Search

CN-122003358-A - Fork rod, telescopic fork and pedal motor vehicle

CN122003358ACN 122003358 ACN122003358 ACN 122003358ACN-122003358-A

Abstract

The invention relates to a fork arm for a telescopic fork, comprising a tubular base body extending along a longitudinal axis, wherein the base body has an upper bearing region and a lower bearing region, and the base body is designed such that the surface moment of inertia of the base body in the direction of travel differs at least partially from the surface moment of inertia of the base body transverse to the direction of travel, each of the surface moments of inertia having its minimum value in the middle region of the fork arm, and the base body has at least one weakened region in which the wall thickness of the base body is reduced in order to adjust the surface moment of inertia.

Inventors

  • M. Divald
  • M. Keck
  • T. Winkler

Assignees

  • 宝马股份公司

Dates

Publication Date
20260508
Application Date
20241021
Priority Date
20231120

Claims (14)

  1. 1. A fork lever (10) for a telescopic fork, said fork lever comprising a tubular base body extending along a longitudinal axis (L), Wherein the base body has an upper support region (16) and a lower support region (18), and The base body is designed such that the area moment of inertia of the base body in the direction of travel (F) differs at least in sections from the area moment of inertia of the base body transverse to the direction of travel, Each of the face moments of inertia has its minimum in the middle region of the yoke (10), and The base body has at least one weakened region (26) for adjusting the area moment of inertia, in which the wall thickness of the base body is reduced.
  2. 2. Fork (10) according to claim 1, wherein the base body is designed such that, in particular in the middle region, the surface moment of inertia in the direction of travel (F) is greater than the surface moment of inertia transverse to the direction of travel.
  3. 3. Fork (10) according to claim 1 or 2, wherein the base body is designed such that the respective moment of inertia of the faces decreases towards the middle region of the fork (10).
  4. 4. Fork lever (10) according to any one of the preceding claims, wherein the at least one weakening zone (26) is arranged substantially centrally between the support zones (16, 18).
  5. 5. Fork lever (10) according to any one of the preceding claims, wherein a plurality of weakening areas (26) are configured in circumferential direction and/or along the longitudinal axis (L).
  6. 6. Fork lever (10) according to any of the preceding claims, wherein the fork lever (10) has a front wall section (20) oriented in the direction of travel (F), an opposite rear wall section (22) and two side sections (24), and a weakening zone (26) is formed in the side sections (24) and in the front wall section (20) and/or the rear wall section (22), respectively.
  7. 7. Fork lever (10) according to any of the preceding claims, wherein the at least one weakened area (26) is formed or shaped by a material removal in the wall of the fork lever (10).
  8. 8. The yoke (10) of claim 7, wherein the material removal is configured as a recess shaped triangularly in cross-section.
  9. 9. Fork lever (10) according to any one of claims 6 to 8, wherein the weakened area (26) configured in the front wall section (20) and/or the rear wall section (22) comprises a complete material removal.
  10. 10. Fork (10) according to claim 9, wherein the complete material removal is configured as an oblong opening (28), the main axis of which extends along the longitudinal axis (L).
  11. 11. Fork lever (10) according to any one of claims 6 to 10, wherein the lateral weakening area (26) is longer than the weakening area (26) in the front wall section (20) and/or the rear wall section (22).
  12. 12. Fork (10) according to any one of claims 7 to 11, wherein the material removal is externally configured on the fork (10) and is in particular mechanically introduced.
  13. 13. Telescopic fork comprising a fork bar (10) according to any of the preceding claims.
  14. 14. Pedal motor vehicle, in particular motorcycle, comprising a telescopic fork according to claim 13.

Description

Fork rod, telescopic fork and pedal motor vehicle Technical Field The invention relates to a fork lever for a fork element of a scooter, in particular a motorcycle, a telescopic fork and a scooter. Background The fork bars of two-wheeled vehicles (such as bicycles or motorcycles) are generally cylindrical tubes having a perfectly circular outer cross-section. It is also known to implement the outer cross section to BE exactly non-circular, so that different mechanical properties can BE provided in different spatial directions, see for example BE1027937A1. However, this approach (in particular in the case of double-bridge forks) has proved to be inadequate for achieving a targeted effect on the deformation of the lower fork bridge relative to the upper fork bridge, and also for achieving a targeted deformation of the fork struts. Disclosure of Invention The object of the invention is therefore to provide a fork lever (Gabelschaft) for a fork of a two-wheeled vehicle, a telescopic fork and a scooter (Kraftrad), wherein the fork lever is intended to have a targeted effect on the deformation of the lower fork bridge relative to the upper fork bridge, and is intended to have a targeted deformation of the fork strut (Gabelholme). This object is achieved by a steering wheel according to claim 1, a telescopic fork according to claim 13 and a pedal motor vehicle according to claim 14. Further advantages and features result from the dependent claims, the description and the drawings. According to the invention, the fork arm for a telescopic fork comprises a tubular base body extending along a longitudinal axis, wherein the base body has an upper bearing region and a lower bearing region, and the base body is designed such that the area moment of inertia of the base body in the direction of travel differs at least partially from the area moment of inertia of the base body transverse to the direction of travel, each area moment of inertia having its minimum value in the middle region of the fork arm, and the base body has at least one weakened region in which the wall thickness of the base body is reduced in order to adjust the area moment of inertia. The weakened region is a region or section of the fork arm or of its base body in which its wall thickness is reduced in a targeted and local manner. A targeted and desired influence or adjustment of the moment of inertia can thus be achieved. Surprisingly, it has been shown that a targeted influence on the deformation of the lower fork bridge relative to the upper fork bridge and a targeted deformation of the fork struts fastened in the fork bridge can be achieved thereby. It has been found that the surface moment of inertia of the fork arm in the direction of travel, in particular in the intermediate region, is expediently greater than the surface moment of inertia transverse to the direction of travel. "in the direction of travel" means here a moment of area inertia about the y-axis and "transversely to the direction of travel" means a moment of area inertia about the x-axis, wherein the x-axis is oriented in the direction of travel, the z-axis is oriented along the longitudinal axis of the fork, and the y-axis is oriented transversely to the x-axis and the z-axis, respectively. According to one embodiment, the above applies over the entire length of the yoke or substantially the entire length of the yoke (between the support areas). The support region serves on the one hand to support the fork arm in the frame of the respective vehicle. Furthermore, the fork bridge is fixed there. The support region generally has a circular (in particular, right circular) outer cross section. According to one embodiment, the yoke is designed such that the respective moment of inertia of the faces decreases in each case towards the middle region of the yoke. Accordingly, according to one embodiment, they each have their minimum value there. The middle region represents a region or section of the yoke that is centrally or substantially centrally located between the support regions. The area moment of inertia is expediently at a minimum both in the direction of travel and transversely to the direction of travel. According to a preferred embodiment, the at least one weakening zone is centrally or substantially centrally configured or arranged between the support zones. According to one embodiment, a plurality of weakening regions can also be introduced in a targeted manner. According to one embodiment, a plurality of weakening areas is configured or provided in the circumferential direction and/or along the longitudinal axis. The influence of these weakened areas on the mechanical properties of the fork arm or the deformation behavior of the entire front wheel guiding composite can be determined experimentally, for example, by simulation or in actual driving operation. The fork lever has a front wall section oriented in the direction of travel, an opposite rear wall section, and two side