JPH0547034Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an engine support structure in a motorcycle or the like.

[Prior Art] As a support method for an engine in a motorcycle or the like, for example, there is a type in which a pair of left and right main frames extending rearward from a head pipe is provided, and the engine is supported by the main frames. In this case, the cylinder portion is generally supported by an engine hanger extending from the main frame.

[Problems to be Solved by the Invention] Incidentally, in the case of the above structure, it is necessary to arrange the engine hanger extending downward from the main frame so as not to interfere with the intake system components of the engine.

In addition, it is desirable to improve the torsional rigidity of vehicle body components such as the main frame in the left and right directions.
For this purpose, the engine is supported via an engine hanger, and the two hypotenuses are the parts in front of the main frame that expand left and right with the head pipe as the apex and extend rearward, and the engine hanger is used between the left and right main frames. It is conceivable that the rigidity can be increased by forming a truss structure having a substantially triangular shape in plan view with the engine connected via the truss structure as the base.
However, since the engine hanger generally extends downward diagonally from the main frame to the rear, the connection between the engine hanger and the main frame is located relatively close to the head pipe, making the truss structure relatively small. In order to sufficiently improve the rigidity, it is desirable to make this truss structure even larger.

Moreover, in order to support the engine more firmly, it is desirable to be able to support the front and rear of the vibration source.

The present invention aims to solve such problems.

[Means for Solving the Problems] The engine support structure of the present invention is a two-wheeled motor vehicle in which an engine equipped with a cylinder portion and a crankcase is supported by a body frame, and the engine support structure has a substantially straight line and A main frame extending in a pair of left and right sides surrounds at least a portion of the engine and the intake system components of the engine, and is formed integrally with the main frame and extends diagonally forward and downward from the rear of the cylinder portion to both sides of the cylinder portion. A pair of left and right hanging engine hangers are provided, and the front and rear portions of both sides of the cylinder portion are respectively supported via the engine hangers, and a pair of left and right down frames that are bent downward are provided at the rear of the main frame. , the rear part of the engine crankcase is supported by this down frame, the cylinder part is extended upward to the front part of the crankcase, and the intake system parts are placed behind the cylinder part.
It is characterized by the arrangement of exhaust system parts at the front.

[Operation of the invention] At the front of the vehicle body frame, the engine hanger supports the side surface of the cylinder part, and at the rear, the down frame side supports the rear part of the crankcase.
At this time, the left and right pair of rearwardly tilted engine hangers hang from the main frame to both sides of the cylinder unit and hang diagonally forward and downward from the rear of the cylinder unit, so they face the space formed between the left and right main frames. It will not interfere with the intake system parts of the engine, which are arranged as follows.

Moreover, the front side of the main frame has two hypotenuses that expand left and right with the head pipe as the apex and extends rearward, and the engine that connects the left and right main frames via the engine hanger is the base when viewed from above. A triangular truss structure is formed.

Furthermore, since the engine hanger is tilted backwards and is integrated with the main frame at a location far from the head pipe, the truss structure becomes larger. Further, on the rear side of the main frame, the rear part of the engine crankcase is supported by a pair of left and right down frames. Therefore, the torsional rigidity of the vehicle body in the left-right direction is improved, and the overall rigidity is increased.

Furthermore, the cylinder part is extended upward from the front part of the crankcase, and the intake system parts are placed at the rear of the cylinder part, and the exhaust system parts are placed at the front. Since the front and rear parts are supported separately, the front and rear parts of the engine vibration source are supported, making the support stronger.

[Example] Fig. 1 shows the overall structure of a two-wheeled motor vehicle to which the present invention is applied. First, a pair of left and right main frames 1 are installed in parallel in the longitudinal direction of the vehicle body (only the left side in the direction of travel is visible in the figure). This front end is connected to the head pipe 2. A handle 3 is rotatably supported on the head pipe 2, and a front wheel 5 is supported at the tip of a front fork 4 connected to the handle 3. In addition, the main frame 1 extends rearward from the head pipe 2 in a straight line diagonally downward as seen from the side, and at its rear end is provided with a pair of left and right down frames 6 that bend downward, and a swing arm with one end pivotally connected to this. 7 extends to the rear. A rear wheel 8 is supported at the rear end of the swing arm 7.

