JPS6140121B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the armature cavity is formed by connecting a magnetic base and a magnetic pole with a non-magnetic intermediate sleeve, and the compression effect of the electric coil winding wound on the sleeve is reduced. The present invention relates to an axial type solenoid in which the magnetic pole, sleeve and base are held assembled without welding or screwing. In this solenoid construction, the non-ferrous or non-magnetic sleeve consists of a section of low-cost tubing that is precisely cut to a given length.
A certain air gap is formed between the magnetic pole and the base of the magnetic material.

The base and pole are nested in a fitting relationship within opposite ends of the sleeve. The electrically biasing coil has a winding wound to create tension on the outer surface of the sleeve. To this end, the sleeve interfits with the base and poles in a nested manner to bond these parts together, to provide effective transfer of thermal energy, and to create a strong mechanical connection or joint between each part. Form.

The present invention eliminates the previously known coil frame around which the windings are wound and provides a solenoid structure that can be used with known methods, ie dry plungers.
The compressive action of the sleeve with nested portions of the base and pole results in joining these parts together into a one-piece bobbin structure characterized by effective heat transfer and great strength. This structure is particularly suitable for proportional solenoids, i.e., solenoids in which the axially extending portion of the tapered magnetic pole is selectively saturated by the movement of a cylindrical armature that is in an overlapping or nested relationship with the magnetic pole as shown in the drawing. It can be advantageously used in the production of.

A solenoid specifically for use in dry conditions is disclosed in FIGS. 1 and 2. Case 110 is formed from iron or magnetic material and has a forward mounting flange 111 at its open end.

The coil or spool assembly 112 consists primarily of three
three separate parts or base 114, a hub or pole 115, and a tubular spacer or sleeve 116.
It is made up of Base 114 and magnetic pole 115 are formed from ferrous material. Non-magnetic coupling sleeve 1
16 is formed from tubing that is precisely cut to the desired length. This sleeve forms a space between the pole and the base, which is the magnetically active air gap 116b. Sleeve 116, which has an inner diameter that provides a sliding fit over each cylindrical portion 114a and 115a of adjacent magnetic or flux-forming sections, may be made of low cost aluminum or brass tubing. Conventional seals may be used in areas where contamination by dust, fluids, or other foreign matter is expected;
25 need not be sealed fluid-tight. The end cap 125 may simply be press-fit into the open end of the case 110 and may be formed from either magnetic or non-magnetic materials depending on the desired characteristics of the solenoid of the present invention.

A cylindrical armature 120 is supported at its inner end on a sleeve bearing 128.
This bearing 128 has an armature 12 on the inner side.
0, and its outer surface side has a close sliding fit relationship with the inner diameter of the cylindrical portion 114a of the base 114. Bearing 128 may be formed from a porous sintered bearing metal, such as bronze, and may be suitably impregnated with a desired lubricant. A second sleeve bearing 129, preferably formed from the same material as bearing 128, is supported within shank 125a of end cap 125 to support shaft 1.
22 in a slidable manner, and as a result, amateur 1
20 is guided at one end by a bearing 128 and at the opposite end by a bearing 129 via a shaft 122.

The windings of electrical coil 150 are wound in direct engagement with the outer surface of sleeve 116. A layer of insulating tape 152, shown in the figures and with exaggerated thickness, is preferably applied prior to winding the coil to provide insulation for the coil 150. This coil 1
50 is tightly wrapped around the annular space defined by the radial shoulders of the hub and base and the mating outer cylindrical surface of the sleeve. For this reason, the sleeve 116 is connected to the fitted cylindrical portion 11
5a and 114a. Thus, on the one hand, the sleeve 116
A connection with excellent thermal conductivity and mechanical strength is formed between the mated base and the magnetic pole on the one hand.

A non-magnetic button 135 is inserted with its head 136 inserted into the cavity of the armature;
It is placed so as to come into contact with the armature 120 in the retracted position. This button 135 is amateur 12
0 does not come into direct contact with the base 114.

This solenoid operates as follows. When the coil 150 is not energized, that is, no current is flowing through the coil, the armature 120 is biased to the right in FIG. are in contact. Next, coil 1
When current flows through the armature 50 and the armature 50 is energized, the armature 120 is attracted to the left against the aforementioned biasing force due to the generated magnetic flux, and comes into contact with the end cap 125 . At this time, the end cap 1 of the armature 120
A buffer washer 12 is attached to the surface that comes into contact with the shock absorber 25, which absorbs the impact energy at the time of a collision and makes the operation of the solenoid quieter. When the coil current is cut off, amateur 1
20 is again returned to the position shown in FIG. 1 by the aforementioned biasing force. The return path of the magnetic flux when the coil is excited is the shoulder 115 of the magnetic pole 115.
b, case 110, shoulder portion 114c of base 114;
formed by

The shaft 122 could also extend completely through the armature 120, or a suitable connection could be provided through an opening in the axial end 114b of the base 114 to produce a feedback signal corresponding to the position of the armature. You can also do it.
An example of such a feedback signaling device is U.S. Pat. No. 3,870,391 to Myers, issued March 11, 1975, assigned to the same assignee as the present invention.
No.

As described above, according to the present invention, each shoulder of the magnetic pole and the base is structured so as to come into contact with both end surfaces of the sleeve, so that the magnetic gap formed between the magnetic pole and the base can be easily adjusted to a predetermined size. It can be set exactly to the actual value.

In addition, since the coil is tightly wound on the outer circumferential surface of the sleeve, the sleeve is subjected to strong compression.
The sleeve, magnetic pole, and base have an integrated bobbin structure with high mechanical strength at their joints, and other joining means such as screwing or welding are not required. Furthermore, since the sleeve, magnetic pole, and base are in close contact over a considerable length, they have excellent thermal conductivity, and the heat generated in the coil is efficiently dissipated, allowing the solenoid to be used for a long time.

The sleeve of the present invention can be made of a low-cost tube material such as aluminum or brass, and can provide an easy-to-manufacture and inexpensive solenoid.

Furthermore, by extending the shoulders of the magnetic poles and the base outward from the outer diameter of the sleeve, the side walls of the coil storage cavity can be formed, making it easier to wind the coil.

[Brief explanation of the drawing]

1 is a longitudinal cross-sectional view of a dry solenoid according to the present invention, and FIG. 2 is a cross-sectional view taken along line 2--2 of FIG. 110... Case, 112... Coil (spool) assembly, 114... Base, 116... Sleeve, 120... Armature, 122... Shaft, 125... End cap, 128, 129...
...Sleeve bearing, 135...Button, 1
36...head, 150...coil.

Claims (1)

[Scope of Claims] 1. A case, an armature housed in the case, and a shaft for moving the armature in the axial direction via a shaft fitted into an opening provided at one end of the case and connected to the armature. a base having a shank and a shoulder; a magnetic pole having a shank and a shoulder; and a hollow non-magnetic coupling sleeve having an interior cavity and an outer surface for receiving the coil. The base and the magnetic pole are arranged such that each shaft part is housed in the cavity of the sleeve with each shoulder part in contact with both ends of the sleeve, thereby creating a magnetic field with a certain distance between the end faces of each shaft part. an electrical coil forming an air gap and further tightly wrapping a winding over the sleeve to compress the sleeve into a rigid mechanically bonding and thermally conductive engagement with the base and pole shafts; An axial type dry solenoid featuring: 2. The dry solenoid according to claim 1, wherein the sleeve is formed by cutting a non-magnetic tube material. 3. Each shoulder of the pole and base extends radially outwardly of the sleeve and defines first and second sidewalls, respectively, of the coil receiving cavity. The dry solenoid described in item 1.