JPH0229029Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a transmission device for a two-wheeled motor vehicle equipped with a unit swing type engine.

(Prior Art) Two-wheeled motor vehicles often use a unit swing type engine in which the engine and rear wheel are combined into a unit and suspended on the vehicle body for shock absorption. In this case, the unit case functions as a swing arm for suspension of the rear wheel, and as a transmission case that houses the transmission system inside. As a method of conduction, Japanese Patent Application Laid-Open No. 58-73492
As stated in the publication, since the unit case is long and narrow, a chain or belt transmission mechanism is suitable, and this is used as the primary transmission, and the gear transmission mechanism housed in the rear is used as the secondary transmission to drive the rear wheel drive shaft. is normal. However, the gear transmission mechanism is at least 2
It is necessary to install a shaft, which increases the size of the gear room and increases the weight of the rear part of the unit case, which is far from the swing center, which affects running performance and restricts the degree of freedom in setting the reduction ratio.

(Problem to be solved by the invention) This invention takes into consideration the above points, and in an engine using a unit swing type engine, the secondary transmission mechanism is simplified to reduce the weight, and to achieve low cost and
The purpose of this invention is to obtain a transmission device for a two-wheeled motor vehicle with improved running stability.

[Structure of the idea]

(Means for Solving the Problems) In line with the above purpose, the transmission device for a two-wheeled vehicle of this invention is a unit swing type engine in which the engine part and the rear wheel swing up and down as a unit, from one outside side of the crankcase to the rear. An independent planetary roller chamber recessed inward and covered with a cover is formed at the rear end of the swing case extending to the swing case. There is a V between the rotatable driven V pulley on the driven shaft supported by the roller chamber cover.
A belt transmission mechanism is constructed, and a centrifugal starting clutch is installed between the driven V pulley and the driven shaft, and the centrifugal starting clutch is mounted on the outside of the driven shaft. A planetary roller mechanism constituted by a pinion roller rolling between rollers is housed, the ring roller is fixed to the planetary roller chamber, and the sun roller is connected to the planetary roller chamber of the driven shaft supported by the cover. A carrier shaft that supports the pinion roller is formed at the outer end of the rear axle. In addition to being supported, the inner end projects outside, and the rear wheel is fixed to this projecting end.

(Function) With this structure, the driven V pulley on the driven shaft is driven (deceleration) using the V belt transmission mechanism as primary transmission from the drive V pulley on the crankshaft, and the starting clutch is driven from the driven V pulley. The driven shaft is driven via the driven shaft, and the rear axle is driven from the driven shaft using the planetary roller mechanism as secondary transmission (deceleration).

The V-belt transmission mechanism is housed in a dry belt chamber, the planetary roller mechanism is housed in a wet planetary roller chamber, and the driven shaft and rear wheel are arranged on the same axis. Furthermore, since the ring roller is fixed to the planetary roller case and the sun roller is tightly assembled with the pinion roller in between, the inner end of the driven shaft forming the sun roller is substantially supported by a roller bearing. The outer end of the rear axle is pivotally supported on the inner end of its driven shaft.

The driven shaft and rear axle are coaxially integrated,
Only one bearing member is required for each of them. The structure of the rear part of the unit case is simplified and lightened, improving driving performance.

(Example) The following describes an example of this invention with reference to figures.

A crankcase 3 that pivotally supports a crankshaft 2 of an engine 1 has a unit case 4 extending rearward integrally therewith, a cover 5 attached thereto, and a belt chamber 6 formed therein. The crankshaft 2 projects into the belt chamber 6, and a drive V pulley 7 is pivotally supported at its projecting end.

A planetary roller case 8 is formed at the rear of the unit case 4, and a cover 9 constitutes an independent planetary roller chamber 10. A driven shaft 11 is pivotally supported through the cover 9, and a driven V pulley 12 is rotatably supported within the belt chamber 6. This driven V-pulley 12 and the drive V-pulley 7 are coupled by a V-belt 13 to constitute a V-pulley transmission mechanism as primary transmission. Driven V pulley 1
2 is transmitted to the driven shaft 11 via a starting clutch 14 that utilizes centrifugal force.

The planetary roller chamber 10 has a planetary roller mechanism (second
) will be placed. The sun roller 15 is formed at the inner end of the driven shaft 11, the ring roller 16 is fixed to the planetary roller case 8, and a pinion roller 18 pivotally supported by a carrier 17 intervenes between it and the sun roller 15 with the required pressure. be done. The rear axle 19 is coaxially supported with the driven shaft 11 through the planetary roller case 8, and the carrier 17 is integrally formed at the end on the side of the planetary roller chamber 10. The driven shaft 11 and the rear axle 19 are rotatably aligned with each other. A rear wheel 20 is fixed to a rear axle 19 that projects outward from the planetary roller chamber 10. In this way, a planetary roller mechanism is interposed between the driven shaft 11 and the rear axle 19, resulting in secondary transmission.

