JP5417617B2 - Valve stem seal assembly tool - Google Patents

Description

  The present invention relates to an assembly tool for assembling a valve stem seal to a valve guide of an engine.

  An intake / exhaust valve of an engine is supported by a valve stem that passes through a cylindrical valve guide fixed to a cylinder head so as to be movable in an axial direction. The valve guide and the valve stem are sealed by a valve stem seal to prevent the engine oil from flowing from the oil chamber side into the combustion chamber side in the cylinder head.

  In a general engine manufacturing process, the valve stem seal is press-fitted and fixed to the tip of the valve guide. As an apparatus for assembling a valve stem seal, a production equipment apparatus has been developed in which a plurality of valve stem seals are collectively attached to a valve guide. For example, in Patent Document 1, the valve stem seal is held in the seal holder, and the valve stem seal is press-fitted by moving the seat holder vertically with respect to the valve guide by an assembly cylinder (elevating actuator) that extends and contracts. Are disclosed.

  There are also tools for manually assembling the valve stem seal. For example, Patent Document 2 discloses a tool in which a contact member is fixed to a rod portion having an outer diameter that can be inserted into a valve stem. In this technique, the rod portion is inserted into the valve stem in a state where the contact member is in contact with the upper surface of the valve stem seal, and the valve stem seal is press-fitted into the valve stem by applying an impact with a hammer.

Japanese Patent Laid-Open No. 7-266162 (paragraphs 0010 to 0012, FIG. 10) Japanese Patent Laid-Open No. 9-262779 (paragraphs 0019 to 0020, FIG. 9)

  By the way, valve stem seals are prepared in a wide variety to correspond to the types of valve stems and valve guides to be assembled, and the press-fitting dimensions (for example, driving heights) of the respective valve stem seals are individually managed. Since the press-fitting dimension of the valve stem seal has a great influence on the seal performance, extremely high accuracy and precision are required for its assembly accuracy.

  However, in the prior art as described above, the difference in the press-fit dimensions according to the type of the valve stem seal is not taken into consideration. For example, the production equipment described in Patent Document 1 can only assemble the valve stem seal with a fixed press-fit dimension, and the operator of the production equipment changes the amount of movement of the assembly cylinder when it is desired to change the press-fit dimension. Need arises.

  In this regard, in the technique described in Patent Document 2, an operator who uses a tool can individually adjust the press-fitting dimensions. However, the assembly accuracy in this case depends on the skill of the operator, and it is difficult to improve accuracy and precision.

  Further, valve stem seals assembled to the engine include not only those with different press-fitting dimensions but also those with different inner diameters and outer diameters. That is, a valve stem seal having a large outer diameter is used for an engine having a large valve guide, and a valve stem seal having a large inner diameter is used for an engine having a large valve stem.

  On the other hand, in the above-described prior art, such a difference in shape according to the type of the valve stem seal is not taken into consideration. Therefore, for example, in the production equipment described in Patent Document 1, it is necessary to prepare a different seal holder for each type of valve stem seal to be assembled, and the merit in production efficiency may be reduced. In addition, the tool described in Patent Document 2 must also be prepared for each type of valve stem seal, and there is a concern that production management will become complicated due to an increase in the number of tools, and product defects will occur due to the use of incorrect tools. Is done.

One of the objects of the present case has been invented in view of the above problems, and is to cope with a plurality of valve stem seals having different shapes and to improve the accuracy and precision of assembly accuracy.
The present invention is not limited to this purpose, and is a function and effect derived from each configuration shown in the embodiments for carrying out the invention described later, and other effects of the present invention are to obtain a function and effect that cannot be obtained by conventional techniques. Can be positioned.

(1) A valve stem seal assembling tool disclosed herein is an assembling tool for assembling a valve stem seal to a valve guide of an engine, and includes an internal part having a support portion for supporting the valve stem seal, and the internal part An outer pipe having a cylindrical hollow shaft portion inserted therein, and an abutment surface (for example, a front end surface of the outer pipe) that is provided on one end side of the hollow shaft portion and abuts against the engine when assembled. A variable positioning member (for example, a lock nut) that positions the inner part relative to the outer pipe in a changeable manner according to the distance between the valve stem seal supported by the inner part and the contact surface; Prepare.
The distance here means a predetermined distance or a desired distance that is defined in advance prior to positioning, for example, a dimension corresponding to a driving height for managing the assembly accuracy of the valve stem seal. .

  (2) Further, the outer pipe has a measurement surface (for example, a base end surface of the outer pipe) formed in parallel to the contact surface on the other end side of the hollow shaft portion, and the support portion is The inner part has a shaft-shaped shaft body portion provided with the support portion on one end side, and the other end side of the shaft body portion has a recess portion that engages with the outside of the valve stem seal. Has a stepped measurement step surface, and the length between the contact surface and the measurement surface of the outer pipe is the same as the length between the inner end of the indented portion of the inner part and the measurement cross section. It is preferable that

(3) The inner part has a sleeve screwed to the outer periphery of the shaft body, the outer pipe is screwed to the outside of the sleeve, and the variable positioning member is the outer It is preferable that the pipe body is made of an annular member screwed to the outer periphery of the shaft body portion so as to be able to come into contact with the measurement surface of the pipe.
(4) Further, the internal part is thinner than the shaft body portion, and has a knob portion provided to extend from an end portion on the other end side of the shaft body portion in the axial direction of the shaft body portion, It is preferable that the measurement cross section is provided between the shaft body portion and the knob portion so as to be perpendicular to the axis of the shaft body portion.

(5) Moreover, it is preferable that the pitch of the screw of the shaft body portion and the screw of the sleeve is the same.
(6) Moreover, it is preferable that the said pitch is 1 millimeter.
(7) Moreover, it is preferable that the external shape of the said variable positioning member is formed smaller than the said measurement surface of the said outer pipe.
(8) Moreover, it is preferable that the said support part of the said internal part has a diameter variable structure which deform | transforms according to the outer diameter of the said valve stem seal.

  (9) In addition, the support portion is arranged so as to spread in a conical surface at a predetermined interval on the outer periphery of the valve stem seal, and a plurality of gripping pieces (for example, gripping the valve stem seal from the outside) The sleeve is provided movably in the generatrix direction of the plurality of gripping pieces arranged in a conical surface, and the gripping pieces are close to each other according to the position in the busbar direction. It is preferable to include a second variable positioning member (for example, a small lock nut) that has a pressing end portion (for example, a surface portion) that presses in the direction to be moved and that positions the sleeve with respect to the shaft body portion in a changeable manner.

(10) Further, it is preferable that the second variable positioning member is an annular member screwed to the outer periphery of the shaft body portion so as to be able to contact the other end portion of the sleeve.
(11) Further, the support portion is a window portion opened to visually check the valve stem seal supported by the support portion, and a position adjacent to the window portion, the shoulder of the valve stem seal. It is preferable to have a reference line (for example, a groove or a ridge) provided at a position corresponding to the portion.

(12) Also, a cylindrical shaft that includes a shaft-shaped guide pin having an outer diameter corresponding to the inner diameter of the valve guide, and in which the inner part coincides with the center line of the valve stem seal supported by the support portion It is preferable that the guide pin has a hollow portion (for example, an inner cylindrical surface of an internal part) into which the guide pin is inserted.
(13) It is preferable that a cap for holding the one end of the guide pin detachably and fixing the guide pin inserted into the hollow portion to the internal part is preferably provided.

