CN102381419B

CN102381419B - Front fork

Info

Publication number: CN102381419B
Application number: CN201110184624.XA
Authority: CN
Inventors: 三轮和宏; 永井修
Original assignee: Showa Corp
Current assignee: Hitachi Astemo Ltd
Priority date: 2010-08-30
Filing date: 2011-06-28
Publication date: 2016-03-02
Anticipated expiration: 2031-06-28
Also published as: CN102381419A

Abstract

In front fork (10), the fastening bolt (90) snapped in from outside axle shank (14) in the base (80) linked along direction of principal axis and the bottom of the axletree side pipe (12) be under temporary fixing state, by axletree side pipe (12) to axle shank (14) tractive, thus, under top end face (A) in the bottom of axletree side pipe (12) does not rush with the bottom surface (B) of the recess (15) of axle shank (14) state connect, be formed in the assembled state of the contact part generation surface pressure of two flat of threads of the outer screw section (71) of axletree side pipe (12) and the female threaded portion (72) of axle shank (14).

Description

Front fork

Corresponding Japanese publication: application numbers: Japanese Patent Application 2010-192544 (H22-08-30 application)

Application numbers: Japanese Patent Application 2010-255808 (H22-11-16 application)

Application numbers: Japanese Patent Application 2011-021159 (H23-02-02 application)

Technical field

The present invention relates to a kind of front fork.

Background technology

In the inverted front forks such as automatic two-wheeled cycle, axletree side pipe inserts in car body side pipe in the mode that can slide, and between car body side pipe and axletree side pipe, axle spring is housed, and the bottom of axletree side pipe is inserted and secured in the recess of axle shank.

Figure 17 represents the front fork described in Japanese Patent Publication 8-8361 (patent documentation 1), make the outer screw section on the periphery of the bottom being arranged at axletree side pipe 1 be arranged at axle shank 2 recess 2 inner circumferential on female threaded portion be spirally connected.The bottom surface of the recess of the top end face of the bottom of axletree side pipe 1 and axle shank 2 (or the spring leaf 3 on bottom surface) is rushed connect, so, be fastenedly connected the outer screw section of axletree side pipe 1 and the female threaded portion of axle shank 2, at the contact part generation surface pressure of two flat of threads, thus axle tree side pipe 1 and axle shank 2.

Figure 18 represents the front fork that Japanese Patent 4198579 (patent documentation 2) is recorded, in the base 4 linked along the bottom of direction of principal axis and axletree side pipe 1, be spirally connected the bolt 5 snapped in from outside axle shank 2, by axletree side pipe 1 to axle shank 2 tractive.Further, the bottom surface of the recess of the top end face of the bottom of axletree side pipe 1 and axle shank 2 is rushed and connects, axletree side pipe 1 and axle shank 2 are fixed.

Generally, in front fork, because of the damage of axletree side pipe 1 or axle shank 2, change these axletree side pipes 1 or axle shank 2, or when changing the axle spring 6 of the inside of axletree side pipe 1, axletree side pipe 1 and axle shank 2 must be decomposed, then assemble.

But, in the front fork that patent documentation 1 is recorded, be fastenedly connected with the female threaded portion of the wider contact part of two flat of threads by the outer screw section of axletree side pipe 1 and axle shank 2, the assembling rigidity of axletree side pipe 1 and axle shank 2 can be improved.But, owing to being that screw threads for fastening connects axletree side pipe 1 and axle shank 2, therefore, in order to axletree side pipe 1 and axle shank 2 are decomposed and assembled, just need the large-scale special tool holding axletree side pipe 1 and axle shank 2 respectively.Particularly for the outside face of axletree side pipe 1 of oil sealing moving contact of peristome being arranged on car body side pipe, do not allow to occur damage, need not to it with causing damage the special tool holding axletree side pipe 1, thus cost is higher.

In the front fork described in patent documentation 1, the piston rod being installed on the upper end of car body side pipe is inserted the inside of axletree side pipe 1 from the partition wall member of upper end being arranged at axletree side pipe 1 in the mode slid freely, in the piston of the top ends of this piston rod, be equipped with attenuation power generating means.In addition, in the inside of axletree side pipe 1, the lower surface of piston and be arranged at axletree side pipe 1 bottom base upper surface between axle spring 6 is housed.Now, when the build-in components of the axletree side pipe 1 of repair and replacement axle spring 6 and attenuation power generating means etc., easily can not pull down the axle shank 2 of the bottom being connected to axletree side pipe 1 with high rigidity by screw threads for fastening, therefore, cannot from these build-in components of axle side repair and replacement.Therefore, must be connected in the partition wall member of the upper end of axletree side pipe 1 with screw threads for fastening in the mode that can pull down, from these build-in components of car body side repair and replacement, cost is higher.

