JP2014119045A - Electromagnetic valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic valve which can be downsized without inviting a decrease in magnetic efficiency.SOLUTION: A proximal end side of a shaft part 63 in which a plunger 61 is inserted is composed of a large diameter part 71 and a distal end side is composed of a small diameter part 72, and a step surface 73 is formed between the large diameter part 71 and the small diameter part 72. The step surface 73 is abutted to a proximal end surface 81 of the plunger 61 on a yoke 56 side. The small diameter part 72 extending to an end side of the plunger 61 is supported by a core side bearing 91 engaged inside the core 54, and the large diameter part 71 extending to the proximal end side is supported by a yoke side bearing 101 engaged inside the yoke 56. A groove 111 is formed on a peripheral surface of the yoke side bearing 101 of large size, and a plunger chamber 112 and a space 113 on the proximal end side are communicated by the groove 111 to form a breathing path 114 for allowing oil to flow.

Description

  The present invention relates to an electromagnetic valve used in, for example, a hydraulic circuit.

  Conventionally, a drive unit is provided in a solenoid valve body of a solenoid valve (for example, Patent Document 1).

  As such an electromagnetic valve 801, as shown in FIG. 2, an electromagnetic valve body 802 and a nozzle portion 803 are known, and the nozzle portion 803 is a spool type in which a spool 804 is accommodated. It has been known.

  The solenoid valve body 802 accommodates a solenoid 813 in which a coil 812 is wound around a bobbin 811, and a core 814 that is excited by the solenoid 813 is accommodated in the solenoid 813. A yoke 816 is connected to the tip of the core 814 via a connecting pipe 815, and a plunger 817 is accommodated between the core 814 and the yoke 816.

  A straight-shaped pin 821 passes through the plunger 817, and the portion of the pin 821 that extends from the plunger 817 toward the core 814 is supported by the core 814 via a core-side bearing 822. Has been. Further, the portion of the pin 821 extending from the plunger 817 toward the yoke 816 is supported by the yoke 816 via a yoke-side bearing 823, and the core-side bearing 822 and the yoke-side bearing 823 are supported. Are formed in the same shape.

  In such a structure, when the plunger 817 moves, a hydraulic damping force is generated due to a volume change eliminated by the plunger 817. For this reason, in order not to obstruct the movement of the plunger 817, grooves 831 and 831 are provided on the side surface of the yoke-side bearing 823 arranged on the back side to form a breathing path through which oil flows.

JP 2010-135469 A

  However, when downsizing the conventional solenoid valve 801, it is necessary to reduce the sizes of the bearings 822 and 823 from the viewpoint of magnetic efficiency.

  In this case, it becomes difficult to set the grooves 831 and 831 on the side surface of the yoke-side bearing 823.

  For this reason, as shown in FIG. 3, an electromagnetic valve 852 in which a breathing path 851 is provided in the magnetic circuit is conceivable.

  However, in such a case, the magnetic circuit becomes large and the cost increases.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide an electromagnetic valve that can be miniaturized without causing a decrease in magnetic efficiency. .

  In order to solve the above-mentioned problem, in the electromagnetic valve according to claim 1 of the present invention, in the electromagnetic valve in which both end portions of the shaft portion penetrating the plunger constituting the electromagnetic portion are supported via bearings, the shaft The one side of the part is composed of a large diameter part, the other side is composed of a small diameter part smaller in diameter than the large diameter part, and the shaft part has a stepped shape, and a bearing that supports the large diameter part and the small diameter part The bearings supporting the body were set to different sizes, and a breathing path was formed on the bearings set to a large size.

  That is, one side of the shaft portion that penetrates the plunger is configured with a large diameter portion, and the other side is configured with a small diameter portion, and the bearing that supports the large diameter portion is larger than the bearing that supports the small diameter portion. The diameter is set. For this reason, it becomes easy to form a respiratory path to the bearing formed with a large diameter.

  On the other hand, the other side of the shaft portion is constituted by a small diameter portion, and the electromagnetic portion can be miniaturized. Moreover, since the diameter of the shaft portion and the bearing is small, a decrease in magnetic efficiency acting on the plunger is also prevented.