  According to the disclosed valve stem seal assembly tool, it is possible to cope with valve stem seals with different press-fitting heights by changing the fixing position of the internal parts with respect to the outer pipe, and the assembly accuracy of the valve stem seal to the valve guide is improved. Accuracy and precision can be improved. Further, it is not necessary to prepare a different tool for each press-fitting height, and the workability of assembling the valve stem seal can be improved.

It is sectional drawing of the valve stem seal | sticker press-fixed by the valve stem seal assembly | attachment tool which concerns on one Embodiment. It is a disassembled perspective view which shows the whole structure of a valve stem seal assembly tool. It is a figure for demonstrating the structure of the internal part of the assembly tool of FIG. 2, (a) is a front side view of a chuck | zipper, (b) is sectional drawing of a chuck | zipper, (c) is a principal part expanded sectional view of a chuck | zipper, (D) is an enlarged perspective view of the main part of the chuck, (e) is a front side view of the sleeve, (f) is a sectional view of the sleeve, (g) is a front side view of the small lock nut, and (h) is a small lock nut. FIG. It is a figure for demonstrating the structure of the external part of the assembly tool of FIG. 2, (a) is a side front view of an outer pipe, (b) is sectional drawing of an outer pipe, (c) is a front side view of a lock nut. (D) is sectional drawing of a lock nut. It is a figure for demonstrating the structure of the core part of the assembly tool of FIG. 2, (a) is a side view of a guide pin, (b) is a side front view of a cap, (c) is sectional drawing of a cap. It is a figure explaining the assembly procedure of the assembly tool of FIG. 2, (a) is a side view which shows the assembly state of an internal part, (b) is a sectional side view after the assembly. It is a figure explaining the assembly procedure of the assembly | attachment tool of FIG. 2, (a) is a side view which shows the assembly state of an internal part and an outer pipe, (b) is a sectional side view which shows the adjustment state of the driving height, (C) is a side view showing an assembled state of the internal part and the external part, (d) is a side sectional view showing a confirmation state of the driving height, and (e) is an assembled state of the internal part, the external part and the core part. FIG. It is a figure explaining the adjustment method of the driving height of the assembly tool of FIG. It is sectional drawing for demonstrating the assembly | attachment operation | work by the assembly tool of FIG. 2, (a) shows the state before press-fitting, (b) shows the state at the time of press-fitting, (c) shows the state after press-fitting, respectively. . It is a sectional side view which shows the whole structure of the valve stem seal assembling tool as a modification, (a) is a modification of the adjustment mechanism for driving dimensions, (b) is a modification of the adjustment mechanism for the outer diameter of the valve stem seal. Show.

  The valve stem seal assembly tool will be described with reference to the drawings. Note that the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the following embodiment.

[1. Overview of valve stem seal]
FIG. 1 shows a cross section of the valve stem seal 90 attached to the engine 80 using the valve stem seal assembling tool and its assembling location. A hollow cylindrical valve guide 82 is fixed to the cylinder head 81 of the engine 80. The valve guide 82 is provided to protrude toward the oil chamber 84 above the cylinder head 81. An annular valve spring seat 85 is provided on the lower surface side of the oil chamber 84 (downward in FIG. 1) so as to surround the valve guide 82. The valve spring seat 85 is a washer for securing the seating surface of the valve spring 86.

  A valve stem 83 of an intake / exhaust valve is inserted into the inner cylindrical surface 82 b of the valve guide 82. FIG. 1 shows a state after the valve stem 83 and the valve stem seal 90 are assembled, but the order of assembling them is arbitrary. For example, a procedure for inserting the valve stem 83 into the valve guide 82 before the assembly of the valve stem seal 90 may be employed, or a procedure for inserting the valve stem 83 into the valve guide 82 after the assembly of the valve stem seal 90 may be employed. This valve stem seal assembly tool can handle any procedure.

  The valve stem seal 90 is a sealing member provided between the valve guide 82 and the valve stem 83, and is press-fitted and fixed to the distal end portion of the valve guide 82. The valve stem seal 90 includes a cap-shaped reinforcing sleeve 91 and a seal rubber 92.

  The reinforcing sleeve 91 is made of metal and has a cylindrical portion 91a having an inner diameter larger than the outer diameter in the vicinity of the distal end portion of the valve guide 82, and a section including the cylindrical axis of the cylindrical portion 91a from one end in the cylindrical axis direction toward the cylindrical axis. And a shoulder portion 91b having an elongated shape. The shoulder portion 91b forms a donut-shaped plane perpendicular to the tube axis of the tube portion 91a. When viewed from the direction of the tube axis of the tube portion 91a, the shape formed by the inner tip of the shoulder portion 91b is a concentric circle smaller than the inner diameter of the tube portion 91a. The valve stem seal 90 is assembled so that the cylinder axis of the reinforcing sleeve 91 and the cylinder axis of the valve guide 82 coincide.

  The seal rubber 92 has a seal base portion 92a bonded to the inner peripheral surface of the cylindrical portion 91a, and a seal lip portion 92b protruding from the tip of the shoulder portion 91b to the outside of the reinforcing sleeve 91. The seal base 92 a is a portion that is press-fitted into and contacted with the outer periphery of the valve guide 82, and the seal lip portion 92 b is a portion that is in contact with the outer periphery of the valve stem 83. An annular coil spring 93 is mounted on the outer periphery of the seal lip portion 92b. Thereby, the close contact state of the seal lip 92b with respect to the valve stem 83 is maintained.

Hereinafter, the plane P1 including the upper surface of the shoulder portion 91b of the valve stem seal 90 and the plane P2 including the upper surface of the valve spring seat 85 are used as reference surfaces for assembling accuracy management of the valve stem seal 90. Further, the distance from the plane P1 to the plane P2 is referred to as a driving height H. The actual driving height H is an object of construction quality control, and is set to various sizes according to the position and outer diameter of the valve guide 82, the type of valve stem 83, the outer diameter, the type of engine 80, and the like. The
Not only the driving height H but also the outer shape of the valve stem seal 90 such as the inner diameter and outer diameter of the cylinder portion 91a and the length in the cylinder axis direction, the position and outer diameter of the valve guide 82, the type of the valve stem 83, Various settings are made according to the outer diameter, the type of engine 80, and the like.

As shown in FIG. 1, the lower end surface 91 c of the cylindrical portion 91 a of the reinforcing sleeve 91 is not in contact with the upper surface 81 a of the cylinder head 81 facing this. In addition, a slight gap is formed between the upper end surface 82a of the valve guide 82 and the lower end surface 92c of the seal lip 92b. Therefore, if the valve stem seal 90 is pressed into the valve guide 82, the upper end surface 82a of the valve guide 82 and the lower end surface 92c of the seal lip portion 92b come into contact with each other, and an accurate driving height H is secured. It ’s difficult.
This valve stem seal assembling tool is suitable for use in assembling such a valve stem seal 90, and is a tool having a mechanical structure capable of accommodating the valve stem seal 90 of various shapes and dimensions. is there.

[2. Installer features]
The installer 10 (valve stem seal assembling tool) of this embodiment is composed of three types of parts groups, and includes an internal part 10a, an external part 10b, and a core part 10c as shown in FIG.

