JPS6322236A - Valve cotter assembler - Google Patents

Abstract

PURPOSE:To make a valve cotter assembled without causing a valve upper seat to be tilted, by installing a guide part, having a valve spring center line corresponding situated on an axis of a valve stem, at the side of a pressing surface part of a seat pressing member. CONSTITUTION:In an upper end in a through hole 10a of a seat pressing member 10, there is provided with a second hydraulic cylinder 14, and a tubular guide member 15, having a taper surface part 15a expanding outward, is tightly attached to a tip of a piston rod 14a. Inside the guide member 15, there is provided with the guide rod 17 energized downward by a coil spring 16, making the second hydraulic cylinder 14 expand and operate at the time of assembling a valve cotter. With this operation, the guide member 15 goes down and a tip of the guide rod 17 comes into contact with a stem head of a suction-exhaust valve B. Simultaneously with it, half cotter parts d1 of the valve cotter D are engaged with a cotter engaging groove b2 of the stem head with the taper surface part 15a of the guide member 15.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to a split-type valve cotter housed in a tapered hole in order to support the upper end of a valve spring of a vehicle engine such as an automobile by a valve upper seat. This invention relates to the improvement of a device for assembling a valve cotter to engage a cotter engagement groove in a valve stem head.

(Prior art) Conventionally, as such a device, for example, Japanese Patent Application Laid-Open No. 57-1999
As disclosed in Publication No. 38611@, the valve upper seat, which is arranged at the upper end to support the valve spring of the engine and has a split-type valve contorter accommodated in a tapered hole, is held from above by a seat pressing member. It is known that the valve starter is engaged with a starter engagement groove of the stem head of the intake and exhaust valve by pressing against the biasing force of the valve spring. In this device, a valve upper seat positioning recess is formed in the seat pressing surface of the seat pressing member, and a tapered surface expanding outward is formed on the inner periphery of the recess. Valve cotter assembly is sometimes done by positioning the valve upper seat in the recess while guiding its outer periphery so that the center line of the taper hole in the valve upper seat corresponds to the axis of the valve stem. The gap around the valve stem of the valve stem is equalized to allow the valve stem to engage with the valve stem's socket engagement groove.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional device, the valve spring that supports the valve upper seat is simply mounted and supported on the valve lower seat. During the process of transporting the cylinder head with the valve installed to the assembly station, it is easily affected by external forces such as vibration, and during assembly, the cylinder head is sometimes tilted to maintain the intake and exhaust valves in a vertical position. Misalignment is likely to occur in the valve spring, and due to these causes, there are many situations in which the valve spring cannot be placed in the correct seat support position.

If the valve spring is disposed in a misaligned manner, the center line of the taper hole of the valve upper seat and the spring center line of the valve spring are not located on the same center line. When pressing the seat, the pressing force from the seat pressing member does not act evenly in the direction of the center line around the entire circumference of the valve spring, so the valve upper seat is supported by the valve spring in an inclined state, and as a result, the valve upper seat The center line of the taper hole in the valve stem deviates from the axis of the valve stem, and the gap around the valve stem in the taper hole in the valve upper seat becomes uneven, making it difficult to securely engage the valve connector in the valve stem's connector engagement groove in the correct engagement position. A problem arises in that it is not possible to match them.

The present invention has been made in view of the above, and its object is that when a split type valve starter is engaged with the valve stem engagement groove of the valve stem as described above, the valve starter is accommodated. By specifying the shape of the pressing surface side of the seat pressing member that presses the valve upper seat, even if the valve spring is disposed in a misaligned position for some reason when the seat pressing member presses the valve upper seat, The misalignment can be corrected to the correct position, and the center line of the spring and the center line of the taper hole of the valve upper seat can be aligned on the same center line, thereby ensuring that the pressing force of the seat pressing member is centered around the entire circumference of the valve spring. It acts evenly in the linear direction, preventing the valve upper seat from tilting, and thus the gap around the valve stem in the tapered hole of the valve upper seat is maintained evenly, allowing regular engagement of the valve tipter with the stem head's tipter engagement groove. The objective is to ensure that the engagement can be carried out in the same engagement position.

