JPH01177936A - Device for pressure cotter in - Google Patents

Abstract

PURPOSE:To assemble a cotter and a retainer positively with a valve stem by applying desired air pressure selectively onto a guide shaft and a cotter pressing cylinder, letting the cotter pressing cylinder face a press-in punch, and thereby constituting the guide shaft to be projected out of the pressing cylinder. CONSTITUTION:A guide shaft 50 and a cotter pressing cylinder 49 are constituted to be selectively pressed in by desired air pressure from a pressurizing means, energizing force acting on the guide shaft 50 and the cotter pressing cylinder 49 can thereby be finely and accurately regulated. Hence, energizing force to the guiding shaft 50 and the cotter pressing cylinder 49 can be maintained to be constant at all time even when they are in service for a long time, and the guiding shaft 50 and the cotter pressing cylinder 49 will never be erroneously operated, a cotter 6 and a retainer 7 can thereby be positively assembled with a valve stem 4b so that yield can be substantially improved. In addition, a press-in punch is structurally simple and can be manufactured with ease, cost can thereby be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for press-fitting a retainer that connects a valve shaft of an on-off valve device and a retainer in an on-off valve device that opens and closes intake and exhaust holes of an internal combustion engine.

As shown in FIG. 8, the conventional ischial limb blood internal combustion engine has an intake hole (or exhaust hole) (2) formed in a combustion chamber (1).
) is provided with an on-off valve device (3) that opens and closes the valve.

The above-mentioned on-off valve device (3) has an on-off valve (4) slidably inserted into the intake hole (2), and a two-piece valve (6) attached to the upper end of the valve shaft (4b) of this on-off valve (4). through the retainer (7
) and then connect the retainer (7) and cylinder head (8).
The valve portion (4a) of the on-off valve (4) is brought into contact with the valve seat (11) of the intake hole (2) by the elasticity of the valve spring (9) between the valve spring (9) and the valve is opened. . In addition, the above-mentioned Kotuku (6
) has a locking protrusion (6a) integrally formed in the center of the inner peripheral surface,
Positioning is achieved by locking the locking protrusion (6a) into a locking groove (4c) formed on the valve stem (4b).

By the way, when assembling the on-off valve position (3), a press-fitting device is used to press-fit the retainer (6) between the valve shaft (4b) and the retainer (7). A conventional press-fitting device of this type is, for example, one described in Japanese Patent Application Laid-open No. 14825/1983.

The outline of this conventional device will be explained with reference to FIG.
In the drawings, (12) is a substrate, and (13) is a substrate (12).
), the mounting base (14) is fixed to the bottom of the mounting base (
12) A chuck body attached and fixed to the lower surface, and this chuck body (14) has a hollow hole (15) opened at the tip surface.
15, and an inwardly expanding inclined guide surface (15a) is formed at the tip opening of the hollow hole (15). (16
) is a corer pressing cylinder that is slidably inserted into the hollow hole (15) of the chuck body (14), and this corer pressing cylinder (16) has a flange (16a) formed at the rear end of the cylinder. The removal is prevented by contacting the stepped portion (15b) of the hole (15). (17) is the chuck body (1
4) Hollow hole (15) and hole (13) in the mounting base (13)
The guide shaft (17) is disposed to be movable in the axial direction in a), and this guide shaft (17) has a flange (17a) formed approximately in the middle, and a lower shaft portion (17a) in front of the flange (17a). 17b) is inserted and fitted into the above-mentioned pressure cylinder (16) so as to be relatively movable. (1B) is a first portion compressed and interposed between the lower surface of the mount (13) and the rear flange (16a) of the cotter press cylinder (16) in the hollow hole (15) of the chuck body (14). , and this first spring (
The spring force of 18) constantly urges the pressure cylinder (16) downward. (19) is the guide shaft (1
7) Flange (17a) and hole (13a) in the mounting base (13)
a second spring compressed and interposed between the upper end surface of the
The spring force of the second spring (19) constantly urges the guide shaft (17) downward. (20) is a plurality of holding claws attached to the chuck main body (14) at equidistant positions on the circumference via a pivot (21) so as to be openable and closable; Claw part (20a)
The claw portion (20a) is always urged inward by the spring force of a spring (22) interposed between the upper end portion (20b') and the chuck body (14).

