JP2001334430A - Asembling device of split collet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent the failure in assembling a split collet. SOLUTION: A jig 30 is composed of a housing 31 butted to a retainer 4, a first guide hole 33 allowing the split collet 6 to be entered into the housing, a slider 38 sliding in the first guide hole while pressed by the split collet and compressing a first spring means 36, a second guide hole 37 allowing a shaft part 2 to be entered into the slider, a guide pin 38 projecting from the second guide hole by a predetermined amount at its tip side insertable into the split collet, and sliding in the second guide hole while pressed by the shaft part from an initial position and compressing a second spring means 44, and an enlarged part 47 allowing the split collet to be opened and closed inside of the first guide hole in a state that a minimum inner part of the split collet entered into the first guide hole is placed on the shaft part entered into the second guide hole to be engaged with a minimum outer part of the shaft part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for assembling a split collet.

[0002]

2. Description of the Related Art For example, in an engine valve system, a split collet (split collar) fixes a valve (intake / exhaust valve) and a valve spring, and a taper of a retainer (valve upper seat) supporting the valve spring. It is fitted into the hole and attached to the valve stem by the shrinking reaction force of the valve spring.

A valve 1 is set on a cylinder head as shown in FIG. 13, and a valve spring 3 is arranged around a valve stem 2 protruding from an upper deck thereof. A valve upper seat 4 is placed on the valve spring 3, and a conical split collar 6 is fitted into the tapered hole 5. 7 is a valve lower seat, and 8 is a stem seal. JP-A-11-138366 and JP-A-6-238534 disclose a supply device for automatically dropping (fitting) a split collar into a valve upper seat on a valve spring.

[0004]

As a means for automatically mounting the split collar 6 on the valve stem 2 while compressing the valve spring 3 from such a set state (see FIG. 13), as shown in FIG. An assembling device having a simple configuration is conceivable. Reference numeral 11 denotes a mounting table for the cylinder head 10, and a receiving table 12 is provided above the mounting table. A predetermined number of jigs 1 are provided on the lower surface of the receiving table 12 (facing the upper surface of the mounting table 11).
3 are attached in a predetermined arrangement state. The installation table 11 is moved up and down by a predetermined stroke by a driving unit (not shown). 14a and 14b are switches for controlling the elevation of the mounting table 11.

[0005] The jig 13 is configured as shown in FIG. 1
Reference numeral 5 denotes a housing fixed to the lower surface of the receiving base 12 via a holder (not shown). A guide hole 17 for allowing the split collar 6 to enter the housing 15 is formed coaxially with the valve stem 2. You. Split color 6
And a spring 19 for urging the slider 18 to a predetermined initial position.
And are provided. The slider 18 has a large-diameter portion 18a forming a sliding surface with the guide hole 17 and a small-diameter portion 18b forming a housing space for the spring 19 between the guide hole 17 and the large-diameter portion 18a.
And formed from The spring 19 includes the slider 18
Is interposed between the boundary (step) between the large-diameter portion 18a and the small-diameter portion 18b and the locking portion set on the holder side.

[0006] A valve upper seat 4 on a valve spring 3 and a split collar 6 fitted in a tapered hole 5 of the valve spring 3 on the outer periphery of the tip (the end face on the side of the large diameter portion 18a) of the slider 18.
A stepped portion 20 that can be engaged with the stepped portion is formed, and an insertion hole 21 that allows the valve stem 2 to enter the inside of the slider 18 is opened in the end face of the stepped portion 20. Housing 15
On the lower surface of the valve upper seat 4 on the valve spring 3
Is provided coaxially with the slider 18 so that the valve upper seat 4 is easily received and positioned, and the inner periphery thereof is formed in a tapered shape whose diameter increases downward.

Reference numeral 26 denotes a screw hole for connecting the holder to the housing 15, and 27 denotes a rear end of the slider 18 (small diameter portion 18).
This is a screw hole for connecting a stopper plate (not shown, which restricts the slider 18 from falling off) to the not-shown stopper plate (the end surface on the side b).

After the setting of the valve 1, valve spring 3, valve upper seat 4, and split collar 6, etc., the cylinder head 10 is carried into the installation table 11.
When the installation base 11 is raised by the switch operation, the valve upper seat 4 enters the fitting recess 25 of the housing 15 and is positioned coaxially with the slider 18 as shown in FIG. On the other hand, the stepped portion 2 of the slider 18
Since 0 hits a step between the valve upper seat 4 and the split collar 6, the center of the split collar 6 coincides with the axis of the valve stem 2.

