BRPI0909831B1 - cooling fin structure on a motorcycle - Google Patents

Abstract

cooling fin structure on a motorcycle the present invention relates to an internal combustion engine (10) mounted on a motorcycle (1) which has a forward or substantially horizontal cylinder and is provided on its upper surface with a structure cooling vane (31) (31) which includes cooling vane (32) (30) extended in a direction in which the motorcycle (1) advances. reinforcement projections (34) are formed integrally with the cooling fins (30) on the surfaces of the cooling fins (30), such that the reinforcement projections (34) of each cooling fin (30) are separated from the cooling fins (30) adjacent and the reinforcing projections (34) of the adjacent cooling fins (30). the respective reinforcing projections 34 of the adjacent cooling fins (30) are arranged alternately. the respective reinforcing projections (34) of the adjacent cooling fins (30) do not overlap when viewed in one direction along the length of the cooling fins (30). lower walls (35) that continuously extend in the direction of movement of the motorcycle (1) are formed between the adjacent cooling fins (30). sand and mud can hardly accumulate in the cooling vane structure (31), which allows easy cleaning of the cooling vane structure. the structure of the cooling fin can prevent the reduction of its cooling capacity.

Description

DESCRIPTION REPORT OF THE PATENT OF INVENTION FOR STRUCTURE

COOLING FLIP ON A MOTORCYCLE.

Technical Field

The present invention relates to a cooling vane structure for an internal combustion engine to be mounted on a vehicle, such as a motorcycle.

Prior Art

The cylinder block and cylinder head of an internal combustion engine to be mounted on a vehicle, such as a motorcycle, are provided on their surfaces with cooling fins to cool the internal combustion engine by air currents. Since the cooling fins are comparatively thin, adjacent cooling fins are joined by reinforcement ribs to increase the stiffness of the cooling fins, such that the fins are not induced to generate sounds by wind and vibrations and to increase the radiation area of heat by the reinforcement ribs. Such a cooling fin structure is described in Patent Document 1.

Patent Document 1: JP 8-7070 U

Description of the Invention

Problem to be solved by the invention

An internal combustion engine in the vehicle supplied with cooling fins joined by reinforcement ribs on its external surface has an upper surface having recesses demarcated by the cooling fins and reinforcement ribs and arranged in a grid. Sand and mud are prone to accumulate in the recesses and deteriorate the engine's cooling capacity. Furthermore, it is difficult to clean the recesses by removing accumulated sand and mud. An attempt to form part of each of the reinforcement ribs at a much lower height than that of the cooling fins was made with the intention of reducing the adverse effect of such a problem to some extent. However, the recesses remained unchanged and, therefore, the preceding problem could not be completely resolved.

The present invention was created to solve the above problem and the objective of the invention is to provide a cooling vane structure for an internal combustion engine in the vehicle in which sand and mud can hardly accumulate in it and which allows easy cleaning of the cooling fin structure and may prevent cooling reduction. Means for solving the problem

The present invention provides a cooling vane structure for an internal combustion engine in the vehicle, which comprises cooling fins formed in parallel in at least one upper surface of the internal combustion engine in the vehicle, the cooling fins being each provided with reinforcing projections on their surfaces; and the reinforcement protrusions on each cooling fin are separated from adjacent cooling fins and from the reinforcement protrusions on the adjacent cooling fins.

Preferably, the reinforcing projections of the adjacent parallel cooling fins are arranged alternately.

Preferably, the reinforcement projections are formed such that the respective reinforcement projections of the adjacent cooling fins do not overlap when viewed in one direction along the length of the cooling fins.

In one embodiment of the present invention, the internal combustion engine in the vehicle has a cylinder that is tilted forward or substantially horizontal, is suspended from a main chassis that extends obliquely downwards to the rear of a front tube included in a motorcycle and is provided with an air intake system to draw air into the engine, including parts arranged between the top surface of the cylinder head and the main chassis and the cooling fins extend in a direction in which the motorcycle advances.

Typically, the outermost of the cooling fins is not provided with the reinforcement protrusions on at least one outer surface thereof.

