JP2997262B1 - Cotta mounting jig, cotter removal jig and equipment - Google Patents

Abstract

A cotter mounting operation for mounting a cotter between a valve stem of an engine and a spring retainer can be smoothly performed. SOLUTION: A cotter pressing member 48 for pressing a cotter 69 is fitted on the inner peripheral side of a main body 47 so as to be movable in the axial direction. The cotter pressing member is formed with an insertion hole into which the distal end portion of the valve stem 72 is inserted, and an elastic force toward the cotter is applied by the elastic body 49. Pressing end 4 of cotter holding member
Reference numeral 8a denotes an outer diameter at which the pushing force is not applied to the cotter insertion hole 70a of the retainer 70 and the center of the retainer 70 is aligned. As the retainer is pushed down to the base end side of the valve stem by the main body, the cotter pressing member pushes down the cotter while making the distal end of the valve stem penetrate between the two cotters, and the cotter is inserted into the engagement groove of the valve stem. Is engaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cotter attaching jig used for attaching and detaching a cotter between a valve stem and a spring retainer of an engine, a cotter removing jig and an apparatus.

[0002]

2. Description of the Related Art Conventionally, an operation for mounting a cotter between a valve stem and a spring retainer of an engine includes a mounting / removing device 61 shown in FIG. 13 and a jig shown in FIG. 62 is used. An apparatus 61 shown in FIG. 13 includes a base 64 provided with a support 63 for supporting a cylinder head of an engine,
4 has a lever 66 pivotally supported on a support 65 erected on one end of the support 4, and a pressing member 67 for pressing a spring retainer of a cylinder head is provided at an intermediate portion of the lever 66. The jig 62 of FIG. 14 has an opening 62a formed in the lower peripheral wall of the cylindrical body.

As shown in FIG. 14, the cotter mounting operation by the device 61 is performed by mounting a cylinder head 68 on a support 63 of the device 61, as shown in FIG.
A spring retainer 70 in which split cotters 69, 69 are previously incorporated in a tapered insertion hole formed of a tapered hole is used as a valve spring 71A, 71B in a cylinder head 68.
The jig 62 is interposed between the pressing member 67 of the device 61 in FIG. 14 and the retainer 70, and the lever 66 is rotated to operate the retainer 70 with the pressing member 67. 15B, the valve stem 72 penetrates relatively through the center of the retainer 70 as shown in FIG.
Press down 9,69. In this state, the opening 6 of the jig 62 is
2a, a tool or a finger is inserted, and the engaging projection 69a of the cotter 69 is engaged with the engaging groove 7 on the peripheral surface of the upper end of the valve stem 72.
After the engagement with 2a, the depression of the retainer 70 by the jig 62 is released. Thereby, the valve spring 71
The retainer 70 is moved upward by the spring force of A, 71B, and the cotters 69, 69 are provided between the retainer 70 and the valve stem 72.
Is attached.

[0004] Also, in the case of the operation of removing the split cotters 69, 69 interposed between the retainer 70 and the valve stem 72, the cotter mounting operation is performed using the device 61 and the jig 62. Retainer 70 as in the case
15B, the cotters 69, 69 are exposed above the retainer 70 as shown in FIG. 15 (B). In this state, another cable-like detachment tool 92 having a magnet 91 attached to the tip is connected to the jig. The cotters 69, 69 which are inserted into the inside through the openings 62a of the 62 and are exposed are removed by being attracted by the magnet.

[0005] However, it is difficult to mount and remove the cotter using the device 61 and the jig 62 shown in FIG. That is, in this case, it is necessary to adjust the position of the cylinder head 68 several times in the front-rear and left-right directions in order to make the center of the pressing member 67 substantially coincide with the center of the valve stem 72. Further, the support posture of the cylinder header 68 is inclined, and the pressing member 67 of the device 61 presses the upper end of the jig 62 in a point contact state, so that the jig 62 may be displaced from the pressing member 67. Also, in the cotter mounting operation, FIG.
As shown in FIG. 5 (B), it is necessary to press the cotters 69, 69 from above, resulting in poor workability.

In addition, as a jig used for the cotter attaching operation, a jig having a configuration shown in FIG. 16 is also known (Japanese Patent Laid-Open No. 60-43108). The cotter mounting jig 74 includes an upper jig 75 in which a center guide 77, a cotter presser 78, and a retainer presser 79 are arranged concentrically.
It comprises a lower jig 76 for pushing up the valve 80 from below, and the cotters 69, 69 are mounted as follows.

That is, a state in which the spring retainer 70 in which the split cotters 69, 69 are fitted in the cotter insertion holes is placed on the upper end of the valve spring 71 (FIG. 16)
(A)), the retainer 70 is pushed down by the retainer presser 79 to raise the valve 80 relatively to the retainer 70, and push up the cotters 69, 69 to a position where the cotters 69, 69 protrude from the retainer 70 by the stem 80 a of the valve 80. (FIG. 16 (B)). Next, the cotter presser 78 is raised and retracted, and the center guide 77 is moved downward, so that the cotters 69, 69 are opened radially at their lower ends (FIG. 16C). Next, the valve 80 is pushed up by the lower jig 76, and the center guide 77 is raised and retracted, whereby the engagement protrusion 69a of the cotter 69 is opposed to the engagement groove 83 on the peripheral surface of the upper end portion of the valve stem 80a ( 16 (D) Next, the retainer presser 79 is raised and retracted, and the lower jig 76 is lowered and retracted, whereby the retainer 70 is relatively raised with respect to the valve 80, and the retainer 70 and the valve stem 80a. And cotters 69, 69 are attached between them (FIG. 16E).