When attention is paid to the function of the installer 10, the internal part 10a is a part that grips and supports the valve stem seal 90, and is compatible with valve stem seals 90 of various outer diameters. Further, the external part 10b has a height adjusting function for determining the driving height H of the valve stem seal 90, and can cope with various management dimensions of the driving height H. Further, the core part 10c has a positioning function for determining a driving position of the valve stem seal 90 (a position in a plane perpendicular to the cylinder axis of the valve guide 82), and can cope with various outer diameters of the valve stem 83.
Hereinafter, the description will be given in order focusing on the internal structure of the installer 10.

[3. Installer structure]
[3-1. Chuck]
The internal part 10 a includes three parts: a chuck 1, a sleeve 2, and a small lock nut 3.
As shown in FIG. 3B, the chuck 1 is a hollow shaft-like member, and includes a support portion 1a, a shaft body portion 1b, and a knob portion 1c. These three types of parts are integrally formed. The central axes of the hollow inner cylindrical surface 17 (hollow portion) provided inside each of the support portion 1a, the shaft body portion 1b, and the knob portion 1c coincide with each other. Hereinafter, the central axis of the chuck 1 is referred to as a cylinder axis C. In addition, regarding the sleeve 2, the small lock nut 3, the external part 10b, and the core part 10c that are attached to the chuck 1, the center axis that coincides with the cylinder axis C of the chuck 1 after assembly of the installer 10 is described. This is simply referred to as the cylinder axis C.

The support part 1a is a part that grips and supports the valve stem seal 90 before assembly. The support portion 1a has a variable diameter structure that supports the valve stem seal 90 having different outer diameters by being deformed according to the outer diameter of the valve stem seal 90.
As shown in FIG. 3A, the support portion 1a has a shape in which the outer diameter on the end surface 12 side is larger than the outer diameter on the joint portion side with the shaft body portion 1b. For example, the outer peripheral surface 15 of the support portion 1a has a rotating body shape around the cylinder axis C, and is formed in a trumpet shape in which two cylindrical surfaces having different outer diameters are connected by a cylindrical surface of a truncated cone. The support part 1a should just be the shape expanded diameter at least toward the end surface 12 side. Hereinafter, as shown in FIG. 3B, an inclined portion having a contour that is enlarged toward the end surface 12 in a cross section passing through the cylinder axis C is referred to as an enlarged diameter portion 15 a.

  Moreover, as shown to Fig.3 (a), the circular cut hole 11 penetrated to the inside from the outer peripheral surface 15 is drilled in the junction part side with the shaft body part 1b of the support part 1a. The number of the cut holes 11 is three, for example, and the arrangement of the center points of the respective cut holes 11 is equally spaced in the circumferential direction of the support portion 1a. Further, a slit groove 13 extending from the center of each cut hole 11 toward the end surface 12 of the support portion 1a is provided (that is, the support portion 1a is subjected to slot processing), and the tip of the support portion 1a has three ends. Divided into two parts (gripping pieces). By the slotting process, elastic deformation of the support portion 1a in the vicinity of the circular cut hole 11 is allowed. In addition, as the circular cut hole 11 is larger, the three portions at the tip of the support portion 1a are more easily deformed.

  As shown in FIG.3 (b), the 1st inner cylinder surface 17a is provided inside the support part 1a. The first inner cylinder surface 17a has a larger diameter than an outer diameter of a guide pin 6 described later and a second inner cylinder surface 17b of the shaft body portion 1b. In addition, the thickness of the support part 1a becomes thin, so that the 1st inner cylinder surface 17a is large, and the front-end | tip of the support part 1a becomes easy to deform | transform.

  A dent portion 14 in which the inner diameter of the first inner cylindrical surface 17a is further enlarged is provided at the outermost end portion on the end surface 12 side. The indented portion 14 is a portion that grips the reinforcing sleeve 91 of the valve stem seal 90 from the outside, and a cylindrical receiving surface 14 a that contacts the cylindrical portion 91 a of the reinforcing sleeve 91 and a shoulder receiving surface that contacts the shoulder portion 91 b of the reinforcing sleeve 91. 14b. The tube receiving surface 14 a is formed as a cylindrical surface with the tube axis C as the center, and the shoulder receiving surface 14 b is formed in a flat shape perpendicular to the tube axis C.

  Due to the elastic deformation of the support portion 1a described above, the tube receiving surface 14a of the recessed portion 14 is movable in a direction perpendicular to the tube axis C. Therefore, the diameter of the inscribed circle that contacts the three tube receiving surfaces 14a is variable. That is, the recess 14 is deformed in accordance with the outer diameter of the valve stem seal 90 and supports the valve stem seal 90 having different outer diameters.

  As shown in FIG. 3C, a groove 15b (reference line) is formed on the outer peripheral surface 15 to indicate a position that intersects with a plane including the shoulder receiving surface 14b. The groove 15b serves as an index indicating the position of the upper surface of the shoulder portion 91b of the valve stem seal 90 when the valve stem seal 90 is set in the recess 14. An indicator such as a ridge or a dot-like mark may be provided instead of the groove 15b. Further, the portion where the tube receiving surface 14a and the shoulder receiving surface 14b are adjacent to each other (entering corner portion) is subjected to a thinning process. Thereby, the perpendicularity of the tube receiving surface 14a and the shoulder receiving surface 14b is improved.

  The shaft body portion 1b is a portion formed in a hollow shaft shape, and as shown in FIG. 3A, the outer peripheral surface 16 is formed with a screw surface 16a having a screw groove. The outer diameter of the screw surface 16a of the shaft body portion 1b is the same as the outer diameter of the outer peripheral surface 15 at the joint portion of the support portion 1a, the number of screws is, for example, one and the pitch is, for example, 1 mm.

  As shown in FIG. 3B, a cylindrical second inner cylindrical surface 17b is provided inside the shaft body portion 1b. The inner diameter of the second inner cylindrical surface 17b is a size corresponding to the outer diameter of the guide pin 6 (that is, a size that allows surface contact with the guide pin 6 and can be inserted and removed), and the knob portion 1c from the shaft body portion 1b. Are formed with the same diameter.

  The knob portion 1c is a portion provided extending from the end of the shaft body portion 1b in the direction of the cylinder axis C. As shown in FIG. 3 (a), the knob portion 1c cuts a shaft-shaped member thinner than the shaft body portion 1b along two planes arranged in parallel to the cylinder axis C at intervals smaller than the diameter of the member. It has a barrel-shaped cross section. In FIG. 3 (d), reference numerals 19a and 19b are assigned to two surfaces parallel to each other on the surface of the knob portion 1c, and reference numeral 19c is assigned to the remaining cylindrical surface. The second inner cylindrical surface 17b is provided so as to penetrate between the two surfaces 19a and 19b, and the distance between the two surfaces 19a and 19b is larger than the inner diameter of the second inner cylindrical surface 17b.

  Since the knob portion 1c is thinner than the shaft body portion 1b, as shown in FIG. 3D, the end surface of the shaft body portion 1b on the knob portion 1c side is partially visible. Hereinafter, a surface generated by a difference in cross-sectional shape between the shaft body portion 1b and the knob portion 1c is referred to as a measurement step surface 18. The measurement step surface 18 is provided as a plane perpendicular to the cylinder axis C of the shaft body portion 1b. Further, a screw surface 19d having a screw groove is provided at the tip of the cylindrical surface 19c of the knob portion 1c. The screw surface 19d is screwed into a female screw formed on the cap 7 described later.