Effect of the Invention

The cooling fins in the present invention are provided on their surfaces with the reinforcing projections. Therefore, the stiffness of the cooling fins is increased by the reinforcing protrusions and therefore the fins are prevented from generating sounds and noise (reduction of sounds and noise). Reinforcement bosses increase the surface areas of the cooling fins to improve cooling capacity. The structure of the cooling vane of the present invention differs from the structure of the conventional cooling vane in that the reinforcing ribs on the cooling ribs are separated from adjacent cooling ribs and the reinforcement ribs on the adjacent cooling ribs. Therefore, the adjacent fins are not joined by the reinforcement projections and therefore the cooling fins and reinforcement projections do not form recesses. Consequently, continuous lower walls that extend across the length of the cooling fins are formed between the adjacent cooling fins. In this way, particles of granulation and dust and mud that have entered the spaces between the adjacent cooling fins can hardly accumulate in these spaces and can be easily washed with water even though the particles of granulation and dust and mud accumulate in these spaces.

Since the reinforcing protrusions of the adjacent parallel cooling fins are arranged alternately, the reduction of the sectional area of the air passage between the adjacent cooling fins caused by the reinforcement protrusions can be limited to a lesser extent and comparatively large granulation particles and pieces of mud that have entered the spaces between the adjacent cooling fins are hardly captured by the reinforcement projections, can easily roll in space and can easily leave space. Therefore, the air passages between the adjacent cooling fins can be easily cleaned. Air can flow easily through the air passages because the air passages are not narrowed.

Since the reinforcing protrusions are arranged such that the respective reinforcing protrusions of the adjacent cooling fins do not coincide with respect to the direction along the length of the cooling fins, the cooling air can easily flow through the spaces, each one formed between adjacent cooling fins, sand and mud are rarely trapped in the spaces, each between the adjacent cooling fins and the spaces can be easily cleaned.

The internal combustion engine in the vehicle is suspended from the main chassis which extends obliquely downwards to the rear of the motorcycle's front tube and is provided with an air intake system to pull air into the engine, including parts arranged between the upper surface of the cylinder head and the main chassis. Therefore, rainwater, which has adhered to the main chassis and parts of the air intake system while the vehicle is in motion, drips easily over the cooling vane structure at the top of the internal combustion engine. Rainwater and such that dripped onto the cooling vane structure can easily flow in the direction of movement of the vehicle and separate from the cooling vane structure because the cooling vents and the reinforcement bosses do not form split recesses.

When the outermost cooling fins are not provided with the reinforcement protrusions on at least their outer surfaces, a cooling fin structure with an improved appearance is produced.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a side elevation view of a motorcycle provided with an internal combustion engine that includes a cooling vane structure in a preferred embodiment of the present invention,

Figure 2 is an enlarged side elevation view of part of Figure 1 that includes the internal combustion engine and an intake system,

Figure 3 is a side elevation view of a cylinder block included in the internal combustion engine shown in figure 2,

Figure 4 is a plan view of the cylinder block shown in Figure 3 and having the cooling fin structure of the present invention,

Figure 5 is a sectional view taken on line V-V in Figure 4,

Figure 6 is a top view of the cylinder block when viewed from the front side with respect to the direction of movement and

Figure 7 is a plan view of the internal combustion engine in the vehicle.

Reference Listing

I ... motorcycle,

3 ... front fork,

... front tube,

... main chassis,

... rear chassis,

... internal combustion engine,

II ... crankcase,

... cylinder block,

... cylinder head,

... head cover,

... chain box,

... shock absorber,

... leg protection,

... air intake system,

... cooling fin,

... cooling vane structure,

... cooling fin,

32a ... cooling fin,

32b ... reinforcement rib,

... reinforcement overhang,

... bottom wall,

... cooling fin,

40a ... cooling fin,

40b ... reinforcement rib.

Best Mode for Carrying Out the Invention

A cooling vane structure according to the present invention for an internal combustion engine in the vehicle will be described with reference to the accompanying drawings.

Figure 1 shows a motorcycle provided with an internal combustion engine that includes a cooling vane structure in a preferred embodiment of the present invention. With reference to figure 1, motorcycle 1 has a section of the chassis that includes, as main components, a front fork 3 that supports the front wheel 2, a front tube 4 attached to an upper part of the front fork 3, a main chassis 5 extending obliquely downward to the rear from the front tube 4 and a carrier frame 6 joined at the rear end of the main chassis 5, curved in an upward convex shape and extending obliquely upward towards the rear, which are joined in one unit to form the chassis cut. The upper part of the front fork 3 is swiveled on the front tube 4. A cross handle 7 is arranged above the front tube 4. The seat 8 is arranged above the rear frame 6. A chassis cover is indicated at 9.

