JP2010258216A - Roller contact device for tap selector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability of a roller contact device by avoiding the situation in which a base portion of a roller shaft collides with a storage hole of a body fixed to an insulating rotary shaft each time a tap is switched. <P>SOLUTION: The roller contact device 5 for a tap selector switches a tap while maintaining a vertically symmetrical structure which is always constant, wherein a roller shaft 12 is projected radially from the body 11 fixed to the insulating rotary shaft 1 to support a roller by the roller shaft, pressers and leaf springs 16 are arranged in order outside above and below upper and lower rollers to hold a contact by the upper and lower rollers, and respective contacts are held with holding force of upper and lower leaf springs. A lock hole 38 is provided on the tip side of the leaf spring and a lock pin 37 is projected on the presser, so that movements of the roller in a circumferential direction around and a centrifugal direction from the insulating rotary shaft 1 as the center are restrained by the leaf spring through an engagement structure between the lock hole and lock pin. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a roller contact device used for a tap selector of a load tap changer that is a component of a transformer or a voltage regulator.

  As the tap selector described above, the following is known (Patent Document 1). As shown in FIG. 11, a current collecting contact 82, a tap switching support contact 83, and a fixed contact 84 are arranged in this order from the center of the insulated rotating shaft 81 toward the outside. Among these, the current collecting contact 82 on the inner peripheral side is a ring-shaped portion of a P-shaped flat plate as shown in FIG. 12, and a tap switching support contact 83 is integrally continuous on the outer periphery thereof. The tap switching support contact 83 is provided with a plurality of switching support contact main body portions 83a and thin non-contact portions 83b alternately along the circumferential direction. And the stationary contact 84 is provided in the circumferential direction vicinity at the outer periphery vicinity of each non-contact part 83b.

  Further, as shown in FIG. 11, a roller contact device 85 capable of sandwiching each of these contacts is fixed to the insulated rotating shaft 81. The roller contact device 85 has a vertically symmetrical structure, and holds the upper and lower rollers 86 that sandwich each contact from above and below. Each roller 86 is rotatably supported by a roller shaft 87 inserted through the center thereof. The roller shaft 87 extends radially from the insulated rotating shaft 81 side, and the base of the roller shaft 87 is housed in the housing hole 88 a of the body 88 fixed to the insulated rotating shaft 81. A pressing tool 89 is fixed to an intermediate portion of the upper roller shaft 87, and the pressing tool 89 covers the upper side of the roller 86. A fitting groove 89a is formed on the upper surface of the upper pressurizing tool along a tangential direction of a circle centering on the axis of the insulated rotating shaft, and the tip of the upper leaf spring 91 is bent in the fitting groove 89a. It is inserted. On the other hand, the base portion of the upper leaf spring 91 is fixed to the body 88. The upper and lower pressurizing tools 89 are restrained from above and below by the plate springs 91, respectively, so that the upper and lower rollers 86 sandwich the contact points.

  Each roller 86 has contact portions 92, 93, 94 for current collecting contacts, tap switching support contacts, and fixed contacts. The diameters of the respective contact portions are formed so as to have a size relationship of fixed contact contact portion 94> tap switching support contact contact portion 93> collecting contact contact portion 92. On the other hand, the thickness of each contact sandwiched between the upper and lower contact portions is formed so that the fixed contact 84 <the support contact main body portion 83a <the current collecting contact 82. At the time of tap switching, the roller contact device 85 rotates together with the insulated rotating shaft 81. By such a magnitude relationship, at least two contact points are always sandwiched between the upper and lower rollers 86, and the upper and lower rollers 86 are in a parallel state. The tap is switched while maintaining

JP 2007-115919 A

  By the way, when the insulating rotating shaft 81 is rotated clockwise, for example, when the tap is switched, counterclockwise force and centrifugal force are applied to the roller 86 from the contact point. Since the roller 86, the roller shaft 87, and the pressure tool 89 constitute an integrated roller assembly, the force applied to the roller 86 is applied to the entire roller assembly. For this reason, the roller assembly tends to move in the centrifugal direction due to the centrifugal force. However, as shown in FIG. 13, the fitting structure between the distal end portion of the leaf spring 91 and the fitting groove 89a of the pressurizing tool 89 moves the movement. Stop.

