JPH0825108B2 - Press-fitting device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

INDUSTRIAL APPLICABILITY The present invention, in a valve guide for a cylinder head and a valve seat press-fitting device, allows a jig for mounting the cylinder head to be freely reversible within a predetermined angle range by a reversing device on a machining table of a numerical control (NC) machine. The present invention relates to a press-fitting device configured to hold the jig by backing up.

2. Description of the Related Art Conventionally, in a cylinder head in which an intake (IN) valve and an exhaust (EX) valve are arranged in a V shape, an IN, EX valve guide and an IN, EX valve seat are provided in this cylinder head. For press-fitting, the valve guide and valve seat have two press-in directions, IN and EX, so it cannot be press-fitted in a single direction.
They were press-fitted separately. As a prior art for inserting a valve into a cylinder head, there is Japanese Patent Publication No. 53-21145.

[Problems to be Solved by the Invention]

For this reason, a dedicated press-fitting device is required for IN and EX, and the cylinder head must be attached and detached between the press-in device for IN and the press-fit device for EX only. However, the cylinder head has to be transported, and the number of processes increases, and the setup time increases, and there is also the problem that when the valve guide and valve seat are press-fitted into another cylinder head with a different valve angle. ,
Since the jig itself had to be converted, there was a problem in mass production on the production line. Further, in the press-fitting process of the valve guide and the valve seat, the cylinder head is simply positioned and held on the processing table through the jig, so the pressure input of the valve guide and the valve seat directly acts on the jig and the cylinder head There was also a problem that the positioning accuracy of was reduced. Therefore, the present invention can significantly reduce the working time, can greatly simplify the device configuration,
An object of the present invention is to provide a valve guide and a press-fitting device for press-fitting a valve seat, which can maintain the positioning accuracy of the cylinder head for a long period of time.

[Means for solving problems]

As a means for achieving this object, the present invention is a press-fitting device for press-fitting and mounting an intake / exhaust valve guide and an intake / exhaust valve seat on a cylinder head, and when press-fitting an intake-side valve guide and valve seat in the same process. A jig for rotating and positioning the cylinder head on the machining table by rotating it in two positions so that the press-fitting axis of the cylinder and the exhaust side valve guide and valve seat coincide with the press-fitting axis when press-fitting in the same process. And a valve guide press-fitting device and a valve seat press-fitting device that are arranged to face each other on both sides of the cylinder head with their axes aligned with the press-fitting axis, and the jig is used in the press-fitting step of the valve guide and the valve seat. And the backup guide which is an immovable member, and press-fits the valve guide with the above-mentioned valve guide press-fitting device. Backup is transmitted from the jig to the backup guide, and the backup has a wedge-shaped cross section in which one side is inserted along the backup guide, and the jig has two rotation positions. It is characterized in that two contact surfaces that can be in close contact with each other are formed on the opposite surface of the backup.

[Action]

