JPH1071986A - Front fork - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an outer tube thin-walled without needing to apply boring to the outer tube and dispense with extra equipment in an assembly line so as to improve machinability and assemblage and to attain weight reduction and cost reduction. SOLUTION: An inner tube is slidably inserted in an outer tube 10 to constitute a fork body. A cylindrical holder 3 is clamp-fitted into an optional position of the periphery of the fork body, and a guide for holding a hose or a wire is fitted to a bracket 19 protrusively provided at the periphery of the holder 3. In a front fork of such constitution, an annular stopper 20 with slip prevention applied to the outer surface is formed at the periphery of the fork body, and a ring-like adaptor 21 is fitted to the periphery of the stopper 20. The holder 3 is fitted to the periphery of the adaptor 21 and clamped, and a protrusion 7 provided at the inner periphery of the holder 3 is fitted into a recessed part formed at the periphery of the adaptor 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front fork which is interposed between a vehicle body and an axle of a motorcycle to attenuate vibration from a road surface and also serves as a front fork, and more particularly to a hose or a wire for holding a hose or a wire. Related to front forks with guides.

[0002]

2. Description of the Related Art As a front fork of this type, for example, the one shown in FIG. 5 has been conventionally developed.

In this front fork A, a vehicle body side inner tube 11 is slidably inserted into an axle side outer tube 10, and the outer tube 10 and the inner tube 11 constitute a fork body. 12 and is connected to the vehicle body via an upper bracket and an under bracket.

On the outer periphery of the outer tube 1, a cylindrical holder 13 provided with a split is attached by tightening a fastening piece 15, and a bracket 14 protruding on the outer periphery of the holder 13 is attached to a hose for a brake or a speedometer. The guide 17 holding the wire 18 is fixed.

When the holder 13 is connected to the outer tube 10, a concave groove 16 is formed on the outer periphery of the outer tube 10, and a projection facing the concave groove 16 is formed on the inner periphery of the holder 13. The two fastening pieces 15 on both sides of the split are fastened by bolts and nuts in a state fitted in the groove 16.

Generally, a holder 1 is provided on the outer periphery of a fork body.
3 and the guide 17, for example, the brake hose 1
When the fork main body 8 is attached to the front side, when the fork main body expands and contracts, a force to rotate the holder 13 due to the bending of the hose 18 acts, the holder 13 rotates, the hose 18 is twisted, and there is a danger that the brake will not work. is there.

Therefore, as shown in FIG.
The protrusion on the holder 13 side is fitted into the concave groove 16 provided on the outer periphery of the outer tube 10 so as to prevent rotation of the outer tube 10 and tightened.

[0008]

In the above-mentioned conventional front fork, since the protrusion on the holder 13 side is fitted in the concave groove 16, the rotation of the holder 13 is prevented, and an excellent effect is exhibited. There is such a defect.

In order to form the concave groove 16 in the outer tube 10, it is necessary to increase the wall thickness of the outer tube corresponding to this portion to prevent the strength from lowering. For this reason, conversely, the weight of the outer tube increases due to the increase in the wall thickness, which increases the material and causes an increase in cost.

[0010] A brake hose 18 is provided on the bracket 1 of the holder 13 to be arranged on the front side of the fork body.
4 needs to be located on the front side of the fork main body, and this arrangement work is performed after the outer tube 10 is fitted to the axle bracket 12. Therefore, the concave groove 16 of the outer tube 10 is inevitably formed after the outer tube 10 is attached to the axle bracket 12.
Is drilled at a position where it comes to the front side of the fork body. In other words, since the drilling of the concave groove 16 in the outer tube 10 is performed after assembling the fork main body, it is necessary to incorporate a drilling step into the assembly line of the factory, and equipment for the drilling is required, and The processing environment worsens the assembly environment where chips are generated.

The depth of the concave groove 16 must be sufficient to prevent the holder 13 from rotating, but the outer tube cannot be made too deep because the outer tube is made as thin as possible to be as light as possible. Therefore, in order to satisfy both functions, the depth processing of the concave groove 16 must be strictly managed, and the processing is difficult.

Therefore, an object of the present invention is to eliminate the need to form a hole in the outer tube, to reduce the thickness of the outer tube, to eliminate the need for extra equipment in the assembly line, and to improve workability and assemblability. It is to provide a lightweight and inexpensive front fork.

[0013]

In order to achieve the above object, according to the present invention, an inner tube is slidably inserted into an outer tube to form a fork body, and an arbitrary outer periphery of the fork body is provided. An annular stopper with a non-slip outer surface on the outer periphery of the fork body in a front fork in which a cylindrical holder is tightened and attached at a position, and a guide that holds a hose or wire is attached to a bracket protruding from the outer periphery of the holder. And a ring-shaped adapter was fitted around the outer periphery of the stopper, the holder was fitted over the outer periphery of the adapter and tightened, and a projection provided on the inner periphery of the holder was fitted into a recess formed on the outer periphery of the adapter. It is characterized by the following.

