JPH0111547Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a differential case for an automobile, and in particular, to an improvement in heat dissipation technology for heat generated within the case.

(Prior Art) As a conventional differential case, the one described in, for example, Japanese Utility Model Application Laid-Open No. 59-122461 is known.

This conventional differential case was provided with heat dissipation fins on the rear surface of the case body.

Therefore, when heat is generated inside the case body due to continuous high-speed operation of an automobile, the heat is radiated from the heat dissipation fins, thereby cooling the case body.

(Problem that the invention aims to solve) However, in such conventional differential cases, the heat dissipation fins are provided on the rear surface of the case body, and the cooling performance is affected due to poor airflow. There was a problem that it was bad.

In particular, as shown in FIG. 6, a fuel tank 03 is provided at the rear of the case body 01, and a protector 04 for protecting the fuel tank 03 is provided between the fuel tank 03 and the case body 01. In the case where the heat dissipation fins 02 were exposed to air, the airflow was even worse.

Incidentally, non-slip differentials that have a clutch plate inside the case body are more likely to generate heat, so a differential case with good cooling efficiency has been desired.

Furthermore, as described in Japanese Utility Model Application Publication No. 56-10540, etc., there is also known a case in which a wind guide plate is provided at the rear position of the lower half of the rear surface of the case body. The lower end of this baffle plate is formed with a large protrusion downward from the outer periphery of the case body, and the protruding part introduces air, which cools the case body and warms it up. It had a structure that allowed air to exit through the gap between the upper end of the baffle plate and the rear surface of the case body.

However, this baffle plate was
When simply applied to the differential case of Publication No. 122461, the following problems would occur.

That is, since the air guide plate was provided at the rear of the lower half of the rear surface of the case body, air flow was poor in the upper half of the case body, resulting in extremely poor cooling efficiency.

Furthermore, the baffle plate itself merely guides air to the heat radiation fins and does not perform any further cooling action.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned conventional problems and provide a differential case with excellent cooling performance.

In order to achieve this object, in the differential case of the present invention, in a differential case in which a heat dissipation fin for cooling is provided on the rear surface of the case body, the heat dissipation fin is provided at a rear position of the case body. A baffle plate is provided in contact with the heat dissipating fin, and the baffle plate is inclined so as to surround the heat dissipating fin in order to guide the cooling air to the heat dissipating fin, and is large enough that its entire periphery extends outward from the outer periphery of the case body. A sloped portion of the air guide plate is formed, and an air vent hole penetrating back and forth is formed in a portion of the air guide plate located behind the heat dissipation fin.

(Function) Therefore, in the differential case of the present invention, the wind flowing near the case body from the front to the rear of the vehicle body is directed from the entire circumference of the baffle plate that extends outward from the outer circumference of the case body to the heat dissipation fin. It is guided to the side and flows out through the air vent hole in the baffle plate.

This air flow promotes heat dissipation from the heat dissipation fins and provides high cooling performance.

At the same time, the heat of the heat dissipation fins is transmitted to the air guide plate from the contact portion with the air guide plate, and is also radiated to the outside from the air guide plate.

(Example) Hereinafter, an example of the present invention is shown in FIGS. 1 to 5 and will be described in detail.

First, the configuration will be explained.

The differential case of the embodiment of this invention is
It includes a case body 10, heat radiation fins 20, and a baffle plate 30.

The case body 10 houses a differential case (not shown) interposed between a propeller shaft (not shown) and rear axles 40, 40. It contains differential oil, a lubricating oil that reduces the frictional resistance of the serial gear.

The heat dissipation fin 20 radiates heat generated within the case body 10. The heat dissipation fin 20 is provided integrally with the case body 10 on the rear surface of the case body 10, and includes vertical fins 22 and horizontal fins 24. , 24.

The vertical fins 22 are provided at the center of the rear surface of the case body, and the horizontal fins 24 are
It is integrally provided at an outer position of the vertical fin 22.

It should be noted that the vertical fins 22 at both left and right ends and the horizontal fins 24 at both upper and lower ends are formed taller than the others.

In addition, at the four corners of the rear surface of the case body 10,
A mounting post 50 with a mounting hole 52 formed at its tip is erected.

The air guide plate 30 is arranged behind the heat radiation fin 20 and guides wind to the heat radiation fin 20.
The baffle plate 30 is made of aluminum having high thermal conductivity, and is attached to the mounting post 50 with bolts 60 in close contact with the tall heat dissipating fins 20.

The baffle plate 30 has a dish-like shape and includes a bottom portion 32 that is in close contact with the heat dissipation fins 20, and an inclined portion 34 that is inclined toward the case body 10 so as to surround the heat dissipation fins 20 at the peripheral edge of the bottom portion 32. The entire circumference of the inclined portion 34 directs the wind W from the front to the bottom portion 32.
As shown in FIGS. 2, 3, and 4, the case body 10 is formed to slightly protrude from the outer periphery of the case body 10.