When press-fitting the stopper (6) into the locking groove (4c) of the valve stem (4b), when the chuck main body (14) is lowered at the supply position of the retainer (7) and the stopper (6), During this lowering process, the retainer (7), which houses the two-split holder (6) in the center hole (7a), uses the spring force of the spring (22) to move the retaining claw (20) to the claw part (20).
20a). Thereafter, the chuck body (14) moves upward and horizontally to move the valve shaft (4b
), and when the chuck body (14) descends, the valve stem (4b) passes through the inside of the cotcoon (6),
While pushing up the guide shaft (17) against the biasing force of the second spring (19), insert the Kotuku (6) into the retainer (7).
) from the center hole (7a). This pushed up tip (6) is expanded outward at the tip of the guide shaft (17) and held by the inclined guide surface (15a) of the chuck body (14). Thereafter, as the chuck main body (14) further descends, the valve stem (4b) passes through the center of the open lever (6) and is connected to the second spring (19).
) is inserted into the inside of the cylinder press cylinder (16) while resisting the urging force of the cylinder (16). At this time, the top surface of the cylinder press cylinder (16) contacts the upper surface of the cylinder (6), and the first spring (18) A downward pressing force acts on the lever (6) due to the biasing force, and the lever (6) is held at a position below the lock 'a (4c) of the valve stem (4b). After that, when the chuck body (14) rises, the retainer (
7) is pushed up by the valve spring (9), so the valve spring (6) is biased in the closing direction by the frictional force between its inner circumferential surface and the outer circumferential surface of the valve shaft (4b), and the inner circumferential surface is locked. Projection (
6a) is fitted into the lock n (4c) of the valve stem (4b), and the retainer (7) and the retainer (6) are attached to the valve stem (4b).
The assembly is completed.

2 n<n ′ x
. The conventional press-fitting surface mentioned above is a Kotter press cylinder (1
6) and the guide shaft (17), the first and second springs (1B) (19) are used, but these springs (18) (19) cannot articulate the biasing force. Moreover, since the spring force changes with long-term use, operating errors may occur in the guide shaft (17) and the Kotsukou pressing cylinder (16), causing the Kotsukou (6) to change.
There was a problem that assembly defects occurred frequently and the yield was extremely low.

An object of the present invention is to enable the urging force acting on the cylinder press cylinder and the guide shaft to be articulated so that the cylinder and retainer can be reliably assembled to the valve shaft.

The present invention for divination has been proposed in order to achieve the above-mentioned object, and a recessed portion for centering and holding a retainer in which a two-split contour is housed in the center hole is formed at the tip, and the tip is A press-fitting punch that is vertically movable and has a hollow hole that opens in a recess and has first and second locking steps facing each other at a predetermined interval in the middle, and a hollow hole of the press-fit punch. a cotter press cylinder that is inserted into the hole so as to be movable back and forth and has a flange formed at the rear end of the hollow shaft portion to engage with the first and second locking steps of the press-fit punch; and the press-fit punch. The rear end of the shaft is slidably accommodated in the hollow hole and is inserted concentrically and relatively movably into the cocktor press cylinder, and abuts against the rear end surface of the cocktor press cylinder in a separable manner. a guide shaft integrally provided with a sliding part that applies a predetermined pressing force to the pressing tube; It consists of a pressurizing means that selectively applies a desired air pressure to the cylinder from the rear,
When the pusher press cylinder and the guide shaft are at their forward end positions, the tip opening of the pusher press cylinder faces the recess of the press-fitting punch, and the shaft tip of the guide shaft is held protruding from the tip opening of the press cylinder. It is something.

When the vertical press-fitting punch descends, the retainer fits into the recess of the press-fitting punch, the tip surface of the pusher press cylinder contacts the retainer and the upper end surface of the pusher, and the tip of the shaft of the guide shaft enters the inside of the pusher. It penetrates and the retainer is centered and held.

