JPH0241930A - Agricultural tractor engine cooling structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an engine cooling structure for an agricultural tractor.
Specifically, an engine is mounted in front of the driving section, an intake port is provided at the rear of the engine room that surrounds the engine, and an exhaust port is provided at the front.
The present invention relates to an engine cooling structure for an agricultural tractor configured to exhaust air from an exhaust port through the engine room.

[Conventional technology]

In such an engine cooling structure, since the intake port is located near the operating section, harsh noises such as vibration noise in the engine room and intake noise that leak from the intake port are likely to be transmitted to workers in the operating section.

Therefore, a lid that can be opened and closed is installed on the intake port, and when the engine speed is low and there is no risk of seizure, such as when idling, the opening of the intake port is made small to prevent noise from leaking outside. (It is preferable to leave it as a reference without listing references).

[Problem to be solved by the invention]

However, in conventional systems, the opening degree of the intake port is manually adjusted by the operator, so the degree of engine heating must be constantly monitored and the opening degree adjusted accordingly. Therefore, it is not only inaccurate but also troublesome, and the opening degree of the intake port is often left wide.

The present invention aims to improve cooling and soundproofing effects by accurately adjusting the opening of the intake port, and to eliminate the troublesomeness of adjusting the opening.

[Means to solve the problem]

A feature of the present invention for achieving the above object is that the present invention includes a temperature sensor that detects the degree of heating of the engine, and an opening adjustment mechanism that adjusts the opening of the intake port based on the detection result of the temperature sensor. The structure is such that the more heat is generated, the larger the opening of the intake port becomes.

[For production]

A temperature sensor detects the degree of heat generated by the engine. If the detection result is low, the opening adjustment mechanism automatically reduces the opening of the intake port to suppress the noise inside the engine room from leaking to the outside. In addition, if the detection result is high, the opening adjustment mechanism automatically increases the opening of the intake port.
Increase the amount of outside air you breathe in.

〔Effect of the invention〕

The present invention makes it possible to accurately adjust the opening degree of the intake port, thereby minimizing noise leakage when the engine heat generation is low while providing necessary and sufficient engine cooling. Ta. Furthermore, since the opening degree can be automatically adjusted according to the degree of heat generation of the engine, the operator no longer has to monitor or manually adjust the degree of heat generation of the engine.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

What is shown in FIG. 1 is the engine section of an agricultural tractor to which the present invention is applied. An openable and closable engine bonnet (1) is provided in front of the driving section (A) for driving this agricultural tractor, and an engine room (R) covered by a second engine bonnet (1) has an engine (2 )
It is equipped with. An intake fan (3) and a radiator (4) are provided behind the engine (2). In addition, there is a small intake port (5A) on the side surface of the aircraft side located behind the herring bonnet (1), a large intake port (5B) on the top surface, and a front end surface of the engine bonnet (1). are each provided with an exhaust port (6), and an intake port (
The space inside 5A) and 5B is used as an outside air introduction chamber (7). After the intake fan (3) takes outside air into the outside air introduction chamber (7) through the intake ports (5A) and (5B), the radiator (4) in the engine room (R)
and around the engine (2), and send it forward through the exhaust port (
6) has a cooling structure that exhausts the air to the front outside the vehicle.

The air intake port (5B) provided on the upper surface of the fuselage side is provided with a lid (8) that can be opened and closed by swinging. The lid (8) is equipped with an opening adjustment mechanism (9), and by operating this opening adjustment mechanism (9), the opening of the intake port (5B) can be adjusted and the amount of outside air taken in can be changed. It looks like this. The opening adjustment mechanism (9) includes a hydraulic cylinder (C) on the rear wall of the outside air introduction chamber (7).
y), and its piston rod (10) is attached to the lid (8).
When the hydraulic cylinder (Cy) is extended, the lid (8) swings upward to increase the opening degree, and conversely, when the hydraulic cylinder (Cy) is contracted, the lid (8) swings downward and the opening becomes smaller. The opening degree of the intake port (5B) is detected by an opening degree sensor (18), and is sent to a control device (17) to be described later.

Between the engine (2) and the radiator (4), there are two pipes (12), upper and lower, for circulating cooling water.
(13) is arranged. A temperature sensor (14) is provided on the upper pipe (12).
4), it is possible to measure the temperature of the cooling water and detect the degree of heat generation of the engine (2).

Hydraulic hose (Cy) led out from the hydraulic cylinder (Cy)
15) is a solenoid valve (
V). This electromagnetic valve (V), together with the temperature sensor (14), is electrically connected to a control device (17) adjacent to the electromagnetic valve (V).

The control device (17) automatically adjusts the opening of the intake port (5B) based on the detection result of the temperature sensor (14,). In other words, when a low temperature is detected, the solenoid valve (
v) to contract the hydraulic cylinder (Cy) and reduce the opening degree of the intake port (5B).

In addition, if a high temperature is detected, the solenoid valve (V)
is actuated to extend the hydraulic cylinder (Cy) and control to increase the opening degree of the intake port (5B).

In short, if the heat generation of the engine (2) is small and there is plenty of cooling capacity, the amount of outside air taken in will be small, so the opening of the intake port (5B) will be small, and the amount of air in the engine room (R,) will be reduced. Prevent noise from leaking outside as much as possible. Also, if the engine (2) generates a lot of heat and there is not enough cooling capacity, it is necessary to increase the amount of outside air taken in. This means that the noise is allowed to leak outside.

In carrying out the present invention, the temperature sensor (14) may be provided anywhere as long as it can detect the degree of heat generation of the engine (2). For example, it may be provided in the engine (2) itself or the radiator (4).

The opening adjustment mechanism (9) may be configured such that the lid (8) is driven by a servo motor.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings by the reference numerals.

[Brief explanation of the drawing]

The drawings show an embodiment of the engine cooling structure for an agricultural tractor according to the present invention, and FIG. 1 is a side view of the engine section, and FIG. 2 is a diagram showing an outline of the control. (2)...Engine, (5B)...Intake port, (6)...Exhaust port, (9)...
Opening adjustment mechanism, (14)...Temperature sensor (
A)...Driver section, (R)...Engine room.

Claims (1)

[Claims] An engine (2) is mounted in front of the driving part (A), an intake port (5B) is provided at the rear of the engine room (R) surrounding the engine (2), and an exhaust port (6) is provided at the front.
An engine cooling structure for an agricultural tractor configured such that outside air taken in from an intake port (5B) is passed through an engine room (R) and exhausted from an exhaust port (6), wherein the heat generation level of the engine (2) is controlled. a temperature sensor (14) that detects the
9), and the intake port (
5B) An engine cooling structure for an agricultural tractor configured to increase the opening degree.