JP2019002344A - Vehicle body structure of motor cycle - Google Patents

Abstract

To provide a vehicle body structure of a motor cycle having high protection effect which inhibits influence of vibration on a vehicle body structure.SOLUTION: A vehicle body structure of a motor cycle includes: an L shaped bracket 29 having a bending part 32; a vehicle body frame 22 having a bracket attachment piece 33 for attaching the L shaped bracket 29; a first structure 15 attached to a first structure attachment part 30a formed at one piece of the L shaped bracket 29; and a second structure 25 attached to a second structure attachment part 31a formed at the other piece of the L shaped bracket 29. An attachment part 30b to the bracket attachment piece 33 is formed at a position of the one piece 30 of the L shaped bracket 29 which is located closer to the bending part 32 than the first structure attachment part 30a. The attachment part 30b to the bracket attachment piece 33 is attached to the bracket attachment piece 33. A weight of the second structure 25 is lighter than a weight of the first structure 15.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle body structure of a motorcycle in which an oil cooler or the like is mounted and mounted at an appropriate position of a vehicle body frame.

  Conventionally, for example, in a motorcycle disclosed in Patent Document 1, an oil cooler is disposed in front of an engine body and on the right side of a down pipe so as to be attached to the down pipe. In this case, the oil cooler is supported by the down pipe via the bracket.

Japanese Patent No. 50255582

  In the conventional vehicle body structure as described above, the oil cooler is lightweight, and vibration from the vehicle body frame is easy to propagate. Therefore, the influence on the oil cooler due to the vibration is large, and there are problems such as causing damage to specific portions constituting the oil cooler, in particular, the oil inlet and the oil outlet.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle body structure for a motorcycle having a high protection effect that suppresses the influence of vibration on the vehicle body structure.

  A motorcycle body structure of the present invention is formed on an L-shaped bracket having a bent portion, a vehicle body frame having a bracket mounting piece for mounting the L-shaped bracket, and one piece of the L-shaped bracket. A first structure attached to the first structure attachment portion, and a second structure attached to a second structure attachment portion formed on the other piece of the L-shaped bracket. An attachment portion to the bracket attachment piece is formed at one position of the bracket closer to the bent portion than the first structure attachment portion, and the attachment portion to the bracket attachment piece is attached to the bracket attachment piece. The weight of the second structure is lighter than the weight of the first structure.

  In this invention, the transmission vibration reduction effect to the 2nd structure lighter than a 1st structure is acquired, and the failure | damage of a 2nd structure can be prevented.

2 is a left side view showing a vehicle body structure of a motorcycle as an application example of the present invention. 1 is a front view showing a vehicle body structure of a motorcycle according to the present invention. It is a perspective view which shows the example of a support structure around the oil cooler in the vehicle body structure of this invention. It is a perspective view which shows the example of a support structure by the L-shaped bracket in the vehicle body structure of this invention. It is a perspective view which shows the example of a support structure by the L-shaped bracket in the vehicle body structure of this invention. It is a perspective view which shows the example of a support structure by the L-shaped bracket in the vehicle body structure of this invention. It is a disassembled perspective view which shows the structural example of the L-shaped bracket in the vehicle body structure of this invention. It is a front perspective view around the oil cooler in the embodiment of the present invention. It is a back perspective view around the oil cooler in the example of the present invention. It is an expanded sectional view near the oil inflow port of the oil cooler in the example of the present invention. It is sectional drawing which shows the internal structure of the oil cooler in the Example of this invention. It is sectional drawing which shows the internal structure of the oil cooler in the Example of this invention.

Hereinafter, preferred embodiments of a vehicle body structure of a motorcycle according to the present invention will be described with reference to the drawings.
A motorcycle body structure according to an embodiment of the present invention includes an L-shaped bracket having a bent portion, a vehicle body frame having a bracket mounting piece for mounting the L-shaped bracket, and the L-shaped bracket. A first structure attached to a first structure attachment portion formed on one piece of the L-shaped bracket, and a second structure attached to a second structure attachment portion formed on the other piece of the L-shaped bracket. . An attachment portion to the bracket attachment piece is formed on one piece of the L-shaped bracket at a position closer to the bent portion than the first structure attachment portion, and the attachment portion to the bracket attachment piece is the bracket attachment portion. Attached to the piece, the weight of the second structure is lighter than the weight of the first structure.