However, in the above configuration, in addition to the upper jig 75, which is composed of three members, the center guide 77 for opening the cotter 69, the cotter presser 78, and the retainer presser 79,
Since the lower jig 76 is required, the configuration becomes complicated.

In addition, the center guide 77 is urged downward from the inner part (upper part) of the cotter presser 78 via a spring, so that the center guide 77 is pushed by the upwardly moving valve stem 80a. A jig having a configuration capable of ascending and retracting against the urging force of the spring is also known (Japanese Patent No. 2584484).

However, in the case of this configuration, a spring is required in addition to the three members of the center guide 77, the cotter presser 78 and the retainer presser 79, and the configuration is still complicated.

[0011] The present invention has been made in view of the above,
A cotter mounting jig, cotter removing jig and device that can smoothly perform a cotter attaching work to attach a cotter between an engine valve stem and a spring retainer and a cotter removing work to remove a cotter with a simple structure. The purpose is to provide.

[0012]

According to a first aspect of the present invention, there is provided a cotter mounting jig comprising a retainer for holding a valve spring of an engine and a tip end of a valve stem. A cotter mounting jig for mounting a split cotter holding a retainer at the tip end, the cotter mounting jig having a pressing force applying portion to which a pressing force is applied at one end, and the pressing portion being provided at the other end; A cylindrical main body that presses the retainer against the spring force of the valve spring toward the base end of the valve stem by force, and an insertion hole for inserting the distal end of the valve stem; A cotter holding member that is fitted movably in the direction to hold the cotter, and an elastic body that applies an elastic force toward the cotter to the cotter holding member, wherein the pressing end of the cotter holding member has the pressing force. Added Not in a natural state, having an outer diameter for engaging the cotter insertion hole for retaining the cotter in the retainer and performing centering with the retainer, and the retainer being pushed down by the main body toward the base end side of the valve stem. Accordingly, the cotter pressing member pushes down the cotter while making the tip of the valve stem intrude between the two cotters, and engages with the engagement groove of the valve stem.

[0013] According to the cotter mounting jig, the retainer is pressed by the pressing portion of the main body, and the pressing end of the cotter pressing member is fitted into the cotter insertion hole of the retainer to perform centering with the retainer. Since the cotter and the valve stem are also centered, the tip of the valve stem enters between the cotters and the cotter is relatively pushed down from the tip of the valve stem. By releasing the pressing of the retainer, the cotter engages with the engagement groove of the valve stem, so that the cotter can be mounted. Further, as described above, the tip end of the valve stem enters between the cotters by the holding end of the cotter holding member, so that a conventional center guide for opening the cotter is not required and the structure is simplified.

A cotter mounting jig according to a second aspect of the present invention, in the configuration of the first aspect, further includes an elastic force adjusting member for adjusting an elastic force by adjusting a length of the elastic body. .

According to the cotter mounting jig, the elastic force of the elastic body which applies the elastic force toward the cotter to the cotter holding member can be adjusted, so that the pressing force acting on the cotter and the valve stem from the cotter holding member can be adjusted appropriately. The value can be adjusted.

According to a third aspect of the present invention, there is provided a cotter mounting jig according to the first aspect, wherein the pressing end of the cotter pressing member comes into contact with the inner peripheral surface of the cotter and the main body is pushed down. The cotter has a tapered push-up surface that pushes the cotter in a radial direction.

According to the cotter mounting jig, since the retainer is pressed, the cotter pressing member is guided by the pressing surface at the pressing end of the cotter pressing member, and the cotter is pressed and opened in the radial direction. Between the valve stem and the cotter.

A cotter removing jig according to a fourth aspect of the present invention is provided between a retainer for holding a valve spring of an engine and a distal end of a valve stem, and supports the retainer at the distal end. A jig for removing a split cotter, having a pushing force applying portion to which a pushing force is added at one end, and using the pushing force at the other end to push the retainer against the spring force of the valve spring. A cylindrical body that presses the valve stem toward the proximal end thereof, an insertion hole into which the distal end of the valve stem is inserted, and a magnet body that is attached to the inner peripheral side of the body and attracts the cotter; When the retainer is pushed down toward the base end of the valve stem, the cotter is radially opened, disengaged from the engagement groove of the valve stem, and the cotter is attracted by the magnet body close to the cotter. It has to.

According to the cock removal jig, the tip of the valve stem relatively enters the insertion hole of the magnet body by pressing the retainer with the pressing portion of the main body,
The cotter is opened in the radial direction, comes off the engagement groove of the valve stem, and the cotter is attracted to the magnet body, so that the cotter can be removed smoothly.

According to a fifth aspect of the present invention, there is provided a cotter removal jig according to the fourth aspect, wherein the magnet body is fitted to the main body so as to be movable in the axial direction. An elastic body for applying an elastic force toward the cotter is provided.

According to the cock removing jig, when the retainer, the cotter, or the valve stem is pressed against the magnet body and a predetermined pressing force acts on the magnet body, the magnet body is automatically retracted upward. In addition, it is possible to prevent an excessive external force from being applied to the magnet body.

