JP2014105595A - Spring retainer assembling method, spring retainer, and assembling jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring retainer assembling method capable of smoothly assembling a spring retainer receiving a compressed coil spring, to a shaft portion.SOLUTION: A plunger spring 9 is set around a shaft portion 5 of a plunger 5 (Fig. 6(A)). An end portion of the plunger spring 9 is inserted into an opening portion 16 of an assembling jig 14 to be abutted on a spring pressing portion 18, and the plunger spring 9 is compressed by the assembling jig 14 (Fig.6(B)). A spring retainer 8 is inserted into an outer peripheral groove 10 of the shaft portion 5 projecting from the opening portion 16 of the assembling jig 14 to mount the spring retainer 8 on the shaft portion 5, and a cut portion 12 of the spring retainer 8 is matched to the spring pressing portion 18 of the mounting jig 14. The mounting jig 14 is separated from the spring retainer 8 and the plunger spring 9 by allowing the spring pressing portion 18 to pass the cut portion 12, and the plunger spring 9 is brought into contact with the spring retainer 8 (Fig.6(C)).

Description

  The present invention relates to a spring retainer assembling method for assembling a spring retainer that receives an end of a coil spring into an outer peripheral groove formed in a shaft portion such as a plunger, and a spring retainer and assembling used in this assembling method. It relates to a jig.

  Generally, a movable member (valve, plunger, etc.) biased to one side by the spring force of a coil spring, such as a plunger used in a plunger pump such as an intake / exhaust valve of an internal combustion engine or a high-pressure fuel pump, is coiled by a cam or the like. In the mechanism that moves the spring against the spring force of the spring, a spring retainer that receives one end of the coil spring is attached to the shaft of the movable member. In this case, for example, an outer peripheral groove is formed in the shaft portion of the movable member, an attachment groove to be inserted into the outer peripheral groove of the shaft portion is formed in the spring retainer, and the spring retainer is inserted by inserting the attachment groove into the outer peripheral groove. It is attached to the shaft of the movable member. Alternatively, as described in Patent Document 1, for example, the spring retainer can be moved by inserting a halved tapered cotter engaged with the outer peripheral groove of the shaft portion into a tapered hole formed in the spring retainer. It is attached to the shaft of the member. At this time, the spring retainer is attached to the shaft portion in a state where the coil spring is compressed and held to a predetermined position using a jig.

JP 2002-285810 A

  For this reason, in the spring retainer having a mounting groove, the process of releasing the compression of the coil spring by the jig and bringing the coil spring into contact with the spring retainer after assembling the spring retainer on the shaft portion is complicated. ineffective. In particular, if the spring force of the coil spring is large, such as the plunger of a high-pressure plunger pump or the intake / exhaust valve of an engine, a large load is applied to the jig, so the compression by the jig is released and the coil spring is applied to the spring retainer. It becomes difficult to smoothly perform the contact process.

When using a cotter, use a jig to compress and hold the coil spring from above the spring retainer, insert the cotter between the retainer and the shaft groove, and release the holding by the jig. As a result, a relatively smooth assembly can be performed, but since the number of parts is large, the weight is large and the manufacturing cost is also high.
In addition, it is conceivable to fix the spring retainer to the shaft portion using a locking tool such as a snap ring, but there are problems in terms of load resistance and durability.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a spring retainer assembling method capable of smoothly assembling a spring retainer that receives a compressed coil spring to a shaft portion. .

In order to solve the above problems, the present invention is a spring retainer assembling method for attaching a spring retainer that receives one end of a coil spring disposed around a shaft portion and compressed to the shaft portion,
An outer peripheral groove is formed in the shaft portion,
The spring retainer has a mounting groove to be inserted into the outer peripheral groove and attached to the shaft portion, and a cutout portion is provided in the outer peripheral portion.
An assembly jig is provided that has a spring pressing portion that engages from the outside in the radial direction at the end of the coil spring, and that allows the spring retainer to pass through by aligning the spring pressing portion with the notch. ,
With the assembly jig, the spring pressing portion is engaged with the end of the coil spring to compress the coil spring, and the spring retainer is inserted into the outer peripheral groove of the shaft portion protruding through the assembly jig. The mounting groove is inserted to attach the spring retainer to the shaft portion, align the notch portion of the spring retainer with the spring pressing portion of the assembly jig, release the compression of the coil spring, and perform the assembly. The spring retainer is passed through a jig, the assembly jig is separated from the coil spring and the spring retainer, and the end of the coil spring is brought into contact with the spring retainer.