Note that, as shown in FIG. 2, the amount of protrusion of the inclined portion 34 is large in the horizontal direction and small in the vertical direction. This is done so that the minimum ground clearance of the vehicle will hardly change due to the downward overhang, and the amount of overhang is suppressed to avoid interference with the vehicle body due to the upward overhang. This is because there is.

Further, in the bottom portion 32, a heat dissipation fin 20
At the rear position of the
In order to guide the air to zero, air vent holes 36 are provided to sequentially exhaust the air guided to the heat dissipating fins 20 to the rear.

The air vent holes 36 in the left and right rows are for guiding wind to the left and right horizontal fins 24, 24, respectively, and those in the middle row are for guiding wind to the vertical fins 22.

Next, the operation of the embodiment will be explained.

The temperature inside the differential case increases almost in proportion to the vehicle speed, and as the vehicle continues to drive at high speed, the temperature inside the differential case is transmitted to the case body 10 and the heat radiation fins 20 via differential oil and the like.

By the way, as shown in FIGS. 3 and 4, the wind W flowing from left to right and above and below the case body 10 as the automobile travels is directed to the inclined portion 34 of the air guide plate 30 that protrudes from the outer periphery of the case body 10. It is guided to the heat dissipation fin 20. That is, since the entire circumference of the inclined portion 34 extends from the outer circumference of the case body 10 and is inclined so as to surround the heat dissipation fins 20, the wind W flows from the entire circumference of the inclined portion 34 to the heat dissipation fins 20.
be guided towards.

In addition, the wind W guided to the heat dissipation fins 20 is directed toward the rear of the bottom part 32 where the pressure is relatively negative through the air vent hole 36.
It flows more. Since the air vent hole 36 is provided in this way, the flow of this wind W becomes very smooth.

Therefore, due to the flow of this wind W, the heat dissipation fin 2
0 is efficiently cooled, and since this air volume increases as the traveling speed increases, as the speed increases and the amount of heat generated within the differential case increases, the cooling capacity also increases.

In addition, since the air guide plate 30 is made of aluminum with good thermal conductivity and is brought into close contact with the tall heat dissipation fins 20, the heat transferred to the heat dissipation fins 20 is also transferred to the air guide plate 30. The heat is also radiated from the baffle plate 30, resulting in even better cooling efficiency.

In addition, the amount of protrusion of the wind guide plate 30 from the outer periphery of the case body 10 is limited at the top and bottom, so the minimum ground clearance for the bottom does not change, and there is enough space for the top to avoid interference with the vehicle body. It is possible to prevent interference with the ground and the vehicle body.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, the thickness, shape, and number of heat dissipation fins may be freely designed.

Further, as shown in FIG. 5 showing another embodiment, a heat pipe 80 or the like may be used in combination.

(Effects of the invention) As mentioned above, the differential case of the present invention can further improve the cooling efficiency of the differential case with the simple configuration of adding a baffle plate without the need for any special equipment. The effect is that it can be improved.

In addition, the air guide plate has an inclined part extending outward from the outer periphery of the case body around the entire circumference, and air vent holes are formed in the area located behind the heat dissipation fins, so that the cooling air can be guided. The air is guided from the entire circumference of the board to the heat dissipation fins, allowing for better air flow and higher cooling efficiency than before.

In addition, since the air guide plate is brought into contact with the heat radiation fins, the heat of the heat radiation fins is conducted to the air guide plate and radiated, resulting in an effect that the cooling efficiency is further improved. That is, the baffle plate not only guides air to the heat radiation fins, but also acts as a heat radiation fin that further transfers and radiates the heat of the radiation fins.

Furthermore, in automobiles in which a fuel tank is provided immediately after the differential case, since the baffle plate covers the entire rear surface of the differential, it can also be used as a protector.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the differential case of the embodiment of the present invention, Fig. 2 is a rear view showing the embodiment device, and Fig. 3 is a plan view with the air guide plate cut away showing the embodiment device. FIG. 4 is a cutaway side view of the air guide plate showing the embodiment device, FIG. 5 is a side view of the embodiment device with the air guide plate cut away, and FIG. 6 is a side view of a conventional example. 10...Case body, 20...Radiation fin, 3
0...Air guide plate, 34...Slope portion, 36...Air vent hole.

Claims (1)

[Scope of Claim for Utility Model Registration] In a differential case in which heat dissipation fins for cooling are provided on the rear surface of the case body, an air guide plate is provided at a rear position of the case body in contact with the heat dissipation fins. , the air guide plate is formed with an inclined part that is inclined so as to surround the heat radiation fins in order to guide cooling air to the heat radiation fins, and whose entire circumference protrudes outward from the outer periphery of the case body; A differential case characterized in that an air vent hole is formed in a portion of the air guide plate located behind the heat dissipation fin, passing through the front and back.