JP2004274829A - Electromagnet coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To arrange a coil block with no rattling, without requirement for extremely higher dimensional precision of each component. <P>SOLUTION: Related to a electromagnet coil 1, a coil block 26 is assembled in a block body 28 of a yoke 27, and an inside pole-teeth ring 29 is press-fitted to the block body 28 so that the front side of the coil block 26 is suppressed. A gelatinous liniment 40 which is elastic when cured is filled between the front surface of the coil block 26 and the inside pole-teeth ring 29. In this configuration, the gelatinous liniment 40 is surely filled in the gap between the coil block 26 and the inside pole-teeth ring 29, and the elasticity after curing suppresses rattling of the coil block 26. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The invention of this application relates to an electromagnetic coil used for an electromagnetic brake or the like.
[0002]
[Prior art]
BACKGROUND ART An electromagnetic brake (hysteresis brake) using a hysteresis material is known as disclosed in Patent Document 1.
[0003]
The electromagnetic brake includes a pair of pole teeth rings opposed to each other in a radial direction, and a cylindrical hysteresis ring interposed in a non-contact state between the pair of pole teeth rings. Are provided integrally with the yoke of the electromagnetic coil, and the hysteresis ring is integrally attached to the rotating member. When a magnetic field is generated between opposing pole teeth by energization of the electromagnetic coil, the electromagnetic brake generates a braking force due to a difference between the direction of the magnetic field between the pole teeth and the direction of the magnetic flux in the hysteresis ring.
[0004]
In the electromagnetic coil used here, a coil block having a coil winding as a main element is housed in a yoke. It is formed separately. That is, the body block of the yoke is provided with a coil block accommodating portion and a pole tooth ring fitting / fixing portion. After the coil block is accommodated in the main body block, the front surface of the coil block is pressed down so that the pole teeth are pressed. The ring is fitted and fixed. However, the abutment wall is provided on the main body block, and the fitting position of the polar tooth ring is regulated by abutting the abutment wall.
[0005]
[Patent Document]
Patent Registration No. 2862050 [0006]
[Problems to be solved by the invention]
However, the electromagnetic coil used in the electromagnetic brake or the like has a strict positional relationship between the coil block and the yoke block when another yoke block (in the above example, a pole tooth ring) is attached to the main body block of the yoke. If the fitting depth of the yoke block is too deep, the coil block will be deformed by the yoke block. Conversely, if the fitting depth is too shallow, the coil block will be loose after assembly. Would. For this reason, in the conventional electromagnetic coil, it is necessary to increase the dimensional accuracy of each part of the member in order to strictly manage the mutual positional relationship, which causes a problem that the manufacturing cost rises. I have.
[0007]
Therefore, the invention of this application is to provide an electromagnetic coil in which the coil block can be arranged in the yoke without rattling without extremely increasing the dimensional accuracy of each part of the member.
[0008]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, the invention of this application is based on a first yoke block capable of accommodating a coil block, and a position fixed so that a front surface of the coil block is pressed into the first yoke block. And a second yoke block, wherein a gel coating material having elasticity at the time of curing is interposed between the coil block and the second yoke block.
[0009]
In the case of the present invention, the gel coating agent interposed between the coil block and the second yoke block surely fills the gap between the two and has elasticity when hardened. Can be reliably suppressed. Further, since the gel coating material has elasticity after curing, it can absorb expansion and contraction of members caused by heat generation of the coil block and the like. Therefore, according to the present invention, the rattling of the coil block can be surely eliminated without increasing the manufacturing cost.
[0010]
Further, unlike the case where a spring material such as a disc spring is interposed between the coil block and the second yoke block, the present invention does not require a large intervening space because the gel-like coating material spreads appropriately at the time of filling. There is no need to control the spring load. Then, at the time of assembling, at least one of the coil block and the second yoke block only needs to be coated with the gel-like coating agent.
[0011]
It is preferable that the first yoke block is provided with a restricting means for restricting a mounting position of the second yoke block to a position where the second yoke block does not directly contact the coil block. In this case, it is possible to prevent a problem that the second yoke block deforms the coil block when the second yoke block is mounted, and to secure a space for filling the coating material between the coil block and the second yoke block. Can be.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the invention of this application will be described based on the drawings.