(Aspect of the Invention)
In the following, some aspects of the invention that can be claimed in the present invention (hereinafter sometimes referred to as “claimable invention”) will be exemplified and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention. The contents of (1), (2), (4) and (5) below correspond to claims 1, 2, 3 and 4, respectively.

(1) A spring retainer assembling method for attaching a spring retainer that receives one end of a compressed coil spring disposed around a shaft portion to the shaft portion,
An outer peripheral groove is formed in the shaft portion,
The spring retainer has a mounting groove to be inserted into the outer peripheral groove and attached to the shaft portion, and a cutout portion is provided in the outer peripheral portion.
An assembly jig is provided that has a spring pressing portion that engages from the outside in the radial direction at the end of the coil spring, and that allows the spring retainer to pass through by aligning the spring pressing portion with the notch. ,
With the assembly jig, the spring pressing portion is engaged with the end of the coil spring to compress the coil spring, and the spring retainer is inserted into the outer peripheral groove of the shaft portion protruding through the assembly jig. The mounting groove is inserted to attach the spring retainer to the shaft portion, align the notch portion of the spring retainer with the spring pressing portion of the assembly jig, release the compression of the coil spring, and perform the assembly. A spring retainer assembly, wherein the spring retainer is passed through a jig, the assembly jig is separated from the coil spring and the spring retainer, and an end of the coil spring is brought into contact with the spring retainer. Method.
With this configuration, the spring retainer can be attached to the outer peripheral groove of the shaft portion by holding the coil spring in a compressed state with the assembling jig. Then, by aligning the notch part of the spring retainer with the spring pressing part of the assembling jig, the notch part becomes a relief when releasing the compression of the coil spring by the assembling jig, so that the spring retainer is spring-pressed. The assembly jig can pass through without interfering with the part, and the assembly jig can be pulled away from the coil spring and the spring retainer.
(2) In (1), the assembling jig has an opening into which the coil spring and the spring retainer can be inserted, and the spring pressing portion is provided on an inner peripheral portion of the opening. A spring retainer assembling method characterized by the above.
With this configuration, the coil spring and the spring retainer are guided by the opening, so that stable assembly can be performed.
(3) The spring retainer assembling method according to (1) or (2), wherein the spring pressing portions are arranged at equal intervals or symmetrically along the circumferential direction of the coil spring.
With this configuration, the coil spring can be compressed with a good balance.
(4) A spring retainer used in the spring retainer assembling method of any one of (1) to (3).
(5) An assembling jig used in the spring retainer assembling method of any one of (1) to (3).

  According to the spring seat assembling method of the present invention, the retainer that receives the compressed coil spring can be smoothly assembled to the shaft portion.

It is a longitudinal cross-sectional view which shows the spring retainer attaching part of the axial part of the plunger in the plunger pump to which the spring retainer assembling method which concerns on one Embodiment of this invention is applied. It is a top view of the spring retainer assembled | attached to the plunger pump shown in FIG. It is a longitudinal cross-sectional view by the AA line of FIG. It is a longitudinal cross-sectional view by the BB line of FIG. 5 of the assembly jig | tool used for the spring retainer assembly method which concerns on one Embodiment of this invention. It is a top view of the assembly jig | tool shown in FIG. It is a figure which shows the assembly process of the spring retainer by the spring retainer assembly method in one Embodiment of this invention. It is a top view which shows the process of attaching a spring retainer to the outer periphery groove | channel of a shaft part in the spring retainer assembly | attachment process shown in FIG. It is a top view of the spring retainer and assembly jig concerning other embodiments of the present invention. It is a flowchart which shows the assembly process of the spring retainer by the spring retainer assembly method which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a semi-assembly of a high-pressure plunger pump to which a spring retainer assembling method according to an embodiment of the present invention is applied. This plunger pump is incorporated in an automobile engine and pressurizes fuel supplied from a fuel tank through a fuel line by a low-pressure fuel pump and supplies the pressurized fuel to a high-pressure fuel injector. A state in which a plunger spring and a spring retainer are assembled to the part is shown.

