JPS62155191A - Power transmission gear for motorcycle, etc. - 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 (Field of Industrial Application) The present invention relates to a power transmission device for a motorcycle or the like having a toroidal continuously variable transmission in its power transmission system.

(Prior Art) For example, some power transmission devices such as motorcycles use a continuously variable transmission to change the speed of the power of an internal combustion engine and transmit this power to the drive system. This makes it possible to drive efficiently and is effective in improving fuel efficiency.

As such a continuously variable transmission, for example, JP-A-58-1
There is a toroidal continuously variable transmission as disclosed in Japanese Patent No. 60664, and this continuously variable transmission has advantages such as being durable, compact, and having a wide speed range.

(Problem to be Solved by the Invention) It is advantageous for assembly to arrange such a toroidal type continuously variable transmission on one end side of the crankshaft of an internal combustion engine. Since it is connected to the engine's crankshaft, it is easily affected by the heat of the internal combustion engine.

Furthermore, in recent years, there has been a tendency for various devices to be arranged around internal combustion engines, making it difficult to secure space for arrangement, and it is also necessary to take maintainability into consideration when arranging them.

This invention was made against the background of this situation.
The object of the present invention is to provide a power transmission device for a motorcycle, etc., which improves the cooling performance and maintainability of a toroidal continuously variable transmission.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention changes the power obtained by an internal combustion engine to a predetermined gear ratio with a toroidal continuously variable transmission, and drives this power. In a power transmission device for a motorcycle or the like that transmits power to the system, a storage toroidal continuously variable transmission is arranged on the insect body side and connected to the crankshaft of the internal combustion engine,
It is characterized by having the power extraction mechanism of this toroidal continuously variable transmission mounted on the rear side of the vehicle body.

(Created by Tl) In this invention, a toroidal continuously variable transmission is placed on the rear side of the vehicle body, and the power changed by the toroidal continuously variable transmission is outputted from a power extraction mechanism placed on the rear side of the vehicle body. Ru.

Since the toroidal continuously variable transmission is disposed at the front of the turret, it is efficiently cooled by airflow from the vehicle. Furthermore, since a relatively wide space is secured between the front side of the internal combustion engine and the heavy wheels, maintenance of the toroidal continuously variable transmission can be easily performed from the front side.

(Example 1) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a motorcycle, and a body frame 2 of this motorcycle 1 has an n1 wheel 3 and a rear wheel 4 suspended thereon. An internal combustion engine 5 is mounted vertically in the center of the vehicle body frame 2, and a four-stroke internal combustion engine is used as the internal combustion engine 5.

In an engine case 6 of the internal combustion engine 5, a crankshaft 8 driven by a piston 7 is rotatably supported by a bearing portion 9 thereof. The crankshaft 8 is arranged parallel to the traveling direction of the vehicle, and a generator 10 is provided at the rear end of the vehicle body, and a toroidal continuously variable transmission is connected to the other end in front of the heavy body via a centrifugal clutch 11. 12 are connected. The toroidal continuously variable transmission 12 has a housing 13 attached to the engine case 6, and an input shaft 414 is rotatably supported by the housing 3 and the engine case 6, respectively.

A cam plate 15 is integrally rotatably disposed on this human power shaft 14, and power is transmitted to an input disk 18 via rollers 17 supported by a retainer 16. input disk 18
is loosely coupled to the input shaft 14, and the output disk 19 is disposed opposite to the input disk 18. Opposing rotating curved surfaces 18a, 1 of input disk 18 and output disk 19
A power roller 20 is disposed between the rollers 9a. Power from the input disk 18 is transmitted to the output disk 19 via this power roller 20.

The power rollers 20 are each rotatably provided on a roller shaft 21, and the roller shaft 21 is rotatably supported on a trunnion 22.

The trunnion 22 is disposed in a direction perpendicular to the roller shaft 21, and when moved a small amount in the axial direction by an actuating mechanism (not shown), a well-known automatic speed change effect occurs and a desired speed change ratio can be obtained.

