JP2023124948A - solenoid - Google Patents

Abstract

To provide a solenoid which seals a space providing a switch from liquid such as lubrication oil and water, and dust, and can sufficiently secure reliability of the switch.SOLUTION: A shaft 57 fixed to a plunger 80 presses up a pin 50, and the pin 50 makes a movable contact 61 separate from a fixing contact 62 by pressing up a plate spring 63 that supports the movable contact 61 of a switch 60. But since the pin 50 is inserted into a lower side packing 40 and an upper side packing 41, provided to a penetration hole 24, and an immersion such as lubrication oil or dew drop to a contact chamber 19 is prevented by the lower side packing 40 and the upper side packing 41. Also, since the pin 50 is linked with slide of the plunger 80 when the shaft 57 is contacted to the pin 50, a stroke of the pin 50 can be easily secured in a sufficient length.SELECTED DRAWING: Figure 2

Description

The present invention relates to a solenoid, and particularly to a solenoid having a switch structure.

Solenoids used in vehicles, etc. that have a switch structure are usually used to seal the space where the switch is installed to prevent lubricating oil, water, etc. from entering the space where the switch is installed. It has the following configuration. FIG. 10 is a sectional view of a solenoid having a switch structure according to the prior art. In FIG. 10, 100 is a solenoid, 110 is a contact assembly, 111 is a movable contact, 112 is a fixed contact, 113 is a movable contact, 114 is a fixed contact, 115 is a contact spring, 116 is a diaphragm, 117 is a terminal base, and 118 is a housing 119 is a yoke, 120 is a housing recess, 121 is a plunger, 122 is a connecting shaft, 123 is a housing, 124 is a coil bobbin, 125 is a coil, 126 is a return spring, 127 is a mold portion, and 128 is a communication hole.

FIG. 10 shows a solenoid disclosed in Japanese Patent Application Publication No. 2021-18957. The solenoid 100 includes a contact assembly 110, a terminal base 117, a yoke 119, a plunger 121, a coil bobbin 124, and the like inside a case consisting of a housing 123 and a molded part 127. A yoke 119 is provided between the coil bobbin 124 and the terminal base 117, and the inside of the case consisting of the housing 123 and the molded part 127 is vertically divided by the yoke 119. Further, the yoke 119 has an accommodation recess 120 that is open upward, and a communication hole 128 that communicates between the inside of the coil bobbin 124 and the accommodation recess 120 . The diaphragm 116 is provided in the housing recess 120. Further, the peripheral portion of the diaphragm 116 is sandwiched between the peripheral portion of the housing recess 120 of the yoke 119 and the housing recess 120 of the yoke 119 . Furthermore, when the coil 125 provided on the coil bobbin 124 is energized, the plunger 121 is attracted to the yoke 119 and rises together with the connecting shaft 122 connected to the plunger 121 to the point where it pushes up the center of the diaphragm 116. When the coil 125 is de-energized, it is pushed back downward by the elastic force of the return spring 126 and returns to its original position. In addition, movable contacts 111 and 113 are provided in contact assembly 110. Further, since the contact assembly 110 is urged downward by the elastic force of the contact spring 115, the movable contacts 111 and 113 are in contact with the fixed contacts 112 and 114 when the coil 125 is not energized.

In the above configuration, when the coil 125 is energized, the plunger 121 is attracted to the yoke 119 and rises, and the plunger 121 is attracted to the yoke 119, and together with the connecting shaft 122 connected to the plunger 121, pushes up the center part of the diaphragm 116. . When the center of the diaphragm 116 is pushed up, the contact assembly 110 is also pushed up via the diaphragm 116, so that the movable contacts 111 and 113 are separated from the fixed contacts 112 and 114. When the coil 125 is de-energized, it is pushed back downward by the elastic force of the return spring 126, and at the same time is urged downward by the elastic force of the contact spring 115, so that the movable contacts 111 and 113 are again connected to the fixed contacts 112 and 113. 114. Therefore, the diaphragm 116 can be downsized, and the fixed contacts 112 and 114 and the movable contacts 111 and 113 can be sealed against liquids such as lubricating oil.

By the way, in the above configuration, since the diaphragm 116 is miniaturized, the vertical movement distance of the movable contacts 111 and 113, that is, the stroke length, is considerably shorter than the stroke length of the plunger 121. The short stroke length of the movable contacts 111 and 113 affects the reliability of the switch made up of the fixed contacts 112 and 114 and the movable contacts 111 and 113. If the diaphragm is made larger, the stroke length of the central portion can be increased, thereby improving the reliability of the switch. That is, the strokes of the movable contacts 111 and 113 can be ensured to have a necessary and sufficient length, and can be sufficiently spaced from the fixed contacts 112 and 114. However, the lead wires or coil wires that connect the coil 125 and the fixed contacts 112 and 114 or the wiring pattern need to be wired in the peripheral area of the diaphragm, but when the diaphragm is enlarged, In order to secure space, the diameter of the solenoid has to be increased, which is not a desirable solution.

