DE4435037C2 - Arrangement of a power unit swing arm on motorized two-wheeled vehicles - Google Patents

Description

The invention relates to an arrangement of a power unit swing arm on motorized Two-wheeled vehicles in the category of the main claim.

The need for such constructions arises from the fact that all known scooter constructions, in particular with a power swing arm, a have conventional suspension of the rear wheel. The power unit swing arm is about one shock absorber mounted on one side supported on the rear frame. The problem of Vibration decoupling of the engine rocker and frame is sometimes encountered elastic bushings or damped intermediate levers, which, however, have the elasticity or the possible direction of movement is usually not subject to any constraint. In contrast to Motor scooters, for which the power unit swing arm is now part of the state of the art, the lever system for rear wheel swing has prevailed primarily on motorcycles, here, however, with swing arm bearings without an elastic intermediate link, since the load on the Swing arm mounting through the use of lever-assisted suspension systems increases significantly. This problem can be solved by different constructions understand, so also in US Patent 3 907 332, in which a suspension system in its Function is shown. You can see the separation of the pivot point and Bearing of the shock absorber as well as the position of the toggle lever, all constructive Solutions of lever-supporting spring systems. DE 27 11 404 A1 describes a Motorcycle rear wheel suspension system described, which is also of rigid swing pivot and abutment of the shock absorber on the frame. In DE 34 36 869 C2 describes a rear suspension for a motorcycle in which also the rigid Swing arm pivot point, needle bearing intermediate lever and frame support of the spring are recognizable.

The disadvantage of the above solutions is that these systems the transfer to a scooter with a power train swing arm significantly higher forces cause that lead to the fact that when using z. B. conventional silentblocs used for Vibration damping between the engine swingarm and the frame must be relatively soft  must, a self-steering behavior caused by the lever system when deflecting can occur. This self-steering behavior is the result of the lever system Significantly increasing forces at the pivot point, which also harden the can lead to elastic swing arm suspension.

From JP 1-226 486 A is a generic arrangement of a lever-assisted Power train swing arm known, but in the arrangement and design of a Anti-vibration lever and the one formed from the tension strut and the rocker arm Coupling lever unit a force reaction on the anti-vibration lever with resulting Movement to its stop position cannot be excluded. That would make it Desired vibration decoupling cannot be achieved.

A shock absorber linkage is also known from US Pat. No. 4,076,271 Swing axis of rotation in motorcycles, but in contrast to the proposed Solution a vibration decoupling a power unit swing is not the subject of Registration is. The aim of the US patent is only a force as well Translation of the cycle path to the actuating lever of the shock absorber.

Starting from an arrangement of the type mentioned at the outset, there is the task of Invention, with good vibration decoupling, the self-steering behavior of the Reduce power train swingarm.

According to the invention the object with the characterizing features of claim 1 solved. This special positioning of the shock absorber and its support the shock absorber reaction force is introduced into the swing arm bolts. there the free resulting force on the swing arm can then be roughly aligned in its direction the main axis of a screw of an elastic body coincide. That is achieved by the movable arrangement of a tension strut relative to the pivot point of the Drive unit swing arm, which is articulated with a rocker arm. The other end the rocker arm is movably attached to the main frame. In the joint between Tension strut and rocker arm is a shock absorber, which is advantageously about 15 ° to the road can be inclined, with its front bearing movably mounted. The rear bearing of the The shock absorber is attached to a support bearing by a support fork, which supports the force of the shock absorber introduces other components into the pivot point of the power unit rocker.  

An elastic swing arm bearing consists of a connecting body, which is the connection to the main frame and a support bracket, which is the fulcrum of the Drive unit swing arm fixed. About a screw and an elastic body is one Connection between support bracket and connector body reached.

drawings

An embodiment of the object of the invention is in the drawings shown and is described in more detail below.

Fig. 1 shows a silentbloc for receiving the power unit swing arm of a scooter.

In Fig. 2, a support bearing her a shock absorber, which initiates its reaction force in the swing pivot, can be seen.

Fig. 3 shows a schematic side view of a motor scooter with a set swing arm.

Description of the embodiment

In Fig. 3, a scooter is shown with power train swing arm 5 , in which a main frame 1 can be seen, a rocker arm 2 articulated at the pivot point 6 on the main frame 1 , a shock absorber 3 connected to the rocker arm 2 , which is inclined about 15 ° to the road , a tension strut 4 , which connects the rocker arm 2 to the drive unit rocker arm 5 in an articulated manner, and the rear bearing 7 of the shock absorber 3 , which is fastened to the support bearing - shown in FIG. 2. The above-mentioned support bearing consists of a support fork 13 in which the rear bearing of the shock absorber 7 is fastened. Furthermore, a cross tube with bushing 12 can be seen in FIG. 2, in which there is an elastic guide bushing 14 and further transmission elements which introduce the force of the shock absorber into the fulcrum 15 of the drive unit rocker 5 . The one side of the elastic rocker bearing shown in Fig. 1 consists of a connecting body 8 , which connects to the main frame 1 . A support bracket 9 , which fixes the fulcrum 15 of the drive unit rocker 5 , is in contact with the connecting body 8 via a screw 10 and an elastic body 11 .

Reference list

1

Main frame

2nd

Rocker arm

3rd

Shock absorber

4th

Tension strut

5

Power train swingarm

6

Pivotal point on the main frame

7

rear bearing of the shock absorber

8th

Connector body

9

Support bracket

10th

screw

11

Elastic body

12th

Cross tube with socket

13

Support fork

14

Guide bushing

15

Pivotal point of the rocker arm

Claims (3)

1. Arrangement of a drive unit rocker arm ( 5 ) on motorized two-wheeled vehicles, in particular motor scooters, with an oscillating pivot point mounted elastically on a main frame ( 1 ) (on the support bracket 9 ) for the drive unit rocker arm ( 5 ), with a rocker arm ( 2 ) articulated on the main frame ( 1 ) and a tension strut ( 4 ) which connects this ( 2 ) and the drive unit rocker to one another in an articulated manner and with a shock absorber ( 3 ) connected at one end to the rocker arm ( 2 ), the longitudinal axis of which is directed approximately towards the rocker pivot point, characterized in that the other End of the shock absorber ( 3 ) as its rear end is connected to the swingarm pivot via a support fork ( 13 ) and further connecting elements. 2. Arrangement according to claim 1, characterized in that the longitudinal axis of the shock absorber ( 3 ) is inclined approximately 15 ° to the roadway and the shock absorber ( 3 ) is in the direction of travel in front of the drive unit rocker ( 5 ). 3. Arrangement according to claim 1 or 2, characterized in that the pivot point is fixed to a support bracket ( 9 ) which is connected via an elastic body ( 11 ) with a on the main frame ( 1 ) connecting body ( 8 ).