JP2579183B2 - Engine cooling system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine cooling device in which a radiator is configured as a dynamic damper.

(Prior Art) Vibration of an engine is transmitted to the body of an automobile, and abnormal body vibration may occur at a resonance point. In particular, in the case of an automobile having an engine mounted on the front of the vehicle body, vertical vibrations are generated such that the front of the vehicle body sinks. for that reason,
For example, as described in Japanese Patent Application Laid-Open No. 57-60911, a radiator provided at a front portion of a vehicle body is used as a damper mass, and a vehicle body vibration is suppressed by an action of a dynamic damper configured thereby. Is conventionally performed. However, even if the radiator is configured as a dynamic damper, there is a problem that the expected damper function cannot be obtained.

Therefore, when the action of the dynamic damper constituted by the radiator was analyzed by a real machine,
It has been clarified that the following are the major factors that cannot provide a sufficient damper function. That is, although the radiator is fixed to the vehicle body, engine vibrations are also directly transmitted to the radiator via a hose that forms a cooling water passage, which hinders free vibration of the radiator. When the displacement in the vertical direction is particularly restricted by the engine vibration, the function of the radiator as a dynamic damper is significantly reduced. The hose connecting the radiator and the engine body is usually formed of an elastic body, but the transmission of engine vibration cannot be cut off. This is a major cause of the deterioration of the damper function.

(Object of the Invention) The present invention has been made in view of the above problems,
It is an object of the present invention to improve the function of a dynamic damper having a radiator as a damper mass.

(Structure of the Invention) The present invention is characterized in that the free vibration of the radiator is inhibited by the engine vibration transmitted through the hose constituting the cooling water passage as described above, and in particular, the displacement of the radiator in the vertical direction is restrained. It was found that the dynamic damper, which uses a radiator as the damper mass, was a major factor that was unable to fulfill its function sufficiently, and as a countermeasure, we found a means to block the transmission of engine vibration through this hose. Is as follows. That is, the present invention relates to an engine cooling device,
In an engine cooling device in which a radiator is configured as a dynamic damper for a vehicle body, a part of a cooling water passage between the radiator and the engine body is fixed to the vehicle body.

(Operation) The vibration of the engine is transmitted to the vehicle body frame via the mount portion, and attempts to generate vibration in the vertical direction such that the front part of the vehicle body sinks, especially the vehicle body. On the other hand, the radiator functions as a dynamic damper to suppress vehicle body vibration. At that time, the engine vibration tries to be transmitted directly to the radiator via the cooling water passage component,
Since the middle of the cooling water passage is fixed to the vehicle body, engine vibration is not directly transmitted to the radiator. Therefore, the radiator can vibrate freely without being constrained by engine vibration, and sufficiently exhibit a function as a dynamic damper.

(Example) FIG. 1 (plan view), FIG. 2 (side view), and FIG. 3 (front view) show an embodiment of the present invention.

In this embodiment, a radiator 1 is mounted in a position in front of an engine body 2 which is vertically arranged at a front part of a vehicle body, and a heat radiation surface 3 is inclined at a right angle to the crankshaft direction and slightly forward. . A collar 6 is inserted into each of the mounting holes 4 provided on the left and right of the upper part of the radiator 1 from the inside via a rubber member 5, and this is fixed to the vehicle body with bolts 7. Further, each one protruding portion 8 provided on the left and right sides of the lower surface of the radiator 1 is attached via a mount rubber 10 to a bracket 9 fixed to the vehicle body side. The radiator 1 is thus supported at four points via the elastic member,
This constitutes a dynamic damper against vehicle body vibration.

