JPS5865936A - Motorcycle engine - 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 The present invention relates to an arrangement structure for an engine of a motorcycle, etc., in which a transmission and auxiliary machinery for a motorcycle are arranged in a compact manner.

Especially for motorcycles, it is desirable to make maximum use of the limited frame space and arrange equipment as compactly as possible. FIG. 1 is a schematic right side view of an engine in a conventional general motorcycle, and FIG. 2 is a schematic plan view of the same. This drive system includes a crankshaft 2 of an engine 1,
a main shaft 4 equipped with a multi-stage transmission gear driven from the crankshaft 2 via a clutch 3;
'F Tri A where the speed change gear of this main shaft and the counter shaft 5 having the gear train 1 are almost horizontal.
The countershaft 5i1'? - is attached with a sprocket and drives the rear wheel by a chain, or by a bevel gear to drive a propeller shaft 6 in the right angle direction as shown in the figure to transmit power to the rear wheel. A generator 7 and a starting motor 8 are further installed in the drive system, but in a motorcycle, the entire engine section is kept as narrow as possible, and the bank angle when driving around curves is made to have a margin, and the footwells are kept small. To save space, the generator 11 is not installed on the same axis as the crankshaft 2, and the engine]
7a of the generator 7 and the crankshaft 2 are connected to the sprocket ga, ga and the chain 9.
They are connected by b. Here, in the space on the right side of the generator 7, there is a case housing a clutch 3 having a large diameter with respect to a substantially plane B connecting the tops of the cases of the main shaft 4 and the countershaft 5 on which the generator 7 is placed. Since the upper part of the starter motor 8 protrudes, there is a narrow gap with the carburetor 12.The starting motor 8 is placed behind the generator 7 to avoid this. The gear 7b of the generator 7 is driven to reduce speed through the gear 7b, and the shaft 7a of the generator 7 is driven via a one-way clutch interposed between the gear 7b and the shaft 7a of the generator 7. Therefore, when starting the engine 1, the starting motor 8 is started, and the generator 7a is rotated via the idling gear 9.
Furthermore, sprocket) 9 a + 9 a and chain 9 b
When the crankshaft 2 is rotated via the crankshaft 2 and the engine 1 is started, the one-way clutch acts to cut off the rotation from the engine 1 side to the starting motor 8. On the other hand, the generator 7 receives the rotation of the crankshaft 2 It is driven and generates electricity.

Compared to the above-mentioned publicly known engine starting device structure for motorcycles, motorcycles are required to be more compact.
First, regarding downsizing mainframe 1o,
In the above arrangement in which the starting motor 8 is disposed behind the generator 7, the left mounting hanger 11a of the engine 1 mounting hangers 11a and 11b is obstructed by the starting motor 8, making installation difficult. In addition, it is desired that the engine 1 be shortened not only in the left and right parts 11 but also in the front-to-back length t in line with the above-mentioned direction of compactness.

The present invention aims to make motorcycles more compact, and the main shafts of the drive system were conventionally arranged in parallel on a plane formed by the crankshaft and the countershaft. It is arranged below the plane formed by the crankshaft and the countershaft, so that the plane connecting the tops of the cases of the clutch, the main shaft, and the countershaft form approximately one plane;
By arranging a generator and a starting motor to face each other on the plane and parallel to the crankshaft, a space for mounting hangers on the left and right sides of the engine is secured, and the front-rear length of the engine is shortened. It provides an engine for