  On the other hand, the tip of the roller shaft 87 tends to move counterclockwise due to the counterclockwise force. The counterclockwise movement cannot be prevented by the above-described fitting structure between the leaf spring 91 and the pressurizing tool 89, but is prevented by the fitting structure between the roller shaft 87 and the accommodation hole 88a. In other words, when the tip portion of the roller shaft 87 tries to move counterclockwise, the base portion of the roller shaft 87 collides with the receiving hole 88a on the entrance side and the back side, and a pressing force in a reverse direction acts on each of the collision portions. While preventing the counterclockwise movement.

  A clockwise force that prevents counterclockwise movement is applied to the entrance-side collision point. The closer the distance r between the collision location and the center of rotation of the insulated rotating shaft 81, the greater the force applied to the collision location due to the law of moment, and the roller shaft 87 and the receiving hole 88a collide each time the tap is switched. It becomes easy to do. As a result, the fitting state between the base of the roller shaft 87 and the accommodation hole 88a gradually becomes unstable, and the roller 86 comes into contact with each contact at a position away from the ideal position. Therefore, there is a point that should be improved in terms of reliability.

  The present invention has been made in view of the above circumstances, and its purpose is to avoid a situation in which the base portion of the roller shaft collides with the receiving hole every time the tap is switched, and to improve the reliability of the roller contact device. .

  Claim 1 of the present invention is premised on a roller contact device for a tap selector having the following two conditions. That is, the ring-shaped current collecting contact, the plurality of tap switching support contacts, and the plurality of fixed contacts that sequentially surround the outer periphery of the rotating shaft around the insulated rotating shaft, while maintaining a constant vertical symmetry structure, In order to enable clamping between the upper and lower rollers, each roller is provided with a current collecting contact contact portion, a tap switching support contact contact portion, and a fixed contact contact portion. In the tap switching state, when the selected fixed contact is in the tap switching state, the first contact point is a roller contact device for a tap selector that temporarily holds the above-described three contacts with the upper and lower rollers. This is the condition.

  Then, an accommodation hole is opened on the upper side of the body of the vertically symmetrical structure fixed to the insulating rotation shaft, the base portion of the roller shaft is accommodated in the accommodation hole, and the tip portion of the roller shaft is extended toward the fixed contact, The roller is rotatably supported on the tip of the roller shaft, and the base of the pressurizing tool that applies a downward contact pressure to the roller is fixed to the intermediate portion of the roller shaft, and the current collecting contact contact portion is changed to the fixed contact contact portion. Cover the upper range up to the middle with the tip of the pressurizing tool, fix the base of the leaf spring that presses the pressurizing tool to the upper surface of the body, and keep the tip of the leaf spring along the top of the pressurizing tool By engaging, the movement of the roller in the centrifugal direction is restrained, and the pressurizing point to the pressurizing tool by the leaf spring is such that the contact point of the collector contact point to the collector contact point and the contact point of the fixed contact point Roller controller for tap selector located directly above the midpoint of the straight line connecting the contact point to the fixed contact It is a second condition which is transfected device.

  A locking hole is provided on the front side of the leaf spring, and a locking pin is provided on the pressurizing tool. A fitting structure of the locking hole and the locking pin provides a circle around the insulating rotation shaft. A plate spring restrains the movement of the roller in the circumferential direction.

  The engagement structure of the locking pin and the locking hole is such that the leaf spring restrains the movement of the roller in the circumferential direction around the insulated rotating shaft. Of these, the shape may be at least along the circumferential direction. For example, the locking pin may be formed in a circular shape in plan view and the locking hole may be a long hole extending in the centrifugal direction. In this case, in order to restrain the movement of the roller in the centrifugal direction, For example, the tip of the leaf spring is bent and fitted into the fitting groove of the pressurizing tool. However, in this case, the fitting structure between the fitting groove of the pressurizing tool and the tip of the leaf spring not only serves to restrain the movement of the roller in the centrifugal direction but also serves as a pressing point. And wear increases.

  However, if the structure that constrains the movement of the roller and the structure of the pressure point are clearly separated, the wear of the pressure point can be suppressed, and the structure can be freely designed according to its role. It can also contribute to improvement. That is, as in the invention of claim 2, the leaf spring restrains the movement of the roller in the circumferential direction and the centrifugal direction around the insulating rotation shaft by the fitting structure of the locking hole and the locking pin. desirable.

  Such a fitting structure is a structure in which a locking hole extends along the entire periphery of the locking pin. For example, a relationship between a circular locking pin in a plan view and a circular locking hole in a plan view that fits in the locking pin with play. Is common.

