TWM558756U - Bicycle rear derailleur - Google Patents

Abstract

The bicycle rear derailleur includes: a mounting portion for mounting to a bicycle; a link mechanism pivotally connected to the mounting portion and an extension portion for fixing a shifting line, the extending portion being provided with a locking point, An extension portion is located on an inner side of one of the outer sides of the link mechanism; a chain guide mechanism pivotally connected to the link mechanism and rotatable about an axis, including a first guide wheel relatively close to the axis and a relatively remote from the axis a second guide wheel, the first guide wheel has a guide wheel plane, and an extension line defining the axis of the axis and the axis of the second guide wheel is a first reference line; wherein when the bicycle rear derailleur is mounted on the When the bicycle is in a starting position of a relatively low state, the lock line is located between the first reference line and the mounting portion, and the lock line does not cross the guide in the shifting stroke of the bicycle rear derailleur relative to a toothed disc group displacement Wheel plane.

Description

Bicycle rear derailleur

This creation is about a bicycle rear derailleur.

Variable-speed bicycles are widely favored by consumers because their gear positions can be switched according to different force requirements (flat, uphill, downhill, etc.).

Wherein, the transmission of the variable speed bicycle is pivotally connected to a part of the variable speed bicycle through a fixed seat. The transmission is suspended by the fixed seat, and when the shifting line is applied, the displacement member is linked to cause lateral displacement of the chain guide mechanism, thereby causing the chain to change the toothed discs of different sizes on a set of toothed discs. Variable speed function.

However, in the structure of a conventional variable speed bicycle transmission, such as TWI331111, a low profile rear derailleur is disclosed, the actuating arm is disposed between the chain guide and the rear wheel axle, and is mounted when mounted on the frame. The tool or the user's hands are easy to contact with the spokes of the rear wheel, and the installation is difficult, and the actuation arm is provided with a lock line point for locking the cable near one end of the rear wheel spoke. When riding, the cable and the spoke are easily contacted. Collision increases the risk of riding. Therefore, as another patent of CN204096023U, the second link member is disposed laterally outward of the link member, which is easy to install, but the second link is far away from the link member and rides on a mountaineering or off-road environment, the second link It is easy to wrap foreign objects such as branches, and the second link is biased to the outside, and at the same time, the possibility of collision with the road surface is increased, and the mechanism is worn out. The user must frequently check and repair, and increase the maintenance cost.

Therefore, it is necessary to provide a novel and progressive bicycle rear derailleur to solve the above problems.

The main purpose of this creation is to provide a bicycle rear derailleur that can shift smoothly and accurately.

In order to achieve the above object, the present invention provides a bicycle rear derailleur comprising: a mounting portion for mounting to a bicycle; a link mechanism pivotally coupled to the mounting portion and having an extension for fixing a shifting line, the extension The portion is provided with a lock line point, the extension portion is located inside the outer side surface of the one of the link mechanisms; a chain guide mechanism pivotally connected to the link mechanism and rotatable about an axis, comprising a first guide relatively close to the axis And a second guide wheel that is relatively far from the axis, the first guide wheel has a guide wheel plane, and an extension line defining the axis of the axis and the axis of the second guide wheel is a first reference line; When the bicycle rear derailleur is mounted on the bicycle and is in a starting position of a relatively low state, the lock line is located between the first reference line and the mounting portion, and the lock line is displaced in the bicycle rear derailleur relative to a set of toothed discs The guide wheel plane is not crossed during the shifting stroke.

The following is a description of possible implementations of the present invention by way of example only, and is not intended to limit the scope of the creation of the present invention.

Referring to FIGS. 1 through 6, there is shown a preferred embodiment of the present invention. The bicycle rear derailleur 1 of the present invention includes a mounting portion 10, a link mechanism 20 and a chain guide mechanism 30.

The mounting portion 10 is for mounting to a bicycle. The link mechanism 20 is pivotally connected to the mounting portion 10 and is provided with an extension portion 22 for fixing a shifting line. The extending portion 22 is provided with a locking point 11 which is located at an outer side of one of the link mechanisms 20 Inside. The chain guide mechanism 30 is pivotally connected to the link mechanism 20 and rotatable about an axis A. The chain guide mechanism 30 includes a first guide wheel 31 relatively close to the axis A and a second guide relatively far from the axis A. The first guide wheel 31 has a guide wheel plane P1. In the embodiment, the guide wheel plane P1 is a plane that bisects the first guide wheel 31, but the first guide wheel 31 may be a left or right plane, or an axis perpendicular to the first and second guide wheels 31, 32 and passing through the planes of the first and second guide wheels 31, 32, further defining the axis A and the second The extension line of the axis of the guide wheel 32 is a first reference line L1. Wherein, when the bicycle rear derailleur 1 is mounted on the bicycle and is in a starting position P0 of a relatively low state, the locking point 11 is located between the first reference line L1 and the mounting portion 10, and the locking point 11 is on the bicycle The shifting stroke of the rear derailleur 1 relative to the displacement of a set of toothed discs 100 does not cross the guide wheel plane P1. This makes it possible to shift smoothly and accurately.

