JPH05338573A - Oil cooler of motorcycle - Google Patents

Abstract

PURPOSE:To provide an oil cooler of a motorcycle of which the projection in the vehicle width direction is removed, the construction is simple, the weight is light, and the price is cheap. CONSTITUTION:This oil cooler of a motorcycle is formed so that a down tube 3 extending downward from a head pipe 2 on the front end of a frame 1 is served both as one component of the frame 1 and the passage for lubricating oil, and cooling fins 9 are formed on the down tube 3 in the lengthwise direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle oil cooler.

[0002]

2. Description of the Related Art In some motorcycles, the lubricating oil of the engine is passed through an oil cooler to be cooled to reduce the temperature of the lubricating oil. When using an oil cooler, generally, in the down tube part at the front of the frame,
The oil cooler is attached to the front, the wind received by traveling is applied to the oil cooler to cool the oil cooler, and the cooling of the oil cooler cools the lubricating oil.

[0003]

By the way, the oil cooler is generally a long quadrangle and protrudes to the left and right of the down tube. Therefore, the amount of protrusion in the vehicle width direction was large. In addition, the oil cooler has a mounting structure such as a protective plate mounted around the oil cooler and elasticity provided by a rubber bush. Furthermore, in order to enhance the cooling effect, it is necessary to increase the surface area of the cooling fins. For that, either the number of fins must be increased or the fins themselves must be enlarged. As a result, the structure becomes complicated and the weight of the vehicle becomes large, resulting in high cost.

In view of the above points, an object of the present invention is to provide an oil cooler for a motorcycle which eliminates the amount of protrusion in the vehicle width direction due to the oil cooler, has a simple structure, reduces the vehicle weight, and is inexpensive. ..

[0005]

In order to achieve the above object, an oil cooler for a motorcycle according to the present invention includes a down tube extending downward from a head pipe portion at a front end of a frame, which is a lubricating oil other than one component of the frame. It also serves as a passage. The down tube has cooling fins extending in the longitudinal direction thereof.

Further, the down tube may be provided with a forward path and a backward path of the lubricating oil in the longitudinal direction thereof. In this case, a cooling fin is provided on the outer side of the down tube so that the forward path and the return path communicate with each other at the upper end, and the forward path and the lower ends of the return path are connected to an oil tank by a hose. Further, the cooling fin may be detachably attached to the down tube, or a heat conductive sheet may be interposed between the cooling fin and the down tube.

[0007]

In addition to the one component of the frame, the down tube serves as a passage for the lubricating oil, so that the number of components is reduced. Further, since the cooling fin is formed by extending in the longitudinal direction of the down tube, if the cooling fin has the same cooling area, the protrusion amount in the vehicle width direction can be small.

Further, the lubricating oil that has entered the lower side of the outward path of the down tube through the hose connected to the oil tank rises through the outward path and enters the return path at the upper end of the down tube. After that, it descends through this return path and returns to the oil tank from the lower side of the return path of the down tube through a hose connected to the oil tank.

A cooling fin is provided on the outside of the down tube, and the cooling fin is cooled by the wind received during traveling. Therefore, the lubricating oil flows in the forward path and the return path by the cooling fin. Be cooled in between. Also,
Since the cooling fin is detachably attached to the down tube, only the cooling fin can be removed from the frame when the cooling fin fails. Therefore, it is not necessary to remove the cooling fin together with the down tube from the frame. Furthermore, since a heat conductive sheet may be interposed between the cooling fins and the down tube, the heat conductivity is further improved.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5 show a first embodiment of the present invention. A down tube 3 is extended downward from a head pipe 2 portion to which a front fork of a front end of the frame 1 is attached, and front ends of left and right lower tubes 4 are welded to lower ends of the down tube 3. The down tube 3 is a pipe having a rectangular cross section in which a partition wall 5 is integrally formed in the center in the longitudinal direction. The down tube 3 has a forward passage 6 of lubricating oil, a rear passage 7 and a communication hole at the upper end. 8, and the upper and lower ends have a closed cross section. Then, several cooling fins 9 are provided on the front side of the down tube 3 in a protruding manner. An oil tank 10 is attached between the front portions of the lower tubes 4, and the lower ends of the forward path 6 and the return path 7 are respectively connected to the hose 1
Connect to the oil tank 10 at 1. In this way, the down tube is a component of the frame and also serves as a lubricating passage for the lubricating oil.