[0013]
In this embodiment, an electromagnetic coil 1 according to the invention of this application is applied to a hysteresis brake 2 for driving and controlling a valve timing control device of an internal combustion engine. Hereinafter, the overall configuration of the valve timing control device according to the present embodiment will be described. It is assumed that the valve timing control device is applied to a valve train on the intake side of an internal combustion engine.
[0014]
As shown in FIG. 1, the valve timing control device includes a driven shaft member 3 (driven rotating body) coupled to a front end of a camshaft (not shown) on the intake side of the internal combustion engine, and the driven shaft member 3 And a drive ring 5 (drive rotator) having a timing sprocket 4 on its outer periphery which is attached to the crankshaft (not shown) via a chain (not shown) so as to be relatively rotatable in accordance with An assembling angle operating means 6 disposed on the front side (left side in FIG. 1) of the driving ring 5 to relatively rotate the driving ring 5 and the driven shaft member 3 to operate the assembling angle of the both, and the assembling angle Operating force applying means 7 for applying an operating force to the operating means 6.
[0015]
The drive ring 5 is formed in a substantially disk shape having a stepped insertion hole 8, and the insertion hole 8 is rotatably assembled to the driven shaft member 3. As shown in FIGS. 2 and 3, three radial grooves 9 (radial guides) having parallel side walls facing each other are formed on the front surface of the drive ring 5 (the surface opposite to the camshaft). 5 is formed substantially along the radial direction. In the case of this embodiment, the drive ring 5 is configured by combining two members.
[0016]
As shown in FIG. 1, the driven shaft member 3 has an enlarged diameter portion formed on an outer periphery of a base portion which is abutted against a front end portion of the camshaft, and has an outer peripheral surface on a forward side of the enlarged diameter portion. Three levers 10 projecting radially are integrally formed and connected to the camshaft by bolts 11 penetrating the shaft core. A base end of a link 12 is pivotally connected to each lever 10 by a pin 13, and a column-shaped projection 14 slidably engaged with each of the radial grooves 9 is integrally formed at a distal end of each link 12. Is formed.
[0017]
Each link 12 is connected to the driven shaft member 3 via the pin 13 in a state where the protrusions 14 are engaged with the corresponding radial grooves 9. When displaced along 9, the drive ring 5 and the driven shaft member 3 rotate relative to each other by the action of the link 12 in a direction and an angle corresponding to the displacement of the projection 14.
[0018]
A receiving hole 15 is formed at the distal end of each link 12 and opens forward in the axial direction. The receiving hole 15 has an engaging pin 17 that engages with a spiral groove 16 (a spiral guide) described later. And a coil spring 18 for urging the engagement pin 17 forward (toward the spiral groove 16). In the case of this embodiment, a movable guide portion that can be displaced in the radial direction is configured by the projecting portion 14 at the distal end of the link 12, the engagement pin 17, the coil spring 18, and the like.
[0019]
On the other hand, an intermediate rotating body 19 having a disk-shaped flange wall is rotatably supported via a bearing 20 in front of the driven shaft member 3 with respect to the projecting position of the lever 10. The above-mentioned spiral groove 16 having a semicircular cross section is formed on the rear surface side of the flange wall of the intermediate rotating body 19, and the engaging pin 17 at the tip of each link 12 is guided in the spiral groove 16 in a freely rolling manner. Is engaged. The spiral of the spiral groove 16 is formed so that the diameter gradually decreases along the engine rotation direction R. Therefore, when the intermediate rotating body 19 relatively rotates in the delay direction with respect to the drive ring 5 in a state in which the engagement pin 17 at the tip of each link 12 is engaged with the spiral groove 16, the tip of the link 12 becomes the radial groove 9. While being guided by the spiral shape of the spiral groove 16 and moving radially inward, conversely, when the intermediate rotating body 19 is relatively displaced in the advancing direction, it moves radially outward.
