JPH1111360A - Vehicle under-floor parts cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle under-floor cooling device, which is simple with weight lightened and a cost reduced, having wide applicability without depending on a vehicle structure, preventing damage due to interference with the ground surface, providing high durability of a performance decrease factor suppression or the like at damaged time. SOLUTION: A cooling device for a vehicle under-floor parts has a front end surface 71 provided with R, horizontal surface 73 formed by a horizontal plate successively provided in line with the front end surface, and an upward guide surface 75 having a prescribed angle to be successively provided in the horizontal, surface, and a lower surface of the horizontal surface 73 serving as the lowest ground height, an upper surface of the horizontal surface is mounted in a cross member 60. Ram air in a vehicle under-floor is guided to the upward guide surface 75, and under-floor parts (differential 57 or the like) in a vehicle rear part is hit and cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfloor structure of a vehicle, and more particularly to a device which is disposed under the floor of a vehicle and which is desired to be cooled, such as a differential gear.

[0002]

2. Description of the Related Art FIGS. 14 and 15 show the flow of air under a floor of a vehicle. In vehicles with an engine at the front of the vehicle, heat generated from the radiator, engine, exhaust, etc. is carried to the rear half of the vehicle under the floor by the wind passing through the engine room and the wind flowing directly under the floor from the front of the vehicle. The flow of air is basically a high-temperature flow.
Normally, the underfloor shape of the vehicle C is a suspension, a frame,
Due to the presence of the parts 10 such as various structural members for reinforcing the vehicle body floor panel, a complicated uneven shape is formed. The airflow flowing from the front part to the rear part of the vehicle during traveling collides with the unevenness of the component 10 and is separated and disturbed by the flow A having a low flow velocity.
1 and a high-speed flow A2 flowing near the ground without passing through the uneven portion of the component 10. The air flow A1 under the floor where the separation has occurred in the portion where the component 10 protrudes is caused by the separation area 10 between the component 10 and the component 10.
In (a), the flow is stagnant and the heat is prevented from being carried by forced convection, so that heat easily accumulates, and the temperature rise below the floor in the rear half of the vehicle downstream of the traveling wind is further promoted. In order to prevent heat damage to under-floor components caused by such a high-temperature flow, cooling of components and prevention of heat from entering a vehicle interior are extremely important issues in design.

Conventionally, any one of the following methods has been mainly used to prevent heat damage and cooling of underfloor components. 1) Cover the high temperature source with insulation. Example: Cover an exhaust pipe or the like with a heat insulating material (heat protector). 2) A cooling fin is provided on a target component whose temperature is to be prevented, for example, a differential gear to improve heat dissipation. Japanese Utility Model Laid-Open No. 3-25066, Japanese Utility Model Publication No. 60-173
No. 82, Japanese Utility Model Laid-Open No. 63-58858, Japanese Utility Model 1
No. 11547, Japanese Utility Model Laid-Open No. 63-92864,
See JP-A-63-115957. 3) A method in which cooling air is introduced into a part requiring cooling by some means. For example, a duct is arranged, cooling air is introduced, and the cooling air is guided to a protection target site and cooled. 63-126664
Gazette, Japanese Utility Model Application Laid-Open No. 63-109067, Japanese Utility Model Application
See JP-A-94362 and JP-A-63-67332. 4) Add a cooling device separately. For example, a separate oil cooler for cooling differential gear oil is provided. JP-A-63-82861, JP-A-62-27
8371, JP-A-62-184236, JP-B-63-63406, JP-A-63-17687
See No. 2 publication. 5) It is based on a combined configuration of 1) to 4). 63-
See, for example, JP-A-115958 and JP-A-63-114725.

