DE102016118570B4 - Reinforced carbon fiber rim - Google Patents

Abstract

Reinforced carbon fiber rim, comprising: a rim body (1) made of carbon fiber and having an outer periphery (11) connected to the tire and an inner periphery (12) assembled with the hub and spokes, with two opposite side walls (13) between the inner circumference (12) and the outer circumference (11) are formed, and several reinforcement disks (2) made of a metallic material, which are encased by the rim body (1) made of carbon fiber, characterized in that the reinforcement disks (2) have two radially extending ones Opening circulations (21) and a central ring section (22) connecting the two opening rotations (21) are formed on the inner circumference (12) of the rim body (1), where the spokes are attached, the material from the central ring section (22) to the two Opening revolutions (21) is becoming thinner, and the central ring section (22) on the inner circumference (12) of the rim body (1) with a reinforcing section tt (221) is provided, which has a group of through holes (222) for connection to spokes, and wherein reinforcement walls (223) are provided in place of the side walls (13) of the rim body (1) on both sides of the reinforcement section (221) , and wherein the reinforcement walls (223) towards the reinforcement section (221) become increasingly thicker.

Description

[Technical field]

The invention relates to a reinforced carbon fiber rim according to the preamble of claim 1, which is characterized by high tensile strength and light weight.

[State of the art]

Bicycle rims are usually made of aluminum or carbon fiber. The two types of bicycle rims each have advantages and disadvantages. Aluminum rims, for example, are characterized by high ductility and lower manufacturing costs. Nevertheless, such rims have a low hardness and a higher weight. In contrast to aluminum rims, carbon fiber rims are characterized by higher hardness and lighter weight. However, such rims have lower ductility and high manufacturing costs. Nowadays, carbon fiber composite materials are used in components of a high-quality bicycle. Thanks to its high strength, high rigidity and light weight, the carbon fiber composite material is undoubtedly a suitable material for components of a bicycle in order to meet the high requirements in the bicycle industry.

When manufacturing a carbon fiber rim, the manufacturing costs and the weight should be taken into account. Common carbon fiber rims are mostly ring-shaped and hollow. To manufacture multilayer carbon fiber fabrics must be pressed together after heat treatment. In some places, for example holes for mounting spokes, the strength of the rim cannot be guaranteed. After curing, the ductility of the rim is reduced. Due to the hollow structure and the load on the spokes, the strength of the rim is reduced so that it can be easily damaged.

If the rim is subject to a tensile force, the risk of breakage at the spoke mounting point is very high, which prevents normal operation of the rim.

With regard to the disadvantages mentioned, there is a multi-layer reinforcement element from the Taiwanese patent publication TW 1374814 B known that is attached to at least one side portion of the inner ring portion. The multi-layer reinforcing element includes an inner portion of the rim, an outer portion of the spokes and a central portion, which is located between the inner portion of the rims and the outer portion of the spokes and is designed in a conical sword shape. The conical sword shape contains at least two layers and at least four sloping side zones. From another Taiwanese patent TW 1341799 B Another bicycle rim is known, which consists of ring-shaped metal and has two opposing ring-shaped brake surfaces and a plurality of mounting zones for spokes. At least one mounting opening for spokes is provided in each assembly zone. In addition, the bicycle rim is provided with a reinforcing element which is stacked on an outer surface of the ring-shaped metallic rim, the two opposite ring-shaped brake surfaces not being covered. The reinforcing element has a plurality of mounting zones for spokes on the circumference, which are stacked with mounting openings. The assembly zones consist of a plurality of first and second reinforcement sections. The first reinforcement sections are built around the mounting holes for spokes. The second reinforcement sections are built on the assembly zones and stacked on top of the first reinforcement sections. The second reinforcement sections are larger than the first reinforcement elements.

• Mit Hilfe des Aufbaus wird nur die Außenseite an Speichen teilweise verstärkt, wodurch das Gewicht erhöht wird. An Stellen, wo das Verstärkungselement haftet, können Spannungen durch Ziehen der Speichen entstehen, was zum Bruch der Haftstellen führen kann.

This structure has the following disadvantages:

• With the help of the structure, only the outside of the spokes is partially reinforced, which increases the weight. In places where the reinforcement element sticks, tensions can arise through pulling the spokes, which can lead to the breakage of the sticking points.

With this structure, it cannot be ruled out that faulty rims arise when the carbon fiber layer is transferred.

