JPS60189685A - Supporter for engine of motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an engine support device for a motorcycle that is designed to improve maintainability.

[Technical background of the invention and its problems]

Engines installed in motorcycles have recently tended to become larger, and water-cooled multi-cylinder engines are also being used.

As the engine becomes larger, the space in the frame must be fully utilized. Particularly in the case of a water-cooled engine, the number of parts such as a radiator and cooling water piping increases, so the space in the frame becomes increasingly full. This causes problems when servicing the engine, such as making it difficult to reach with hands or tools, and making it impossible to insert and remove parts.

For example, in water-cooled parallel four-cylinder engines with horizontal crankshafts, the width of the cylinders and crankcases is large, so they get close to the downtube, and the downtube gets in the way when opening the cylinder head for maintenance. becomes an obstacle. To avoid this problem, make the left and right down tubes wider.

This is not preferable because the width of the tap increases.

Therefore, the engine is removed from the frame and maintained separately from the motorcycle. However, when removing the engine, the rear wheel drive system, intake and exhaust system, fuel system, electrical system, and cooling system must be removed. It is extremely troublesome as it has to be separated.

Moreover, as shown in Japanese Patent Application Laid-Open No. 58-49580,
If the down tube is attached and detached in order to attach and detach the ennon, the work efficiency is significantly reduced because the down tube attachment and detachment work is added to the above-mentioned troublesome work.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an engine support device for a motorcycle that allows maintenance to be performed without removing the engine from the frame.

[Summary of the invention]

In order to achieve the above object, the present invention supports an engine with a down tube and a frame excluding this down tube, and also makes the down tube removable from the frame and engine, so that when the down tube is removed, It is characterized in that the engine is supported by the frame.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings.

The illustrated motorcycle has a head pipe 1, a pair of left and right main frames 2.2f, and a down tube member 3,
Join the front ends of 3 and attach the main frame 2, 2 above.
The rear end of is joined to the bracket 4°4. The main frame 2+21rJ extends from the head pipe 1 toward the brackets 4, 4 in a substantially straight line in a side view, and extends from the head pipe 1 to the brackets 4, 4,
However, in plan view, the intermediate portions form curved portions 2a, 2a that bulge outward. Downtube member 3,
3 and the brackets 4, 4, down tubes 5, 5, which have an abbreviated shape when viewed from the side, are removably connected as will be described later. Furthermore, 6 is Down Tube Men/?
3, a cross member is placed between 3, and 7 is a tension pipe installed between the head pipe 1 and the main frames 2, 2.

A front fork 8 is pivotally supported on the head pipe 1, and a front wheel 9 is attached to the lower end of the front fork 8, and a steering handle 1o is attached to the upper end.

The bracket 4.4 is provided with a bivit 11, and this pin? The front end of a rear arm 12 is swingably supported on the seat 1. A rear wheel 13 is pivotally supported at the rear end of the rear arm 12.

A seat rail 14.degree. 14 is joined to the main frame 2.2, and a midway portion of this seat rail 14.degree. 14 is joined to a backstay 15 extending from the brackets 4,4. A seat 16 is mounted on this seat rail 14.14.

An engine 17 is provided in a space quadrupled by the main frames 2, 2 and down tubes 5, 5. The engine 17 is a water-cooled parallel four-cylinder engine with a horizontal crankshaft, and a transmission case 18 that also serves as a crankcase extends in the front-rear direction, and cylinders 19 . . . rise from the front end of the transmission case 18. Each cylinder 19A is the first
As shown in the figure, it is located below the main frames 2, 2,
The cylinder axis is tilted forward so as to be substantially parallel to the main frame 2°2.

Such an engine 17 is rubber-mounted on the upper part of the bracket 4 at the upper rear end of the mission case 18 via a built-in 20 and a com shock absorber (not shown), and the lower rear end of the mission case 18 is mounted on the upper part of the bracket 4. It is rubber mounted to the lower part of the bracket 4 via a gel 2 and a rubber buffer (not shown).

Oh, the front end of the mission case 18 has a Gert 22L.
- A support plate 23 is fixedly installed via a rubber buffer (not shown), and this support plate 23 is removably attached to the cedar run tube 5 by bolts 24 and 24. Furthermore, the lower front end of the transmission case 18 is detachably attached to a gusset 26 provided on the siding tube 5 through a bolt 25.

