JPS59137279A - Regulating structure of wrapping medium 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 The present invention relates to a winding medium adjustment structure for transmitting power for driving an automobile or a two-wheeled vehicle.

Chains, belts, and the like are commonly used in automobiles and two-wheeled vehicles as winding media for tonnage transmission.

This kind of rolled one-hexagram medium stretches in length with use. Therefore, even in types of automobiles and two-wheeled vehicles that transmit Ii power by means of a wound medium, adjustment structures have been adopted to absorb this elongation. has been done.

The conventional falling structure for this type of automobile or two-wheeled vehicle is to hold the rear wheel at the rear end and provide a long rear arm at the rear end of the rear arm itself, which is provided so that it cannot swing vertically. The structure is such that the rear axle is fixed through the rear axle.If the rear wheel Ih is moved backwards in response to the elongation that occurs in the wrapped media, the sprocket fixed to the rear wheel will also move backwards to compensate for this elongation. It is something to absorb.

As a prior art, for example, there is Japanese Patent Application S'l-677/.

By the way, in this structure, it is essential that the axle be long so that it can move rearward, and since the section modulus of the rear arm rapidly decreases in this long part, the rear vehicle 1+
If b is held by 1, the rear holding part I 111 and I'1 becomes smaller accordingly.

This development was made in view of the above circumstances, and its purpose is to provide a winding medium adjustment structure for an automatic two-wheel drive vehicle with poor retention rigidity at the rear.

The purpose of this is to hold the rear arm body and the rear axle.
This is accomplished by forming 1 workpiece into q11 bodies, providing a cylindrical recess in one end, and configuring the other end to be slidably housed.

The illustrated embodiment will be described below.

1 is self Φ force = 2. The frame 21 of the J2 car includes a rear arm 2, which is a rear arm, consisting of a rear arm body 20 and a holding member 3. The rear arm main body 20 is made up of a pair of rectangular cylindrical arm members, and holds the rear wheel 4 via a holding member 3 provided at the rear end. The gear end of the rear arm body 20 is pivotally supported by a pivot shaft 11 provided on the frame 1, and is configured to be swingable in the vertical direction. Note that 5 is a link mechanism and 6 is a shock absorber, which provide a shock absorbing function to the rear wheel 4. 7 is an engine, and 8 is a chain serving as a winding medium. This chain 8 is the sprocket 7 of the engine 7.
1 and a sprocket 41 fixed to the rear part 4 to transmit the engine Φh force to the rear wheel 4.

The holding structure of the rear part 4 of the rear arm 2 is as follows, as shown in FIGS. 2 and 3. An end fitting 21 is fixed to the rear end of the rear arm main body 20 by welding. The end fitting 21 has a substantially cylindrical shape with an open rear end and a cylindrical recess 25.
), slits 22 are provided on the upper and lower surfaces of the rear end.

On both sides of these slits 22 are ears 23a.

23b is formed. A blank hole is formed in one of these ear plates 23a, and a screw hole is formed in the other ear plate 23b. A bolt 24 passes through these blank holes 23& and is screwed into the screw hole 23b, and the holding member 3 inserted into the cylindrical recess 25 of the end fitting 21 is sandwiched and fixed. The front part is configured to have a shape that can be accommodated in the cylindrical recess 25 and can slide within the recess 25, and a rear part 31 for holding the rear axle 42 is formed. The table holding part 31 of No. 3 has an axle through hole 3.
2, a flexible hole 33 provided at the rear thereof, a slit 34, a bolt hole 35, and a bolt 36 that connect these holes. The bolt 35 has a blank hole 35a provided below the slit 34 and a screw hole 3 provided above the slit 34.
It consists of 5 and +. Therefore, the rear axle 42 is connected to the axle through hole 32.
After passing through the rear car 411, tighten the bolt 36.
] 42 is fixed to the holding member 3.

Reference numeral 37 denotes a protrusion provided on the holding member 3, which is connected to the ear plate 23 described above.
Arranged to face the rear end surface of a*23b! , screw the bolt 39 with a lock nut into the screw hole 38, and insert the tip of the bolt 39 into the ear +/X23a+23b.
It is configured to abut against the rear end opening of the chain 8 to adjust the elongation of the chain 8. Note that 30 is a through hole, which is provided to reduce the weight of the holding member 3.

Since the chain is made up of 4Jq in this way, if the chain is stretched, there will be 24.24 bolts and 39 bolts on each side.
By compensating for the lock nut and tightening the bolt 39, the holding member moves back, thereby reducing chain elongation. In this case, unlike the conventional adjustment structure, the mounting structure of the rear wheel axle itself does not have to be loosened, so there is no need to take this into account and the work can be carried out easily. In addition, in the conventional adjustment structure, the tightening force of the rear wheel axle itself was expected to have the force to prevent the axle from moving within a long distance, so it was required to firmly attach the axle, but with the proposed structure, Since holding the axle itself and preventing the axle from moving are made separately, there is no need to firmly tighten the axle itself. Therefore, even if the strength of the spacer that is externally fitted onto the axle is small, there is no problem, so the weight of the spacer can be reduced.

In the embodiments described above, a cylindrical recess is formed in the rear arm, and a holding member is placed inside the rear arm so that the holding member can slide therein. However, conversely, a cylindrical recess is formed in the holding member, and the rear arm rear part is inserted into the cylindrical recess. It may be constructed so that it can be slid internally.

As explained above, the present invention comprises a rear arm and a holding member for holding a single shaft of a rear wheel in 81 parts, and one end is provided with a cylindrical recess so that the other end can be slid. It is stored and fixed in place. Therefore, the wound medium can be adjusted by telescopically sliding the rear arms without forming an elongated rear end portion as in the conventional structure. Therefore, it is possible to prevent the reduction in rear wheel holding rigidity that occurs due to the formation of long holes.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the main parts of an automobile or two-wheeled vehicle, Fig. 2 is an enlarged partially sectional side view of the main parts of this embodiment, and Fig. 3 is a fist 1 which is an arrow view of Fig. 2.・-Frame 2・・・Rear arm 25・・Cylindrical recess 3・・・Holding member 4・・Rear wheel 41・・(rear wheel) sprocket 42・・Rear LIL shaft 7 +φφ curved engine 711・... Engine sprocket 81 ... Winding medium

Claims (1)

[Scope of Claims] A sprocket that outputs power from an engine mounted on a frame; a sprocket fixed to a rear wheel held at the rear end of a rear arm whose front end is pivoted to the frame for single movement; In a two-wheeled motor vehicle having a winding medium that is wound open, the rear arm is composed of a rear arm main body whose front end is freely pivoted to the frame, and a holding part that holds the axle of the rear wheel, A cylindrical recess is formed in one of the rear end of the rear arm body and the front end of the holding member to slidably accommodate the other end, and the two are fitted and fixed to each other for winding around a two-wheeled motor vehicle. Media conditioning structure.