According to a sixth aspect of the present invention, there is provided a cotter removing jig according to the fourth or fifth aspect, wherein the main body is fitted on an outer periphery of the retainer to perform centering between the retainer and the retainer. It has an external fitting part for performing.

According to the cotter removal jig, the centering between the cotter removal jig and the retainer is performed by fitting the outer fitting portion of the main body to the outer periphery of the retainer. It will be easier.

According to a seventh aspect of the present invention, there is provided a cotter mounting device, comprising: a cotter split between a retainer for retaining a valve spring of an engine and a distal end of a valve stem; A base that tilts and supports the cylinder head so that the valve stem is vertical, and has a tiltable adjustable base, and a slide supported on the base so as to be slidable in the horizontal direction. And a knock pin provided on the slide table to fit into the knock pin hole of the cylinder head to perform positioning of the cylinder head with respect to the slide table, while receiving the pushing force and pushing down the retainer toward the base end side of the valve stem. A cotter mounting jig for engaging the cotter with the engaging groove at the tip of the valve stem, and applying the pushing force to the cotter mounting jig And a push that tool.

According to the cotter mounting apparatus, regardless of the type of engine, the valve head can be supported so that the balm stem is vertical, and the valve stem is correctly arranged directly below the cotter mounting jig which is pushed down by the pushing tool. Since the cylinder head can be positioned such that the cotter can be easily attached.

Further, in the cotter mounting device according to claim 8 of the present invention, in the configuration of claim 7, the knock pin is
Two sets of pin plates movably mounted on the slide table are provided eccentrically, and one set of pin plates is fixed to the slide table so that the rotation position around the central axis can be changed, and the other set of pin plates is Are fixed to a slide table so that both the rotation position about the central axis and the distance to one set can be changed.

According to the cotter mounting device, even when the positions of the knock pin holes of the cylinder head are various, the cylinder head can be stably positioned on the slide table, so that it can be used for various types of engines, and the versatility is increased accordingly. .

The cotter removing device according to a ninth aspect of the present invention is a split cotter which is interposed between a retainer for holding a valve spring of an engine and a distal end of a valve stem and which supports the retainer at the distal end. An apparatus for removing a cotter, wherein a cylinder head is inclined and supported so that a valve stem is vertical, and a base whose inclination angle is adjustable, and a base slidably supported on the base in a horizontal direction. A slide table, a knock pin provided on the slide table, which fits into a knock pin hole of the cylinder head to position the cylinder head with respect to the slide table, and receives the pushing force to move the retainer toward the base end side of the valve stem. The cotter removal jig for releasing the cotter from the engagement groove at the tip of the valve stem while pressing down, and the cotter removal jig And a push member for adding write power.

According to the cotter removing device, regardless of the type of engine, the valve stem can be supported so that the valve stem is vertical, and the valve stem is disposed immediately below the cotter removing jig pressed down by the pushing tool. Since the cylinder head can be positioned such that the cotter can be removed smoothly.

In the cotter removing device according to a tenth aspect of the present invention, in the configuration of the ninth aspect, the knock pin is eccentrically provided on two sets of pin plates movably mounted on the slide table. One set of pin plates is fixed to the slide base so that the rotation position around the center axis can be changed, and the other set of pin plates can change both the rotation position around the center axis and the distance to one set. It is fixed to the slide base.

According to the cotter removing device, even if the positions of the knock pin holes of the cylinder head are various,
Since the cylinder head can be positioned on the slide table,
Compatible with various types of engines, which increases versatility.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a cotter mounting apparatus according to one embodiment of the present invention. As shown in FIG. 8, the cotter mounting device 1
0, the valve spring 71 of the cylinder head 68
A, 71B, retainer 70 and valve stem 72
This device is used to attach a cotter 69 that holds the retainer 70 to the tip of the cotter. This device 1 has a base 2 that supports a cylinder head 68 at an angle so that a valve stem 72 shown in FIG.
The slide table 3 is slidably supported, a cotter mounting jig 4, and a pusher 5 that holds the cotter mounting jig 4 in a vertical posture and moves up and down. The cotter mounting jig 4 is a jig for engaging the cotters 69, 69 in two with an engaging groove 72a provided on the peripheral surface of the distal end portion of the valve stem 72 in FIG.

The base 2 shown in FIG. 1 comprises a base body 6 and an inclined support mechanism 7 for supporting the base body 6 in an inclined posture. As shown in FIG. 2, the tilt support mechanism 7 includes three tilt support plates 9 arranged on a horizontal base 8 in parallel with each other. Of the three inclined support plates 9, on the upper surfaces of the two inclined support plates 9 on both the left and right sides, an engagement pin 11 that engages with an engagement hole 10 (FIG. 3) formed in the base body 6. Each is protruding. On the horizontal base 8, three horizontal bases 12 corresponding to the respective inclined support plates 9 are fixed side by side, and a ball screw 13 is provided at one end of each horizontal base 12 so as to be rotatable. ing. A ball nut 14 is screwed into each of the ball screws 13.

One end of each inclined support plate 9 is formed in a bifurcated shape, and this bifurcated portion 9a is supported by a ball nut 1
4 is rotatably supported on the side. Thus, each tilt support plate 9 can adjust the tilt angle by rotating the corresponding ball screw 13 to move the ball nut 14 up and down. A roll member 16 for supporting the other end of the inclined support plate 9 is provided on the horizontal base 12 so that the other end of the inclined support plate 9 can smoothly move back and forth with the adjustment of the inclination angle. ing. On both sides of the horizontal base 12, guide pieces 17 for restricting the lateral displacement of the inclined support plate 9 are provided.