On the other hand, in the front fork that patent documentation 2 is recorded, use general purpose tool installing/dismounting bolt 4 in base 4, just can easily axletree side pipe 1 and axle shank 2 be decomposed and assemble thus.But axletree side pipe 1 and axle shank 2 rush by means of only the top end face of the bottom of axletree side pipe 1 and the bottom surface of the recess of axle shank 2 that the narrow and small contact surface connect is fastened to be connected, and the assembling rigidity of axletree side pipe 1 and axle shank 2 is lower.

Summary of the invention

Problem of the present invention is, easily and with high rigid group entrucking axle side pipe and axle shank in front fork.

Invention described in technical scheme 1, axletree side pipe inserts in car body side pipe in the mode that can slide, between car body side pipe and axletree side pipe, axle spring is housed, the bottom of axletree side pipe is inserted into and is fixed in the recess of axle shank, in the front fork formed like this, by inserting the fastening device in axle shank from outside, be formed in outer screw section on the periphery of the bottom being arranged at axletree side pipe be arranged at axle shank recess inner circumferential on female threaded portion two flat of threads contact part on there is the assembled state of surface pressure.

Invention described in technical scheme 2, axletree side pipe inserts in car body side pipe in the mode that can slide, between car body side pipe and axletree side pipe, axle spring is housed, the bottom of axletree side pipe is inserted into and is fixed in the recess of axle shank, in the front fork formed like this, make the outer screw section on the periphery of the bottom being arranged at axletree side pipe be arranged at axle shank recess inner circumferential on female threaded portion be spirally connected, being formed thus makes the top end face of the bottom of axletree side pipe leave from the bottom surface of the recess of axle shank, the temporary fixing state of surface pressure can not be there is on the contact part of two flat of threads of the described female threaded portion of the described outer screw section of axletree side pipe and described axle shank, the fastening bolt snapped in from outside axle shank in the base linked along direction of principal axis and the bottom of the axletree side pipe be under temporary fixing state, by axletree side pipe to axle shank tractive, thus, under making the top end face of the bottom of axletree side pipe not rush with the bottom surface of the recess of axle shank the state connect, be formed in the assembled state of the contact part generation surface pressure of two flat of threads of the described outer screw section of axletree side pipe and the described female threaded portion of axle shank.

Invention described in technical scheme 3, in the invention described in technical scheme 2, the elastic body between the bottom surface being also provided with the top end face of the bottom being sandwiched in axletree side pipe under described temporary fixing state and the recess of axle shank.

Invention described in technical scheme 4, in the invention described in technical scheme 2 or 3, described base also has the detent engaged with the rotation retainer be arranged on axle shank.

Invention described in technical scheme 5, axletree side pipe inserts in car body side pipe in the mode that can slide, between car body side pipe and axletree side pipe, axle spring is housed, the bottom of axletree side pipe is inserted into and is fixed in the recess of axle shank, in the front fork formed like this, there is the center shaft around this axletree side pipe and shape all-in-one-piece guard ring in the bottom of axletree side pipe, utilize the fastening device inserted axle shank from outside that guard ring is rotated, make the outer screw section on the periphery of the bottom being arranged at the axletree side pipe rotated integrally with guard ring be arranged at axle shank recess inner circumferential on female threaded portion screw togather, the bottom surface side blow of the top end face of the bottom of axletree side pipe and the recess of axle shank is connect, thus, the bottom of axletree side pipe is just fastened in the recess of axle shank.

Invention described in technical scheme 6, in the invention described in technical scheme 5, described guard ring also have be sandwiched in the bottom of axletree side pipe and the recess of axle shank bottom surface between, around the engagement section that the center shaft of this axletree inner tube of a tyre engages with the engaged part of the bottom being arranged at axletree side pipe, guard ring rotates by these engagement sections and engaging of engaged part integratedly with axletree side pipe.

Invention described in technical scheme 7, in the invention described in technical scheme 6, is provided with the engaged part of breach channel-shaped, is provided with the engagement section of overshooting shape in the periphery of described guard ring at the top end face of the bottom of described axletree side pipe.

Invention described in technical scheme 8, in the invention described in technical scheme 6 or 7, when the bottom of described axletree side pipe is fastened in the recess of axle shank, elastic body is sandwiched between the bottom surface of the recess of guard ring and axle shank.

Invention described in technical scheme 9, in the invention described in technical scheme 5, the inner circumferential of the bottom of guard ring and axletree side pipe is screwed and forms one.