The rotation of the crankshaft 2 is controlled by a belt transmission mechanism.
It is transmitted to the rear axle through secondary transmission and a planetary roller mechanism. As a modification (not shown), a chain transmission mechanism may be used for primary transmission, and the effect is the same.

In this way, since the driven shaft and the rear axle can be set concentrically, the case housing this part can be made more compact and lighter than the conventional case in which at least two or more shafts are arranged side by side.

In addition, since the planetary roller mechanism supports the inner end of the driven shaft 11 and the outer end of the rear axle 16 by a function equivalent to a roller bearing whose outer periphery is fixed to the planetary roller case 8, bearing members are necessary for this part. can be stored, which helps simplify the structure and reduce weight.

By reducing the weight of the rear part of the unit case, which is far from the center of the swing, the unsprung load can be reduced.
As the cushion unit becomes smaller, running performance becomes more stable.

In combination with a V-belt transmission mechanism that makes the inside of the unit case dry, it is easy to form an independent chamber that makes the planetary roller mechanism wet, improving productivity and reducing costs of the case itself. Furthermore, the planetary roller mechanism has a wide degree of freedom in setting the reduction ratio and acts as a torque limiter, so it relieves the shock torque from the rear wheels and prevents it from being transmitted to the crankshaft. Therefore, the strength of each part can be reduced, and in this respect, it can be made smaller and more compact, resulting in lower costs.It also allows for smooth torque transmission without bumps, reduces noise, and eliminates wear particles and gear cracks. It has the advantage of being highly durable.

[Effect of idea]

As described above, the transmission mechanism of the motorcycle according to this invention is a unit swing type engine in which the engine part and the rear wheel swing up and down together, and the rear end of the swing case extending rearward from one outside side of the crankcase. An independent planetary roller chamber is formed inwardly and covered with a cover, and a drive V is mounted on a crankshaft protruding from the swing case.
A V belt transmission mechanism is constructed between the pulley and a rotatable driven V pulley on a driven shaft pivotally supported by the cover of the planetary roller chamber, and the driven V
A centrifugal starting clutch mounted on the outside of the driven shaft is interposed between the pulley and the driven shaft, and the planetary roller mechanism chamber is equipped with a ring roller, a sun roller, and a pinion roller that rolls between the two rollers. The ring roller is fixed to the planetary roller chamber, the sun roller is formed at the protruding end of the driven shaft pivotally supported by the cover into the planetary roller chamber, while the pinion roller is fixed to the planetary roller chamber. A carrier shaft supporting the is formed at the outer end of the rear axle, and the outer end of the rear axle is aligned with the inner end of the driven shaft, the center part is pivotally supported on the indoor wall of the planetary roller, and the inner end is connected to the outdoor wall. The rear wheel protrudes and the rear wheel is fixed to this protruding end, and the secondary transmission mechanism is compactly constructed, which has the effect of reducing costs and improving the running performance of the two-wheeled motor vehicle.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a unit swing type engine showing an embodiment of this invention, and Figure 2 is a cross-sectional view of the unit swing type engine shown in Figure 1.
FIG. 3 is a side view of the planetary roller mechanism as seen from the arrow. DESCRIPTION OF SYMBOLS 1... Engine, 2... Crankshaft, 3... Crank case, 4... Unit case, 6... Belt chamber, 7... Driven V pulley, 8... Planetary roller case, 11... Driven shaft, 12 ... Driven V pulley, 13 ... V belt, 14 ... Starting clutch, 15 ... Sun roller, 16 ... Ring roller, 17 ... Carrier, 18 ... Pinion roller, 19 ... Rear axle, 20 ... Rear wheel .

Claims (1)

[Scope of utility model registration request] In a unit swing type engine in which the engine part and the rear wheel swing up and down together, an independent planet is recessed inward and covered with a cover at the rear end of the swing case that extends rearward from one outside of the crankcase. A roller chamber is formed, and a V belt is installed between a drive V-pulley mounted on a crankshaft protruding from the swing case and a rotatable driven V-pulley on a driven shaft supported on a cover of the planetary roller chamber. A transmission mechanism is constructed, and a centrifugal starting clutch is installed between the driven V pulley and the driven shaft, and the centrifugal starting clutch is mounted on the outside of the driven shaft. A planetary roller mechanism constituted by a pinion roller rolling between the two is housed, the ring roller is fixed in the planetary roller chamber, and the sun roller is
A carrier shaft that supports the pinion roller is formed at the outer end of the rear axle, and the rear axle has an outer end inside the driven shaft. 1. A transmission device for a two-wheeled motor vehicle, characterized in that the central part is pivotally supported on an indoor wall of a planetary roller, the inner end projects outside, and a rear wheel is fixed to this projecting end.