JPH0246890B2 - KUMITATEENJINCHOSEIYOREIKYAKUSUISEIGYOSOCHI - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a system for supplying and discharging cooling water to the engine when adjusting the assembled engine during ignition operation on an engine assembly line. This invention relates to a cooling water control device.

[Prior art]

In a conventional engine assembly line, when the engine assembly is completed, the engine is taken out of the assembly line and placed on a circulating trolley, and the engine is subjected to, for example, idling adjustment, ignition timing adjustment, etc. In this case, of course, the adjustment is made by ignition operation with cooling water supplied to the engine, but in order to make adjustments according to the actual usage conditions of the engine, it is necessary to perform the adjustment after warm-up is completed, that is, when the cooling water is supplied. It is necessary to make the above adjustment after the temperature rises to a predetermined temperature. However, after supplying cooling water to the engine,
It takes a considerable amount of time to complete the warm-up operation, and therefore, conventionally, this engine adjustment has had the problem of long waiting time and low work efficiency.

Therefore, as a cooling water control device for adjusting the assembled engine, which can shorten the above waiting time, conventionally,
There was one described in JP-A-58-219433. In an engine equipped with a thermostat valve on the drain side, a water return passage and a water supply passage are provided to communicate the water storage tank with the drain port and the water supply port, respectively, and an auxiliary tank is interposed in the return water passage. A directional switching valve was provided that had a position communicating the upper and downstream sides of both passages, and a position communicating the auxiliary tank side of the water return passage and the engine side of the water supply passage. This conventional device has the effect of significantly shortening standby time by storing high-temperature cooling water in an auxiliary tank and supplying the cooling water to a new engine.

However, this conventional device requires a switching valve, a sensor, a control unit, etc. to control switching, and has the disadvantage of a complicated structure.Also, in the cooling water circulation state, cold water is supplied from the water tank. As a result, there was a problem in that the temperature change of the cooling water in the engine increased and it was difficult to obtain predetermined adjustment conditions.

By the way, some engines are equipped with a thermostatic valve on the water inlet side, and when controlling the supply and drainage of cooling water using the above-mentioned conventional device in such an engine, the cold water in the water tank is directly connected to the engine in the same way as described above. A problem arises in that the predetermined adjustment conditions cannot be obtained. In order to solve this problem, as stated in the above publication, it is sufficient to maintain the cooling water in the water storage tank at a predetermined temperature, but this requires a large amount of work. It requires a lot of heat and is not economical.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems.It is possible to quickly complete warm-up operation by supplying hot water to the engine to be adjusted, and it is also possible to constantly supply hot water even during cooling water circulation. It is an object of the present invention to provide a cooling water control device for adjusting an assembled engine that can perform engine adjustment.

[Structure of the invention]

The present invention provides a cooling water control device for adjusting an engine having a thermostat valve on the water inlet side after assembly, in which a water supply passage that communicates a water tank disposed at a higher position than the engine with the water inlet of the engine is provided. An auxiliary tank is installed at a height lower than the water tank and higher than the engine, one end of the return water passage is connected to the drain, the other end is branched into two passages, and one of them is fitted with a check valve. The other side is opened at the bottom of the auxiliary tank through the auxiliary tank, and the other side is opened above the water surface of the auxiliary tank, and the water supply passage from the water storage tank to the auxiliary tank is opened when the water level in the auxiliary tank falls below a predetermined level, and when the water level in the auxiliary tank reaches a predetermined level or higher. A closing valve device is provided, and open/close valves capable of intervening the flow of cooling water are interposed on the water supply passage side and the connection end side of the water return passageway to the engine supply and drainage ports.

As a result, in the present invention, the hot water in the auxiliary tank is first supplied to the engine to be adjusted from the drain port, and warm-up operation is completed in a short time, and when the cooling water in the engine reaches a predetermined temperature, the thermostat valve is activated. When the tank is opened, hot water in the auxiliary tank is supplied from the water supply port, and the supplied amount of water is returned to the auxiliary tank from the drain port.In this way, the cooling water is circulated without being supplied with cold water.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 and 2 show an embodiment of the present invention, and in the figures, reference numeral 1 denotes a truck for transporting an engine 2 to be adjusted, which has been assembled and is to undergo various adjustments, to an adjustment station. The adjustment station is provided with a device 3 of this embodiment for controlling the supply and drainage of cooling water to the engine 2.

