JPS6338988Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for automatically press-fitting a valve stem oil seal into a valve stem guide provided in a cylinder head of an engine.

An engine is composed of many parts such as pistons, gears, cams, shafts, etc., and lubricating oil is supplied to the driving parts as is well known.
Therefore, if the supply of lubricating oil stops, not only will the parts be damaged by seizure, but the engine itself will stop functioning. Therefore, various efforts have been made to maintain the supply of lubricating oil. For example, lubricating oil is also supplied to the gap between the intake and exhaust valves that move linearly using a cam mechanism and the valve stem guide inserted into the shaft of the intake and exhaust valves. On the other hand, if the amount of lubricant supplied is large, the lubricant will flow into the intake pipe or exhaust pipe and even into the combustion chamber, causing an increase in lubricant consumption. Therefore, a valve stem oil seal is used to supply an appropriate amount of lubricating oil to the gap between the intake and exhaust valves and the valve stem guide.
It is attached to the intake and exhaust valve stem guide.

In general, the intake valve and exhaust valve of an engine are each inclined at a predetermined angle with respect to the center line of the cylinder head, and the pitch of the intake valve and the pitch of the exhaust valve may be different.
Conventionally, a valve stem oil seal has been manually attached to a valve stem guide attached to such an intake/exhaust valve. However, the operator installs the valve stem oil seal by tilting the installation tool, which has the valve stem oil seal attached to the tip, in the axial direction of the valve stem guide. Not only do the lines not necessarily match, and the valve stem oil seal may be installed at an angle to the valve stem guide, but also the pressure on the valve stem oil seal may vary depending on the training level of the operator or individual differences. There are differences in the installation condition depending on the operator. As a result, the mounting accuracy of the valve stem oil seal is low and the accuracy varies widely, resulting in a problem that the amount of lubricating oil supplied to the gap between the intake/exhaust valve and the valve stem guide becomes excessive.

Furthermore, in the case of a multi-cylinder engine, since there are a large number of intake and exhaust valves, there is a problem in that manual installation of valve stem oil seals is not only time consuming but also troublesome.

In order to solve the above problem, it is also possible to consider a device that automatically press-fits the valve stem oil seal into the valve stem guide by attaching the tool with the valve stem oil seal attached to the tip to a hydraulic cylinder and moving it up and down. If the direction of inclination of the valve stem guide with respect to the center line of the cylinder head is reversed between the intake side and the exhaust side, there are two
It is necessary to provide two press-fitting devices, and along with this, two transfer tables for supplying the valve stem oil seal to the press-fitting device are also required on both the left and right sides of the conveying device. Therefore, there are two processes: a process related to the valve stem guide on the intake side and a process related to the valve stem guide on the exhaust side.
Since this requires a larger installation space, there are problems in that the equipment cost is high and the layout of the press-fitting equipment etc. is complicated.

This idea was made in view of the above circumstances, and a single unit automatically and accurately attaches the valve stem oil seal to the valve stem guide, which has two directions inclined in opposite directions with respect to the center line of the cylinder head. An object of the present invention is to provide a valve stem oil seal automatic press-fitting device for automatic press-fitting.

This invention has two intake valves and two exhaust valves, and is configured so that each valve can be applied to a cylinder head with a different pitch. It is attached to a press-fit head that is tilted and moved up and down about a horizontal axis, and each press-fit head is composed of a main body that is rotatable about its axis and a guide pin that is eccentrically provided at its tip. The present invention is characterized in that the pitch of the valve stem oil seal fitted to the guide pin is changed by rotating the main body portion by a fourth driving source provided in the press-fitting head.