  As shown in FIG. 1, in the plunger pump semi-assembly 1, a plunger 4 is slidably guided by a substantially cylindrical plunger guide 3 mounted on a pump body 2. A small-diameter shaft portion 5 is integrally formed at one end portion of the plunger 4 protruding from the plunger guide 3. In the pump body 2, the periphery of the protruding portion of the plunger 4 protrudes in a cylindrical shape to form a spring receiving portion 2A. A spring seat 6 is brought into contact with the spring receiving portion 2 </ b> A and is held by a ring-shaped retainer 7. A spring retainer 8 is attached to the tip of the shaft portion 5 of the plunger 4. A plunger spring 9, which is a compression coil spring, is interposed between the spring seat 6 and the spring retainer 8 in a state where it is compressed by a predetermined amount.

  The spring seat 6 has a cylindrical large-diameter portion 6A having a bottom and a cylindrical small-diameter portion 6C that rises from an opening provided at the center of the bottom 6B of the large-diameter portion 6A and protrudes from the opening side of the large-diameter portion 6A. And are integrally formed. The inside of the small diameter portion 6C is a stepped hole having a small diameter on the tip side and having a step portion 6D. The spring seat 6 is attached to the pump body 2 such that the bottom 6B is brought into contact with the spring receiving portion 2A of the pump body 2 and the ring-shaped retainer 7 is fitted to the outer periphery of the large diameter portion 6A and the spring receiving portion 2A. Yes. One end portion of the plunger 4 is inserted into the small diameter portion 6C, and a step formed between the plunger 4 and the shaft portion 5 abuts on the step portion 6D of the small diameter portion 6C, whereby the protruding position of the plunger 4 and the shaft portion 5 is reached. Is stipulated.

  An outer peripheral groove 10 is formed at the distal end portion of the shaft portion 5 of the plunger 4, and a spring retainer 8 is attached to the outer peripheral groove 10. As shown in FIGS. 2 and 3, the spring retainer 8 has a substantially disc shape and a hat shape in which the flange portion 11 is integrally formed on the outer periphery on one end side, that is, the cross-sectional shape is a substantially convex shape. The spring retainer 8 is curved so that the center portion is convex inward. The inner diameter and outer diameter of the flange portion 11 of the spring retainer 8 are substantially equal to the inner diameter and outer diameter of the plunger spring 9, and the spring retainer 8 is fitted inside the plunger spring 9, and the end of the plunger spring 9 is connected to the flange portion. 11 to receive. A plurality (three in the illustrated example) of substantially arc-shaped cutouts 12 are provided on the outer peripheral portion of the flange portion 11 at equal intervals along the circumferential direction. One of the notches 12 extends to the center of the spring seat 10 to form a substantially U-shaped attachment groove 13. In other words, the mounting groove 13 also serves as one of the notches 12. The width of the center side of the spring seat 10 of the mounting groove 13 is smaller than that of the outer peripheral side and is substantially equal to the outer diameter of the outer peripheral groove 10 of the shaft portion 5 of the plunger 4 so that it can be inserted into the outer peripheral groove 10.

  The spring retainer 8 is fixed in the axial direction by inserting the mounting groove 13 into the outer peripheral groove 10 of the shaft portion 5 of the plunger 4. A plunger spring 9, which is a coil spring provided on the outer periphery of the shaft portion 5 of the plunger 4 protruding from the small diameter portion 6 </ b> C of the spring seat 6 and the small diameter portion 6 </ b> C, is located between the bottom portion 6 </ b> B of the spring seat 6 and the flange portion 11 of the spring retainer 8. It is inserted in a compressed state. Thereby, the plunger 4 is biased to one side (upward in FIG. 1) by the spring force of the plunger spring 9, and is elastically held in a state of being in contact with the step portion 6 </ b> D of the plastic spring seat 8. The spring retainer 8 is held in the radial direction by being fitted to the end of the plunger spring 9.

  Then, a cam (not shown) is brought into contact with the tip of the shaft portion 5 of the plunger 4, and the rotation of the cam presses the shaft portion 5 to resist the spring force of the valve spring 9 to move the plunger 4 to the other ( The plunger 4 is moved back and forth along the cam profile.