When the mounting base 11 is further raised, the valve collar 2 pushes up the split collar 6 and enters the guide hole 17 while resisting the contraction reaction force of the spring 19. Then, when the valve stem 2 hits the minimum inner diameter portion 6a (projection) of the split collar 6 and gets over it and enters the insertion hole 21, in the process, the split collar 6 is pushed open in the outer diameter direction, and FIG. When the valve stem 2 reaches the predetermined position as described above, the minimum inner diameter portion 6a is engaged with the minimum outer diameter portion 2a (groove) of the valve stem 2 by the contraction reaction force of the spring 19 for urging the split collar 6 in the inner diameter direction. Combine.

After that, the mounting table 11 is turned downward, and the split collar 6 is lowered integrally with the valve stem 2 while receiving the contraction reaction force of the spring 19, and is accommodated in the tapered hole 5 of the valve upper seat 4. Can be When the valve upper seat 4 is separated from the fitting recess 25 of the housing 15, the contraction reaction force of the valve spring 3 acts in the radial direction via the valve upper seat 4, so that the split collar 6 is fixed to the valve stem 2. . In addition,
Reference numeral 17a denotes an enlarged diameter portion of the guide hole 17, and the minimum inner diameter portion 6a of the split collar 6 is the minimum outer diameter portion 2 of the valve stem 2.
Movement of split collar 6 to engage with a (open / close)
Tolerate.

By the way, in such an apparatus, when the valve upper seat 4 abuts against the fitting recess 25 of the housing 15, the stepped portion 20 of the slider 18 shallowly engages with the step between the valve upper seat 4 and the split collar 6. Therefore, it is difficult to make the center of the split collar 6 coincide with the axis of the valve stem 2. In other words, since the center of the split collar 6 is hard to come out, the split collar 6 is not evenly pushed and opened by the valve stem 2, and FIG.
As described above, there is a possibility that the valve stem 2 is caught on a part of the split collar 6 and rises while sandwiching the valve stem between the split collar 6 and the split collar 6, which is likely to cause an assembly failure (eg, dropout). Can be considered.

An object of the present invention is to provide an effective countermeasure for improving such a problem.

[0013]

According to the first aspect of the present invention, a retainer mounted on a spring is fitted into a tapered hole,
In a split collet assembling device fixed to the outer periphery of a shaft portion by a contraction reaction force of a spring, two members vertically opposed to each other and means for reciprocating at least one of these members in the direction of expansion and contraction of the spring. And a jig attached to the other member using one of the two members as an installation table. The jig includes a housing that abuts a retainer, and a first jig that allows the split collet to enter the inside of the housing. A guide hole, a slider that slides through the first guide hole while being compressed by the split collet to compress the first spring means, a second guide hole that allows the shaft portion to enter the interior of the slider, and a second guide. A guide pin that slides through the second guide hole while being compressed by the shaft portion from the initial position where the tip end insertable into the split collet from the hole projects by a predetermined amount and compresses the second spring means. And the split collet is inserted into the first guide hole so that the minimum inner diameter portion of the split collet entering the first guide hole rides on the shaft portion entering the second guide hole and engages with the minimum outer diameter portion of the shaft portion. A diameter-enlarging portion that allows opening and closing by the opening.

According to a second aspect of the present invention, in the split collet assembling apparatus according to the first aspect of the present invention, the guide pin has a distal end side set to the same outer diameter as the minimum inner diameter portion of the split collet, and a distal end of which is spherical. It is characterized by being formed in a shape.

According to a third aspect of the present invention, in the split collet assembling apparatus according to the first aspect, the housing is provided with a fitting recess for positioning the retainer coaxially with the guide pin.

[0016]

According to the first aspect of the invention, when the two members approach each other due to the relative reciprocating motion between the two members, the leading end side of the guide pin is coaxial with the shaft in the process until the housing abuts the retainer. The top approaches the split collet which fits into the tapered hole in the retainer and enters through the smallest inside diameter of the split collet.

