DE112020007640T5 - Fork Bushing and Fork Assembly - Google Patents

Abstract

Fork bushing for fitting onto an end of a fork shaft (FS) for supporting the fork shaft (FS), the bushing comprising: a main body (10) which is tubular; and a positioning portion (20) disposed at an axial end of the main body (10), an inner peripheral wall of the positioning portion (20) partially protruding radially inward or being recessed radially outward to form a positioning portion, the positioning portion for positive interaction with a positioning ring (S11) on the fork shaft (FS) is used to define an axial position of the bushing on the fork shaft (FS). The invention also relates to a fork assembly.

Description

The present invention relates to a field of a fork, and more particularly to a bushing for a fork shaft and a fork assembly including the bushing.

For transmissions with z. B. several gears, it is often necessary to use a fork to shift.

1 shows a possible fork assembly F consisting of a fork shaft FS and a fork FF attached to the fork shaft FS. In gear shifting, the fork shaft FS drives the fork FF to reciprocate in the axial direction. The fork shaft FS is provided at two ends with a bushing B to support the fork shaft FS.

2 is a schematic exploded view of 1 , wherein a cross section of the fork shaft FS is rectangular and a cross section of an inner peripheral wall of the bushing B is also rectangular. The axial center of the bush B is provided with a bush bolt hole B0 penetrating radially, and correspondingly the yoke shaft FS is provided with a shaft bolt hole S0. After bushing B is fitted onto yoke shaft FS, a locating pin P is used to pass through bushing bolt hole B0 and shaft bolt hole S0 to axially position bushing B and yoke shaft FS.

However, when the positioning pin P is pressed into the bushing pin hole B0 and the shaft pin hole S0, excess materials such as burrs in the hole are easily squeezed out. For example, usually the bushing B is a plastic part and the yoke shaft FS is a metal part, whereby plastic chips and metal chips are generated during installation of the positioning bolt P. This leads, for example, to a decrease in cleanliness in the transmission.

An object of the present invention is to overcome or at least mitigate the shortcomings of the above prior art and to provide a yoke bushing with a simple structure and good installation efficiency and a yoke assembly including the bushing.

• einen Hauptkörper, der röhrenförmig ist; und
• einen Positionierteil, der an einem axialen Ende des Hauptkörpers angeordnet ist, wobei eine Innenumfangswand des Positionierteils teilweise radial nach innen vorsteht oder radial nach außen zurückgesetzt ist, um einen Positionierbereich zu bilden, wobei der Positionierbereich zum formschlüssigen Zusammenwirken mit einem Positionierring auf der Gabelwelle verwendet ist, um eine axiale Position der Buchse auf der Gabelwelle zu definieren.

According to a first aspect of the present invention, a fork bushing is provided for fitting onto an end of a fork shaft for supporting the fork shaft, the bushing comprising:

• a main body that is tubular; and
• a positioning portion disposed at an axial end of the main body, an inner peripheral wall of the positioning portion partially protruding radially inward or recessed radially outward to form a positioning portion, the positioning portion being used for positive engagement with a positioning ring on the yoke shaft to define an axial position of the bushing on the fork shaft.

• einen Backenkörper, der mit dem Hauptkörper verbunden ist und sich entlang einer axialen Richtung der Buchse erstreckt; und
• einen Backenkopf, der von einer Innenumfangswand des Backenkörpers vorsteht und in den nach innen konkaven Positionierring auf der Gabelwelle hineinragt.

In at least one embodiment, the positioning part includes a plurality of elastic jaws, the plurality of elastic jaws being spacedly distributed in a circumferential direction of the main body, and the elastic jaw comprises:

• a shoe body connected to the main body and extending along an axial direction of the bushing; and
• a jaw head protruding from an inner peripheral wall of the jaw body and protruding into the inwardly concave positioning ring on the fork shaft.

In at least one embodiment, an axial end of the jaw head near the main body forms a jaw head guide, wherein
in an axial region where the shoe head guide is located, the closer it is to the main body, the more an inner peripheral wall of the shoe head extends toward the radially outside of the bushing.

In at least one embodiment, the positioning part further includes a plurality of fixing claws, wherein the fixing claws and the elastic shoes are provided at intervals, and an inner diameter of a cylindrical surface on which an inner peripheral wall of the fixing claw is located is equal to or smaller than an outer diameter of an axial portion of the fork shaft for mounting the jack is.