After centering the retainer, the press-fitting punch descends while compressing the valve spring that is disposed around the valve shaft and elastically supports the retainer, and as a result of this descent, the lower end surface of the retainer is brought into contact with the tip surface of the valve shaft. The tip surface of the guide shaft, which touches the outer peripheral edge and is urged downward by the desired air pressure from the pressurizing means, abuts the tip surface of the valve stem, and the guide shaft moves upward inside the hollow hole of the press-fit punch. Due to the relative movement, the pressing force on the cotter pressing cylinder ceases to act, and as a result, the cotter is pushed up from the retainer while pressing the cotter pressing cylinder, and expands within the tip opening of the hollow hole of the press-fitting punch. Even after the retainer is expanded, the press-fitting punch descends while compressing the valve spring. Then, the coater pressing cylinder locks with the first locking step in the hollow hole of the press-fitting punch, and the sliding part of the guide shaft separates from the pressing cylinder and presses the coater downward to valve the coater. It is inserted into the lower part of the shaft than the lock 111. When the press-fitting punch is held at the lower end, a desired air pressure from the pressurizing means acts between the sliding part of the guide shaft and the rear end surface of the cotter pressing cylinder, thereby pressing the cotter pressing cylinder downward. . When the press-fitting punch rises in this state, the retainer follows the press-fitting punch and rises due to the spring force of the valve spring. At this time, the above-mentioned stopper is pressed by the downwardly biased push cylinder, and is pushed up while being pressed against the inner diameter tapered surface of the center hole of the retainer, so that the locking protrusion of the stopper and the valve stem are locked. When aligned with the groove, the retainer is reliably closed by the inner diameter tapered surface of the retainer, and the locking protrusion fits into the locking groove.

Embodiments of the present invention will now be described with reference to FIGS. 1 to 7. [! On page 1, (31
) is a mounting frame body, and this mounting frame body (31) has a through hole (3
1a) and a guide hole (31b'') are formed in the vertical direction. (32) is a hydraulic cylinder mounted and fixed on the top surface of the mounting frame (31), and its rod (33) is attached to the mounting frame (31). The holder protrudes downward through the M through hole (31b).

(34) is the rod (33) of the above hydraulic cylinder (32)
A press-fitting punch (35) is attached and fixed to the tip of the mounting frame body (31) so that it can move up and down.
The lower end of this guide rod (35) is attached and fixed to a mounting piece (36) that protrudes horizontally from the upper end of the press-fitting punch (34) using a guide rod that is slidably guided and held by the press-fit punch (34). It is. The press-fitting punch (34) is attached to the mounting base (37).
) A cylindrical punch body (38) is integrally attached and fixed to the tip surface of the valve body (38), and a valve spring (9) is arranged concentrically around the valve shaft (4b) on the tip surface (39). A recess (
40), and a hollow hole (41) opening into the recess (40) is vertically formed inside. The hollow hole (41) of the press-fitting punch (34) has a large diameter hole (41a
) with small diameter holes (41b) (41c) formed above and below the large diameter hole (41a) and the upper small diameter hole (41c).
A first locking step (42) and an annular groove (43) are formed at the boundary between the large diameter hole (41a) and the lower small diameter hole (41C). Locking step (4
4) is formed. (45) and (46) are connection holes formed at predetermined locations on the circumferential surface of the mounting base (37) of the press-fit punch (34), and these connection holes (45) (46)
is the hollow hole (41) via the air passage (47) (48).
) and the annular groove (43) each have a communicating opening. (49) is the center hole (7a) of the retainer (7).
) is a cylinder for pressing the two-piece cylinder (6) housed in the cylinder (49).
and a flange (49b') that engages with the second locking step (42) (43). The above-mentioned pressure force m (49) is the hollow hole (
41) so as to be movable back and forth, and the hollow shaft part (49a)
is held in the lower small diameter hole (41C) and the flange part (49b) is held in the large diameter hole (41a), and when the flange part (49b) is in the forward end position,
) is locked to the second locking step (44), and the tip opening end slightly protrudes from the hollow hole (41) to form the tip opening (49d).
) faces the recess (40). (5o) is a guide shaft that presses the pressure cylinder (49) downward and collides with the valve shaft (4b).
) is integrally provided with a protrusion (50b) on the tip surface of the shaft portion (50a) and a sliding portion (50c) on the rear end.

