JP6579823B2 - Spring load adjusting device and spring load adjusting method - Google Patents

Description

  The present invention relates to a spring load adjustment device and a spring load adjustment method suitable for adjusting, for example, a spring set load of a valve body of an electromagnetic valve.

  A spool valve type solenoid valve using a spool valve is known as an electromagnetic valve that controls the pressure of a fluid in accordance with an electric signal. This solenoid valve changes the hydraulic pressure supplied according to the applied current, and is used, for example, in a hydraulic circuit of an automatic transmission of a vehicle.

  The hydraulic characteristics of this type of solenoid valve have a standard width, and there is no problem if the current-hydraulic characteristics are within the range of the standard, but because the vehicle is developed based on the standard value of the standard, The closer it is, the better the performance. Of course, it will not function properly outside the standard, so it must be within the standard of current-hydraulic characteristics at worst.

  In this type of solenoid valve, an adjuster is provided to adjust the hydraulic characteristics within a standard range. The adjuster is accommodated in a sleeve constituting the electromagnetic valve together with a spool serving as a valve body. The outer diameter of the adjuster is processed into a male thread, and the inner diameter of the sleeve is processed into a female thread. A spring is installed between the adjuster and the spool, and the set load of the spring can be adjusted by tightening or loosening the adjuster screw. After adjusting to the optimal set load position, crimping is performed to crush the threads of the male and female threads to prevent the adjuster from loosening.

  When manufacturing solenoid valves, adjust the adjuster tightening degree while measuring the pressure at the pressure adjustment point, and fix the position of the adjuster by caulking when the pressure reaches the standard value. is doing. However, if the adjuster is misaligned during caulking, the set pressure also deviates from the median value, so the smaller the caulking misalignment, the better. In addition, since there is variation in the inclination of the current-hydraulic characteristics, if there is a pressure deviation after caulking, it is better that the caulking deviation is smaller from the viewpoint of being out of specification.

  Conventionally, by pressing the sleeve from the outside with a conical caulking punch, the sleeve is deformed to the inner diameter side and the adjuster is fixed. However, since there is a backlash in the axial direction between the male screw of the adjuster and the female screw of the sleeve, and the pressing position of the punch and the position of the thread are not constant, the adjuster is displaced in the axial direction due to the positional relationship between the punch and the thread. There are cases where there is no deviation. For this reason, the axial displacement of the adjuster fixed by the caulking process is large and small, and this changes the set load of the spring. appear.

JP 2012-220013 A JP-A-9-166238

  In order to eliminate the variation after caulking as described above, for example, in Patent Document 1, the position of the first caulking punch having a quadrangular shape is temporarily determined, and then a round shape having a smaller shape than the first caulking punch is used. The caulking process is performed with the axial position determined by two caulking punches. However, although the positional deviation in the axial direction can be suppressed to some extent, the position adjustment and the caulking work must be performed twice, which increases the work man-hours. In addition, since the first caulking punch and the second caulking punch are two steps, the caulking apparatus becomes complicated, and the cycle time becomes longer and the productivity is lowered.

  In Patent Document 2, a through hole is provided in advance in a sleeve, and a screw thread of an adjuster is crushed by a caulking pin inserted from the through hole. However, this technique has a drawback that a through hole must be provided in the sleeve in advance, which requires a large number of processing steps. In addition, when the tip of the crimping pin hits the slope of the thread, the adjuster is pushed in the axial direction by the crimping pin and its position changes, causing a phenomenon in which the adjusted spring pressure is slightly shifted.

  Such variation in positioning due to the caulking process occurs not only in the spool valve type solenoid valve but also in other solenoid valves and devices that position the adjuster while applying a spring load.

  It is an object of the present invention to provide a spring load adjusting device and a spring load adjusting method that improve workability and adjuster positioning accuracy in a caulking process.