  Here, the distance from the groove 15b provided on the outer peripheral surface 15 of the support portion 1a to the measurement step surface 18 is set to L. The distance from the groove 15b to the end surface 12 of the support portion 1a is set to M. The distance L is set to the same dimension as the overall length of the outer pipe 4 described later. Further, the distance M only needs to be long enough to hold the cylindrical portion 91a of the valve stem seal 90, and is set to a dimension that is at least smaller than the driving height H.

[3-2. sleeve]
The sleeve 2 is a cylindrical member that is attached to the outside of the chuck 1 and has a cylinder axis that coincides with the cylinder axis C of the chuck 1. The sleeve 2 has two functions. The first function is a function of fixing and maintaining the shape of the indented portion 14 where the valve stem seal 90 is gripped, that is, a function of determining the diameter of the inscribed circle that contacts the three tube receiving surfaces 14a. The second function is a function of screwing the chuck 1 into an outer pipe 4 described later.

  End surfaces 21 and 22 of the sleeve 2 are surfaces perpendicular to the cylinder axis C. As shown in FIG. 3 (f), a corner portion between one end surface 21 and the inner peripheral surface 24 is provided with a surface portion 21 a (pressing end portion) formed by chamfering, and a diameter-enlarged portion of the outer peripheral surface 15. Contactability with 15a is ensured. The other end surface 22 is a surface that contacts the small lock nut 3. In order to bring the surface portion 21a and the enlarged diameter portion 15a into surface contact, it is preferable that the inclination gradient of the surface portion 21a in the cross section passing through the cylinder axis C corresponds (matches) with the inclination gradient of the enlarged diameter portion 15a.

As shown in FIG. 3 (e), the outer peripheral surface 23 of the sleeve 2 is provided with a screw surface 23a in which a thread groove is formed and an anti-slip surface 23b in which knurling is performed. The outer diameter of the outer peripheral surface 23 is uniform from one end face 21 over the other end surface 22, its outer diameter is W _1. The screw surface 23a is a surface that is screwed into an outer pipe 4 described later, and the number of thread grooves is, for example, one thread, and the pitch is, for example, 1 mm.

  The inner peripheral surface 24 of the sleeve 2 is provided with a screw surface 24a on which a female screw is formed, and an inner cylinder surface 24b having an inner diameter larger than the screw surface 24a. The screw surface 24a is a portion that is screwed into the screw groove of the screw surface 16a of the shaft body portion 1b. The number of female threads is, for example, one and the pitch is, for example, 1 mm.

Width D ₁ of the cylindrical axis C of the threaded surface 24a is formed can be arbitrarily set. The larger the width dimension D _1, screwing area increases with the threaded surface 24a and threaded surface 16a, it becomes fastening is ensured. On the other hand, considering the workability during assembly of the chuck 1 of the sleeve 2, it requires less amount of rotation of the sleeve 2 the smaller width dimension D _1, is efficient. Therefore, it is preferable to set the width dimension D ₁ as small as possible within a range that does not hinder the fastening between the chuck 1 and the sleeve 2.

  The sleeve 2 is movable in the direction of the cylinder axis C in a state where the screw surface 24a is screwed with the screw surface 16a of the shaft body portion 1b. Further, at this time, when the surface portion 21a of the sleeve 2 abuts on the enlarged diameter portion 15a of the support portion 1a, the tube receiving surfaces 14a are pressed in a direction approaching each other. The diameter of the inscribed circle in contact with the three tube receiving surfaces 14a becomes smaller as the sleeve 2 is moved to the support portion 1a side. Thereby, the outer diameter of the valve stem seal 90 gripped by the recessed portion 14 of the chuck 1 is variable.

[3-3. Small lock nut]
The small lock nut 3 (second variable positioning member) is a nut member (annular member) for fixing the sleeve 2 to the chuck 1 at an arbitrary position. As shown in FIG. 3G, the outer peripheral surface 31 of the small lock nut 3 is provided with a non-slip surface 31a that is knurled. The outer diameter dimension W ₂ of the small lock nut 3 is set smaller than the outer diameter dimension W ₁ of the sleeve 2.

  Further, as shown in FIG. 3 (h), on the inner peripheral surface 32 of the small lock nut 3, a screw surface 32a of a female screw having the same diameter, the same number of threads, and the same pitch as the screw surface 24a is formed. The sleeve 2 and the small lock nut 3 function as a double nut on the thread surface 16 a of the chuck 1. These positions are fixed by bringing the end surface 22 of the sleeve 2 and the end surface 33 of the small lock nut into contact with each other and tightening each other, and the contact position between the surface portion 21a of the sleeve 2 and the enlarged diameter portion 15a of the support portion 1a is fixed. The Accordingly, the diameter of the inscribed circle that contacts the tube receiving surface 14a of the support portion 1a is also determined, and the valve stem seal 90 is held in a state of being supported by the support portion 1a of the chuck 1.

[3-4. Outer pipe]
The external part 10 b includes an outer pipe 4 and a lock nut 5.
The outer pipe 4 is a cylindrical member that is attached to the outside of the internal part 10 a to which the sleeve 2 is fixed, and has a cylindrical axis that coincides with the cylindrical axis C of the chuck 1. As shown in FIG. 4A, a distal end surface 41 (contact surface) and a proximal end surface 42 (measurement surface) perpendicular to the cylinder axis C are provided at both ends of the outer pipe 4 in the cylinder axis C direction.

  The front end surface 41 is a part that comes into contact with the upper surface of the valve spring seat 85 of the engine 80 when the valve stem seal 90 is assembled. Moreover, the base end surface 42 is a surface which contacts the lock nut 5 mentioned later. The distance between the distal end surface 41 and the proximal end surface 42 is formed to have the same dimension as the distance L from the groove 15b provided on the outer peripheral surface 15 of the support portion 1a to the measurement step surface 18.

The outer circumference of the outer pipe 4 on the base end face 42 side is provided with a large diameter portion 43 whose outer diameter is larger than that of the distal end face 41 side. The outer diameter of the large-diameter portion 43 is W _3. Thereby, the area of the base end surface 42 becomes wide and it becomes easy to measure a dimension. For example, the tip of a vernier caliper depth bar can be easily abutted against the base end face 42.

  Further, as shown in FIG. 4B, the inner peripheral surface 44 of the outer pipe 4 is provided with a screw surface 44a on which an internal thread is formed and an inner cylindrical surface 44b having an inner diameter larger than the screw surface 44a. It is done. The screw surface 44a is a part that is screwed into the screw groove of the screw surface 23a of the sleeve 2, and the number of female threads is, for example, one and the pitch is, for example, 1 mm. Therefore, the outer pipe 4 is movable in the direction of the cylinder axis C of the internal part 10a to which the sleeve 2 is fixed.

Width D ₂ of the cylindrical axis C of the threaded surface 44a is formed can be arbitrarily set. Similar to the width dimension D ₁ of the thread surface 24a of the sleeve 2, become as fastening is sure to increase the engagement area with the outer peripheral surface 23 of the thread surface 44a and the sleeve 2 the larger width dimension D _2, the width dimension As D ₂ is smaller, workability is improved.

[3-5. Lock nut]
The lock nut 5 (variable positioning member) is a nut member (annular member) for fixing the outer pipe 4 at an arbitrary position with respect to the internal part 10a to which the sleeve 2 is fixed. As shown in FIG. 4C, the outer peripheral surface 51 of the lock nut 5 is provided with a non-slip surface 51 a that is knurled in the same manner as the small lock nut 3. The outer diameter dimension W ₄ of the lock nut 5 is set smaller than the outer diameter dimension W ₃ of the large diameter portion 43 of the outer pipe 4.