  In the motorcycle body structure of the present invention, the first structure of the first structure and the second structure attached to the one piece and the other piece of the L-shaped bracket absorbs vibration from the body frame, and Makes it difficult for vibration to be transmitted to the two structures. Thereby, the transmission vibration reduction effect to the second structure lighter than the weight of the first structure can be obtained, and damage to the second structure can be prevented.

  In the drawings used in the following description including FIG. 1 and FIG. 2, the direction in which the rider riding the motorcycle 10 sees the front of the vehicle is defined as the front, and the opposite direction is defined as the rear. Also, the rider's right side is on the right and the left side is on the left, and these directions are indicated by arrows as needed. FIG. 1 is a left side view showing a vehicle body structure of a motorcycle 10 as an application example of the present invention, and FIG. 2 is a front view showing a vehicle body structure of the motorcycle 10. First, the configuration of the main part of the motorcycle 10 will be described with reference to FIGS. 1 and 2.

  The motorcycle 10 is configured by forming a vehicle body skeleton by a vehicle body frame 11 made of steel or aluminum alloy, and mounting various parts on the vehicle body frame 11. A main frame 13 extends obliquely downward and rearward from the steering head pipe 12 coupled to the front upper end portion of the vehicle body frame 11, and a seat rail 14 and the like are coupled to the vicinity of the rear portion of the main frame 13. The power unit including the engine 15 is supported by the vehicle body frame 11 at a substantially central portion of the vehicle body.

  In the following description, a required vehicle body structure is illustrated, but the steering head pipe 12 supports the front fork so as to be turnable in the left-right direction, and a handle bar is coupled to the upper end side of the front fork. A front wheel is rotatably supported at the lower end of the front fork. The upper part of the front wheel is covered with a front fender. A swing arm swingable up and down via a pivot shaft 16 is supported by the vehicle body frame 11 behind the engine 15, and a rear wheel is rotatably supported at the rear end of the swing arm. A shock absorber is mounted between an appropriate position in the middle part of the swing arm in the front-rear direction and the body frame 11 side, and the rear wheel is covered with a rear fender. A seat on which a rider sits is arranged on the seat rail 14 above the rear wheel.

  The engine 15 is a four-cycle single cylinder (or more than two cylinders) engine, and may be a water-cooled or air-cooled engine. In the basic configuration of the engine 15, a crankcase 17 that rotatably supports and accommodates a crankshaft horizontally disposed in the left-right direction, and an upper portion of the crankcase 17 are coupled to each other so that an axis thereof is inclined forward and substantially vertically. And a cylinder block 18 set in a direction. Further, the engine 15 includes a cylinder head 19 coupled to the upper portion of the cylinder block 18 and a cylinder head cover 20 that covers the cylinder head 19.

  The area around the vehicle body frame 11 will be described. The vehicle body frame 11 in this embodiment may be a backbone (diamond frame) type, for example, or a single cradle type or the like can be selected. A main frame 13 extending obliquely downward and rearward from the steering head pipe 12 is curved downward substantially at the center in the front-rear direction of the vehicle, and a pair of side frames 21 projecting left and right near the lower end thereof are It joins so that it may show a general portal type in the direction view. A plurality of engine mount brackets project from the main frame 13 and the side frame 21 to support the engine 15. The down frame 22 extends straight from the steering head pipe 12 obliquely downward to the rear, and the down frame 22 supports the front portion of the crankcase 17 of the engine 15 via a bracket 23 for engine mounting. The down frame 22 constitutes a part of the vehicle body frame 11.