  In addition, if the roller contact device is not considered to be compact in the vertical width, the pressurizing tool may be extended to a position far from the pressurizing point in the centrifugal direction. You may provide a joint position in the position of a pressurization point, or the position away from an insulated rotating shaft rather than a pressurization point. However, considering the downsizing of the roller contact device, the fitting position is preferably close to the rotation center of the roller contact device. That is, the engagement position between the locking hole and the locking pin is provided on the insulating rotating shaft side from the pressing point applied to the pressing tool by the leaf spring.

  Furthermore, if the leaf spring restrains the movement of the roller by the fitting structure with the locking hole and the locking pin, the structure of the pressing point can be freely set. The reliability is improved in a simple structure than in a structure in which the distal end portion of the leaf spring is bent and fitted in the fitting groove of the pressurizing tool. For this purpose, as in the invention of claim 3, the pressurizing point to the pressurizing tool by the leaf spring is formed by contact between the flat tip portion of the leaf spring and the convex portion of the pressurizing tool. desirable.

  According to the first aspect of the present invention, the leaf spring restrains the movement of the roller in the circumferential direction around the insulating rotation shaft by the fitting structure of the latching hole at the tip of the leaf spring and the latching pin of the pressurizing tool. is doing. This fitting position is farther away from the insulated rotating shaft than the conventional fitting position between the receiving hole and the roller shaft. Therefore, according to the law of moment, the roller is moved in the circumferential direction with a smaller force than before. The movement can be prevented. Therefore, the degree of wear of the locking hole of the leaf spring due to the collision with the locking pin is also smaller than before, and the reliability of the roller contact device is improved.

  In addition, since the engagement position between the engagement hole and the engagement pin is farther from the insulating rotation shaft than the engagement position between the conventional roller shaft and the receiving hole, the circumferential direction of the roller is opposite when the tap is switched. If you try to move to, the locking pin will immediately collide with the locking hole, the roller will not move in the opposite circumferential direction when switching taps than before, the roller is more ideal for each contact The position will be moved. This is not limited to the case where the play amount of the lock hole with respect to the lock pin is equal to the play amount of the accommodation hole with respect to the roller shaft, and the same is true even if it is somewhat larger than that. Also in this point, the reliability of the roller contact device is improved.

  In the second aspect of the invention, the leaf spring restrains the movement of the roller in the circumferential direction and the centrifugal direction around the insulating rotation shaft by the fitting structure of the locking hole and the locking pin. The constraining structure and the structure of the pressure point can be clearly separated, wear of the pressure point can be suppressed, and the reliability of the roller contact device can be improved.

  In the invention of claim 3, since the pressing point to the pressurizing tool by the leaf spring is formed by the contact between the flat tip portion of the leaf spring and the convex portion of the pressurizing tool, it is simpler than before. The structure improves the reliability of the roller contact device.

(A) to (c) are partially cutaway side views of a tap selector to which the present invention is applied. The tap steady state, the state where three taps are in contact at the same time, and the intermediate position during tap switching are shown. Indicates the state of electrical disconnection. (A) to (C) are perspective views showing a tap selector, showing a tap steady state, a state immediately before a roller leaves a fixed contact during tap switching, and a state of electrical disconnection at an intermediate position during tap switching. . (A) (b) The figure shows the exploded view and assembly drawing of a roller contact device. (A) (b) The exploded view and assembly drawing of a roller assembly are shown. It is a perspective view which shows the P-shaped flat plate containing a current collection contact. It is a perspective view which shows the tap selector of the odd-numbered side and the even-numbered side. It is explanatory drawing which shows the relationship between the radius in each contact point of a roller, and the distance from the axis line of an insulated rotating shaft to each contact point. It is a top view which shows the constraining structure of the roller to the circumferential direction and centrifugal direction in the roller contact apparatus of this invention. It is a partially cutaway side view showing another example of the roller contact device. It is a perspective view which shows another example of a roller contact apparatus. (A) to (c) are partially cutaway side views of a conventional tap selector. The tap steady state, the state where three points during tap switching are in contact at the same time, and the interruption of conduction at an intermediate position during tap switching. Indicates the state. It is a perspective view which shows the P-shaped flat plate containing the current collection contact used with the conventional tap selector. It is a top view which shows the constraining structure of the roller to the circumferential direction and centrifugal direction in the conventional roller contact apparatus.