In the process in which the housing compresses the spring to a predetermined amount via the retainer, the valve stem enters the inside of the split collet and abuts against the tip of the guide pin to push up the guide pin, while the minimum inner diameter of the split collet is maintained. And push it up to a predetermined position while entering the first guide hole. While the contraction reaction force of the first spring means increases to a predetermined value, the shaft part gets over the minimum inner diameter part of the split collet and enters the second guide hole, thereby further compressing the second spring means.

At this time, the split collet is pushed open in the outer diameter direction against the contraction reaction force of the first spring means since the minimum inner diameter portion rides on the outer periphery of the shaft portion, and the shaft portion further has the second guide hole. , And reaches a predetermined position, the smallest inner diameter portion engages with the smallest outer diameter portion of the shaft portion by the first spring means for urging the split collet in the inner diameter direction.

If the contraction reaction force of the second spring means is larger than the contraction reaction force of the first spring means at a stage where the shaft portion has not yet entered the second guide hole, the slider is excessively pushed up by the shaft portion. Since it becomes difficult to assemble the split collet (engagement with the minimum outer diameter portion of the valve stem), the compression reaction force of the first spring means is set to be greater than the compression reaction force of the second spring means. .

Thereafter, the two members are turned back.
The split collet descends integrally with the shaft while receiving the compression reaction force of the first spring means, and is accommodated in the tapered hole of the retainer. When the retainer separates from the housing, the split collet held by the retainer is fixed to the minimum outer diameter portion of the shaft portion due to the contraction reaction force of the spring around the shaft portion.

In the process until the housing collides with the retainer, the displacement of the divided collet when fitted into the retainer is guided by the guide pin which enters through the minimum inner diameter portion of the divided collet coaxially with the shaft as described above. Since the correction can be performed with high precision, the split collet can be evenly pushed and opened on the shaft portion, and an effect of preventing an assembly error or an assembly failure of the split collet can be obtained.

In the second aspect, since the outer diameter of the guide pin is the same as the minimum inner diameter of the split collet, the centering function when the guide pin passes through the minimum inner diameter of the split collet can be maximized. In addition, since the tip of the guide pin is spherical,
Even if the displacement of the split collet is large, it can easily and smoothly enter the inside of the split collet.

In the third aspect, since the retainer is positioned in the fitting recess, the guide pin can be centered stably and accurately.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 11 denotes a mounting table for a cylinder head 10, and a receiving table is provided above the mounting table. A predetermined number of jigs 30 are mounted in a predetermined arrangement state on the lower surface of the receiving table (facing the upper surface of the installation table 11). When the switch is operated, the installation table 11 is moved up and down a predetermined stroke by a driving unit (not shown). Since the overall schematic configuration is the same as that of FIG. 12, the same components are denoted by the same reference numerals.

In the jig 30, reference numeral 31 denotes a housing, which is fixed to the lower surface of the receiving stand via a holder 32. Three
Reference numeral 3 denotes a first guide hole which passes through the inside of the housing 31 coaxially with the valve stem 2, and a through hole 34 communicating with the guide hole 33 is formed inside the holder 32. First
The split collar 6 (divided collet) is allowed to enter the inside of the housing 31 into the lower opening of the guide hole 33.

Reference numeral 35 denotes a slider slidable in the first guide hole 33, between the large diameter portion 35a forming a sliding contact surface with the first guide hole 33 and the first guide hole 33 and the through hole 34. Small-diameter portion 3 which forms a receiving space for the first spring 36
5b. The first spring 36 urges the slider 35 to a predetermined initial position, and a boundary (step) between the large diameter portion 35a and the small diameter portion 35b of the slider 35.
And a locking portion (not explicitly shown) set in the through hole 36 of the holder 32.

The slider 35 is provided with a second guide hole 37 for allowing the valve stem 2 to enter into the slider 35, and a guide pin 38 slidable in the second guide hole 37. As shown in FIG. 2, the guide pin 38 includes a flange portion 38a that forms a sliding portion with the second guide hole 37, a pin portion 38b that can enter the split collar 6, and a guide that can enter an insertion hole 39 described later. A second spring 44 is assembled around the shaft 38c. Pin part 38b
Is set to the same outer diameter as the minimum inner diameter portion 6a (projection) of the split collar 6, and its tip is formed into a spherical shape so that it can easily enter. Also, the rear end of the guide shaft 38c is inserted into the insertion hole 3.
9 and easily formed into a spherical shape.