  A pair of left and right seat rails 14 are coupled near the rear portion of the main frame 13, and the seat rails 14 extend to above the rear wheels. The main frame 13 and the pair of seat rails 14 are joined in a Y shape in a top view. Further, a pair of left and right pillars 24 are coupled to the vicinity of the gate-shaped shoulder portion of the side frame 21, and these pillars 24 are coupled to the vicinity of the rear end of the seat rail 14. A vehicle body frame 11 having a three-dimensional structure is constituted by these frame members, and high support rigidity for the engine 15 is ensured.

  Lubricating oil is supplied to a peripheral portion of the crankshaft in the engine 15 (specifically, a journal bearing, a crankpin bearing, etc.), a transmission, and a valve operating device in the cylinder head 19 in the lubrication system of the engine 15. The An oil cooler 25 for cooling the lubricating oil supplied to each part of the engine 15 is provided, and the oil cooler 25 has a rectangular shape that is long in the vertical direction when viewed from the front of the vehicle as a vehicle body structure. Presents. The oil cooler 25 is mounted on the left side of the down frame 22 in a moderately forwardly inclined posture so as to follow the down frame 22.

  As the basic lubricating oil circulation in the engine 15, the lubricating oil in the oil pan in the engine 15 is sucked out by the oil pump, and the lubricating oil cleaned by the oil filter is supplied to the oil cooler 25 via the inlet hose 26. Flow into. Lubricating oil that has flowed into the oil cooler 25 is cooled by traveling air that strikes the oil cooler 25 while flowing through the oil cooler 25, and then returned to the engine 15 via the outlet hose 27.

  As shown in FIG. 3, the oil cooler 25 is supported by the down frame 22 through brackets 28 and L-shaped brackets 29 attached to the down frame 22 at two locations above and below the rectangular long side on the down frame 22 side. The bracket 28 is formed by bending a thin steel plate or the like as shown in FIG. 4, is welded near the upper portion of the down frame 22, protrudes to the left, and is coupled to the upper right side portion of the oil cooler 25.

  Next, the L-shaped bracket 29 will be described. 5A to 5C are perspective views showing the periphery. Further, referring to these drawings, the L-shaped bracket 29 is formed by bending a thin steel plate material or the like, and the one-side piece 30 (one piece) on which the first structure attachment portion 30a is formed and the first piece. The two-structure attachment portion 31a is formed integrally with the other-side piece 31 (the other piece) on which the two-structure attachment portion 31a is formed. The piece 30 and the piece 31 are bent at the bent portion 32 so that the sandwiching angle between them is approximately 90 °, and are formed to be tapered from the bent portion 32 as a starting point. The single body 30 is disposed along the front-rear direction, and the single body 31 is disposed along the left-right direction.

  The L-shaped bracket 29 is coupled to the down frame 22 via a bracket mounting piece 33. The bracket mounting piece 33 is formed by bending a thin steel plate material or the like, welded to the down frame 22 as shown in FIG. 5C, and protrudes rearward, and has a contact portion 33a with the piece 30 near the rear portion. . On the other hand, the half body 30 is formed with a mounting portion 30b to the bracket mounting piece 33 at a position closer to the bent portion 32 than the first structure mounting portion 30a, and this mounting portion 30b is a contact portion of the bracket mounting piece 33. The abutting members 33a are fastened to each other by a plurality of bolts 34. The piece 30 and the bracket attachment piece 33 are formed with an insertion hole 35 and an insertion hole 36 for passing the bolt 34, respectively. Further, the bent portion 30 c provided on the upper portion of the piece 30 and the bent portion 33 b provided on the upper portion of the bracket mounting piece 33 are overlapped with each other. When the piece 30 and the bracket attachment piece 33 are fastened, the nut 37 is screwed onto the bolt 34 on the back side of the bracket attachment piece 33 as shown in FIG. 5B.