  As shown in FIG. 6, the tap selector is configured such that odd-numbered taps T <b> 1 and even-numbered taps T <b> 2 are installed side by side on the left and right. The odd tap T1 and the even tap T2 have the same configuration as follows. In other words, the current collecting contact 2 surrounds the outer peripheral position of the center of the insulated rotating shaft 1 as a reference, and a plurality of tap switching support contacts 3 are arranged on the outer periphery of the current collecting contact 2 at intervals in the circumferential direction. Are projected radially. Further, most of the circumferential direction of the fixed contact 4 is arranged at a position farther from the outer periphery than the space between the adjacent tap switching support contacts 3 and 3. On the inner peripheral side corresponding to the end portion of the fixed contact 4 in the circumferential direction, the end portion of the tap switching support contact 3 is arranged to face. Therefore, the fixed contact 4 and the tap switching support contact 3 are arranged in a zigzag manner along the circumferential direction so that the end portions face each other. After such an arrangement, the roller contact device 5 protrudes outward and is fixed to the insulated rotating shaft 1.

  As shown in FIG. 1, FIG. 5, or FIG. 6, the current collecting contact 2 and the tap switching support contact 3 are formed as an integral part composed of a P-shaped flat plate. This is a P-shape cut out from a belt-like flat plate. Of the P-shaped portion, the C-shaped portion or the ring-shaped portion, that is, the portion surrounding the insulating rotating shaft 1 circumferentially, the inner peripheral portion is the current collecting contact 2 and the portion surrounded circumferentially The outer peripheral portion, that is, a plurality of arc-shaped belt portions arranged at intervals in the circumferential direction is used as the tap switching support contact 3. Further, a reinforcing portion 6 that ensures the rigidity of the current collecting contact 2 is provided continuously to the tap switching support contact 3. The reinforcing portion 6 extends from the tap switching support contact 3 in a radial direction centering on the insulated rotating shaft 1 and passes between adjacent fixed contacts 4 and 4 while maintaining a non-contact insulation state with the fixed contact 4. is doing.

  On the other hand, of the P-shaped flat plate, a portion other than the ring shape (a portion extending linearly from the ring-shaped portion) is used as the attachment portion 7. The attachment portion 7 is also a current collecting terminal. This P-shaped flat plate is disposed on the insulating mounting plate 8 as shown in FIG. 2 or FIG. 6, between the mounting portion 7 and the insulating mounting plate 8, and between the tip of the reinforcing portion 6 and the insulating mounting plate. A block-shaped spacer 9 is interposed between the mounting portion 7 and the reinforcing portion 6, and the insulating mounting plate 8 is bolted together with the spacer 9. Although not shown, the insulating mounting plate 8 is connected to the frame shaft of the entire on-load tap changer.

  The fixed contact 4 is a flat plate having the same thickness as the current collecting contact 2 as shown in FIG. And as for the fixed contact 4, the inner peripheral part becomes a part which fulfill | performs the function as the fixed contact 4, and the outer peripheral part becomes an attachment part. As shown in FIG. 6, the mounting portion is bolted to the insulating mounting plate 8 via a spacer 9 on the lower surface thereof as in the current collecting contact 2.

  As described above, the current collecting contact 2, the tap switching support contact 3, and the fixed contact 4 have the same thickness, and are aligned in a direction orthogonal to the insulated rotating shaft 1. This flat space arranged in a straight line is called a contact arrangement space.

  As shown in FIG. 1, the roller contact device 5 has a vertically symmetrical structure, and a body 11 having a rotation region on the inner peripheral side of the current collecting contact 2 is fixed to the insulating rotating shaft 1 and is vertically moved with reference to the contact arrangement space. Various parts are symmetrically attached to the body 11. Hereinafter, only the upper part of the symmetrical part will be described. As shown in FIG. 1 to FIG. 3 or FIG. 6, the base portion of the roller shaft 12 is accommodated on the upper side of the body 11, and the tip portion of the roller shaft 12 extends radially above the fixed contact 4. A cylindrical roller 13 is rotatably supported by a part via a bearing 14. Further, a pressurizing tool 15 is fixed to an intermediate portion of each roller shaft 12. Accordingly, the roller shaft 12, the roller 13, the bearing 14, and the pressing tool 15 are integrated into a roller assembly. In addition, the base portion of the leaf spring 16 is bolted to the upper surface side of the body 11, and the tip portion of the leaf spring 16 is locked to the pressurizing tool 15. Thereby, the downward pressing force of the leaf spring 16 is transmitted from the pressurizing tool 15 integrated with the roller shaft 12 to the roller 13, and the downward contact pressure with respect to each contact is applied to the roller 13.