The spring load adjusting device of the present invention has the following configuration.
(1) A sleeve having a hollow portion extending in the axial direction.
(2) A member to be pressed housed inside the sleeve.
(3) An adjuster provided so as to be movable in the axial direction of the sleeve with respect to the end portion of the sleeve.
(4) A screw provided on each of the sleeve and the adjuster and screwed together.
(5) A spring that is accommodated between the pressed member and the adjuster inside the sleeve, and is pressed toward the pressed member as the adjuster moves in the axial direction by tightening the screw.
(6) A plurality of caulking portions that are pressurized from the outer periphery of the sleeve toward the central axis and deform at least one of the sleeve side screw and the adjuster side screw.
(7) The plurality of crimp portions are provided at predetermined intervals along the axial direction of the sleeve, and the inclined surface of the thread in which the pressing force by the plurality of crimp portions is inclined in different directions in the screw. Press.

In the present invention, the following configuration is preferable.
(1) The plurality of caulking portions are arranged with a distance that is an integral multiple of 1.5 times the pitch of the thread in the axial direction of the sleeve.
(2) The plurality of caulking portions are two places, which is 1.5 times the pitch of the thread.
(3) The spring is a coil spring.
(4) The thread portion on the sleeve side is provided on the inner surface of the hollow portion of the sleeve, and the thread portion on the adjuster side is provided on the outer peripheral surface of the adjuster.
(5) A cylindrical portion is provided in a part of the adjuster, the end portion of the sleeve is accommodated inside the cylindrical portion, and the thread portion on the sleeve side is provided on the outer peripheral surface of the end portion of the sleeve. The screw portion on the adjuster side is provided on the inner surface of the adjuster.

(6) The sleeve is a body portion of the solenoid valve, the pressed member is a spool valve of the solenoid valve, and a plunger that abuts on one end side of the spool valve is provided on the proximal end side in the axial direction of the sleeve. An electromagnetic solenoid is fixed, and the spring, the adjuster, the screw portion, and the caulking portion are provided on the distal end side in the axial direction of the sleeve.

The spring load adjusting method of the present invention has the following steps.
(1) A step of inserting the pressed member into the sleeve having a hollow portion extending in the axial direction.
(2) A step of inserting a spring into the sleeve and bringing one end thereof into contact with the end of the pressed member.
(3) A step of attaching an adjuster to the end of the sleeve so as to be movable in the axial direction.
(4) Tighten the screws that are provided on each of the sleeve and the adjuster and are screwed to each other, move the adjuster along the axial direction of the sleeve, press the screw toward the pressed member, A step of adjusting the spring pressure applied to the pressed member.
(5) The sleeve side screw is pressed by a plurality of caulking portions provided at predetermined intervals along the axial direction of the sleeve so as to press the inclined surfaces of the threads inclined in different directions in the screw. And a step of deforming at least one thread of the adjuster side screw.

  According to the present invention, since the plurality of caulking portions press the inclined surface of the thread that is inclined in different directions, the direction in which the pressing force is applied by the plurality of caulking portions is opposite, so the axial force applied to the adjuster Is offset. As a result, when the screw thread is pressed by the caulking portion, the axial displacement of the adjuster is reduced, and the variation in the spring set load is reduced.

It is a longitudinal cross-sectional view of 1st Embodiment. Sectional drawing which shows the effect | action of the crimping part in 1st Embodiment. Sectional drawing of a state without the position shift of a crimping part. Sectional drawing of a state where a caulking part has shifted by 0.1 pitch to the right. Sectional drawing of a state where the caulking portion is shifted to the right by 0.2 to 04 pitches. Sectional drawing of a state where a caulking part has shifted 0.5 pitches to the right. Sectional drawing of a state where the caulking portion is shifted by 0.6 pitch to the right. Sectional drawing of a state where a caulking part has shifted by 0.7 pitch to the right. Sectional drawing of a state where the caulking portion is shifted by 0.8 to 1 pitch to the right. Sectional drawing which shows the effect | action of the crimping part in a prior art. The graph which shows the position shift of the adjuster in 1st Embodiment. The graph which shows the position shift of the adjuster in a prior art. The graph which shows the electric current-hydraulic characteristic of 1st Embodiment. It is a longitudinal cross-sectional view of 2nd Embodiment. It is a longitudinal cross-sectional view of 3rd Embodiment.