The guide shaft (5o) is slidably accommodated in the hollow hole (41) of the press-fitting punch (34), and the shaft portion (50a) is placed concentrically within the cotter press cylinder (49) and in the vertical direction. The sliding part (50c) is held in the upper small diameter hole (41b), and when the sliding part (50c) is at the forward end position.
c) collides with the rear end surface (49c) of the Kotsuta pressure cylinder (49), and the protrusion (50b) at the tip of the shaft (50a) protrudes downward from the tip opening (49d) of the Kotsuta press cylinder (49). It is intended to be done. (51) is a pressurizing means for selectively applying a desired air pressure to the contour press cylinder (49) and the guide shaft (50);
1) is a pressure pipe (53) connected to the near compressor (52).
) is connected to the electromagnetic switching valve (54), and the supply pipe (55) is branch-connected to the electromagnetic switching valve (54) (
56) into the connection port (45) of the punch (34).
(46), adjust the contact pressure to the desired value.

Next, the operating procedure of the apparatus of the present invention will be explained as follows.

The retainer (7), which houses the two-split Kotsuku (6) in the center hole (7a), is elastically supported by a valve spring (9) disposed around the valve shaft (4b) at the assembly position. has been done. Then, at the above assembly position, press-fit punch (34
) is located at the rising end as shown in Fig. 2, pressurized air from the near compressor (52) of the pressurizing means (51) passes through the precision pressure reducing valve (56) and the electromagnetic switching valve (54). After the air is fed under pressure into the first air passage (47) of the press-fitting punch (34) through the
b) flows into the upper part of the guide shaft (50) and slides into the sliding part (
Apply desired air pressure to 50c) from above. The guide shaft (50) is urged downward by this air pressure, presses the cotter press cylinder (49), and presses the cotter press cylinder (49).
The flange (49b) of 9) is engaged with the second engagement step (44) of the hollow hole (41), and both the Kotsukuku press cylinder (49) and the guide shaft (50) are held in the forward position, The tip opening (49d) of the cotter press cylinder (49) faces the recess (40) of the press-fitting punch (34), and also faces the guide shaft (50).
) is held so that the protrusion (50b) at the tip of the shaft (50a) protrudes from the tip opening (49d'') of the pressure cylinder (49).In this state, the press-fitting punch (34) descends, and its descending process As shown in Figure 3, press-fit punch (34
), the retainer (7) is fitted into the recess (40), and the tip end surface (49e) of the rotor pressing cylinder (49) is in contact with the upper end surfaces of the retainer (7) and the retainer (6), and
As shown in FIG. 4, the protrusion (50b) at the tip of the shaft portion (50) of the guide shaft (50) enters the interior of the two-split rotor (6) to center and hold the retainer (7). After centering the retainer (7), the press-fitting punch (34) descends while compressing the valve spring (9), and as a result of this descent, the lower end surface of the retainer (6) aligns with the tip end surface (4d) of the valve stem (4b). The protrusion (5) at the tip of the guide shaft (50)
0C) collides with the tip surface (4d) of the valve stem (4b). Then, the guide shaft (50) moves relatively upward in the hollow hole (41) of the press-fitting punch (34), and moves into the sliding part (50c).
is separated from the rear end surface (49C) of the cotter pressing cylinder (49), and no pressing force is applied to the cotter pressing cylinder (49). As a result, the valve stem (4b)
) is in contact with the tip surface (4d) of the retainer (7), so as shown in FIG. It expands within the tip opening of the hollow hole (41).