[0020]
The assembling angle operating means 6 includes the radial groove 9, the link 12, the projecting portion 14, the engaging pin 17, the lever 10, the intermediate rotating body 19, the spiral groove 16 and the like of the drive ring 5 described above. The assembling angle operating means 6 is configured such that when a relative rotational operating force with respect to the drive ring 5 is input to the intermediate rotating body 19 from an operating force applying means 7 described later, the operating force is applied to the spiral groove 16 and the engaging pin. The distal end of the link 12 is displaced in the radial direction through the engaging portion 17, and at this time, the link 12 swings, and the drive ring 5 and the driven shaft member 3 are relatively rotated according to the swing amount.
[0021]
On the other hand, the operating force applying means 7 includes a mainspring 21 serving as an urging means for urging the intermediate rotating body 19 against the drive ring 5 in the engine rotation direction R, and an A hysteresis brake 2 as an electromagnetic brake that operates in a direction opposite to the rotation direction R. The intermediate rotating body 19 is rotated by the balance between the biasing force of the mainspring spring 21 and the operating force of the hysteresis brake 2. ing.
[0022]
The spring 21 has an outer peripheral end coupled to a cylindrical member 22 fixed to the drive ring 5, and an inner peripheral end coupled to a cylindrical base of the intermediate rotating body 19.
[0023]
The hysteresis brake 2 includes an electromagnetic coil 1 supported and fixed to a VTC cover (not shown), which is a non-rotating member, and a braking force receiving portion 23 that receives a braking force generated by a magnetic field generated by the electromagnetic coil 1. 23 is connected to the intermediate rotating body 19 via a rubber bush 24 and a connecting pin 25.
[0024]
The electromagnetic coil 1 has a coil block 26 having a coil winding that generates a magnetic field when energized as a main element, and a yoke 27 that is arranged around the coil block 26 and induces magnetic flux. As shown in FIG. 4, the main body block 28 includes an inner polar ring 29 and an outer polar ring 30 fitted and fixed to the main block 28. In the case of this embodiment, the main body block 28 constitutes a first yoke block in the present invention, and the inner pole ring 29 constitutes a second yoke block. The inner polar tooth ring 29 and the outer polar ring 30 are concentrically arranged with an annular gap, and a plurality of axially extending tooth surfaces are formed on the opposing surfaces along the circumferential direction. Have been. The tooth surfaces of the bipolar tooth rings 29 and 30 are arranged offset from each other in the circumferential direction, and when the coil winding of the coil block 26 is energized, the offset positional relationship between the rings 29 and 30 is established. , A magnetic field directed toward the mating tooth surface is generated.
[0025]
The braking force receiving portion 23 has a cylindrical hysteresis ring 31 inserted and disposed between the bipolar tooth rings 29 and 30 in a non-contact state, and the outer peripheral end is integrally connected to the hysteresis ring 31. A disk-shaped plate member 33 having a shaft portion 32 connected to an inner peripheral end thereof. The shaft portion 32 connected to the plate member 33 is rotatably mounted on the main body block 28 of the yoke 27 via a bearing 34. While being supported, the inner peripheral edge of the plate member 33 is connected to the intermediate rotating body 19 via the rubber bush 24 and the connecting pin 25.
[0026]
The hysteresis ring 31 is made of a hysteresis material having a magnetic hysteresis characteristic. When a magnetic field is generated between the bipolar tooth rings 29 and 30 during rotation of the hysteresis ring 31, the direction of the magnetic field and the direction of the magnetic flux in the hysteresis ring 31 are changed. Is shifted. The hysteresis brake 2 generates a braking force due to this shift.
[0027]
Here, the structure of the electromagnetic coil 1 will be described in detail. The main body block 28 of the yoke 27 is formed by extending a boss portion 36 on a disk-shaped base wall 35, and the boss portion 36 is provided with an annular coil block 26. After the inner polar teeth ring 29 and the inner polar teeth ring 29 are sequentially assembled, the proximal end of the outer polar teeth ring 30 is press-fitted and fixed to the outer periphery of the base wall 35. In the figure, reference numeral 37 denotes a current-carrying socket portion extending from the coil block 26, and this socket portion 37 protrudes outside through a through hole 38 of the main body block 28.