In at least one embodiment, the inner peripheral wall of the bushing forms an overfit zone partially protruding radially inward, wherein an inner diameter of a cylindrical surface on which an inner peripheral wall of the overfit zone is located is smaller than the outer diameter of the axial portion of the yoke shaft for mounting the bushing.

In at least one embodiment, there are multiple overfit zones, the multiple overfit zones being spaced circumferentially of the bushing.

In at least one embodiment, the overfit zone comprises a plurality of strip-like protrusions extending along the axial direction.

In at least one embodiment, the overfit zone extends from the main body along the axial direction to the positioning portion and corresponds to the attachment claw in the circumferential direction.

According to a second aspect of the present invention, there is provided a yoke assembly comprising a yoke shaft and a bushing fitted on at least one end of the yoke shaft in an axial direction, the bushing being a yoke bushing according to the present invention.

In at least one embodiment, at least one end of the yoke shaft defines a bushing mounting portion, the bushing being mounted on the bushing mounting portion and the positioning ring being in the form of an annular groove or an annular projection on the bushing mounting portion.

In at least one embodiment, an outer diameter of the bushing mounting portion is smaller than an outer diameter of an axially centered shaft main body of the yoke shaft, thereby forming a shaft shoulder between the bushing mounting portion and the shaft main body, the bushing abutting the shaft shoulder.

The socket according to the invention is simple in construction, inexpensive to manufacture and easy to assemble with the fork shaft.

• 1 ist eine schematische Darstellung einer möglichen Gabelbaugruppe.
• 2 ist eine schematische Explosionsdarstellung einiger Komponenten von 1.
• 3 ist eine schematische Darstellung einer Gabelbaugruppe gemäß einer Ausführungsform der vorliegenden Erfindung.
• 4 ist eine schematische Explosionsdarstellung einiger Komponenten von 3.
• 5 ist eine schematische Darstellung einer Teilstruktur der Gabelwelle einer Gabelbaugruppe gemäß einer Ausführungsform der vorliegenden Erfindung.
• 6 ist eine schematische Darstellung einer Buchse einer Gabelbaugruppe gemäß einer Ausführungsform der vorliegenden Erfindung.
• 7 bis 9 sind schematische Darstellungen der Buchse und der Gabelwelle der Gabelbaugruppe gemäß einer Ausführungsform der vorliegenden Erfindung im Schnitt während der Montage.

The yoke assembly according to the present invention can achieve axial positioning of the bushing relative to the yoke shaft without using a locating pin, and chips are not easily generated from the component in the assembly process.

• 1 Figure 12 is a schematic representation of a possible fork assembly.
• 2 is a schematic exploded view of some components of 1 .
• 3 12 is a schematic representation of a fork assembly according to an embodiment of the present invention.
• 4 is a schematic exploded view of some components of 3 .
• 5 12 is a schematic representation of a partial structure of the fork shaft of a fork assembly according to an embodiment of the present invention.
• 6 12 is a schematic representation of a bushing of a fork assembly according to an embodiment of the present invention.
• 7 until 9 12 are schematic sectional views of the bushing and yoke shaft of the yoke assembly according to an embodiment of the present invention during assembly.

Reference List

f

fork assembly

FF

Fork

FS

fork shaft

P

positioning bolts

S0

shaft bolt hole

S1

socket assembly section

S11

positioning ring

S12

shaft shoulder

S1a

waveguide

sm

shaft main body

B

Rifle

B0

bushing bolt hole

brother

overfitting zone

10

main body

10a

chamfer of the main body

20

positioning part

21

Elastic cheek

210

jaw body

211

cheek head

211a

Jaw Head Guide

22

fastening claw

A

axial direction

R

radial direction

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to practice the present invention and are not used to exhaust all possible modes of the present invention or to limit the scope of the present invention.

Referring to the 3 until 9 describes the yoke assembly F and bushing B according to the present invention. Unless otherwise indicated, A in the figures stands for the axial direction of the yoke assembly, the axial direction A coinciding with the axial direction of the bushing in the yoke assembly; R stands for the radial direction of the yoke assembly, where the radial direction R coincides with the radial direction of the bushing in the yoke assembly.

With reference to 3 and 4 the fork assembly F includes a fork shaft FS, a fork FF and a bushing B.

The fork FF is fixed to the fork shaft FS and can reciprocate along the axial direction A with the fork shaft FS. The bushing B is fitted on at least one end of the fork shaft FS (in this embodiment, one bushing B is fitted on both ends of the fork shaft FS). In the radial direction R and axial direction A, the bushing B is fixed relative to the fork shaft FS, whereby the bushing B can move along the axial direction A with the fork shaft FS and can support the fork shaft FS.