The present invention will be described below with reference to FIGS. 3 and 4 showing one embodiment. Fig. 3 shows a schematic right side view of the engine of the present motorcycle, and Fig. 4 shows a schematic plan view thereof. A main shaft 4' is disposed above the plane A' and is equipped with a multi-stage transmission gear driven from the crankshaft 2' via a clutch 3', and is disposed below the plane A'. In this way, at the rear of the engine 1', the surfaces connecting the tops of the cases of the clutch 3', main shaft 4', and countershaft 5' form approximately one plane B'. The generator 7' is placed on the plane B' on the rear left side of the conventional engine 1' in parallel with the crankshaft 2'. On this one plane B', by moving the main shaft 4' downward, the protrusion of the upper part of the case housing the large-diameter clutch 3' is eliminated, and the gap with the capretor 12' is wide, so the starting motor 8 ' can be mounted opposite to the right side of the generator 7'. In this arrangement, the shaft 78' of the generator 7' and the crankshaft 2' are connected by transmission means such as sprockets ga', ga' and a chain 9b', and the starting motor 8' and the generator 7' are The gear 7b of the generator 7' is connected to the gear 7b of the generator 7' via the shear link gear 9' to the binion Bb' attached to the starting motor 8a'.
7a' of the generator 7' through a one-way clutch interposed between the gear 7b' and the shaft 7a' of the generator 7'. ing.

The operation of the starting system in the engine of the present invention having the above-mentioned structure is completely the same as that of the conventional engine, so a description thereof will be omitted.

As described above, in the present invention, the main shaft 4' is disposed below the plane formed by the crankshaft 2' and the countershaft 5'. − part case B'
Since the gap between the engine 1' and the capretor 12' is widened, the generator 7' and the starting motor 8' can be installed parallel to and facing the crankshaft 2'. Starting motor 8' for both left and right
The main frame 10' can be mounted over a wide span at an ideal position in terms of rigidity without being obstructed by the main frame 10', making it possible to make the main frame 10' more compact and rigid. Furthermore, by arranging the generator 7' and the starting motor 8' on the left and right sides, the left-right weight balance of the engine of a vehicle, such as a two-wheeled vehicle, can be improved as much as possible, as shown in the table below.

Furthermore, the distances 2', 4' between the crankshaft 2' and the main shaft 4' and the distances 4', 5' between the main shaft 4' and the countershaft 5' are the same distances 2', -< as in the conventional engine 1. -4', 6- are equal, the longitudinal length 7' of this engine is shorter than the longitudinal length t of the conventional engine, and as a result, the rear axle pivot of the vehicle is moved forward, and the rear fork length can be increased. In addition, the center of gravity of the vehicle is moved forward, which has the effect of improving the left-right weight balance of the front IIi engine and improving ride comfort.

[Brief explanation of the drawing]

Fig. 1 is a schematic right side view of a conventional general motorcycle engine, Fig. 2 is a schematic diagram of the same, Figs. A schematic plan view of the engine of a two-wheeled vehicle is shown in the right side 1111 mark i and FIG. 4. 1.1'...Engine, 2.2'...Crankshaft, 3.3'...Clutch, 4, 4'...Main shaft, 5°5'...Countershaft, 7.
7'... Generator, R, 8'... Starting motor, 1.0
...Mainframe, lla. 11b... Mounted hanger. Written amendment (voluntary) January 1981 711 Commissioner of the Patent Office Kazuo Wakasugi 2 Name of the invention Motorcycle engine 3 Representative of the person making the amendment Yoshiyoshi Kawashima 4 Name of agent Patent attorney (8188) ) Toshihiko Watanabe6
, Contents of correction (1) The correction is made to [large diameter clutch 3 &"kr large diameter primary reduction driven gear and clutch 3" on page 3, line 6, line 11 to line 7 of the specification. (2) Replace [generator 7' in page 6, line 11, 1] with [J for one-way crudges.

Claims (1)

[Claims] 1. A transmission device consisting of an engine crankshaft, a main shaft equipped with a multi-stage transmission gear driven from the crankshaft via a clutch, and a countershaft having a gear train that meshes with the transmission gear of the main shaft. In the motorcycle engine, the uppermost surface of the case housing the transmission is formed into a substantially flat surface,
A motorcycle, characterized in that a generator and a starting motor are provided on the plane facing each other and parallel to the crankshaft, and the generator and the starting motor and the generator and the crankshaft are connected by a transmission means. engine.