  Here, in this embodiment, the engine 15 is the first structure attached to the first structure attachment portion 30a of the single body 30, and specifically, the cylinder head 19 of the engine 15 as shown in FIG. As shown in FIG. 4, the first structure attachment portion 30 a of the piece 30 and the cylinder head 19 are fastened by the bolt 38. In this case, an insertion hole 39 through which the bolt 38 is passed is formed in the first structure mounting portion 30a of the single body 30, and a boss 40 protruding forward is provided in the front portion of the cylinder head 19, and the boss 40 is formed with a screw hole 41 into which the bolt 38 is screwed. The boss 40 is an engine suspension.

Moreover, it is the oil cooler 25 as a 2nd structure attached to the 2nd structure attachment part 31a of the piece 31 and, specifically, is a lower right side part of the oil cooler 25 as shown in FIG. In this case, a pair of upper and lower stays 42 are attached to the right side surface portion of the oil cooler 25, and the second structure attachment portion 31 a of the piece 31 and the lower stay 42 are fastened by the bolts 43. The bracket 28 and the upper stay 42 are fastened by bolts 43. The bracket 28 and the single body 31 are formed with an insertion hole 44 and an insertion hole 45 for allowing the bolts 43 to pass (FIG. 4).
Here, the weight of the second structure, that is, the oil cooler 25 is lighter than the weight of the first structure, that is, the engine 15.

  6 to 10 show specific examples of the oil cooler, FIG. 6 is a front perspective view of the oil cooler, FIG. 7 is a rear perspective view of the oil cooler, and FIG. 8 is an enlarged sectional view of the vicinity of the oil inlet. is there. FIG. 9 is a cross-sectional view showing the internal structure of the oil cooler, and FIG. 10 is a cross-sectional view showing the internal structure of the oil cooler. In each figure, the direction when the oil cooler 25 is mounted on the motorcycle 10 is indicated by an arrow. The oil cooler 25 has an oil inlet 46 at one end on one long side of the rectangle and an oil outlet 47 at the other end. Thus, the oil cooler 25 has an oil inlet 47 at two separate ends on one side of the rectangle. An inlet 46 and an oil outlet 47 are provided. Stays 42 are arranged adjacent to the sides of the oil inlet 46 and the oil outlet 47, and the bracket 28 and the L-shaped bracket 29 are coupled to each stay 42 as described above.

  When connecting each stay 42 to the bracket 28 and the L-shaped bracket 29, the stays 42 are fastened by bolts 43. A rubber bush 48 is attached to the bolt insertion hole of each stay 42 as shown in FIG. By mounting the rubber bush 48, the oil cooler 25 is supported in a floating manner via the stay 42.

  A cooling cooler fan 49 is attached to the back of the oil cooler 25 as shown in FIG. The cooler fan 49 is an electric type having a built-in electric motor for driving the fan, and the electric motor is appropriately driven and controlled by a control device (ECU; Engine Control Unit) using a battery mounted on the motorcycle 10 as a power source.

As shown in FIG. 6 and the like, by screwing an eyebolt 52 fitted with an eye joint 51 to a nut 50 fixed to one side of the long side of the oil cooler 25 at the oil inlet 46, The eye joint 51 is fixed. Note that washers 53 (see FIG. 8) are mounted on both sides of the eye joint 51. The eyebolt 52 is formed with a plurality of communication holes 52a communicating between the hollow interior of the eyebolt 51 and the hollow interior of the eye joint 51. Flow into.
The oil outlet 47 is also configured substantially in the same manner as the oil inlet 46, that is, the eye joint 51 ′ is fitted to the nut 50 ′ fixed to the other side surface of the long side of the oil cooler 25. The eye joint 51 ′ is fixed by screwing the eye bolt 52 ′. Then, the lubricating oil circulated through the oil cooler 25 flows out to the outlet hose 27 via the eyebolt 52 ′.

  As shown in FIG. 6 or 7, a plurality of brackets 53 projecting from the outer periphery of the cooler fan 49 and a plurality of stays 54 attached to the oil cooler 25 corresponding to these brackets 53 are fastened by bolts 55. Thus, the cooler fan 49 is attached to the back surface of the oil cooler 25.

