 Water detection device |
| I claim: 1. A device for detecting the presence of water in a fuel tank comprising: a water sensing ... |
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Electromagnetic actuator
| Details |
Inventors: Murai, Masakazu;
Assignee: Keihin Corporation (Tokyo, JP)
Primary Examiner: Dougherty; Thomas M.
Assistant Examiner: Jones; Judson H.
Attorney, Agent or Firm: Nikaido, Marmelstein, Murray & Oram LLP
An electromagnetic actuator includes a bobbin which is disposed between opposite ends of a housing made of a magnetic material and which has a coil wound therearound, a guide sleeve which is fitted to an inner periphery of the bobbin and which is opposed at one end thereof to one of wall ends of the housing and fitted at the other end thereof into a support bore in the other end of the housing, a stationary core fitted into the guide sleeve and caulked to the one end wall of the housing, and a movable core slidably fitted into the guide sleeve and cooperating with the stationary core. In this electromagnetic actuator, an end of the guide sleeve guiding the movable core is placed into close contact with and coupled in a caulked manner to an outer peripheral surface of the stationary core which is caulked and coupled to one of end walls of the magnetic housing. Thus, the coaxiality between the guide sleeve guiding the movable core and the stationary core can be assured despite a side thrust from the movable core. |
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DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide an electromagnetic actuator of the above-described type, wherein the coaxiality of the stationary and movable cores can be always assured by the guide sleeve to exhibit a stable performance.
To achieve the above object, according to a first aspect and feature of the present invention, there is provided an electromagnetic actuator comprising a bobbin which is disposed between opposite ends of a housing made of a magnetic material and which has a coil wound therearound, a guide sleeve which is fitted to an inner periphery of the bobbin and which is opposed at one end thereof to one of wall ends of the housing and fitted at the other end thereof into a support bore in the other end of the housing, a stationary core fitted into the guide sleeve and caulked to the one end wall of the housing, and a movable core slidably fitted into the guide sleeve and cooperating with the stationary core, wherein the guide sleeve is placed into close contact with an outer peripheral surface of the stationary core and fixedly coupled thereto.
With the first feature of the present invention, the coaxiality of the stationary core and the guide sleeve can be assured despite the side thrust applied to the guide sleeve from the movable core, thus, the coaxiality of both the cores is always kept by the guide sleeve, and the reciprocal movement of the movable core can be guided properly to provide a stable performance.
Moreover, it is not necessary to interpose a resilient ring between the stationary core and the guide sleeve as in the conventional electromagnetic actuator and hence, it is possible to reduce the number of parts and in its turn, to simplify the structure.
According to a second aspect and feature of the present invention, in addition to the first feature, the guide sleeve protrudes out of the other end of the housing.
With the second feature of the present invention, the support span of the guide sleeve for the movable core is increased and hence, the reciprocal movement of the movable core can be guided properly
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