JP2014030885A - Valve assembling tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve assembling tool capable of easily and surely fitting and assembling a cotter in a gap between a valve stem of an engine and a center hole of a retainer.SOLUTION: By pressing down a handle 36 by an operator, a holder 48 moves a cotter 20 and a retainer 82 to a valve side against the elastic forces of valve springs 98 and 100 during a period from the abutment of a lower end of a spindle 50 in a valve stem 76 to the abutment of an upper end of the spindle 50 in a tool body. Using pushing-back of the retainer and the cotter by the elastic force of the valve spring when the press-down force is weakened, the retainer is assembled to the valve stem via the cotter.

Description

  The present invention relates to a valve assembly tool for assembling intake and exhaust valves to an engine cylinder head.

  When performing maintenance on intake valves and exhaust valves on automobiles and motorcycles, manual tools are used to remove and install each component, but installation is particularly difficult. It is a laborious work.

  As this type of conventional tool as described above, for example, a valve assembly tool as disclosed in Patent Document 1 is known.

  The valve assembling tool includes a hollow cylindrical retainer press, a lock press provided inside the retainer press so as to be movable forward and backward, and a screw rotatably provided on the upper portion of the retainer press and screwed into an arm. A rod spring is inserted into the stem of the valve, and a valve spring retainer and retainer lock (also called a cotter) are inserted in the lower part of the lock press to fix the arm to the cylinder head. Rotate the screw rod in the tightening direction.

  As a result, the retainer press moves toward the valve side, and accordingly, the valve spring is compressed by the retainer press, and the valve spring retainer and the retainer lock (cotter) together with the lock press are also moved to the outer peripheral side of the stem portion. Moving. As a result, the valve spring retainer is further pushed down even when the retainer lock (cotter) moved to the outer peripheral side of the stem portion reaches a position where it is engaged with the groove portion of the stem portion. Next, when the screw rod is rotated in the loosening direction, the compressed valve spring is extended and the valve spring retainer is pushed up. The central hole part of the valve spring retainer has a conical shape whose cross section extends upward, so that the retainer lock (cotter) slides on the outer surface of the valve stem toward the center hole with the valve spring retainer tightened from the outside. Move closely. As a result, the retainer lock (cotter) is engaged and fixed in the groove of the valve stem in a state where the retainer lock (cotter) is fitted in the gap between the central hole of the valve stem and the valve spring retainer, and the spring to the valve stem Retainer assembly is complete.

Japanese Utility Model Publication No. 5-63774

  In the valve assembly tool according to the above-described prior art, the spring, the valve spring retainer, and the retainer lock are assembled while being temporarily placed on the valve and the valve assembly tool, respectively. There is a problem that it is a laborious work that is difficult to mount due to the positional relationship.

  In addition, when performing the assembly work of the valve, it is necessary to rotate the screw rod and move the retainer press forward and backward with the spring, the valve spring retainer and the retainer lock in pairs. In addition, there is a problem that care is required in the operation so that the valve stem and the valve guide disposed on the back side of the valve stem are not pushed into a position where they touch the stem seal for sealing.

  The present invention has been made in consideration of the above-described problems. When the retainer is fixed to the valve stem in the cylinder head of the engine, the cotter can be easily and reliably inserted into the gap between the valve stem of the engine and the central hole of the retainer. An object of the present invention is to provide a valve assembly tool that can be fitted and assembled into a valve.

In order to achieve the above object, the present invention provides a valve for assembling a plurality of cotters in a gap formed by a central hole of a retainer for locking a valve stem of an intake or exhaust valve provided in an internal combustion engine and a valve spring. Assembly tool,
A tool body having a lower end opened and a handle for gripping provided on the upper end;
A spindle provided in the tool body so as to be vertically displaceable via a spring and capable of contacting the valve stem;
A holder provided in the tool body so as to be relatively displaceable in the vertical direction with respect to the spindle with respect to the spindle, and capable of contacting the cotter and the retainer;
With
When the handle is pushed down, the holder causes the cotter and retainer to move between the lower end of the spindle and the valve stem until the upper end of the spindle comes into contact with the tool body. It is characterized by being moved toward the valve side against the generated force.

