JPH056029Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a valve connector assembly device used for assembling intake and exhaust valves to the cylinder head of an engine.

(Prior Art) As shown in Fig. 8, a poppet-type intake and exhaust valve A in an engine has a valve stem A' inserted from below into a valve guide C provided in a cylinder head B. A valve spring E is interposed between the valve retainer D attached to the upper end and the cylinder head B.
The valve retainer D is attached to the upper end of the valve stem A' next to the upper end of the valve stem A'. In other words, an upwardly opening tapered hole D' is provided in the center of the retainer D, while the valve stem
An engagement groove A is provided around the upper end of A', and two split ring-shaped studs F, F are assembled between the tapered hole D' and the engagement groove A. Then, using the spring force of the valve spring E that presses the valve retainer D upward, the above-mentioned retainers F and F are inserted into the tapered hole.
It is inserted between D' and the engagement groove A, and its wedge action fixes the valve retainer D to the valve stem A'.

By the way, the assembly of the actuators F and F or the attachment of the valve retainer D to the valve stem A' can be carried out as follows using, for example, an assembly device disclosed in Japanese Patent Application Laid-Open No. 57-38611. be exposed.

That is, as shown in FIG. 8, first, the stem A' of the valve A is inserted into the valve guide C of the cylinder head B, and the valve A is opened with the umbrella part A'' facing the periphery of the opening B'. is supported from below by a jig G, and a valve spring E is placed around the protrusion of the valve stem A' on the upper surface of the cylinder head B.
is set, and a valve retainer D, which accommodates and holds a pair of retainers F and F in a tapered hole D', is placed on the upper end thereof as shown by the chain line. Then, the retainer D is pushed down from the engagement groove A'' of the valve stem A' against the spring force of the valve spring E by the retainer pushing member H in the assembly device, and the retainer D is pushed down by the retainer pushing member I. Push down the retainers F and F to the position of the engagement groove A. Then, return both the push-down members H and I upward and move the retainer D upward by the spring force of the valve spring E. , the bolts F, F are engaged with the engagement groove A and tightened from the outside by the tapered hole D' of the retainer D, and the retainer D is coupled to the valve stem A' via the bolts F, F. Become.

(Problems to be Solved by the Invention) However, when assembling the retainers F, F or retainer D using the above-described procedure, the following problems may occur. That is, as shown in FIG. 9, when the retainer D is pressed down against the spring E by the retainer pressing member H, and the cotters F and F are subsequently pressed down by the cotter pressing member I, the cotters are pressed down. F may fall down or shift its position within the retainer pressing member H, and may become caught between the upper end surface of the valve stem A' and the retainer pressing member I. In this case, since the valve A is fixedly supported from below by the receiving jig G, the valve A and the cotter F are connected to the cotter pressing member I.
As a result, these parts are deformed, and the valve stem F is forced down from the state shown in Figure 9, causing the valve stem to
Sliding scratches may occur on the upper circumferential surface of A' and on the inner circumferential surface of cotter F.

The present invention deals with the above-mentioned problems when assembling the retainer or valve retainer to the valve stem.When the retainer is pressed down by the retainer push-down member, the retainer does not shift or fall within the push-down member. The purpose of the present invention is to prevent deformation and damage to the cotter and the valve when the cotter and the valve are caught between the upper end of the cotter valve stem and the cotter pressing member.

(Means for solving the problem) That is, the valve cotter assembly device according to the present invention has the following features:
The valve body and valve spring are set in the cylinder head in a predetermined state, and the valve retainer with the two-split clasp set in the tapered hole is placed on the valve spring. The valve holder is pressed down against force and assembled between the tapered hole of the retainer and the engagement groove provided in the valve stem, and the retainer is attached to the valve stem via the holder. The assembly device includes a retainer pressing member that presses down the valve retainer against the spring force of a valve spring, and a retainer pressing member provided inside the retainer pressing member and holding the retainer in a state in which the retainer is pressed down by the member. a cotter pressing member for pushing down; a guide member provided inside the cotter pressing member to support the cotter from the inside when the cotter is pressed down by the member;
and a receiving jig which is disposed opposite to each of the above members and receives the valve body from below, and the receiving jig is arranged so that the pressing force acting on the kotsuta when the kotsuta pushing member pushes down the kotsuta is a predetermined amount. The present invention is characterized in that it is provided with a biasing means that biases the valve body upwardly with a force that allows the valve body and the valve body to move in that direction as the valve member presses down when the valve body exceeds the value.