Even after the above-mentioned Kotsuku (6) expands, the press-fit punch (34)
) moves down while compressing the valve spring (9), then the pressure is exerted? fi (49) is the first locking step (42) of the hollow hole (41) of the press-fitting punch (34) as shown in FIG.
), the sliding part (50c) of the guide shaft (50) separates from the rear end surface (49c) of the cylinder press cylinder (49), and the cylinder cylinder (6) presses the cylinder as shown in Fig. 6. It is pressed downward by the cylinder (49) and is inserted into the lower part of the valve stem (4e) through the locking R (4c). When the press-fitting punch (34) is held at the lower end, the electromagnetic switching valve (54) is switched, and the pressurized air from the near compressor (52) of the pressurizing means (51) is transferred to the precision pressure reducing valve (56). )
and press-fit punch (34) via electromagnetic switching valve (54).
After being pumped into the second air passageway (48) of the hollow hole (
41) through the annular enclosure'/R (43).
) into the sliding part (50C) of the guide groove (50).
The rear end surface (49c
) to apply the desired air pressure. This air pressure urges the Kotor pressure cylinder (49) downward, and the Kotor (6)
is pressed downward by the pressure cylinder (49). When the press-fitting punch (34) rises in this state, the retainer (7)
) is the press-fitting punch (34) due to the spring force of the valve spring (9).
rises following. At this time, the cotter (6) is urged downward by pressurized air from the pressurizing means (51) via the cotter pressing cylinder (49), so as the retainer (7) rises, the cotter (6) ) is the retainer (7
) rises while coming into pressure contact with the inner diameter tapered surface. Therefore, the locking protrusion (6a) of the cockter (6) and the valve stem (4b)
When the locking groove (4c) and the locking groove (4c) match, as shown in FIG. Groove (4c
), and the assembly of the retainer (7) and the retainer (6) to the valve stem (4b) is completed. Even after the assembly of the retainer (7) and the screwdriver (6) is completed, the press-fit punch (34
) rises, and as a result of this rise, the retainer (7) is removed from the recess (40), and the press-fitting punch (34) is held at the rising end. The same operation is repeated below, and the pressurizing means (5
The air pressure of the pressurized air fed from 1) is controlled by the precision pressure reducing valve (
56) to adjust to the desired set pressure value.

According to the present invention, the guide shaft and the pressure cylinder are selectively pressed by the desired air pressure from the pressurizing means, so that the biasing force acting on the guide shaft and the pressure cylinder is reduced. It can be adjusted finely and accurately.

Therefore, even after long-term use, the biasing force against the guide shaft and the retainer cylinder can always be kept constant, and there is no operational error in the guide shaft and the retainer cylinder. It can be assembled reliably and the yield can be significantly improved. In addition, the structure of the press-fitting punch is W1, making it easy to manufacture and reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the device of the present invention, Figs. 2 to 7 are explanatory longitudinal cross-sectional views showing the operating procedure of the device of the present invention, and Fig. 2 shows the press-fitting punch at the rising end position. 3 to 5 show the press-fitting punch in the middle of its descent, FIG. 6 shows the press-fitting punch at its lower end, and FIG. 7 shows the press-fitting punch in the middle of its ascent. FIG. 8 is a sectional view of the on-off valve device, and FIG. 9 is a longitudinal sectional view of the conventional device. (6)...-Cotter, (7)...-Retainer, (34)--Press-fitting punch, (40)--Concavity, (41)--Hollow hole, (42)...
First locking step portion, (43)--Second locking step portion, (49)--Cotter press cylinder, (49a) =--Hollow shaft portion, (49b)
・=Flame, (49C)・-Rear end surface, (49d)
... - Tip opening, (50) - Guide shaft,
(50a) - shaft part, (50b') - sliding part,
(51) --- Pressurizing means. 311 Figure 4 Figure 71 Figure 6

Claims (1)

[Claims] (1) A recess is formed at the tip to center and hold the retainer containing the split cotter in the center hole, the tip opens into the recess, and first and second locking steps are formed in the middle. A press-fitting punch that is vertically vertically formed with hollow holes facing each other at a predetermined interval, and is inserted into the hollow hole of the press-fitting punch so as to be movable back and forth, and is press-fitted into the rear end of the hollow shaft. a cotter press cylinder formed with a flange that engages with the first and second locking steps of the punch; and a cotter press cylinder that is slidably accommodated in the hollow hole of the press-fit punch, and
A sliding member is provided at the rear end of the shaft that is concentrically and relatively movably inserted into the cotter press cylinder and abuts against the rear end surface of the cotter press cylinder in a separable manner to apply a predetermined pressing force to the press cylinder. A guide shaft with a moving part integrated therein, and a tip branching out into the upper and middle portions of the hollow hole of the press-fitting punch to selectively apply desired air pressure to the guide shaft and the cotter press cylinder from the rear. When the cotter pressing cylinder and the guide shaft are at their forward end positions, the opening at the tip of the cotter pressing cylinder faces the recess of the press-fit punch, and the tip of the shaft of the guide shaft faces the opening at the tip of the pressing cylinder. A cotter press-fitting device characterized in that the cotter is held in a more protruding manner.