JP 2021-18957 Publication

In order to solve the above-mentioned problems, the present invention provides a solenoid having a configuration that can seal a space in which a switch is provided from liquids such as lubricating oil and water and dust, and also ensure sufficient reliability of the switch. The purpose is to provide.

The invention according to claim 1 includes: a base having a through hole formed in the center thereof extending along the central axis; A contact chamber constituent member having a through hole connected to the through hole, a fixed contact fixed to the contact chamber constituent member, a plate spring having a base end fixed to the contact chamber constituent member, and the plate spring. a switch including a movable contact that is provided on the tip side of the switch and faces the fixed contact and that is capable of coming into contact with and separating from the fixed contact; and a switch that is electrically connected to the switch. a coil, the through-hole of the base, and the through-hole of the contact chamber constituent member so as to be slidable along the central axis, and when raised, the plate of the switch. a pin configured to press and bend a spring to separate the movable contact from the fixed contact; and a packing formed in a substantially annular shape, provided inside the through hole of the base, and into which the pin is inserted. , a solenoid having a plunger that is slidably provided along the central axis and is attracted to the base when the coil is energized; slides toward the base, the plunger or a shaft fixed to the plunger pushes up the pin, and the pin presses and bends the leaf spring of the switch to move the movable contact to the fixed contact. This is a solenoid that is characterized by being separated from the

The invention according to claim 2 is the invention according to claim 1, wherein the pin is formed in a substantially annular shape and is provided inside the through hole of the base and above the packing. The solenoid according to claim 1, further comprising another packing into which the solenoid is inserted.

The invention according to claim 3 is the invention according to claim 2, which is formed in a substantially annular shape, is provided inside the through hole of the base, and is between the packing and the another packing. The solenoid further includes an intervening spacer ring.

The invention according to claim 4 is the solenoid according to claim 3, further comprising grease provided in a gap surrounded by the packing, the other packing, and the spacer ring. .

The invention according to claim 5 is the invention according to any one of claims 2 to 4, wherein the base has an inner diameter smaller than an outer diameter of the packing at a portion near the lower end of the through hole. This solenoid is characterized by being formed as follows.

The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the pin has a main body portion having a substantially cylindrical shape and extending along the central axis. The base includes a flange portion protruding in a direction perpendicular to the central axis in the vicinity of the intermediate portion in the direction of the central axis, and the base has a substantially circular shape at the center of the upper surface, and a flange portion extending from the through hole. The main body of the pin is formed with a recessed portion having a large diameter, is disposed in the recessed portion of the base, has a substantially annular plate shape, has an outer diameter larger than the through hole of the base, and has an inner diameter. The solenoid further includes a restraining plate formed to be larger than the flange portion of the pin and smaller than the flange portion of the pin, and inserted below the flange portion of the pin.

The invention according to claim 7 is the invention according to any one of claims 1 to 5, wherein the pin has a main body portion having a substantially cylindrical shape and extending along the central axis. The base includes an E-shaped retaining ring fixed to a portion near the intermediate portion in the direction of the central axis, and the base has a substantially circular recessed portion having a diameter larger than the through hole at the center of the upper surface. is formed, is arranged in the concave portion of the base, has a substantially annular plate shape, has an outer diameter larger than the through hole of the base, and has an inner diameter larger than the main body of the pin, The solenoid further includes a restraining plate formed to be smaller than the E-shaped retaining ring of the pin and inserted below the E-shaped retaining ring of the pin.

According to the invention described in claim 1, the plunger or the shaft fixed to the plunger pushes up the pin, and the pin presses and bends the leaf spring supporting the movable contact of the switch, thereby separating the movable contact from the fixed contact. However, since the pin is inserted through the packing provided in the through hole of the base and the contact chamber constituent member, the packing prevents lubricating oil, condensation, etc. from entering the contact chamber. Furthermore, when the plunger or the shaft fixed to the plunger is in contact with the pin, the pin moves in conjunction with the sliding movement of the plunger, making it very easy to ensure the necessary and sufficient stroke length of the pin. be.

According to the second aspect of the invention, by providing two packings, it is possible to more reliably prevent lubricating oil or the like from entering the contact chamber.

According to the invention set forth in claim 3, it is possible to suppress the displacement of the two packings due to repeated sliding of the pin.

According to the fourth aspect of the invention, the grease can more reliably prevent lubricating oil and the like from entering the contact chamber.

According to the invention set forth in claim 5, since the inner diameter of the portion near the lower end of the through hole is smaller than the outer diameter of the packing, the packing is prevented from coming off to the outside of the through hole due to repeated sliding of the pin. can.

According to the invention described in claim 6, the downward sliding of the pin can be restricted by the restraining plate, and the stroke of the pin can be lengthened or shortened by adjusting the thickness of the restraining plate. Adjustment is also easy.

According to the invention set forth in claim 7, the downward sliding of the pin can be restricted by the restraining plate, and the stroke of the pin can be lengthened or shortened by adjusting the thickness of the restraining plate. Adjustment is also easy.