  The body 11 is in a block shape as shown in FIG. 1 or FIG. 3, and is fixed from the side by a set screw 18 through a punched hole 17 penetrating vertically. The body 11 has an accommodation hole 19 for holding the base portion of the roller shaft 12 on the upper surface thereof. The accommodation holes 19 are formed radially from the insulating rotating shaft 1 side. Further, the degree of fitting of the roller shaft 12 into the accommodation hole 19 is in a state where there is play in the circumferential direction around the insulating rotating shaft 1, and in the vertical direction (depth direction) than in the play. There is a wide margin. That is, there is a margin for holding the roller shaft 12 in an inclined state so that the distance from the upper surface of the contact arrangement space increases as the distance from the insulated rotating shaft 1 side increases. Moreover, in order to maintain the depth of the accommodation hole 19 while taking a margin, the base of the roller shaft 12 is made small in diameter so that its bottom surface is horizontal. Then, a plate-like spring seat 21 that covers the accommodation hole 19 is placed on the upper surface of the body 11, and a base portion of the two-layer leaf spring 16 is placed on the spring seat 21. 16 is fixed to the body 11 with a bolt 22 via a spring washer 22a. Although not shown, the body 11 and the spring seat 21 may be an integral block.

  As shown in FIG. 1 or FIG. 4, each roller 13 is formed with a small diameter in three steps toward the center of the insulating rotating shaft 1. That is, the size of the diameter is the magnitude relationship of the contact part for fixed contact 23> the contact part for tap switching support contact 24> the contact part for current collecting contact 25. As shown in FIG. 1B, the outer peripheral surfaces of the contact portion for fixed contact 23 and the contact portion for current collecting contact 25 are provided with Rs that swell in the direction away from the roller shaft 12, respectively. The points A and C make point contact with the fixed contact 4 and the current collecting contact 2. Further, the tap switching support contact contact portion 24 has an outer peripheral surface so that the intermediate point of the straight line connecting the contact points A and C becomes the contact point B. In the figure, almost half of the outer peripheral surface closer to the insulating rotating shaft 1 is formed in a tapered shape with a small diameter toward the base of the roller shaft 12, while the outer peripheral surface is separated from the insulating rotating shaft 1. Almost half of the far side is formed in a reverse taper shape. The tap switching support contact portion 24 is not related to the rated passing current and does not need to be applied with a desired contact pressure. Therefore, there is no necessity for point contact at only one point. Therefore, the tap switching support contact contact portion 24 is in contact with the line segment of the tapered surface including the contact point B.

In addition, the axis L2 of the roller shaft 12 in the inclined state, the axis L1 of the insulated rotating shaft 1, and the extending direction of the upper surface of the contact arrangement space (straight line L3 passing through the contact points A, B, C) at one point P The diameters at the contact points A, B, and C of the contact portion 23 for fixed contact, the contact portion 24 for tap switching support contact, and the contact portion 25 for current collecting contact are sized so as to intersect and maintain the intersected state. It is formed. This will be described in more detail. As shown in FIG. 7, the distance from the axis L1 of the insulated rotating shaft 1 to each contact point A, B, C is K23, K24, K25, and from the axis L2 of the roller shaft 12 to each contact point A, B, C. , R23, R24, and R25, the rotation angle of the insulating rotating shaft 1 is θ1, and the rotation angle of the roller 13 is θ2. When the roller 13 rolls without sliding on each contact point as the insulated rotating shaft 1 rotates, the following relational expression is established from the arc length formula.
θ1 = θ2 × R23 / K23 = θ2 × R24 / K24 = θ2 × R25 / K25
From the above relational expression, the following relational expression is established.
R23 / K23 = R24 / K24 = R25 / K25
Therefore, by making the diameters at the respective contact points A, B, and C in this way, even if the current collecting contact 2, the tap switching support contact 3 and the fixed contact 4 have the same thickness, the insulated rotating shaft 1 is rotated. In this case, the roller 13 rolls without sliding on the surface of each contact 2, 3, 4.

  Further, the roller 13 has a cylindrical shape, and a shaft through hole 26 is provided at a central portion thereof for inserting the tip of the roller shaft 12. The shaft through hole 26 is formed with a portion corresponding to the inside of the tap switching support contact contact portion 24 having a slightly larger diameter than the roller shaft 12, and inside the fixed contact contact portion 23 and the current collecting contact contact portion 25. A portion corresponding to is formed in a step shape larger in diameter than that of the contact portion 24 for the tap switching support contact, and each bearing 14 is accommodated. In addition, as shown in FIG. 1 (c), a surplus portion is provided between the tap switching support contact contact portion 24 and the current collection contact contact portion 25 as much as is necessary for attaching the R of the current collection contact contact portion 25. Z is present.