A water tank 4 of the device of this embodiment is arranged above the truck 1, and an auxiliary tank 5 is arranged below the water tank 4 and above the engine 2. The auxiliary tank 5 and the water storage tank 4 are communicated with each other by a cold water supply pipe 6.
The upper and lower ends 6a and 6b open into the water storage tank 4 and the auxiliary tank 5, respectively, and a valve device 7 for maintaining the water level in the auxiliary tank 5 at a predetermined height is arranged at the lower end 6b. The device 7 consists of a shutter valve 7a and a float 7b for opening and closing the shutter valve 7a. Further, an upper end 8a of a hot water supply pipe 8 is connected to the bottom of the auxiliary tank 5, and a connecting flange portion 8b is provided at the lower end of the hot water supply pipe 8 for connecting it to the water supply port 2a of the engine 2. A manual on-off valve 10 is interposed near the connecting flange portion 8b, and a water supply path is formed in which the hot water supply pipe 8 and the cold water supply pipe 6 communicate the water tank 4 and the engine 2. 9 are configured.

Further, a thermostatic valve 2c is disposed at the water supply port 2a of the engine 2 to open it at high temperatures and close it at low temperatures. Also, the engine 2
A connecting flange portion 11a formed at the lower end of a water return pipe 11 serving as a water return passage is connected to the drain port 2b, and a manual on-off valve 13 is interposed near the connecting flange portion 11a. And the above return pipe 1
The upper end 11c of 1 is open to the upper part of the auxiliary tank 5, and is connected to the upper part of the water return pipe 11 and the auxiliary tank 5.
The initial water supply pipe 11b is connected in communication with the bottom of the water return pipe 11, that is, the upper part of the water return pipe 11 is branched into two passages. A check valve 12 is interposed in this initial water supply pipe 11b so as to face the direction in which the cooling water flows out from the auxiliary tank 5.

Next, the effects will be explained.

At the start of adjustment work for the engine 2 by the apparatus of this embodiment, the on-off valves 10 and 13 are closed, cooling water is supplied from the water storage tank 4 to the auxiliary tank 5, and the float 7b closes the shutter valve 7a. As a result, the cooling water in the auxiliary tank 5 is maintained at a predetermined water level.

When the first engine 2 to be adjusted is placed on the trolley 1 and transported to the adjustment station, an operator connects the hot water supply pipe 8 and the water return pipe 11 to the engine 2.
, and open the on-off valves 10 and 13. Then, as shown by the solid arrow in FIG. 1, the cooling water in the auxiliary tank 5 is supplied into the engine 2 from the drain port 2b through the check valve 12, and in this case, the thermostat valve 2c is closed. Therefore, when the water is not supplied from the water supply port 2a and the water level in the auxiliary tank 5 drops due to water being supplied into the engine 2, the shutter valve 7a opens and the amount of cooling water supplied from the water tank 4 is pumped into the auxiliary tank 5 by the amount of water supplied. is supplied to

Then, when the engine 2 is started and the temperature of the cooling water in the engine 2 rises to a predetermined temperature due to warm-up operation, the thermostat valve 2c opens, and as shown by the broken line arrow in FIG. The pump returns high-temperature cooling water from the drain port 2b through the return pipe 11 into the auxiliary tank 5, and at the same time, the returned cooling water in the auxiliary tank 5 flows through the hot water supply pipe 8 to the engine. In this case, since the amount of water supplied and the amount of returned water are the same, the water level in the auxiliary tank 5 does not change, so the shutter valve 7a remains closed, and the water storage tank in the auxiliary tank 5 is maintained. Cold water is not supplied from 4.

In this way, the cooling water in the auxiliary tank 5 circulates within the engine 2, and the temperature of the cooling water supplied to the engine 2, that is, the temperature of the cooling water in the auxiliary tank 5, reaches an appropriate temperature, and the temperature inside the engine 2 is increased. When the temperature change of the cooling water in the engine 2 becomes less large and the engine 2 becomes in a state suitable for actual usage conditions, various adjustments of the engine 2 are performed.