This invention will be explained below with reference to the attached drawings. 1 to 6 are schematic diagrams showing an embodiment of this invention, which includes a conveying device 4 for intermittently conveying a cylinder head 2 onto a base 1 so that valve stem guides 3a and 3b face upward; A transfer table 6 that arranges the valve stem oil seals 5 at the same pitch as the intake valve stem guide 3a.
The transfer table 6 is provided with an index slide mechanism for indexing the valve stem oil seal 5 supplied from the parts feeder 7 via the chute 8. Further, above the base 1 on which the conveyance device 4 and the transfer table 6, etc. are mounted, a pillar 9 is placed in a direction perpendicular to the conveyance direction of the conveyance device 4.
A pair of beams 10 parallel to each other are arranged on the left and right with a predetermined interval as shown in FIG. A guide rail 12 is laid in the section, and a moving table 13 that moves linearly on the guide rail 12 is also provided. In addition, a reciprocating hydraulic cylinder 14 for reciprocating the movable base 13 is located on the movable base 1 on the right side of FIG.
It is connected to the end opposite to the stopper 11 at 0. Further, between the pair of beams 10, a rotation support part 15 is rotatably attached to the movable table 13, and as shown in FIG. 2, the rotation support part 15 has a U-shape as a whole. There is. That is, the rotation support part 15 has the following configuration, in which plate members 17, one of which is longer, are attached to both ends of the support plate 16, and the plate members 17
A rotating shaft 18 is attached to the rotating shaft 18 in a direction perpendicular to the moving direction of the moving table 13, and a rotating hydraulic cylinder 19 for rotating the support plate 16 around the rotating shaft 18 is mounted on the right side of FIG. It is attached to the upper surface of the moving table 13 and connected to the plate material 17. Further, a press-fitting head 20 is attached to the lower side of the rotary support section 15 constructed as described above so as to be tiltable and vertically movable as the rotary support section 15 rotates. That is, on the upper surface of the support plate 16 constituting the rotation support part 15, a press-fitting hydraulic cylinder 21 is fixed downwardly at approximately the center, and on both sides of the press-fitting hydraulic cylinder 21, the operating direction (hereinafter referred to as A guide post 23 into which a guide rod 22 is inserted parallel to the press-fitting direction is formed, and a press-fitting cylinder 21
A press-fit head 20 is provided at the lower end of the cylinder and guide rod 22. In addition, the number of press-fit heads 20 is the same as the number of intake valves or exhaust valves per combustion chamber multiplied by the number of cylinders (2
The press-fitting shaft 24 of the valve x 4 cylinders = 8) is provided so as to protrude downward in the press-fitting direction, and the press-fitting shaft 24 is attached so as to move slightly in the press-fitting direction, and a coil 25 that restrains the slight movement is attached to the third coil 25. As shown in the figure, it is attached by a nut 26 attached to the middle of the protrusion of the press-fit shaft 24. Furthermore, the press-fit shaft 24 built into the press-fit head 20 is provided with a pinion portion, as shown in FIGS. A rack shaft 27 is mounted perpendicular to the axial direction of the press-fit shaft 24, and an eccentric hydraulic cylinder 28 for linearly moving the rack shaft 27 is connected to the rack shaft 27. Further, at the lower end of the press-fit shaft 24, there is a recessed hole 2 that engages with the valve stem oil seal 5, as shown in FIG.
9 is formed, and a guide pin 30 protrudes downward in the press-fitting direction at approximately the center of the recessed hole 29, and is attached to the pair of press-fit shafts 24 by rotating the pair of press-fit shafts 24 by 180 degrees. The guide pin 30 is attached to the press-fit shaft 24 at an eccentric position such that the distance between the guide pins 30 is maximized or minimized. Furthermore, the shape of the guide pin 30 is
It has a round tip and a shape that fits when the guide pin 30 is inserted into the valve stem oil seal 5.