FIG. 2 is a cross-sectional view of the solenoid in a non-energized state according to the first embodiment of the present invention. FIG. 2 is a partially enlarged sectional view of a pin and its surroundings in a non-energized state of the solenoid according to the first embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view of the upper main body portion of the pin and its surroundings when the solenoid is in a non-energized state according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the solenoid in the energized state according to the first embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view of a pin and its surroundings in a energized state of the solenoid according to the first embodiment of the present invention. FIG. 2 is a front view of the solenoid in a non-energized state according to the first embodiment of the present invention. FIG. 2 is a plan view of the solenoid according to the first embodiment of the present invention in a non-energized state with the lid removed. FIG. 7 is a partially enlarged sectional view of a pin and its surroundings in a non-energized state of a solenoid according to a second embodiment of the present invention. FIG. 7 is a partially enlarged sectional view of a pin and its surroundings in a non-energized state of a solenoid according to a third embodiment of the present invention. FIG. 2 is a cross-sectional view of a solenoid having a switch structure according to the prior art.

First, in the solenoid according to each embodiment of the present invention, the central axes of the base, contact chamber component, coil bobbin, suction coil, holding coil, pin, plunger, and shaft are aligned. Therefore, in the description of the solenoids according to the following embodiments, when the term "central axis" is used, it refers to the above-mentioned central axis that is common to these. Furthermore, even when the term "central axis" is used in the claims, it refers to the central axis common to the base, contact chamber constituent members, plunger, etc. described in the claims. Further, the orientation when the solenoid according to each embodiment of the present invention is actually attached to a diesel engine does not necessarily match the orientation described in each drawing of the present invention. Therefore, in the following description, the terms "ascending" and "descending", "upper side" and "lower side", and "upper" and "lower" are expressed for convenience in accordance with the arrangement of each drawing. The operating direction may differ from the actual installation.

FIG. 1 is a sectional view of a solenoid in a non-energized state according to a first embodiment of the present invention. In FIG. 1, 10 is a solenoid, 19 is a contact chamber, 20 is a base, 22 is a fixing flange, 22a is a top surface, 30 is a contact chamber component, 31 is a contact chamber base, 31a is a bottom surface, and 32 is a fixing part , 33 is a cylindrical side wall portion, 46 is an auxiliary coil spring, 48 is a guide pipe, 49 is an O-ring, 50 is a pin, 56 is a return coil spring, 57 is a shaft, 58 is an upper end surface, 59 is a spacer, and 60 is a return coil spring. 61 is a movable contact, 62 is a fixed contact, 63 is a leaf spring, 65 is a conductive and fixed member, 68 is a fixed member, 70 is a coil bobbin, 71 is a winding drum part, 72 is a first flange part, 73 is a first 2 flange portion, 74 a third flange portion, 75 a fourth flange portion, 76a a notch portion, 77 a suction coil, 78 a holding coil, 79 a lid, 80 a plunger, 81 a through hole, 82 is a spring receiving concave portion, 83 is a case, 84 is a bottom plate portion, 85 is an opening, 86 is a small diameter cylindrical portion, 87 is a stepped portion, 88 is a large diameter cylindrical portion, and 89 is a bent portion. Further, FIG. 2 is a partially enlarged sectional view of the pin and its surroundings in a non-energized state of the solenoid according to the first embodiment of the present invention. In FIG. 2, 21 is a main body, 23 is an annular projection, 24 is a through hole, 25 is an inner peripheral surface, 29 is a spring seat, 40 is a lower packing, 41 is an upper packing, 42 is a spacer ring, and 45 is a A restraining plate, 47 is an O-ring, 51 is a lower main body, 52 is a lower end face, 54 is an upper main body, 55 is an upper end face, 64 is a conductive member, 76b is a notch, and other symbols are shown in the figure. Shows the same thing as 1. Furthermore, FIG. 3 is a partially enlarged cross-sectional view of the upper body portion of the pin and its surroundings when the solenoid is in a non-energized state according to the first embodiment of the present invention. In FIG. 3, 26 is a bottom surface, 27 is a vertical surface, 28 is a recessed portion, 34 is a lower protrusion, 35 is an upper protrusion, 36 is a spring receiver, 36a is an inner peripheral surface, and 37 is a large diameter penetration for storage. The hole 38 is a small-diameter through hole for storage, 39 is a step surface, 53 is a flange part, and other symbols are the same as in FIG. 1. Moreover, FIG. 6 is a front view of the solenoid in a non-energized state according to the first embodiment of the present invention. All the symbols used in FIG. 6 indicate the same ones as in FIG. 1. Furthermore, FIG. 7 is a plan view of the solenoid according to the first embodiment of the present invention in a non-energized state with the lid removed. In FIG. 7, 66a and 66b are coil wires, 67a and 67b are lead wires, 68a is a first fixed collar, 68b is a second fixed collar, 69a, 69b, 69c and 69d are through holes for wiring, and others. The symbols denote the same as in FIG. 1.