Invention described in technical scheme 10, in the invention described in technical scheme 9, the rotation direction being screwed the ridge of described guard ring and axletree side pipe is opposite sense with the rotation direction of the ridge being screwed axletree side pipe and axle shank.

Invention described in technical scheme 11, in the invention described in technical scheme 9 or 10, described guard ring has and abuts with the end face of the bottom of axletree side pipe, and is landed in the flange on the bottom surface of the recess of axle shank.

Invention described in technical scheme 12, in the invention described in any one in technical scheme 5 ~ 11, described fastening device inserts from the handle hole offered at axle shank, by with the engaging of the connecting hole be arranged on guard ring, this guard ring is rotated.

Invention described in technical scheme 13, in invention described in any one in technical scheme 5 ~ 12, when the bottom of described axletree side pipe is fastened in the recess of axle shank, between the top end face of the bottom of axletree side pipe and the bottom surface of the recess of axle shank, pad is housed.

According to the present invention, there is following action effect.

(technical scheme 1,2)

(a) under the assembled state of axletree side pipe and axle shank, by bolted in the base and by axletree side pipe to axle shank tractive, thus, the outer screw section of axletree side pipe contacts with two flat of threads of the female threaded portion of axle shank.Now, the top end face of the bottom of axletree side pipe does not rush with the bottom surface of the recess of axle shank and connects, and therefore, the flat of thread of the outer screw section of axletree side pipe is subject to the effect of roughly all traction forces of bolt, is close on the flat of thread of the female threaded portion of axle shank.There is larger surface pressure in the wider longer contact part that circumferencial direction and the direction of principal axis of these two flat of threads extend, can with high rigid group entrucking axle side pipe and axle shank.

In addition, under the temporary fixing state of the outer screw section of axletree side pipe and the female threaded portion of axle shank, the top end face of the bottom of axletree side pipe is made not rush ground connection leaving with the bottom surface of the recess of axle shank.In contrast, under temporary fixing state, when the bottom surface of the top end face of the bottom of axletree side pipe and the recess of axle shank touch and rush connect, the outer screw section of axletree side pipe applies upwards load on the female threaded portion of axle shank.In this condition, by bolted on base, when making axletree side pipe and axle shank be in assembled state, be pulled down by the outer screw section of base to the axletree side pipe of axle shank tractive.In the case, under the assembled state of axletree side pipe and axle shank, the above-mentioned load upwards that the outer screw section of axletree side pipe applies in advance under prior temporary fixing state on the female threaded portion of axle shank will reduce, the surface pressure of the flat of thread of two threaded portions reduces, and the assembling rigidity of axletree side pipe and axle shank will decline.

If b () uses general purpose tool to be pulled down from base by bolt, the temporary fixing state that the surface pressure then becoming the contact part of two flat of threads of the outer screw section of axletree side pipe and the female threaded portion of axle shank disappears, manually the mode such as rotation easily can rotate and decompose axletree side pipe and axle shank.

In addition, after manually axletree side pipe and axle shank are become temporary fixing state by the mode such as fastening, use general purpose tool by bolted on base, thus can easily axletree side pipe be re-assemblied on axle shank.

(technical scheme 3)

C () is provided with the elastic body between the bottom surface being sandwiched in the top end face of the bottom of axletree side pipe and the recess of axle shank under the temporary fixing state of above-mentioned (b).Therefore, in the process of manual fastening axletree side pipe and axle shank, the top end face of the bottom of axletree side pipe can be touched elastomeric position and take that axletree side pipe and axle shank are configured to the position of the temporary fixing state of above-mentioned (b) as.Do not need connect axletree side pipe and axle shank are rushed and be set to that the size of temporary fixing state manages, the assembleability of axletree side pipe and axle shank can be improved.

(technical scheme 4)

D () base is equipped with the detent engaged with the retainer be arranged on axle shank.Therefore, in above-mentioned (b), when by bolted in the base time, base is blocked for rotation relative to axle shank.Base can not link with the rotation of bolt and rotate, and can improve the assembleability of axletree side pipe and axle shank.

(technical scheme 5)

E () has center shaft around this axletree side pipe and shape all-in-one-piece guard ring in the bottom of axletree side pipe.When assembling axletree side pipe and axle shank, utilize the fastening device inserted axle shank from outside that guard ring is rotated, make the outer screw section on the periphery of the bottom being arranged at the axletree side pipe rotated integratedly with guard ring be arranged at axle shank recess inner circumferential on female threaded portion screw togather, the bottom surface side of the top end face of the bottom of axletree side pipe and the recess of axle shank (pad on bottom surface or bottom surface) is rushed connect, thus, the bottom of axletree side pipe is just fastened in the recess of axle shank.There is surface pressure in the wider contact part of two flat of threads of the outer screw section of axletree side pipe and the female threaded portion of axle shank, axletree side pipe and axle shank can be rigidly fixed with height.