[0028]
The inner pole ring 29 is fixed to the boss portion 36 of the main body block 28 by press-fitting, and the boss portion 36 is provided with a stepped surface 39 so as to reduce the diameter of the distal end side as shown in FIG. The tip of the inner pole tooth ring 29 is abutted against the step surface 39. The step surface 39 constitutes a restricting means for restricting the press-fitting position of the inner pole ring 29 as the second yoke block. The distance L ₁ from the base portion side of the boss portion 36 to the stepped surface 39 is slightly greater than the axial length L ₂ of the coil block 26. Therefore, when assembling the inner polar tooth ring 29, a slight gap is formed between the front surface of the coil block 26 and the inner polar tooth ring 29, but this gap is mainly composed of silicon and has an adhesive gel coating. The agent 40 is filled. The gel coating material 40 has elasticity after hardening, and functions so that the end of the coil block 26 is always elastically supported by the inner pole ring 29.
[0029]
When assembling the coil block 26 and the inner pole ring 29 to the main body block 28, first, as shown in FIGS. 6A and 6B, the coil block 26 is fitted to the boss 36 of the main body block 28. Thereafter, as shown in FIG. 6C, a gel coating material 40 is applied to the front surface of the coil block 26 so as to swell. Then, as shown in FIG. 6D, the inner pole tooth ring 29 is press-fitted into the boss portion 36 until the tip of the ring 29 abuts on the step surface 39. When the inner polar tooth ring 29 is press-fitted in this way, the gel coating material 40 is pushed and spread into the gap between the coil block 26 and the inner polar tooth ring 29. At this time, since the outer peripheral sides of the coil block 26 and the inner pole ring 29 are open to the outside, this portion forms a passage for venting air, and the gel-like coating agent is filled in the gap (in the filling space). A close packing of 40 is possible.
[0030]
Since this valve timing control device is configured as described above, when changing the rotation phase of the crankshaft and the camshaft (opening / closing timing of the engine valve) to the most advanced side, an appropriate current is supplied to the hysteresis brake 2. Accordingly, a braking force against the force of the mainspring 21 is transmitted from the plate member 33 to the intermediate rotating body 19 via the rubber bush 24 and the connecting pin 25. As a result, the intermediate rotating body 19 rotates in the opposite direction with respect to the drive ring 5, whereby the engaging pin 17 at the tip of the link 12 is guided to the spiral groove 16, and the tip of the link 12 is displaced radially inward. At this time, as shown in FIG. 3, the operation angle of the link 12 changes the assembly angle between the drive ring 5 and the driven shaft member 3 to the most advanced position.
[0031]
When the rotation phase of the crankshaft and the camshaft (opening / closing timing of the engine valve) is changed to the most retarded side, the energizing current of the hysteresis brake 2 is turned off or weakened, so that the intermediate rotating body 19 is rotated. It is rotated in the engine rotation direction by the force of the spring 21. Then, the leading end of the link 12 is displaced radially outward by the guide of the engaging pin 17 by the spiral groove 16, and at this time, the combination of the drive ring 5 and the driven shaft member 3 by the action of the link 12 as shown in FIG. The angle is changed to the most retarded position.
[0032]
Incidentally, in the electromagnetic coil 1 employed in this valve timing control device, the gel coating material 40 is densely interposed between the coil block 26 attached to the main body block 28 of the yoke 27 and the inner pole ring 29. Therefore, the coil block 26 is reliably supported by the inner pole teeth ring 29, and the backlash of the ring 29 is suppressed. Moreover, in the electromagnetic coil 1, the amount of press-fit of the inner pole tooth ring 29 into the main body block 28 is regulated by the step surface 39 of the boss portion 36, so that the inner pole tooth ring 29 can be reliably inserted between the coil block 26 and the inner pole tooth ring 29. Since the separation width is ensured, there is no problem that the coil block 26 is deformed at the time of press-fitting the inner pole tooth ring 29, and the filling volume of the gel coating material 40 can be reliably ensured.