First, an overview of the solenoid 10 according to the first embodiment of the present invention will be described. As shown in FIG. 6, the solenoid 10 has an appearance that resembles a combination of cylinders with different diameters. Further, as shown in FIG. 1, an outer shell is formed by the case 83, the contact chamber constituent member 30, and the lid 79. Further, the solenoid 10 is a direct-acting solenoid in which a plunger 80 moves in a straight line, and is attached to a diesel engine body, although not shown. In addition, the case 83, the base 20, and the plunger 80 are all made of magnetic material, and serve as a path for the magnetic flux generated by energizing the attraction coil 77 and the holding coil 78. Furthermore, a switch 60 electrically connected to the attraction coil 77 is provided in the contact chamber 19, and turns the attraction coil 77 on or off in accordance with the elevation of the pin 50, as will be described later.

Furthermore, the components of the solenoid 10 will be explained in detail. As shown in FIG. 1, the case 83 has a substantially cylindrical shape extending from a substantially disk-shaped bottom plate portion 84 disposed on the control rack side of a diesel engine fuel supply pump (not shown) toward the contact chamber 19 side. A small diameter cylindrical part 86 continuous to the bottom plate part 84, a stepped part 87 having a substantially disc shape and continuous to the small diameter cylindrical part 86, and a large diameter cylinder having a substantially disc shape and continuous to the stepped part 87, which has a diameter larger than the small diameter cylindrical part 86. 88 , the large-diameter cylindrical portion 88 , and a bent portion 89 for fixing the fixing flange portion 22 of the base 20 . The bottom plate portion 84 is formed in a substantially disk shape and perpendicular to the central axis. A substantially circular opening 85 is formed in the center of the bottom plate portion 84, and a shaft 57 for operating the control rack is inserted through the opening 85. Further, a spacer 59 is arranged inside the bottom plate portion 84 so as to be in contact therewith. A guide pipe 48 is inserted into the small diameter cylindrical portion 86 . Furthermore, a fixing member 68 is press-fitted into the outer peripheral side of the small-diameter cylindrical portion 86 at the end thereof on the stepped portion 87 side. A coil bobbin 70 is arranged inside the large diameter cylindrical portion 88 . The bent portion 89 is formed thinner than the large-diameter cylindrical portion 88 , is bent to cover the edge of the fixing flange portion 22 of the base 20 , and fixes the base 20 to the case 83 . have a role.

The coil bobbin 70 is made of resin and is disposed between the stepped portion 87 of the case 83 and the fixing flange portion 22 of the base 20. Further, the coil wire wound in the gap between the first flange part 72 and the second flange part 73 of the winding drum part 71 constitutes an attraction coil 77, and The coil wire wound in the gap between the holding coil 74 and the holding coil 78 constitutes a holding coil 78. Furthermore, the gap between the third flange part 74 and the fourth flange part 75 becomes a space for connecting a lead wire (not shown) and the ends of the coil wires forming the attraction coil 77 and the holding coil 78. Furthermore, a notch 76a formed in the first flange 72 and a notch 76b formed on the base 20 side shown in FIG. 49 and an O-ring 47 are provided.

The attraction coil 77, together with the holding coil 78, generates a magnetic field that attracts the plunger 80 toward the base 20 by excitation. Further, the attraction coil 77 is electrically connected to the switch 60, and when the plunger 80 rises and pushes up the pin 50, the switch 60 is turned off and the current supply is stopped. The holding coil 78 is provided to hold the plunger 80 in the raised position even after the switch 60 is turned off and the attraction coil 77 is no longer energized. However, since the holding coil 78 is configured to be energized at the same time as the attraction coil 77, it also has a role as an auxiliary attraction coil. The spacer 59 is provided between the bottom plate 84 and the plunger 80 to prevent the plunger 80 from sticking to the bottom plate 84 of the case 83 and preventing normal operation of the solenoid 10. It is set up like this. The guide pipe 48 has a role of guiding the sliding movement of the plunger 80 and is disposed inside the small diameter cylindrical portion 86 of the case 83 and the winding body portion 71 of the coil bobbin 70.

The plunger 80 is formed into a substantially cylindrical shape, and the shaft 57 is inserted into a through hole 81 extending along the central axis, and is fixed by caulking. Further, when the attraction coil 77 and the holding coil 78 are excited, the plunger 80 slides inside the guide pipe 48 and rises, the upper end surface 58 comes into contact with the pin 50, and the pin 50 is further pushed up. The lower portion of the return coil spring 56 is inserted into the spring receiving recess 82 of the plunger 80 . As described above, the shaft 57 is fixed to the plunger 80 and moves up and down together with the plunger. In addition, a lower portion of the shaft 57 always protrudes to the outside through the opening 85 of the case 83 in order to push in a control rack (not shown) and rotate the control pinion toward the fuel cutoff side. Further, the upper portion projects upward from the spring receiving recess 82. The return coil spring 56 has an upper end in contact with the spring seat 29 of the base 20 shown in FIG. A pressing elastic force is constantly exerted on the bottom surface of the spring receiving recess 82. The fixing member 68 is for attaching the solenoid 10 to a diesel engine body (not shown), and bolts are inserted into the openings of the first fixing collar 68a and the second fixing collar 68b shown in FIG. and is fixed to the diesel engine body. Note that when the solenoid 10 is used for other purposes, for example when there is no need to push the control rack, the shaft may not be provided and the plunger may push up the pin 50.