  As shown in FIG. 1 or FIG. 4, the bearing 14 is accommodated while being positioned between the roller shaft 12 and the roller 13. The bearing 14 accommodated in the fixed contact portion 23 is a ball bearing, is positioned by a retaining ring 27, and the retaining ring 27 is fitted in the groove at the tip of the roller shaft 12. On the other hand, the bearing 14 accommodated inside the current collecting contact portion 25 is a needle bearing, and is positioned by the pressurizing tool 15, and the pressurizing tool 15 is fixed to the roller shaft 12.

  As shown in FIG. 2 or 4, the pressurizing tool 15 is inclined similarly to the roller shaft 12. Further, the pressurizing tool 15 has a block shape, and its base portion close to the insulating rotating shaft 1 is a roller shaft mounting portion 28 and its distal portion far from the insulating rotating shaft 1 is a leaf spring locking portion 29.

  As shown in FIG. 1 or 4, the roller shaft mounting portion 28 has an insertion hole 31 into which the base portion of the roller shaft 12 is inserted in the central portion of the lateral width of the surface on the side of the insulated rotating shaft 1. Screw holes 32 penetrating in a direction perpendicular to each other. On the other hand, a positioning hole 33 is formed in the roller shaft 12 so as to be recessed in the surface facing the screw hole 32. The pressurizing tool 15 is fixed to the roller shaft 12 by screwing the captive screw 34 through the screw hole 32 and fitting the tip of the captive screw 34 into the positioning hole 33.

  Further, as shown in FIG. 1 or FIG. 3, the leaf spring locking portion 29 is provided with a concave groove portion 35 opening downward on the bottom surface thereof. In the concave groove portion 35, the base side of the current collecting contact contact portion 25 and the tap switching support contact contact portion 24 is accommodated with a gap above and on the left and right sides. In this way, the upper part and the left and right sides from the current collecting contact part 25 toward the fixed contact part 23 are covered.

  As described above, the leaf spring locking portion 29 is inclined in the same manner as the roller shaft 12 as viewed from the side as shown in FIG. The apex of the convex portion 29 a becomes a pressing point D by the leaf spring 16 and comes into contact with the flat surface of the tip portion of the leaf spring 16. The pressurizing point D is a position directly above the midpoint of the straight line connecting the contact point A of the fixed contact point contact portion 23 and the contact point C of the current collecting contact point portion 25. By doing so, the tap In the steady state, the downward load W by the leaf spring 16 is equally divided and acts on the contact point A on the outer peripheral side and the contact point C on the inner peripheral side by ½ W. Most of the load acts on the central contact point B as it is. Accordingly, the upper and lower rollers 13 and the roller shaft 12 are maintained in a constant inclined state both in the tap steady state and in the middle of the tap switching.

  As shown in FIG. 4, the upper surface of the leaf spring locking portion 29 is formed with fitting holes 36 on the insulating rotary shaft 1 side with respect to the pressurizing point D with a space left and right. A lower part of a locking pin (spring pin having a C-shaped cross section) 37 is press-fitted into each fitting hole 36, and the locking pin 37 is fixed in a state where the upper part protrudes upward from the plate spring locking part 29.

  As shown in FIG. 1 or FIG. 6, the leaf spring 16 is formed such that its base portion is horizontally formed, its intermediate portion is inclined so as to rise as it moves away from the insulating rotating shaft 1, and its tip portion is formed substantially horizontally. is there. The base of the leaf spring 16 is fixed to the body 11 via the spring seat 21 as described above. In this fixed state, the leaf spring 16 extends so that the tip thereof is farther from the insulating rotary shaft 1 side than the leaf spring locking portion 29, and the tip thereof is the tip of the leaf spring locking portion 29. It is bent slightly upward by the upper surface, and a downward restoring force is generated as a whole. Further, a locking hole 38 is formed at a position corresponding to each locking pin 37 at the tip of the leaf spring 16. The locking pin 37 is fitted in the locking hole 38 with play.