Furthermore, engine hangers 9 and 10 are integrally provided on the front sides of the left and right main frames 1, respectively. Of these, the engine hanger 10 hangs diagonally forward and downward from the rear of the cylinder section, and corresponds to the rearwardly inclined engine hanger of the present invention, which supports both side surfaces of the cylinder section. These engine hangers 9 and 10 are provided as a pair on the left and right, respectively, and are provided so as to hang down so that their tips converge. At the joint portion 11 where the tips of both are connected, the engine hangers 9 and 10 are attached to both left and right sides of the front part of the engine 12. is supported.

Furthermore, both rear left and right sides of the engine 12 are supported by a pair of left and right down frames 6 at two locations, an upper portion 13 and a lower portion 14. The main frame 1, down frame 6, and engine hangers 9 and 10 constitute the vehicle body frame of the present application.

Further, a radiator 15 is disposed in front of the engine 12, and the engine 12 is cooled by this. An air cleaner 16 for supplying clean air to the engine 12 is disposed behind the engine 12. The air cleaner 16 is supported by the vehicle body frame, takes in outside air through a duct 17, filters it, and sends the purified air to the engine 12 through a carburetor 18. A fuel tank 19 is provided above the air cleaner 16 and supported on the main frame 1. Air cleaner 16, duct 17 and carburetor 18
is the intake system part of the engine in this invention,
A part of the duct 17 and a part of the suction pipe connecting the carburetor 18 to the cylinder head (described later) face into the space formed by the left and right main frames 1 together with the upper part of the cylinder head, and are surrounded by the left and right main frames 1. It is.

FIG. 2 is an enlarged view of the engine hanger 9, 10 portion. The engine 12 consists of a cylinder 20, a cylinder head 21 provided above the cylinder head 21, and a crankcase 22 provided below. The cylinder 20 and cylinder head 21 form the cylinder portion of the present invention.

The cylinder 20 and the cylinder head 21 are connected by stud bolts 23 planted at each corner of the cylinder 20, with a gasket 24 interposed between them. An engine hanger 10 is disposed on the side surface of the cylinder 20 so as to be diagonal to the axis L of the engine 12. Particularly in this embodiment, the cylinder 20 and the cylinder head 2
It is provided on the side surface of the cylinder portion consisting of 1 and substantially on a diagonal line thereof. A cylinder head side mount portion 25 is provided between the engine hanger 10 and the cylinder head 21.

Further, at the joint portion 11 that is integrated with the engine hanger 9 at the distal end of the engine hanger 10, the crankcase side mount portion 26 is provided as described above. These mount parts 25 and 26 are both connected by a known mounting means such as a bolt via a damper rubber or the like. Furthermore, in this embodiment, a cylinder side mount portion 2 is also provided between the cylinder 20 and the crankcase 22.
7 is provided and connected between the two.

Incidentally, as described above, mounting portions for connecting to the left and right down frames 6 are provided at the upper portion 13 and the lower portion 14 on both left and right side surfaces of the rear portion of the crankcase 22 (FIG. 1).

As described above, in this embodiment, by making the left and right main frames 1 linear in side view, some of the intake system parts such as the cylinder head 21 and the duct 17 can be moved into the space surrounded by these main frames. I'm making it happen. Furthermore, since both sides of the cylinder head 21 are supported by the engine hanger 10 which is disposed obliquely to both sides of the cylinder head 21, the engine hanger can be disposed without interfering with suction system components.

Further, when the front side of the engine 12 is supported by the engine hangers 9 and 10, strong support can be obtained because the engine hangers 9 and 10 are integrated with the main frame 1 and form a truss structure when viewed from the side. Moreover, the front side of the main frame 1 has two hypotenuses that expand left and right with the head pipe 2 at the apex and extend rearward, and the engine connects these left and right main frames 1 via engine hangers 9 and 10. A truss structure having a substantially triangular shape in plan view is formed with the 12 cylinder portions as the base. Moreover, since the engine hanger 10 is tilted backward and is integrated with the main frame 1 at a position apart from the head pipe 2, the truss structure becomes large, and the torsional rigidity of this part becomes large. Furthermore, on the rear side of main frame 1,
The rear part of the crankcase 22 of the engine 12 is supported by a pair of left and right down frames 6. Therefore, the torsional rigidity of the entire vehicle body in the left and right direction is improved.

