arm shaft 6 so as to be supported between the respective cam holders. The rocker arm units assembled in the station A are transported to the assembly station B by the transport loader 7. Then, at the assembling station B, from the state where the above-described units are set between the first to fifth cam holders 95-1 to 95-5 arranged in parallel at a pitch wider than the interval at the time of completion of the assembling, After narrowing the interval between the cam holders, the shaft ends of the dummy shafts 5 are inserted into the corresponding bearing holes 95a, and then the shaft ends of the rocker arm shafts 6 are inserted into the bearing holes 95b.
The rocker arm shaft 50 waiting on the extension in the juxtaposition direction of 5-1 to 95-5 is inserted into the through hole 95a, and the dummy shaft 5 is replaced with each of the through holes 95a 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.

The first slide table 1 has a table 2
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, rods 11a to 14a and 11b to 14
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 advanced in a state where the first slide table 1 is at the rising end position, the rocker arms 31 and 32 and the springs 33 are provided with holes through which a to 14a and 11b to 14b can be inserted.・ Wave washers 34 are rods 11a to 14a and 11b to 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 and retracted against the urging force of the springs, and the respective dummy shafts 5 are inserted into the respective rocker arms 31 and the springs 33 on the exhaust side to form the rocker arm units 3a on the exhaust side. Each rocker arm shaft 6 is inserted through 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 is connected to both stations AB.
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, chucks 82 for holding the rocker arm units 3a and 3b on the exhaust side and the intake side can be moved up and down by a cylinder 84 and can be turned by 90 degrees by an air motor 83. Is provided. The chuck 82 is provided with two pairs of clamp pieces 81 which hold the rocker arm units 3a and 3b on the exhaust side and the intake side on the shafts 5 and 6, respectively, and are separated in the axial direction of the shafts 5 and 6. Of the two pairs of clamp pieces 81 of each set, the outer two pieces are urged inward by a spring 81a, and the two inner pieces are urged outward by a spring 81b contracted between the two.
The shafts 5 and 6 are gripped by the urging forces 1a and 81b. The chuck 82 was urged upward by a spring (not shown) to provide compliance with the downward direction.

When the small set of the rocker arm units 3a and 3b is completed in 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 firstly moved 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 driven by an 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 table 51 located at the rear and slidable in the front-rear direction. The insertion table 51 has a rocker arm shaft 50 mounted thereon. Is held.

As shown in FIGS. 6 and 7, the assembling table 9 is provided at its rear end with a fixed base 90 for setting the first cam holder 95-1. First to third slide tables 91 for setting the fourth to 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 sliding tables 91-1 to 91-3 and the pressing table 93 also has a first substrate slidable along rails 91a and 93a extending in the lateral direction. 91b
93b is placed. Then, the first substrate 91b ・ 9
3b is a second substrate 91 having a 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 operation procedure at the 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 detached upward, and the thickness of the detached chuck claws 81 of the four detached chucks 82 is further reduced by the thickness of each cam holder. After the distance is reduced (FIG. 12C), the shaft insertion table 51 is moved to the assembly table 9 side by the operation of the cylinder 53 while the rocker arm shaft 50 is oscillated about the axis by the operation of the cylinder 52. The rocker arm shaft 5 is inserted into the bearing hole 95a (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 intake side rocker arm is supported by the short rocker arm shaft. However, a short rocker arm shaft is used in place of the dummy shaft, and the exhaust side rocker arm is also used. Like the rocker arm on the intake side, the rocker arm may be supported by the short rocker arm shaft.

[0024]

[Effect of the Invention] The invention of claim 1, the members of the rocker arm or the like, assembling the rocker arm unit by inserting the elongate shaft than the spacing between the opposing sides of two adjacent holder members together, and the shaft and the holder member In the direction perpendicular to the axis
Hold the shaft in the bearing hole
Since the shaft is automatically positioned with respect to the bearing hole when it is stuck, the shaft can be reliably inserted into the bearing hole, so that the rocker arm is not erroneously assembled.

According to a second aspect of the present invention, the shaft of one unit 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 shafts of the units are positioned with respect to the bearing holes, both units can be positioned only by positioning one shaft with respect to the bearing holes. Further, at this time, as in the third aspect of the present invention, a tapered portion is provided at the shaft end of the one shaft and used as a guide when the one shaft is inserted into the bearing hole, so that one shaft can be accurately positioned. The rocker arm can be securely mounted.

[Brief description of the drawings]

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

FIG. 2 is a plan view of station A.

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

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

[FIG. 9] IX-IX sectional view

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 method for assembling a plurality of holder members arranged side by side at a predetermined pitch so that a rocker arm is supported by a shaft supported by the plurality of holder members.
Assembling the rocker arm unit by inserting a shaft longer than the distance between the opposing side surfaces of the two adjacent holder members into the rocker arm; and interposing the temporarily set holder members at an interval wider than the predetermined pitch. The rocker arm unit is adjusted so that the shaft coincides with a hole axis of a bearing hole formed in each holder member , and
Shaft and each holder member can move freely in the direction perpendicular to the axis.
And setting the distance between the holder members to be smaller than the above-mentioned predetermined pitch, so that the end of the shaft is
Apply the shaft to the bearing hole so that the shaft
Positioning the shaft and inserting the end of the shaft 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, an intake side and an exhaust side, on separate shafts for an exhaust side and an intake side, respectively. The two shafts are held together by holding both shafts at the same interval as the bearing holes through which the side shafts are inserted, and the projecting length of the shaft projecting from one set of rocker arms is set to the other set. The length of the shaft protruding from the rocker arm is longer than the length of the shaft, and when the distance between the holder members is reduced, the insertion of one shaft into the bearing hole precedes the insertion of the other shaft into the bearing hole. The method for assembling a rocker arm according to claim 1, wherein 3. The method of assembling a rocker arm according to claim 2, wherein a tapered portion is formed at an end of the shaft of the one shaft, and the tapered portion is used as a guide to be inserted into a bearing hole.