Next, an assembly method for assembling the spring retainer 8 to the outer peripheral groove 10 of the shaft portion 5 of the plunger 4 will be described.
4 and 5 show an assembling jig 14 used in this assembling method. As shown in FIGS. 4 and 5, the assembly jig 14 has a substantially bottomed cylindrical shape, and has an opening 16 at the center of the bottom 15. A tapered guide portion 17 is formed between the inner wall of the side portion of the assembly jig 14 and the opening portion 16 of the bottom portion 15. The opening 16 of the assembly jig 14 has substantially the same diameter as the outer diameters of the spring retainer 8 and the plunger spring 9, and these can be inserted. A spring pressing portion 18 having substantially the same shape and the same size as the arc-shaped cutout portion 12 of the spring retainer 8 is projected inwardly on the inner peripheral edge portion outside the opening portion 16 in plan view (see FIG. 5). Yes. The same number of spring pressing portions 18 are arranged at the same circumferential position with respect to a plurality of (three in the illustrated example) notch portions 12 of the spring retainer 8, and the notch portions 12, the spring pressing portions 18, Thus, the spring retainer 8 can be passed through the opening 16. In addition, when the plunger spring 9 is inserted into the opening 16 from the inside of the assembly jig 14, the plurality of spring pressing portions 18 come into contact with the end of the plunger spring 9 from the outside in the radial direction, thereby opening the opening 16. Can't pass.

  On the outer end surface of the bottom portion 15 of the assembly jig 14, a positioning projection 19 that engages with the mounting groove 13 of the spring retainer 8 is projected on one of the plurality of spring pressing portions 18. A flange portion 20 is integrally formed on the outer periphery of the end portion on the opening side of the assembly jig 14.

Next, with reference to FIGS. 6, 7, and 9, the process of compressing the plunger spring 9 using the assembly jig 14 and attaching the spring retainer 8 to the outer peripheral groove 10 of the shaft portion 5 of the plunger 4 will be described. To do.
As shown in FIG. 6A, the plunger 4, the spring seat 6 and the retainer 7 are assembled to the pump body 2 to which the plunger guide 3 is attached, and the plunger spring 9 is set on the spring seat 6.

  As shown in FIG. 6 (B), the plunger spring 9 set on the spring seat 6 is covered with an assembly jig 14, and the tip end of the plunger spring 9 is inserted into the opening 16 to form the spring pressing portion 18. Make contact. At this time, the distal end portion of the plunger spring 9 is guided by the tapered guide portion 17 and can be smoothly inserted into the opening portion 16. Then, the assembly jig 14 is pressed to compress the plunger spring 9, and the tip end portion of the shaft portion 5 of the plunger 4 protrudes from the opening 16 of the assembly jig 14. The outer peripheral groove 10 of the shaft portion 5 is exposed. At this time, the assembling jig 14 can be driven using an actuator (not shown) such as an air cylinder or an electric motor, and if the force necessary to compress the plunger spring 9 is obtained, It may be driven manually.

  In this state, as shown in FIG. 7, the spring retainer 8 is moved from the side of the assembly jig 15 along the bottom portion 15 to insert the mounting groove 13 into the outer peripheral groove 10 of the shaft portion 5. The positioning projection 19 is engaged. As a result, the plurality of notches 12 of the spring retainer 8 and the plurality of spring pressing portions 18 of the assembly jig 14 are aligned.

  Thereafter, as shown in FIG. 6C, the pressing of the plunger spring 9 by the assembly jig 14 is released, and the mounting jig 14 is pulled away from the plunger spring 9 and the spring retainer 8. At this time, the notch 12 of the spring retainer 9 and the spring pressing portion 18 of the assembly jig 14 are aligned, and the spring retainer 9 can pass through the opening 16 of the assembly jig 14. The attachment jig 14 can be pulled away from the plunger spring 9 and the spring retainer 8. As a result, the plunger spring 9 expands due to its elasticity, and its distal end fits into the spring retainer 8 and comes into contact with the flange 11 to urge the plunger 4 and hold the spring retainer 8 in the radial direction. . In this manner, the spring retainer 8 can be assembled to the outer peripheral groove 10 of the shaft portion 5 of the plunger 4 and the plunger spring 9 can be interposed between the spring seat 6 and the spring retainer 8 in a compressed state.

  Next, assuming the assembling apparatus provided with the assembling jig 14, the process of assembling the spring retainer 8 to the outer peripheral groove 10 of the shaft portion 5 of the plunger 4 will be described mainly with reference to the flowchart shown in FIG. To do. Referring to FIG. 9, in step S1, the subassembly 1 (work) before mounting the plunger spring 9 and the spring retainer 8 is set in the assembling apparatus, and in step S2, the plunger spring 9 is set in the spring seat 6. (See FIG. 6A).