  According to the present invention, when the operator depresses the handle, the holder is not elastic of the valve spring from when the lower end of the spindle contacts the valve stem until the upper end of the spindle contacts the tool body. The cotter and retainer are moved toward the valve against the force.

  Therefore, the movement amount to the valve side when the holder in contact with the cotter and the retainer moves to the lower end side of the tool body can be limited to a predetermined range.

  As a result, when the handle is pushed down, the holder is prevented from moving too far to the valve side, and the cotter abutting on the holder is moved by an appropriate predetermined amount by a simple operation in which the operator pushes down the handle. The cotter can be securely fitted into the gap between the valve stem and the center hole of the retainer using the elastic force of the valve spring, and the retainer can be fixed to the valve stem via the cotter. It becomes possible.

  The handle may be attached to the tool body via a hollow cylinder, and the hollow cylinder may be provided with an adjustment mechanism capable of adjusting a distance of a predetermined amount of movement of the spindle from the upper surface of the handle.

  Furthermore, the adjustment mechanism may be an adjuster that approaches and separates from the spindle by adjusting the amount of rotation from the upper surface of the handle.

  Furthermore, the holder may be provided with a magnet at the end on the valve side.

  Furthermore, the holder may be provided with a nonmagnetic elastic body between the end on the valve side and the magnet.

  In addition, the holder may have a holding part that regulates the posture of the retainer during movement.

  According to the present invention, the following effects can be obtained.

  That is, when the holder in contact with the cotter and the retainer moves to the lower end side of the tool body, only after the lower end part of the spindle comes into contact with the valve stem until the upper end part of the spindle comes into contact with the tool body. By making it movable, the amount of movement of the holder toward the valve can be limited to a predetermined amount. As a result, when the operator depresses the handle, the holder is prevented from moving too far to the valve side, and the cotter in contact with the holder is moved by a predetermined amount by a simple operation of depressing the handle, and the valve Using the elastic force of the spring, the cotter can be securely fitted into the gap between the valve stem and the center hole of the retainer and assembled, and the retainer can be fixed to the valve stem via the cotter.

1 is an overall cross-sectional view of a valve assembly tool according to an embodiment of the present invention. It is the top view which looked at the valve assembly tool from the handle side. It is an expanded sectional view which shows the case where the adjuster of the valve assembly tool is rotated using the adjustment tool. It is sectional drawing which shows the state which set the valve assembly tool to the valve position before pushing down a handle. It is sectional drawing which shows the state before attaching a cotter, a retainer, and an outer spring with respect to the tool for valve | bulb assembly. It is sectional drawing which shows the state which set the valve assembly tool to the valve position and started pushing down the handle. FIG. 7 is a cross-sectional view showing a state where the handle is further pushed down from the state of FIG. 6 and the spindle is in contact with the valve stem. 8A is a cross-sectional view showing a state where the handle is further pushed down from the state shown in FIG. 7, and FIG. 8B is an enlarged cross-sectional view showing a state near the end of the valve stem in FIG. 8A. 9A is a cross-sectional view showing a state where the handle is further pushed down from the state shown in FIG. 8A, and FIG. 9B is an enlarged cross-sectional view showing a state in the vicinity of the end portion of the valve stem in FIG. 9A. FIG. 10A is a cross-sectional view showing an assembled state in which the push-down force of the handle is weakened in the state of FIG. 9A and the cotter is engaged with the annular groove, and FIG. 10B shows a state in the vicinity of the end portion of the valve stem in FIG. It is an expanded sectional view shown. It is sectional drawing which shows the assembly completion state of the valve | bulb with which the cotter and the retainer were mounted | worn. It is a schematic explanatory drawing which shows the mutual positional relationship of the state in which the cotter was assembled | attached with respect to the valve stem, and the state where this cotter moved below exceeding the annular groove of the valve stem. It is an expanded sectional view of the tool for valve | bulb assembly | attachment which shows the example of a holder shape in the case of removing the cotter and retainer assembled | attached to the valve | bulb.