[1. First Embodiment]
[1.1 Configuration]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the first embodiment, the present invention is applied as a load adjustment device for a coil spring that regulates the amount of movement of a spool valve in an electromagnetic valve, and the pressed member of the present invention corresponds to a spool valve. In this embodiment, the axis refers to the central axis along the longitudinal direction of the sleeve incorporating the spool valve. When simply referred to as the circumferential direction or the axial direction, the circumferential direction of the central axis or the axial direction of the central axis Indicates.

  FIG. 1 shows a longitudinal sectional view of the electromagnetic valve of this embodiment. The solenoid valve according to the present embodiment includes a drive unit 10 and a nozzle 20 provided integrally therewith.

  The drive unit 10 includes a coil 12 fixed inside a cylindrical housing 11, a resin layer 13 covering the coil 12, and a cylindrical core provided on the inner periphery of the coil 12 and fixed to the housing 11. 14 A plunger 15 that is attracted by the coil 12 and moves in the core 14 is inserted in the center of the core 14, and a pin 16 that moves together with the plunger 15 is inserted on the nozzle 20 side of the plunger 15.

  The nozzle 20 has a cylindrical sleeve 21 and a spool valve 22 inserted therein so as to be slidable in the axial direction. The sleeve 21 is provided with a plurality of ports 21a, 21b, and 21c so as to penetrate the wall surface. The spool valve 22 is provided with valve portions 22a, 22b, and 22c that open and close the ports 21a, 21b, and 21c. The end of the pin 16 on the side opposite to the plunger 15 is in contact with the end of the spool valve 22 on the drive unit 10 side. A recess 23 is provided at the end of the spool valve 22 opposite to the drive unit 10, and one end of a coil spring 24 is inserted into the recess 23.

  An adjuster 25 is screwed into the end of the sleeve 21 opposite to the drive unit 10. That is, a female screw 26 is formed on the inner periphery of the end portion of the sleeve 21, a male screw 27 is formed on the outer periphery of the adjuster 25, and the adjuster 25 is screwed on the end portion of the sleeve 21 by screwing the male screw 27 into the inner periphery of the female screw 26. It is attached. A recess 28 is provided on the end surface of the adjuster 25 on the drive unit 10 side, and the other end of the coil spring 24 is inserted into the recess 28.

  A groove 29 is provided on the outer end face of the adjuster 25, that is, the end face opposite to the coil spring 24, and the tightening amount of the adjuster 25 is adjusted by inserting the tip of the tool into the groove 29 and rotating the groove 29. To do. Instead of the groove 29, a knob capable of rotating the adjuster 25 with a fingertip can be provided.

  On the outer periphery of the sleeve 21, two caulking portions 30 a and 30 b that are pressurized from the outer periphery of the sleeve 21 toward the central axis are provided. The caulking portions 30a and 30b have a predetermined interval along the axial direction of the sleeve 21. Specifically, as shown in the enlarged view of FIG. 2, the thread pitch of the male screw 27 provided on the adjuster 25 is 1. It is provided at intervals of 5 times. Setting the interval between the two caulking portions 30a and 30b to be 1.5 times the interval between the thread pitches means that the pressing force by the two caulking portions 30a and 30b is inclined in different directions in the male screw 27. It means that the slope of the thread is pressed.

[1.2 Action]
The operation of the first embodiment having the above-described configuration is as follows.
In the present embodiment, when adjusting the load of the coil spring 24, the tip of the tool is inserted into the groove 29 of the adjuster 25 shown in FIG. 1 and rotated to adjust the degree of tightening of the adjuster 25. Set the spring load.

  When a predetermined spring load is reached, as shown in FIG. 2A, pressing is performed from the outer periphery of the sleeve 21 toward the central axis using a caulking punch having two pressing portions P1 and P2 at the tip. To do. Then, the wall surface of the sleeve 21 is plastically deformed by the pressing portions of the two caulking punches P1 and P2, and the tip ends of the two female threads 26 located at the portions are screw threads of the male screw 27 of the adjuster 25. Pressed against the slope.