The output gear 23 formed on the shaft of the output disk 19 is
It meshes with a gear 26 of a connecting shaft 25 that constitutes a secondary transmission 24. A gear 2 provided at the other end of this connecting shaft 25
7 meshes with the gear 29 of the output shaft 28, and a drive shaft 31 is provided at the end of the output shaft 28 protruding from the engine case 6 via a universal joint 30, which is a power extraction mechanism. Power is extracted from the rear of the vehicle.

A rear end portion of this drive shaft 31 is engaged with a bevel gear 34 of a drive shaft 33 rotatably supported by an axle 32 . The rotation of this drive fI[1I33 causes the rear wheel 4 to
are designed to rotate together.

A mission chamber 35 in which the secondary transmission 24 is placed and a crank chamber 36 in which the crank 0118 is placed communicate with each other to form one room, and this room is supplied with engine oil for lubricating each part.

When this engine oil is affected by heat due to the drive of the internal combustion engine 5, its viscosity decreases and the coefficient of friction increases, which is one of the causes of increased loss in the internal combustion engine 5. Therefore, the crank chamber 36 and the transmission chamber 35 are communicated with each other to improve the heat dissipation of the crank chamber 36 and to reduce the rise in the temperature of the engine oil.

Further, the transmission chamber 37 of the toroidal continuously variable transmission 12
The engine case 6 serves as a partition wall, and the crank chamber 36
and the mission room 35. Traction oil is supplied to this transmission chamber 37, and this traction oil, for example, is used as shown in Japanese Patent Publication No. 46-339, and has a high traction coefficient, high oil shear resistance, Moreover, it has excellent stability against heat.

Next, the operation of this embodiment will be explained.

As the heavy vehicle travels, heat is transferred to the toroidal continuously variable transmission 12 from the crank chamber 36, but the traveling air comes into contact with the housing 13 of the toroidal continuously variable transmission 12 located in front of the internal combustion engine 5. .

As a result, the lubricating oil of the toroidal continuously variable transmission 12 is cooled, temperature rise can be further reduced, and the speed change operation can be performed reliably.

Further, since a relatively wide space is secured between the front side of the internal combustion engine 5 and the front wheels 3, maintenance of the toroidal continuously variable transmission 12 can be easily performed from the front side.

In addition, although the above embodiment described the motorcycle +1,
The same can be applied to an automatic three-wheeled vehicle +lj.

(Effects of the Invention) As described above, this invention has a toroidal continuously variable transmission disposed on the front side of the vehicle body, and the power take-off mechanism 4 of the toroidal continuously variable transmission is provided on the rear side of the vehicle body. is efficiently cooled by hitting the toroidal continuously variable transmission. moreover,
Since a relatively wide space is secured between the front side of the internal combustion engine and the front wheels, maintenance of the toroidal continuously variable transmission can be easily performed from the front side, improving maintainability.

[Brief explanation of drawings]

Figure 1 is a side view of a motorcycle to which this invention is applied;
The figure is a sectional view of the power transmission device of the present invention. 5... Internal combustion engine 6 - Engine case 8... Crankshaft 12... Toroidal continuously variable transmission 24... Secondary transmission 30... Universal joint patent Applicant Yamaha Motor Co., Ltd. Indication of 1985 No. 1 Jl 30L+ 1'114 No. 1 filed by L Tsuki Co., Ltd. Patent Application No. 294869 2 Title of the invention Power transmission device for motorcycles, etc. 3 Relationship with the case of the person making the amendment Patent applicant Address: 2500 Shingai, Kaida City, Shizuoka Prefecture Name (807) Yamaha Motor Co., Ltd. 4 Agent address: 1
51 Address New State Mena-1043, 2-23-1 Yoyogi, Shibuya-ku, Tokyo Phone 0:+ (375):174
No. 0 (1) Figure 2 of the attached drawings is corrected as shown in the attached sheet. that's all

Claims (1)

[Claims] In a power transmission device such as a motorcycle that changes the power obtained by an internal combustion engine to a predetermined gear ratio using a toroidal continuously variable transmission and transmits this power to the drive system, the toroidal continuously variable transmission is mounted on the front side of the vehicle body. A power transmission device for a motorcycle, etc., which is arranged in connection with the crankshaft of an internal combustion engine, and has a power extraction mechanism for this toroidal continuously variable transmission on the rear side of the vehicle body.