  A preferred embodiment of a valve assembly tool according to the present invention will be described below and described in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates a valve assembly tool according to an embodiment of the present invention.

  As shown in FIG. 1, the valve assembly tool 10 includes a body (tool body) 12, a cap 14 coupled to the upper end portion of the body 12, and a guide body 16 coupled to the lower end portion of the body 12. And a retainer 82 that is provided inside the guide body 16 so as to be displaceable and is assembled to the valve 18 described later, and a holder mechanism 22 that can hold the cotter 20.

  The body 12 is formed in a cylindrical shape having an outer peripheral surface having a substantially constant diameter, and a body hole 24 is formed through the central portion along the axial direction (arrow A, B direction). The first spring 26 described later is inserted.

  The cap 14 is fixed to the upper end portion of the body 12 by screwing, and an adjuster hole 30 into which an adjuster 28 (adjustment mechanism), which will be described later, is inserted is axially (in the directions of arrows A and B). Penetrates along. The adjuster hole 30 communicates with the body hole 24, an internal thread is formed on the inner peripheral surface thereof, and a thread portion 32 of an adjuster 28 described later is screwed.

  Further, a connecting shaft (hollow tube portion) 34 having a predetermined length in the axial direction is formed at the upper end portion of the cap 14, and an operator (not shown) attaches a valve assembly tool to the upper end portion of the connecting shaft 34. A handle 36 is provided for gripping when using 10. Inside the connecting shaft 34 and the handle 36, an adjuster hole 30 penetrating along the axial direction is formed.

  The adjuster 28 is composed of a shaft body having a predetermined length along the axial direction (the directions of arrows A and B). The adjuster 28 is inserted into the adjuster hole 30 and a screw portion 32 formed in the vicinity of the lower end portion is a cap. It is screwed into a female thread portion provided on the inner peripheral wall of the 14 adjuster holes 30.

  As shown in FIGS. 1 and 2, a groove 38 is formed at the end of the adjuster 28 on the side of the handle 36. For example, as shown in FIG. The adjuster 28 can be rotated while being inserted into the groove portion 38, and the adjuster 28 screwed into the cap 14 can be moved along the axial direction (directions of arrows A and B).

  As shown in FIG. 2, a scale 42 for confirming the rotational operation amount of the adjuster 28 is provided at the end of the connecting shaft 34 on the handle 36 side, and the rotational operation amount (rotation angle) of the groove 38 is graduated. By confirming based on 42, the movement distance of the adjuster 28 in the axial direction can be confirmed. For example, it is possible to confirm the amount of movement of the adjuster 28 on the scale 42 by setting the adjuster 28 to rotate by a predetermined distance (for example, 1 mm) by rotating the adjuster 28 once.

  As shown in FIG. 1, the guide body 16 is formed in a cylindrical shape having a predetermined length along the axial direction (the directions of arrows A and B), and the upper end of the guide body 16 with respect to the outer peripheral surface of the lower end of the body 12. An opening 44 that opens to the outside is formed at the lower end. Further, the guide body 16 is formed with a substantially constant inner peripheral diameter, and a stepped portion 46 that protrudes inward on the lower end side (in the direction of arrow A) is formed.

  Inside the guide body 16, a holder mechanism 22 capable of holding the retainer 82 and the cotter 20 is provided along the guide body 16 so as to be movable in the axial direction (directions of arrows A and B).

  The holder mechanism 22 includes a holder 48 that is in sliding contact with the inner peripheral surface of the guide body 16, a spindle 50 that is displaceable in the axial direction (arrow A and B directions) with respect to the holder 48, and the holder 48 and the body 12. And a second spring 52 interposed therebetween. The holder 48 includes, for example, an annular holder main body 54, a protrusion 56 in which the central portion of the holder main body 54 protrudes upward (second spring 52 side), and the center of the holder main body 54 and the protrusion 56. And an insertion hole 58 penetrating in the axial direction (direction of arrows A and B). The holder 48 is restricted from moving toward the opening 44 at a position where it abuts on a stepped portion 46 formed on the opening 44 side (arrow A direction) of the guide body 16.