In the present invention employing such means, for example, when the jig is in one rotation position, the valve guide press-fitting device and the valve shoot press-fitting device press fit the intake side valve guide and valve seat to the cylinder head in the same process. When the jig is in the other rotation position, the valve guide press fitting device and the valve seat press fitting device press fit the exhaust side valve guide and the valve seat to the cylinder head in the same process. At that time, the force input of the valve guide by the valve guide press-fitting device and the force input of the valve seat by the valve seat press-fitting device act on the jig from opposite directions, and the press-fitting length of the valve seat with a short press-fitting length is the press-fitting length. Is canceled by the pressure input of the long valve guide, and the excessive pressure input of the valve guide thereafter acts on the jig. However, in the press-fitting process of the valve guide and valve seat, a wedge-shaped cross-section backup is inserted between the jig and the backup guide, which is an immovable member, one side of which is closely attached along the backup guide and the other side is the jig. Since it comes into close contact with the contact surface of the above, the excessive pressure input of the valve guide acting on the jig is reliably transmitted to the backup guide via the backup.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a front view showing the entire press-fitting device using an NC machine of the present invention, FIG. 2 is a side view of FIG. 1, and FIG.
The drawing is a top view of FIG. 1, in which reference numeral 1 is an NC machine, 2 is a bed of the NC machine 1, 3 is a garter fixed to the bed 2, 4 is a base installed on the bed 2, 5 Is a rail installed on the base 4, 6 is a processing table movably installed on the rail 5, 7 is a reversing jig installed on the processing table, 8 is reversing supporting the reversing jig 7. A jig leg, 9 is a clamp device for the cylinder head W fixed to the reversing jig 7, and 10 ', 11' are backups, and are installed via the cylinders 10a, 10a ', 11a mounted on the garter 3, respectively. ， Supported to move downward. Here, the backup 10, 10 'is formed in a wedge-shaped cross section in which one surface is a substantially vertical surface and the other surface is an inclined surface with an inverse slope, and when it is lowered by the cylinders 10a, 10a', the vertical One side thereof is guided along a backup guide 50 which is an immovable member supported on the bed 2. Further, on the side opposite to the clamp device 9 side of the reversing jig 7, there are formed two contact surfaces 51, 52 which can be in close contact with each other along the opposite surfaces forming the inclined surfaces of the backups 10, 10 '. Also, 12,12 'is IN, EX valve seat press fittings 12a, 12a'
And IN and EX valve seat press-fitting devices consisting of the press-fitting operation cylinders 12b and 12b ', and 13 and 13' are IN, EX valve guide press-fitting tools 13a and 13a 'and press-fitting operation cylinders 13b and 13.
It is an IN / EX valve guide press-fitting device consisting of b '. Here, the IN and EX valve seat press-fitting devices 12 and 12 'and the IN and EX valve guide press-fitting devices 13 and 13' are installed respectively on the same horizontal press-fitting axes L and L '. In addition, the reversing jig 7 installed on the descending table 6 is installed along the rail 5 at the mounting / extracting positions A, I of the cylinder head W.
It moves between N and EX press-fitting positions B and B ', and reversal position C. At the mounting / removing position A of the cylinder head W, a positioning device 14 for mounting the cylinder head W on the reversing jig 7 is provided on the bed 2, the details of which are shown in FIGS. 4 and 5 ( It is shown in the X arrow view of FIG. 4). Frames 16a, 16a are erected on the bed 2, and brackets 16c for fixing both sides to the frames 16a, 16a are horizontally installed.
A cylinder main body 17a of a positioning pin reciprocating cylinder 17 is fixedly installed substantially at the center of the bracket 16c. In addition, guide bushes 1 are provided on both sides of the bracket 16c.
8 and 18 are mounted and fixed, the guide bars 19 and 19 are slidably inserted into the guide bushes 18 and 18, and the support plate 20 is fixed to the tips of the guide bars 19 and 19. ing. In addition, at the center of this support plate 20, the clamp
20a is formed, and the positioning pin reciprocating cylinder 1
The plunger 17b protruding from the cylinder body 17a of 7 is connected to the clamp portion of the support plate 20 via the joint 21.