(Function) According to the above configuration, while the retainer pressing member presses down the valve retainer against the spring force of the valve spring, the retainer which is disengaged from the tapered hole of the retainer and located inside the retainer pressing member is pressed down. When an attempt is made to push the kotta down with the kotsuta push-down member, the kotsuta is supported from the inside by a guide member provided inside the kotsuta push-down member, causing the kotsuta to shift in position within the retainer push-down member. This effectively prevents the building from falling over. By the way, in the event that the kotsuta is caught between the upper end of the valve stem and the kotsuta push-down member, an excessive force will be applied to the kotsuta and the valve body as the push-down member moves downward. However, in this case, the valve body, the valve body, and the receiving jig are moved downward against the upward biasing force of the biasing means. Therefore, a situation in which a large force is applied to the kobuta or the valve body by the kotsuta push-down member or the kotsuta is forcibly pushed down can be avoided, and the deformation of the kotsuta or the valve body can be avoided.
Damage etc. will be prevented.

(Example) Hereinafter, an example of the valve connector assembly device according to the present invention will be described.

First, the overall general configuration of the device will be explained.
As shown in FIGS. 1 and 2, the apparatus 1 includes a workpiece pedestal 3 and a valve pedestal 4 placed on a pedestal 2, and a support pedestal 6 installed above the pedestal 2 via struts 5, 5. It has a push-down head 7 attached to it.

The workpiece pedestal 3 has a hollow frame shape, and both ends thereof are rotatably supported by bearings 8, 8, and stoppers 9, 9 for restricting the rotation of the pedestal 3 at predetermined positions are provided. It is provided so that it can assume an attitude inclined in one direction as shown in FIG. 2 and an attitude inclined in the opposite direction. Here, these postures are set so that the direction in which the suction and exhaust valves are attached to the workpiece (cylinder head) 30 placed on the pedestal 3 is perpendicular.

Further, the valve pedestal 4 is arranged to be located within the hollow part of the workpiece pedestal 3, and
Guide rods 10, 10 are vertically installed on the lower surface of the frame 2, and guide sleeves 11, 11 are fixedly installed on the lower surface of the frame 2.
A cylinder 12 is attached to the lower surface of the pedestal 2 and is slidably fitted in the pedestal 2 so as to be able to move up and down. In addition, the valve pedestal 4
A plurality of receiving jigs 13...13 are arranged in a row. These holders 13...13 are composed of a pin part 13a that projects upward from the pedestal 4, and a piston part 13b connected to the lower end of the pin part 13a. cylinder 1
Pressurized air is sealed or introduced into the space below the piston part 13b in the cylinder 14, and the pressure of the air holds the receiving jig 13 at the upper end position shown in the figure. It's getting old.

Further, the push-down head 7 is movable up and down by having guide rods 16...16 provided upright on the upper surface of the base plate 15 slidably fitted into guide sleeves 17, 17 fixed to the support base 6. With,
A cylinder 18 for raising and lowering the head 7 is installed on the support stand 6. On the lower surface of the substrate 15 in the head 7, a plurality of push-down units 19...19 are vertically disposed in a row, facing the respective holders 13...13 in the valve holder 4. As shown in FIG. 3, these units 19 include a cylindrical holder 20 whose upper end is fixed to a substrate 15, and a cylindrical retainer pusher connected to the lower end of the holder 20 via a spacer 21. Lowering member 22
, a similarly cylindrical push-down member 23 slidably fitted within the member 22, and a guide pin 24 further slidably fitted inside the member 22. The retainer pressing member 23 is biased downward by a spring 25 installed between it and the spacer 21, and the collar portion 23a at the upper end is a stepped portion 2 provided on the inner surface of the retainer pressing member 22.
2a, and the guide pin 24 is also held downward by a spring 28 attached between a ring member 26 attached to the upper end of the guide pin 24 and a spring receiving member 27 fixed to the upper part of the holder 20. The ring member 26 is held in a position where it contacts the upper surface of the spacer 21 with the auxiliary spacer 29 interposed therebetween.