  The end of the holder main body 54 on the opening 44 side includes a first holding part 60 capable of holding a retainer 82 to be described later and a second holding part 62 capable of holding the cotter 20. Is formed in an annular recess with respect to the end surface of the holder main body portion 54, and the second holding portion 62 is formed by further recessing the central portion of the first holding portion 60 to a small diameter. The second holding part 62 is formed so as to face the first holding part 60.

  The first and second holding portions 60 and 62 are formed concentrically with respect to the insertion hole 58, and a ring body 64 made of an elastic material such as rubber is attached to the second holding portion 62.

  The insertion hole 58 is provided with a cylindrical magnet 66 in an annular groove 78 formed on the inner peripheral surface and facing the second holding portion 62, and is adjacent to the end of the ring body 64.

  The spindle 50 is inserted into the body hole 24 and is movable in the axial direction along the inner wall of the body hole 24. The spindle 50 is formed at both ends of the large diameter part 68, respectively. The first and second small-diameter portions 70 and 72 are formed so as to protrude from the large-diameter portion 68 in a direction having a small diameter and separated from each other, and the inside of the guide body 16 and the body 12 is axially formed. It is provided to be freely movable.

  As will be described later, the first small diameter portion 70 abuts against the lower end portion of the adjuster 28 under the displacement action of the body 12 and the like when the operator pushes down the handle 36. On the other hand, the second small-diameter portion 72 is inserted into the insertion hole 58 of the holder 48, and the tip portion thereof protrudes from the lower end portion of the holder 48, and the displacement of the spindle 50 by pushing down the handle 36 as will be described later. To the upper end of the valve stem 76 of the valve 18.

  Further, the first spring 26 is interposed between the end surface of the spindle 50 on the first small diameter portion 70 side and the lower end portion of the adjuster 28, and the elastic force of the first spring 26 separates the spindle 50 from the adjuster 28. That is, it is biased downward (in the direction of arrow A).

  The second spring 52 is interposed between the outer end surface of the guide portion 73 formed at the lower end portion of the body 12 and the outer end surface of the protrusion 56 of the holder main body portion 54. The elastic force of the second spring 52 urges the holder 48 away from the body 12, that is, downward (in the direction of arrow A), and the holder 48 is stepped by the elastic force. It is held in a state of being pressed against the portion 46.

  Next, the valve 18 assembled by the above-described valve assembly tool 10 will be briefly described with reference to FIG.

  The valve 18 includes, for example, a valve head 74 formed of a metal material and formed in a disk shape, and a shaft-shaped valve stem 76 that stands upward from the center of the valve head 74. Is attached to a cylindrical valve guide 86 press-fitted into the valve hole 90 of the cylinder head 88 so as to be movable up and down. In addition, an annular groove 78 is formed in the vicinity of the upper end of the valve stem 76. The annular groove 78 is recessed in a semicircular cross section radially inward with respect to the outer peripheral surface. The valve stem 76 and the valve guide are formed at the upper end of the valve guide 86. A stem seal 92 for sealing 86 is attached.

  The retainer 82 attached to the valve stem 76 includes, for example, a disc-shaped flange portion 84 (see FIG. 8B) formed of a metal material, and gradually increases from the upper end portion toward the lower end portion at the center thereof. A central hole 82a is formed so as to be reduced in diameter. The cotter 20 fitted and fixed between the valve stem 76 and the retainer 82 is formed, for example, by dividing a cylindrical body formed in a substantially tapered shape from a steel material into two parts.

  On the inner peripheral surface of the upper end portion of the cotter 20, a convex portion 80 (see FIG. 8B) protruding in the radial inward direction is formed along the circumferential direction. When the cotter 20 is mounted on the outer peripheral side of the valve stem 76, the convex portion 80 is engaged with the annular groove 78, whereby the cotter 20 is positioned and fixed with respect to the valve stem 76 (FIG. 11). reference). Further, the outer peripheral surface of the cotter 20 corresponds to a center hole 82a of a retainer 82, which will be described later, and is formed in a tapered shape that gradually decreases in diameter from the upper end portion toward the lower end portion.

  The valve assembly tool 10 according to the embodiment of the present invention is basically configured as described above. Next, the cotter 20 and the retainer 82 are assembled to the valve stem 76 of the valve 18. Will be described.

