JP2007196972A - Motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motorcycle capable of enhancing motive power performance of the motorcycle by high-outputting an engine and enhancing positional accuracy of a main frame, the engine and a swing arm. <P>SOLUTION: In the motorcycle 10, a main frame 30 and a pivot frame 40 are spaced, the main frame 30 has an engine support part 31 for supporting a rear part of the engine 50 from a rear side of a vehicle body, and the pivot frame 40 has an engine connection part 41 mounted to the rear part of the engine from the rear side of the vehicle body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motorcycle in which a main frame that supports an engine and a pivot frame to which a swing arm that swingably supports a rear wheel is attached are separated from each other.

  2. Description of the Related Art A motorcycle is known that includes a head pipe, a main frame extending downward from the head pipe, an engine having a crankcase and a cylinder, and a pivot frame (footrest). In such a motorcycle, the main frame is fixed to the upper end portion of the crankcase, and the pivot frame is supported by the crankcase via a bracket and a holding plate (for example, see Patent Document 1).

Japanese Patent Application Laid-Open No. 09-123972 (first page, FIG. 1-2)

  By the way, in order to improve the power performance of a motorcycle, when increasing the output of the engine, it is necessary to improve the positional accuracy (dimensional accuracy) of the components from the front wheels to the rear wheels. In this motorcycle, the main frame and the pivot frame are separated from each other, and the main frame and the pivot frame are fastened to the engine crankcase by bolts from the side of the vehicle body. It was not easy to obtain the positional accuracy, particularly the positional accuracy of the main frame, the engine, and the swing arm when assembling. In addition, since the engine is pulled in the front-rear direction by the driving force of the rear wheels, if the driving force increases, it is necessary to consider the positional deviation of the main frame, the engine, and the swing arm.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to improve the power performance of a motorcycle by increasing the output of the engine and to improve the positional accuracy of the main frame, the engine, and the swing arm. An object is to provide a motorcycle that can improve the performance.

  In order to achieve the above object, the invention according to claim 1 is a pivot frame to which a main frame extending from a head pipe and supporting an engine, and a swing arm supported by the engine and swingably supporting a rear wheel is mounted. And the main frame has an engine support portion that supports the rear portion of the engine from the rear of the vehicle body, and the pivot frame is mounted on the rear portion of the engine from the rear of the vehicle body. It has the engine connection part attached.

  The invention according to claim 2 is characterized in that, in addition to the configuration of the invention according to claim 1, a knock collar is provided between the engine and at least one of the engine support portion and the engine connecting portion.

  According to the first aspect of the present invention, the main frame includes a main frame that extends from the head pipe and supports the engine, and a pivot frame that is supported by the engine and to which a swing arm that swingably supports the rear wheel is attached. In a motorcycle in which the main frame and the pivot frame are separated from each other, the main frame has an engine support portion that supports the rear portion of the engine from the rear of the vehicle body, and the pivot frame is attached to the rear portion of the engine from the rear of the vehicle body. Therefore, the position accuracy of the main frame, the engine, and the swing arm can be improved, and thereby the engine can be increased in output and the power performance of the motorcycle can be improved.

  According to the second aspect of the present invention, since the knock collar is provided between the engine and at least one of the engine support portion and the engine connecting portion, the positional accuracy of the main frame, the engine, and the swing arm can be further improved. Thus, the power performance of the motorcycle can be further improved.

Hereinafter, an embodiment of a motorcycle according to the present invention will be described in detail with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
1 to 4 show an embodiment of the present invention. FIG. 1 is a partially cutaway side view for explaining a motorcycle according to the present invention. FIG. 2 is an enlarged view of a portion A in FIG. 3 is a partially cutaway rear view of the main frame, the engine, and the pivot frame as viewed from the rear in FIG. 2, and FIG. 4 is a schematic perspective view of the rear frame engine support portion and the engine connection portion of the pivot frame. . In the following description, front and rear, left and right, and top and bottom are indicated as Fr in the front, Rr in the rear, L in the left, R in the left, R in the right, U in the upper, and D in the lower according to the direction viewed from the driver.

