Sheated-element glow plug having a particularly embedded contact element

a contact element and glow plug technology, applied in the direction of mechanical equipment, machines/engines, light and heating equipment, etc., can solve the problems of high manufacturing complexity and cos

Inactive Publication Date: 2007-04-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004] The present invention relates in particular to embodiments in which the contact is produced by an elastic conduction element such as a graphite tablet. Ceramic clamping sleeves are used in these embodiments for insulation and fixation. These sleeves surround the terminal pin and the graphite tablet and thus prevent contact with the housing. Simultaneously, they keep the contact element in a defined position, thus ensuring a good contact with the sheathed-element heater, i.e., the heating element.

Problems solved by technology

The clamping sleeves must therefore be made using a thin wall, which in the case of ceramic materials is associated with high manufacturing complexity and costs.

Method used

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  • Sheated-element glow plug having a particularly embedded contact element
  • Sheated-element glow plug having a particularly embedded contact element

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Embodiment Construction

[0015] The parts of a sheathed-element glow plug 1 on which the present invention is based are shown in FIG. 1. This sheathed-element glow plug 1 is made up of a plug housing 2 and a connection area 3 of a sheathed-element heater 4, which is not shown in greater detail.

[0016] A terminal pin 5 is provided within housing 2. In order to produce the electrical contact between terminal pin 5 and connection area 3 of the heater, a contact element 6 is provided between these two elements. This contact element is preferably elastic. A contact element 6 of this type may be, for example, a graphite tablet.

[0017] In order to secure contact element 6 and insulate the contact element and terminal pin 5 from housing 2, according to the present invention, a plastic sleeve 7 is inserted into housing 2, terminal pin 4 being situated within the plastic sleeve. This plastic sleeve 7 having a thin wall 8 may be produced simply and cost-effectively.

[0018] A recess 9 is provided in connection area 3 i...

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PUM

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Abstract

A sheathed-element glow plug for an internal combustion engine is described. It includes a plug housing, a connection part for the electrical current that is situated on the plug housing as well as a sheathed-element heater, which is usually in the form of a tube including an embedded heating element. The connecting part and the heating element are electrically coupled by a terminal pin and a contact element. The terminal pin and the contact element are at least partially surrounded within the housing by an electrically insulating plastic sleeve.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a sheathed-element glow plug for an internal combustion engine made up of a plug housing, a connection part for the electrical current which is situated on the plug housing as well as a sheathed-element heater, which is usually in the form of a tube including an embedded heating element. The connecting part and the heating element are electrically coupled by a terminal pin and a contact element. BACKGROUND INFORMATION [0002] The contact element together with the terminal pin and the connection area of the sheathed-element heater in the housing interior forms the positive contact. Various methods are known from the related art for securing the contact element within the housing of the sheathed-element glow plug and insulating it from the housing. [0003] Frequently sheathed-element glow plugs having a small diameter are requested. Since the electrical properties are predetermined by the sheathed-element heater and the term...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F23Q7/22F23Q7/00
CPCF23Q7/001F02P19/00F23Q7/00
Inventor HALUSCHKA, CHRISTOPHBACH, RAINERSOSSINKA, PETERKLONCZYNSKI, ALEXANDERJEANNEL, LAURENTGAISER, ANDREASBLANK, SUSANNE
Owner ROBERT BOSCH GMBH
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