If f () utilizes fastening device to make guard ring reverse, the temporary fixing state that the surface pressure then becoming the contact part of two flat of threads of the outer screw section of axletree side pipe and the female threaded portion of axle shank disappears, manually the mode such as rotation easily can be rotated and decompose axletree side pipe and axle shank.

In addition, after manually axletree side pipe and axle shank are in temporary fixing state by the method such as fastening, if utilize fastening device to make guard ring rotate, then can easily axletree side pipe be re-assemblied on axle shank.

G () is in order to be fixed on axle shank by axletree side pipe, the outside face being at least inserted into the reservations of car body side pipe of axletree side pipe need not be held, therefore, damage can not be caused to the outside face of moving contact axletree side pipe of oil sealing with the peristome being arranged at car body side pipe, can guaranteed quality.Therefore, it is possible to share on manufacturing line car body side pipe being inserted the just vertical front fork in axletree side pipe in the mode that can slide.

(h) owing to can easily decomposing from the bottom of axletree side pipe and pull down axle shank, therefore, it is possible to from the build-in components of the axletree side pipes such as axle side repair and replacement axle spring and attenuation power generating means.Like this, can not only the upper end of axletree side pipe be arranged at and the partition wall member riveted joint being inserted with piston rod is fixed on the upper end of axletree side pipe, and can reduce costs.

(technical scheme 6)

I () guard ring is sandwiched between the bottom surface of the bottom of axletree side pipe and the recess of axle shank, be equipped with the engagement section that the center shaft around this axletree side pipe engages with the engaged part of the bottom being arranged at axletree side pipe.Therefore, when utilizing that the fastening device snapped in axle shank makes guard ring rotate from outside, guard ring and axletree side pipe by these engagement sections and engaged part engagement and rotate integratedly.

(technical scheme 7)

J () is provided with the engaged part of breach channel-shaped on the top end face of the bottom of above-mentioned axletree side pipe, be provided with the engagement section of overshooting shape in the periphery of the guard ring of above-mentioned (i).Engaged part and engagement section can be formed easily.

(technical scheme 8)

K (), when the bottom of aforementioned axle side pipe is fastened in the recess of axle shank, elastic body is sandwiched between the bottom surface of the guard ring of above-mentioned (i) and the recess of axle shank.After use guard ring assembling axletree side pipe and axle shank, rocking of guard ring can be prevented.

(technical scheme 9)

L the inner circumferential of the bottom of () guard ring and axletree side pipe is screwed (J) and forms one.Therefore, when utilizing the fastening device inserted axle shank from outside to make guard ring rotate, guard ring is screwed J by above-mentioned and rotated integratedly.

(technical scheme 10)

The rotation direction of the guard ring that m () is screwed (J) above-mentioned (l) and the ridge of axletree side pipe is opposite sense with the rotation direction of the ridge being screwed (K) axletree side pipe and axle shank.Therefore, when utilization makes guard ring rotate from the outside fastening device inserted axle shank, guard ring is rotated integratedly by the above-mentioned J of being screwed, and the outer screw section of the periphery of the axletree side pipe rotated integratedly with this guard ring is reliably screwed togather with the female threaded portion of the inner circumferential of axle shank by the above-mentioned K of being screwed.

(technical scheme 11)

N the guard ring of () above-mentioned (l) is equipped with and abuts with the end face of the bottom of axletree side pipe, and be landed in the flange on the bottom surface of the recess of axle shank.Thus, the top end face of the bottom of axletree side pipe is by the flange with its shape all-in-one-piece guard ring, and rush with the bottom surface of the recess of axle shank and connect, the bottom of axletree side pipe is fastened in the recess of axle shank.

(technical scheme 12)

O () above-mentioned fastening device inserts from the handle hole be opened in axle shank, by with the engaging of the connecting hole be arranged on guard ring, this guard ring is rotated.Can form easily and utilize fastening device to rotate the rotary manipulation structure of guard ring.

(technical scheme 13)

P (), when the bottom of above-mentioned axletree side pipe is fastened in the recess of axle shank, is equipped with pad between the top end face of the bottom of axletree side pipe and the bottom surface of the recess of axle shank.Adopt at axletree side pipe the hard materials such as iron to form, when axle shank adopts the soft materials such as aluminum alloy to form, can axle shank be protected.