  In this case, since the two caulking portions 30a and 30b formed by the pressing portions of the two caulking punches P1 and P2 are 1.5 times the thread pitch, depending on the position of the caulking punch. 2 (b), and the outer slope of the two adjacent threads, or the inner slope of the threads at both ends of the three threads, as shown in FIG. 2 (c). . 2 (b) and 2 (c), the two crimping portions 30a and 30b are deformed in a direction in which both side surfaces of the screw thread are pushed or pulled, so that the two crimping portions applied to the adjuster 25 are provided. The pressing forces 30a and 30b are canceled out, and the shift amount of the adjuster 25 from the position where the spring load is set is reduced.

  Next, it will be described with reference to FIGS. 3 to 9 that the displacement of the adjuster 25 is suppressed at any of the two caulking portions 30 a and 30 b in the axial direction of the adjuster 25. As shown in FIG. 3, when one side of the caulking punch is between the peak of the valley of the female screw 26 and the peak of the peak of the male screw 27 (range A in the figure), FIG. For the reason described in c), the male screw 27 and the adjuster 25 provided with the male screw 27 are not moved by the caulking process.

  As shown in FIG. 4A, when the positions of the caulking punches P1 and P2 are shifted from the position of FIG. 3 by about 0.1 pitch to the right in the figure, as shown in FIG. Since the deformation of the right caulking portion 30a can be made from the top of the thread of the male screw 27 of the adjuster 25 to the left side surface, the adjuster 25 is not displaced.

  As shown in FIG. 5A, when the positions of the caulking punches P1 and P2 are shifted from the position of FIG. 3 to the right by about 0.2 to 0.4 pitches, FIG. As shown, the deformation of the right caulking portion 30a pushes the right side surface of the thread of the male screw 27 of the adjuster 25, and the left side pushes the left side surface of the thread of the male screw 27. It will move to near the center of the gap. That is, the position shift of the adjuster 25 is suppressed to ½ of the gap between the female screw 26 and the male screw 27 at the maximum.

  As shown in FIG. 6A, when the positions of the caulking punches P1 and P2 are shifted from the position of FIG. 3 by about 0.5 pitch to the right in the drawing, as shown in FIG. Since the deformation of the right caulking portion 30 a pushes the right side surface of the thread of the male screw 27 of the adjuster 25 and the left side pushes the left side surface of the thread of the male screw 27, the adjuster 25 is in the center of the gap between the female screw 26 and the male screw 27. It tends to be on the left side of the neighborhood. That is, the position shift of the adjuster 25 is suppressed to ½ or less of the gap between the female screw 26 and the male screw 27.

  As shown in FIG. 7A, when the positions of the caulking punches P1 and P2 are shifted by about 0.6 pitches from the position in FIG. 3 to the right in the figure, as shown in FIG. Since the deformation of the left caulking portion 30a can be made from the top of the thread of the male screw 27 of the adjuster 25 to the left side, the adjuster 25 is not displaced.

  As shown in FIG. 8 (a), when the positions of the caulking punches P1 and P2 are shifted from the position of FIG. 3 to the right by about 0.7 pitches, as shown in FIG. 8 (b), Since the deformation of the caulking portion 30 a on the left side pushes the right side surface of the thread of the male screw 27 of the adjuster 25 and the right side pushes the left side surface of the thread of the male screw 27, the adjuster 25 is in the center of the gap between the female screw 26 and the male screw 27. It will move to the vicinity. That is, the position shift of the adjuster 25 is suppressed to ½ of the gap between the female screw 26 and the male screw 27 at the maximum.

  As shown in FIG. 9A, when the positions of the caulking punches P1 and P2 are shifted from the position of FIG. 3 to the right by about 0.8 to 1 pitch, as shown in FIG. 9B. Further, since the deformation of the left caulking portion 30 a pushes the right side surface of the thread of the male screw 27 of the adjuster 25 and the right side pushes the left side surface of the thread of the male screw 27, the adjuster 25 has a gap between the female screw 26 and the male screw 27. Will move to near the center. That is, the position shift of the adjuster 25 is suppressed to ½ of the gap between the female screw 26 and the male screw 27 at the maximum.