The base 20 is a fixed magnetic pole that attracts the plunger 80, and as shown in FIG. 1, includes a main body portion 21 formed in a substantially cylindrical shape and a fixing flange portion 22 formed in a substantially disc shape. ing. The main body part 21 is formed in a short, substantially cylindrical shape extending along the central axis, and the base end side is integrated with the fixing flange part 22, and the distal end side projects downward. Further, the main body section 21 is inserted into the winding drum section 71 of the coil bobbin 70, and a part of the tip side is inserted into the guide pipe 48. Further, as shown in FIG. 2, the main body portion 21 has a through hole 24 formed in the center and extending along the central axis. The through hole 24 serves as a space for the pin 50 to move up and down, and also serves as a space for storing the lower packing 40, the upper packing 41, and the spacer ring 42. In addition, in order to prevent the lower packing 40 from moving downward and detaching from the spacer ring 42 side as the pin 50 moves up and down, the through hole 24 has a lower diameter inner peripheral surface 25 at the lower end. An annular protrusion 23 having a diameter smaller than the side packing 40 is formed. Furthermore, as described above, the spring seat portion 29 that serves as a spring holder for the return coil spring 56 is formed on the lower surface of the main body portion 21 . Although the spring seat portion 29 is formed as a concave portion, it may be conversely formed as a convex portion. The shape etc. of this convex portion may be appropriately set according to the characteristics of the return coil spring 56.

Further, in the base 20, the contact chamber constituent member 30 is arranged so that the upper surface 22a of the fixing flange portion 22 and the lower surface 31a of the contact chamber base portion 31 are in contact with each other. With this arrangement, as shown in FIG. 2, the pin 50 is raised and lowered by the through hole 24 of the base 20 and the large-diameter storage through-hole 37 and the small-diameter storage through-hole 38 of the contact chamber component 30. I'm trying to organize the space that I want to use. Further, a recessed portion 28 is formed on the upper surface 22a of the fixing flange portion 22. In addition, the concave portion 28 is provided with a restraining plate 45 sized to be in contact with the bottom surface 26 and the vertical surface 27 and formed in a disk shape. As shown in FIG. 3, the restraining plate 45 restricts the descent of the pin 50 by coming into contact with the flange portion 53 of the pin 50 that is descending, that is, it defines the limit of the descent of the pin 50. Moreover, the stroke length of the pin 50 can be adjusted by appropriately adjusting the thickness of the holding plate 45. As will be described later, when the flange portion 53 is replaced with an E-shaped retaining ring, the pin 50 is stopped by the retaining plate 45 coming into contact with the E-shaped retaining ring of the lowered pin 50. The decline will be regulated.

The contact chamber constituent member 30 is made of resin, and as shown in FIGS. 1 and 3, includes a contact chamber base portion 31 that constitutes the contact chamber 19, a fixing portion 32 fixed to the large diameter cylindrical portion 88 of the case 83, A cylindrical side wall portion 33 that receives the lid 79, a lower protrusion 34 that presses and holds the restraining plate 45 from above, an upper protrusion 35 that forms a space for storing the pin 50 and the auxiliary coil spring 46; A spring receiving portion 36 is provided. The contact chamber base part 31 is formed into a substantially disk shape, and as shown in FIG. 3, a large-diameter storage through-hole 37 and a small-diameter storage through-hole 38 are provided in the center and extend along the central axis. It is formed. The fixing part 32 extends downward from the contact chamber base part 31 and is formed in a substantially cylindrical shape. Furthermore, the fixed part 32 has a larger diameter than the large diameter cylindrical part 88 of the case 83, and is fixed with the upper part of the large diameter cylindrical part 88 inserted inside. The cylindrical side wall portion 33 extends upward from the contact chamber base portion 31 and is formed in a substantially cylindrical shape. Further, the cylindrical side wall portion 33 is formed so as to be thin so as to form a step on the inside near the upper end portion, and is formed to mesh with the lid 79.