[0004]

The prior art of each of the above-mentioned items has the following problems. The method 1) is a very general method, but the heat source to be covered is limited to those originally made of a heat-resistant material such as an exhaust system. Although the temperature is relatively low as compared with the exhaust system like a differential gear, this method cannot be adopted when the heat generation itself is low and the heat resistance is low. That is, in the differential, the oil temperature rises as the rotational speed increases due to frictional heat of the gears and bearings and heat generated by the shearing motion of the lubricating oil. The heat resistance limit of lubricating oils, seals and packings is one hundred and several tens degrees. 2) cannot be adopted unless cooling air is always present or the ambient temperature is low. Therefore, in areas where there is a large number of separated areas and the air flow is stagnant, such as under the floor of a vehicle, there is no cooling air itself,
Further, since the ambient temperature is high, there is a case where there is no effect even if the heat radiation property of the target portion is improved.

[0005] In 3), it is considered that cooling air can be effectively taken in principle. However, when the configurations disclosed in the respective publications are implemented, the following problems can be estimated. JP-A-63-109067, JP-A-63-11266
No. 4: Publication "Guiding part" for air guide falls below the lower surface of the differential case, so that the minimum ground clearance cannot be secured or the minimum ground clearance changes, and the "Guiding part" interferes with the ground. There is a very real problem of damage. In addition, the use of a shape memory alloy inevitably increases the cost. 63-
JP-A-67332 and JP-A-63-94362:
Since it uses a floor tunnel, it cannot be applied to vehicles with frames such as trucks and RVs. Alternatively, when a floor tunnel is formed separately, the floor tunnel installation range extends from the rear end of the engine room to the differential, and thus the weight and cost are considerably increased. The configuration of 4) in which a cooling device is added inevitably causes an increase in cost and weight.

Therefore, in order to solve the above problem, the cooling air introduction mechanism of the present invention for cooling various parts under the vehicle floor has a wide applicability independent of the vehicle structure such as the presence or absence of a floor tunnel. Another object of the present invention is to provide a simple, lightweight, and inexpensive vehicle underfloor cooling device having high durability such as prevention of breakage due to ground interference and suppression of a performance reduction rate at the time of damage.

[0007]

According to the present invention, there is provided a cooling device for under-floor parts of a vehicle, comprising: a front end face with an R; a horizontal plane formed by a horizontal plate connected to the front end face; It has an upper guide surface connected continuously, the lower surface of the horizontal surface is set to the minimum ground clearance, the upper surface of the horizontal surface is mounted on the cross member, the running wind under the vehicle floor is guided to the upper guide surface, and it hits the underfloor parts at the rear of the vehicle. A cooling configuration is provided.

[0008] Further, a mounting tool for attaching to a vehicle underfloor disposition member is provided on a horizontal surface, a cutout portion is provided on an upper guide surface, and the cutout portion is disposed at an interference portion with the underfloor component, and is disposed. A connecting piece having a curved surface is interposed between the first guiding surface and the first guiding surface, or the upper guiding surface is divided into two in the traveling direction of the traveling wind to form a first guiding surface and a second guiding surface. There is also a configuration in which the arrangement angle of the second guide surface with respect to the horizontal plane is changed to change the cooling portion at the rear of the vehicle. Further, the vehicle under-floor component cooling device includes an upper guide surface directly connected to the edge of the front end surface with R at a predetermined angle,
The vehicle is equipped with a structure in which the vicinity of a continuous portion between the front end surface and the upper guide surface is mounted on the cross member with a minimum ground clearance, and a traveling wind under the vehicle floor is guided to the upper guide surface and hits an underfloor component at the rear of the vehicle.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial perspective view under a vehicle floor, and FIG. 2 is an explanatory view of a baffle plate. In the lower part of the floor of the vehicle, side members 50A and 50B disposed on both sides in the vehicle front-rear direction, and a fuel tank 51, a silencer 53, and a propeller shaft 5 disposed between the side members 50A and 50B.
5, differential 57, and the like. Side member 5
A plurality of cross members are arranged between 0A and 50B. The cross member 60 disposed at the rear of the vehicle includes a fuel tank 51, a silencer 53, a propeller shaft 5
In order not to interfere with the members 5 and the like, a convex portion 63 whose central portion is protruded in the running surface direction is formed. The convex portion 63 of the cross member 60 has a minimum ground clearance in a portion below the vehicle floor. The air guide plate 70 is mounted on the convex portion 63 of the cross member 60.