  Further, as shown in FIG. 4D, a female thread surface 52 a that is screwed into the thread groove of the thread surface 16 a of the chuck 1 is formed on the inner peripheral surface 52 of the lock nut 5. The outer pipe 4 and the lock nut 5 function as a double nut on the outer peripheral surface 23 of the sleeve 2 and the outer peripheral surface 16 of the chuck 1. The inner part 10a is fixed to the outer part 10b by bringing the base end face 42 of the outer pipe 4 and the end face 53 of the lock nut 5 into contact with each other and tightening each other.

[3-6. guide pin]
The core part 10 c includes a guide pin 6 and a cap 7. The guide pin 6 is a member formed in a shaft shape having an outer diameter corresponding to the inner diameter of the valve guide 82 associated with the assembly, and is inserted into the chuck 1 so that its axial center coincides with the cylinder axis C of the chuck 1. The

As shown in FIG. 5A, the guide pin 6 includes a screw surface 61, a first cylindrical surface 62, and a second cylindrical surface 63 on the surface thereof. The screw surface 61 is a portion that is screwed into the female screw formed on the cap 7. The outer diameter of the screw groove of the screw surface 61 is smaller than the outer diameter of the screw surface 19 d formed on the cylindrical surface 19 c of the knob portion 1 c of the chuck 1.
The first cylindrical surface 62 is a portion that is in sliding contact with the second inner cylindrical surface 17b formed on the shaft body portion 1b and the knob portion 1c of the chuck 1, and the outer diameter thereof corresponds to the inner diameter of the second inner cylindrical surface 17b. Set to size.

On the other hand, the second cylindrical surface 63 is a portion for positioning the valve stem seal 90, and the maximum outer diameter is a size corresponding to the inner diameter of the valve guide 82 to which the valve stem seal 90 is attached (the valve guide 82 It is set to the same size as the outer diameter of the valve stem 83 to be inserted. The second cylindrical surface 63 is tapered so that the outer diameter is slightly smaller on the tip 64 side of the guide pin 6 so as to facilitate alignment when the valve stem seal 90 is assembled.
When there are a plurality of types of inner diameters of the valve guide 82 to which the valve stem seal 90 is assembled, a plurality of types of guide pins 6 having the second cylindrical surface 63 corresponding to the types of the inner diameters may be prepared.

[3-7. cap]
The cap 7 is a member for fixing the guide pin 6 to the chuck 1. The cap 7 is formed in a shape in which two types of hollow cylinders having the same outer diameter and different inner diameters are coaxially arranged adjacently and a hole on the top surface of the hollow cylinder on the small diameter side is closed. As shown in FIG. 5C, a first inner peripheral surface 71 and a second inner peripheral surface 72 are provided inside the cap 7. The first inner peripheral surface 71 is a surface on which a female screw that is screwed with the screw surface 61 of the guide pin 6 is formed.

  The inner diameter of the second inner peripheral surface 72 is larger than that of the first inner peripheral surface 71, and is a surface on which a female screw that is screwed with the screw surface 19d of the knob portion 1c is formed. By screwing the thread grooves corresponding to the female threads of the first inner peripheral surface 71 and the second inner peripheral surface 72, the guide pin 6 inserted into the inner cylindrical surface 17 of the chuck 1 is cap 7 against the chuck 1. It is fixed indirectly via.

  The knob 1c of the chuck 1 is inserted into a space sandwiched between the guide pin 6 attached to the first inner peripheral surface 71 and the second inner peripheral surface 72. Accordingly, the inner diameters of the first inner peripheral surface 71 and the second inner peripheral surface 72 are set so that a dimension corresponding to the thickness between the cylindrical surface 19c of the knob portion 1c and the second inner cylindrical surface 17b is secured. It is preferable.

  As shown in FIG. 5B, the end surface 74 of the cap 7 opposite to the side on which the first inner peripheral surface 71 is formed is a hammer striking surface when the valve stem seal 90 is assembled. Further, the outer peripheral surface 73 of the cap 7 is provided with a non-slip surface 73a that is knurled.

[4. Procedure for using assembly tool]
[4-1. Adjustment of outer diameter]
First, an operation for adjusting the gripping dimension of the chuck 1 to the outer diameter of the valve stem seal 90 is performed. As shown in FIG. 6A, the valve stem seal 90 is set on the support portion 1 a of the chuck 1. Here, it is confirmed whether or not the position of the shoulder portion 91 b of the valve stem seal 90 matches the groove 15 b of the outer peripheral surface 15.

Next, the knob 1 c side of the chuck 1 is inserted from the end surface 21 side of the sleeve 2, and the screw surface 24 a of the sleeve 2 is screwed into the screw surface 16 a of the chuck 1. The sleeve 2 is rotated until the diameter of the inscribed circle in contact with the three tube receiving surfaces 14 a approximately matches the outer diameter of the valve stem seal 90.
The surface portion 21a provided on the end surface 21 side of the sleeve 2 contacts the enlarged diameter portion 15a of the outer peripheral surface 15 of the chuck 1, and elastically deforms the support portion 1a so as to narrow the three tube receiving surfaces 14a inward. At this time, it is preferable to finely adjust the rotational position of the sleeve 2 so that the holding force is such that the valve stem seal 90 can be easily removed by hand, and to determine the holding force by the tube receiving surface 14a.

When the position of the sleeve 2 is determined, as shown in FIG. 6B, the knob 1 c side of the chuck 1 is inserted from the end surface 33 side of the small lock nut 3, and the small lock nut 3 is inserted into the screw surface 16 a of the chuck 1. Screw the screw surface 32a. Thereafter, the end surface 33 of the small lock nut 3 is brought into contact with the end surface 22 of the sleeve 2 and tightened to fix the positions of the sleeve 2 and the small lock nut 3 together.
Here, since the outer diameter of the valve stem seal 90 supported by the chuck 1 is fixed, the valve stem seal 90 is once removed from the support portion 1a of the chuck 1 and the external part 10b is subsequently assembled.

[4-2. Driving height adjustment and position setting]
As shown in FIGS. 7A and 7B, the knob part 1c side of the internal part 10a is inserted from the distal end surface 41 side of the outer pipe 4, and the outer pipe 23 The screw surface 44a of the inner peripheral surface 44 is screwed. The outer pipe 4 is rotated until at least the shaft body portion 1b of the internal part 10a protrudes from the base end face 42 side. Then, the distance X from the base end face 42 of the outer pipe 4 to the measurement step surface 18 of the chuck 1 is measured using a caliper, a digital caliper or the like.

  The overall length L of the outer pipe 4 matches the distance L from the groove 15b of the internal part 10a to the measurement step surface 18. That is, as shown in FIG. 7B, the distance X from the base end surface 42 to the measurement step surface 18 matches the distance from the distal end surface 41 of the outer pipe 4 to the groove 15b of the internal part 10a. In other words, the distance X coincides with the distance from the upper surface of the valve spring seat 85 with which the distal end surface 41 of the outer pipe 4 abuts to the shoulder portion 91b of the valve stem seal 90. Therefore, the outer pipe 4 may be rotated until the distance X reaches the same dimension as the driving height H.