FIG. 3 is a sectional view of a cylindrical member 40 forming a large diameter portion 35a of the slider 35, and FIG. 4 is a sectional view of a rod member 41 mainly forming a small diameter portion 35b of the slider 35. Reference numeral 40 denotes a through hole 40 a forming the second guide hole 37, a locking portion 40 b for regulating the initial position of the guide pin 38, and a female screw portion 4 for connecting the rod member 41.
0c. The rod member 41 is connected to the cylindrical member 40.
And a flange 41b (spring bearing) for engaging the second spring 44, and the insertion hole 39 of the guide shaft 38c is provided with a male screw 41a.
It is opened at the end face of. Further, a screw hole 41c for connecting the stopper plate 45 is formed at an end of the rod member 41 opposite to the male screw portion 41a.

The guide pin 38 is inserted into the cylindrical member 40 (through hole 40a) together with the second spring 44 from the female screw portion 40c side, and the female screw portion 40c of the cylindrical member 40 is formed.
By screwing the male screw portion 41a of the rod member 41 into the slider 35, the rod member 41 is housed inside the slider 35. The second spring 44 includes a flange 38 a of the guide pin 38 and the rod member 41.
At the initial position where the flange 38a of the guide pin 38 abuts the locking portion 40b of the cylindrical member 40 due to the urging force of the male screw 41a (around the insertion hole 39). The distal end side of the portion 38 b projects a predetermined amount from the end surface of the slider 35.

In FIG. 1, a fitting recess 46 for positioning the valve upper seat 4 coaxially with the valve stem 2 is provided on the lower surface of the housing 31 (the surface facing the mounting table 11), and the inner periphery thereof is provided with a valve upper seat. 4 is formed into a taper that is easy to receive and position, and that expands in diameter downward. 4
Reference numeral 7 denotes an enlarged diameter portion set in the first guide hole 33, which allows the split collar 6 to be pushed and opened by the valve stem 2. The stopper plate 45 is provided so that the slider 35
The slider 35 is connected to the rear end (the end face of the small diameter portion 35b) of the slider 35 by a bolt through the screw hole 41c of the rod member 41.

The mounting table 11 rises from the state of FIG. 1 (forward movement).
Then, as shown in FIG. 5, the housing 31 comes into contact with the fitting concave portion 46 while receiving the valve upper seat 4, and the valve upper seat 4 is positioned coaxially with the valve stem 2 in the fitting concave portion 46. In this process, the pin portion 38b of the guide pin 38 approaches the split collar 6 fitted on the tapered hole 5 of the valve upper seat 4 on the same axis as the valve stem 2 and further passes through the minimum inner diameter portion 6a to a predetermined amount ( Projecting amount) enters.

In the process in which the housing 31 compresses the valve spring 3 to a predetermined amount via the valve upper seat 4, while the valve stem 2 enters the inside of the split collar 6 as shown in FIG. The spirit collar 6 is rubbed up until it hits the first guide hole 33 and the slider 35 is pushed into the first guide hole 33 while being pushed. The first spring 36 is compressed by the sliding of the slider 35, and the contraction reaction force acts on the split collar 6.

When the mounting table 11 is further raised, the valve stem 2 pushes up the guide pin 38 and reaches the minimum inner diameter portion 6a of the split collar 6 (see FIG. 7).
And it gets caught on the minimum inner diameter of the split collar,
This is pushed up to a predetermined position (lift amount m in FIG. 9) while entering the first guide hole 33. First spring 3
6 while the contraction reaction force of FIG.
And the minimum inner diameter portion 6 of the split collar 6 as shown in FIG.
a, and enters the second guide hole 37 to further compress the second spring 44.

At this time, since the minimum inner diameter portion 6a rides on the outer periphery of the valve stem 2, the split collar 6
The spring 36 is pushed open in the outer diameter direction against the contraction reaction force of the spring 36. Further, when the valve stem 2 enters the second guide hole 37 and reaches a predetermined position (lift amount n in FIG. 9), the first spring 36 for urging the split collar 6 in the inner diameter direction as shown in FIG. The minimum inner diameter portion 6a engages with the minimum outer diameter portion 2a of the valve stem 2.