The air guide plate 70 is a wind guide plate formed of an iron plate, an aluminum plate, or a synthetic resin plate having rigidity corresponding to an iron plate or an aluminum plate. The air guide plate 70 has a front end surface 71 having a curvature, a flat central horizontal surface 73 connected to the front end surface 71, and a predetermined inclination angle α with respect to the central horizontal surface 73.
And a plate-shaped inclined guiding surface 75 which is provided continuously. Then, the front end surface 71 of the baffle plate 70 is positioned in the front direction of the vehicle, the central horizontal plane 73 is overlapped with the convex portion 63 of the cross member 60, and the inclined guide surface 75 is formed on the cross member 60 in the direction of the floor of the vehicle body. Attach. As described above, the wind guide plate 70 mounted on the cross member 60 is located within the range of the minimum ground clearance, and is located at a position where the fast running smooth wind existing below the vehicle floor surface and the central horizontal plane 73 are in contact with each other. .

Next, the operation of each part of the air guide plate 70 will be described. 1) Front end face 71 with R The wind flowing down from the front of the vehicle is received on the curvature plane, and the wind is guided to the central horizontal plane 73 without separating the flow. 2) Central horizontal plane 73 This is the reference plane when the air guide plate 70 is attached, and is the lowest ground plane. Then, the traveling wind below the floor of the vehicle is captured and guided to a continuous upper guiding surface 75. 3) Upper guide surface 75 The traveling wind flows upward by the guide surface which is disposed at an angle α with respect to the central horizontal plane 73. By considering the angle α between the central horizontal plane 73 and the central horizontal plane 73, the vicinity of the tolerance portion between the central horizontal plane 73 and the upper guide surface 75 is not broken by a broken line when viewed in the side view shown in FIG. Even so, the flow flows upward along the upper guide surface 75 without causing separation.

The flow of the traveling wind under the floor of the vehicle configured as described above will be described with reference to FIGS. When the lower part of the floor of the vehicle C is smooth, the air flow under the floor UC of the vehicle C flows quickly from the front part to the rear part of the vehicle C. 10 are protruding. For this reason, the air flow in the lower floor UC is divided into the first flow UC1 flowing through the uneven portion where the member 10 protrudes, and the member 10
Becomes the second flow UC2 flowing in a portion where there is no unevenness. The first flow UC1 collides with the protruding portion of the member 10 to cause separation, resulting in a stagnant flow having a low average flow velocity (indicated by an arrow a). However, the air guide plate 7 fixed to the cross member 60
The flow near zero is guided along the front end surface 71 having an R on the front surface of the baffle plate 70 and flows down along the baffle plate 70. The second flow UC2 flows on the side close to the ground and has a uniform flow (indicated by an arrow b) because there is no obstacle. And
The airflow flowing at the boundary between the second flow UC2 and the first flow UC1 is guided by the baffle plate 70 provided at the convex portion 63 of the cross member 60 provided at the minimum ground clearance and flows down. I do.

Here, since the air guide plate 70 has a central horizontal surface 73 parallel to the floor surface and an upper guide surface 75 inclined in the floor direction, the downstream wind guided by the air guide plate 70 flows. b flows down toward the rear under the floor of the vehicle at a high flow velocity as shown by an arrow b. Here, the inclination angle α of the upper guide surface 75 of the air guide plate 70 is, for example, a reference angle α =
When the angle is set to 20 ° and the angle variation is set to ± 5 °, the wind guided by the upper guide surface 75 and flows down hits the lower surface of the differential. For vehicles at 90 km / h,
The variation in the oil temperature of the differential due to the variation (± 5 °) of the mounting angle of the upper guide surface 75 was extremely small at 1 ° C. As described above, since the wind flows at a high speed toward the lower surface of the floor behind the position where the air guide plate 70 is provided, the flow velocity in the underfloor region G increases, and the members (for example, Differential) cooling effect is increased.