As shown in FIGS. 9 and 10, a plurality of oil tubes 56 formed so as to extend along the long side direction of the rectangle of the oil cooler 25 are arranged in multiple stages in the short side direction of the rectangle. 56 communicate with each other at one end and the other end of the oil cooler 25. In FIG. 10, as a typical configuration example, an oil tube 56 </ b> A is schematically shown by a dotted line, and has a connecting portion 56 a that bulges corresponding to the oil inlet 46 side and the oil outlet 47 side. The other oil tubes 56 have the same configuration. Adjacent oil tubes 56 are connected to each other via a connecting portion 57 in the connecting portion 56a, and are arranged in multiple stages as described above.
The lubricating oil that has flowed into the oil cooler 25 from the oil inlet 46 circulates in each oil tube 56 as indicated by the dotted arrow in FIG. 9 and flows out to the oil outlet 47.

  In the motorcycle 10 of the present invention, when the engine 15 is started, the lubricating oil in the engine 15 is sucked out by the oil pump and flows into the oil cooler 25 through the inlet hose 26. Lubricating oil that has flowed into the oil cooler 25 is cooled by traveling air that strikes the oil cooler 25 while flowing through the oil cooler 25, and then returned to the engine 15 via the outlet hose 27. Of the first structure and the second structure attached to the one piece and the other piece of the L-shaped bracket 29 after the engine 15 is started, the first structure absorbs vibrations from the vehicle body frame 11, and the second structure Makes it difficult for vibration to be transmitted to objects. Thereby, the transmission vibration reduction effect to a 2nd structure is acquired, and the failure | damage of a 2nd structure can be prevented.

  Specifically, the weight of the second structure, that is, the oil cooler 25 is lighter than the weight of the first structure, that is, the engine 15. A lightweight object that is easily damaged is attached to a piece 31. And the vibration transmission to the lightweight thing which is easy to be damaged is suppressed by taking the vehicle body structure which attached the bending part 32 vicinity of the L-shaped bracket 29 to the down frame 22 contained in the vehicle body frame 11.

  As described above, the oil cooler 25 can be prevented from being damaged as an effect of reducing the transmission vibration to the oil cooler 25. More specifically, damage to parts that are easily damaged by vibrations such as the connecting portion 57 of the oil tube 56 of the oil cooler 25, the oil inlet 46 (oil inflow portion 58), and the oil outlet 47 (oil outflow portion 59). Can be prevented.

The L-shaped bracket 29 (one piece 30) fixes the boss 40 of the cylinder head 19 after the engine 15 is arranged on the vehicle body frame 11, and sandwiches the boss 40 as an engine suspension portion. Preliminary accuracy in the direction width is not required, increasing productivity.
In this case, the tightening force of the engine suspension is increased, and the vehicle body frame 15 and the engine 11 can be fixed with high rigidity.

The oil cooler 25 has an oil inlet 46 and an oil outlet 47 at two end portions on one side thereof, and the side of the oil outlet 47 is fixed by an L-shaped bracket 29 via a stay 42. It has a structure to do.
By fixing with the L-shaped bracket 29 in this way, the effect of reducing the transmission vibration to the connecting portion 57 between the oil tubes 56, the oil inlet 46 and the oil outlet 47 which are particularly easily damaged in the structure of the oil cooler 25. Will increase. And the high damage prevention effect of these easily damaged parts is acquired by aiming at reduction of transmission vibration.

  Here, in the modified example of the present invention, the engine 15 is fastened and fixed by sandwiching both sides of the boss 40 that is the engine suspension portion with the L-shaped bracket 29. In this case, in the above embodiment, as shown in FIG. 3 or FIG. 5C, the single piece 30 is fastened to the boss 40 from the left side, but the L-shaped bracket having the single piece 30 and the single piece 31 having the same configuration. 29 is added to the right side of the boss 40 substantially symmetrically. Then, the added piece 30 is fastened to the boss 40 so that the piece 30 is applied from the right side.