The large-diameter through hole 37 for storage is formed from the contact chamber base part 31 to the lower protrusion part 34, and in order to secure a space in which the flange part 53 of the pin 50 can be raised and lowered, the flange part 53 is The diameter is larger than the outer diameter of the The small diameter through hole 38 for storage is formed from the contact chamber base part 31 to the upper protrusion part 35, and has a diameter suitable for storing the upper main body part 54 of the pin 50 and the auxiliary coil spring 46. It is formed. Further, the diameter of the large-diameter storage through-hole 38 is smaller than the diameter of the flange portion 53 so that the flange portion 53 of the pin 50 does not separate into the small-diameter storage through-hole 38 . The spring receiving part 36 is a part that serves as a spring support for the upper end of the auxiliary coil spring 46, and the diameter of the inner peripheral surface 36a is set to the diameter of the auxiliary coil spring 46 so that the auxiliary coil spring 46 does not come off upward. It is designed to be smaller than the The step surface 39 between the large-diameter through-hole for storage 37 and the small-diameter through-hole for storage 38 restricts the rise of the pin 50 by contacting the flange portion 53 of the rising pin 50, that is, the rise of the pin 50. It stipulates limits. Further, instead of the configuration in which the pin 50 is provided with the flange portion 53, an E-shaped retaining ring may be fixed to a portion forming the flange portion 53 in the direction of the central axis, that is, a portion near the intermediate portion. Note that this E-type retaining ring must have a diameter that does not come off inside the small-diameter through hole 38 for storage.

As described above, the pin 50 moves up and down inside the storage space formed by the through hole 24 of the base 20 and the large-diameter storage through-hole 37 and the small-diameter storage through-hole 38 of the contact chamber component 30. It is set in. That is, when the shaft 57 rises and the pin 50 is pushed up with the upper end surface 58 of the shaft 57 in contact with the lower end surface 52 of the pin 50, the leaf spring 63 comes into contact with the upper end surface 55, and further The pin 50 presses and bends the leaf spring 63. Further, the pin 50 is provided with a flange portion 53 between the lower main body portion 51 and the upper main body portion 54, and, as described above, serves to set the length of the vertical stroke. The lower packing 40 and the upper packing 41 are airtight materials having a substantially Y-shaped or substantially U-shaped cross section, for example, and are provided so as to surround the lower main body portion 51 of the pin 50. It has the role of sealing the chamber 19 from liquids such as lubricating oil and water, as well as from dust. Note that an O-ring or a square ring may be used for either or both of the lower packing 40 and the upper packing 41 depending on conditions such as the diameter of the through hole 24.

As shown in FIG. 7, the contact chamber 19 supports a movable contact 61 and a fixed contact 62 of a switch 60 that turns on or off the attraction coil 77, and a movable contact 61 that can be raised and lowered, and also includes a movable contact 61 and a suction coil. 77, a conductive member 64 that forms a part of the conductive path between the fixed contact 62 and the attraction coil 77, a conductive member 64 that fixes the base end of the leaf spring 63, and A wiring through-hole 69a for introducing the conductive/fixing member 65 that forms part of the conductive path between the spring 63 and the attraction coil 77 and the coil wires 66a and 66b that are near the ends of the coil bobbin 70 into the contact chamber 19. and 69c, and wiring through holes 69b and 69d for leading out the lead wires 67a and 67b from the contact chamber 19 are arranged. Note that the wiring through holes 69a, 69b, 69c, and 69d, which serve as routes for leading out from the lead wire side to the contact chamber 19 side, penetrate not only the contact chamber base portion 31 but also the fixing flange portion 22 of the base 20. ing. Furthermore, as described above, the large diameter through hole 37 for storage and the small diameter through hole 38 for storage are formed in the contact chamber base portion 31 of the contact chamber component 30, so that they basically communicate with the plunger 80 side. However, since the lower packing 40 and the upper packing 41 are provided, it is possible to prevent lubricating oil, dew condensation, etc. from entering the contact chamber 19.

Next, an overview of the operation of the solenoid 10 according to the first embodiment of the present invention will be described. FIG. 4 is a sectional view of the solenoid in the energized state according to the first embodiment of the present invention. All the symbols used in FIG. 4 indicate the same ones as in FIG. 1. Furthermore, FIG. 5 is a partially enlarged cross-sectional view of the pin and its surroundings in the energized state of the solenoid according to the first embodiment of the present invention. All the symbols used in FIG. 5 indicate the same ones as in FIG. 1.

When the attraction coil 77 and the holding coil 78 are energized, a magnetic field that attracts the plunger 80 toward the base 20 is generated by excitation. The plunger 80 rises toward the base 20, and as shown in FIG. Push up. Then, the pin 50 stops when the plunger 80 comes into contact with the main body 21 of the base 20. As shown in FIG. 5, before the flange portion 53 comes into contact with the step surface 39, the upper end surface 55 of the pin 50 comes into contact with the leaf spring 63 and presses and bends the leaf spring 63, so that the movable contact 61 moves away from the fixed contact 62. When they are separated, the switch 60 is turned off. When the switch 60 is turned off, the plunger 80 is held raised toward the base 20 only by the magnetic field generated by the holding coil 78. Although not shown, when the shaft 57 rises, the control rack of the fuel pump moves to the fuel injection side, making the engine ready for operation. Therefore, while the holding coil 78 is energized, the diesel engine continues to be operable.