  According to a second aspect of the present invention, the size of the bearing disposed on the back side of the electromagnetic unit is set larger than that on the near side bearing, and a groove is set on the side surface of the back side bearing so that the breathing path is formed. Formed.

  Thereby, in the electromagnetic part formed in the bag shape, hydraulic damping due to a volume change that occurs during operation in the inner space of the plunger is suppressed.

  On the other hand, the annular gap can be reduced by reducing the size of the bearing on the front side of the electromagnetic part. This prevents contamination from entering from the near side.

  Moreover, when the core which attracts | sucks the said plunger is provided in the near side from the said plunger, since the diameter of the axial part extended to the said near side is small, the increase in a core suction area is achieved.

  Further, in the electromagnetic valve according to claim 3, the bearing is composed of a core side bearing provided on the core side for attracting the plunger, and a yoke side bearing provided on the yoke side. One side of the shaft portion to be supported was set to have a larger diameter than the other side, a step surface was formed on the shaft portion, and the step surface was brought into contact with the end surface of the plunger located on the yoke side.

  That is, when the plunger is sucked and brought into contact with the core, a pulling load toward the yoke side acts on the plunger.

  At this time, a step surface is formed on the shaft portion, and the step surface is in contact with the plunger end surface located on the yoke side.

  For this reason, even if the removal load is applied, inadvertent displacement of the plunger is prevented.

  As described above, in the solenoid valve according to the first aspect of the present invention, one side of the shaft portion penetrating the plunger is constituted by the large diameter portion, and the other side is constituted by the small diameter portion. The bearing that supports the diameter portion is set to have a larger diameter than the bearing that supports the small diameter portion. For this reason, it becomes easy to form a respiratory path to the bearing formed with a large diameter.

  On the other hand, the other side of the shaft portion is constituted by a small diameter portion, and the electromagnetic portion can be miniaturized. Moreover, since the diameters of the shaft portion and the bearing are small, it is possible to prevent a decrease in magnetic efficiency acting on the plunger. As a result, the size can be reduced without causing a decrease in magnetic efficiency.

  Therefore, as compared with the conventional case using the shaft portion formed to have the same diameter over the entire length, the small diameter portion can be reduced in size without causing a decrease in magnetic efficiency. In addition, on the large-diameter portion side, the breathing path can be secured without providing a breathing path in the magnetic circuit, and the occurrence of hydraulic damping can be prevented. Thereby, the cost increase by the enlargement of a magnetic circuit can be prevented.

  In the electromagnetic valve according to the second aspect, the size of the bearing disposed on the back side of the electromagnetic unit is set larger than that on the near side bearing, and a groove is provided on the side surface of the back side bearing to form a respiratory path.

  For this reason, in the electromagnetic part formed in the bag shape, it is possible to suppress hydraulic damping due to a volume change that occurs during operation in the inner space of the plunger.

  On the other hand, by reducing the size of the bearing on the front side of the electromagnetic part, the annular gap can be reduced, and contamination can be prevented from entering from the front side.

  In addition, when a core for attracting the plunger is provided on the near side of the plunger, the diameter of the shaft portion extending to the near side is small, so that the core attracting area can be increased and the magnetic efficiency can be increased. Can be increased.

  Furthermore, in the electromagnetic valve according to claim 3, a step surface is formed on the shaft portion, and the step surface is in contact with the plunger end surface located on the yoke side.

  For this reason, when the plunger is attracted by the core and brought into contact with the plunger, even if a pull-out load toward the yoke acts on the plunger, the plunger is inadvertently displaced. It can be blocked by the step surface.

It is sectional drawing which shows one embodiment of this invention. It is sectional drawing which shows the conventional solenoid valve. It is sectional drawing which shows another prior art example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing an electromagnetic valve 1 according to the present embodiment, and the electromagnetic valve 1 is used in an automatic transmission of an automobile.

  The electromagnetic valve 1 includes an electromagnetic valve main body 11 that constitutes an electromagnetic part, and the electromagnetic valve main body 11 is provided with a nozzle 12 that extends to the distal end side.

  In the nozzle 12, a flange portion 21 provided at the base end is fixed to the electromagnetic valve main body 11 by a caulking portion 23 provided at the casing 22 end portion of the electromagnetic valve main body 11. The nozzle 12 is formed in a cylindrical shape, and a plurality of ports 24,.