Therefore, the engine 17 is the Gerd 20.

2 is supported by the bracket 4, and
It is supported on the down tube 5 via 22.25.

A fuel tank 27 is arranged above the mission case 18, and a carburetor 28 is arranged in front of the fuel tank 27.
...is provided. Each carburetor 28 is located directly above the cylinder J9, is provided above the cylinder J9, and is juxtaposed in the width direction of the vehicle body. Each of these carburetors 28 is a curved portion 2a of the main frame 2.2.

2a.

An air cleaner 29 is installed above each vaporizer 28, and the air cleaner 29 communicates with each vaporizer 28.

A cover 30 is provided between the head gib 1 and the seat 16, and this cover 30 covers the top and side surfaces of the fuel tank 27 and air cleaner 29.

The down tube 5.5 has joints 31 and 32 joined to its front and rear ends, respectively, and joints 33 and 34 are also joined to the rear end of the down tube member 3 and the lower front end of the placket 4. . These joints 31, 33, 32, and 34 are removably connected by builds 35, . . . . The down tubes 5, 5 are detachably attached to the frame except for the down tube 5.5.

The operation of the embodiment having such a configuration will be explained.

When servicing the engine 17, at least one of the left and right down tubes 5, 5 is removed. Downtube 5.5 is each joint, ? 1. 92 is bolt 3
5... are connected to the soyoites ss and 34 on the frame side, so when these builds 35... are removed, they are released from the frame. Also, bolts 24, 24.2
By removing the down tubes 5, 5, the down tubes 5, 5 are also released from the engine J7. At this time, since the engine 17 is supported by the bracket 4, that is, the frame excluding the down tubes 5, 5, by the pills 1-20 and 21, there is no risk that the engine 17 will be removed. In other words, since the engine 17 remains supported by the frame, there is no need to remove the chain 36 for driving the rear wheels 13, the intake passage connecting the carburetor 28 and the cylinder J9, the exhaust pipe 37, etc.

By removing the down tubes 5, 5, the sides of the cylinder 7, especially the cylinder 19 and the cylinder head 36, are opened, making it easier to attach and detach the cylinder 36 and improve the rowing efficiency. do.

As mentioned above, the down tubes 5.5 can be removed during maintenance work, so if the down tubes 5.5 are attached to the frame, the down tubes 5.5 can be removed as shown in Figure 4. As shown, it can be installed close to the cylinder 19. This means that although the width of the ennon is narrower in a parallel multi-cylinder engine with a horizontal crankshaft, the down tubes 5, 5 can be placed close to the cylinder 19Vc, so the width of the car body can be reduced. The width of the knee grip can also be reduced without increasing the width.

Note that the present invention is not limited to the main frames 2, 2 having a straight shape when viewed from the side, but may have a curved shape such as one composed of a tank rail and a seat villa tube.

The engine is not limited to water-cooled parallel multi-cylinder engines with horizontal crankshafts, but in short, it can be carried out when the down tubes 5, 5 are close to the side or front of the engine and become an obstacle to maintenance. It is.

〔Effect of the invention〕

According to the present invention as described above, since it is possible to remove only the down tube while leaving the engine on the frame, there is no need to attach or detach the engine and each member on the frame side connected to it. Improved workability and downch.

- Since the down tube is removed from near the engine, the down tube does not get in the way of maintenance work, it is easy to insert hands and tools, and maintenance parts can be easily attached and detached, improving maintainability.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially sectional side view of a motorcycle, FIG. 2 is a plan view of a frame, and FIG.
The figure is a side view of the frame, and FIG. 4 is a front view of the frame. 1...Head pipe, 2...Main frame, 3...
Downtube member, 4...Bracket, 5...
Downtube, 17...Engine, 20.21...
・Gerd, 22.24...Bolt, 25...day? Luto.

Claims (1)

[Claims] The engine is supported by a down tube and a frame excluding this down tube, and the down tube is made removable from the frame and engine, so that when the down tube is removed, the engine moves from the frame to the frame. A motorcycle engine support device characterized by being supported.