  The tap selector described above switches taps as follows. As shown in FIG. 1 (a) or FIG. 2 (a), in the steady state of the tap, the upper and lower rollers 13 of the roller contact device 5 are in the form of a point contact at the lateral center of the selected contact point 2 and the fixed contact point 4 selected. Hold it. When the insulated rotating shaft 1 is rotated to change the tap from the tap steady state, the roller contact device 5 rotates together. The contacts held by the upper and lower rollers 13 of the roller contact device 5 are changed stepwise as follows. In other words, the contact points to be sandwiched are (a) the current collecting contact 2 and the fixed contact 4 stage selected before switching as shown in the figure, and (b) the three contact stages including the fixed contact 4 before switching as shown in the figure. (C) The stage of the current collecting contact 2 and the tap switching support contact 3 as shown in the figure, again (b) The stage of three contacts including the fixed contact 4 after switching as shown in the figure, and finally (b) Thus, the tap is switched while changing the current collecting contact 2 and the fixed contact 4 after switching. Since some of the tap switching support contacts 3 are continuously provided with reinforcing portions 6, the roller contact device 5 is connected to the current collecting contact 2, the tap switching supporting contact 3, and the reinforcing portion when the tap is switched. 6 points may be pinched. However, since the reinforcing portion 6 is integrated with the current collecting contact 2 and has the same potential, there is no problem.

  Further, the tap selector can switch the tap while the roller contact device 5 maintains a constant vertical symmetry structure. At this time, the upper and lower rollers 13 roll on the respective contacts 2 to 4 without slipping. is there. Therefore, since the roller contact device 5 is caused by the rolling friction caused by the bearing 14 and the vertical movement with respect to the rotation surface (the upper and lower surfaces of the contacts 2 to 4), the load is applied when the roller 13 rotates. The driving torque for rotating 1 is remarkably reduced, and the reliability and life of the contact are also greatly improved.

  When the tap is switched, the roller contact device 5 rotates together with the rotation of the insulating rotating shaft 1. Therefore, the roller 13 receives a force opposite to the rotation direction and a centrifugal force from each contact point. The roller assembly containing is going to move. However, when the roller assembly moves by an amount corresponding to the play amount of the locking pin 37 and the locking hole 38, the locking pin 37 and the locking hole 38 collide with each other, and the leaf spring 16 prevents further movement, and the insulating rotation. The roller assembly is restrained so as not to move in the circumferential direction and the centrifugal direction around the shaft 1. The distance r1 from the center of the insulating rotating shaft 1 to the fitting position of the locking pin 37 and the locking hole 38 is greater than the distance r from the conventional fitting position of the roller shaft 12 and the receiving hole 19 as shown in FIG. Therefore, it is possible to prevent the roller assembly from moving in the circumferential direction with a smaller force than before.

  9 and 10 show another example of the roller contact device 5. Although this is also a vertically symmetric structure, the three contact portions 23, 24, 25 of the roller 13 have the same diameter, and the axis L2 of the roller shaft 12 is parallel to a straight line passing through the contact points A, C. .

  In this example, the contact point B of the tap switching support contact part 24 is not located at the midpoint of the straight line connecting the contact point A of the fixed contact part 23 and the contact point C of the current collecting contact part 25. However, since the contact point B of the tap switching support contact portion 24 is closer to the contact points A and C with respect to the pressurization point D located immediately above the intermediate point, the load from the pressurization point D Most of it takes. Then, no slip occurs at the contact point B of the tap switching support contact portion 24, but slippage due to rotation delay occurs at the contact point A of the fixed contact contact portion 23, and at the contact point C of the current collecting contact contact portion 25. Sliding due to rotational advance occurs. When the insulated rotating shaft 1 is rotated, not only rolling friction but also sliding friction is generated on the roller 13, and the driving torque for rotating the insulated rotating shaft 1 is slightly increased as compared with the previous example. And the fitting structure of the locking pin 37 is the same. In this example, two bearings 14 corresponding to the contact portion 23 for the fixed contact are provided in parallel along the axis L2 of the roller shaft 12, a needle bearing is provided on the insulated rotating shaft side, and a thrust bearing is provided on the outer peripheral side thereof. A bearing is used. The reason why the thrust bearing is used is to reduce a thrust load between the roller shaft 12 and the roller 13 when slipping occurs.

  Further, in the case of this example, the structure of the convex portion 29a of the pressurizing tool 15 is a structure in which the pressurizing tool 15 is entirely horizontal, and the convex portion 29a protruding locally is provided on the horizontal surface. . In this case, the vertical height of the roller contact device 5 is somewhat longer than in the previous example.