Further, while the engine is operating, intermittent forces are applied between the cylinder 20 and the cylinder head 21 due to explosive combustion. Therefore, a large force is intermittently applied in a direction that relatively separates the cylinder 20 and cylinder head 21 from each other. However, the cylinder portion is strongly fixed at a cylinder head side mount portion 25 and a crankcase side mount portion 26 by an engine hanger 10 that connects the cylinder head 21 and crankcase 22 obliquely. Therefore, cylinder 20 and cylinder head 21
Intermittent large forces acting during this period are dispersed to the engine hanger 10. Therefore, the stress applied to the stud bolt 23 is equalized, and the gasket 2
Fatigue in the four parts can also be reduced.

Further, the cylinder 20 is extended upward from the front part of the crankcase 22, and the intake system parts 16, 17, 18, etc. are arranged at the rear of the cylinder 20, and the exhaust system parts such as an exhaust pipe are arranged at the front, and the cylinder 20 is tilted backward. Since the engine hanger 10 supports the front and rear parts of both sides of the cylinder 20 by the cylinder head side mount part 25 and cylinder side mount part 27, respectively, the front and rear parts of the vibration source of the engine 12 are supported. becomes strong.

Moreover, in this embodiment, the engine hanger 1
0 is disposed diagonally to the side surface of the cylinder portion, making it easy to equalize the stress applied to each stud bolt 23. Furthermore, since the cylinder 20 and the engine hanger 10 are connected by the cylinder side mount portion 27, even stronger and more reliable support is possible.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications and applications are possible. For example, it goes without saying that the cylinder portion of the engine and the crankcase may be integrally formed.

[Effects of the invention] The engine support structure according to the invention surrounds the engine and at least a portion of the intake system parts of the engine by a main frame that extends rearward from the head pipe substantially linearly in a pair of left and right sides when viewed from the side. A pair of left and right engine hangers hanging down from both sides of the cylinder part were provided integrally with the frame, and both sides of the cylinder part were supported via the engine hangers, so that at least a portion of each of the engine and its intake system parts was supported. Interference between the intake system parts and the engine hanger can be avoided even when facing into the space surrounded by a pair of main frames.

Furthermore, the cylinder part is extended upward from the front part of the crankcase, and the intake system parts are placed at the rear of the cylinder part, and the exhaust system parts are placed at the front. Since the front and rear parts are supported separately, the front and rear parts of the engine vibration source are supported, making the support stronger.

Furthermore, the engine hanger integrated with the main frame can firmly support the engine to the main frame, and on the front side of the main frame, the left and right main frames and the engine are connected to the engine hanger, which is approximately 3 mm in plan view.
A rectangular truss structure can be formed, and since the rear-slanted engine hanger is integrated with the main frame at a position far from the head pipe, this truss structure becomes larger. Furthermore, since the rear of the engine crankcase is supported by a pair of left and right down frames on the rear side of the main frame, it is possible to improve the torsional rigidity of the vehicle body in the left and right direction, and as a result, the overall rigidity is increased.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a side view showing the internal structure of a two-wheeled motor vehicle, and FIG. 2 being a side view of the main parts. Explanation of symbols, 1... Mainframe, 9, 10
...Engine hanger, 12...Engine, 20...
...Cylinder, 21...Cylinder head, 22...
Crankcase, 23... Stud bolt, 24
...Gasket, 25...Cylinder head side mount, 26...Crankcase side mount.

Claims (1)

[Scope of utility model registration request] In a two-wheeled motor vehicle in which an engine with a cylinder part and a crankcase is supported by a body frame,
A main frame that extends rearward from the head pipe in a substantially straight line in a pair of left and right sides surrounds the engine and at least a portion of the intake system parts of the engine, and is formed integrally with the main frame and diagonally extends from the rear of the cylinder portion. A pair of rearwardly inclined engine hangers are provided on the left and right that hang down from both sides of the cylinder part in a downward direction, and the front and rear parts of both sides of the cylinder part are respectively supported through the engine hangers. A pair of left and right down frames that bend downward are provided,
The down frame supports the rear part of the engine crankcase, and the cylinder part extends upward to the front part of the crankcase, with intake system parts placed at the rear of the cylinder part and exhaust system parts placed at the front. An engine support structure for a two-wheeled motor vehicle.