  When the positional relationship between the inner part 10a and the outer pipe 4 is determined, the knob part 1c side of the inner part 10a is inserted from the end face 53 side of the lock nut 5 as shown in FIGS. The screw surface 52a of the lock nut 5 is screwed into the first screw surface 16a. Thereafter, the end face 53 of the lock nut 5 is brought into contact with the base end face 42 of the outer pipe 4 and tightened to fix the positions of the outer pipe 4 and the lock nut 5 together. At this stage, the driving height H of the valve stem seal 90 supported by the chuck 1 is fixed. After the lock nut 5 is fastened, it is reconfirmed that the distance X from the base end face 42 to the measurement step surface 18 is the same as the driving height H as shown in FIG.

  Thereafter, the core part 10c is assembled by screwing together the guide pin 6 and the cap 7 having a specified shaft diameter. As shown in FIG. 7 (e), the core part 10 c is inserted from the knob part 1 c side of the internal part 10 a, and the screw surface 19 d of the knob part 1 c is screwed into the second inner peripheral surface 72 of the cap 7. The first cylindrical surface 62 of the guide pin 6 is in sliding contact with the second inner cylindrical surface 17b of the chuck 1 and is disposed along the cylindrical axis C. With this procedure, the adjustment of the installer 10 is completed.

When the valve stem 83 is inserted into the valve guide 82 before the valve stem seal 90 is assembled, the guide pin 6 is not necessary and only the cap 7 is attached to the knob portion 1c.
The amount of movement in the direction of the cylinder axis C that occurs when the outer pipe 4 is rotated with respect to the internal part 10a depends on the number of strips and the pitch. For example, in the case of a single thread having a pitch of 1 mm, the rotational speed of the outer pipe 4 matches the moving distance in millimeters. The driving height H may be adjusted using such a relationship.

  That is, as shown in FIG. 8, the front end surface 41 of the outer pipe 4 and the groove 15 b of the chuck 1 are aligned (that is, the base end surface 42 of the outer pipe 4 and the measurement step surface 18 of the chuck 1 are flush with each other). In the state where the outer pipe 4 is positioned), marking is performed on both the large-diameter portion 43 of the outer pipe 4 and the cylindrical surface 19c of the knob portion 1c, and the relative rotation amount between the outer pipe 4 and the chuck 1 is grasped.

  For example, if the outer pipe 4 is rotated 15 times with respect to the chuck 1 with reference to the marking mark, the distance X from the base end face 42 to the measurement step surface 18 becomes 15 mm. Therefore, if the outer pipe 4 is rotated by the number of times corresponding to the driving height H, the driving height H can be set accurately. Even after such setting of the driving height H, it is preferable to carry out final confirmation of the dimensions as shown in FIG.

[4-3. Press fitting of valve stem seal]
Next, a procedure for press-fitting the valve stem seal 90 when the valve stem 83 is inserted into the valve guide 82 after the valve stem seal 90 is assembled will be described.

  Engine oil is applied to the cylindrical portion 91 a of the reinforcing sleeve 91 of the valve stem seal 90, and this is set on the support portion 1 a of the installer 10. As shown in FIG. 9 (a), the tip 64 of the guide pin 6 is brought into contact with the inner cylindrical surface 82b of the valve guide 82 to adjust the position, and when the installer 10 is slowly moved downward, the guide pin 6 is moved to the inside of the seal base 92a. The valve guide 82 is press-fitted. At this time, the end surface 74 of the cap 7 of the installer 10 may be press-fitted by hitting it with a plastic hammer or the like.

  The lower limit of the movement position of the installer 10 is a position where the front end surface 41 of the outer pipe 4 of the installer 10 comes into contact with the upper surface of the valve spring seat 85 as shown in FIG. In addition, it can grasp | ascertain that the front end surface 41 of the outer pipe 4 and the valve spring seat 85 contact | abutted by the change of the striking sound produced when the end surface 74 of the cap 7 of the installer 10 is struck with a plastic hammer etc. .

  At this time, the distance X from the distal end surface 41 of the outer pipe 4 to the shoulder portion 91b of the valve stem seal 90 has the same dimension as the preset driving height H. Therefore, when the installer 10 is slowly pulled up, a slight gap is formed between the upper end surface 82a of the valve guide 82 and the lower end surface 92c of the seal lip 92b, as shown in FIG. 9C. The valve stem seal 90 is driven into the tip of the valve guide 82 and fixed at a height H. A clearance between the upper end surface 82a of the valve guide 82 and the lower end surface 92c of the seal lip 92b is also secured.

[5. effect]
[5-1. Variable driving height]
As described above, the installer 10 manages the press-fitting dimensions with reference to the upper surface of the valve spring seat 85 with which the tip surface 41 of the outer pipe 4 abuts, so that the bottom surface of the valve guide 82 and the seal lip portion 92b are below. Even when there is a gap between the end surface 92c, the valve stem seal 90 can be assembled with an accurate driving height H.

  In the installer 10, the fixing position of the internal part 10a with respect to the external part 10b is variable. Therefore, the valve stem seal 90 having an arbitrary driving height H can be handled, and the assembly accuracy of the valve stem seal 90 to the valve guide 82 can be improved. Thereby, it is not necessary to prepare a different tool for each driving height H, and the assembly workability of the valve stem seal 90 can be improved. For example, the position of the internal part 10a relative to the external part 10b may be adjusted as appropriate according to the driving height H as a predetermined desired dimension (predetermined distance).

Further, the installer 10 has a structure in which the distance X from the base end surface 42 of the outer pipe 4 to the measurement step surface 18 matches the driving height H as shown in FIG. Thereby, the dimension of the inner side of the outer pipe 4 can be grasped by converting it into a projecting dimension from the outer pipe 4, and the confirmation work of the dimension becomes easy.
Particularly, since the measurement step surface 18 is provided between the shaft body portion 1 b and the knob portion 1 c in the internal part 10 a of the installer 10, the distance from the base end surface 42 of the outer pipe 4 to the measurement step surface 18. Can be measured accurately. Therefore, the construction accuracy related to the dimension adjustment can be improved.

Further, in the installer 10, a double nut structure is formed by abutting and tightening the lock nut 5 screwed to the screw surface 16a of the internal part 10a and the outer pipe 4 screwed to the screw surface 23a of the internal part 10a. Forming. Thereby, the relative position of the internal part 10a and the external part 10b can be arbitrarily set and fixed. Moreover, the double nut structure can be easily released, and the internal part 10a and the external part 10b can be easily moved. Therefore, the assembly workability of the valve stem seal 90 can be improved.
The adjustment dimension can be continuously changed by a screw-type dimension adjustment mechanism, and there is an advantage that fine adjustment is easy and it is possible to cope with an arbitrary dimension.

Further, in the installer 10, the thread surface 16a of the chuck 1 and the thread surface 23a of the sleeve 2 are formed at the same pitch with respect to the thread pitch of the internal part 10a according to the double nut structure. That is, the lock nut 5 screwed to the screw surface 16a and the outer pipe 4 screwed to the screw surface 23a have the same pitch, and the screw diameter of the screwed surface is different, but the cylinder axis C direction with respect to the rotation amount. The moving distance to is the same. Therefore, the movement amounts of the lock nut 5 and the outer pipe 4 generated when the internal part 10a is rotated can be made the same, and the fixing position can be easily adjusted at the time of fastening or releasing.
In addition, if the screwing surface of the internal part 10a and the external part 10b is formed with a single thread and all the screw pitches are 1 mm, the number of rotations of the internal part 10a and the moving distance in millimeters of the external part 10b are matched. be able to. Therefore, as shown in FIG. 8, the adjustment dimension can be easily grasped intuitively.