As shown in FIG. 3, a groove 18 is formed on the upper surface of the base body 6 so as to extend in the longitudinal direction which is the sliding direction H of the slide table 3. Roller belt 19 that slides smoothly
Is arranged. The roller belt 19 has a number of rollers held by a belt-shaped resin holder.
A guide ridge 20 for guiding the slide base 3 is provided at an end of the base body 6 facing the ball screw 13 and an end opposite to the end.

At the four corners of the upper surface of the slide base 3 shown in FIG. 1, two sets of disc-shaped pin plates 21A, 21A, 21
B and 21B are provided. These pin plates 21
A knock pin 22 that fits into a knock pin hole (not shown) formed on the lower surface of the cylinder head 68 to position the cylinder head 68 with respect to the slide table 3 is eccentrically protruded from the upper surfaces of A and 21B. I have. Slide stand 3
As shown in FIGS. 6A and 6B, circular plate fitting recesses 23A, 23A into which a pair of pin plates 21A, 21A are rotatably fitted are formed in two corners on the left side. The center portion thereof has an engagement hole 24A with which a shaft portion 21a projecting from the center of the lower surface of the pin plate 21A engages.
Are formed to penetrate. This plate fitting recess 23
By rotating the pin plate 21 </ b> A fitted into the pin A, the rotational position of the knock pin 22 can be variably adjusted. After this position adjustment, the pin plate 2
The shaft portion 21a of 1A is screwed through a screw 26 (FIG.
By tightening to the slide table 3 in (B)), the knock pin 22 is positioned.

At the two right corners of the slide base 3, another set of pin plates 21B, 21B are fitted to the slide base 3 so as to be rotatable and slidably fitted in the longitudinal direction of the slide base 3. Plate fitting recesses 23B, 23B are formed. On the bottom surface of the oval plate fitting recess 23B, an oval engagement hole 24B is formed in the longitudinal direction of the plate fitting recess 23B. It is formed. The pin plate 21 fitted in the plate fitting recess 23B
By rotating B, the rotational position of the knock pin 22 can be variably adjusted. By moving the knock pin 22 in the longitudinal direction along the engagement hole 24B, the set of pin plates 21A,
The distance from the knock pin 22 of 21A can be variably adjusted. After this position adjustment, the knock pin 22 is positioned by tightening the shaft portion 21a of the pin plate 21B from the lower surface side of the slide base 3 to the slide base 3 with the screw 26 (FIG. 6B) via the washer 25. .

Further, on the upper surface of the slide table 3, there is provided a guide groove 28 into which the valve support plate 27 is fitted so as to be adjustable in the left-right direction. The valve support plate 27 is
As shown in FIG. 8, the slide table 3 is
Valve stem 72 of cylinder head 68 supported above
When the angle of inclination is set to a vertical posture, the valve 73 facing the lower surface of the cylinder head 68 is supported on a horizontal plane. As shown in FIG. It has a mountain-shaped cross section, and an engagement projection 27a that engages with the guide groove 28 is formed on the lower surface. In the center of the upper surface of the valve support plate 27,
The valve support plate 2 is mounted on the slide table 3 shown in FIG.
An index recess 27b is formed as a guide when adjusting the position of the index 7.

The ball screw 13 of the slide table 3
A positioning member 29 composed of a male screw for positioning the slide base 3 at a desired slide position of the base body 6 is provided at an end facing the base and at an end facing the end.

The pusher 5 shown in FIG. 1 includes a column 37 protruding from the horizontal base 8 on the ball screw 13 side, and an arm 38 projecting upward from the column 37 to the upper side of the slide base 3. A jig pushing section 40 for holding and pressing the cotter mounting jig 4 in a vertical position is provided at the distal end of the arm 38.
Is supported at the lower end thereof so as to be able to move up and down freely. The lifting rod 39 is provided with a rack 41 extending vertically as shown in FIG. A pinion 42 that meshes with the rack 41 of the lifting rod 39 is provided inside the arm 38.
Reference numeral 2 denotes an operation lever 43 which can be rotated. By rotating the pinion 42 with the operation lever 43, the lifting rod 39 can be moved up and down.

FIG. 7 is a longitudinal sectional view of the cotter mounting jig 4. The cotter mounting jig 4 includes a cylindrical main body 47,
A fitting hole 47 formed concentrically on the inner peripheral side of the main body 47.
c, a cotter pressing member 48 movably fitted in the fitting hole 47c in the axial direction, and a coil spring which is an elastic body that applies an elastic force toward the cotter 69 (FIG. 8) to the cotter pressing member 48. 49.

One end (upper end) of the main body 47 is held by a jig pushing portion 40 at the lower end of the elevating rod 39 of the cotter attaching device 1, and a pushing force is applied by the pushing tool 5 of the cotter attaching device 1. It becomes the force applying unit 47a. Also,
At the other end (lower end) of the main body 47, valve springs 71A, 7A in the cylinder head 68 of the engine 60 in FIG.
A pressing portion 47b of FIG. 7 is formed, which comes into contact with the retainer 70 holding the 1B and protrudes in a ring shape for applying the pushing force to the retainer 70.