  First, as shown in FIG. 4, the upper end side (in the direction of arrow B) of the valve stem 76 is exposed to the outside of the cylinder head 88, and a spring holder 96 and an inner spring (valve spring) are placed on the outer periphery thereof. ) 98 is inserted, and the lower end of the inner spring 98 is brought into contact with the spring holder 96. The valve 18 is held in a state where a valve seat 94 formed of hard rubber, aluminum metal or the like is laid and seated thereon so that a load can be received at the center of the umbrella portion of the valve head 74.

  Next, as shown in FIG. 5, an operator (not shown) grips the valve assembly tool 10 so that the handle 36 is downward (in the direction of arrow A) and the guide body 16 is upward (in the direction of arrow B). In this state, the cotter 20, the retainer 82 and the outer spring (valve spring) 100 are inserted into the guide body 16 in this order from the opening 44. The cotter 20 is held by the second holding portion 62 by the upper end portion having the convex portion 80 being attracted by the magnet 66 provided in the holder 48.

  The retainer 82 is disposed so as to cover the outer peripheral side of the cotter 20, and is held in a state where the collar portion 84 is in contact with the first holding portion 60. Further, the outer spring 100 is in a state in which its upper end is brought into contact with the flange portion 84 of the retainer 82.

  Next, while the outer spring 100 is held (supporting the outer spring 100 with fingers), the guide body 16 is turned down and the handle 36 is turned up so that the outer spring 100 is turned up, as shown in FIG. The valve assembly tool 10 is disposed at a position where the spring 100 is inserted into the outer peripheral side of the valve stem 76 and the inner spring 98, and the setting of the valve assembly tool 10 to the work start position is completed.

  In this case, since the cotter 20 is attracted and held by the magnet 66, even if the support state is unstable, the cotter 20 is prevented from being displaced or dropped.

  Then, after the valve assembly tool 10 is set at the work start position in FIG. 4, the handle 36 is pushed down, and its downward movement (in the direction of arrow A) is restricted. By performing a series of operations for pulling up the retainer, the retainer 82 is attached and fixed to the valve stem 76 via the cotter 20 at a predetermined position.

  Next, the mounting process of the retainer 82 and the cotter 20 performed using the above-described valve assembly tool 10 will be described in detail.

  First, when the handle 36 is pushed down from the set state of the retainer 82 and the cotter 20 shown in FIG. 4, the holder 48 is pushed down by the elastic force of the first spring 26 and the second spring 52. 82 and the cotter 20 are pushed down in the axial direction (arrow A direction) along the outer periphery of the valve stem 76 as the inner spring 98 and the outer spring 100 contract (see FIG. 5).

  In the present embodiment, the elastic force of the first and second springs 26 and 52 is set so that the elastic force of the first spring 26 is larger than that of the second spring 52 (first spring 26> As the second spring 52) and the handle 36 are pushed down, the second spring 52 contracts more than the first spring 26. Therefore, in this state, the downward movement amount of the holder 48 is less than the push-down amount of the handle 36. Not very big.

  When the handle 36 is further pushed down and the guide portion 73 of the body 12 comes into contact with the holder 48 as shown in FIG. 6, thereafter, the handle 36 is pushed down (the amount of contraction of the second spring 52). The holder 48 also moves downward (in the direction of arrow A). In other words, the movement amount of the handle 36 and the movement amount of the holder 48 are the same.

  As shown in FIG. 7, when the lower end of the spindle 50 and the valve stem 76 come into contact with each other by further pressing down the handle 36, the further downward movement of the spindle 50 is restricted, but the upper end of the spindle 50 and the adjuster 28 are controlled. Since the first spring 26 contracts until the lower end of the holder abuts, the holder 48 is further pushed down by the body 12 and moves downward (in the direction of arrow A), and the retainer 82 and the cotter 20 are fitted in the annular groove 78 of the valve stem 76. Reach the matching position.