In the installer 10, the outer diameter dimension W ₄ of the lock nut 5 is set smaller than the outer diameter dimension W ₃ of the large-diameter portion 43 of the outer pipe 4. As a result, as shown in FIG. 7D, the tip of the vernier caliper depth bar can be brought into perpendicular contact with the base end face 42 even after being fastened by the lock nut 5, thereby improving the measurement accuracy of the dimensions. Can do.

[5-2. Variable stem valve seal outer diameter]
The support portion 1 a of the installer 10 is deformed according to the outer diameter of the valve stem seal 90. Therefore, the valve stem seal 90 having an arbitrary diameter can be handled, and the assembly accuracy of the valve stem seal 90 to the valve guide 82 can be improved. Thereby, for example, it is not necessary to prepare a different tool for each outer diameter of the valve stem seal 90, and the workability of assembling the valve stem seal 90 can be further improved.

  Further, the installer 10 includes a chuck structure in which the tip of the support portion 1a is divided into three parts, and a diameter-enlarged part 15a is provided on the outer peripheral surface 15 of each divided part. Therefore, the enlarged diameter portion 15a can be easily narrowed inward by pressing the enlarged diameter portion 15a in the cylinder axis C direction with the surface portion 21a on the end face 21 side of the sleeve 2. Therefore, by adjusting the positions of the sleeve 2 and the support portion 1a, the valve stem seals 90 having different diameters can be easily gripped, and workability can be improved.

In the installer 10, the double nut structure is formed by tightening the sleeve 2 and the small lock nut 3 that are screwed onto the thread surface 16 a of the chuck 1. Thereby, the relative position of the sleeve 2 and the support part 1a can be arbitrarily set and fixed. Moreover, the double nut structure can be easily released, and the sleeve 2 and the small lock nut 3 can be easily moved. Therefore, the assembly workability of the valve stem seal 90 can be improved.
In addition, the gripping dimension can be continuously changed by the screw-type support outer diameter adjustment structure, and there is an advantage that the holding force can be easily finely adjusted and that any outer diameter dimension can be accommodated. For example, the work inconvenience that the gripping force is too strong and the tool cannot be removed after the assembly can be solved.

  Further, in the installer 10, as shown in FIG. 6B, the shoulder portion 91 b of the valve stem seal 90 that can be seen from the slit groove 13 formed in the support portion 1 a of the chuck 1 is matched with the groove 15 b. It can be easily confirmed that the valve stem seal 90 is housed in the proper support position. Therefore, the assembly accuracy of the installer 10 can be improved.

[5-3. Variable valve guide inner diameter]
Moreover, in this installer 10, the guide pin 6 from which the outer diameter of the 2nd cylinder surface 63 differs can be used. That is, since the core part 10c is detachable from the internal part 10a, the guide pins 6 having different outer diameters can be inserted into the inner cylindrical surface 17 of the internal part 10a, and correspond to the valve guides 82 having different inner diameters. be able to. Thereby, the assembly accuracy of the valve stem seal 90 to the valve guide 82 can be improved. Further, for example, it is not necessary to prepare a different tool for each inner diameter of the valve guide 82, and the assembly workability of the valve stem seal 90 can be improved.

  Further, as shown in FIG. 9A, the guide pin 6 is inserted into the valve guide 82 even if the cylinder axis C immediately before the press fitting of the valve stem seal 90 does not coincide with the cylinder axis of the valve guide 82. As a result, the position of the valve stem seal 90 in the plane perpendicular to the cylinder axis of the valve guide 82 is finely adjusted and positioned accurately. Thus, by providing the guide pin 6 in the installer 10, the valve stem seal 90 can be accurately aligned, and the workability of assembling the valve stem seal 90 can be improved.

[6. Modifications etc.]
Regardless of the embodiment described above, various modifications can be made without departing from the spirit of the invention. Each structure of this embodiment can be selected as needed, or may be combined appropriately.

[6-1. When using a structure other than screws]
The installer 10 described above is exemplified by a screw type dimensional adjustment mechanism and a screw type support outer diameter adjustment mechanism, but the specific mechanism and structure as described above are arbitrary. Instead of the screw type dimensional adjustment mechanism, a mechanism that changes the relative positions of the internal part 10a and the external part 10b stepwise (discontinuously) may be used, or a bolt, a detachable rivet, or the like may be used. .

  For example, as shown in FIG. 10A, a pressing member 45 (one of variable positioning members) urged from the inner peripheral surface 44 of the outer pipe 4 toward the outer peripheral surface 23 of the sleeve 2 is provided. A plurality of recessed portions 25 (one of variable positioning members) to be engaged are provided on the outer peripheral surface 23 of the sleeve 2. The internal part 10a is slidable in the direction of the cylinder axis C with respect to the outer pipe 4, and is fixed at a position where the pressing member 45 and the recess 25 are engaged. Here, the same code | symbol is attached | subjected and shown to the element similar to the above-mentioned embodiment.

  Thus, if it is the structure which fixes the relative position of the internal part 10a and the external part 10b in a some position, there will exist an effect similar to the above-mentioned installer 10, and the lock nut 5 becomes unnecessary in addition. The driving height H is determined by the positional relationship between the internal part 10a and the external part 10b. If there are at least two fixed positions of the internal part 10a, it can be said that the driving height H is variable (in two positions). Therefore, it is sufficient if the internal part 10a is fixed at at least two positions.

  The same applies to the structure for fixing the relative position between the chuck 1 and the sleeve 2. For example, as shown in FIG. 10B, a second pressing member 26 (one of variable positioning members) urged from the inner peripheral surface 24 of the sleeve 2 toward the outer peripheral surface 16 of the chuck 1 is provided. A plurality of second recesses 16b (one of variable positioning members) that engage with the outer peripheral surface 16 of the chuck 1 may be provided. In this case as well, the same effect as the installer 10 described above can be obtained, and the small lock nut 3 can be omitted.

[6-2. Other variations]
In the installer 10 described above, the inner part 10a has a structure corresponding to the valve stem seal 90 having various outer diameters. For example, when the valve stem seal 90 has one type of outer diameter, the chuck 1 is slipped. Support outer diameter adjusting mechanisms such as the split groove 13 and the enlarged diameter portion 15a can be omitted.

  The slot 13 of the chuck 1 not only has a function of adjusting the diameter of the inscribed circle of the enlarged diameter portion 15a, but also visually confirms the position of the attached valve stem seal 90 as shown in FIG. It also has a function to check directly. Therefore, when the slit groove 13 is omitted, it is conceivable to provide a window portion opened at a position corresponding to the shoulder portion 91b of the valve stem seal 90. By matching the shoulder portion 91b of the valve stem seal 90 visible from the window portion with the groove 15b, it can be easily confirmed that the valve stem seal is housed in the proper support position.

Further, if the chuck 1 and the sleeve 2 are integrally formed, the screw surface of the outer peripheral surface 16 and the small lock nut 3 can be omitted. Further, when the valve guide 82 for assembling is of one type, the chuck 1, the guide pin 6 and the cap 7 may be integrally formed in advance.
In the installer 10 described above, the chuck 1 is provided with the recess 14 having the tube receiving surface 14a and the shoulder receiving surface 14b. However, the specific shape of the recess 14 is not limited thereto. What is necessary is just to have a shape that engages with the outside of the valve stem seal 90 at least. Therefore, the shape of the recess 14 is set according to the shape of the valve stem seal 90.