The leading end of the cotter pressing member 48 is a pressing end 48a, and an insertion hole 50 is formed in the pressing end 48a.
Are formed. Further, a tapered opening surface 48b is formed at the opening edge of the insertion hole 50 at the end surface of the pressing end portion 48a.

The holding end 48a is for holding the cotter 69 shown in FIG. The insertion hole 50 allows the tip of the valve stem 72 to be inserted. The holding end 48a is provided with a cotter insertion hole 70a in the retainer 70.
(FIG. 8). The cotter insertion hole 70 a is for inserting the tip of the valve stem 72 and holding the cotter 69. The push-opening surface 48b comes into contact with the inner peripheral surface of the cotter 69, and when the main body 47 is pressed down, the cotter 69 is divided into two.
Push 69 radially open.

The cotter pressing member 48 is screwed into a spring receiving member 51 disposed in an intermediate hole 47d having a diameter larger than the lower half portion of the main body 47 shown in FIG. They are connected at 52. In the main body 47, a stopper for regulating the downward movement of the spring receiving member 51 is formed by a step 47e between the fitting hole 47c and the intermediate hole 47d. The step portion 47e serves as a stopper to restrict the cotter pressing member 48 from moving downward from the inside of the main body 47 to a predetermined position or more.

Further, an elastic force adjusting member 53 for sandwiching the coil spring 49 between the spring receiving member 51 and the spring receiving member 51 is screwed into an upper half portion of the main body 47. By rotating the elastic force adjusting member 53 to variably set the screwing position, the length of the coil spring 49 is adjusted, and the elastic force of the coil spring 49 acting on the cotter pressing member 48 is adjusted. be able to. Thus, the pressing force acting on the cotter 69 and the valve stem 72 from the cotter pressing member 48 shown in FIG. 8 can be adjusted to an appropriate value.

Using the cotter mounting apparatus 1 (FIG. 1) having the above structure, the cotter 6 is divided into two parts between the retainer 70 of the cylinder head 68 and the tip of the valve stem 72.
The procedure of the work for mounting 9, 69 will be described below.

First, the inclination angle of the inclined support plate 9 shown in FIG. 2 is set according to the type of the engine to be subjected to the cotter attaching operation.
The adjustment is performed by rotating each ball screw 13 of the tilt support mechanism 7. Thereby, as shown in FIG.
The cylinder head 68 placed on the upper slide base 3 is in the inclined posture, and the valve stem 72 (FIG. 8) to be worked is in the vertical posture.

Next, two sets of pin plates 21A and 21B on the slide table 3 shown in FIG.
The positions of the knock pins 22 of the pin plates 21A and 21B are adjusted so as to fit into the respective knock pin holes (not shown) on the lower surface of the cylinder head 68 (FIG. 5). B)) to fix the pin plates 21A and 21B to the slide base 3.

The cylinder head 68 is placed on the slide base 3 on which the positions of the knock pins 22 have been adjusted in such a manner that the respective knock pin holes on the lower surface of the cylinder head 68 shown in FIG. Position. Further, the valve support plate 27 is moved so that the corresponding valve of the cylinder head 68 is received on the inclined surface of each valve support plate 27 disposed on the slide base 3 as shown in FIG.
Is moved in the longitudinal direction (horizontal direction) H along the guide groove 28 to adjust the position. In this position adjustment, as shown in FIG. 4, each plug hole 74 in the cylinder head 68 is inserted into the corresponding index recess 27 of the valve support plate 27 shown in FIG.
By positioning the valve support plate 27 so that b can be seen, the valve support plate 27 can be positioned at a position supporting the corresponding valve.

In this manner, regardless of the type of the engine 60, the cylinder head 68 can be supported so that the valve stem 72 of FIG. 8 is vertical, and the cylinder head 68 can be positioned on the slide base 3, so that many Various types of engines 60 can be supported, and versatility is increased accordingly.

Next, the slide base 3 is moved relative to the base body 6 so that the valve stem 72 to be worked in the cylinder head 68 shown in FIG. Is manually slid horizontally, and then the slide table 3 is positioned on the base body 6 by the positioning member 29 (FIG. 6A). Further, FIG.
The retainer 70 is set on the valve springs 71A and 71B corresponding to the valve stem 72 to be worked as shown in FIG. Two cotters 69, 69 are pre-installed in the tapered portion below the cotter insertion hole 70a in the retainer 70.

In the state set as above, as shown in FIG. 4, the cotter mounting jig 4 is gripped by hand and positioned just below the jig pressing portion 40 of the pressing tool 5 to operate the pressing tool 5. The lever 43 is rotated to move the lifting rod 39 downward. As a result, as shown in FIG. 9A, first, the pressing portion 47b of the main body 47 of the cotter mounting jig 4 comes into contact with the retainer 70, and the cotter pressing end 48a is connected to the retainer 7a.
The center is fitted to the retainer 70 by fitting into the upper circumferential portion of the 0 cotter insertion hole 70a. Thereby, the subsequent cotter attaching work can be performed properly.