(Means for solving the problem) In order to achieve the above object, the solving means of the present invention includes a valve spring disposed at the upper end of the engine to support the valve spring, and a split-type valve spring accommodated in the tapered hole. By pressing the valve upper seat from above with a seat pressing member against the biasing force of the valve spring, the valve connector is engaged with the connector engagement groove of the stem head of the intake and exhaust valve. Valve cotter assembly is aimed at the device, and includes a guide on the pressing surface side of the seat pressing member that contacts the outer periphery of the valve spring before pressing the valve upper seat to position the center line of the spring corresponding to the axis of the valve stem. The structure includes a section.

(Function) With the above configuration, in the present invention, the valve upper seat supported by the valve spring is pressed from above by the seat pressing member and moved downward against the biasing force of the valve spring, and this downward movement causes The valve starter accommodated in the tapered hole of the valve upper seat is engaged with the starter engagement groove of the stem head.

In this case, the seat pressing member is provided with a guide portion that contacts the outer periphery of the valve spring before pressing the valve upper seat to position the center line of the spring correspondingly on the axis of the valve stem. When pressing the valve upper seat, even if the valve spring is misaligned for some reason, the misalignment will be corrected to the correct position and the center line of the spring and the center line of the taper hole of the valve upper seat will be on the same center. As a result, the pressing force of the seat pressing member acts evenly in the direction of the center line around the entire circumference of the valve spring, preventing the valve upper seat from tilting. The surrounding gaps are maintained evenly, and the valve cockter is reliably engaged with the cockter engagement groove of the stem head in a normal engagement posture.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 5 shows a half-split piece dl accommodated in a tapered hole C1 for assembling a valve upper seat C to the stem head of an intake and exhaust valve B mounted on a cylinder head A of an automobile engine.

This figure shows an apparatus for assembling a valve starter according to an embodiment of the present invention, in which a two-split type valve starter D consisting of dl is engaged with the starter engagement groove b2 of the upper stem head. 1
, 1 are the above valve upper seats C, C, . . .
・And Valve Cotter D.

A parts feeder conveys and supplies D, . As shown in the figure, a valve colander D is an assembly robot that assembles the valve upper seat C accommodated in the tapered hole c1 to the side of the intake and exhaust valve on the side of the cylinder head A, and 4 is the cylinder spatula l-'A.
The assembly robot 3 conveys the assembly robot 3 along the conveyor bar 5 to the assembly position, and 6 is a drive cylinder type pressurizing device disposed above the assembly position.

At the tip of the hand 3a of the assembly robot 3, a gripping tool 7 for gripping the valve upper seat c in which the valve controller D is housed is disposed, and with the gripping tool 7, the valve controller D is assembled on the device 2 side. The assembly robot 3 grasps the valve upper seat C, and the assembly robot 3 moves the assembly robot 3 to the upper position, and the pressurizing device 6 then pressurizes the assembly robot 3, which is waiting at the position. For example, the valve upper seat C is assembled to the stem head on the intake valve B side of the cylinder head A via the valve colander D, and when this is completed, the swing cylinder 8 of the conveying means 4 is operated to extend, so that the cylinder head A is horizontally moved. The cylinder head A is then transported to the next station by the transport bar 5, and at this station, the cylinder head A is also swung by a predetermined angle in the opposite direction by the swing cylinder 8, and this time, the cylinder head A is moved to the exhaust valve B side of the cylinder head A. A valve upper seat C is assembled to the stem head of the valve through a valve seat D in a similar manner to that described above.