When the above engine adjustment is completed, the operator closes the on-off valves 10 and 13, and then closes the hot water supply pipe 8 and the return pipe 11.
from the engine 2. When this first engine 2 is carried out of the adjustment station by the trolley 1 and the second engine 2 is carried in, each of the pipes 8 and 11 is again connected to the engine to be adjusted.
The on-off valves 10 and 11 are opened. Then, as in the case of the first engine 2 above,
Cooling water is supplied from the discharge port 2b, and in this case, hot water is supplied from the auxiliary tank 5 to the engine 2, and the time required to warm up the second engine 2 is shortened accordingly. It happens.
In this case, the same amount of cold water as that supplied to the second engine 2 is supplied to the water storage tank 4.
It will be supplied into the auxiliary tank 5 from
Since the capacity of the auxiliary tank 5 is considerably larger than the cooling water capacity of the engine 2, the water temperature in the auxiliary tank 5 does not drop much, and as a result, the temperature change of the cooling water supplied to the engine 2 is smaller than the actual temperature change. It is about the same level as the usage situation.

In this way, in this embodiment, although the first engine 2 to be adjusted requires the same warm-up time as the conventional device, engine adjustment work can be started in a short time for the second and subsequent engines to be adjusted. The efficiency of adjustment work can be improved by shortening the standby time, and predetermined adjustment conditions can be easily obtained due to less temperature change of the cooling water, and adjustment accuracy can be improved.

〔Effect of the invention〕

As described above, according to the cooling water control device for adjusting an assembled engine according to the present invention, an auxiliary tank is interposed in the water supply passage that communicates the water tank and the water supply port, one end of the return water passage is used as the drain port, and the other end is used as the drain port. The end is branched into two, one of which is opened at the bottom of the auxiliary tank via a check valve, and the other is opened above the water surface of the auxiliary tank. A valve device that opens and closes at a predetermined water level is provided, and on-off valves that interrupt the flow of cooling water are installed on the water supply passage side and the water return passage side at the connection end to the engine supply and drain ports. Hot water can also be supplied to newly adjusted engines, which has the effect of ending warm-up operations early, and
Hot water can be constantly supplied even during cooling water circulation, temperature changes in the cooling water supplied to the engine can be reduced, and predetermined adjustment conditions can be easily obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a cooling water control device for adjusting an assembled engine according to an embodiment of the present invention, and FIG. 2 is an enlarged view of an auxiliary tank portion thereof. 2...Engine, 2a...Water supply port, 2b...Drain port, 2c...Thermostat valve, 3...Cooling water control device, 4...Water reservoir, 5...Auxiliary tank, 9
...Water supply passage, 11...Water return passage, 11b...One branch passage, 11c...Other branch passage, 12
……non-return valve.

Claims (1)

[Scope of Claims] 1. A device for controlling the supply and drainage of cooling water in order to adjust the engine in which a thermostat valve is provided on the water supply port side during ignition operation after assembly, the device being located at a higher position than the engine. An auxiliary tank for storing hot water in a water supply passage communicating between the water storage tank and the water supply port of the engine is installed at a height lower than the water storage tank and above the engine, and the auxiliary tank and the engine water are drained. A water return passage communicating with the auxiliary tank is provided, one end of which is connected to the drain port, the other end of which is branched into two passages, one of which is connected to the bottom of the auxiliary tank. The water supply passage from the water storage tank to the auxiliary tank has a water supply passage connected to the auxiliary tank through a check valve arranged in a direction that allows cooling water to flow out from the tank, and the other side is opened above the water surface of the auxiliary tank. A valve device is provided that opens when the water level in the auxiliary tank falls below a predetermined level and closes when the water level rises above a predetermined level, and furthermore, a cooling valve is provided on the water supply passage side and the water return passage side at the connection end to the engine supply and drain ports. A cooling water control device for adjusting an assembled engine, characterized in that an on-off valve capable of intermitting water flow is provided.