Next, solenoids according to second and third embodiments of the present invention will be described. FIG. 8 is a partially enlarged sectional view of the pin and its surroundings in a non-energized state of the solenoid according to the second embodiment of the present invention. In FIG. 8, 11 is a solenoid and grease 43, and other symbols are the same as in FIG. 2. Further, FIG. 9 is a partially enlarged sectional view of the pin and its surroundings in a non-energized state of the solenoid according to the third embodiment of the present invention. In FIG. 9, 12 is a solenoid, 44 is a single packing, 90 is a base, 91 is a main body part, 92 is a fixing flange part, 22a is an upper surface, 93 is an annular protrusion part, 94 is a through hole, 95 is an inner peripheral surface, 96 is a bottom surface, 97 is a vertical surface, 98 is a recessed portion, 99 is a spring seat portion, and other symbols are the same as in FIG. 2.

In the solenoid 11 according to the second embodiment of the present invention, grease 43 is injected into a gap surrounded by a lower packing 40, an upper packing 41, and a spacer ring 42. The other configurations are the same as the solenoid 10. With this configuration, the grease 43 adheres to the circumferential surface of the lower main body portion 51 of the pin 50, further improving the sealing performance against liquids and dust. Further, as shown in FIG. 9, the solenoid 12 according to the third embodiment of the present invention has a substantially Y-shaped cross section or A substantially U-shaped single packing 44 is provided. Further, the through hole 94 formed in the center of the main body portion 91 of the base 90 is formed to have an optimal length for storing the single packing 44 so that the single packing 44 will not be displaced. That is, in the direction of the central axis, the diameter of the through hole 94 is increased only in the vicinity of the upper single packing 44 so that the inner circumferential surface 95 functions as a sliding guide surface for the pin 50, and the annular protrusion 93 is longer than the annular protrusion 23 of the base 20. In addition, the recessed part 98 and the spring seat part 99 which consist of the fixing flange part 92, the upper surface 92a, the bottom surface 96, and the vertical surface 97 of the base 90 are connected to the fixing flange part 22, the upper surface 22a, the bottom surface 26, and the vertical surface of the base 20. It has the same shape as the concave portion 28 consisting of the surface 27 and the spring seat portion 29. The other configurations are the same as the solenoid 10. The solenoid 12 has a somewhat inferior sealing performance against liquid and dust compared to the solenoid 10, but in cases where the sealing performance of only the single packing 44 is sufficient, such as when the temperature change in the atmosphere of a diesel engine is small, the manufacturing cost of the solenoid can be reduced. This can be said to be a preferred embodiment from the viewpoint of

As described above, in the solenoids 10 to 12, the shaft 57 fixed to the plunger 80 pushes up the pin 50, and the pin 50 presses and bends the leaf spring 63 supporting the movable contact 61 of the switch 60. However, since the pin 50 is inserted through the lower packing 40 and upper packing 41 provided in the through hole 24 or the single packing 44, no lubricating oil, water, etc. can enter the contact chamber 19. Infiltration is prevented by the lower packing 40 and the upper packing 41 or by the single packing 44. Further, when the shaft 57 is in contact with the pin 50, the pin 50 moves in conjunction with the sliding movement of the plunger 80, so it is very easy to ensure the necessary and sufficient stroke length of the pin 50. Further, since the holding coil 78 operates with a current as low as necessary to hold the plunger 80 in the suction position, the holding coil 78 can be safely operated without burning out even if the current is continuously applied. Furthermore, by providing the lower packing 40 and the upper packing 41 in the solenoids 10 and 11, it is possible to more reliably prevent lubricating oil and the like from entering the contact chamber 19. Furthermore, since the solenoids 10 and 11 are provided with the spacer ring 42, it is possible to suppress the position of the lower packing 40 or the upper packing 41 from shifting due to repeated sliding of the pin 50. Furthermore, according to the solenoid 11, the grease 43 can more reliably prevent lubricating oil and the like from entering the contact chamber 19. In addition, in the solenoids 10 to 12, the annular protrusion 23 is provided near the lower end of the through hole 24 of the base 20, so that the pin 50 repeatedly slides to remove the lower packing 40, the upper packing 41, or , it is possible to prevent the single packing 44 from coming off to the outside of the through hole 24 . In addition, in the solenoids 10 to 12, the downward sliding of the pin 50 can be restricted by the restraining plate 45, and the stroke of the pin 50 can be lengthened or shortened by adjusting the thickness of the restraining plate 45. Both adjustments can be made easily.

The present invention is not limited to what has been described above; for example, the upwardly protruding portion of the plunger pushes up the pin instead of the externally projecting shaft pushing up the pin, as described in each claim. Various configurations are possible as long as they do not deviate from the above range.