The mounting portion 10 can be formed in one piece or in multiple pieces. The mounting portion 10 is provided with a wire hole 12 for guiding the shifting wire. One port of the wire hole 12 is directed to a first direction D1, and the first pointing point D1 is obliquely asymptotically directed to the guiding wheel plane P1 without excessive bending. Folding or no additional wire member is required to guide the shifting line. In this embodiment, the other port of the wire hole 12 is directed to a second pointing D2 (here, the same extending line as the first pointing D1). The two directions D2 are gradually away from the guide wheel plane P1 obliquely. For example, the projection of the second direction D2 and the extending direction of the extension portion on the guide wheel plane P1 forms an included angle θ of not less than 60 degrees.

The link mechanism 20 is provided with an extension portion 22, and the extension portion 22 is provided with the lock line point 11. In detail, the extension portion 22 is entirely located inside the outer side surface 21 of the link mechanism 20, and the lock line point 11 is provided. The extension 22 faces away from one end of the link mechanism 20. The link mechanism 20 includes a plurality of links 23 that form a parallel multi-link (eg, four-bar linkage) mechanism, wherein one of the links 23 is located outside the outer side of one of the mounting portions 10 to increase stability during actuation. Sex. Further, the extension portion 22 is integrally formed and protrudes from the link mechanism 20 to form a first-line linear design, but may be a two-piece or other suitable combination structure.

Preferably, the lock point 11 does not cross the second direction D2 during the shifting stroke. Further, a reference plane P2 parallel to the guide wheel plane P1 and located between the link mechanism 20 and the chain guide mechanism 30 is defined, and the lock line point 11 passes over the reference plane P2 during the shifting stroke. In addition, the structure of the present invention can also be changed. For example, the relative state between the link mechanism 20 and the chain guide mechanism 30 is defined as a low-point receiving state PL (if not attached to the bicycle). In the ascending state), when the link mechanism 20 is in the low point receiving state PL, the lock line point 11 is located between the guide wheel plane P1 and the outer side surface 21 of the link mechanism 20, and is located at the first reference The line L1 is interposed between the mounting portion 10. Thus, the bicycle rear derailleur 1 has a wide range of shift strokes with a thin thickness.

1‧‧‧ Bicycle rear derailleur

10‧‧‧Installation Department

11‧‧‧Lock point

12‧‧‧Wire hole

20‧‧‧ linkage mechanism

21‧‧‧Outside

22‧‧‧Extension

23‧‧‧ Connecting rod

30‧‧‧Chain guide

31‧‧‧First guide wheel

32‧‧‧Second guide wheel

100‧‧‧ tooth plate set

A‧‧‧ axis

D1‧‧‧ first point

D2‧‧‧second pointing

L1‧‧‧ first reference line

P0‧‧‧ starting position

P1‧‧·guide wheel plane

P2‧‧‧ reference plane

PL‧‧‧ low point of acceptance

Θ‧‧‧ angle

FIG. 1 is a perspective view of a receiving state of a preferred embodiment of the present invention. Figure 2 is a right side view of Figure 1. Figure 3 is a plan view of Figure 1. Figure 4 is a perspective view showing the unfolded state of a preferred embodiment of the present invention. 5 to 6 are schematic views of the shifting operation of a preferred embodiment of the present invention.

Claims (8)

A bicycle rear derailleur includes: a mounting portion for mounting to a bicycle; a link mechanism pivotally coupled to the mounting portion and having an extension for fixing a shifting line, the extending portion being provided with a locking point, the extension The portion is located on an inner side of one of the outer sides of the link mechanism; a chain guide mechanism pivotally connected to the link mechanism and rotatable about an axis, including a first guide wheel relatively close to the axis and a relatively remote from the axis a second guide wheel having a guide wheel plane defining an extension line perpendicular to the axis and the axis of the second guide wheel as a first reference line; wherein when the bicycle rear derailleur is mounted on the bicycle And in a starting position of the relatively low state, the locking point is located between the first reference line and the mounting portion, the locking point does not cross the guiding wheel in the shifting stroke of the bicycle rear derailleur relative to the displacement of the toothed disk set flat. The bicycle rear derailleur according to claim 1, wherein the link mechanism includes a plurality of links, one of the links being located outside of an outer side of the mounting portion. The bicycle rear derailleur according to claim 1, wherein the mounting portion is provided with a wire hole for guiding the shifting wire, and one of the wire holes is directed to a first direction, and the first pointing direction is obliquely asymmetrically directed to the guiding Wheel plane. The bicycle rear derailleur according to any one of claims 1 to 3, wherein the mounting portion is provided with a wire hole for guiding the shifting wire, and one of the wire holes is directed to a second pointing, the second pointing oblique Gradually away from the plane of the guide wheel. The bicycle rear derailleur according to claim 4, wherein the lock line point does not cross the second direction during the shifting stroke. The bicycle rear derailleur according to claim 4, wherein the link mechanism is provided with an extension portion, the extension portion is provided with the lock line point, defines a plane parallel to the guide wheel and is located at the link mechanism and the chain guide mechanism A reference plane between the jump line crossing the reference plane during the shifting stroke. The bicycle rear derailleur according to claim 4, wherein the projection of the second direction and the extending direction of the extension portion on the plane of the guide wheel forms an angle of not less than 60 degrees. The bicycle rear derailleur according to claim 1, wherein a relative state between the link mechanism and the chain guide mechanism is defined as a low-point receiving state, and when the link mechanism is in the low point The lock line is located between the plane of the guide wheel and the outer side of the link mechanism and between the first reference line and the mounting portion.