This also increases the manufacturing costs.

Further are from the patent application publications US 2012/0324730 A1 and US 2015/0251489 A1 Reinforced carbon fiber rims with the features of the preamble of claim 1 known, the reinforcing pieces, however, only form an anchor for the spokes and do not reinforce the side walls of the rim.

OBJECT OF THE INVENTION

The invention is therefore based on the object to provide a reinforced carbon fiber rim which is distinguished by higher tensile strength and lighter weight.

This object is achieved according to the invention by a reinforced carbon fiber rim which has the features specified in claim 1. Further advantageous developments of the invention emerge from the subclaims.

According to the invention, there is provided a reinforced carbon fiber rim, comprising: a rim body made of carbon fiber and having an outer periphery connected to the tire and an inner periphery assembled with the hub and spokes, two opposite side walls being formed between the inner periphery and the outer periphery and a plurality of metallic reinforcing washers encased by the rim body made of carbon fiber, two opening circumferences radially and a central ring portion connecting the two opening circumferences being formed on the inner circumference of the rim body where the spokes are attached, and the material being from the central ring portion to the two opening revolutions is becoming thinner and thinner, and the central ring section on the inner circumference of the rim body is provided with a reinforcing section which is provided on both sides with reinforcing walls, and wherein the reinforcing walls for the reinforcing section tt become thicker and thicker, which significantly increases the tensile strength of spokes and ensures a lighter weight.

According to the invention, the reinforcement section for connection to spokes has a group of through holes.

According to the invention, the material for producing the reinforcement disk is selected from a group comprising aluminum, magnesium or aluminum-magnesium alloy.

According to the invention, the reinforcement walls become thicker towards the reinforcement section, the ratio between the thinnest and the thickest point being in the range from 1: 3 to 1: 6.

Figure list

• 1 eine perspektivische Darstellung einer erfindungsgemäßen Verstärkungsscheibe;
• 2 einen Radialschnitt durch die erfindungsgemäße Verstärkungsscheibe in Verbindung mit einem Felgenkörper;
• 3 einen Schnitt durch einen erfindungsgemäßen mittleren Ringabschnitt; und
• 4 eine Gesamtansicht der erfindungsgemäßen Konstruktion in Verbindung mit dem Felgenkörper.

The invention and its configurations are explained in more detail below with reference to the drawings. In the drawings:

• 1 a perspective view of a reinforcing washer according to the invention;
• 2nd a radial section through the reinforcing washer according to the invention in connection with a rim body;
• 3rd a section through a central ring portion according to the invention; and
• 4th an overall view of the construction according to the invention in connection with the rim body.

[Explanation of the Preferred Embodiment]

Referring to 1 to 3rd the carbon fiber rim according to the invention has a rim body 1 and several metallic reinforcement washers 2nd which are explained in more detail below.

The rim body 1 consists of carbon fiber and has an outer circumference connected to the tire 11 and an inner circumference assembled with the hub and spokes 12 on. Between the inner circumference 12 and the outer circumference 11 are two opposite side walls 13 educated.

The several metallic reinforcement washers 2nd are made with the carbon fiber of the rim body 1 envelops. On the inner circumference 12 of the rim body 1 Where the spokes are attached are two opening rounds 21st radial and one of the two opening revolutions 21st connecting middle ring section 22 intended. From the middle section of the ring 22 to the two opening rounds 21st the material is getting thinner. The middle section of the ring 22 is on the inner circumference 12 of the rim body 1 with a reinforcement section 221 provided a group of through holes for connection to spokes 222 having. On both sides of the reinforcement section 221 are reinforcement walls 223 in the place of the side walls 13 of the rim body 1 intended. From the reinforcement walls 223 to the reinforcement section 221 the material is getting thicker.

To produce the carbon fiber rim, carbon fiber fabrics are glued together and shaped around the rim body 1 to build ( 1 to 3rd ). At least six to eight carbon fiber fabrics must be stacked on each side, offset. This is a conventional method of manufacturing carbon fiber rims, not a patent of the invention. The reinforcement washers are used for production 2nd in places of spokes, first inserted in a tool. The reinforcement washers 2nd can consist of aluminum, magnesium or aluminum-magnesium alloy. The number of reinforcement washers 2nd depends on the size and number of spokes. As in 4th shown, 24 reinforcement disks are attached to 24 spokes.