  The present invention is not limited to the above embodiment. For example, the roller contact device 5 has a structure in which one set of upper and lower rollers 13 is held, but may have a structure in which two sets are held. In this case, the roller shaft 12 may be held in parallel with the body 11.

  Moreover, the fitting structure by the locking pin 37 and the locking hole 38 can also be used for the conventional tap selector and roller contact device as shown in FIG. In other words, the three contacts of the fixed contact, the tap switching support contact, and the current collecting contact are made thicker as they get closer to the insulated rotating shaft, and the tap is switched while the roller and the roller shaft maintain a horizontal parallel state. It is.

1 Insulating rotating shaft 2 Current collecting contact 3 Tap switching support contact 4 Fixed contact 5 Roller contact device 6 Reinforcing part 7 Mounting part 8 Insulating mounting plate 9 Spacer 11 Body 12 Roller shaft 13 Roller 14 Bearing 15 Pressure tool 16 Leaf spring 17 Hole 18 Set screw 19 Housing hole 21 Spring seat 22 Bolt 22a Spring washer 23 Contact part for fixed contact 24 Contact part for tap switching support contact 25 Contact part for current collecting contact 26 Shaft through hole 27 Retaining ring 28 Roller shaft mounting part 29 Leaf spring locking portion 29a convex portion 31 insertion hole 32 screw hole 33 positioning hole 34 restraining screw 35 concave groove portion 36 fitting hole 37 locking pin 38 locking hole

For T1 odd-numbered taps For T2 even-numbered taps A contact point (corresponding to fixed contact) B contact point (corresponding to tap switching support contact)
C contact point (corresponds to current collecting contact) D pressurization point L1 axis (corresponds to insulated rotating shaft) L2 axis (corresponds to roller shaft)
L3 straight line P one point r1 distance r2 distance

Claims (3)

A ring-shaped current collecting contact (2), a plurality of tap switching support contacts (3), and a plurality of fixed contacts (4) that surround the outer periphery in turn around the insulated rotating shaft (1) are always fixed up and down. While maintaining a symmetrical structure, each roller (13) can be clamped between upper and lower cylindrical rollers (13), and a contact portion for collecting contact (25) and a contact portion for tap switching support contact ( 24) and a contact portion for fixed contact (23), in the case of a tap steady state, a current collecting contact (2) and a selected fixed contact (4), and in a tap switching state, an insulated rotating shaft (1) A roller contact device (5) for a tap selector that rotates about the axis and temporarily holds the above-mentioned three contacts by upper and lower rollers (13),
An accommodation hole (19) is formed on the upper side of the vertically symmetrical body (11) fixed to the insulating rotating shaft (1), and the base of the roller shaft (12) is accommodated in the accommodation hole (19). 12) The front part of 12) extends toward the fixed contact (4), the roller (13) is rotatably supported on the front part of the roller shaft (12), and a downward contact pressure is applied to the roller (13). The base of the pressurizing tool (15) is fixed to the middle part of the roller shaft (12), and the upper range from the current collecting contact contact part (25) toward the fixed contact point contact part (23) is set in the pressurizing tool. The base of the leaf spring (16) that covers the tip of (15) and presses the pressure tool (15) is fixed to the upper surface of the body (11), and the front side of the leaf spring (16) is fixed to the pressure tool ( 15), the movement in the centrifugal direction of the roller (13) is restrained by being locked along the upper side of the plate spring (1). The pressure point (D) to the pressure tool (15) by the contact point (C) to the current collecting contact (2) of the current collecting contact point (25) and the contact point (23) for fixed contact point. In the roller contact device for tap selector (5) at a position directly above the midpoint of the straight line connecting the contact point (A) to the fixed contact (4) of
A locking hole (38) is provided on the front side of the leaf spring (16), and a locking pin (37) is projected from the pressurizing tool (15) so that the locking hole (38) and the locking pin ( 37) A contact mechanism for the tap selector, wherein the leaf spring (16) restrains the movement of the roller (13) in the circumferential direction around the insulated rotating shaft (1). .   Due to the fitting structure of the locking hole (38) and the locking pin (37), the movement of the roller (13) in the circumferential direction and the centrifugal direction around the insulating rotating shaft (1) is controlled by a leaf spring (16). The roller contact device for a tap selector according to claim 1, wherein   The pressure point (D) applied to the pressure tool (15) by the leaf spring (16) is brought into contact with the flat tip of the leaf spring (16) and the convex portion (29a) of the pressure tool (15). 3. The roller contact device for a tap selector according to claim 2, wherein the roller contact device is formed.

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