Then, the lifting rod 39 is further moved down, and the pushing force is applied from the pressing portion 47 b of the main body 47 to the retainer 70.
As shown in FIG. 9B, when the retainer 70 is pressed toward the base end (lower side) of the valve stem 72 against the spring force of the valve springs 71A and 71B, the valve stem relatively moves. The tip of 72 enters the cotter insertion hole 70 a of the retainer 70. Thereby, first, the cotter 6
Until 9 is pressed by the pressing end 48a of the cotter pressing member 48, it is pushed up at the tip of the valve stem 72, after which only the valve stem 72 moves upward. When the upward movement of the cotter 69 is regulated by the pressing end portion 48a of the cotter pressing member 48, the cotter 69 is guided by the tapered opening surface 48b of the pressing end portion 48a and is pushed and opened in the radial direction. Thereby, the cotter mounting operation can be performed more appropriately.

Further, the elevating rod 39 is moved downward so that the distal end of the valve stem 72 enters the insertion hole 50 of the cotter pressing member 48 as shown in FIG. The retainer 70 is pressed so that the engagement groove 72a is positioned above the cotter 69.

Thereafter, the lifting rod 39 (FIG. 1) is moved up to move the cotter mounting jig 4 up and down, and the retainer 70 is moved upward.
Release the pressing force. As a result, as shown in FIG. 9D, the retainer 70 moves the valve springs 71A, 71A.
The valve stem 72 returns upward by the spring force of B, and the valve stem 72 moves downward relative to the retainer 70. As a result, the engagement protrusion 69a of the cotter 69 engages with the engagement groove 72a at the tip of the valve stem 72. That is, the two cotters 69, 6 are provided between the retainer 70 and the tip of the valve stem 72.
9 is attached. In this way, the cotter mounting operation can be performed smoothly.

FIG. 10 is a longitudinal sectional view of the cotter removal jig 54. The cotter removal jig 54 is provided with the retainer 70 and the valve stem 72 in the engine 60 shown in FIG.
Cotter 6 attached to the tip of the cotter
This is a jig for removing 9, 69, and is pushed by a jig pushing portion 40 at the lower end of the lifting rod 39 in the cotter attaching apparatus 1 shown in FIG. That is, the cotter mounting device 1 is replaced with a cotter removing jig 5 instead of the cotter mounting jig 4.
4, the cotter removing device 100 is obtained.

The cotter removing jig 54 shown in FIG. 10 has a cylindrical main body 47 and a fitting hole 47f formed on the inner peripheral side of the main body 47.
A cotter attracting cylindrical magnet body 55 fitted movably in the axial direction to the diaper, and a coil spring 49 as an elastic body for applying an elastic force toward the cotter 69 (FIG. 8) to the magnet body 55 are provided. . In the configuration of the cotter removing jig 54, members having the same reference numerals as those of the cotter attaching jig 4 described above indicate equivalent members.

An outer fitting portion 47j is formed on the outer periphery of the pressing portion 47b at the lower end of the main body 47.
j fits around the outer periphery of the retainer 70 shown in FIG. 11 and performs centering with the retainer 70.

The magnet 55 shown in FIG. 10 is made of a permanent magnet.
An inner peripheral side of the main body 47 is connected by a spigot connection to a lower end of another shaft member 56 which is movably fitted in another fitting hole 47g in the axial direction. The magnet 55 and the shaft member 5
6 may be constituted by an integral permanent magnet. The inner peripheral side of the magnet 55 is formed as an insertion hole 57 into which the tip of the valve stem 72 is inserted.

The shaft member 56 is connected to the shaft member 5 in the main body 47.
The intermediate hole 4 having a diameter larger than the fitting hole 47g into which the hole 6 is fitted.
It is connected to a spring receiving member 51 arranged at 7c by a screw 52. Accordingly, the step portion 47e also serves as a stopper, and the lowering of the magnet body 55 from the inside of the main body 47 to a predetermined position or more is restricted.

Further, the elastic force adjusting member 53 for sandwiching the coil spring 49 with the spring receiving member 51 is screwed to the upper half portion of the main body 47, Same as in the case. This elastic force adjusting member 53
Is rotated to set the screwing position variably, the length of the coil spring 49 is adjusted, and the elastic force of the coil spring 49 acting on the magnet 55 can be adjusted.

Thus, in the cotter removing operation,
When the retainer 70, the cotters 69, 69, or the valve stem 72 is pressed against the magnet body 55 and a predetermined pressing force acts on the magnet body 55, the magnet body 55 is automatically retracted upward. An unreasonable external force can be prevented from being applied to the magnet body 55.

The cotter removal jig 54 is pushed in by the jig pushing section 40 of the cotter mounting apparatus 1 shown in FIG.
The procedure for removing the split cotters 69, 69 interposed between the retainer 70 and the tip of the valve stem 72 will be described below. The procedure for positioning the cylinder head 68 of FIG. 4 to be subjected to the cotter removal work on the slide base 3 and the procedure for positioning the slide base 3 on the base body 6 are the same as those in the case of the cotter mounting work described above. Here, the description is omitted.

By rotating the operation lever 43 of the pushing tool 5 to move the lifting rod 39 downward, FIG.
As shown in (1), first, the outer fitting portion 47j of the main body 47 in the cotter removal jig 54 is fitted to the outer periphery of the retainer 70, and the centering is performed with the retainer 70. As a result, the subsequent cotter removal operation can be performed more appropriately. Also, at this time, since the magnet body 55 approaches the retainer 70, the cotter removal jig 54 is strongly coupled to the retainer 70 by the magnetic force, and the cotter removal jig 54
Can be prevented from being displaced.

