JPH05238440A - Stand uprighting device for motorcycle - Google Patents

Abstract

PURPOSE:To speedily upright a stand of a motorcycle and to enable the operation even by a comparatively small electric motor of small power consumption. CONSTITUTION:On an motorcycle with a main stand 6 on the lower part of a body frame 2 free to rotate to an upright position and a storage position, a stand uprighting device is formed by interlocking and connecting an eccentric cam 7 to a rotation axis 6b of the main stand 6 so as to rotate integrally with the main stand 6, connecting one end side of a wire 8 to the outer peripheral surface of this eccentric cam 7 close to it, winding the other end side of the wire 8 around a drive bobbin 9 and devising the shape of the outer peripheral surface where the wire 8 of the eccentric cam 7 is set close so that distance L from the rotational center of the eccentric cam 7 vertically down in the tensile direction of the wire 8 becomes longer as the eccentric cam 7 is rotated from the storage position to the upright position in a stand uprighting device for the motorcycle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stand erection device for a motorcycle for activating a main stand of the motorcycle by using power.

[0002]

2. Description of the Related Art In order to reduce the labor required to stand a main stand of a motorcycle, a stand stand-up device that uses an electric motor is known (for example, Japanese Utility Model Laid-Open No. 55-95).
987). However, the conventional electric stand upright device has a drawback that the operating time from the start of the operation until the vehicle body is brought into a self-supporting state is longer than that in the case of standing up manually, although the operating labor is reduced. In addition, since a considerable amount of force is required to bring a heavy motorcycle body into a self-sustaining state, the electric motor that is inevitably used also becomes large, and as a result, the power consumption for driving the electric motor only increases. In addition, there is a problem that fuel consumption increases due to an increase in vehicle weight.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stand stand for a motorcycle, which allows a quick stand-up operation and can be operated by a relatively small electric motor with low power consumption. is there.

[0004]

The present invention for achieving the above object provides a motorcycle in which a main stand is rotatably attached to a lower portion of a vehicle body frame between an upright position and a storage position.
An eccentric cam is interlockingly connected to the rotary shaft of the main stand so as to rotate integrally with the main stand, one end side of the wire is connected to the outer peripheral surface of the eccentric cam, and the other end side is connected to a drive bobbin. A distance L obtained by winding the outer peripheral surface shape of the eccentric cam along which the wire extends along the wire perpendicular to the pulling direction of the wire from the rotation center of the eccentric cam rotates the eccentric cam from the storage position to the standing position direction. It is characterized in that it is formed so as to become longer as it is made.

When the eccentric cam is rotated by winding a wire around the drive bobbin, the main stand is rotated integrally with the eccentric cam from the storage position to the standing position. Since the outer peripheral shape of the eccentric cam is formed so as to follow the change of the distance L, the rotation speed of the eccentric cam is inversely proportional to the distance L with respect to the constant winding speed of the drive bobbin, and the eccentric cam is quickly moved from the stored position to immediately before the standing position. Can be rotated. On the other hand, since the torque applied to the rotation shaft of the eccentric cam is proportional to the distance L, it can be increased at the standing position requiring a large rotational power. Therefore, it is possible to quickly perform the standing operation and also to enable the operation with a small electric motor.

[0006]

The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, a motorcycle 1 has an engine 3 mounted in an intermediate portion of a body frame 2, and front and rear wheels 4 and 5
Supported by and. Below the body frame 2,
A main stand 6 is provided between the rear portion of the engine 3 and the rear wheel 5 to allow the vehicle body to stand on its own.

As shown in FIG. 2, the main stand 6 has a pair of left and right leg portions 6a, 6a, and an upper rotary shaft 6b thereof is pivotally attached to a bracket 2a fixed to the vehicle body frame 2, It can be alternately switched between a horizontal storage position and a standing position extending downward. Also, the main stand 6
A return spring 10 is provided between the leg portion 6a of the
Is stretched and is held in each position by elastic force when switched to the standing position and the storage position.

An eccentric cam 7 is attached to the rotary shaft 6b of the main stand 6.
Is fixed, and the eccentric cam 7 and the leg portion 6a are kept in a predetermined phase. One end of a wire 8 made of steel stranded wire is connected to the eccentric cam 7 via a locking metal fitting 8a fixed to its end, and is guided along the guide groove 7c to the outer peripheral surface of the eccentric cam 7. It has become so. On the other hand, the other end of the wire 8 has a drive bobbin 9
Is wrapped around. The drive bobbin 9 is connected to an output shaft of an electric motor 11 with a speed reducer via a one-way clutch (not shown). In the illustrated example, the drive bobbin 9 is directly connected to the electric motor 11, but it may be indirectly driven via a suitable reduction gear.