Preferably, the bushing B is made of a material that includes plastic.

With reference to 4 , 5 and 7 a structure of the fork shaft FS for mounting the bush B will be described first.

A middle part of the fork shaft FS in the axial direction A is referred to as a shaft main body Sm. Both end portions of the fork shaft FS, which are on both sides of the shaft main body Sm, form a bush mounting portion S1, and the bush B is fitted on an outer periphery of the bush mounting portion S1. For convenience, in the axial direction A, the side where the shaft main body Sm is located is referred to as the inside of the fork shaft FS, and the side where the bush mounting portion S1 is located is referred to as the outside of the fork shaft FS.

A diameter of the bush mounting portion S1 is smaller than a diameter of the shaft main body Sm, whereby a shaft shoulder S12 is formed at a boundary between the bush mounting portion S1 and the shaft main body Sm. One end of bushing B can abut against shaft shoulder S12 to provide axial restraint.

An outer periphery of the socket mounting portion S1 forms a positioning ring S11. The locating ring S11 is used to cooperate with the locating portion 20 on the bushing B, thereby providing an axial constraint for the bushing B.

In the present embodiment, the positioning ring S11 is a depression of a peripheral wall of the socket mounting portion S1, or the positioning ring S11 is an annular groove. In the axial direction A, the positioning ring S11 is located in the area of the socket mounting portion S1 near the outer end but not at the extreme end.

An extreme end of the fork shaft FS forms the shaft guide S1a, the more it goes to the axial inside, the larger an outer diameter of the shaft guide S1a is, or the shaft guide S1a is a chamfer or a rounded corner of the end of the fork shaft FS. The shaft guide S1a is set up in such a way that it is easier to insert the bushing B into the fork shaft FS.

The socket B is shown below using 6 and 7 described.

The bushing B is in the form of a short tube and comprises a main body 10 and a positioning part 20 located at the end of the main body 10, the positioning part 20 being used to cooperate with the positioning ring S11 on the bushing mounting portion S1, thereby providing axial positioning for the bushing B is provided on the fork shaft FS. Preferably, the positioning portion 20 can also provide radial positioning for the bushing B .

Preferably, an inner periphery of an end of the main body 10 facing the axially inner side of the fork shaft FS forms a chamfer 10a to facilitate assembling of the bush B to the fork shaft FS.

In the present embodiment, the positioning part 20 comprises a plurality of elastic jaws 21 and a plurality of fixing claws 22, the elastic jaws 21 and the fixing claws 22 being spaced in the circumferential direction, i. H. the adjacent elastic jaws 21 are spaced by the fixing claw 22, and the adjacent fixing claws 22 are spaced by the elastic jaw 21.

The resilient jaw 21 is used primarily to provide axial positioning for the B bushing. The elastic jaw 21 comprises a jaw body 210 and a jaw head 211.

The shoe body 210 is in the form of a strip connected to the main body 10 and extending along the axial A direction. An inner diameter of the cylindrical surface on which the inner walls of a plurality of shoe bodies 210 are located in the circumferential direction is approximately the same (or preferably slightly larger) an outer diameter of the socket mounting portion S1.

The jaw head 211 is located at the end of the jaw body 210 remote from the main body 10, and in the present embodiment, the jaw head 211 protrudes radially inward from the inner peripheral wall of the jaw body 210, or the jaw head 211 extends radially inward of the jaw body 210 When bushing B is mounted on yoke shaft FS, jaw head 211 protrudes into the groove of locator ring S11, thus providing axial positioning for bushing B and preventing bushing B from falling off yoke shaft FS.

Preferably, an end of the shoe head 211 facing the axial inside of the fork shaft FS forms a shoe head guide 211a. In an axial region where the shoe head guide 211a is located, the inner peripheral wall of the shoe head 211 extends toward the radially outside of the bush B the closer it gets to the axial inside. Alternatively, the jaw head guide 211a is a chamfer or rounded corner of the end of the jaw head 211. The jaw head guide 211a is arranged so that the elastic jaw 21 can be more smoothly inserted into the positioning ring S11 by elastic deformation.

Preferably, the jaw body 210 has a reduced wall thickness to facilitate elastic deformation and recovery of the resilient jaw 21 when assembled with the fork shaft FS. For example, the thickness of the jaw body 210 in the radial direction R is smaller than the thickness of the main body 10 in the radial direction R, and preferably the inner peripheral wall of the jaw body 210 is on the same cylindrical surface as the inner peripheral wall of the main body 10, and the outer diameter of the jaw body 210 is smaller than the outer diameter of the main body 10.