Then, the lifting rod 39 (FIG. 1) is further moved downward, and a pushing force is applied from the main body 47 to the retainer 70, as shown in FIG.
When the pressing portion 47b presses the retainer 70 toward the base end side of the valve stem 72 against the spring force of 1A, 71B, the distal end of the valve stem 72 relatively moves from the cotter insertion hole 70a of the retainer 70 to the magnet body 55. Into the insertion hole 57. Along with this, the cotter 69 moved upward together with the valve stem 72 expands in the radial direction by moving to the upper portion where the inner diameter of the cotter insertion hole 70a is large, and the cotter 69 moves to the engagement groove 72a at the tip end of the valve stem 72. The engagement of the engagement projection 69a of the cotter 69 is released, and the magnet pair 55
Is adsorbed.

Thereafter, the lifting rod 39 (FIG. 1) is moved upward to move the cotter removal jig 54 up and away, and the pressing force on the retainer 70 is released. As a result, FIG.
As shown in (5), the cotter 69 attracted to the magnet 55 is lifted and taken out from the cotter insertion hole 70a of the retainer 70.

In this way, the cotter removing operation can be performed smoothly.

In the cotter removal jig 54, the magnet body 55 is constituted by a permanent magnet, but may be constituted by an electromagnet, and a magnetic force may be selectively generated by turning on / off a switch. In the case of such a configuration, the cotter 69 is attracted by the magnet body 55 and taken out from the cotter insertion hole 70a of the retainer 70, and then the switch is turned off to release the magnetic force of the magnet body 55. The cotter 69 can be removed from the removal jig 54 by hand.

In the cotter removal jig 54, the magnet body 55 is connected to the lower end of the shaft member 56, but is directly fixed in the fitting hole 47h of the lower end of the main body 47 as shown in FIG. The insertion hole 57 of the valve stem 72 may be formed from the magnet body 55 to a position above the magnet body 55 arrangement portion of the main body 47. Thereby, the configuration can be further simplified.

[0071]

As described above, according to the cotter mounting jig of the first aspect of the present invention, the retainer is pressed by the pressing portion of the main body, and the pressing end of the cotter pressing member is inserted into the cotter insertion hole of the retainer. By fitting and centering with the retainer, the cotter and the valve stem are also centered, so that the tip of the valve stem enters between the cotters and the relative Since the cotter is pushed down from the tip of the valve stem and the pressing of the retainer is released, the cotter engages with the engagement groove of the valve stem.
The cotter can be mounted smoothly. Also,
Since the distal end of the valve stem enters between the cotters by the pressing end of the cotter pressing member, a conventional center guide for opening the cotter is not required, and the structure is simplified.

Further, according to the cotter removing jig of the fourth aspect of the present invention, by pressing the retainer with the pressing portion of the main body, the distal end portion of the valve stem relatively enters the insertion hole of the magnet body. Since the cotter is opened in the radial direction, the cotter is disengaged from the engagement groove of the valve stem, and the cotter is attracted to the magnet body, the cotter can be removed smoothly.

According to the cotter mounting device of the present invention, the cylinder head can be supported so that the balm stem is vertical regardless of the type of engine.
Since the cylinder head can be positioned so that the valve stem is correctly positioned directly below the cotter mounting jig pressed down by the pushing tool, the cotter mounting operation can be performed smoothly.

According to the cotter removing apparatus of the ninth aspect of the present invention, the cylinder head can be supported so that the valve stem is vertical regardless of the type of engine, and the cotter removing jig which is pushed down by the pushing tool is provided. Since the cylinder head can be positioned so that the valve stem is correctly positioned just below the cotter, the cotter removal operation can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cotter attachment / detachment device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state of the cotter attaching / detaching device before attaching a base body.

FIG. 3 is a perspective view showing a state of the cotter mounting / removing device before mounting a slide table.

FIG. 4 is a perspective view showing a cotter attaching operation by the cotter attaching / detaching device.

FIG. 5 is a side view showing a schematic configuration of the cotter attaching / detaching device.

FIG. 6A is a plan view of a slide table in the cotter attaching / detaching device, and FIG. 6B is a sectional view taken along the line VI-VI of FIG.

FIG. 7 is a longitudinal sectional view of a cotter attaching jig attached to the cotter attaching / removing device.

FIG. 8 is a longitudinal sectional view showing a state immediately before a cotter attaching operation by the cotter attaching jig.

FIG. 9 is a process diagram showing a cotter attaching operation using the cotter attaching jig.

FIG. 10 is a longitudinal sectional view of a cotter removal jig that can be attached to the cotter attachment / removal device.

FIG. 11 is a process diagram showing a cotter removing operation using the cotter removing jig.

FIG. 12 is a longitudinal sectional view showing a main part of another example of the cotter removal jig.

FIG. 13 is a perspective view showing a conventional example of an apparatus used for cotter attaching / detaching work.

FIG. 14 is a perspective view showing a cotter attaching operation by the same device.

FIG. 15 is an explanatory diagram of a cotter attaching operation by the same device.