Also in this case, when the boss 40 of the cylinder head 19 is fixed, it is not necessary to obtain the accuracy in the width in the sandwiching direction from the left and right sides by the two pieces 30 with respect to the boss 40, and the productivity is increased.
Further, the tightening force of the engine suspension is increased, and the vehicle body frame 15 and the engine 11 can be fixed with high rigidity.

  In another modification of the present invention, both the side of the oil inlet 46 and the side of the oil outlet 47 are fixed by the L-shaped bracket 29. In this case, the L-shaped bracket 29 is coupled to the stay 42 disposed adjacent to the side of the oil inlet 46. That is, both the oil inlet 46 and the oil outlet 47 are fastened by the L-shaped bracket 29.

  Also in this case, by fixing the oil cooler 25 with the two upper and lower L-shaped brackets 29, the connecting portion 57 between the oil tubes 56, the oil inlet 46 and the oil that are particularly easily damaged in the structure of the oil cooler 25. The effect of reducing the transmission vibration to the outlet 47 is enhanced.

  In any case, as described above, in the present invention, a heavy object and a lightweight object that is easily damaged are arranged via the L-shaped bracket 29 attached to the vehicle body frame 11, and vibration is transmitted to the easily damaged light object. Is suppressed, and breakage of a portion that is easily damaged by vibration can be prevented.

As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
Although the example which is the oil cooler 25 was demonstrated as the 2nd structure in the said embodiment, as another example, when attaching a radiator etc. for cooling water cooling etc., this invention is applicable, and is the same as the said Example. Advantageous effects can be obtained.

DESCRIPTION OF SYMBOLS 10 Motorcycle, 11 Body frame, 12 Steering head pipe, 13 Main frame, 14 Seat rail, 15 Engine, 17 Crankcase, 18 Cylinder block, 19 Cylinder head, 20 Cylinder head cover, 21 Side frame, 22 Down frame, 23 Bracket , 24 pillar, 25 oil cooler, 26 inlet hose, 27 outlet hose, 28 bracket, 29 L-shaped bracket, 30 piece (one piece), 30a first structure mounting portion, 30b mounting portion, 30c bent portion, 31 One piece (the other piece), 31a Second structure mounting portion, 32 bent portion, 33 bracket mounting piece, 33a abutting portion, 33b bent portion, 34 bolt, 35, 36 insertion hole, 40 boss, 41 screw Hole, 44, 45 insertion , 46 Oil inlet, 47 Oil outlet, 48 Rubber bush, 49 Cooler fan, 50 Nut, 51 Eye joint, 52 Eye bolt, 53 Bracket, 54 Stay, 56 Oil tube, 57 Connecting part, 58 Oil inflow part, 59 Oil Outflow part.

Claims (4)

An L-shaped bracket having a bent portion;
A vehicle body frame having a bracket mounting piece for mounting the L-shaped bracket;
A first structure attached to a first structure attachment part formed on one piece of the L-shaped bracket;
A second structure attached to a second structure attachment portion formed on the other piece of the L-shaped bracket;
A mounting portion to the bracket mounting piece is formed at a position closer to the bent portion than the first structure mounting portion on one piece of the L-shaped bracket,
The mounting part to the bracket mounting piece is attached to the bracket mounting piece,
The motorcycle body structure is characterized in that the weight of the second structure is lighter than the weight of the first structure. The vehicle body frame is a down frame;
The first structure is an engine;
The motorcycle body structure according to claim 1, wherein the second structure is an oil cooler.   The motorcycle body structure according to claim 2, wherein the engine is fastened and fixed by sandwiching one or both of the engine suspension portions with the L-shaped bracket. The oil cooler has an oil inlet and an oil outlet at two end portions on one side of the oil cooler,
The vehicle body structure of a motorcycle according to claim 2 or 3, wherein either one or both of the side of the oil inlet and the side of the oil outlet is fixed by the L-shaped bracket.

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