Further, as shown in enlarged detail in FIGS. 1 to 3, the gripping tool 7 includes a cylindrical sheet pressing member 10 having a through hole 10a, and at the upper end of the sheet pressing member 10, A first fluid pressure cylinder 11 for clamping and unclamping clamp arms 23, 23, 23, which will be described later, is connected via a connecting member 21. Further, a rod member 12 is integrally fixed to the upper end of the first fluid pressure cylinder 11, and a cylindrical member 13 urged downward by a coil spring 9 is externally fitted onto the rod member 12. The cylindrical member 13 is attached to the tip of the hand 3a of the assembly robot 3, and the gripping tool 7 is suspended and supported by the hand 3a in a floating manner.

Roughly speaking, a second fluid pressure cylinder 14 is disposed at the inner upper end of the through hole 10a of the sheet pressing member 10, and a piston rod 14a extending downwardly has a taper extending outward. A cylindrical guide member 15 having a surface portion 15a is fixed, and a guide rod 17 biased downward by a coil spring 16 is disposed within the guide member 15. When assembling the valve cockter,
By extending the second fluid pressure cylinder 14, the guide member 15 descends and the tip of the guide rod 17 comes into contact with the stem head of the intake and exhaust valve B.
Using the tapered surface portion 15a of the guide member 15, the half-split connector parts d+ and d+ of the valve connector D are pushed outward, and the engagement protrusion dz is engaged with the connector engagement groove b2 of the stem head.

d2 is engaged.

On the other hand, a piston 18 is provided in the first fluid pressure cylinder 11.
is housed, and in the circumferential groove 18b on the tip side of the piston rod 18a extending downward of the piston 18, there are three substantially "angular"-shaped rotation members 20, 2 that can rotate around the rotation shaft 19.
0.20 (only one is shown in the figure) is engaged with one end of each of the rotating members 20, and the other end of each of the rotating members 20 is connected to an I-shaped member provided on the lower surface of the connecting member 21 at a position equally divided into three in the circumferential direction. Groove 21
Slider 2 slidably arranged on a, 21a, 21a
2.22.22 is engaged with each recess 22a.

Further, one end (upper end) of a clamp arm 23 is fixed to each slider 22, and the other end (lower end) of each clamp arm 23 extends to the lower end of the sheet pressing member 10, and the first fluid pressure cylinder Each rotation member 20 is rotated by a predetermined angle around rotation @ 19 by the expansion and contraction operation of 11,
By moving each slider 22 radially outward or inward by the rotational movement of each rotating member 20, the outer periphery of the valve upper seat C is clamped with the clamp claw 23a provided at the lower end of each clamp arm 23.
It is designed to be unclamped.

Further, a pressing surface portion 24 for positioning the valve upper seat is recessed in the lower end surface of the seat pressing member 10, and the pressing surface portion 24 is used to position and press the valve upper seat C.

In summary, as a feature of the present invention, the sheet pressing member 10
A downwardly extending guide portion 25, 25° 25 is integrally formed at the outer peripheral position except for each clamp arm 23 at the lower end,
The inner circumferential surface of each guide portion 25 is formed into a tapered surface expanding outward, and the valve is fitted onto the valve stem b1 of the intake/exhaust valve B before the seat pressing member 10 presses the valve upper seat. By contacting the outer periphery of the upper end of the outer valve spring E1 of the springs E+ and E2, the center line of the spring is aligned with the valve stem b.
1 and are arranged to correspond to each other on the same axis. When assembling the valve connector, the pressure member 26 of the pressure device 6 presses the tip of the rod member 12 of the gripping tool 7, and the seat pressure member 10 is applied to the urging force of the coil spring 9. The upper end of the outer valve spring E1 is guided by each tapered surface of the guide portion 25. Guide part 25 around the outer periphery of valve upper seat C
．． The valve upper seat C is positioned on the pressing surface portion 24 by being guided by each tapered surface of 25.25.

Next, the operation of the apparatus for assembling the valve socket of this embodiment with grooves formed in this manner will be explained based on FIGS. 4 and 5.

