JPH082467Y2 - Starting aid for 24-volt diesel engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a glow system for a diesel engine equipped with a 24-volt storage battery.

[Prior Art] A 12-volt ceramic glow plug has an electric heating wire diameter of about 0.2 mm. In case of 24 volt, the resistance value is about 4
Since it can be doubled, the diameter of the electric heating wire is about 0.1 mm.

[Problems to be solved by the invention] However, since such a ceramic glow plug for 24 volts has a thin electric heating wire, it has poor electrical durability.
Those that could be put to practical use have not been developed.

The purpose of the present invention is to use a ceramic glow plug 24
It is to provide a starting aid for a bolt-diesel engine.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configurations.

(1) A storage battery that generates an electromotive force of about 24 volts and a rod-shaped ceramic heating element in which an electric heating element is embedded in a ceramic sintered body are inserted into the distal end of a cylindrical mounting member in a protruding state, A four-cylinder diesel engine is equipped with a dual-insulation 12-volt glow plug, which is electrically connected to both ends of an exothermic body and electrically insulated from each of the current-carrying electrodes led out in an insulated state from the tubular mounting metal fitting. A glow plug group that is attached to the cylinder and electrically connects 12-volt glow plugs in series,
The movable contact is electrically connected to one end of the storage battery, the excitation side fixed contact is electrically connected to an electrical intermediate point of the glow plug group, and the first contact is electrically connected to the movable contact, and the movable contact is energized at one end side of the glow plug group. The excitation side fixed contact was electrically connected to the terminal, and the return side fixed contact was electrically connected to the return side fixed contact of the first electromagnetic relay, and the other end of the storage battery and the other end side energization terminal of the glow plug group, respectively. And a second electromagnetic relay.

(2) A storage battery that generates an electromotive force of about 24 volts and a rod-shaped ceramic heating element in which an electric heating element is embedded in a ceramic sintered body are inserted into the tip of a tubular mounting member in a protruding state, A two-insulation glow plug for 8 volt, which is electrically insulated from each of the current-carrying electrodes connected to both ends of the heating element and led out to the outside in an insulated state, is provided in each of the six-cylinder diesel engines. A glow plug group that is attached to a cylinder and has 8 volt glow plugs electrically connected in series,
The movable contact is electrically connected to one end of the storage battery, the excitation side fixed contact is electrically connected to an electrical intermediate point of the glow plug group, and the first contact is electrically connected to the movable contact, and the movable contact is energized at one end side of the glow plug group. The excitation side fixed contact was electrically connected to the terminal, and the return side fixed contact was electrically connected to the return side fixed contact of the first electromagnetic relay, and the other end of the storage battery and the other end side energization terminal of the glow plug group, respectively. And a second electromagnetic relay.

[Operation and Effect of Invention] (Operation of Claim 1) First, when the first electromagnetic relay is energized, a voltage of 12 V is applied to each 12-V glow plug, and the glow plug is rapidly heated.

First, when the energization of the electromagnetic relay is stopped and the second electromagnetic relay is energized, each 12-volt glow plug receives a voltage of only about 6 volts, so afterglow can be performed.

(Operation of Claim 2) First, when the first electromagnetic relay is energized, a voltage of 8 V is applied to each 8 V glow plug, and the glow plug is rapidly heated.

When the first electromagnetic relay is de-energized and the second electromagnetic relay is de-energized, each 8 volt glow plug receives a voltage of only about 4 volts, so afterglow can be performed.

(Effects of Claims 1 and 2) First and second electromagnetic relays, and insulation type 12 volt or 8
By using a ceramic glow plug for bolts, it is possible to assist starting of a 4-cylinder or 6-cylinder 24-volt diesel engine with excellent electrical durability.

[Embodiment] Next, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

A starting assist device A for a 24-volt diesel engine includes a 24-volt battery 1, a ceramic glow plug group 2, a rapid preheating relay 3 that is a first electromagnetic relay, and an after glow relay 4 that is a second electromagnetic relay. It is equipped with.

24-volt battery 1 is 12-volt battery 11, 12
Are connected in series and generate an electromotive force of about 24 volts.

The glow plug group 2 includes four 12-volt ceramic glow plugs 20 mounted on each cylinder (not shown) of a four-cylinder diesel engine, and these glow plugs 20 are electrically connected in series.

As shown in FIG. 2, the 12-volt ceramic glow plug 20 is made of a tungsten wire that is an electric heating element.
It has a rod-shaped ceramic heating element 23 in which a U-shaped coil 21 is embedded in silicon nitride 22.

The heating element 23 is inserted into the distal end portion 25 of the tubular mounting member 24 via the outer tube 26 in a protruding state.

In addition, the energizing electrodes 27 and 28 are connected to both ends of the coil 21 of the electric heating element and led out to the outside in an insulated state.
24 and electrical insulation is planned. This is a so-called two-wire ceramic glow plug.

In this embodiment, the 12-volt ceramic glow plug 20 means that the ceramic heating element 23 has a temperature characteristic in which the saturation temperature is 1000 ° C. ± 300 ° C. when 7 V is applied.

In the rapid preheating relay 3, the movable contact 31 is connected to the positive side terminal 13 of the 24-volt battery 1 and the excitation side fixed contact 32.
Are electrically connected to the electrical intermediate points m of the glow plug group 2.