  In step S3, the assembling jig 14 is set on the plunger spring 9. In step S 4, the assembly jig 14 is driven and lowered by an actuator or the like, the end of the plunger spring 9 is inserted into the opening 16 of the assembly jig 14, and the spring pressing portion 18 is brought into contact with the plunger spring 9. And the plunger spring 9 is compressed. In step S5, it is determined whether or not the shaft portion 5 of the plunger 4 protrudes on the assembly jig 14 until the outer peripheral groove 10 is exposed. This determination can be performed using an appropriate detection means such as a limit switch, a proximity switch, or an optical sensor. When the shaft portion 5 of the plunger 4 protrudes on the assembly jig 14 until the outer peripheral groove 10 is exposed in step S5, the process proceeds to step S6, and the mounting groove 13 of the spring retainer 8 is moved to the shaft portion 5 of the plunger 4. The outer peripheral groove 10 is inserted into contact with the positioning protrusion 19 (stopper) of the assembling jig 14, and the process proceeds to step S9 (see FIG. 6B). At this time, the spring retainer 8 can be inserted into the outer peripheral groove 10 of the shaft portion 5 using an appropriate means such as a pusher, or may be inserted manually. If the shaft portion 5 of the plunger 4 does not protrude until the mounting groove 10 is exposed on the assembly jig 14 in step S5, an abnormality is determined in step S7, and the workpiece is paid out in step S8.

  In step S9, it is determined whether or not the mounting groove 13 of the spring retainer 8 is in contact with the positioning protrusion 19 (stopper). The contact of the mounting groove 13 with the positioning protrusion 19 can be determined using an appropriate detection means such as a limit switch, a proximity switch, or an optical sensor. If the mounting groove 13 of the spring retainer 8 comes into contact with the positioning protrusion 19 in step S9, the assembling jig 14 is raised in step S10, and the spring pressing portion 18 of the assembling jig 14 is moved to the notch portion of the spring retainer 8. 12, the assembly jig 14 is removed from the plunger spring 9 and the spring retainer 8 (see FIG. 6C), and the subassembly 1 in which the plunger spring 9 and the spring retainer 8 are assembled is carried out in step S11. To do. If the mounting groove 13 does not come into contact with the positioning protrusion 19 in step S9, an abnormality is determined in step 12, and the workpiece is paid out in step S13. In this way, the plunger spring 9 and the spring retainer 8 can be assembled to the subassembly 1 (workpiece) using the assembling apparatus.

  In the above-described embodiment, the case where three notch portions 12 of the spring retainer 8 and three spring pressing portions 18 of the assembling jig 14 are provided is illustrated and described. However, one or more of these may be provided. it can. FIG. 8 shows a case where two of these are provided. In order to compress the plunger spring 9 in a balanced manner by the spring pressing portion 18, the notch portion 12 of the spring retainer 8 and the spring pressing portion 18 of the assembly jig 14 are two or more at equal intervals along the circumferential direction. Alternatively, it is desirable to arrange a plurality at symmetrical positions.

  DESCRIPTION OF SYMBOLS 5 ... Shaft part, 8 ... Spring retainer, 9 ... Plunger spring (coil spring), 10 ... Outer peripheral groove, 12 ... Notch part, 13 ... Mounting groove, 14 ... Assembly jig | tool, 16 ... Opening part, 18 ... Spring press Part

Claims (4)

A spring retainer assembling method for attaching a spring retainer that receives one end of a compressed coil spring disposed around a shaft portion to the shaft portion,
An outer peripheral groove is formed in the shaft portion,
The spring retainer has a mounting groove to be inserted into the outer peripheral groove and attached to the shaft portion, and a cutout portion is provided in the outer peripheral portion.
An assembly jig is provided that has a spring pressing portion that engages from the outside in the radial direction at the end of the coil spring, and that allows the spring retainer to pass through by aligning the spring pressing portion with the notch. ,
With the assembly jig, the spring pressing portion is engaged with the end of the coil spring to compress the coil spring, and the spring retainer is inserted into the outer peripheral groove of the shaft portion protruding through the assembly jig. The mounting groove is inserted to attach the spring retainer to the shaft portion, align the notch portion of the spring retainer with the spring pressing portion of the assembly jig, release the compression of the coil spring, and perform the assembly. A spring retainer assembly, wherein the spring retainer is passed through a jig, the assembly jig is separated from the coil spring and the spring retainer, and an end of the coil spring is brought into contact with the spring retainer. Method.   2. The assembly jig according to claim 1, wherein the assembly jig has an opening into which the coil spring and the spring retainer can be inserted, and the spring pressing portion is provided on an inner peripheral portion of the opening. The spring retainer assembly method described.   The spring retainer used for the spring retainer assembling method of Claim 1 or 2.   An assembling jig used in the spring retainer assembling method according to claim 1 or 2.

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