The reinforcement washers are in the tool 2nd glued together from the inside out with carbon fiber fabrics. The glued carbon fiber fabrics are from the middle ring section 22 to the two opening rounds 21st tapered so that a tight connection between the carbon fiber fabrics is guaranteed and a one-piece construction is possible. Because the material from the reinforcement walls 223 to the reinforcement section 221 the side walls can become thicker and thicker 13 also tightly glued together with the carbon fiber fabrics, such that the reinforcement walls 223 with the side walls 13 of the rim body 1 get connected.

To optimally counteract the tensile force on spokes, the optimum ratio is determined by repeated attempts. The ratio of the thinnest to the thickest side is preferably between 1: 3 and 1: 6, in the case that the reinforcement walls 223 to the reinforcement section 221 are getting fatter.

• Der Erfindung gemäß sind metallische Verstärkungsscheiben an Stellen der Felge, wo die Speichen angebracht werden sollen, angeordnet, wodurch die Felge effektiv verstärkt und ihre Zugfestigkeit erhöht wird.
• Der Erfindung gemäß werden die metallischen Verstärkungsscheiben nur an Stellen der Felgen, wo die Speichen angebracht werden sollen, angeordnet. Durch die Verteilung der metallischen Verstärkungsscheiben an wichtigen Punkten wird einerseits die Zugfestigkeit erhöht, andererseits ein leichteres Gewicht gewährleistet.
• Der Erfindung gemäß wird die Felge zum Öffnungsumlauf immer dünner. Dadurch können Kohlefaser-Gewebe während Herstellung des Felgenkörpers dicht zugeklebt werden. Auf diese Weise kann ausgeschlossen werden, dass Spalt während der Herstellung entsteht und die Stärke der Felge somit beeinträchtigt wird.
• Der Erfindung gemäß werden die Verstärkungswände zum Verstärkungsabschnitt immer dicker und können somit beim Zusammenkleben der Kohlefaser-Gewebe mit den Seitenwänden der Felge verbinden, um das Belastungsvermögen der Seitenwände zu erhöhen.

Compared to conventional technology, the invention is characterized by the following advantages:

• According to the invention, metallic reinforcement disks are arranged at locations on the rim where the spokes are to be attached, whereby the rim is effectively reinforced and its tensile strength is increased.
• According to the invention, the metallic reinforcement disks are only arranged at locations of the rims where the spokes are to be attached. By distributing the metal reinforcement washers at important points, the tensile strength is increased on the one hand, and a lighter weight is guaranteed on the other.
• According to the invention, the rim for opening circulation is becoming ever thinner. As a result, carbon fiber fabrics can be sealed tightly during manufacture of the rim body. In this way, it can be excluded that a gap arises during manufacture and the strength of the rim is thus impaired.
• According to the invention, the reinforcement walls for the reinforcement section become increasingly thicker and can therefore bond to the side walls of the rim when the carbon fiber fabrics are glued together, in order to increase the load capacity of the side walls.

Claims (3)

Reinforced carbon fiber rim, comprising: a rim body (1) made of carbon fiber and having an outer periphery (11) connected to the tire and an inner periphery (12) assembled with the hub and spokes, with two opposite side walls (13) between the inner circumference (12) and the outer circumference (11) are formed, and a plurality of reinforcement disks (2) made of a metallic material, which are encased by the rim body (1) made of carbon fiber, characterized in that the reinforcement disks (2) with two radial extending opening revolutions (21) and a central ring portion (22) connecting the two opening revolutions (21) are formed on the inner circumference (12) of the rim body (1), where the spokes are attached, the material from the central ring portion (22) to the two opening revolutions (21) is getting thinner, and the middle ring section (22) on the inner circumference (12) of the rim body (1) with a reinforcement section Cut (221) is provided, which has a group of through bores (222) for connection to spokes, and wherein reinforcement walls (223) are provided in place of the side walls (13) of the rim body (1) on both sides of the reinforcement section (221) , and wherein the reinforcement walls (223) towards the reinforcement section (221) become thicker and thicker. Reinforced carbon fiber rim after Claim 1 , characterized in that the ratio between the thinnest and the thickest point is in the range from 1: 3 to 1: 6. Reinforced carbon fiber rim after Claim 1 , characterized in that the material for producing the reinforcement disc (2) is selected from a group comprising aluminum, magnesium or aluminum-magnesium alloy.

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