The lubricating oil circulates from the oil tank 10 back through the forward path 6 and the return path 7 of the down tube 3, and while passing through the down tube 3, heat is taken by the cooling fins 9. To be cooled. The cooling fins 9 are cooled by the wind received during traveling. The cooling fin 9 is
Although it is provided only on the front side so that the wind received during traveling is easy to hit, it may be provided on the rear side or side.

FIG. 6 shows a second embodiment of the present invention. In this case, the oil supply port 12 is provided in the rear portion of the head pipe 2 on the upper side of the down tube 3 so that the outward path 6 and the return path 7 are communicated with each other. Others are the same as those shown in FIGS. 1 to 5.

FIG. 7 shows a third embodiment of the present invention. In this case, the down tubes 3 are paired left and right, the left side is the forward path 6 and the right side is the return path 7, and the upper ends are connected by the communication pipe 13. The lower ends of the pair of left and right town tubes 3 are The lower end of the lower tube 4 is welded. Others are the same as those shown in FIGS. 1 to 5.

8 and 10 show a fourth embodiment of the present invention. In the first to third embodiments, the cooling fin is formed integrally with the down tube, but the fifth and sixth embodiments after the description of the fourth embodiment and the fourth embodiment are shown. In the embodiment, the cooling fin and the down tube are shown as separate bodies.

The down tube 3A is a component of the frame 1 and also has a function as a return path for the lubricating oil. The lower end of the down tube 3A is connected to an oil tube 14a leading to an oil tank (not shown). The down tube 3A has a square cross section, and a flat front surface 15 is attached with a cooling fin which will be detachably attached to the down tube 3A. A plurality of attachment bushes 17, 17, ... Are attached to the front surface 15 at appropriate intervals by an appropriate fixing means such as press fitting or welding (see FIG. 10).

The mounting bush 17 has a screw hole 17 in it.
a is formed, and a bolt 19 for attaching the cooling fin to the down tube 3A is screwed into the screw hole 17a.

The cooling fin 21 is made of an aluminum extruded material and has a channel shape. The contact surface 21a contacting the down tube 3A is flattened in the same manner as the down tube 3A and is almost the same as the down tube 3A. Have the same length. Further, a plurality of partition fins 23, 23 ... Are arranged in the groove floor portion 22 at predetermined intervals in the width direction and the longitudinal direction of the groove floor portion 22. Between these partition fins 23, 23, ..., there are provided a plurality of mounting holes 25, 25, ... Perforated at the same intervals as the intervals at which the above-mentioned mounting bushes 17, 17 ,.

The reference numerals 27, 27, ... Show a plurality of washers placed corresponding to the mounting holes 25, 25 ,. The heat conductive sheet 28 is a sheet-shaped thin piece made of silicon, and has the same width and the same length as the cooling fins 21. The fixing holes 29, 29, ...
... is formed.

The reinforcing plate 30 is a reinforcing material that connects the down tube 3A and the main frame portion 32. A forward path of the lubricating oil is formed in the reinforcing plate 30 and communicates with the return path of the down tube 3A. Further, an oil tube 14b for the outward path is connected to the lower portion of the reinforcing plate 30, and the oil tube 14b for the outward path also communicates with the oil tank (not shown).

However, in the fourth embodiment,
The heat conductive sheet 28 is provided between the contact surface 21a of the cooling fin 21 and the front surface 15 of the down tube 3A, and the fixing hole 29 thereof is provided.
··············· s down bush 3A mounting bush
・ 17.
・ ... In this state, attach each bolt 19 to the washer 2
7 ・ 27 ・ ・ ・ ・ -Mounting hole 25 ・ 25 ・ ・ ・ ・ -Fixing hole 29.2
Insert in the order of 9 ..., and finally the mounting bush 1
.. are screwed together with the screw holes 17a, 17a ,. In this way, the cooling fin 21 is attached to the down tube 3A.