The internal combustion engine 10 is arranged under the main chassis 5 and is supported with its cylinder axis tilted forward so that it rises at a slight inclination towards the front or with its geometric axis extended substantially horizontally. The internal combustion engine 10 includes a crankcase 11, a cylinder block 12, a cylinder head 13 and a head cover 14. A chain box 15 extends backwards from the crankcase 11. A rear wheel 16 is supported at a rear end part of the chain box 15. The rear end of the chain box 15 is joined at the rear of the rear chassis 6 by a shock absorber 17. A leg guard 18 extending over the main chassis 5 covers the block of cylinders 12 and the cylinder head 13 of the internal combustion engine 10 against transverse directions. The rear frame 6 is covered with a rear cover 19. Seat 8 is placed on the rear cover 19.

The internal combustion engine 10 is suspended from the main chassis 5. With reference to figure 2 showing part of figure 1 on an enlarged scale, the internal combustion engine 10 has a forward or substantially horizontal cylinder and an inlet system air inlet 20 is connected to an upper part of cylinder head 13. The air inlet system 20 includes an inlet pipe 21, a choke 22, an air filter 23 and so on. Inlet air flows through air filter 23, air inlet system 20 and cylinder head 13 into the cylinder. An injector 24 injects fuel into the intake air. The air inlet system 20 is located below the main chassis 5; that is, the air inlet system 20 is arranged in a space between the main chassis 5 and the cylinder head 13. As shown in figure 7 which shows the internal combustion engine 10 in a flat view, the cooling fins 30 for cooling the air of the internal combustion engine 10 are formed on the upper surface of the cylinder block 12. The cooling fins 30 form a cooling fin structure 31 that characterizes the present invention.

Figure 7 shows the inlet pipe 25 of the air inlet system 20. A fuel pipe 26 to transport the fuel to the injector 24 is connected to a gasket cover 27. In figure 7, a connector is indicated at 28 for the electrical equipment of the injector 24 and at 29 is the choke body. The letter F indicates the imaginary flow of air in the cut of the chassis. As shown, the chassis cover 9 is opened towards the front to facilitate the entry of cooling air.

The structure of the cooling fin 31 will be described with reference to figures 3 to 5. Figure 3 is a side elevation view of the cylinder block 12 taken from the left side of the vehicle. The structure of the cooling fin 31 which includes the cooling fins 30 is formed on the upper surface of the cylinder block 12. In this embodiment, the left side surface of the cylinder block 12 is not provided with any cooling fins. A cylinder sleeve is indicated at 33 defining a cylinder diameter. The cylinder sleeve 33 extends to the rear. As is obvious from figure 4 showing the cooling fin structure 31 in a plan view, the cooling fins 30 of the cooling fin structure 31 are extended parallel to the direction of movement of the vehicle. In this embodiment, the right side surface of the cylinder block 12 is provided with cooling fins 32 as shown in figure 4. The cooling fins 32 will be described later.

As is obvious from figure 4, the number of cooling fins 30 of the cooling fin structure 31 in this embodiment is, for example, six. The parallel cooling fins 30 extend in the direction of the vehicle's movement. Reinforcement projections or protuberances 34 are formed integrally with the cooling fins 30 on the surfaces of the cooling fins 30. Each reinforcement projection 34 extends vertically along the height of the cooling fin 30. The surfaces of the reinforcement projections 34 have the shape of a circular arc in cross section in a horizontal plane. Desirably, the reinforcement projections 34 have a curved section gently rising from the flat surface of the cooling fins 30. It is recommended to avoid the use of reinforcement projections that have a cross-section with corners. The respective reinforcing projections 34 of adjacent cooling fins 30 are not opposed to each other with respect to a direction perpendicular to the cooling fins 30, namely, a direction along the width of the vehicle.

The height of the reinforcement projections 34 is much less than the distance between adjacent cooling fins 30. Therefore, even if the respective reinforcement projections 34 of the adjacent cooling fins 30 are opposite each other with respect to a direction perpendicular to the cooling fins 30, there is a gap between the opposite reinforcement projections 34; that is, the reinforcement projections 34 are formed such that the reinforcement projections 34 of adjacent cooling fins 30 are separated from each other in the state where the respective reinforcement projections 34 of the adjacent cooling fins 30 are not opposed to each other. a direction perpendicular to the cooling fins 30. The reinforcement projections 34 of one of the adjacent cooling fins 30 are not connected to parts of the surface not provided with the reinforcement projections 34 of the other cooling fin 30.