  The installer 10 described above is a tool used when the plane P1 including the upper surface of the shoulder portion 91b of the reinforcing sleeve 91 is set as a reference plane for managing the assembly accuracy of the valve stem seal 90. The position of is not limited to that described above. For example, when the upper end surface of the seal lip portion 92b of the valve stem seal 90 is used as the reference surface, the total length of the measurement step surface 18 of the chuck 1 and the outer pipe 4 is changed accordingly, and the above-described embodiment can be achieved. Similar procedures and effects can be obtained.

In the above-described embodiment, the entire length of the outer pipe 4 (the distance from the distal end surface 41 to the proximal end surface 42) is the same as the distance L from the groove 15b of the chuck 1 to the measurement step surface 18, It is also possible to set the driving height H irrespective of such a dimensional relationship, that is, the overall length of the outer pipe 4 may not be the same as the distance L.
For example, an arbitrary dimension reference position (reference plane) is set in a coordinate system fixed to the valve stem seal 90. Next, a position corresponding to the dimension reference position in a state where the valve stem seal 90 is set is set as a “chuck side reference position (chuck side reference surface)” in a coordinate system fixed to the chuck 1. In the installer 10 using the chuck 1, the distance from the distal end surface 41 of the outer pipe 4 to the “chuck side reference position” only needs to be equal to the distance from the proximal end surface 42 of the outer pipe 4 to the measurement step surface 18. Become.

  Therefore, if the dimension from the “chuck side reference position” of the chuck 1 to the measurement step surface 18 is the same as the entire length of the outer pipe 4, the valve spring seat 85 is moved from the dimension reference position arbitrarily set to the valve stem seal 90. And the distance from the base end face 42 of the outer pipe 4 to the measurement step surface 18 coincide with each other. That is, the installer 10 of the above-described embodiment is an example where the “chuck side reference position” is the shoulder receiving surface 14b (groove 15b), and the “chuck side reference position” is set to an arbitrary position. The length of the outer pipe 4 and the size of the chuck 1 can be considered variously by changing the “chuck side reference position”.

In the above-described embodiment, the installer 10 for manually press-fitting the valve stem seal 90 to the valve guide 82 is illustrated. However, the structure of the installer 10 is applied to a machine for automatically attaching the valve stem seal 90. It is also possible to do. For example, productivity can be further improved by applying to the seat holder of a production equipment apparatus as described in the above-mentioned patent document 1.
The installer 10 described above can be applied to both a diesel engine and a gasoline engine.

DESCRIPTION OF SYMBOLS 1 Chuck 1a Support part 1b Shaft part 1c Knob part 2 Sleeve 3 Small lock nut (2nd variable positioning member, annular member)
4 Outer pipe 5 Lock nut (variable positioning member, annular member)
6 Guide pin 7 Cap 10 Installer 10a Internal part 10b External part 10c Core part 14 Recessed part 14a Tube receiving surface (gripping piece)
14b Shoulder bearing surface 15a Expanded diameter portion 15b Groove (reference line)
17 Inner cylinder surface (cavity)
18 Measurement step surface 21a Surface portion (pressing end)
41 Tip surface (contact surface)
42 Base end face (measurement face)
82 Valve guide 82a Upper end surface 83 Valve stem 85 Valve spring seat 90 Valve stem seal 91 Reinforcing sleeve 91a Tube portion 91b Shoulder portion 91c Lower end surface 92 Seal rubber 92a Seal base portion 92b Seal lip portion 92c Lower end surface H Driving height

Claims (13)

An assembly tool for assembling a valve stem seal to an engine valve guide,
An internal part having a support for supporting the valve stem seal;
A cylindrical hollow shaft portion into which the internal part is inserted, and an outer pipe having a contact surface that is provided on one end side of the hollow shaft portion and contacts the engine when assembled;
A variable positioning member is provided that positions the internal part relative to the outer pipe in a changeable manner according to the distance between the valve stem seal supported by the internal part and the contact surface. , Valve stem seal assembly tool. The outer pipe has a measurement surface formed in parallel with the contact surface on the other end side of the hollow shaft portion,
The support portion has a recess that engages the outside of the valve stem seal;
The internal part has a shaft-shaped shaft body portion provided with the support portion on one end side, and a step-shaped measurement step surface is formed on the other end side of the shaft body portion,
The length between the abutment surface of the outer pipe and the measurement surface is the same as the length between the inner end of the indented portion and the measurement cross section of the internal part. Valve stem seal assembly tool. The internal part has a sleeve screwed to the outer periphery of the shaft body part,
The outer pipe is screwed to the outside of the sleeve;
3. The valve stem seal according to claim 2, wherein the variable positioning member is formed of an annular member screwed to the outer periphery of the shaft body portion so as to be in contact with the measurement surface of the outer pipe. Assembly tool. The internal part is thinner than the shaft body portion, and has a knob portion provided extending from the end portion on the other end side of the shaft body portion in the axial direction of the shaft body portion,
The valve stem seal assembling tool according to claim 3, wherein the measurement cross section is provided between the shaft body part and the knob part so as to be perpendicular to the axis of the shaft body part. The valve stem seal assembling tool according to claim 3 or 4, wherein a pitch of the screw of the shaft body portion and the screw of the sleeve is the same. 6. The valve stem seal assembly tool according to claim 5, wherein the pitch is 1 millimeter. The valve stem seal assembling tool according to any one of claims 3 to 6, wherein an outer shape of the variable positioning member is formed to be smaller than the measurement surface of the outer pipe. The valve stem seal assembling tool according to claim 1 or 2, wherein the support portion of the internal part has a variable diameter structure that deforms in accordance with an outer diameter of the valve stem seal. The support portion is arranged so as to spread in a conical surface at a predetermined interval on the outer periphery of the valve stem seal, and has a plurality of gripping pieces for gripping the valve stem seal from the outside,
The sleeve is provided so as to be movable in the generatrix direction of the plurality of gripping pieces arranged in a conical surface, and presses the gripping pieces in a direction close to each other according to the position in the generatrix direction Have
The valve stem seal assembling tool according to any one of claims 3 to 7, further comprising a second variable positioning member that positions the sleeve relative to the shaft body portion so as to be changeable. 10. The valve stem according to claim 9, wherein the second variable positioning member includes an annular member screwed to an outer periphery of the shaft body portion so as to be in contact with the other end portion of the sleeve. Seal assembly tool. The support portion is
A window portion opened to visually confirm the valve stem seal supported by the support portion;
11. The apparatus according to claim 8, further comprising a reference line provided at a position adjacent to the window portion and corresponding to a shoulder portion of the valve stem seal. Valve stem seal assembly tool. With an axial guide pin having an outer diameter corresponding to the inner diameter of the valve guide,
The said internal part has a hollow part which has a cylindrical axis | shaft which corresponds to the centerline of the said valve stem seal supported by the said support part, and the said guide pin is inserted in the inside. The valve stem seal assembly tool according to any one of the above. 13. The valve stem seal assembling tool according to claim 12, further comprising a cap that detachably holds one end of the guide pin and that fixes the guide pin inserted into the hollow portion to the internal part. .

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