The operation of the valve stem oil seal automatic press-fitting device configured as above will be explained below.
By contracting the reciprocating hydraulic cylinder 14, the movable table 13 comes to the position shown by the solid line in FIG. Therefore, the press-fitting head 20 also tilts to the position shown by the two-dot chain line in FIG. In this state, the axis of the guide pin 30 provided on the press-fit shaft 24 attached to the press-fit head 20 and the center of the valve stem oil seal 5 arranged on the transfer table 6 at the same pitch as the intake valve stem guide 3a. Since the lines coincide with each other, the press-fit shaft 24 is lowered as the press-fit head 20 is lowered due to the extension of the press-fit hydraulic cylinder 21, and the valve stem oil seal 5 on the transfer table 6 is moved toward the guide attached to the press-fit shaft 24. It is fitted onto the pin 30 and engaged with the recessed hole 29, and then the press-fitting hydraulic cylinder 21 is contracted. By contracting the rotating hydraulic cylinder 19, the rotating support portion 15 rotates, and the press-fitting head 20 also tilts to the position shown by the solid line in FIG.
In that state, the guide pin 3 provided on the press-fit shaft 24
0 and the axis of the intake valve stem guide 3a provided in the cylinder head 2 on the conveying device 4, the pressure-fitting hydraulic cylinder 2
When the press-fit shaft 24 is lowered as the press-fit head 20 is lowered due to the extension of the valve 1, the guide pin 30, which is attached to the press-fit shaft 23 and fitted with the valve stem oil seal 5, is inserted into the intake valve stem as shown in FIG. Press fit the valve stem oil seal 5 into the intake valve stem guide 3a while inserting it into the guide 3a. At this time, if there is variation in the upper end of the intake valve stem guide 3a, the press-fit shaft 24 is slightly moved in the press-fit direction by a coil 25 provided on the press-fit shaft 24, and all the valve stem oil seals 5 are surely press-fitted. Further, as shown in FIG. 6, protrusions provided on the inner circumferential surface of the valve stem oil seal 5 and intake and exhaust valve stem guides 3a, 3b.
Since the force caused by the engagement with the groove provided on the outer peripheral surface of the valve stem oil seal 5 is greater than the force caused by the fit between the valve stem oil seal 5 and the guide pin 30, the contraction of the press-fitting hydraulic cylinder 21 causes the guide pin 30 to move into the valve stem oil. Even if it is pulled out from the seal 5, the valve stem oil seal 5 remains in the intake valve stem guide 3.
It remains at point a, and the press-fitting work of the intake part is completed. Thereafter, when the rotating hydraulic cylinder 19 is extended again, the press-fitting head 20 is tilted in the direction of the valve stem oil seal 5 on the transfer table 6 as described above.
Also, the axis of the guide pin 30 attached to the press-fit shaft 24 and the center line of the valve stem oil seals 5 arranged on the transfer table 6 are brought into alignment. When the press-fitting hydraulic cylinder 21 is expanded in this state, the valve stem oil seal 5 on the transfer table 6 fits into the guide pin 30, and then the press-fitting hydraulic cylinder 21 is contracted. However, since the arrangement pitch of the valve stem oil seals 5 on the transfer table 6 is the same as the pitch of the intake valve stem guide 3a, the pitch is different from the pitch of the exhaust valve stem guide 3b. Therefore, the guide pin 3 in which the pitch of the exhaust valve stem guide 3b and the valve stem oil seal 5 are fitted
When the rack shaft 27 is moved linearly by the operation of the eccentric hydraulic cylinder 28 in order to match the pitch of 0, the press-fit shaft 24 rotates 180 degrees, and the interval between the guide pins 30 eccentrically attached to the press-fit shaft 24 increases. , the pitch of the guide pin 30 matches the pitch of the exhaust valve stem guide 3b. Thereafter, when the reciprocating hydraulic cylinder 14 is extended while the rotating hydraulic cylinder 19 is extended, the movable table 19 comes to a position where it abuts the stopper 11 at the left end in FIG. In this state, the axis of the guide pin 30 and the axis of the exhaust valve stem guide 3b are aligned, and the pitch of the guide pin 30 is also aligned with the pitch of the exhaust valve stem guide 3b. Therefore, when the press-fitting hydraulic cylinder 21 is expanded in this state, the guide pin 30 is inserted into the exhaust valve stem guide 3b and the valve stem oil seal 5 is inserted into the exhaust valve stem guide 3b as shown in FIG. Press fit into 3b. After that, when the press-fitting hydraulic cylinder 21 is contracted, the valve stem oil seal 5 is moved to the guide pin 3 as described above.
0 and remains in the exhaust valve stem guide 3b, completing the press-fitting work of the exhaust part. Thereafter, when the reciprocating hydraulic cylinder 14 contracts and the moving table 13 is positioned at the right end indicated by the solid line in FIG. Since the arrangement pitch of the valve stem oil seal 5 on the stand 6 is the same as the pitch of the intake valve stem guide 3a, the pitch is different from the pitch of the guide pin 30 at the end of the press-fitting work of the exhaust section, and the eccentric hydraulic cylinder It is necessary to rotate the press-fitting shaft 24 by 180 degrees by the operation of 28 to align the pitch of the guide pin 30 with the alignment pitch of the valve stem oil seal 5 on the transfer table 6. The valve stem oil seal 5 on the transfer table 6 is fitted into the guide pin 30. After that, press-fit the intake part again.