Then, the pressure of the pressurized air is equal to the pressure of the spring 2
The pressure is set to allow the downward movement of the receiving jig 13 when the biasing force against the push-down member 23 of No. 5 exceeds a predetermined value.

Next, the operation of this device 1 will be explained according to the procedure of valve assembly work.

First, as shown in FIG.
After mounting a plurality of valve bodies 32 at predetermined positions, the head 31 is set on the workpiece pedestal 3 in a predetermined inclined posture (see FIG. 2). Further, a valve spring 3 is attached to the upper surface of the head 31 where the stem 32a of the valve body 32 protrudes.
3 and 33, and the spring 3
3, 33, and a pair of screws 3 in the tapered hole 34a.
The valve retainer 34 housing and holding the valves 5 and 35 is placed thereon. Then, the valve pedestal 4 is raised by the cylinder 12, and the tips of the pin portions 13a of the respective holder jigs 13 arranged in parallel on the pedestal 4 are brought into contact with the lower surface of the umbrella portion 32b of the valve body 32. As a result, the umbrella portion 32b supports the valve body 32 from below in a state in which the openings 31a of the intake and exhaust ports in the cylinder head 31 are closed.

Next, the push-down head 7 is lowered by the cylinder 18, so that the lower end of the guide pin 24 in the push-down unit 19 of the head 7 is brought into contact with the upper end of the stem 32a in the valve body 32, and the lower end of the retainer push-down member 22 is brought into contact with the upper end of the stem 32a of the valve body 32. Attach the end face to the valve retainer 34
The retainer 34 is pushed down against the upper surface of the valve spring 33 against the spring force of the valve springs 33, 33. At this time, as shown in FIG. 5, only the valve retainer 34 first moves downward, and the valve retainers 35, 35 held in the tapered hole 34a of the retainer 34
is temporarily removed from the hole 34a and temporarily stored in the retainer pressing member 22, but in this case, due to the outer circumferential surface of the tip of the guide pin 24 provided in the retainer pressing member 23. Since the inner circumferential surfaces of the cotters 35, 35 are supported, the retainer pressing member 2 of the cotters 35, 35
This will prevent positional displacement or falling within the unit. In this state, if the retainer 34 is further moved down, the cotter 35,
35 is pressed down by the push-down member 23 which is urged downward by the spring 25. Then, as shown in FIG. 6, when the retainer 34 is pushed down below the engagement groove 32c formed around the upper end of the valve stem 32a, the retainers 35 are pushed to the position of the engagement groove 32c. Can be lowered. Thereafter, when the entire pressing head 7 is raised by the cylinder 18, the valve retainer 34 is moved upward by the spring force of the valve springs 33 as the retainer pressing member 22 moves upward. However, at this time, the inner circumferential surface of the tapered hole 34a of the retainer 34 slides into contact with the outer circumferential surface of the clasps 35, 35, and the cotters 35, 35 are tightened inwardly.
The retainers 35, 35 are engaged with the engagement groove 32c of the valve stem 32a, and then the inner circumferential surface of the tapered hole 34a and the outer circumferential surface of the retainers 35, 35 come into close contact, preventing the retainer 34 from moving upward. It will be blocked. As a result, the retainers 35, 35 are wedged between the tapered hole 34a and the engagement groove 32c, and the retainer 34 is inserted into the stem 32a.
It will be fixed to.