As described above, the cooling device for underfloor parts of a vehicle according to the present invention applies a traveling wind having a large flow velocity near the minimum ground height to a flow having a relatively low flow velocity near the floor below the vehicle floor. The air guide plate is attached to a member located at the position (1) to guide it upward, and is cooled by hitting an underfloor part or the like (including the vicinity of the vehicle floor). As described above, the cooling device of the present invention has a mechanism for guiding the traveling wind having a high flow velocity below the floor of the vehicle along the smooth horizontal surface 73 and capturing the traveling wind in the differential direction. This mechanism is different from the wind guide mechanism of the type in which the wind guide plate is placed and scooped up in the traveling wind, and unlike the wind guide mechanism by the duct, the air around the wind guide plate installation site is drawn in efficiently and a new Form an air flow.

Next, an embodiment of the air guide plate 70 will be described. 1) Width W Secure the width of the differential case as the minimum width.
The wider the width W, the greater the effect. For example, when the width W of the baffle plate 70 is 200 (mm) in the differential case width 200 (mm), the width W of the baffle plate 70 is
Was set to 300 (mm), the cooling effect was improved at 5.75 (° C.) at a vehicle speed of 90 (km / m). 2) Length L The length L ₂ of the central horizontal plane 73 is ensured to be 60 (mm) or more. The length L ₃ of the upper guide surface 75: 150 (mm) or more is secured. As the length L ₃ is long, the wind guide effect is high, interference between the underfloor components, for example, may be the length from the interference of the surface of the propeller shaft 55 is restricted. In this embodiment, the length L ₃ is set to 180 mm so as not to interfere with the propeller shaft 55. In region G, a sufficient cooling effect was obtained. 3) Selection of plate thickness and material Since the wind pressure is not so large and is not a structural strength member, it is made of an iron plate, aluminum, or a resin having a heat-resistant temperature of about 100 (° C.) of t = 1 to 2 (mm). 4) Arrangement angle α of upper guide surface Assuming that the angle α is 20 ° ± 5 ° with respect to the central horizontal plane 73, the traveling wind guided by the upper guide surface 75 passes through the differential 57 portion behind the vehicle.

Next, application examples of the air guide plate will be described. (1) The center horizontal plane of the air guide plate and the upper guide surface are continuous with a curved surface. ... See FIG. 5 This air guide plate 70A has a front end surface 71A with an R, a horizontal surface 73A continuous with the front end surface 71A, and an upper guide surface 75A, and a curved surface between the horizontal surface 73A and the upper guide surface 75A. The connecting piece 74A is continuously provided. The air guide plate 70A can guide the air further upward by setting the inclination angle α of the upper guide surface 75A to 20 ° or more.

(2) Warp the horizontal surface in the horizontal direction. …
... See FIG. 6 This air guide plate 70B has a front end surface 71B with an R, a continuous surface 73B continuous with the front end surface 71B, and an upper guide surface 75B. The center of the continuous surface 73B is R
Surface 730B. By forming the R surface 730B on the connection surface 73B, the water that accumulates at this portion falls along the curved surface. The air guide plate 70B prevents water from staying in the mounting portion, and improves the rust prevention performance of the cross member and the air guide plate. As a rust prevention mechanism of the baffle plate, water is prevented by holding resin between the cross member and the horizontal surface of the baffle plate, or water is collected by drilling holes in the horizontal surface. It is good also as composition which prevents that.