It is linked to 20a. Further, a plurality of rods 22 are provided upright on the support plate 20, and the tip end of the rods 22 are provided on the cylinder head W placed on the reversing jig when the plunger 17b is in the forward protruding state. Positioning pins 23 that engage with the plurality of positioning pin engagement holes Wa are fixed by setscrews 24. In addition, a pedestal 1 having both ends fixed to the pedestals 16a, 16a above
6b is provided laterally, and the cylinder body 25a of the positioning actuating cylinder 25 is fixedly installed substantially at the center of the frame 16b. Further, guide pushes 26, 26 are mounted and fixed on both sides of the pedestal 16b, and guide bars 27, 27 are slidably inserted into the guide bushes 26, 26, respectively. Positioning 28 is fixed to the tip of. A clamp portion 28a is formed substantially at the center of the positioning 28, and a plunger 25b protruding from the cylinder body 25a of the positioning operation cylinder 25 is connected to the clamp portion 28a of the positioning 28 via a joint 29. There is. On the other hand, the cylinder head mounting base 30 of the reversing jig 7 is formed with a working plate hole portion 30a, and the cylinder head mounting base 30 is screwed with a push bolt 31.
The tip of the push bolt 31 engages with the concave portion 32a of the cylinder head mounting base 32, so that the cylinder head mounting base 30
A cylinder head mounting table 32 is fixed on the top. In addition,
Reference numeral 33 is a nut for locking the push bolt 31. In addition, the cylinder head mounting table 32 is formed with a work hole 32a and an insertion hole 23a for the positioning pin 23 corresponding to the type of the cylinder head W. 6 to 8 are detailed views of the reversing jig 7,
Shaft portions 34a, 34b are fixedly provided at both ends of the cylinder head mounting base 30, and are pivotally supported by the reversing jig leg 8 via bare scilling 35, respectively. Further, the shaft portion 34a projects from the reversing jig leg 8, and the lever 36 is fixed to the protruding shaft end portion 34c of the shaft portion 34a. Further, the reversing jig operating cylinder 15 serving as a reversing device is provided on the side surface of the reversing jig leg 8 on the lever 36 side and the bracket 38 fixed to the reversing jig leg 8 via bolts 37.
The cylinder body 15a of the reversing jig actuating cylinder 15 is provided with the cylinder pivot shafts 15b fixed to the base end of the cylinder body 15a of FIG.
A joint 40 is screwed to a tip screw portion 15d of a plunger 15c projecting from the joint 40, and a side of the joint 40 opposite to the screw portion 15d is pivotally supported by a pin 41 at the tip of the lever 36. The pin 41 is removable and the joint 40 can be replaced. Further, a rear end threaded portion 15e is provided on a protruding end portion of the plunger 15c from the cylinder body rear end 15f, and a stopper 42 is screwed into the threaded portion 15e to adjust the position of the stopper 42 with respect to the plunger 15c. You can do it. Reference numeral 43 is a lock nut for locking the stopper 42. The position of the stopper 42 in the plunger 15c is as shown in FIG.
When the plunger 15c moves forward in the right direction, the stopper 42 screwed on the rear end threaded portion 15e of the plunger 15c contacts the cylinder body rear end 15f to stop the movement of the plunger 15c in the forward direction, whereby the lever 36 moves. The rotation stop position in the reversing direction (the lever 36 in FIG. 6 is indicated by the chain double-dashed line) is set, and at this time, the EX side valve hole H _{2 of} the cylinder head W set on the cylinder head mounting table 32 is set. Is set so that the center line of is parallel to the same press-fitting axis L'in the EX valve seat press-fitting device 12 'and the EX valve guide press-fitting device 13'. Also, from the stopper surface 40a of the joint 40 to the pin 41
The length E to the center is the stopper of the joint 40 screwed to the tip screw portion 15d of the plunger 15c when the reversing jig operating cylinder 15 operates and the plunger 15c retracts to the left in FIG. The surface 40a comes into contact with the front end 15g of the cylinder body to stop the backward movement of the plunger 15c, whereby the clockwise rotation stop position of the lever 36 (6th
(In the figure, the lever 36 is in a solid line), and the center line of the IN side valve hole H ₁ of the cylinder head W set on the cylinder head mounting table 32 at this time is the IN valve seat press-fitting device 12 and the IN valve guide. The press-fitting device 13 is set to be parallel to the same press-fitting axis L. The symbol F is the distance between the valve holes H ₁ (H ₂ ) in the cylinders adjacent to the cylinder head W. Then, by the press-fitting device configured as described above,