  In this regard, in the prior art described in FIGS. 10A to 10B, since the crimping portion 30a is provided at one location, the tip of the thread of the female screw 26 is only on one slope of the thread of the male screw 27. The adjuster 25 moves in the pressed direction. Since the movement amount of the adjuster 25 is equal to the size of the gap between the maximum female screw 26 and the male screw 27, the shift amount is twice as large as that of the present embodiment shown in FIGS. As a result, in the prior art, the amount of movement of the adjuster 25 is greater than in the present embodiment, and the variation in the hydraulic characteristic deviation before and after caulking is greater.

  FIG. 11 and FIG. 12 show data obtained by actually measuring how much the hydraulic pressure value before and after the caulking process changes between this embodiment and the prior art shown in FIG. According to the apparatus of the present embodiment shown in FIG. 11, it can be seen that the variation in the hydraulic pressure value before and after the caulking is reduced to about ½ compared to the prior art.

[1.3 Effect]
According to this embodiment, the following effects are exhibited.

(1) In this embodiment, since the interval between the two caulking portions 30a and 30b is 1.5 times the interval between the thread pitches, the pressing force by the two caulking portions 30a and 30b is a male screw. 27, pressing the slope of the thread inclined in different directions. As a result, when the caulking punch is driven, the force that causes the caulking portion to hit the slope of the screw thread and shift the adjuster 25 in the axial direction is canceled in two directions, and the movement of the adjuster 25 in the axial direction is suppressed. As a result, the possibility that the spring load of the coil spring 24 once set is deviated from the set value becomes low, and the current-hydraulic characteristic of the solenoid valve after the adjuster 25 is fixed becomes close to the median value, thereby improving the accuracy.

(2) As shown in FIGS. 3 to 9, even when the positions of the caulking punches P <b> 1 and P <b> 2 are displaced in the axial direction of the sleeve 21, the displacement of the adjuster 25 is at most the clearance between the female screw 26 and the male screw 27. Since it is suppressed to ½, the amount of deviation can be suppressed to ½ or less compared to the prior art in which the adjuster is fixed only by one caulking portion.

(3) Since the shift amount of the adjuster 25 is reduced and the spring load can be correctly held at the set value, the accuracy of the current-hydraulic characteristics can be improved.

(4) As shown in FIG. 13, by adjusting the tightening amount of the screw of the adjuster 25, the characteristics of the current and hydraulic pressure output values move up and down in the graph. Further, the current-hydraulic characteristic moves up and down in the graph even when the adjuster 25 is moved by the caulking process and the spring load is changed. On the other hand, the standard of the spool solenoid valve requires that the current-hydraulic characteristics fall within a certain range. However, if there is a deviation amount of the adjuster 25, it is necessary to keep the current-hydraulic characteristics within a certain range in consideration of the deviation amount, and the tolerance for the standard is reduced by the deviation amount, and the current-hydraulic characteristics. Adjustment becomes difficult. According to the present embodiment, since the shift amount of the adjuster is suppressed, the allowable amount with respect to the standard can be increased, and the adjustment becomes easy.

[2. Second Embodiment]
A second embodiment will be described with reference to FIG. In the present embodiment, a male screw 27 is provided on the outer periphery of the end portion of the sleeve 21 opposite to the drive unit 10. The adjuster 25 has a bottomed cylindrical shape and is provided with a female screw 26 on the inner periphery thereof. The adjuster 25 is fitted over the end portion of the sleeve 21, and the female screw 26 and the male screw 27 of the sleeve 21 are screwed together.

  The end of the coil spring 24 is in contact with the inner surface of the adjuster 25, and the adjuster 25 is fastened to the sleeve, whereby the pressing force against the coil spring 24 is changed and the load of the coil spring is adjusted. The plurality of caulking portions 30a and 30b are formed by driving caulking punches P1 and P2 having a plurality of pressing portions from the outer periphery of the adjuster 25. About the space | interval of the crimping parts 30a and 30b and other structures, it is the same as that of 1st Embodiment.

  Also in this embodiment, the same effect as 1st Embodiment can be acquired. Further, by providing anti-slip such as knurling on the surface of the adjuster 25, it is possible to adjust the spring load by rotating the adjuster 25 without using a tool.