Accompanying drawing explanation

Fig. 1 is the section drawing of the entirety of the front fork representing embodiment 1.

Fig. 2 is the lower section figure of Fig. 1.

Fig. 3 is the pars intermedia section drawing of Fig. 1.

Fig. 4 is the top section drawing of Fig. 1.

Fig. 5 is the section drawing representing attenuation power generating means.

Fig. 6 is the section drawing of VI-VI line along Fig. 2.

Fig. 7 represents base, and (A) is front view, and (B) is section drawing, and (C) is upward view.

Fig. 8 is the section drawing of the entirety of the front fork representing embodiment 2.

Fig. 9 is the lower section figure of Fig. 8.

Figure 10 is the pars intermedia section drawing of Fig. 8.

Figure 11 is the top section drawing of Fig. 8.

Figure 12 is the section drawing representing attenuation power generating means.

Figure 13 is the exploded perspective view of the main portion of Fig. 9.

Figure 14 is the section drawing of the front fork representing embodiment 3.

Figure 15 is the amplification sectional view of the main portion of Figure 14.

Figure 16 is the block diagram of exploded representation front fork.

Figure 17 is the section drawing representing conventional example.

Figure 18 is the section drawing representing conventional example.

Detailed description of the invention

(embodiment 1) (Fig. 1 ~ Fig. 7)

As shown in Figure 1 to 4, front fork (oleo gear 10 by be fixed on car body side pipe 11 lower ending opening portion inner circumferential on sleeve pipe 11A and be fixed on axletree side pipe 12 upper end open portion periphery on sleeve pipe 12A, seal ring 12B, in the mode slid freely, axletree side pipe 12 is inserted the inside of car body side pipe 11.The lower container of the sleeve pipe 11A in the lower ending opening portion of car body side pipe 11 has oil sealing 11B, dust ring 11C.Fork bolt 13 is spirally connected with the upper end open portion of car body side pipe 11 in sealed states.As described later, the bottom of axletree side pipe 12 is inserted and secured in the elongate pocket 15 of the ring-type of axle shank 14.

The ring-type grease chamber 20 that front fork 10 marks off the inner circumferential of car body side pipe 11, the periphery of axletree side pipe 12 and surrounded by aforementioned two sleeve pipes 11A, 12A.

Cylindrical body 31 is inserted the inner circumferential of front fork 10 in the upper end side of axletree side pipe 12, utilize the upper end caulking part 12C of axletree side pipe 12 to rivet and fix this cylindrical body 31.Insert band upper annular plate axle sleeve 32 (being equipped with upper annular plate 33) and lower annular plate 34 successively in the lower end inner circumferential of cylindrical body 31, utilize the lower end caulking part 31A of cylindrical body 31 to rivet and keep them.Cylindrical body 31, band upper annular plate axle sleeve 32 and lower annular plate 34 form the partition wall member 30 being arranged at the inner circumferential of axletree side pipe 12, and the bottom of next door parts 30 marks off grease chamber 21, and marks off oil cabinet 22 on top.In oil cabinet 22, its underside area is grease chamber 22A, and upper-side area is energy chamber 22B.

In front fork 10, the upper surface of piston rod 40 is made to contact the medial surface be arranged on the center shaft of the fork bolt 13 of the upper end of car body side pipe 11, be spirally connected from the hollow threaded portion of the bolt 40A the through hole of outside insertion fork bolt 13 and piston rod 40, with tractive piston rod 40, piston rod 40 is arranged on fork bolt 13.

In front fork 10, the piston rod 40 be arranged on the fork bolt 13 of car body side pipe 11 is inserted the inside of axletree side pipe 12 in the mode slid freely from partition wall member 30.The piston 41 with the inner circumferential moving contact of axletree side pipe 12 is equipped with in the top ends of the piston rod 40 be inserted in axletree side pipe 12.The bolt 42 be spirally connected with the top end face of piston rod 40 is inserted into the centre hole portion of piston 41, piston 41 is fixed on the top ends of piston rod 40.In the periphery of piston 41, piston ring 41A is set.The inside grease chamber 21 of axletree side pipe 12 is divided into by the piston 41 of piston rod 40: receive the piston rod side grease chamber 21A of piston rod 40, do not receive the piston side grease chamber 21B of piston rod 40.

Aforementioned cyclic grease chamber 20, by being arranged at the oilhole 20A in axletree side pipe 12, is communicated with piston rod side grease chamber 21A by front fork 10.