As is obvious from figure 5 which shows an enlarged sectional view taken on line V-V in figure 4, the length of the reinforcement ribs 34 is slightly less than the height of the cooling fins 30 on which the reinforcement ribs 34 are formed. Each reinforcement protrusion 34 rises gradually in a smooth curve of a portion of the cooling fin 30 slightly below the upper edge of the cooling fin 30, extending downwards linearly to a lower wall 35 extended between adjacent cooling fins 30. It is important to determine dimensions such that the respective reinforcing projections 34 of adjacent cooling fins 30 do not overlap when viewed in a direction parallel to the length of the cooling fins 30, namely, in a direction for the paper. When the reinforcement projections 34 are so formed, the straight lower wall 35 which extends continuously in a direction parallel to the length of the cooling fins 30 is formed between adjacent cooling fins 30. The cooling fin 30 on the right end shown in the right half of figure 5 is not provided with the reinforcement bosses 34. Therefore, the bottom right wall 35 appears to be wider than the bottom left wall 35. In reality, the two bosses reinforcement 34 opposite each other in figure 5 are not formed in the same position with respect to the length of the cooling fins 30. Therefore, the width of the lower left wall 35 in each reinforcement projection 34 is really equal to that of the lower right wall 35 The lower walls in zigzag 35 having parts of minimum width corresponding to that width extend in the direction of movement of the vehicle.

Figure 6 is an end view of the cylinder block 12 taken from the front side of the vehicle. The upper surface of the cylinder block 12 is provided with the cooling fin structure 31 which includes the cooling fins 30 and the reinforcement projections 34 as shown in figure 6. A space 39 in which a distributor chain, not shown, is extended is shown on the right side in figure 6, namely, the left side with respect to the direction of movement of the vehicle. As is generally known, the distributor chain is stretched between the drive sprocket, not shown, mounted on the crankshaft maintained in the crankcase 11 and a driven sprocket, not shown, mounted on a camshaft arranged in a camera chamber. set of valves to transmit the rotation of the crankshaft to the camshaft. The cooling fins 32 are shown on the left in figure 6. These cooling fins 32 include vertical cooling fins 32a parallel to the cylinder axis and reinforcement ribs 32b parallel to the cylinder axis and joining the cooling fins. adjacent 32a. The reinforcement ribs 32b have a lower height than that of the cooling fins 32a.

As also shown in figure 6, the lower surface of the cylinder block 12 is provided with cooling fins 40a similar in construction to the cooling fins 32 and reinforcement ribs 40b perpendicular to the geometric axis of the cylinder and joining the adjacent cooling fins 40a. The reinforcement ribs 40b have a lower height than that of the cooling fins 40a. Each reinforcement rib 40b has an outer concave edge. Cooling fins 32 and 40 have cooling fin construction based on basically the same principle as that mentioned in Patent Document 1.

The cooling vane structure in the preferred embodiment of the present invention for an internal combustion engine in the vehicle is formed in the preceding construction. When the vehicle is moving, incoming air flows beyond the cover of the cylinder head 14, cylinder cylinder 13, cylinder block 12 and crankcase 11 to cool the internal combustion engine 10. Reinforcement projections 34 are formed in the surfaces of the cooling fins 30 integrally with them, such that the respective reinforcement projections 34 of the cooling fins 30 are not joined on the adjacent cooling fins 30 and on the reinforcement projections 34 on the adjacent cooling fins 30. Therefore, the stiffness of the cooling fins 30 is increased by the reinforcement projections 34 and the reinforcement projections 34 increase the surface area of the cooling fin structure 31 to improve the cooling capacity. Since the adjacent cooling fins 30, unlike conventional cooling fins, are not joined by the reinforcement ribs 34, the cooling fins 30 and the reinforcement ribs 34 do not form split recesses and the continuous lower walls 35 that extend through of the length of the cooling fins 30 are formed between the adjacent cooling fins 30. Thus, particles of granulation and dust and mud that have entered the spaces between the adjacent cooling fins 30 can hardly accumulate in these spaces and can be easily washed with water even if granulation particles and dust and mud accumulate in these spaces. The reinforcement projections 34 having a gently curved section exert low resistance against the air flow.