  However, at this time, when the handle 36 is pushed down, as shown in FIGS. 8A and 8B, a gap (overstroke distance) that does not allow the upper end of the spindle 50 and the lower end of the adjuster 28 to come into contact with each other is formed. 28, the handle 36 is further pushed down by this gap distance, reaching the position where the upper end of the spindle 50 and the lower end of the adjuster 28 come into contact with each other, and the downward movement of the handle 36 is restricted. As described above, the handle 36 cannot be pushed down (see FIGS. 9A and 9B).

  Accordingly, as shown in FIGS. 9A and 9B, the retainer 82 and the cotter 20 stop moving downward at a position where the position of the annular groove 78 exceeds the distance corresponding to the overstroke amount (overstroke distance). .

  After reaching the state shown in FIGS. 9A and 9B, when the pushing force of the handle 36 is weakened, the retainer 82 and the cotter 20 are moved upward along the valve stem 76 by the elastic force of the inner spring 98 and the outer spring 100. Pushed up (in the direction of arrow B).

  At this time, the cotter 20 is pushed up in a state where the outer periphery is fastened by the inner peripheral surface of the retainer 82, so that the position where the cotter 20 fits in the annular groove 78 of the valve stem 76 as shown in FIGS. 10A and 10B. When the movement is restricted in this manner, the inner surface of the retainer 82 is wedged into the inner peripheral surface, and the position of the retainer 82 with respect to the valve stem 76 is fixed.

  Therefore, even if the handle 36 is subsequently pulled up and the valve assembly tool 10 is removed, the retainer 82 is maintained in a fixed state, and the operation of attaching the cotter 20 to the valve stem 76 is completed.

  Then, as shown in FIG. 11, a bottomed cylindrical valve lifter 104 is mounted from above so as to cover the upper end portion of the valve stem 76, and a disc-shaped shim 102 for adjusting the mounting gap is disposed therebetween. Thus, the cotter 20 and the retainer 82 are assembled to the valve stem 76, and the valve 18 is assembled in which the outer spring 100 and the inner spring 98 are interposed between the retainer 82 and the spring holder 96.

  In the above description, the case where the spring provided on the outer peripheral side of the valve stem 76 is constituted by two of the inner spring 98 and the outer spring 100 has been described, but even when only one spring is provided, the valve is operated in the same operation procedure. The cotter 20 and the retainer 82 can be assembled by the assembling tool 10.

  In the above-described valve assembly tool 10, the case where the holder 48 includes the magnet 66 and the ring body 64 has been described. However, the assembly may be performed without providing the magnet 66 and the ring body 64.

  In such a case, for example, in the procedure described with reference to FIG. 5, care must be taken so that the support state of the cotter 20 does not become unstable in the set state.

  Next, the valve assembly described above is applied to another valve in which the position of the annular groove 78 in the valve stem 76 and the shape of the cotter 20 assembled to the valve stem 76 are different due to the displacement of the engine (internal combustion engine) being different. The position adjustment of the adjuster 28 in the axial direction (arrow A, B direction) performed when the assembly is performed using the tool 10 will be described.

  This adjustment is performed by adjusting the above-described overstroke distance by operating the adjuster 28. The overstroke distance L3 is a dimension along the axial direction (arrow A, B direction) of the cotter 20, as shown in FIG. The total L3 of L1 and the distance L2 from the annular groove 78 of the valve 18 to the upper end of the valve stem 76 is set as a guide. (L3 ≒ L1 + L2)

  As a work procedure, an operator (not shown) first attaches the valve assembly tool 10 to the valve 18 in the attached state before the retainer 82 and the cotter 20 are removed, and pushes down the handle 36 to remove the spindle 50. The position where the contact of the adjuster 28 and the contact of the holder 48 and the retainer 82 are almost simultaneous is confirmed. This confirmation can be determined by the reaction force (feeling of contact) when the valve assembly tool 10 is pushed down.