(3) A wind guide plate to be attached to a vehicle having no frame. … See FIGS. 7 and 8 This air guide plate 70C is a horizontal surface 73 that is continuous with the front end surface 71C.
Stays 76C are erected on both side edges of C. The air guide plate 70C is a wind guide plate having a width in consideration of the width of a floor tunnel or the like, and the stay 76C is attached to the floor tunnel by appropriate means, so that even a vehicle without a frame (cross member) can travel. The wind is guided to the upper guide surface 75C to cool the differential direction.

(4) A baffle plate without a central horizontal plane. …
... See FIG. 9 This air guide plate 70D has an upper guide surface 75D directly connected to a front end surface 71D with an R. Although the traveling air flows through the air guide plate 70D as indicated by the arrow c, the air guide effect is slightly reduced (several%) as compared with the air guide plate having a horizontal surface. this is,
Since there is no horizontal plane for running the traveling wind having a high flow velocity below the floor of the vehicle, a part of the traveling wind flowing down along the curvature of the front end face 71D is considered to flow down to the ground.

(5) A notch is provided in a part of the air guide plate.
... Refer to FIG. 10. This air guide plate 70E is guided upwards on the fuel tank side in consideration of safety aspects such as preventing interference with other parts and preventing the air guide plate 70E from hitting and damaging the fuel tank at the time of collision. Face 7
A cutout 77E is formed by cutting out a part of 5E.
The notch 77E formed in the upper guide surface 75E of the air guide plate 70E can avoid interference with the fuel tank even if there is vibration due to impact. Also, the upper guiding surface 7
5E guides the traveling wind in the differential direction in the remaining portion.

(6) Divide the air guide plate. …… Figure 11,
12 and 13 The upper guide surface is divided (FIGS. 11 and 12). The air guide plate 70F has a first upper guide surface 750F and a second upper guide surface 755F connected to a horizontal plane 73F connecting the front end surface 71F. The first upper guide surface 750F is arranged at an inclination angle alpha ₁ relative to the horizontal plane 73F. Second upper guiding surface 755
F is arranged at an inclination angle alpha ₂ relative to the horizontal plane 73F.
Here, if the angle α ₁ is larger than the angle α ₂ , the traveling wind guided by the first upper guide surface 750F and flowing down flows in the direction of arrow d to cool the front part of the differential, and the second upper guide surface 755F The traveling wind that is guided and flows down in the direction of arrow e cools the rear part of the differential.

The air guide plate is divided (FIG. 13). The baffle plate has a first baffle plate 70G and a second baffle plate 70H. The baffle plate is attached to the cross member 60 at intervals h so as to avoid interference with the fuel tank 53. Even if the air guide plate vibrates due to the vibration of the vehicle or the like, the distance h is set to avoid interference with the fuel tank 53.
The two air guide plates 70 </ b> G and 70 </ b> H provided with the above do not give an impact to the fuel tank 53. The traveling wind is guided by the first and second wind guide plates 70G and 70H and flows down in the differential direction to cool. As described above, the wind guide plate shown in each application example catches the traveling wind having a large flow velocity below the floor of the vehicle along a smooth surface and guides the wind in the differential direction.

[0023]

According to the above configuration, the cooling device for a vehicle underfloor member according to the present invention has the following effects. 1) Cooling effect Approx. The effect of cooling the differential oil at 26 ° C. was obtained, and the differential oil temperature target value was cleared. 2) There is no decrease in the minimum ground clearance Since the wind is guided along the horizontal surface of the thin air guide plate attached to the cross member installed at the minimum ground clearance, it is like a type that picks up and guides the wind There is no decrease in minimum ground clearance. 3) Damage to the cooling system is minimized. The minimum ground clearance of the vehicle is set so as not to interfere with the ground under normal use conditions. Devices that do not reduce the ground clearance minimize the risk of damage due to interference with the ground.