The eccentric cam 7 has the outer peripheral shape of the bottom surface of the guide groove 7a for guiding the wire 8 as shown in FIGS.
B, 3C, and the distance L lowered from the rotating shaft 6b perpendicularly to the pulling direction of the wire 8 is short at the storage position as shown in FIG. 3A and approaches the standing position as shown in FIGS. 3B, 3C. It is formed so that it gradually changes over time.

When the main stand 6 is erected by the stand erection device described above, the drive bobbin 9 is rotated by the electric motor 9 to wind the wire 8. As the wire 8 is wound up, the eccentric cam 7 at the storage position starts to rotate around the rotation shaft 6b as shown in FIG. 3A and changes as shown in FIGS. 3B and 3C. The rotation of the eccentric cam 7 causes the rotation shaft 6 to rotate.
The main stand 6 is rotated against the elastic force of the return spring 10 via b, and is brought into an upright state.

In such an upright motion, the pulling force F with which the drive drum 9 pulls the wire 8 and the pulling speed V are substantially constant. However, since the rotation speed (angular speed) of the rotating shaft 6b that rotates together with the eccentric cam 7 is the circumferential speed having the above-described distance L as the rotation radius and is the same as the take-up speed V, it is inversely proportional to the distance L. .. That is, in FIG. 3A,
When the distance L is short as in FIG. 3B, the rotation is very fast, and as the distance L is large, the rotation is slow as shown in FIG. 3C. Therefore, the main stand 6 quickly rotates to a position close to the standing position where the grounding starts, and rotates slowly after the grounding starts to lift the vehicle body. Therefore, a quick standing operation is possible.

On the other hand, the torque T applied to the rotary shaft 6b
Is the pulling force F of the wire 8 and the above distance L: T = F × L
And is proportional to the distance L. Therefore, a larger torque T is generated as the distance L becomes closer to the standing position. That is, since the torque is set to be large at the standing position where the largest operation power is required to lift the vehicle body, even a relatively small electric motor consuming less power can easily perform the standing operation. is there.

In the stand upright device described above, when returning the main stand 6 to the storage position, it is sufficient to move the vehicle body forward, and the main stand 6 is automatically returned to the storage position by the elastic force of the return spring 10 by the forward movement. You can
In the present invention, if the grounding sensor 12 is attached to both legs 6a, 6a of the main stand 6 as in the illustrated embodiment, only one of the two grounding sensors 12 will be, for example, on the ground when standing up. When a stone is touched, it can be notified and a malfunction can be prevented.
If an alarm device is connected in parallel to the energizing circuit of the electric motor 11, a warning sound can be generated when the electric motor is operating.

[0014]

As described above, according to the present invention, the eccentric cam is driven by the drive bobbin via the wire, and the eccentric cam and the main stand are interlocked with each other. The distance L vertically lowered from the rotation center of the eccentric to the wire pulling direction is formed so as to become longer as the eccentric cam rotates from the storage position to the standing position, so that the eccentric cam can be rotated with respect to the constant winding speed of the drive bobbin. The rotational speed can be made inversely proportional to the distance L, and can be swiftly rotated immediately before the standing position. Further, the torque applied to the rotating shaft of the eccentric cam can be increased in proportion to the distance L as it approaches the standing position. Therefore, a quick stand-up operation can be performed, and a small electric motor can also be operated.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle equipped with a stand upright device according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a main part of the stand upright device.

FIG. 3 is an explanatory diagram of an operation of a main part of the stand upright device.

[Explanation of symbols]

 2 Body frame 6 Main stand 6a Legs 6b Rotating shaft 7 Eccentric cam 7a Guide groove 8 Wire 9 Drive bobbin 11 Electric motor

Claims (1)

[Claims] 1. A motorcycle in which a main stand is rotatably attached to a lower portion of a vehicle body frame between an upright position and a storage position, and an eccentric cam is interlocked with a rotation shaft of the main stand so as to rotate integrally with the main stand. The eccentric cam is connected so that one end side of the wire extends along the outer peripheral surface of the eccentric cam, the other end side is wound around the drive bobbin, and the outer peripheral surface shape of the eccentric cam along which the wire extends is defined as follows. A stand upright device for a motorcycle formed such that a distance L vertically lowered from a rotation center with respect to a pulling direction of the wire becomes longer as the eccentric cam is rotated from a storage position to a standing position direction.