In the fourth embodiment, since the cooling fin 21 is detachably attached to the down tube 3A through the screwing means such as the bolt 19, the cooling fin 2
If 1 fails, only the cooling fin 21 can be removed from the frame 3A. Therefore, it is not necessary to remove the cooling fin 21 together with the down tube 3A from the frame 1, and the work is simplified.

The down tube 3A and the cooling fin 2
1 has a flat surface in contact with 1 and a heat conductive sheet 28 made of silicone is interposed between the two so that the down tube 3A and the cooling fin 21 come into close contact with each other and the heat conduction is further improved. ..

Therefore, the cooling fins 21 themselves can be made smaller, or the number of partition fins 23, ... Can be reduced, so that the structure is simple and the weight of the vehicle can be reduced.

FIG. 11 shows a fifth embodiment of the present invention. This fifth embodiment is different from the fourth embodiment in that
Since only the cooling fin mounting means to the down tube and the partition fins formed in the groove floor are provided, the same reference numerals are given to the other same portions and the description thereof will be omitted.

The down tube 3B has a circular cross section. The cooling fins 21 are provided on both sides thereof.
A plurality of mounting brackets 36 having fixing holes 34 for mounting B are welded at appropriate intervals in the longitudinal direction. In the cooling fin 21B, the contact surface 21b with the down tube 3B is curved to match the curved surface of the down tube 3B. Further, on both side edges of the cooling fin 21B, side edge pieces 38, 38 (having a plurality of mounting holes 37, 37, ... Perforated at locations corresponding to the respective fixing holes 34 of the mounting brackets 36, 36 ,. Only the one on one side is shown.) Is integrally formed along the longitudinal direction of the cooling fin 21B.

Since the side edge pieces 38, 38 are provided in the fifth embodiment, the plurality of mounting holes 2 provided between the partition fins 23, 23, ... Of the groove floor portion 22 in the fourth embodiment.
No need for 5.25 ... Therefore, the partition fins 23B, 23B, ... Of the fifth embodiment are not interrupted on the way,
It becomes a long fin along the longitudinal direction of the cooling fin 21B. Therefore, the partition fin 23 in the fifth embodiment
B23B ... Extend in the longitudinal direction of the groove floor portion 22B and are formed at predetermined intervals in the width direction.

The heat conductive sheet 28B is also the down tube 3
It is curved according to the sectional shape of B. Thus, the down tube 3B and the cooling fin 21B have the side edge pieces 38.3 with the heat conductive sheet 28B sandwiched therebetween.
8 mounting holes 37, 37, ... and a mounting bracket 36.
Through the fixing holes 34 of 36 ...
... and washers 27, 27 ... Even in the fifth embodiment, the same effect as the fourth embodiment can be obtained.

12 and 13 show a sixth embodiment of the present invention. The sixth embodiment is different from the fifth embodiment only in the means for attaching the cooling fins to the down tube and the lubrication mode of the lubricating oil. Is omitted.

In the sixth embodiment, the mounting band 3
The cooling fins 21C are attached to the down tube 3C by means of 9.39 ... Mounting band 3
9 is two substantially C-shaped split bands 40 and 40
Consists of. The split band 40 has a claw piece 42 formed at one end thereof to be engaged with a plurality of hook holes formed on the side edges of the cooling fins described later, and the split band 40 is integrated with the screw 43 at the other end. The connecting piece 44 of is formed.

The cooling fin 21C is different from the cooling fin 21B only in that the mounting holes 37, 37, ... Of the fifth embodiment are replaced by a somewhat larger hooking hole 44 so that the claw piece 42 can be inserted therein.

The down tube 3C is almost the same as the down tube 3 in the first embodiment, and a partition wall 5C is formed therein, and the partition wall 5C allows the lubricating oil to flow through the down tube 3C for both forward and return passages. It is different from that of the fifth embodiment in that a passage is formed and that each forward and return hoses 11C communicating with the oil tank are connected at the lower end of the down tube 3C.