4) Variations (including variations in the angle of the upper guide surface ± 5 °) including the angle accuracy of the upper guide surface due to the manufacturing error of the air guide plate itself and the accuracy of assembling the wind guide plate to the vehicle.
Since the cooling effect does not change suddenly, the tolerance of dimensional control is wide,
High productivity. 5) Since the wind guiding effect is flexible, even if a slight deformation occurs due to interference with the ground, the cooling effect on the underfloor portion at the rear of the vehicle is hardly reduced. 6) The flat plate is simply bent so that it can be provided simply, lightly, and inexpensively. 7) It has wide applicability regardless of the vehicle structure such as the presence or absence of a floor tunnel and the presence or absence of a frame.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cooling device provided under a floor of a vehicle.

FIG. 2 is an explanatory view of a baffle plate.

FIG. 3 is an explanatory diagram of a traveling wind under a floor of a vehicle.

FIG. 4 is an enlarged view of a traveling wind below the floor of the vehicle.

FIG. 5 is a side view of another embodiment of the baffle plate.

FIG. 6 is a perspective view of another embodiment of the baffle plate.

FIG. 7 is a perspective view of another embodiment of the baffle plate.

FIG. 8 is an explanatory view showing a state in which a baffle plate is mounted on a vehicle.

FIG. 9 is a side view of another embodiment of the baffle plate.

FIG. 10 is an explanatory view of another embodiment of the baffle plate.

FIG. 11 is a perspective view of another embodiment of the baffle plate.

FIG. 12 is a perspective view in which a wind guide plate according to another embodiment is disposed under the floor of a vehicle.

FIG. 13 is a perspective view in which a wind guide plate according to another embodiment is disposed under a floor of a vehicle.

FIG. 14 is an explanatory diagram of a conventional example of a traveling wind under the floor in a vehicle.

FIG. 15 is an enlarged view of a conventional traveling wind below the floor of a vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Underfloor installation member 50 Side member 51 Silencer 53 Fuel tank 55 Propeller shaft 60 Cross member 63 Convex part 70 Air guide plate 71 Front end face 73 Horizontal plane 75 Upper guide surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Tsukiki 8 Tosanagi, Fujisawa-shi, Kanagawa Prefecture Isuzu Motors Fujisawa Plant Co., Ltd. (72) Inventor Koichiro Haranaka 8 Toshiro, Fujisawa-shi, Kanagawa Isuzu Motors Fujisawa Co., Ltd. in the factory

Claims (7)

[Claims] 1. A front end surface having an R, a horizontal surface formed of a horizontal plate connected to the front end surface, and an upper guide surface connected at a predetermined angle to the horizontal surface, the lower surface of the horizontal surface being at least A vehicle under-floor component cooling device configured to mount an upper surface of a horizontal plane to a cross member as a ground height, and to guide a traveling wind under the vehicle floor to an upper guide surface to hit a vehicle under-floor component at a rear portion of the vehicle. 2. The vehicle under-floor component cooling device according to claim 1, further comprising a mounting tool mounted on a horizontal surface of the vehicle under-floor mounting member. 3. The underfloor part cooling device according to claim 1, wherein a notch is provided on the upper guide surface, and the notch is located at a portion where the part interferes with the underfloor part. 4. The under-floor component cooling device according to claim 1, wherein a connecting piece having a curved surface is interposed between the horizontal surface and the upper guide surface. 5. A drainage mechanism provided on a horizontal surface.
The under-floor component cooling device according to claim 1. 6. An upper guide surface is divided into two in a traveling direction of a traveling wind to form a first guide surface and a second guide surface, and an arrangement angle of the first guide surface and the second guide surface with respect to a horizontal plane is set. 2. The under-floor part cooling device according to claim 1, wherein the cooling device is an under-floor part cooling device. 7. A front end surface having a radius R, and an upper guide surface continuously provided at a predetermined angle to an edge of the front end surface, wherein at least a portion near a continuous portion between the front end surface and the upper guide surface is minimum. A vehicle under-floor component cooling device configured to be mounted on a cross member at a height above the ground so as to guide a traveling wind under the vehicle floor to an upper guide surface and to hit the under-floor components at the rear of the vehicle.