(1) First, move the valve upper seats C, C, ... and valve topters D, D, ... to the parts feeder 1.
1, the assembly is performed by transporting and supplying the valve to the device 2, and storing the valve cotter D (half-split cotter parts d+, d+) in the tapered hole C1 of the valve upper seat C. The clamp arm 23 is compressed by the contraction of the first fluid pressure cylinder 11 of the gripper 7 disposed at the tip of the hand 3a of the assembly robot 3.
, 23 and 23 are moved radially inward, and the outer periphery of the valve upper seat C is clamped by the clamp claws 23a of each clamp arm 23 to support it at three points.

During this period, the cylinder head A of the engine is transferred to the position by the conveying means 4, and the cylinder head A of the engine is conveyed by the conveying means 4, and the valve stem D on the intake valve B side is first attached to the valve stems bl, bl, . , D... will be ready for assembly.

(2) Thereafter, the assembly robot 3 operates to assemble the valve upper seat C in which the valve controller D is housed to the fourth position above the cylinder head A that is waiting in position.
After arranging the gripping tool 7 as shown in FIG.
The sheet pressing member 10 is moved downward against the biasing force of the coil spring 9 by pressing the tip of the rod member 12 .

As a result, the upper end of the outer valve spring E1 is guided in contact with the tapered surface of each of the guide portions 25, 25.25 of the seat pressing member 1Q, as shown by the imaginary line in FIG. The center line of the spring of E1 is positioned corresponding to the axis of the valve stem b1. Thereafter, the sheet pressing member 10 is lowered by the rough pressing operation of the pressing device 6, and as shown in FIG.
As shown in b), the valve upper seat C is disposed on the pressing surface portion 24, and the valve stem b1
The axis of the valve upper seat C and the center line of the tapered hole C1 of the valve upper seat C are made to correspond to the same center line, so that the gap between the tapered hole C1 of the valve upper seat C and the vicinity of the valve stem b1 is maintained evenly. In this state, the lower end of the guide rod 17 is in contact with or close to the stem head of the valve stem b1.

(3) Next, the seat pressing member 10 is lowered by the rough pressurizing operation of the pressurizing device 6, and as shown in FIG. By moving the valve upper seat C downward against the biasing force, the upper surface of the valve upper seat C is held at the level between the stem head and the track. In this state, the half-split parts d+ and d+ of the valve socket D protrude from the upper surface of the valve upper seat C, but the guide member 1
Since 5 also moves downward in synchronization with the seat pressing member 10, its tapered surface portion 15a pushes the valve stem b1 and the valve upper seat C while pushing the half-split parts d+ and d+ of the valve seater D outward. It is slightly pushed into the gap between the taper hole c1 and the taper hole c1.

(4) Roughly lower the seat pressing member 10 by the pressurizing operation of the pressurizing device 6, and as shown in FIG. 4(d>), the stem head projects upward from the upper surface of the valve upper seat C. At the same time, the guide member 15 is lowered by the extension operation of the second fluid pressure cylinder 14, and the upper ends of the two half-split cotter parts d, , d are pressed downward.As a result, the upper ends of the two half-split cotter parts d+, d
The upper end of + is pressed by the tapered surface portion 15a of the guide member 15, and the engagement protrusions dz and dz are positioned below the cotter engagement groove b2 of the stem head.

(5) After the sheet pressing member 10 is pressed, the pressing operation by the pressing device 6 is stopped, and the sheet pressing member 10 is moved as shown in FIG.
) as shown above.

As a result, the valve upper seat C is moved upward by the biasing force of the valve springs E+ and E2, and the upward force caused by this movement acts on the two half-split parts d+ and Ch. Engagement protrusion d2. d2 is the shaft engagement groove b2 of the stem head.
while the valve upper seat C
is assembled to the valve stem b+ via the half-split connector parts d, d by the engagement of the tapered hole C1.

(6) When the assembly of the valve starters D, D, etc. to the valve stems b1, t)1, ... on the intake valve B side of the cylinder head A is completed in this way, the cylinder head A is shaken. The cylinder head A is horizontally supported by the extension operation of the moving cylinder 8, and then the transport bar 5
At this station, the cylinder head A is tilted in the opposite direction by a predetermined angle using the swing cylinder 8, and this time the valve stem b on the exhaust valve B side is moved to the next station.
+ , i: Valve colossal D for +, ,...
, D, . . . are assembled in the same manner as in (1) to (5) above.