In this case, the stopper is formed by an annular thick portion formed on the outer periphery of the outer tube, and the outer periphery of the thick portion is provided with a non-slip comprising a number of splines along the circumferential direction. preferable.

Similarly, the adapter is formed of a ring-shaped band made of an elastic material, a hole is formed in the band in the radial direction, and the holder has a split at one end. Of the stopper, a bracket protruding at an arbitrary position on the body, and a protrusion protruding on the inner periphery of the body at a position facing the bracket. The protrusion is fitted into the hole of the stopper. It is preferable to tighten the tightening piece in the state of being set.

Similarly, the holder preferably includes a space into which the adapter is fitted on the inner peripheral side of the main body, a cylindrical portion rising at the center of the upper end of the main body, and an annular groove formed on the outer periphery of the cylindrical portion.

[0017]

FIG. 1 is a block diagram showing an embodiment of the present invention.
4 through FIG.

The front fork A of the present invention comprises a fork main body by slidably inserting an inner tube 11 into an outer tube 10 as in the prior art of FIG. Tube 1
The cylindrical holder 3 is fastened to an arbitrary position of the holder 3, and a guide 17 for holding a hose or a wire 18 is attached to a bracket 19 protruding from the outer periphery of the holder 3.

Further, the front fork of the present invention is shown in FIG.
As shown in FIG. 3, an annular stopper 20 having a spline 8 on its outer surface is formed on the outer periphery of the fork body, and a ring-shaped adapter 21 is provided on the outer periphery of the stopper 20.
And the holder 3 is fitted over the outer periphery of the adapter 21 and tightened, and the projection 7 provided on the inner periphery of the holder 3 is fitted into a hole 9 which is a concave portion formed on the outer periphery of the adapter.

In this case, the stopper 20 is provided as shown in FIGS.
As shown in FIG. 2, the outer tube 10 is formed of a thin annular portion 22 having a narrow width in the vertical direction formed on the outer periphery thereof. The outer periphery of the thick portion 22 is provided with a non-slip comprising a number of splines 8 along the circumferential direction. Is formed. The non-slip mechanism may be a rough surface having a rough surface, or may be a number of small projections or long ribs.

As shown in FIG. 1 and FIG.
Is a ring-shaped band 21 made of an elastic material, for example, rubber.
The band 21a is formed with a hole 9 as a concave portion in the radial direction in the band 21a.

As shown in FIGS. 1, 2 and 4, the holder 3 has a cylindrical main body 23 having a split 28 at one end, and two fastening pieces 24 projecting from the outer periphery of the main body 23 on both sides of the split 28. And a bracket 19 protruding from the main body 23 at an arbitrary position.
9 and a projection 7 protruding at a position opposed to the fastening piece 2.
The bolts 4 and 24 are fastened by the bolts 6 inserted into the bolt holes.

A bolt hole 19a is formed in the bracket 19 of the holder 3, and a guide 17 as shown in FIG.

The main body 23 of the holder 3 is a cylindrical body having a split 28 at one end and a bracket 19 at the other end.
Any adapter can be used as long as it is fitted so as to be wound around the outer periphery of the adapter 21, but may be formed into a structure as shown in FIG.

That is, the adapter 21 is provided on the inner peripheral side of the main body 23.
It is preferable to include a space 25 that is opened downward to be fitted therein, a cylindrical portion 26 that stands at the center of the upper end of the main body 23, and an annular groove 27 that is formed on the outer periphery of the cylindrical portion 26.

In this case, the adapter 23 is inserted into the space 25 by inserting the main body 23 from above or by opening the split 28 and from the side, and the annular groove 27 is formed on the outer periphery of the cylindrical body 26.
And the lower end of the boot 29 for protecting the seal can be attached via the tightening band.

In the present invention, the adapter 21 is inserted and fitted to the outer periphery of the stopper 20 from above in advance, and then the outer tube 10 is attached to the axle bracket 12. Next, the adapter 9 is slightly rotated and finely adjusted so that the hole 9 of the adapter 21 is located on the front side of the fork body. Hole 9
This operation is not necessary if is previously arranged on the front side.

Next, the holder 3 is fitted over the outer periphery of the adapter 21, the projection 7 of the holder 3 is fitted into the hole 9 of the stopper 21, and then the fastening piece 24 is fastened with the bolt 6. And the holder 3 are firmly fixed. After the holder 3 is fixed, the boot 29 is tightened and fixed to the cylindrical portion 26.