Although the number of intake and exhaust valves per combustion chamber is two each, if there is one or more valves, automatic press-fitting of the valve stem oil seal is possible by providing a press-fit shaft according to the number of valves. be. Furthermore, although the arrangement pitch of the valve stem oil seals on the transfer table is the same as the pitch of the intake valve stem guide, it goes without saying that it may be the same as the pitch of the exhaust valve stem guide.

As is clear from the above explanation, this invention not only makes it possible to automatically press fit the valve stem oil seal into the valve stem guide with high precision and uniformity, but also allows the valve stem oil seal to be automatically press-fitted into the valve stem guide with uniform accuracy. Also, a so-called two-way valve stem guide can be press-fitted by one automatic press-fitting device. Additionally, compared to the case where two automatic press-fitting devices are used, not only the space occupied by the device is smaller, but only one process is required, and the layout of the device is simpler.
In particular, with this invention, multiple sets of two press-fitting shafts are attached to the press-fitting head, which can be tilted and moved up and down, so the number of drive sources such as hydraulic cylinders required is small, and in this respect, the equipment can be made smaller and simpler. In this invention, each press-fitting shaft is constituted by a body portion rotatable around the axis and a guide pin provided eccentrically at the tip thereof, and a fourth drive source is provided to rotate the body portion. By providing this, it is possible to change the pitch of the valve stem oil seal fitted to the guide pin, and as a result, according to this invention, it is possible to change the pitch of the valve stem oil seal fitted to the guide pin. Valve stem oil seals can be installed. Furthermore, compared to manual press-fitting work, the working time is much shorter, and costs are also reduced accordingly.

[Brief explanation of the drawing]

Fig. 1 is a schematic overall view showing one embodiment of this invention, Fig. 2 is a schematic longitudinal sectional view of Fig. 1, and Fig. 3 is a schematic longitudinal sectional view of Fig. 1.
The figure is a state diagram showing the rotation mechanism of the press-fit shaft, Figure 4 is a view taken along the - line in Figure 3, Figure 5 is a state diagram showing the fitted state of the valve stem oil seal, and Figure 6 is a state diagram showing the valve stem oil seal. FIG. 3 is a state diagram showing a state in which the stem oil seal and the valve stem guide are press-fitted. 3a...Intake valve stem guide, 3b...
Exhaust valve stem guide, 4... Conveyance device, 5
... Valve stem oil seal, 6 ... Delivery table, 13 ... Moving table, 14 ... Reciprocating hydraulic cylinder, 15 ... Rotating support part, 18 ... Rotating shaft, 1
9... Hydraulic cylinder for rotation, 20... Press-fitting head, 21... Hydraulic cylinder for press-fitting, 24... Press-fitting shaft, 28... Hydraulic cylinder for eccentricity, 30...
guide pin.

Claims (1)

[Scope of utility model registration request] A conveying device that intermittently conveys engine cylinder heads with their valve stem guides facing upward, and a delivery table provided on the side of the conveying device and arranging a plurality of valve stem oil seals, are provided above the conveying device. A moving table is provided that is linearly moved by a first drive source in a horizontal direction perpendicular to the conveying direction, and the moving table is provided with a rotating shaft that is centered on a horizontal rotation axis that faces in a direction perpendicular to the moving direction. A rotation support part is attached to which the rotation support part is tilted by a second drive source, and a third rotation support part is attached to the rotation support part.
A press-fitting head that is moved up and down by a drive source is attached, and the press-fitting head is further provided with a main body that is rotatable about an axis and a tip thereof that is eccentric with respect to the axis of the main body. A plurality of sets of press-fit shafts and a guide pin for fitting the valve stem oil seal are arranged in a line in a direction substantially parallel to the axial center of the rotary shaft and protrude downward, with a plurality of sets each having two shafts that are close to each other. An automatic valve stem oil seal press-fitting device characterized in that the press-fitting head is provided with a fourth driving source for rotating the main body portion.