Therefore, the valve retainer 34 is pushed down to the intermediate position by the retainer pressing member 22, and then the cotters 35, 3 are pushed down by the cotter pressing member 23.
When attempting to push down the valve stem 32a, as shown in FIG.
The lever 35 may be caught between the upper end of the valve stem 32a and the lever pressing member 23. At this time, when the valve body 32 is fixedly supported from below, the spring force of the spring 25 that urges the push-down member 23 downward or the upper end surface of the push-down member 23 is pushed against the spacer 21. After contacting the lower end surface, the force from the cylinder 18 that moves the entire push-down head 7 downward causes a large downward force to act on the lever 35 and the valve body 32 via the push-down member 23. . However, the supporting jig 13 supporting the valve body 32 from below is supported by the pressure of pressurized air in the cylinder 14 provided on the valve holder 4, and this pressure is applied to the When an excessive force exceeding a predetermined value is applied to the valve body 32, the pressure is set to allow the downward movement of the knobs 35, 35 and the valve body 32, so that the pressure from the knob pressing member 23 is When the force is transmitted to the receiving jig 13 via the handle 35 and the valve body 32, the jig 13
moves downward against the pressure of the air, and in conjunction with this, the valve body 32 and the stopper 35 also move downward. As a result, when the knob 35 is caught between the lower end of the knob pressing member 23 and the upper end of the valve stem 32a, a large force may be applied to the knob 35 and the valve body 32, or the knob 35 may be forcibly pushed. A situation where the valve body 35 and the valve body 32 are lowered can be avoided, and deformation or damage to the valve body 32 and the valve body 32 in such a case can be prevented.

In addition to using pressurized air as described above, the means for urging the receiving jig 13 upward may be the spring force of the spring 25 that urges the pusher pressing member 23 downward, or the means for moving the pressing head 7 downward. It is also possible to use a spring with a spring force that allows the above-mentioned levers 35, 35 and the valve body 32 to move downward when the driving force of the cylinder 18 exceeds a predetermined value.

(Effect of the invention) As described above, according to the valve cotter assembling device according to the present invention, when the cotter is pressed down by the cotter pressing member in a state where the retainer is pressed down by the retainer pressing member, the cotter is pressed down. The cotter is supported from the inside by the guide member provided inside the member, which effectively prevents the cotter from shifting or falling within the retainer pressing member. When pressing down the knob with the lowering member, even if the knob is caught between the lower end of the pressing member and the upper end of the valve stem, a large force may be applied to the knob and the valve body, or This will avoid a situation where the tip is forcibly pushed down while sliding on the circumferential surface of the stem. This prevents deformation and damage to the valve body and the valve body, making it possible to reuse them and preventing them from being wasted.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the present invention.
3 is an enlarged sectional view of the push-down unit taken along the line of FIG.
FIG. 7 is an enlarged cross-sectional view of the main part showing the function of the characteristic part of the present invention. Further, FIG. 8 is a cross-sectional view showing a general valve assembly state, and FIG. 9 is a main part cross-sectional view showing problems in the assembly. DESCRIPTION OF SYMBOLS 1... Valve screw assembly device, 13... Receiving jig, 13b, 14... Urging means (piston, cylinder), 22... Retainer pressing member, 23...
Kotta push-down member, 24... Guide pin, 32...
...Valve body, 32a... Valve stem, 33...
Valve spring, 34...Valve retainer, 3
4a...Tapered surface, 35...Kotta.

Claims (1)

[Scope of utility model registration request] The valve body and valve spring are set in the cylinder head in a predetermined state, and the valve retainer with the two-split clasp set in the taper hole is placed on the valve spring. A valve retainer assembly device that attaches a valve retainer to a valve stem by assembling it between a valve body and an engagement groove provided in a valve stem, and the valve retainer is pressed down against the spring force of a valve spring. a retainer pressing member; a cotter pressing member provided inside the retainer pressing member to press down the cotter with the retainer pressed down by the member; The valve body has a guide member that supports the valve body from the inside when the valve member is pressed down by the member, and a receiving jig that is disposed opposite to each of the above members and receives the valve body from below, and the receiving jig is connected to the valve body as described above. When the push-down force that acts on the kotsuta when it is pressed down by the kotsuta push-down member exceeds a predetermined value, the kotsuta and the valve body are moved upward with a force that allows the kotsuta and the valve body to move in that direction as the kotsuta push-down member moves. A valve fitting assembly device characterized in that it is provided with a biasing means for biasing the valve.