  A spool 31 is accommodated in the nozzle 12, and the spool 31 is held movably in the axial direction. The spool 31 includes a cylindrical portion 32 and a plurality of valve portions 33,... Having a larger diameter than the cylindrical portion 32, and the valve portions 33 are moved by the spool 31 moving in the axial direction. ,... Are configured to open and close the corresponding ports 24,.

  A plug member 41 is inserted at the front end of the nozzle 12, and a coil spring 42 is held between the plug member 41 and the spool 31. Thereby, the spool 31 is urged toward the base end side.

  In the casing 22 of the electromagnetic valve main body 11, a solenoid 53 is accommodated in which a coil 52 is wound around a bobbin 51. In the solenoid 53, a core 54 excited by the solenoid 53 is accommodated on the front end side, which is the front side, and a yoke 56 is connected to the end of the core 54 via a connecting pipe 55. ing.

  A plunger 61 is accommodated between the core 54 and the yoke 56, and is fixed in a state where a cylindrical shaft portion 63 is inserted into a circular hole 62 that passes through the plunger 61. . The distal end portion of the shaft portion 63 extends into the nozzle 12, and the distal end of the shaft portion 63 is configured to contact the base end of the cylindrical portion 32 of the spool 31.

  Thus, when the solenoid 53 is energized and the core 54 is excited, the plunger 61 is attracted by the core 54 and comes into contact with a stopper 66 provided on the suction surface 65 of the core 54. It is comprised so that the said spool 31 can be moved to the front end side, when the said axial part 63 extended from the said plunger 61 is moved to the front end side.

  The shaft portion 63 includes a large-diameter portion 71 that constitutes a proximal end that is one side, and a small-diameter portion 72 that constitutes a distal-end side that is the other side, and the small-diameter portion 72 includes the large-diameter portion 72. The outer diameter dimension is smaller than that of the portion 71. Accordingly, the shaft portion 63 is formed in a stepped shape, and a step surface 73 is formed between the large diameter portion 71 and the small diameter portion 72.

  The circular hole 62 of the plunger 61 is formed in a size that allows the small diameter portion 72 of the shaft portion 63 to be inserted, and the stepped surface 73 is inserted with the small diameter portion 72 inserted into the circular hole 62. Is inserted so as to come into contact with the base end surface 81 of the plunger 61 located on the yoke 56 side. In this contact state, the distal end surface 82 of the plunger 61 is crimped at the outer peripheral portion of the extended portion where the small diameter portion 72 extends, and the stepped surface 73 of the shaft portion 63 is the base end surface. The movement toward the distal end side is prevented by abutting against 81, and the movement toward the proximal end side is inhibited by caulking the distal end surface 82.

  The shaft portion 63 extending from the plunger 61 is slidably supported via a bearing, and the plunger 61 is supported to be movable in the length direction of the shaft portion 63.

  More specifically, the small-diameter portion 72 extending to the tip side from the plunger 61 is supported by the core 54 via a core-side bearing 91 fitted in the core 54, and the small-diameter portion 72 is supported movably in the length direction. The inner diameter dimension of the core side bearing 91 is set to a size that allows the small diameter portion 72 to be inserted, and the outer diameter dimension is set in accordance with the inner diameter dimension.

  The large-diameter portion 71 extending from the plunger 61 to the proximal end side is supported by the yoke 56 via a yoke-side bearing 101 fitted in the yoke 56, and the large-diameter portion 71. Is supported movably in the length direction. The inner diameter of the yoke-side bearing 101 is set to a size that allows the large-diameter portion 71 to be inserted, and the outer diameter is set in accordance with the inner diameter.

  Thereby, the yoke-side bearing 101 that supports the large-diameter portion 71 and the core-side bearing 91 that supports the small-diameter portion 72 are set to different sizes, and the core-side bearing formed to have a large diameter is used. A bearing 91 is disposed on the proximal end side which is the back side of the electromagnetic valve main body 11.

  Grooves 111, 111 penetrating from the base end side to the tip end side are formed in two places on the peripheral surface of the large-sized yoke-side bearing 101 arranged on the base end side. Breathing paths 114 and 114 are formed to allow the oil to flow through the plunger chamber 112 on the distal end side of the yoke-side bearing 101 and the space 113 on the proximal end side.

