JPS6346251Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vehicle equipped with a substarter switch in the engine room, and is intended to provide a structure that prevents the vehicle from running out of control due to starter operation during engine inspection.

<Background of the invention> For example, in a so-called cab-over type vehicle in which the driver's cab is placed above the engine room, when inspecting the engine, the driver's cab is tilted forward to look into the engine room. These cab-over vehicles are equipped with a substarter switch in the engine compartment to facilitate engine inspection, and the engine can be started using the substarter switch in the engine compartment without operating the main starter switch in the driver's cab. It has a structure.

If the transmission gear is set to a position other than neutral when operating the substarter switch, the vehicle will run out of control due to the rotational force of the starter, which is extremely dangerous.

<Prior Art> For this reason, a starter circuit as shown in FIG. 1 has been conventionally used. In other words, a neutral switch 2 is connected in series to the substarter switch 1, and the starter relay 3 can be energized by the substarter switch 1 only when the neutral switch 2 is on, that is, when the transmission gear is in the neutral position. so that voltage can be applied from the battery 5 to the starter 4 through the contact 3a of the starter switch 3.
It has a structure that allows it to be driven.

6 is the main starter switch installed in the driver's seat,
PH indicates preheating contact, ST indicates starter contact. Reference numeral 7 indicates a preheating device, which is a device for preheating the intake air of the diesel engine.

In other words, when a diesel engine is started, the intake air is generally preheated to improve startability, but at normal temperatures it is possible to start without special preheating, so the substarter switch 1 is sufficient to start the engine. However, there is an inconvenience that the engine cannot be started in cold weather unless it is preheated.

For this reason, when inspecting the engine in cold weather, the substarter switch 1 cannot be used, so the main starter switch 6 is used to start the engine.

<Disadvantages of the conventional method> When starting the engine using the main starter switch 6, the conventional circuit does not connect the neutral switch 2 to the main starter switch 6 in series, so the starter cannot be started even if the speed gear is in a position other than neutral. It is dangerous because the structure allows power to be supplied to 4.

Here, it is conceivable to connect the starter contact ST of the main starter switch 6 in series with the neutral switch 2, but with this configuration, if the engine stalls during driving, for example at a railroad crossing, the force of the starter 4 will be reduced. The method of using a starter that allows the train to run on its own and escape outside the railroad crossing is no longer adopted.
This is dangerous.

<Purpose of the invention> This invention aims to eliminate these inconveniences and provide a structure in which the main starter switch is automatically switched to be connected in series with the neutral switch only when inspecting the engine. It is.

<Example of the invention> Fig. 2 shows an example of the invention. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

This invention is characterized by a structure in which a changeover switch 8 is provided. This changeover switch 8
A so-called limit switch, which is turned on and off by an actuator, can be used.
For example, in the case of a cab-over type vehicle shown in FIG. 3, a changeover switch 8 constituted by a limit switch is installed on a chassis 9 near the engine room, and when the driver's cab 10 is in a drivable position, the actuator of the changeover switch 8 is installed. When the actuator is pressed and the driver's cab 10 is tilted forward, the pressing operation on the changeover switch 8 is released, and the changeover switch 8 is changed by operating this actuator.

One contact a of the changeover switch 8 is connected to the connection point between the substarter switch 1 and the neutral switch 2, and the other contact point b is connected to the connection point between the neutral switch 2 and the starter relay 3. The movable contact c is connected to the starter contact ST of the main starter switch 6.

The movable contact c contacts the contact b when the operator's cab 10 is in the operable position, and rolls into contact with the contact c when the operator's cab 10 is tilted forward.

<Operations and Effects of the Invention> According to the structure of the invention described above, the movable contact c of the changeover switch 8 is in contact with the contact b when the operator's cab 10 is locked in the operable position. Therefore, the main starter switch 6 is directly connected to the starter relay 3 without going through the neutral switch 2, and a normal starting operation can be performed in the operator's cab 10. In addition, if the engine stalls while driving and it is necessary to urgently drive a short distance, the main starter switch 6
By applying the power to the starter contact ST, the starter 4 can be driven regardless of the state of the neutral switch 2, and the driving force of the starter 4 can make the vehicle run on its own.

On the other hand, when the driver's cab 10 is tilted forward for maintenance inspection, the movable contact c of the changeover switch 8 is converted to the contact a. As a result, main starter switch 6 is connected to starter relay 3 through neutral switch 2. Therefore, when the main starter switch 6 must be used to preheat and start the engine in cold weather, the transmission gear must be in the neutral position, and if the transmission gear is in a position other than neutral, the starter 4 will It is not driven and safety is ensured.

As explained above, according to this invention, when the operator's cab 10 is tilted forward for maintenance inspection, the substarter switch 1 and the main starter switch 6 are switched to be connected in series with the neutral switch 2. Therefore, even if either the substarter switch 1 or the main starter switch 6 is operated, the transmission gear must be in the neutral position, so the vehicle will not run out of control due to the driving force of the starter 4, making it safe. .

<Other embodiments of the invention> Although the case of a cab-over type vehicle has been described above, this invention can be applied not only to this type of vehicle but also to other types of vehicles such as a rear engine bus or a bonnet type vehicle. can also be applied. In other words, when applying to other types of vehicles, the limit switch is installed in a position related to the engine compartment opening/closing mechanism, such as on the engine compartment cover or bonnet.
The configuration may be such that when the engine room opening/closing mechanism is opened, the limit switch is operated to switch, and the main starter switch 6 is connected in series to the neutral switch by this switching operation.

Further, although the above description has been made regarding a diesel engine vehicle, it is easy to understand that the present invention can also be applied to a gasoline engine vehicle.

[Brief explanation of drawings]

Figure 1 is a connection diagram for explaining the conventional example, Figure 2
The figure is a connection diagram showing one embodiment of this invention, and FIG. 3 is a side view for explaining the installation situation of the changeover switch, which is a feature of this invention. 1... Substarter switch, 2... Neutral switch, 3... Starter relay, 4... Starter, 6... Main starter switch.

Claims (1)

[Scope of utility model registration request] In a vehicle equipped with a substarter switch in which the substarter switch installed in the engine room is connected to the starting circuit via a neutral switch, a changeover switch that is operated in conjunction with the opening/closing mechanism of the engine room is provided. A vehicle equipped with a sub-starter switch configured to connect a main starter switch to the above-mentioned neutral switch in series connection when an engine room is opened by a changeover switch.