Therefore, in the above embodiment, due to the downward movement of the rate pressing member 10, the contact of the guide portions 25, 25.25 with the outer periphery of the outer valve spring E+the upper end precedes the contact of the pressing surface portion 24 with the valve upper seat c. Therefore, when the valve upper seat is suppressed, even if the valve spring E1 is disposed in a misaligned position for some reason, the misalignment is corrected to the normal position by the taper of each guide portion 25, and the spring center line is corrected. The center line of the tapered hole C1 of the valve upper seat C is aligned with the center line of the valve upper seat C, so that the pressing force of the seat pressing member 10 acts evenly in the direction of the center line of the valve spring ElfE2, thereby tilting the valve upper seat C. Therefore, the gap around the circumference of the valve stem in the taper hole C1 of the valve upper seat C is maintained evenly, and the half-split connector parts d+ and d+ are connected to the connector engaging groove b2 of the stem head.
can be reliably engaged in the normal engagement posture.

In the above-mentioned embodiment, the valve upper seat C containing the valve holder D is gripped by the gripper 7 and pressed against the valve springs E+ and Ez. As disclosed in the publication, the present invention can also be applied to a method in which a valve upper seat containing a valve retainer is placed on a valve spring in advance, and then the seat is pressed and assembled by a seat pressing member.

Further, in the above embodiment, the case where the valve upper seat C and the valve lower seat D are automobile engine parts is shown, but it goes without saying that the application is not limited to this, and can also be applied to cases where they are made of other engine parts. do not have.

(Effects of the Invention) As explained above, according to the present invention, when the valve upper seat is arranged on the stem head of the intake and exhaust valve to support one end of the valve spring of the engine, the valve upper seat is inserted from above. A guide part is provided on the pressing surface side of the seat pressing member to be pressed, which contacts the outer periphery of the valve spring before pressing the valve upper seat to position the center line of the spring corresponding to the axis of the valve stem. When pressed,
Even if the valve spring is placed in a misaligned position for some reason, the misalignment will be corrected to the correct position by the guide section, and the valve upper seat will not tilt, thereby reducing the taper of the repulp upper seat. The gap around the valve stem in the hole is maintained evenly, so that the valve connector can be reliably engaged with the connector engagement groove of the stem head in a normal engagement posture.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical sectional front view of a gripping tool, FIG. 2 is an enlarged vertical sectional front view showing a state in which the valve upper seat is arranged corresponding to the stem head by the gripping tool, and FIG. 3 is a vertical sectional front view of the gripping tool. is a cross-sectional view taken along the line m-■ in Figure 1, Figure 4 is an explanatory diagram showing the procedure for assembling a valve controller, and Figure 5 is a valve controller applied when assembled to the stem head of an intake and exhaust valve of an automobile engine. The assembly is an overall schematic configuration diagram of the device. 10... Sheet pressing member, 24... Pressing surface portion, 25
...Guide part, B...Valve, bl...Valve stem, b2...Cotter engagement groove, C...Valve upper seat, C1...Tapered hole, D...Valve tipter, dl ... One part of half-split kotta, d2... Engaging protrusion, E+. Ez...Valve spring. (a) (b) Figure 4

Claims (1)

[Claims] (1) A valve upper seat, which is arranged at the upper end of the engine valve spring to support it and has a split type valve cotter accommodated in a tapered hole, is applied to the urging force of the valve spring by a seat pressing member from above. In the valve cotter assembly device, the valve cotter is engaged with the cotter engagement groove of the stem head of the intake/exhaust valve by pressing the valve cotter against the pressure. A valve cotter assembling device characterized in that a guide portion is provided that contacts the outer periphery of the valve spring before pressing the seat to position the center line of the spring correspondingly on the axis of the valve stem.