[3. Third Embodiment]
A third embodiment will be described with reference to FIG. In the present embodiment, the positions of the caulking portion 30 a and the caulking portion 30 b are shifted in the circumferential direction of the sleeve 21. That is, two caulking punches P1 and P2 are arranged on the opposite side across the sleeve 21, and the caulking portions 30a and 30b are formed by pressurizing the sleeve 21 with the two caulking punches P1 and P2. It is. The axial interval is 1.5 times the screw pitch interval, as in the first embodiment.

  Also in this embodiment, the same effect as 1st Embodiment can be acquired. Further, according to the present embodiment, small caulking punches are arranged in different directions when the space for arranging caulking punches constituting the caulking portions 30a and 30b is small at the same circumferential position of the sleeve 21. Thus, a plurality of caulking portions can be formed. Further, by providing the crimped portions 30a and 30b from the opposite sides of the sleeve 21 in the circumferential direction, the adjuster 25 can be sandwiched and positioned from both sides, and there is an effect of improving the fixing strength of the adjuster 25 and preventing misalignment.

  FIG. 15B shows a set of a plurality of caulking portions 30a and 30b that press the screw thread from both sides, and the caulking portions of each set are arranged around the sleeve 21 and the adjuster 25 (for example, 180 degrees opposite to each other). On the side). In this case, a plurality of sets of caulking portions can be provided on the sleeve 21 by providing two caulking punches P1 and P2 on each surface of the sleeve. In this case, the adjuster 25 can be positioned more reliably than in FIG.

[4. Other Embodiments]
The present invention is not limited to the above embodiment. The above embodiments are presented as examples, and can be implemented in various other forms. Various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope, gist and equivalent range of the invention. An example is shown below.

(1) In the illustrated embodiment, the present invention is applied as a spring load adjusting device for an electromagnetic spool valve. However, the present invention is not limited to this type of electromagnetic valve, and other types of electromagnetic valves are also applicable. It can be used. Further, the present invention is not limited to the electromagnetic valve, and can be applied to any apparatus that needs to be fixed so that the adjustment amount does not deviate after adjusting the spring load.

(2) The interval between the plurality of caulking portions is not limited to 1.5 times the pitch of the screw thread, and the pressing force by the plurality of caulking portions is different even when the interval is an integral multiple, for example, 3 or 4.5 times. It is possible to press the slope of the thread inclined in the direction. However, except for an integral multiple of 1.5 times, depending on the positional relationship between the plurality of crimped portions and the thread, the plurality of crimped portions may press the slope of the thread that is inclined in the same direction. In such a case, the shift of the adjuster is not offset. However, when the position of the screw thread and the position of the caulking part, that is, the caulking punch can be always applied to an accurate position, the plural caulking parts press the inclined surface of the thread inclined in different directions. By selecting the location and performing the caulking process, the position shift of the adjuster can be offset.

(3) There may be three or more caulking parts. However, if the number of the caulking parts is an odd number, the number of threads pressed by the caulking part is not equal in the loosening direction and the tightening direction of the spring load. There is a risk that the force of the larger one will be superior and displacement will occur. Therefore, even numbers are more preferable.

(4) In addition to the coil spring, a U-shaped spring, a torsion coil spring, and a bamboo spring can be used as the spring. In addition to metal, a resin spring or a spring made of a block-like elastic body can also be used.

(5) A concave portion that prevents the mark or the tip of the punch from being displaced can be formed on the outer periphery of the sleeve in accordance with the position of the caulking punch. If it does in this way, a plurality of caulking parts can always be formed correctly and adjustment of a spring load can be carried out more accurately.

(6) It is preferable to form the plurality of crimping portions simultaneously with a jig such as a crimping punch, but the crimping portions may be formed one by one. That is, even if the adjuster is displaced along the slope of the thread due to the pressing force at the time of forming the first caulking portion, the adjuster is pressed to the opposite side by the pressing force at the time of forming the next caulking portion. The misalignment is corrected. However, the adjuster may be moved too much due to the pressing of the first caulking portion, and may not be moved to the opposite side by the next caulking portion, which is not preferable depending on the position of the caulking portion.