In front fork 10, in the inside of axletree side pipe 12, piston 41 in the face of piston side grease chamber 21B lower surface and be arranged at as described later axletree side pipe 12 bottom base 80 in the face of piston side grease chamber 21B upper surface between load axle spring 43.Front fork 10 utilizes the flexible of axle spring 43 to absorb the impulsive force born from road surface when vehicle travels better.

Front fork 10 is equipped with attenuation power generating means 50 in piston 41.Attenuation power generating means 50 as shown in Figure 5, has the elongation compression common-use tunnel 51 that can be communicated with piston rod side grease chamber 21A and piston side grease chamber 21B in piston 41.In piston 41, setting up the disc valve 52 (hole 52A) with holes extending compression common-use tunnel 51 for opening and closing in the face of the end face (valve seat) of piston rod side grease chamber 21A, utilizing valve spring 53, valve drg 54 supporting this disc valve 52.That is, when utilizing bolt 42 to be fixed on the top end face of piston rod 40 by piston 41, between the top end face and the upper surface of piston 41 of piston rod 40, disc valve 52, valve spring 53 and valve drg 54 is clamped with.

Attenuation power generating means 50 is in extended travel, and the high pressure oil of piston rod side grease chamber 21A is sent to piston side grease chamber 21B by the hole 52A of disc valve 52 with elongation compression common-use tunnel 51, produces the elongation attenuation power caused because of the channel resistance of hole 52A.In compression stroke, the high pressure oil of piston side grease chamber 21B acts on disc valve 52 from elongation compression common-use tunnel 51, lifting disc valve 52 from the upper surface of piston 41 and then entered piston rod side grease chamber 21A by force feed, producing the compression attenuation power caused by channel resistance in the gap because being formed between disc valve 52 and the upper surface of piston 41.

In front fork 10, the periphery, upper end around piston rod 40 configures the drg rubber 44 abutted with the lower surface of fork bolt 13, makes the pad 46 supported by the Sealing shield ring 45 of the periphery, upper end being locked on piston rod 40 be crimped on the lower surface of drg rubber 44.When the maximum compression of front fork 10, the upper end caulking part 12C of axletree side pipe 12 impacts by pad 46 and drg rubber 44 and combines, and limits maximum compression stroke thus.

In front fork 10, hold the lower end periphery around piston rod 40 at the upper surface of valve drg 54 and the bounce-back spring 47 configured.During the maximum elongation of front fork 10, partition wall member 30 impacts with bounce-back spring 47 and combines, restriction maximum elongation stroke thus.

But in front fork 10, as shown in Figure 3, the sectional area S1 of the above-mentioned ring-type grease chamber 20 be made up of the annular slot of car body side pipe 11 and axletree side pipe 12 is formed as being more than or equal to the sectional area of piston rod 40 (external diameter around area) S2.

Partition wall member 30 is provided with next door check valve 60.For next door check valve 60, (A) in extended travel, micro gap passage is formed, for by the oil in remaining grease chamber 21 is discharged from piston rod side grease chamber 21A to oil cabinet 22 because of the sectional area S1 of ring-type the grease chamber 20 and difference Δ S of the sectional area S2 of piston rod 40 around piston rod 40; (B) in compression stroke, formed and supplement passage, for by the oil of deficiency supplements to grease chamber 21 from oil cabinet 22 because of the sectional area S1 of ring-type the grease chamber 20 and difference Δ S of the sectional area S2 of piston rod 40.

As shown in Figure 3, next door check valve 60 is accommodated between the upper annular plate 33 of partition wall member 30 and lower annular plate 34, shorter than the interval between upper annular plate 33 and lower annular plate 34, form the external diameter less than the internal diameter of axle sleeve 32, be formed as the cylindrical shape that upper and lower displacement is carried out in gap small between the periphery by piston rod 40, form translot 61 in lower surface.The valve spring 62 be made up of compression coil spring is housed between next door check valve 60 and lower annular plate 34, and upwards annular plate 33 side applies elastic force.In compression stroke, link with the piston rod 40 entering axletree side pipe 12 and move downwards, press with lower annular plate 34 and combine, and form gap between itself and upper annular plate 33, the oil of oil cabinet 22 can be supplemented via its periphery from translot 61 to piston rod side grease chamber 21A.

Front fork 10 action in the following way.

(compression stroke)

Car body side pipe 11 enters axletree side pipe 12, by with the car body side pipe 11 together piston 41 of movement and the oil of the piston side grease chamber 21B be retracted becomes high pressure, as previously mentioned, disc valve 52 is opened, and is entered piston rod side grease chamber 21A by force feed, result, as mentioned above, compression attenuation power is produced.