The respective reinforcement projections 34 of the adjacent cooling fins 30 are arranged alternately and therefore the reduction of the sectional area of the air passages formed between the adjacent cooling fins 30 by the reinforcement projections 34 can be limited to the smallest extent and particles of comparatively large grains and pieces of mud that have entered the spaces between the adjacent cooling fins 30 are rarely captured by the reinforcement projections 34, can roll easily in the spaces and can easily leave the spaces. Therefore, each of the air passages between the adjacent cooling fins can be easily cleaned. Air can flow easily through the air passages because the air passages are not narrowed.

Since the respective reinforcing protrusions 34 of the adjacent cooling fins 30 do not overlap when viewed in a direction parallel to the length of the cooling fins 30, the cooling air can flow smoothly through all the spaces between the adjacent cooling fins 30 and granulation particles and pieces of mud are rarely trapped in the spaces, so the spaces can be cleaned easily.

In the illustrated embodiment, the internal combustion engine 10 is suspended from the main chassis 5 which extends obliquely downwards to the rear from the front tube 4 of the motorcycle and the air intake system 20 is arranged in the space between the main chassis 5 and the cylinder head 13. Therefore, the rain water that adheres to the main chassis 5 and the air intake system 20 while the vehicle is in motion drips easily over the structure of the cooling fin 31 at the top of the engine. internal combustion 10. Rainwater and such that dripped onto the cooling fin structure 31 can easily flow in the direction of movement of the vehicle and separate from the cooling fin structure 31 because the cooling fins 30 and the reinforcing protrusions 34 do not form divided recesses, but they form the continuous lower walls 35 that extend in the direction of movement.

In the illustrated embodiment shown, for example, the cooling fin 30 on the left end, namely, the cooling fin 30 outermost with respect to the width of the vehicle, is provided with the reinforcement projections 34 on its opposite surfaces as shown in the figure 4. The outermost cooling fin 30 may not be provided with any reinforcement projections 34 at all or it may not be provided with any reinforcement projections 34 only on its outer surface with respect to the width of the vehicle; that is, at least the outer surface, with respect to the vehicle width, of the outermost cooling vane 30 may not be provided with the reinforcement projections 34, which improves the appearance of the engine including the cooling vane structure 31 .

In the preferred illustrated embodiment of the invention, the cooling vane structure is formed only on the upper surface of the cylinder block. The cooling vane structure can also be formed on the upper surface of the cylinder head and, when necessary, the cooling vane structure can be formed on surfaces other than the upper surfaces of the cylinder block and cylinder head.

Claims (5)

1. Cooling fin structure, on a motorcycle (4), provided with a front tube (4), a main chassis (5) slanted downwardly from the front tube (4), and an internal combustion engine ( 10) suspended from the main chassis (5), and having a cylinder head (13) and a cylinder block (12) that includes a forward or substantially horizontal cylinder, in which an air intake system (20) stops pulling air into the engine (10) is provided between an upper surface of the cylinder head (13) and the main chassis (5) and where the cooling vane structure (31) is comprised in a chassis cover ( 9) that opens to the front of the motorcycle to guide air to the cooling vane structure (31), being that: the cooling fin structure (31) includes a plurality of vertical cooling fins (30) on an upper surface of the cylinder block (12) and extended in parallel in a direction in which the motorcycle (1) advances, the fins of cooling (30) in the cylinder block (12) are each provided on their external surfaces with reinforcement projections (34) that extend in a vertical direction of the cooling fins (30), and the reinforcement projections (34) ) on each cooling vane (30) are spaced from adjacent cooling vane (3) and the reinforcement bosses (34) on the adjacent cooling vane (30), characterized by the fact that the respective reinforcement bosses (34) of the parallel adjacent cooling fins (30) are alternately arranged and formed such that the respective reinforcing projections (34) of the adjacent cooling fins (30) do not overlap when viewed in one direction along the length of the cooling fins (3), and the cooling fin structure (31) is positioned at the rear of the air intake system (20). 2. Cooling fin structure (31), according to the Petition 870190080322, of 8/19/2019, p. 4/8 vindication 1, characterized by the fact that one of the outermost cooling fins (30) is not provided with the reinforcement projections (34) on at least one external surface of the same. 3. Cooling fin structure (31), according to the 5 vindication 1 or 2, characterized by the fact that the reinforcement protrusions (34) in the adjacent cooling fins (32) are separated in a direction transversal to the cooling fins (32) by a distance that is greater than the thickness of the tip portions of the cooling fins (32). Cooling fin structure (31) according to any one of claims 1 to 3, characterized in that the plurality of cooling fins (32) has the same length in the direction in which the cylinder extends.