  In the present embodiment according to the above configuration, the base end side of the shaft portion 63 penetrating the plunger 61 is configured by the large diameter portion 71, and the distal end side is configured by the small diameter portion 72. The yoke-side bearing 101 that supports the shaft is set to have a larger diameter than the core-side bearing 91 that supports the small-diameter portion 72. For this reason, it becomes easy to form the breathing paths 114 and 114 to the yoke-side bearing 101 having a large diameter.

  On the other hand, the distal end side of the shaft portion 63 is constituted by the small diameter portion 72, and the electromagnetic valve body 11 can be downsized. Further, since the diameters of the shaft portion 63 and the core-side bearing 91 are small, it is possible to suppress a decrease in the attracting surface 65 of the core 54 and to prevent a decrease in magnetic efficiency acting on the plunger 61. As a result, the size can be reduced without causing a decrease in magnetic efficiency.

  Therefore, as compared with the conventional case using the shaft portion 63 formed to have the same diameter over the entire length, the small diameter portion 72 can be miniaturized without causing a decrease in magnetic efficiency. Further, on the large diameter portion 71 side, the breathing paths 114, 114 can be secured without providing a breathing path in the magnetic circuit, and the occurrence of hydraulic damping can be prevented. Thereby, the cost increase by the enlargement of a magnetic circuit can be prevented.

  Further, in the present embodiment, the size of the yoke-side bearing 101 disposed on the back side, which is the base end side of the solenoid valve main body 11 formed in a bag path shape, is larger than the size of the core-side bearing on the front side, which is the front end side. The breathing paths 114 and 114 were formed by setting the grooves 111 and 111 on the peripheral surface of the yoke-side bearing 101 on the back side.

  For this reason, in the plunger chamber 112, it is possible to suppress hydraulic damping due to a volume change that occurs during operation in the inner space of the plunger 61.

  On the other hand, by reducing the size of the core side bearing 91 on the front side, which is the front end side of the solenoid valve body 11, the annular gap can be reduced and contamination can be prevented from entering from the spool 31 side which is the front side. can do.

  Further, a core 54 that sucks the plunger 61 is provided on the front side, which is the front end side from the plunger 61, and the diameter of the shaft portion 63 extending to the front side is small, so that the core suction area is increased. Can increase the magnetic efficiency.

  A step surface 73 is formed on the shaft portion 63, and the step surface 73 is in contact with the end surface of the plunger 61 located on the yoke 101 side.

  At this time, when the plunger 61 is sucked by the core 54 and brought into contact with the stopper 66, a pulling load toward the yoke 101 acts on the plunger 61.

  However, since the step surface 73 formed on the shaft portion 63 contacts the end surface of the plunger 61 on the yoke 56 side, the step surface 73 prevents inadvertent displacement of the plunger 61. be able to.

DESCRIPTION OF SYMBOLS 1 Solenoid valve 11 Solenoid valve main body 54 Core 56 Yoke 61 Plunger 63 Shaft part 71 Large diameter part 72 Small diameter part 73 Step surface 81 Base end surface 91 Core side bearing 101 Yoke side bearing 111 Groove 114 Breathing path

Claims (3)

In the solenoid valve in which both end portions of the shaft portion penetrating the plunger constituting the electromagnetic portion are supported via bearings,
The shaft portion is configured with a large-diameter portion and the other side is configured with a small-diameter portion having a smaller diameter than the large-diameter portion so that the shaft portion has a stepped shape, and the bearing that supports the large-diameter portion and the An electromagnetic valve characterized in that a bearing for supporting a small-diameter portion is set to a different size, and a breathing path is formed in a bearing set to a large size.   The size of a bearing disposed on the back side of the electromagnetic unit is set larger than that on the near side bearing, and a groove is set on a side surface of the back side bearing to form the breathing path. Solenoid valve.   The bearing comprises a core side bearing provided on the core side for sucking the plunger, and a yoke side bearing provided on the yoke side, and one side of the shaft portion supported by the yoke side bearing is provided. 3. The step according to claim 1, wherein a step surface is formed on the shaft portion with a larger diameter than the other side, and the step surface is brought into contact with an end surface of the plunger located on the yoke side. solenoid valve.

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