However, in the sixth embodiment,
After sandwiching the heat conductive sheet 28B between the down tube 3C and the cooling fin 21C, hook the respective claw pieces 42 of the split bands 40, 40 of the mounting band 39 into the corresponding hook holes 44 of the cooling fin 21C, and then screw. The divided bands 40 and 40 are connected by 43. By doing so, the heat conductive sheet 28B and the cooling fins 21C are formed.
Is attached so as to be pressed against the down tube 3C. Other operational effects are similar to those of the fifth embodiment. A series of arrows in the first to sixth embodiments show the flow of lubricating oil.

[0033]

According to the oil cooler for a motorcycle of the present invention, the down tube serves as a passage for lubricating oil in addition to one component of the frame, so that the number of parts is reduced, so that the structure can be simplified and the weight of the vehicle can be reduced. You can

Further, since the cooling fins are formed by extending in the longitudinal direction of the down tube, if the cooling fins have the same cooling area, the amount of protrusion in the vehicle width direction can be small. The protrusion can be eliminated.

Further, the lubricating oil that has entered the lower side of the outward path of the down tube through the hose connected to the oil tank rises through the outward path and enters the return path at the upper end of the down tube. After that, it descends through this return path and returns to the oil tank from the lower side of the return path of the down tube through a hose connected to the oil tank. A cooling fin is provided on the outer side of the down tube, and the cooling fin is cooled by the wind received during traveling, so that the lubricating oil is cooled by the cooling fin while flowing through the outward path and the return path. .. Therefore, the down tube can be utilized for cooling the lubricating oil.

Further, since the cooling fin is detachably attached to the down tube, only the cooling fin can be detached from the frame when the cooling fin fails. Therefore, it is not necessary to remove the cooling fin together with the down tube from the frame. Therefore, workability can be improved.

Furthermore, since a heat conductive sheet may be interposed between the cooling fins and the down tube, the heat conductivity is further improved. Therefore, the size of the fins or the number of fins can be reduced by the amount that the thermal conductivity is improved, so that the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a front view showing a first embodiment of the present invention.

FIG. 3 is a cross-sectional view of the lower portion of the down tube showing the first embodiment of the present invention.

FIG. 4 is a vertical sectional side view of the lower portion of the down tube showing the first embodiment of the present invention.

FIG. 5 is an overall side view showing the first embodiment of the present invention.

FIG. 6 is a vertical sectional side view showing a second embodiment of the present invention.

FIG. 7 is a perspective view showing a third embodiment of the present invention.

FIG. 8 is an overall perspective view showing a fourth embodiment of the present invention.

FIG. 9 is an exploded perspective view of FIG.

10 is a cross-sectional view taken along the line AA of FIG.

FIG. 11 is an exploded perspective view showing a fifth embodiment of the present invention.

FIG. 12 is a perspective view showing a sixth embodiment of the present invention.

13 is a cross-sectional view taken along the line BB of FIG.

[Explanation of reference numerals] 1 frame 2 head pipe 3 down tube 6 outward path 7 return path 9 cooling fin 10 oil tank 11 hose 3A down tube 21 cooling fin 28 thermal conductive sheet 3B down tube 21B cooling fin 28B thermal conductive sheet 3C down tube 21C cooling fin

Claims (4)

[Claims] 1. An oil cooler for a motorcycle, wherein a down tube extending downward from a head pipe portion at a front end of a frame is also used as a passage for lubricating oil in addition to one component of the frame, and a cooling fin is formed in a longitudinal direction of the down tube. .. 2. A forward passage and a return passage of lubricating oil are provided in a length direction in a down tube extending downward from a head pipe portion at a front end of the frame, and cooling fins are provided on the outside of the down tube so as to project from the forward passage and the return passage. An oil cooler for motorcycles in which the upper end is connected to the upper end and the lower ends of the forward and return paths are connected to an oil tank by a hose. 3. The oil cooler for a motorcycle according to claim 1, wherein the cooling fin is detachably attached to the down tube. 4. The oil cooler for a motorcycle according to claim 1, wherein a heat conductive sheet is interposed between the cooling fin and the down tube.