[0033]
Further, since the gel coating material 40 filled between the coil block 26 and the inner pole ring 29 has elasticity after curing, the elasticity can surely absorb the vibration of the coil block 26, and the hysteresis ring can be absorbed. It is also possible to absorb expansion and contraction of members due to heat generated in the coil 31 and the coil block 26. Therefore, there is no problem that the gel-like coating material 40 is peeled off from the coil block 26 or the inner pole ring 29 due to use over time. Further, in the case of this embodiment, since the gel coating material 40 has adhesiveness, not only the fluctuation in the axial direction of the coil block 26 but also the vibration in the radial direction and the rotation direction can be suppressed.
[0034]
Furthermore, in the case of the electromagnetic coil 1, compared with the case where a spring material such as a disc spring is interposed between the coil block 26 and the inner pole ring 29, a large intervening space is not required and the spring load needs to be controlled. There is no advantage. In other words, if the gel coating agent 40 is only applied to the front surface of the coil block 26 with an appropriate volume at the time of assembly, the coating agent 40 spreads to fill the gap by press-fitting the inner pole ring 29, and after curing, In this case, the coating material 40 elastically supports the coil block 26 in a small filling space. Further, at the time of assembling, it is only necessary to apply the gel-like coating agent 40 to at least one of the coil block 26 and the inner pole ring 29, so that the assembling workability is also very good.
[0035]
Next, inventions other than those described in the claims that can be understood from the above embodiments will be described below together with their operational effects.
[0036]
(A) The passage according to claim 1 or 2, wherein when the coil block and the second yoke block are fitted and fixed, a passage communicating between the space filled with the gel coating agent between the two blocks and the outside is provided. Electromagnetic coil.
[0037]
In this case, when the gel coating material is applied and the coil block and the second yoke block are fitted and fixed, the air in the space filled with the gel coating material is reliably discharged to the outside through the passage. The filling space can be filled almost without gaps.
[0038]
(2) The electromagnetic coil according to any one of (1) and (2), wherein the second yoke block is press-fitted and fixed to the first yoke block.
[0039]
In this case, the position of the second yoke block and the first yoke block can be easily fixed, and the gel coating material can be surely spread into the filling space at the time of press-fitting and fixing.
[0040]
(3) The electromagnetic coil according to any one of (1) and (2), wherein the electromagnetic coil is used for a hysteresis brake.
[0041]
In this case, it is possible to reliably prevent the coil block from being separated from the surrounding members due to expansion and contraction of the member caused by the heat generated by the hysteresis material.
[0042]
(D) The electromagnetic coil according to any one of (1) to (2), wherein the gel coating agent has adhesiveness.
[0043]
In this case, rattling of the coil block can be more reliably prevented.
[0044]
(E) The electromagnetic coil according to any one of (1) to (2), wherein the gel-like coating material is a coating material containing silicon as a main component.
[0045]
In this case, the characteristics of the coating material are unlikely to change due to heat generated by the coil block and the like, and there is no problem that the coating material corrodes surrounding metal materials.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is an exemplary sectional view of the same embodiment taken along line AA of FIG. 1;
FIG. 3 is an exemplary sectional view corresponding to FIG. 2 showing an operation state of the embodiment;
FIG. 4 is an exploded perspective view showing the same embodiment.
FIG. 5 is an enlarged exploded perspective view showing the same embodiment; FIG. 6 is a sectional view showing an assembling process of the same embodiment;
[Explanation of symbols]
1. Electromagnetic coil 26 ... Coil block 27 ... Yoke 28 ... Body block (first yoke block)
29 ... Inner pole ring (second yoke block)
39: step surface (restriction means)
40 ... Gel coating agent

Claims (2)

It has a coil block that generates a magnetic field when energized, and a yoke that forms a magnetic flux path. The yoke has a first yoke block that can accommodate the coil block, and the first yoke block has a front surface of the coil block. A second yoke block fixed in position so as to hold it down.
An electromagnetic coil, wherein a gel-like coating material having elasticity upon curing is interposed between the coil block and the second yoke block. 2. The electromagnetic coil according to claim 1, wherein the first yoke block is provided with a restriction unit that restricts a mounting position of the second yoke block to a position where the second yoke block does not directly contact the coil block. 3.

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