The operation of press-fitting the valve guide and the valve seat into the cylinder head W will be described in detail with reference to the drawings. First, when mounting the cylinder head W, the reversing jig 7 is moved by the machining table 6 of the NC machine 1 and the second
As shown in Fig. 3 and Fig. 3, mounting the cylinder head
The cylinder head W is located at the take-out position A and is mounted on the cylinder head mounting table 32 of the reversing jig 7 as shown in FIGS. 9 and 10. Here, the horizontal axis L is the press-fitting axis of the IN valve guide and the IN valve seat, and the point P is the center of rotation of the reversing jig 7. Further, in the figure, H ₁ indicates an IN side valve hole of the cylinder head W, and H ₂ indicates an EX side valve hole. At this time, the reversing jig operating cylinder 15 of the reversing jig 7 is retracted as shown in FIG. 6, and the lever 36 is at the position indicated by the solid line. Next, as shown in FIG. 11, the positioning pin reciprocating cylinder 17 is actuated and the plunger 17b is projected so that the positioning pin 23 engages with the positioning pin engagement hole Wa provided in the cylinder head W. At the same time that the cylinder head W is positioned on the cylinder head mounting table 32 of the reversing jig 7, the positioning actuating cylinder 25 is actuated, and the plunger 25b is projected so that the positioning 28 descends and the cylinder head W moves. Temporarily clamped on the mounting table 32,
In this state, the clamp device 9 rotates to rotate the cylinder head W.
Clamp is completed. As described above, when the cylinder head W is positioned on the mounting table 32 and clamped by the clamp device 9,
As shown in FIG. 12, the plungers 17b and 25b are retracted,
As the positioning pin 23 and the positioning 28 return to their original positions, the reversing jig 7 is set by moving the machining table 6 of the NC machine 1 to the IN press-fitting position B as shown in FIGS. 2 and 3. It At this time, the center line of the IN valve hole H ₁ of the first cylinder of the cylinder head W coincides with the press-fitting axis line L. When the reversing jig 7 is set to the IN press-fitting position B, the
As shown in FIG. 13, the backup 10 is lowered by the operation of the cylinder 10a and inserted between the backup guide 50, which is a stationary member, and the cylinder head mount 30 of the reversing jig 7. At this time, the backup 10 is smoothly guided while its one vertical surface is guided along the backup guide 50 and the opposite surface, which is an inclined surface having a reverse slope, faces the one contact surface 51 of the reversing jig 7 in parallel. After being inserted, it comes into close contact with the backup guide 50 and one contact surface 51 of the reversing jig 7. At the same time, the backup 11 is lowered by the operation of the cylinder 11a and comes into contact with the upper surface of the cylinder head W.
After that, from the left and right of the press-fitting axis L, IN valve seat press-fitting device
12, IN valve guide press-fitting device 13 moves in the direction of the arrow, and
The valve seat S ₁ and the IN valve guide T ₁ are pressed into the cylinder head W. IN valve seat on the first cylinder of the cylinder head W
When the press-fitting of S ₁ and the IN valve guide T ₁ is completed, the IN valve seat press-fitting device 12 and the IN valve guide press-fitting device 13 return to their original positions, and the backups 10 and 11 rise and the NC
The machining table 6 of the NC machine 1 is moved by the distance F by the device and the reversing jig 7 is set.
Is lowered again and the above-mentioned operation is repeated, so that the IN valve seat S ₁ of the next cylinder in the cylinder head W and
The IN valve guide T ₁ is press-fitted and the above operation is repeated for the number of cylinders in the cylinder head W, and the press-fitting of the IN valve seat S ₁ and the IN valve guide T ₁ of the cylinder head W is completed. When the series of press-fitting operations on the IN side are completed, the machining table 6 of the NC mechanism 1 moves from the IN press-fitting position B to the reversing position C, and the reversing jig 7 is moved, as shown in FIGS. 2 and 3. It is set to the reverse position. At the reversing position, as shown in FIG. 6, the reversing jig actuating cylinder 15 operates, and the plunger 15c of the reversing jig actuating cylinder 15 advances to the right, and the rear end screw part of the plunger 15c is moved. The lever 36 is rotated about the reversing jig rotation center P by a predetermined angle in the reversing direction until the stopper 42 screwed to 15e contacts the rear end 15f of the cylinder body. The rotation of the lever 36 is stopped by contacting the 15f, and the lever 36 is in a two-dot chain line state. The lever 36 and the cylinder head mount 30 of the reversing jig 7 integrated with the axis 34a and the cylinder head mount. The mounting table 32 and the cylinder head W, which is positioned and fixed on the cylinder head mounting table 32, is inverted around the reversing jig rotation center P to be in the state of FIG. Subsequently, the processing table 6 is moved from the reversal position C shown in FIGS. 2 and 3 to the EX press-fitting position B ′, and the reversing jig 7 is moved.