In this compression stroke, due to the difference Δ S of the sectional area S1 of ring-type the grease chamber 20 and sectional area S2 of piston rod 40, should supplement and be added to piston rod side grease chamber 21A via next door check valve 60 from oil cabinet 22 to the oil of the magnitude of recruitment of ring-type grease chamber 20.

(extended travel)

Car body side pipe 11 exits from axletree side pipe 12, by with the car body side pipe 11 together piston 41 of movement and the oil of the piston rod side grease chamber 21A be retracted becomes high pressure, entered piston side grease chamber 21B through the hole 52A of disc valve 52 by force feed, result, as previously mentioned, stretching attenuation power is produced.

In this extended travel, due to the difference Δ S of the sectional area S1 of ring-type the grease chamber 20 and sectional area S2 of piston rod 40, the oil of the discharge rate should discharged from ring-type grease chamber 20 is discharged to oil cabinet 22 from piston rod side grease chamber 21A via next door check valve 60.

But, in front fork 10, in order to easily and with high rigid group entrucking side pipe 11 and axletree side pipe 12, according to the method described in following (1), (2), the bottom of axletree side pipe 12 can be inserted and be fixed in the recess 15 of axle shank 14.

Herein, axletree side pipe 12 is provided with outer screw section 71 in the periphery of bottom.In addition, base 80 is loaded in the internal diameter of the bottom of axletree side pipe 12 with sealing state by O shape ring 81.In base 80, the Sealing shield ring 82 of endless groove of internal diameter of the path end difference being located at lower end side periphery from top with the bottom being locked on axletree side pipe 12 engages, and thus, links in the bottom of direction of principal axis and axletree side pipe 12.The upper surface of base 80 is the seat surface of axle spring 43.

Axle shank 14 has the elongate pocket 15 of the suitable degree of depth of the equivalent length scope of the bottom can inserting axletree side pipe 12, is provided with female threaded portion 72 in the inner circumferential of this recess 15.Its bottom surface is through to from outside in the bolt hole 14A of axle shank 14 on the center shaft being arranged at recess 15, can by the bolt 90 snapping in this bolt hole 14A from outside and the screw hole of lower surface being opened in base 80.The head of bolt 90 is locked on the large footpath cascaded surface of bolt hole 14A from axial foreign side.

As shown in Figure 6, axle shank 14 has the cross-drilled hole 14B intersected with a part for the inner circumferential of recess 15, be inserted into a part for the periphery of the drg bolt 16 in this cross-drilled hole 14B to engage with a part of the endless groove 12D on the periphery being arranged on axletree side pipe 12, stop axletree side pipe 12 to depart from from axle shank 14.The outer screw section 71 of axletree side pipe 12 is arranged near its top end face A compared with endless groove 12D, and the female threaded portion 72 of axle shank 14 is arranged near the B of bottom surface compared with cross-drilled hole 14B.

(1) manually the mode such as fastening by the outer screw section 71 be arranged on the periphery of the bottom of axletree side pipe 12 be arranged at axle shank 14 recess 15 inner circumferential on female threaded portion 72 be spirally connected, and temporarily to fix.

Now, realize following temporarily fixing state, namely, the top end face A of the bottom of axletree side pipe 12 is left by the bottom surface B of gap from the recess 15 of axle side support 14, can not at the contact part generation surface pressure of two flat of threads of the female threaded portion 72 of the outer screw section 71 of axletree side pipe 12 and axle shank 14.Make the above-mentioned temporary fixing state that the top end face A of axletree side pipe 12 leaves from the bottom surface B of axle shank 14, manage according to the manual fastening situation such as fastening.

(2) in the tapped bore of the base 80 linked with the bottom of the axletree side pipe 12 under the temporary fixing state being in above-mentioned (1) along direction of principal axis, the fastening bolt 90 snapped in from outside axle shank 14, also final fixing to axle shank 14 tractive axletree side pipe 12.

Finally fix according to this, under making the top end face A of the bottom of axletree side pipe 12 not rush with the bottom surface B of the recess 15 of axle shank 14 state connect, obtain a kind of assembled state that surface pressure occurs on the contact part of two flat of threads of the outer screw section 71 of axletree side pipe 12 and the female threaded portion 72 of axle shank 14.

In order to not need the temporary fixing state of the fastening situation such as manually fastening managed based on above-mentioned (1), elastic body 83 (such as rubber, resin etc.) (Fig. 2 (B)) can be set on the bottom surface B of the recess 15 of axle shank 14.Under the temporarily fixing state of above-mentioned (1) that the outer screw section 71 of axletree side pipe 12 is spirally connected with the female threaded portion 72 of axle shank 14, elastic body 83 contacts with the top end face A of the bottom of axletree side pipe 12 with the both sides of the bottom surface B of the recess 15 of axle shank 14 and is sandwiched between them.