The fixing claw 22 is used to increase the structural strength of the bush B. The inside diameter of the cylindrical surface on which the fixing claw 22 is located is equal to or slightly smaller than the outside diameter of the socket mounting portion S1. Preferably, the thickness of the fixing claw 22 in the radial direction R is equal to the thickness of the main body 10 in the radial direction R, and preferably the inner peripheral wall of the fixing claw 22 is on the same cylindrical surface as the inner peripheral wall of the main body 10, and the outer peripheral wall of the fixing claw 22 is on the same cylindrical surface as the outer peripheral wall of the main body 10.

In the axial direction A, the fastening claw 22 is preferably of the same length as the elastic jaw 21.

Preferably, the inner peripheral wall of the liner B partially forms an overfitting zone Br projecting radially inward, and the inner diameter of the cylindrical surface on which the inner peripheral wall of the overfitting zone Br is located is smaller than the outer diameter of the liner mounting portion S1. Thus, the jack B achieves an overmatching with the jack mounting portion S1 at least in the overmatching zone Br.

Preferably, the overfitting zone Br extends in the axial direction A from the main body 10 to the positioning member 20. In the circumferential direction, the overfitting zone Br is in an area where the fixing claw 22 is located, i.e. the inner peripheral wall of the fixing claw 22 is covered by the overfitting zone Br, and the overfitting zone Br of the inner periphery of each fixing claw 22 extends through the main body 10 along the axial direction A, while the peripheral region where the elastic jaw 21 is located has no overfitting zone Br.

Each overfitting zone Br comprises, for example, a plurality of strip-like protrusions extending along the axial direction A.

The above method of arranging the overfitting zones Br spaced in the circumferential direction not only ensures a tight fit between the bushing B and the yoke shaft FS in the radial direction, but also makes the bushing B not suffer damage such as cracking due to excess overfitting.

The following is related to 7 until 9 the process of assembling the bushing B with the fork shaft FS is described.

First, with reference to 7 the bushing B is centered with the axis of the fork shaft FS, and the bushing B is to be fitted onto the fork shaft FS by aligning the main body 10 with the fork shaft FS.

Next, with reference to 8th the bush B is gradually slid into the bush mounting section S1 until the shoe head guide 211a of the elastic shoe 21 contacts the shaft guide S1a located at the end of the bush mounting section S1.

Finally, with reference to 9 continue to apply a force along the axial direction A, so that the elastic jaw 21 spreads radially outwards and the elastic jaw 21 then resets and the jaw head 211 protrudes into the groove of the positioning ring S11. At the same time, the end face of the main body 10 rests against the shaft shoulder S12.

It is worth noting that, in other possible embodiments, the positioning ring S11 can also be an annular projection arranged on the peripheral wall of the socket mounting portion S1. Accordingly, for example, the inner peripheral wall of the elastic shoe 21 may have a recess, and the protruding positioning ring S11 may protrude into the recess of the inner periphery of the elastic shoe to realize the axial positioning of the bush B.

In this case, preferably, the bushing B is mounted on the fork shaft FS with the elastic jaw 21 facing inward and the main body 10 facing outward to avoid interference between the protruding positioning ring S11 and the main body 10.

• (i) Die erfindungsgemäße Buchse B ist einfach im Aufbau, kostengünstig in der Herstellung und leicht mit der Gabelwelle FS zu montieren.
• (ii) Die Gabelbaugruppe gemäß der vorliegenden Erfindung kann eine axiale Positionierung der Buchse B relativ zur Gabelwelle FS erreichen, ohne einen Positionierbolzen zu verwenden, und im Montageprozess werden Späne nicht einfach aus dem Bauteil erzeugt.

Some advantageous effects of the above embodiments of the present invention will be briefly described below.

• (i) The bush B according to the invention is simple in construction, inexpensive to manufacture and easy to assemble with the fork shaft FS.
• (ii) The yoke assembly according to the present invention can achieve axial positioning of the bushing B relative to the yoke shaft FS without using a positioning pin, and chips are not easily generated from the component in the assembling process.