  For this purpose, before the handle 36 is pushed down, the adjuster 28 is rotated clockwise (in the direction of the arrow C1 in FIG. 2), and the lower end of the adjuster 28 is moved a little downwardly to the extra eye to adjust the spindle 50 and the adjuster. 28, that is, a position where movement of the handle 36 downward (in the direction of arrow A) is restricted is adjusted. In this state, the adjuster 28 is rotated counterclockwise (in the direction of arrow C2 in FIG. 2) little by little to move the adjuster 28 upward (in the direction of arrow B), and the holder 48 is moved to the retainer 48 repeatedly while pushing down the handle 36. Adjuster 28 is adjusted until it reaches a position where it feels abutting 82.

  Then, by rotating the adjuster 28 counterclockwise (in the direction of arrow C2 in FIG. 2) so that the lower end of the adjuster 28 is further moved upward by the overstroke amount from the adjustment position described above, the adjustment work is performed. finish.

  In the present embodiment, since one rotation of the adjuster 28 is set to a stroke of 1 mm along the axial direction, for example, when the overstroke distance L3 is 6.5 mm, the adjuster 28 is moved counterclockwise. The adjustment work is completed by 6.5 rotations.

  However, the setting of the above-described overstroke amount (overstroke distance) does not necessarily have to be performed accurately. For example, the overstroke amount is too large and the lower end of the retainer 82 is in contact with the stem seal 92. A predetermined mounting effect of the retainer 82 can be obtained if a size that does not reach the upper limit or a size that can sufficiently overcome the annular groove 78 can be secured.

  Further, a reference position for rotating the adjuster 28 and a scale 42 as a guide for the amount of advancement / retraction from the reference position are provided on the upper end side of the adjuster 28 so that the advance / retreat position of the lower end of the adjuster 28 can be understood. (See FIG. 2) From the above-mentioned L3≈L1 + L2, the position of the adjuster 28 corresponding to the overstroke amount can also be adjusted by the above rotation operation based on the drawing dimensions of the valve 18.

  That is, even when the retainer 82 is assembled to another valve in which the position of the annular groove 78 in the valve stem 76 and the shape of the cotter 20 assembled to the valve stem 76 are different due to different engine displacements, etc. The assembly tool 10 can easily cope with this. In other words, it is not necessary to prepare a valve assembly tool for each different model, and the management of the tool is easy.

  On the other hand, when removing the cotter 20 and the retainer 82 assembled to the valve 18 as described above, the holder 48 described above is not provided with the ring body 64 made of an elastic material such as rubber as shown in FIG. In the same manner as when assembling, the handle 36 is moved until the lower end of the adjuster 28 comes into contact with the first small-diameter portion 70 of the spindle 50. The cotter 20 separated from the annular groove 78 is attracted to the magnet 154 by a series of operations for reducing the pressing force after the pressing. Then, by pulling up the handle 36 in this state, after the cotter 20 is taken out, the remaining retainer 82 and the like are taken out, and the removal work is completed. In this way, the holder 48 of the valve assembly tool 10 is replaced with another holder 150 for removal to increase the attracting force by the magnet 154, or to remove the elastic force interposed between the magnet 154 and the magnet 154. Thus, the cotter 20 and the retainer 82 assembled to the valve 18 can be easily removed.

  Of course, the cotter 20 and the retainer 82 assembled to the valve 18 may be removed by other tools or methods without using the above-described removal holder 150.

  As described above, in the present embodiment, in the valve assembly tool 10 for assembling the cotter 20 and the retainer 82 to the valve stem 76 of the valve 18, the holder 48 holding the cotter 20 and the retainer 82 is used as a guide body. When the cotter 20 held by the holder 48 is lowered by the operator pressing down the handle 36, the convex portion 80 of the cotter 20 causes the annular groove 78 of the valve stem 76 to be a predetermined amount. When it moves to a position beyond (downward), the lowering of the cotter 20 is controlled using the elastic force of the outer spring 100 and the inner spring 98 by restricting further lowering and weakening the pressing force of the valve assembly tool 10. It is possible to raise and engage the convex portion 80 with the annular groove 78 for assembly. In other words, the holder 48 holding the cotter 20 downward by a predetermined amount after the lower end portion (second small diameter portion 72) of the spindle 50 abuts on the upper end portion of the valve stem 76 is used to make the outer spring 100 and the inner spring 98 elastic. It can be moved toward the valve 18 against the force.