  As shown in FIG. 1, a motorcycle 10 according to this embodiment includes a pair of left and right main frames 30 extending rearward and downward from a head pipe 11 and a pair of left and right front forks 12 that are rotatably supported by the head pipe 11. A front wheel 13 rotatably supported by the lower end portion of the front fork 12, a steering handle 14 attached to the upper end portion of the front fork 12, an engine 50 attached to the lower portion of the main frame 30, and an engine 50 A pair of left and right pivot frames 40 to be attached, a swing arm 15 that is swingably supported by the pivot frame 40, a rear wheel 16 that is rotatably supported by a rear end portion of the swing arm 15, and a pivot frame 40 and a swing A rear wheel suspension device 60 that pivotably connects the arm 15, and the main frame 30. A seat frame 17 connected to the rear portion and extending rearward, a rear frame 18 connected to the rear end portion of the main frame 30 and extending rearward, and connected to the seat frame 17 at the rear end portion, and attached to the upper portion of the main frame 30. A fuel tank 19 and a seat 20 attached to the upper part of the seat frame 17 are provided, and the main frame 30 and the pivot frame 40 are separated from each other. In the figure, 21 is a wind screen, 22 is an upper cowl, 23 is a side cowl, 24 is a lower cowl, 25 is a seat cowl, 26 is a front fender, and 27 is a rear fender.

  The engine 50 is a water-cooled in-line four-cylinder engine, and four exhaust pipes 52 are connected to each cylinder of the cylinder head 51 of the engine 50, respectively. These four exhaust pipes 52, 52... Extend downward from the cylinder head 51, gather and branch below the engine 50, and are paired with left and right mufflers 53 (see FIG. Then, only the muffler on the left side of the vehicle body is shown.) The muffler 53 is fixed below the rear frame 18 via a muffler stay 54. In FIG. 1, 55 is an oil pan for storing lubricating oil. For convenience of explanation, the four exhaust pipes 52, 52,... Are omitted in FIG.

  The rear wheel suspension device 60 has a cushion unit 62 swingably attached to a bracket 61 formed on the upper part of the swing arm 15, and a lower end portion of the cushion unit 62 is swingably connected to a lower end portion of the pivot frame 40. The cushion arm 63 is provided with a cushion connecting rod 64 that pivotably connects the intermediate portion of the cushion arm 63 and the lower intermediate portion of the swing arm 15.

  In the motorcycle 10 of the present embodiment, as shown in FIG. 1, the main frame 30 includes a rear engine support portion (engine support portion) 31 that supports the rear portion of the engine 50 by bolt fastening from the rear of the vehicle body, and the engine 50. Engine hangers 32a and 32b (four places in total on the left and right sides) for supporting the front side surface of the vehicle by bolt fastening from the side of the vehicle body. The engine 50 is attached to the main frame 30 by bolting the engine 50 to the rear engine support 31 and the engine hangers 32a and 32b. The engine hanger 32a is fastened at the front of an engine cylinder (not shown), and the engine hanger 32b is fastened at the rear of the engine cylinder.

  As shown in FIGS. 2 to 4, the rear engine support portion 31 is formed so as to connect the rear end portion of the main frame 30 in the front-rear direction. The rear engine support portion 31 includes a cross member 35 formed so as to connect the rear engine support portion 31 in the vehicle width direction. The rear portion of the engine 50 is connected to the rear engine support portion on the lower surface of the cross member 35. A pair of left and right engine stays 33 for fastening bolts to 31 are formed, and a pair of left and right frame brackets 34 for connecting the front end of the rear frame 18 are formed at the rear end of the cross member 35. An engine bracket 56 that is connected to the engine stay 33 of the rear engine support 31 is formed above the rear portion of the engine 50. Further, the engine stay 33 of the rear engine support 31 and the engine bracket 56 of the engine 50 are fastened by bolts 71 and nuts 72.

  2 and 3, the pivot frame 40 is a split-type pivot frame, and the swing arm 15 is swingably supported by a pivot shaft 46 fixed to the pivot frame 40 by a split bolt 45. Is done. A side stand stay 47 for attaching a side stand (not shown) is formed at the lower end of the pivot frame 40 on the left side of the vehicle body. In FIG. 3, reference numeral 48 denotes a pivot nut. The pivot nut 48 is fixed to the pivot frame 40 by split tightening with a split bolt 49.

  As shown in FIGS. 2 to 4, the pivot frame 40 includes an engine connecting portion 41 that is attached to the rear portion of the engine 50 by bolt fastening from the rear of the vehicle body. The pivot frame 40 is attached to the engine 50 by bolting the engine connecting portion 41 to the engine 50.

