JP2729739B2 - Shaft insertion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft insertion device for inserting a rocker arm shaft into a holder member, which is used, for example, when automatically assembling engine parts.

[0002]

2. Description of the Related Art When automatically assembling engine parts,
It is necessary to insert the rocker arm into a bearing hole provided in a cam holder which is a holder member. In such a case, for example, according to Japanese Patent Application No. 4-1299000, a cam holder having a bearing hole into which a rocker arm shaft is inserted is provided.
A horizontal guide perpendicular to the axis of the bearing hole is slidably set on a holding table having horizontal compliance, and a rocker arm shaft is inserted into the bearing hole. Are known.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
Because of the gap generated between the horizontal guide and the holding table provided for providing horizontal compliance, the holding table has a compliance swinging around a horizontal axis parallel to the horizontal guide. When the rocker arm shaft is inserted in this state, if the tip of the rocker arm shaft comes into contact with the opening of the bearing hole, a slight deviation between the axis of the bearing hole and the axis of the rocker arm shaft or friction between the bearing hole and the rocker arm shaft will occur. For example, the rocker arm shaft pushes the cam holder, and the cam holder tilts to the opposite side to the rocker arm shaft. Then, since the axis of the bearing hole is inclined with respect to the axis of the rocker arm shaft, the tip of the rocker arm shaft is caught in the bearing hole, and further the cam holder is inclined, so that the rocker arm shaft cannot be inserted any more.

[0004] Incidentally, it is conceivable to increase the holding rigidity between the horizontal guide and the holding table so as not to provide compliance about an axis parallel to the horizontal guide, but in this case, the holding table is provided with a cam holder. If the axis of the bearing hole is displaced from the axis of the rocker arm shaft when setting
Conversely, there may be cases where the rocker arm shaft cannot be inserted due to lack of compliance.

[0005] In view of the above problems, the present invention provides a shaft insertion device capable of securely inserting a rocker arm shaft into a bearing hole while ensuring compliance around an axis perpendicular to the axis of the bearing hole. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to provide a member having a bearing hole around an axis orthogonal to a plane including the axis of the bearing hole at a position offset from the axis. In a shaft insertion device that is held by a holding table having compliance and inserts a shaft along the axis of the bearing hole, the posture of the above member at a neutral position is adjusted such that the axis of the bearing hole is aligned with the axis of the shaft. A means is provided for holding the apparatus in an inclined position inclined at a predetermined angle toward the offset side of the orthogonal axis toward the rear in the insertion direction.

[0007]

The operation of the present invention will be described with reference to FIG. 15. When the shaft RS is inserted into the bearing hole EH of the member EF on the holding base d having compliance about an axis h perpendicular to the plane of the drawing, the shaft RS For the axis α of RS, the bearing hole EH
Is inclined by a predetermined angle θ,
At the start of insertion, the shaft RS comes into contact with the upper edge of the bearing hole EH. And the shaft RS has the bearing hole E
The member EF is raised by pressing the upper edge of H, and the shaft RS is smoothly inserted into the bearing hole EH when both axes α and β coincide with each other. Since the two axes α and β always coincide with each other while the member EF is raised, the shaft RS is securely inserted into the bearing hole EH.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a rocker arm assembling apparatus in a so-called four-cylinder one-cam four-valve engine will be described. In the case of the present embodiment, as shown in FIG. 14, end holders EF1 and EF2 at both ends and a first cam holder CF1 and a second cam holder CF disposed therebetween.
Exhaust-side and intake-side rocker arm shafts RS supported in parallel with each other across the second and third cam holders CF3
A rocker arm IR on the intake side and a wave washer SP for holding the position of the rocker arm IR in the axial direction.
1, the rocker arm ER on the exhaust side and the rocker arm E
The spring SP2 that holds the axial position of R is assembled so as to support the through shaft. The rocker arm shaft RS is inserted into and supported by a bearing hole CH formed by a pair of through holes provided in each of the first to third cam holders CF1 to CF3, and each opposing surface of each of the end holders EF1 and EF2. Are supported by non-penetrating bearing holes EH provided in each pair, and the position in the longitudinal direction is regulated.