In the afterglow relay 4, the movable contactor 41 is used as the hot side energizing terminal h of the glow plug group 2, and the exciting side fixed contactor 42 is used as the return side fixed contactor 33 of the rapid preheating relay 3.
Further, the return side fixed contactor 43 is electrically connected to the negative side terminal 14 of the 24-volt battery 1 and the cold side energizing terminal c of the glow plug group 2, respectively.

Next, the operation of the starting assist device A of the 24-volt diesel engine will be described.

First, the rapid preheating relay 3 is energized and a voltage of about 12 volts is applied to each 12-volt ceramic glow plug 20.

The glow plug 20 rapidly heats up, and the starter is rotated to start the engine.

The energization to the rapid preheating relay 3 is stopped and the afterglow relay 4 is energized.

Since a voltage reduced to about 6 V is applied to each glow plug 20, afterglow can be performed.

Next, the effect of the starting assist device A for the 24-volt diesel engine will be described.

(A) Using a 12-volt ceramic glow plug 20,
It can assist in starting a 4-cylinder 24-volt diesel engine.
The current-carrying durability is good because the 12-volt ceramic glow plug 20 is used.

(A) The circuit structure is simple and inexpensive.

(C) Because the 12-volt batteries 11 and 12 are not connected in parallel or in series, there is a risk of short circuit,
Problems such as power failure during connection switching and internal battery discharge due to parallel connection do not occur.

(D) Since the use of the excitation side and return side fixed contacts of the relays 3 and 4 is considered, even if the wiring to the electromagnetic coil of the relays 3 and 4 is broken, rapid preheating is not stopped. There is no problem such as rapid energization of only the two glow plugs on the right side of the figure.

 FIG. 3 shows a second embodiment of the present invention.

A start assist device B for a 24-volt diesel engine is equipped with an 8-volt glow plug 50 in each cylinder of a 6-cylinder diesel engine, and the 8-volt glow plugs are electrically connected in series.

When the diesel engine has 6 cylinders, the configuration is as in this embodiment, and the same effect as that of the first embodiment is obtained.

The ceramic glow plug of the present invention is not limited to the above embodiment, and a conductive ceramic may be used as an electric heating element instead of a coil made of a tungsten wire.

[Brief description of drawings]

FIG. 1 is a first embodiment of the present invention and is an electric circuit diagram of a starting assist device for a 24-volt diesel engine. FIG. 2 is a partial sectional view of a 12-volt ceramic glow plug used in the device. FIG. 3 is a second embodiment of the present invention and is an electric circuit diagram of a starting assist device for a 24-volt diesel engine. In the figure, 1 ... 24-volt battery (storage battery), 2 ... Ceramic glow plug group (glow plug group), 3 ... Rapid preheating relay (first electromagnetic relay), 4 ... After glow relay (second electromagnetic relay) , 13 ... Positive side terminal (one end of storage battery), 14 ... Negative side terminal (other end of storage battery), 20
… 12-volt ceramic glow plug (12-volt glow plug), 21… Coil (electric heating element), 22… Silicon nitride (ceramic sintered body), 23… Ceramic heating element, 24… Cylindrical mounting bracket, 25… Tip part, 27, 28 ... Current-carrying electrodes, 31, 41
… Movable contact, 32, 42… Exciting side fixed contact, 33, 43… Return side fixed contact, 50… 8 Volt ceramic glow plug (8 Volt glow plug), A, B… 24 Volt diesel engine Starting auxiliary device, c ... cold side energization terminal (other end side energization terminal), h ... hot side energization terminal (one end side energization terminal), m ... electrical intermediate point

Claims (2)

[Scope of utility model registration request] 1. A storage battery that generates an electromotive force of about 24 volts, and a rod-shaped ceramic heating element in which an electric heating element is embedded in a ceramic sintered body are inserted in a protruding state at the tip of a cylindrical mounting member, A four-cylinder diesel engine is equipped with a double-insulation 12-volt glow plug, which is electrically insulated from each of the energizing electrodes connected to both ends of the electric heating element and led out to the outside in an insulated state, and the tubular mounting bracket. Mounted on each cylinder, the glow plug group in which 12-volt glow plugs were electrically connected in series, the movable contact at one end of the storage battery, and the excitation side fixed contact at the electrical midpoint of the glow plug group. , A first electromagnetic relay electrically connected to each, and a movable contact to the one end side energization terminal of the glow plug group,
The excitation side fixed contact is electrically connected to the return side fixed contact of the first electromagnetic relay, and the return side fixed contact is electrically connected to the other end of the storage battery and the other end side energization terminal of the glow plug group. A 24 volt diesel engine starting aid with an electromagnetic relay. 2. A storage battery that generates an electromotive force of about 24 volts, and a rod-shaped ceramic heating element in which an electric heating element is embedded in a ceramic sintered body are inserted in a protruding manner at the tip of a cylindrical mounting member, A dual-cylinder 8-volt glow plug, which is electrically insulated from each of the energizing electrodes connected to both ends of the electric heating element and led out to the outside in an insulated state, and the tubular mounting metal, is a 6-cylinder diesel engine. Mounted on each cylinder, and a glow plug group in which glow plugs for 8 volts are electrically connected in series, a movable contactor at one end of the storage battery, and an excitation side fixed contactor at an electrical intermediate point of the glow plug group. , A first electromagnetic relay electrically connected to each, and a movable contact to the one end side energization terminal of the glow plug group,
The excitation side fixed contact is electrically connected to the return side fixed contact of the first electromagnetic relay, and the return side fixed contact is electrically connected to the other end of the storage battery and the other end side energization terminal of the glow plug group. A 24 volt diesel engine starting aid with an electromagnetic relay.