Cooling water inlet formed at one upper end of radiator 1
11 is the engine body 2 by the upper rubber hose 12
Water outlet 13 located in the upper center of the front
Is connected to the thermostat cover part 14. Also,
One of two divided rubber hoses 16 is connected to a cooling water outlet 15 formed at a lower position on the other end side of the radiator 1. And the other 17 of the lower rubber hose,
An interruption pipe 19 connected to a water pump inlet 18 on the upper part of the engine body 2 and connecting these lower rubber hoses 16 and 17 is fixed to a frame 21 on the vehicle body side by a hose mounting bracket 20. Water pump inlet 18
Is provided on an upper portion of a front end side surface of the engine body 2, and a mounting flange portion 18 a is provided at a forefront portion of the engine body 2, and a hose connection portion 18 b is located at a rearward position by a predetermined distance. Further, the relay pipe 19 is formed in a substantially L-shape, and is disposed such that its long side 19a is parallel to the crump axis direction and its short side extends downward on the radiator 1 side. The hose mounting bracket 20 is, as shown in FIG.
Support plate 20 having an arcuate part according to the shape of relay pipe 19
a, and a fixing plate 20b fixed to the vehicle body side frame 21 by the mounting bolts 22. Support plate 20a and fixed plate
20b is the connecting bolt 23 while the relay pipe 19 is sandwiched.
Are interconnected by

The engine body 2 vibrates in the rotational direction with the roll center near the crank center C. The water pump inlet 18, which is the cooling water inlet on the engine body 2 side, is at a height close to the roll axis and has a large vertical displacement due to the rotational vibration of the engine body 2, so that the radiator 1
When the vertical displacement of the radiator 1 is constrained by being transmitted to the cooling water outlet 15, the function of the radiator 1 as a dynamic damper is reduced. However, in this embodiment, the cooling water outlet 15 of the radiator 1 and the water pump inlet 18 are connected to the lower rubber hose 1 connected by the relay pipe 19.
Since the relay pipes 19 and 16 are connected to each other and the relay pipe 19 is fixed to the vehicle body, transmission of engine vibration via the lower rubber hoses 16 and 17 is almost completely shut off.

Further, a cooling water outlet 15 of the radiator 1 and a water pump inlet 18 are connected to a lower rubber hose 16, 1 divided into two parts.
Since the hoses 17 and 17 are connected as described above by the relay pipe 19, interference between the hoses 16 and 17 and the surroundings can be prevented, and the degree of freedom in the layout of the auxiliary equipment is large.

Since the water outlet 13, which is the cooling water outlet on the engine body 2 side, is located at a position higher than the roll axis and almost right above the roll axis, the vertical displacement due to the rotational vibration of the engine body 2 is small. Moreover, since the distance to the cooling water inlet 11 at one side end of the radiator 1 is large and connected by the long upper rubber hose 12, vibration is easily absorbed. Therefore, the reduction of the dynamic damper function due to the transmission of the engine vibration via the upper rubber hose 12 is small.

In this embodiment, the lower rubber hose constituting the cooling water passage on the outlet side of the radiator is connected with a relay pipe and fixed to the vehicle body side. However, the present invention is not limited to this.
Further, it is also possible to fix not only the radiator outlet side but also the middle of the inlet side cooling water passage to the vehicle body side.

The present invention can be implemented in various other modes.

(Effects of the Invention) The present invention is configured as described above, and transmission of engine vibration through the cooling water passage is blocked by the vehicle-body-side fixed portion, so that the degree of freedom of the radiator in the vertical direction is increased, The dynamic damper function is improved accordingly.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of one embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a front view thereof. 1: radiator, 2: engine body, 3: heat dissipation surface, 16, 17: lower rubber hose, 19: relay pipe, 20: hose mounting bracket.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-202937 (JP, A) JP-A-62-203820 (JP, A) Fully open 58-144022 (JP, U) Really open 127813 (JP, U) Full opening 1986-180818 (JP, U) Full opening 62-62323 (JP, U) Full opening 62-64631 (JP, U) Full opening 1987-130122 (JP, U) 62-182822 (JP, U)

Claims (1)

(57) [Claims] 1. An engine cooling device comprising a radiator as a dynamic damper for a vehicle body, wherein a part of a cooling water passage between the radiator and the engine body is fixed to the vehicle body.