(7) The deformation of the thread by the caulking portion may be such that only the thread of either the adjuster or the sleeve is crushed, but the tip of one thread is biting into the surface of the other thread. Both screw threads may be deformed. Further, only the thread of the desired member may be deformed by changing the strength of the material of the adjuster and the sleeve.

DESCRIPTION OF SYMBOLS 10 ... Drive part, 11 ... Housing, 12 ... Coil, 13 ... Resin layer, 14 ... Core, 15 ... Plunger, 16 ... Pin, 20 ... Nozzle, 21 ... Sleeve, 21a, 21b, 21c ... Port, 22 ... Spool valve 22a, 22b, 22c ... valve part, 23 ... recess, 24 ... coil spring, 25 ... adjuster, 26 ... female screw, 27 ... male screw, 28 ... concave part, 29 ... groove, 30a, 30b ... caulking part, P1, P2 ... a caulking punch.

Claims (9)

A sleeve having a hollow portion extending in the axial direction;
A pressed member housed inside the sleeve;
An adjuster provided to be movable in the axial direction of the sleeve with respect to the end of the sleeve;
A sleeve side screw provided in the sleeve;
An adjuster side screw provided on the adjuster;
The sleeve is accommodated between the pressed member and the adjuster inside the sleeve, and is pressed toward the pressed member in accordance with the axial movement of the adjuster by tightening the sleeve side screw and the adjuster side screw. Springs,
A plurality of caulking portions that are pressurized from the outer periphery of the sleeve toward the central axis and deform at least one of the sleeve side screw and the adjuster side screw ;
The sleeve side screw and the adjuster side screw are screwed together,
The plurality of crimping portions are provided at predetermined intervals along the axial direction of the sleeve, the plurality of crimping portions are provided at the same circumferential position, and the pressing force by the plurality of crimping portions is A spring load adjusting device that presses a slope of a screw thread inclined in a different direction in the screw.   2. The spring load adjusting device according to claim 1, wherein the plurality of caulking portions are arranged at a distance that is an integral multiple of 1.5 times the pitch of the thread in the axial direction of the sleeve.    3. The spring load adjusting device according to claim 1, wherein the plurality of caulking portions are provided at two locations and are 1.5 times the pitch of the thread.    The spring load adjusting device according to any one of claims 1 to 3, wherein the spring is a coil spring. The spring load adjusting device according to any one of claims 1 to 4, wherein the sleeve side screw is provided on an inner surface of the hollow portion of the sleeve, and the adjuster side screw is provided on an outer peripheral surface of the adjuster. A cylindrical portion is provided in a part of the adjuster, and an end portion of the sleeve is accommodated inside the cylindrical portion,
The spring load adjusting device according to any one of claims 1 to 4, wherein the sleeve side screw is provided on an outer peripheral surface of an end portion of the sleeve, and the adjuster side screw is provided on an inner surface of the adjuster. The sleeve is a body of a solenoid valve;
The pressed member is a spool valve of an electromagnetic valve;
An electromagnetic solenoid having a plunger that contacts the one end side of the spool valve is fixed to the proximal end side in the axial direction of the sleeve,
The spring load adjusting device according to any one of claims 1 to 6, wherein the spring, an adjuster, a screw portion, and a caulking portion are provided on a distal end side in the axial direction of the sleeve. Inserting a pressed member into the sleeve having a hollow portion extending in the axial direction;
Inserting a spring into the sleeve and abutting one end thereof against the end of the pressed member;
Attaching an adjuster to the end of the sleeve so as to be axially movable;
The screws provided on the sleeve and the adjuster and screwed to each other are tightened, the adjuster is moved along the axial direction of the sleeve, the spring is pressed toward the pressed member, and the covered Adjusting the spring pressure applied to the pressing member;
A plurality of caulking portions provided at predetermined intervals along the axial direction of the sleeve, wherein the plurality of caulking portions provided at the same circumferential position are inclined in different directions in the screw. Applying pressure so as to press the inclined surface, and deforming at least one thread of the sleeve side screw and the adjuster side screw;
A spring load adjustment method comprising:   The spring load adjusting method according to claim 8, wherein the plurality of caulking portions are arranged with a distance that is an integral multiple of 1.5 times the pitch of the thread in the axial direction of the sleeve.