At the stage where the valve stem 2 has not yet entered the second guide hole 37 with respect to the contraction reaction force of the first spring 36, if the contraction reaction force of the second spring 44 becomes larger, the slider 35 is attached to the valve stem 2. Is excessively pushed up, and it becomes impossible to assemble the split collar 6 (engagement with the minimum outer diameter portion 2a of the valve stem 2). Therefore, the contraction reaction force of the first spring 36> the contraction reaction force of the second spring 44 Power, set to.

Thereafter, the mounting table 11 is turned down (returned). The split collar 6 descends integrally with the valve stem 2 while receiving the compression reaction force of the first spring 36, and is accommodated in the tapered hole 5 of the valve upper seat 4. When the valve upper seat 4 separates from the fitting concave portion 45 of the housing 31, the split collar 6 held by the valve upper seat 4 is moved outside the minimum of the valve stem 2 as shown in FIG. It is fixed to the diameter part 2a.

In the process until the fitting concave portion 45 of the housing 31 abuts on the valve upper seat 4, the split collar 6 is guided by the guide pin 38 which penetrates deeply through the minimum inner diameter portion 6a of the split collar 6 as described above.
(Variation caused when dropped into the valve upper seat 4) is also accurately corrected. For this reason, the split collar 6 is evenly pushed and opened by the valve stem 2 that raises the guide pin 38, so that the assembly failure of the split collar 6 (such as falling off) can be properly prevented.

It is to be noted that the receiving table provided with the jig 30 may be moved up and down instead of the table 11 being moved up and down. It is desirable that the cradle jig 30 be easily replaced so as to be able to cope with a dimensional difference between the valve stem 2 and the valve upper seat 4. Further, the present invention relates to an assembling apparatus for a split collet (split collar 6), and its application range is not limited to the valve system of the engine.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of an assembling apparatus representing an embodiment of the present invention.

FIG. 2 is an external view of a guide pin.

FIG. 3 is a partial cross-sectional view of the slider.

FIG. 4 is a partial sectional view of the slider.

FIG. 5 is an operation explanatory view of the assembling device.

FIG. 6 is an operation explanatory view of the assembling device.

FIG. 7 is an operation explanatory view of the assembling device.

FIG. 8 is an operation explanatory view of the assembling device.

FIG. 9 is an operation explanatory view of the assembling device.

FIG. 10 is an operation explanatory view of the assembling device.

FIG. 11 is an operation explanatory view of the assembling apparatus.

FIG. 12 is a schematic configuration diagram of an assembling device.

FIG. 13 is an explanatory view for assembling the valve system.

FIG. 14 is a configuration diagram of a jig.

FIG. 15 is an operation explanatory view of the assembling device.

FIG. 16 is an operation explanatory view of the assembling device.

FIG. 17 is an operation explanatory view of the assembling device.

[Explanation of symbols]

 Reference Signs List 30 jig 31 housing 33 first guide hole 35 slider 36 first spring (first spring means) 37 second guide hole 38 guide pin 44 second spring (second spring means) 46 fitting concave portion 47 enlarged diameter portion

Claims (3)

[Claims] 1. A split collet assembling device which is fitted into a tapered hole of a retainer mounted on a spring and is fixed to an outer periphery of a shaft portion by a contraction reaction force of the spring.
Two members opposing each other in the vertical direction, means for reciprocating at least one of these members in the direction of expansion and contraction of the spring, and a jig attached to the other member using one of the two members as an installation base. For the jig, the housing abuts on the retainer, the first guide hole allowing the split collet to enter the inside of the housing, and the first guide hole pressed by the split collet to compress the first spring means. A sliding slider, a second guide hole allowing the shaft portion to enter the inside of the slider, and a tip end insertable into the split collet from the second guide hole is pushed by the shaft portion from an initial position where it projects a predetermined amount. A guide pin that slides in the second guide hole while compressing the second spring means, and a shaft portion in which the minimum inner diameter portion of the split collet that enters the first guide hole enters the second guide hole. An assembling part, which is provided with an enlarged diameter part which allows the divided collet to open and close inside the first guide hole so as to be engaged with the minimum outer diameter part of the shaft part. apparatus. 2. The split collet according to claim 1, wherein the guide pin has a tip side set to the same outer diameter as a minimum inner diameter portion of the split collet and a tip formed in a spherical shape. Assembly device. 3. The split collet assembling apparatus according to claim 1, wherein the housing has a fitting recess for positioning the retainer coaxially with the guide pin.