Referring to FIG. 1, reference numeral 1 denotes an assembling device for automatically assembling the respective rocker arms IR and ER in the state shown in FIG.
R / IR and spring SP2 / wave washer SP
1 is supported on each dummy shaft DS which is slightly thinner than the rocker arm shaft RS and is longer than the gap between the opposing side surfaces of the holders EF2 and CF1 to CF3 and EF1 by a predetermined length. The rocker arm units IY and EY are assembled at a different place outside the figure, and the rocker arm units IY and EY are transported to the assembly device 1 by the transport loader L. Then, in the assembling device 1, the first to the first to be arranged in parallel at a wider pitch than the interval at the time of completion of the assembling.
After the above units are set between the third cam holders CF1 to CF3 and on both sides in the juxtaposition direction, the gap between the cam holders CF1 to CF3 is narrowed, and the shaft end of the dummy shaft DS is once inserted into the bearing hole CH. 1 waiting on the extension of the first to third cam holders CF1 to CF3 in the juxtaposition direction
A pair of rocker arm shafts RS are inserted into the respective shaft bearing holes CH to replace them with the dummy shafts DS, and then both ends of each rocker arm shaft RS are attached to the end holder EF1.
-Insert into each shaft bearing hole EH of EF2 to complete the assembly.

The transport loader L is provided with a longitudinal arm LR that reciprocates along a guide frame LL erected laterally over the assembling device 1. , As shown in FIG. 2 and FIG.
The fourth loader units L1 to L4 were slidably supported in the front-rear direction. The loader units L1 to L4 are connected to each other via a cylinder LS, and the loader unit L1 located at the rear end in the juxtaposition direction is connected to the main body of the loader L via the cylinder LS.

Each of the loader units L1 to L4 has rocker arm units EY and IY for the exhaust side and the intake side of each cylinder.
The chuck LC for gripping is vertically movable by a cylinder LE, and is rotatable 90 degrees around a vertical axis by an air motor EM. The chuck LC is a pair of clamp pieces LA that grip the rocker arm units EY and IY on the exhaust side and the intake side on each dummy shaft DS.
Are provided in the axial direction of the dummy shaft DS, two of the two pairs of clamp pieces LA are urged inward by a spring ASa, and the two inner pieces are both biased. The dummy shaft DS is urged outward by the spring ASb contracted in between, and the respective dummy shafts DS are gripped by the urging forces of the springs ASa and ASb. The chuck LC was urged upward by a spring (not shown) to provide compliance with the downward direction.

In this embodiment, the loader unit L1
・ Each rocker arm unit IY ・ EY in the state shown in L2
, Each chuck LC is turned by the air motor EM, and each loader unit L1 to L4 is moved to L3 in FIG.
In the state shown in L4, the dummy shafts DS held by the chucks LC are aligned with the common longitudinal axis in the front-rear direction on the intake side and the exhaust side, respectively. To the top.

The assembling apparatus 1 is provided with an assembling table 1a located at the front, and behind the assembling table 1a, a pair of rocker arm shafts RS is held by a shaft insertion table 1b slidable in the front-rear direction. .

As shown in FIGS. 4 and 5, a fixed base 10 for fixing the end holder EF1 is provided at the rear end of the assembling table 1a. First to third slide tables 11-1 for setting cam holders CF1 to CF3 and end holder EF2, respectively.
11 to 13 and the pressure table 13 are slidably mounted in the front-rear direction. The sliding tables 11-1 to 11-3 are sequentially connected in series to the fixed table 10 via the cylinder 12, and the pressing table 13 is directly connected to the main body of the assembly table 1a. They are connected via a cylinder 14.

Each of the slide tables 11-1 to 11-3 has the same structure. When the slide tables 11-1 are used as an example, as shown in FIG. 11a is laid, and the first substrate 11b is placed on the rail 11a. The first substrate 11b includes a second substrate 11c having a downward compliance, and a third substrate 11d further rotatably held about a vertical axis CE by a bearing 11g and having compliance by a spring pin 11y. Is provided. Note that the first substrate 11b is elastically held in the lateral direction by a pair of spring pins 11x facing each other in the sliding direction, that is, in the sliding direction, and is provided by stoppers 11z arranged in parallel with the spring pins 11x. The lateral compliance amount is regulated.