FIG. 16 is a process diagram showing a cotter mounting operation according to another conventional example of a cotter mounting jig.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cotta mounting device, 2 ... Base, 3 ... Slide table, 4
... Cotta mounting jig, 5 ... Pressing tool, 21A, 21B ... Pin plate, 22 ... Dowel pin, 47 ... Main body, 47a ... Pressing force applying section, 47b ... Pressing section, 47j ... External fitting section, 48 ...
Cotter pressing member, 48a: pressing end, 48b: pressing surface, 49: coil spring (elastic body), 50: insertion hole, 54
... Cotta removal jig, 55 ... Magnet body, 60 ... Engine,
69 ... cotter, 70 ... retainer, 70a ... cotter insertion hole, 71A, 71B ... valve spring, 72 ... valve stem, 72a ... engagement groove, 100 ... cotter removal device

Continued on the front page (72) Inventor Kazuhiko Yamamoto 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Inside the Akashi Factory (72) Inventor Takeshi Asano 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries Inside the Akashi Factory (72) Inventor Yuki Sera 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Inside the Akashi Factory (72) Inventor Akihiro Shimagami 1-1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries (56) References JP-A-8-155563 (JP, A) JP-A-3-103128 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23P 21 / 00 303 F01L 3/24

Claims (10)

(57) [Claims] 1. A cotter mounting jig for mounting a split cotter for holding a retainer to a front end of a valve stem between a retainer for holding a valve spring of an engine and a front end of a valve stem, A cylindrical body that has a pushing force applying portion to which a pushing force is added, and that presses the retainer toward the base end side of the valve stem by the pushing force at the other end against the spring force of the valve spring. A cotter holding member that has an insertion hole for inserting the distal end portion of the valve stem and is movably fitted in the axial direction on the inner peripheral side of the main body to hold the cotter; and an elastic force toward the cotter to the cotter holding member. A cotter insertion hole having a tapered portion for holding the cotter in a retainer in a natural state where the pressing force is not applied to the cotter pressing member. An outer diameter for fitting and centering with a retainer, wherein the retainer is pushed down toward the base end side of the valve stem by the main body, so that the cotter pressing member has a valve between two cotters; A cotter mounting jig that pushes down the cotter while engaging the tip of the stem to engage with the engagement groove of the valve stem. 2. A cotter mounting jig according to claim 1, further comprising an elastic force adjusting member for adjusting an elastic force by adjusting a length of said elastic body. 3. A taper-shaped presser according to claim 1, wherein the presser end of said cotter presser member comes into contact with an inner peripheral surface of said cotter and presses said cotter in a radial direction by pushing down said main body. A cotter mounting jig having an open surface. 4. A cotter removal jig interposed between a retainer for holding a valve spring of an engine and a distal end of a valve stem for removing a split cotter supporting a retainer at the distal end. A cylindrical portion having a pushing force applying portion to which a pushing force is added at one end, and pressing the retainer toward the base end side of the valve stem by the pushing force at the other end against the spring force of the valve spring. A main body having an insertion hole for inserting a distal end portion of the valve stem, the magnet body being attached to an inner peripheral side of the main body and adsorbing a cotter, and a retainer directed toward the base end side of the valve stem by the main body. A cotter removal jig that opens the cotter in the radial direction by being pushed down, disengages from the engagement groove of the valve stem, and attracts the cotter by the magnet body close to the cotter. 5. The cotter according to claim 4, wherein the magnet body is fitted to the main body movably in the axial direction, and further includes an elastic body that applies an elastic force toward the cotter to the magnet body. Removal jig. 6. The method according to claim 4, wherein the main body comprises:
A cotter removal jig provided with an outer fitting portion that fits on the outer periphery of the retainer and performs centering between the retainer and the retainer. 7. A cotter mounting device for mounting a split cotter for holding a retainer at a tip between a retainer for holding a valve spring of an engine and a tip of a valve stem, the valve stem comprising: A base that tilts and supports the cylinder head so that it is vertical, and has an adjustable tilt angle; a slide base that is slidably supported on the base in a horizontal direction; and a cylinder that is provided on the slide base. A knock pin that fits into the knock pin hole of the head to position the cylinder head with respect to the slide base. A cotter mounting jig to be engaged with the cotter mounting jig; and a pressing tool for applying the pressing force to the cotter mounting jig. . 8. The knocking pin according to claim 7, wherein the knock pins are eccentrically provided on two sets of pin plates movably mounted on the slide table, and one of the sets of pin plates is rotated about a central axis. A cotter mounting device wherein the other set of pin plates is fixed to the slide table so that both the rotational position about the central axis and the distance to one set are changeable. 9. A cotter removal device interposed between a retainer for holding a valve spring of an engine and a distal end of a valve stem for removing a split cotter for supporting the retainer at the distal end, A base that tilts and supports the cylinder head so that the valve stem is vertical and that has an adjustable tilt angle; a slide base that is slidably supported on the base in a horizontal direction; and a slide base that is provided on the slide base. A knock pin that fits into the knock pin hole of the cylinder head to position the cylinder head with respect to the slide table, and a cotter engages the tip of the valve stem while receiving the pushing force and pushing down the retainer toward the base end of the valve stem A cotter removal jig for detaching from the mating groove; and a pushing tool for applying the pushing force to the cotter removal jig. Jitter removal apparatus. 10. The knock pin according to claim 9, wherein the knock pin is eccentrically provided on two sets of pin plates movably mounted on the slide table, and one of the sets of pin plates is rotated about a central axis. A cotter removal device wherein the pin plate of the other set is variably fixed to the slide base, and the other set of pin plates is fixed to the slide base such that the rotational position about the central axis and the distance to one set are both changeable.