  The engine connecting portion 41 is formed so as to connect the lower end portion of the pivot frame 40 in the front-rear direction. The engine connecting portion 41 includes a cross member 42 formed so as to connect the pivot frame 40 in the vehicle width direction. The engine connecting portion 41 is bolted to the rear surface of the engine 50 on the lower surface of the cross member 42. A pair of left and right engine stays 43 for doing so and a pair of left and right cushion brackets 44 for connecting the cushion arms 63 of the rear wheel suspension device 60 are formed. A pair of left and right engine brackets 57 connected to the engine stay 43 of the engine connecting portion 41 are formed below the rear portion of the engine 50. Further, the engine stay 43 of the engine connecting portion 41 and the engine bracket 57 of the engine 50 are fastened by bolts 73 and nuts 74.

  Further, in the present embodiment, the engine 50 is connected between the rear engine support portion 31 of the main frame 30 and the engine connecting portion 41 of the pivot frame 40, that is, the engine bracket 56 of the engine 50 and the engine stay 33 of the rear engine support portion 31. The knock collar 70 is interposed between the engine bracket 57 of the engine 50 and the engine stay 43 of the engine connecting portion 41.

  The knock collar 70 is a substantially cylindrical member that is formed on the joint surface between the engine bracket 56 and the engine stay 43 and the concave fitting portions 75 and 75 formed on the joint surface between the engine bracket 56 and the engine stay 33. It is each fitted to the recessed fitting parts 76 and 76 formed, respectively. The recessed fitting portions 75 and 76 are formed at positions corresponding to bolt insertion holes (not shown) of the engine brackets 56 and 57 and the engine stays 33 and 43.

  As described above, according to the motorcycle 10 of the present embodiment, the main frame 30 that extends from the head pipe 11 and supports the engine 50, and is supported by the engine 50, and supports the rear wheel 16 in a swingable manner. In the motorcycle 10 including the pivot frame 40 to which the swing arm 15 is attached, and the main frame 30 and the pivot frame 40 are separated from each other, the main frame 30 supports the rear part of the engine 50 from the rear of the vehicle body. Since the pivot frame 40 includes the engine connecting portion 41 attached to the rear portion of the engine 50 from the rear of the vehicle body, the positional accuracy of the main frame 30, the engine 50, and the swing arm 15 can be improved. As a result, the output of the engine 50 is increased, and the movement of the motorcycle 10 is increased. It is possible to improve the performance.

  Further, according to the motorcycle 10 of the present embodiment, the knock collar 70 is interposed between the engine 50 and the rear engine support portion 31 of the main frame 30 and the engine connecting portion 40 of the pivot frame 40. Further, the positional accuracy of the engine 50 and the swing arm 15 can be further improved, whereby the power performance of the motorcycle 10 can be further improved.

1 is a partially cutaway side view for explaining a motorcycle according to the present invention. It is the A section enlarged view of FIG. FIG. 3 is a partially cutaway rear view of the main frame, engine, and pivot frame of FIG. 2 as viewed from the rear. It is a schematic perspective view of the rear-frame engine support part of a main frame and the engine connection part of a pivot frame.

DESCRIPTION OF SYMBOLS 10 Motorcycle 11 Head pipe 13 Front wheel 15 Swing arm 16 Rear wheel 30 Main frame 31 Rear engine support part (engine support part)
32a, 32b Engine hanger 33, 43 Engine stay 35 Cross member 40 Pivot frame 41 Engine connecting part 42 Cross member 50 Engine 51 Cylinder head 56, 57 Engine bracket 60 Rear wheel suspension device 70 Knock collar

Claims (2)

A main frame that extends from the head pipe and supports the engine; and a pivot frame that is supported by the engine and on which a swing arm that swingably supports a rear wheel is mounted. The main frame and the pivot frame are separated from each other. Motorcycles
The main frame has an engine support portion that supports a rear portion of the engine from the rear of the vehicle body,
2. The motorcycle according to claim 1, wherein the pivot frame has an engine connecting portion attached to a rear portion of the engine from a rear side of the vehicle body. The motorcycle according to claim 1, wherein a knock collar is provided between the engine and at least one of the engine support part and the engine connection part.

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