The structures of the fixed table 10 and the pressure table 13 are symmetrical to each other, and as shown in FIGS. 6, 8, 9 and 11, the rails 10a and 13a are elongated in the lateral direction. Are laid, and the first substrates 10b and 13 are slid on the rails 10a and 13a by cylinders 10e and 13e.
b are provided, and on the first substrates 10b and 13b, there are provided rotating brackets 10c and 13c which are held by bearings 10g and 13g and are rotatable around a vertical axis CE. At the upper end of 13c, the second bases 10d and 13d are swingably connected via horizontal rotation shafts 10h and 13h. The rotating brackets 10c and 13c are paired with a pair of spring pins 10.
It is held at a neutral position in the rotation direction by y · 13y, and compliance is provided in both rotation directions. On the other hand, the second bases 10d and 13d are urged by a pair of springs 10i and 13i in directions in which the end holders EF1 and EF2 swing toward the first to third cam holders CF1 to CF3, respectively. The shafts of the shaft bearing holes EH of the EF2 are in contact with the stoppers 10j and 13j in a state where they are inclined at a predetermined angle in a direction in which they descend toward the first to third cam holders CF1 to CF3. Stopper 10
j · 13j are attached to the rotating brackets 10c · 13c, and stoppers 10k · 13k that regulate the second bases 10d · 13d from swinging in the opposite direction to the biasing direction by the springs 10i · 13i. The first base 1 is separated from the second base 10d / 13d by a predetermined distance.
0b and 13b. Thereby, the second base 1
0d and 13d are provided with a compliance that swings around the axis of the rotation shafts 10h and 13h, and the amount of compliance is regulated by both stoppers 10j and 10k and 13j and 13k. Further, taking the fixed base 10 as an example, FIG.
Bracket 1 connected to the first substrate 10b as shown in FIG.
0f is pinched by a pair of spring pins 10x opposed to the cylinder 10e in the sliding direction of the first substrate 10b,
Compliance is provided in the sliding direction, that is, the lateral direction from the sandwiched position. In order to restrict the movable range due to the lateral compliance, a pair of stoppers 1 are provided with a predetermined amount of clearance with respect to the bracket 10f.
0z is set. Also, the first substrate 1 of the fixing base 10
0b and the first substrate 13b of the pressing table 13
9 are provided to face each other, and a horizontally long cutout window 19a opened to the second substrate 10d / 13d side is provided on the opposing surface of the pressing piece 19. Then, the second substrate 10d
・ 13d is equipped with end holders EF1 and EF2 as clamper 1.
00, and cam holders CF1 to CF3 are respectively provided on the third substrates 10d of the three intermediate machines, with the respective bearing holes CH · EH.
Both are held by the clamper 100 so as to be located on the common axis.

Next, an operation procedure in the assembling apparatus 1 will be described with reference to FIG. First, each chuck LC holding each of the rocker arm units EY and IY is pressed into the pressing piece 1.
9 and each of the cam holders CF1 to CF3, and the common axis of the dummy shaft DS and each of the shaft bearing holes CH
(FIG. 13A). Next, by operating the cylinder LS of the loader L and the cylinders 12 and 14 of the assembly table 1a, the loader units L1 to L4 are shifted rearward in the horizontal direction, and first, the shaft end of the dummy shaft DS is connected to the bearing hole CH. To be inserted. At this time, the dummy shafts DS are simultaneously inserted into the bearing holes CH of the cam holders CF1 to CF3 from both sides in the front-rear direction.
-CF3 is not inclined in the front-rear direction.
Even if the axis of each bearing hole CH does not coincide with the axis of the dummy shaft DS at the time of this insertion, if the shaft end of the dummy shaft DS is inserted into the bearing hole CH, the position of the cam holder 16 will be based on each compliance. The shaft end of the dummy shaft DS, which has been corrected and held in a predetermined relative positional relationship with the dummy shaft DS via the chuck LC, is smoothly inserted into the bearing hole CH (FIG. 13B). If at least both shaft ends of the dummy shaft DS are tapered, the tapered portion serves as a guide so that the dummy shaft DS can be reliably inserted into the bearing hole even if there is some error in positioning by the loader L.