  As a result, the cotter 20 can be securely fitted and assembled in the gap between the valve stem 76 and the central hole 82a of the retainer 82 by a simple operation of pushing down the handle 36, and the valve stem 76 can be assembled via the cotter 20. The retainer 82 can be securely attached and fixed at the predetermined position.

  Further, in the holder mechanism 22 capable of holding the cotter 20 and the retainer 82, the cotter 20 made of a steel material can be attracted and held to the holder 48 by mounting the magnet 66 inside the holder 48. It becomes. As a result, in the valve assembly tool 10, when the holder 48 holding the cotter 20 and the retainer 82 is set downward on the valve stem 76, even if the support state of the cotter 20 is unstable, The dropout can be prevented, and the assembly work of the cotter 20 and the like can be performed efficiently.

  Further, the adjuster 28 is provided so as to face the upper portion of the handle 36, and the adjuster 28 is inserted into the groove 38 provided at the upper end of the adjuster 28 and rotated to rotate the adjuster 28 in the vertical direction (arrows A and B). For example, even when assembling the valve 18 of a model in which the position of the annular groove 78 and the shape of the retainer 82 are different, the adjuster 28 can be easily accommodated. Can do.

  Further, by providing the ring body 64 made of an elastic material so as to be adjacent to the magnet 66, when the cotter 20 is engaged with the annular groove 78 of the valve stem 76, when the holder 48 is pulled upward, the ring 48 is The cotter 20 is prevented from being attracted to the magnet 66 and pulled up together with the holder 48 by the intervention of the elastic member formed of the body 64. That is, when the holder 48 is lifted upward, if the pulling speed is high, it can be assumed that the cotter 20 is pulled up while being attracted to the holder 48 before being securely fitted into the annular groove 78. As described above, the ring body 64 prevents the annular groove 78 from separating.

  In addition, the valve assembly tool according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Valve assembly tool 12 ... Body 14 ... Cap 16 ... Guide body 18 ... Valve 20 ... Cotter 22 ... Holder mechanism 26 ... First spring 28 ... Adjuster 36 ... Handle 38 ... Groove 40 ... Adjustment tool 42 ... Scale 48 150 ... Holder 50 ... Spindle 52 ... Second spring 54 ... Holder body 56 ... Projection 64 ... Ring body 66 ... Magnet 76 ... Valve stem 78 ... Ring groove 80 ... Convex portion 82 ... Retainer 82a ... Center hole

Claims (6)

A valve assembly tool for assembling a plurality of cotters in a gap formed by a central hole of a retainer for locking a valve stem and a valve spring of an intake or exhaust valve provided in an internal combustion engine,
A tool body having a lower end opened and a handle for gripping provided on the upper end;
A spindle provided in the tool body so as to be vertically displaceable via a spring and capable of contacting the valve stem;
A holder provided in the tool body so as to be relatively displaceable in the vertical direction with respect to the spindle with respect to the spindle, and capable of contacting the cotter and the retainer;
With
When the handle is pushed down, the holder causes the cotter and retainer to move between the lower end of the spindle and the valve stem until the upper end of the spindle comes into contact with the tool body. A valve assembly tool characterized by being moved toward the valve against the force. In the valve assembly tool according to claim 1,
The handle is attached to the tool main body via a hollow cylinder, and the hollow cylinder includes an adjustment mechanism capable of adjusting a distance of a predetermined amount of movement of the spindle from the upper surface of the handle. Valve assembly tool. In the valve assembly tool according to claim 2,
The valve assembly tool according to claim 1, wherein the adjustment mechanism includes an adjuster that moves toward and away from the spindle by adjusting a rotation amount from an upper surface of the handle. In the valve assembly tool according to any one of claims 1 to 3,
The valve assembly tool, wherein the holder is provided with a magnet at an end on the valve side. In the valve assembly tool according to claim 4,
A tool for assembling a valve, wherein the holder is provided with a non-magnetic elastic body between an end on the valve side and the magnet. In the valve assembly tool according to any one of claims 1 to 5,
The valve assembly tool according to claim 1, wherein the holder includes a holding portion that regulates a posture of the retainer when the retainer is moved.

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