Is set to the EX press-fitting position B '. At this time, the center line of the EX valve hole H ₂ of the first cylinder of the cylinder head W coincides with the press-fitting axis L ′. When the reversing jig 7 is set to the EX press-fitting position B ', the
As shown in FIG. 15, the backup 10 ′ is inserted between the backup guide 50 and the cylinder head mounting base 30 of the reversing jig 7 by the operation of the cylinder 10 a ′ so that the backup guide 50 and the other reversing jig 7 contact each other. It comes into close contact with the contact surface 52. At the same time, the backup 11 is lowered by the operation of the cylinder 11a and comes into contact with the upper surface of the cylinder head W. afterwards,
From the left and right of the press-fitting axis L ', EX valve seat press-fitting device 12',
EX valve guide press fitting device 13 'is moved in the direction of the arrow, press-fitting the EX valve seat S ₂ and EX valve guide T ₂ in the first cylinder of the cylinder head W. EX valve seat on the first cylinder of the cylinder head W
When the press-fitting of S ₂ and EX valve guide T ₂ is completed, the EX valve seat press-fitting device 12 ′ and EX valve guide press-fitting device 13 ′ are returned to their original positions, and the backup 10 ′ is raised, and the NC device causes NC machine Move the machining table 6 of No. 1 by the distance R to set the reversing jig, and backup 1
By repeating 0's again and repeating the above operation, the EX valve seat S ₂ and the EX valve guide T ₂ of the next cylinder in the cylinder head W are press-fitted, and the above operation is performed by the number of cylinders in the cylinder head W. Repeatedly, the press-fitting of the EX valve seat S ₂ and the EX valve guide T ₂ of the cylinder head W is completed. When the series of press-fitting operations on the EX side are finished, the machining table 6 of the NC machine 1 returns from the EX press-fitting position B ′ in FIGS. 2 and 3 to the cylinder head mounting / extracting position A, and the reversing jig 7 Is set to the cylinder mounting / extracting position A as shown in FIG. That is, when the reversing jig 7 returns to the cylinder head mounting / extracting position A, the reversing jig operating cylinder 15 of the reversing jig 7 operates as shown in FIG. Until the stopper face 40a of the joint 40 screwed to the threaded end 15d of the plunger 15c abuts the front end 15g of the cylinder body, the lever 36 reverses from the two-dot chain line state. It rotates clockwise about the tool rotation center P by a predetermined angle, the stopper surface 40a contacts the front end 15g of the cylinder body, the rotation of the lever 36 stops, and the lever 36 returns to the solid line state.
The cylinder head mounting base 30, the cylinder head mounting base 32, and the cylinder head W of the reversing jig 7 are reversed and returned to the original state through the shaft portion 34a and the shaft portion 34a. After that, the clamp device 9 is in an unclamped state, the cylinder head W is taken out from the reversing jig 7, and the press-fitting process of the valve seat S and the valve guide T is completed. When the valve seat S and the valve guide T are press-fitted into the different types of cylinder heads W, the cylinder head mounting table 32 of the reversing jig 7 or the positioning device.
Support plate with 14 positioning pins 23, positioning 28
It is possible to easily deal with this by simply replacing the jig, and the setup time can be greatly reduced as compared with the conventional jig itself. Further, when press-fitting the valve seat S and the valve guide T into another cylinder head W having a different valve angle, it is easy to adjust the stopper 42 of the reversing jig operating cylinder 15 or replace the joint 40. The setup time can be greatly reduced compared to the conventional jig itself replacement, and only one reversing jig 7 is used, and many relatively large jigs can be used as in the past. You don't have to have it ready. In the above embodiment, the valve seat and valve guide on the IN side are press-fitted before the valve seat and valve guide on the EX side are press-fitted. Alternatively, the valve seat and the valve guide may be press-fitted before the IN-side valve seat and the valve guide are press-fitted.