10 Solenoid 11 Solenoid 12 Solenoid 19 Contact chamber 20 Base 21 Main body portion 22 Fixing flange portion 22a Top surface 23 Annular protrusion 24 Through hole 25 Inner peripheral surface 26 Bottom surface 27 Vertical surface 28 Recessed portion 29 Spring seat portion 30 Contact chamber constituent member 31 Contact chamber base portion 31a Lower surface 32 Fixing portion 33 Cylindrical side wall portion 34 Lower protrusion 35 Upper protrusion 36 Spring receiving portion 36a Inner peripheral surface 37 Large diameter through hole for storage 38 Small diameter through hole for storage 39 Step surface 40 Lower side Packing 41 Upper packing 42 Spacer ring 43 Grease 44 Single packing 45 Holding plate 46 Auxiliary coil spring 47 O-ring 48 Guide pipe 49 O-ring 50 Pin 51 Lower main body 52 Lower end face 53 Flange 54 Upper main body 55 Upper end face 56 Return coil spring 57 Shaft 58 Upper end surface 59 Spacer 60 Switch 61 Movable contact 62 Fixed contact 63 Leaf spring 64 Conductive member 65 Conductive and fixed member 66a Coil wire 66b Coil wire 67a Lead wire 67b Lead wire 68 Fixed member 68a First fixation Flange 68b Second fixed collar 69a Wiring through hole 69b Wiring through hole 69c Wiring through hole 69d Wiring through hole 70 Coil bobbin 71 Winding trunk 72 First flange 73 Second flange 74 Third flange Part 75 Fourth flange part 76a Notch part 76b Notch part 77 Attraction coil 78 Holding coil 79 Lid 80 Plunger 81 Through hole 82 Spring receiver recessed part 83 Case 84 Bottom plate part 85 Opening part 86 Small diameter cylindrical part 87 Step part 88 Large Diameter cylindrical portion 89 Bending portion 90 Base 91 Main body portion 92 Fixing flange portion 22a Upper surface 93 Annular protrusion 94 Through hole 95 Inner peripheral surface 96 Bottom surface 97 Vertical surface 98 Recessed portion 99 Spring seat portion 100 Solenoid 110 Contact assembly 111 Movable contact 112 Fixed contact 113 Movable contact 114 Fixed contact 115 Contact spring 116 Diaphragm 117 Terminal base 118 Accommodation recess 119 Yoke 120 Accommodation recess 121 Plunger 122 Connection shaft 123 Housing 124 Coil bobbin 125 Coil 126 Return spring 127 Mold part 128 Communication hole

Claims (7)

A base in which a through hole extending along the central axis is formed in the center;
a contact chamber constituent member that is arranged so as to be in contact with the upper surface of the base, and has a through hole formed in the center that extends along the central axis and connects to the through hole of the base;
a fixed contact fixed to the contact chamber constituent member; a plate spring whose proximal end side is fixed to the contact chamber constituent member; and a plate spring provided on the distal end side of the plate spring so as to face the fixed contact. and a switch including a movable contact that is capable of coming into contact with and separating from the fixed contact;
a coil electrically connected to the switch;
The switch is provided inside the through hole of the base and the through hole of the contact chamber constituent member so as to be slidable along the central axis, and presses the leaf spring of the switch when raised. a pin bent to separate the movable contact from the fixed contact;
a packing formed in a substantially annular shape, provided inside the through hole of the base, and into which the pin is inserted;
A solenoid having a plunger that is slidably provided along the central axis and is attracted to the base when the coil is energized,
When the coil is energized, the plunger slides toward the base, so that the plunger or a shaft fixed to the plunger pushes up the pin, and the pin pushes the leaf spring of the switch. A solenoid characterized in that the movable contact is separated from the fixed contact by pressing and bending. Claim 1, further comprising another packing formed in a substantially annular shape, provided inside the through hole of the base and above the packing, and into which the pin is inserted. The solenoid described in . Claim further comprising a spacer ring formed in a substantially annular shape, provided inside the through hole of the base, and arranged to be interposed between the packing and the other packing. The solenoid according to item 2. The solenoid according to claim 3, further comprising grease provided in a gap surrounded by the packing, the other packing, and the spacer ring. 5. The base is formed such that an inner diameter of a portion near a lower end of the through hole is smaller than an outer diameter of the packing. solenoid. The pin has a main body formed in a substantially cylindrical shape and extending along the central axis, and a flange projecting in a direction perpendicular to the central axis near the intermediate portion in the direction of the central axis. Equipped with a department,
The base has a substantially circular recess formed in the center of the upper surface and has a larger diameter than the through hole,
disposed in the concave portion of the base, has a substantially annular plate shape, has an outer diameter larger than the through hole of the base, and has a larger inner diameter than the main body of the pin; According to any one of claims 1 to 5, further comprising a restraining plate formed to be smaller than the flange portion and inserted below the flange portion of the pin. Solenoid. The pin has a main body having a substantially cylindrical shape and extending along the central axis, and includes an E-shaped retaining ring fixed to a portion near the intermediate portion in the direction of the central axis,
The base has a substantially circular recess formed in the center of the upper surface and has a larger diameter than the through hole,
disposed in the concave portion of the base, has a substantially annular plate shape, has an outer diameter larger than the through hole of the base, and has a larger inner diameter than the main body of the pin; Any one of claims 1 to 5, further comprising a restraining plate formed to be smaller than the E-shaped retaining ring and into which the pin is inserted below the E-shaped retaining ring. The solenoid described in paragraph 1.

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