In the above case, since the spline 8 is formed on the outer periphery of the stopper 20 so as to prevent slippage, the stopper 20 bites into the spline 8 and does not rotate in the circumferential direction. Further, the holder 3 is tightened by the tightening 24 and does not rotate in the rotation direction because the projection 7 is fitted in the hole 9.

Further, the projection 7 and the bracket 1 which are located at the front side of the fork body in the hole 9 of the
9 is arranged on the front side of the fork main body corresponding to the hole 9, so that the hose or wire 18 attached to the bracket 19 and the mounting guide 17 are accurately arranged on the front side of the fork main body.

[0031]

According to the present invention, the following effects can be obtained.

According to the invention of each claim, since the stopper is provided on the outer periphery of the fork body and the holder is fitted to the stopper via the adapter, the strength of the portion of the stopper is not reduced as compared with the concave groove. Thus, the fork body can be made thinner and lighter. Further, since no concave groove is provided in the fork main body as in the related art, work and equipment for drilling holes are not required in the assembly line, and workability and assemblability are improved.

Similarly, since the stopper is provided with a non-slip outer periphery, the adapter does not rotate, so that the position of the holder fitted on the adapter does not come and go, and the brake hose attached to this holder is always attached to the fork. Can be placed on the front side.

Similarly, a recess is formed on the outer periphery of the adapter, and the protrusion on the inner periphery of the holder is fitted into this recess, so that rotation of the holder with respect to the adapter is prevented. In addition, this concave portion serves as a mark for alignment when the holder is fitted to the stopper, and by positioning this concave portion on the front side of the fork, the bracket protruding from the holder can also be arranged on the front side, so that the hose, etc. Can be reliably positioned on the front side of the fork.

According to the second aspect of the present invention, since the spline is formed as a slip stopper, the rotation of the adapter can be reliably prevented.

According to the third aspect of the present invention, when the adapter is formed of an elastic body such as rubber, when the holder is tightened, the adapter bites into the stopper of the stopper,
The rotation of the holder can be prevented and the tightening and holding force can be improved.

According to the third aspect of the present invention, since the projection is provided at the position facing the bracket, the bracket can be inevitably positioned by adjusting the position of the projection. Etc. are automatically determined.

According to the fourth aspect of the present invention, since the space for fitting the adapter into the holder is formed, the fitting of the holder to the adapter is reliable. Further, since the holder is provided with the cylindrical portion, the holder can be attached with a boot or the like provided on the outer periphery of the fork body.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of a front fork according to the present invention.

FIG. 2 is a perspective view of a holder.

FIG. 3 is an exploded perspective view of a stopper and an adapter.

FIG. 4 is a cross-sectional plan view taken along line AA of FIG.

FIG. 5 is a partial longitudinal front view of a conventional front fork.

[Explanation of symbols]

 3 Holder 7 Projection 8 Spline 9 Hole 10 Outer Tube 11 Inner Tube 17 Guide 18 Hose or Wire 19 Bracket 20 Stopper 21 Adapter 23 Body 24 Tightening Piece 25 Space 26 Cylindrical Part 27 Ring Groove 28 Split

Claims (4)

[Claims] An inner tube is slidably inserted into an outer tube to form a fork main body, and a cylindrical holder is tightened and attached to an arbitrary position on the outer periphery of the fork main body, and is protruded from the outer periphery of the holder. In a front fork in which a guide holding a hose or a wire is attached to a bracket, an annular stopper having a non-slip surface formed on an outer surface of a fork body is formed on a periphery of the fork, and a ring-shaped adapter is fitted on the outer periphery of the stopper. A front fork, wherein a holder is fitted over an outer periphery of an adapter and tightened, and a projection provided on an inner periphery of the holder is fitted into a recess formed on the outer periphery of the adapter. 2. The stopper according to claim 1, wherein the stopper is formed by an annular thick portion formed on an outer periphery of the outer tube, and a non-slip formed of a number of splines is formed on an outer periphery of the thick portion along a circumferential direction. Front fork. 3. A tubular main body, wherein the adapter is formed of a ring-shaped band made of an elastic material, a hole is formed in the band in a radial direction, and a holder has a split at one end.
Fastening pieces protruding from the outer periphery of the body on both sides of the split,
The bracket according to claim 1, further comprising a bracket protruding at an arbitrary position of the main body, and a protrusion protruding from the inner periphery of the main body at a position facing the bracket, and tightening the tightening piece in a state where the protrusion is fitted into the hole of the stopper. Front fork. 4. The holder has a space into which an adapter is fitted on the inner peripheral side of the main body, a cylindrical portion rising at the center of the upper end of the main body, and an annular groove formed on the outer periphery of the cylindrical portion. Front fork.