【The invention's effect】

As described above, according to the present invention, for example, the valve guide press fitting device and the valve seat press fitting device, for example, the intake side valve guide and the valve seat are press fitted into the cylinder head in the same process when the jig is in one rotation position. When the jig is in the other rotating position, the valve guide press-fitting device and the valve seat press-fitting device press-fit the exhaust side valve guide and valve seat into the cylinder head in the same process. Therefore, unlike the conventional case, it is not necessary to replace the jig in correspondence with the press-fitting process for the intake side valve guide and the press-fitting process for the exhaust side valve guide, and the working time can be greatly shortened. Since the guide press-fitting device and the valve seat press-fitting device need only be a pair that serves both the intake side and the exhaust side, the device configuration can be greatly simplified. In particular, in the press-fitting process of the valve guide and valve seat, a backup with a wedge-shaped cross section is inserted between the jig and the backup guide, which is an immovable member, one side of which is closely adhered along the backup guide and the other side is the jig. Since it comes into close contact with the contact surface of the above, the excessive pressure input of the valve guide acting on the jig is reliably transmitted to the backup guide via the backup. Therefore, an excessive load does not act on the jig for positioning and holding the cylinder head on the processing table, and the positioning accuracy of the cylinder head can be maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a front view showing the whole press-fitting device by an NC machine of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a top view of FIG. 1, and FIG. 4 is a positioning device according to the present invention. FIG. 5 is a front view showing the details of FIG. 5, FIG. 5 is a view taken in the direction of the arrow X in FIG. 4, FIGS. 6 and 7 are detailed views showing the reversing jig according to the present invention, and FIG.
9 to 16 are explanatory views showing the operation of the left press-fitting device according to the present invention in the order of strokes, and FIG. 17 is a detailed view of section D in FIG. 1 ... NC machine, 4 ... Base, 5 ... Race, 6 ... Processing table, 7 ... Jig (reversing jig), 9 ... Clamping device, 10, 1
0 ', 11 ... Backup, 12,12 ... IN, EX valve seat press-fitting device, 13,13' ... IN, EX valve guide press-fitting device, 14 ...
Positioning device, 15 ... Reversing device, 23 ... Positioning pin, 32 ...
Cylinder head mounting table, A ... Cylinder head mounting / removing position, B, B '... Press-fitting device, C ... Reversing position, W ... Cylinder head.

Claims (1)

[Claims] 1. A press-fitting device for press-fitting and mounting an intake / exhaust valve guide and an intake / exhaust valve seat on a cylinder head, wherein a press-fitting axis line and an exhaust side when the intake-side valve guide and valve seat are press-fitted in the same process. The jig to hold the cylinder head on the machining table by rotating it to two positions so that the valve guide and the valve seat of is aligned with the press-fitting axis when press-fitting in the same process, and the press-fitting axis. In a press-fitting device equipped with a valve guide press-fitting device and a valve seat press-fitting device that are arranged opposite to each other on both sides of a cylinder head with their axes aligned, in the press-fitting step of the valve guide and valve seat, the jig and the stationary member are backed up. Inserted between the guide and the valve guide press-fitting device, the pressure input of the valve guide is backed up from the jig. The backup is provided with a backup, and the backup has a wedge-shaped cross section in which one side is inserted along the backup guide, and the jig has two backup positions opposite to each other. The press-fitting device is characterized in that two abutting surfaces which can be in close contact with the surfaces are formed.