• (i) Zum Beispiel kann die Befestigungsklaue 22 ebenfalls weggelassen werden, wobei nur mit Hilfe von dem Hauptkörper 10 und der elastischen Backe 21 eine radiale Positionierung der Buchse B und der Gabelwelle FS erreicht wird.
• (ii) Obwohl in der dargestellten Ausführungsform die Außenumfangswand des Buchsenmontageabschnitts S1 und die Innenumfangswand der Buchse B zylindrisch sind, ist dies jedoch nicht zwingend. In anderen möglichen Ausführungsformen können der Querschnitt des Buchsenmontageabschnitts S1 und der Querschnitt der Buchse B ebenfalls nicht kreisförmig sein.

It should be understood that the above embodiments are exemplary only and are not intended to limit the present invention. Those skilled in the art can make various variations and changes to the above embodiments given the teachings of the present invention without departing from the scope of the present invention.

• (i) For example, the fixing claw 22 can also be omitted, achieving radial positioning of the bushing B and the fork shaft FS only by means of the main body 10 and the elastic jaw 21.
• (ii) Although in the illustrated embodiment the outer peripheral wall of the bush mounting portion S1 and the inner peripheral wall of the bush B are cylindrical, this is not essential. In other possible embodiments, the cross section of the socket mounting portion S1 and the cross section of the socket B may also be non-circular.

Claims (11)

Fork bushing for fitting onto an end of a fork shaft (FS) for supporting the fork shaft (FS), characterized in that the bushing comprises: a main body (10) which is tubular; and a positioning portion (20) disposed at an axial end of the main body (10), an inner peripheral wall of the positioning portion (20) partially protruding radially inward or being recessed radially outward to form a positioning portion, the positioning portion for positive interaction with a positioning ring (S11) on the fork shaft (FS) is used to define an axial position of the bushing on the fork shaft (FS). fork bushing claim 1 , characterized in that the positioning part (20) comprises a plurality of elastic shoes (21), the plurality of elastic shoes (21) being spacedly distributed in a circumferential direction of the main body (10), and the elastic shoe (21) comprises: a shoe body ( 210) connected to the main body (10) and extending along an axial direction (A) of the bush; and a shoe head (211) protruding from an inner peripheral wall of the shoe body (210) and protruding into the inwardly concave positioning ring (S11) on the fork shaft (FS). fork bushing claim 2 , characterized in that an axial end of the jaw head (211) close to the main body (10) forms a jaw head guide (211a), wherein in an axial area in which the jaw head guide (211a) is located, the closer it is to the main body (10 ) is, the more an inner peripheral wall of the shoe head (211) extends to the radially outside of the bushing. fork bushing claim 2 , characterized in that the positioning part (20) further comprises a plurality of fixing claws (22), the fixing claws (22) and the elastic shoes (21) being provided at intervals, and an inner diameter of a cylindrical surface on which an inner peripheral wall of the fixing claw (22 ) is equal to or smaller than an outer diameter of an axial portion of the fork shaft (FS) for mounting the bush. fork bushing claim 4 , characterized in that the inner peripheral wall of the bush partially protruding radially inwards forms an overfitting zone (Br), wherein an inner diameter of a cylindrical surface on which there is an inner peripheral wall of the overfitting zone (Br) is smaller than the outer diameter of the axial portion of the fork shaft (FS) for mounting the bushing. fork bushing claim 5 , characterized in that there are a plurality of overfitting zones (Br), the plurality of overfitting zones (Br) being spaced circumferentially of the bushing. fork bushing claim 5 , characterized in that the overfitting zone (Br) comprises a plurality of strip-like protrusions extending along the axial direction. fork bushing claim 5 , characterized in that the overfitting zone (Br) extends from the main body (10) along the axial direction to the positioning part and corresponds to the fixing claw (22) in the circumferential direction. Fork assembly comprising a fork shaft (FS) and a bush (B) fitted onto at least one end of the fork shaft (FS) in an axial direction (A), characterized in that the bush (B) is a fork bush according to any one of Claims 1 until 8th is. fork assembly claim 9 , characterized in that at least one end of the fork shaft (FS) forms a bush mounting section (S1), the bush (B) being mounted on the bush mounting section (S1) and the positioning ring (S11) in the form of an annular groove or an annular projection on the bush mounting section (S1) is formed. fork assembly claim 10 , characterized in that an outer diameter of the bush mounting section (S1) is smaller than an outer diameter of an axially centrally arranged shaft main body (Sm) of the fork shaft (FS), whereby a shaft shoulder (S12) is formed between the bush mounting section (S1) and the shaft main body (Sm). with the bushing (B) resting against the shaft shoulder (S12).

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