Next, the two inner loader units L2.
The chuck LC of L3 is detached upward, and the detached 2
After the gap between the cam holders 16 is further reduced by the thickness of the chuck claws LA of the chuck LC of the machine, the operation of the cylinder 22 is performed while the rocker arm shaft RS is swung about the axis by the operation of the cylinder 21 shown in FIG. To move the shaft insertion table 1b to the assembly table 1a side,
The rocker arm shaft RS is inserted into each shaft receiving hole CH, and each dummy shaft DS is pushed out to the shooter 18 (FIG. 13C). Next, the first of the fixed table 10 and the pressure table 13
Notch 19a of pressure piece 19 by retracting substrates 10b and 13b
The end of the rocker arm shaft RS is removed from the inside, and the end holders EF1 and EF2 are made to coincide with the center line CL instead of the pressing pieces 19 (FIG. 13D). Then, the respective cam holders CF1 to CF3 and the end holder EF2 are further moved toward the end holder EF1, and both shaft ends of the respective rocker arm shafts RS are inserted into the respective bearing holes EH. L4 chuck L
After raising C, gaps corresponding to the thicknesses of the two raised chuck claws LA are reduced, thereby completing the assembly of the rocker arm.

Further, as shown in the above-mentioned operation, the end of the rocker arm shaft RS is fixed to each end holder EF1.
・ When inserting into the bearing hole EH of EF2,
Is inclined at a predetermined angle with respect to the axis of the rocker arm shaft RS as described above.
The shaft end of the shaft S contacts the upper edge of the bearing hole EH, and is pushed by the shaft end of the rocker arm shaft RS so that each end holder EF1
The EF 2 swings outward in the juxtaposition direction around the rotation shafts 10h and 13h against the biasing force of the springs 10i and 13i. Then, during this swinging, the axis of the bearing hole EH coincides with the axis of the rocker arm shaft RS, and the rocker arm shaft RS is no longer caught in the bearing hole EH, so that the rocker arm shaft RS is smoothly inserted into the bearing hole EH thereafter. Inserted. At this time, since the rocker arm shaft RS is held by the first to third sliding bases 11-1 to 11-3 having the vertical compliance, the rocker arm shaft RS is provided with the fixed base 10 and the pressing base 13 in the vertical compliance. However, no problem arises even if it is not provided.

[0020]

As is apparent from the above description, according to the present invention, the shaft can be reliably inserted into the bearing hole of the member held on the holding table. For example, the rocker arm shaft is provided on the holder member. If it is applied when it is inserted into the shaft bearing hole, the parts of the engine can be automatically assembled.

[Brief description of the drawings]

FIG. 1 is a layout diagram showing an arrangement of an assembling device and a transport loader.

FIG. 2 is a front view of a loader.

FIG. 3 is a side sectional view of the loader.

FIG. 4 is a plan view of an assembly table portion of the assembly device.

FIG. 5 is a front view of an assembly table portion of the assembly device.

FIG. 6 is a sectional view taken along line VI-VI.

FIG. 7 is a sectional view taken along the line VII-VII.

FIG. 8 is a sectional view taken along the line VIII-VIII.

[FIG. 9] IX-IX sectional view

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

FIG. 11 is a cross-sectional view of XI-XI

FIG. 12 is a plan view of a shaft insertion table portion of the assembling device.

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

FIG. 14 is a diagram showing an assembled state.

FIG. 15 is a configuration diagram illustrating an operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Assembling apparatus 1a Assembling table 1b Shaft insertion base 10 Fixed base 11-1 First sliding base 11-2 Second sliding base 11-3 Third sliding base 13 Pressing base 10h, 13h Rotating shaft 10i・ 13i Spring 10j ・ 13j Stopper 10k ・ 13k Stopper L Loader RS Rocker arm shaft CH Shaft bearing hole EH Shaft bearing hole IR ・ ER Rocker arm CF1, CF2, CF3 Cam holder EF1, EF2 End holder

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor, Mitsuaki Inate 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (56) References JP-A-4-129625 (JP, A) 58-70836 (JP, U)

Claims (1)

(57) [Claims] A member having a bearing hole is held on a holding table having compliance around an axis orthogonal to a plane including an axis of the bearing hole at a position offset from the axis, and the bearing hole has a bearing hole. In the shaft insertion device that inserts a shaft along an axis, the posture of the above member at the neutral position is set such that the axis of the bearing hole is offset from the axis perpendicular to the axis of the shaft in the insertion direction rearward with respect to the axis of the shaft. A shaft insertion device provided with a means for maintaining an inclined posture such that the shaft is inclined at an angle.