In above-mentioned (2), time in tapped bore bolt 90 being fastened on base 80, rotate to reliably prevent base 80 and bolt 90 from linking, can along the bottom surface B concavo-convex engaging of the hand of rotation of bolt 90 by the top end face A of base 80 and the recess 15 of axle shank 14.That is, as shown in Figure 6, Figure 7, in the top end face A of base 80, raised line detent K is set in the both sides clipping tapped bore, in the bottom surface B of the recess 15 of axle shank 14, concavity is set in the both sides clipping bolt hole 14A and rotates retainer L.When by the bottom of axletree side pipe 12 insert axle shank 14 recess 15 in time, be filled into the detent K of the base 80 of the internal diameter of the bottom of axletree side pipe 12 to engage with the rotation retainer L of the recess 15 of axle shank 14, prevent the above-mentioned interlock of base 80 from rotating.

According to the present embodiment, there is following action effect.

A () is under the assembled state of axletree side pipe 12 and axle shank 14, bolt 90 is fastened on base 80, by axletree side pipe 12 to axle shank 14 tractive, thus, two flat of threads of the outer screw section 71 of axletree side pipe 12 and the female threaded portion 72 of axle shank 14 only contact with each other spiral shell.Now, the top end face A of the bottom of axletree side pipe 12 does not rush with the bottom surface B of the recess 15 of axle shank 14 and connects, therefore, the flat of thread of the outer screw section 71 of axletree side pipe 12 is subject to the effect of roughly all traction forces of bolt 90 and is close on the flat of thread of female threaded portion 72 of axle shank 14.The wider longer contact part that circumferencial direction and the direction of principal axis of these two flat of threads extend produces larger surface pressure, can with high rigid group entrucking axle side pipe 12 and axle shank 14.

In addition, under the temporarily fixing state of the outer screw section 71 of axletree side pipe 12 and the female threaded portion 72 of axle shank 14, the top end face A of the bottom of axletree side pipe 12 does not rush with the bottom surface B of the recess 15 of axle shank 14 and connects, but leaves.In contrast, under temporary fixing state, the bottom surface B of the top end face A of the bottom of axletree side pipe 12 and the recess 15 of axle shank 14 touches and rushes when connecing, and the outer screw section 71 of axletree side pipe 12 applies upwards load on the female threaded portion 72 of axle shank 14.If in this condition, bolt 90 is fastened on base 80, makes axletree side pipe 12 and axle shank 14 become assembled state, be then pulled down by the outer screw section 71 of the axletree side pipe 12 to axle shank 14 tractive by base 80.In the case, under the assembled state of axletree side pipe 12 and axle shank 14, the above-mentioned load upwards that the outer screw section 71 of axletree side pipe 12 applies in advance under prior temporary fixing state on the female threaded portion 72 of axle shank 14 is reduced, the surface pressure of the flat of thread of two threaded portions 71,72 reduces, and the assembling rigidity of axletree side pipe 12 and axle shank 14 can decline.

If b () uses general purpose tool to be pulled down from base 80 by bolt 90, the temporary fixing state that the surface pressure then becoming the contact part of two flat of threads of the outer screw section 71 of axletree side pipe 12 and the female threaded portion 72 of axle shank 14 disappears, manually the mode such as rotation can easily be moved and decompose axletree side pipe 12 and axle shank 14 by spiral shell.

In addition, after the state that axletree side pipe 12 and axle shank 14 to be become temporarily fixing by the manually method such as fastening, use general purpose tool to be fastened on base 80 by bolt 90, thus can easily axletree side pipe 12 be re-assemblied on axle shank 14.

C () is sandwiched in the elastic body 83 between the bottom surface B of the top end face A of the bottom of axletree side pipe 12 and the recess 15 of axle shank 14 under being arranged on the temporary fixing state of above-mentioned (b).Therefore, in the process of manual fastening axletree side pipe 12 and axle shank 14, the position top end face A of the bottom of axletree side pipe 12 can being touched elastic body 83 take that axletree side pipe 12 and axle shank 14 are configured to the position of the temporary fixing state of above-mentioned (b) as.Do not need, to for axletree side pipe 12 and axle shank 14 being spirally connected and being set to that the size of temporary fixing state manages, the assembleability of axletree side pipe 12 and axle shank 14 can be improved.

D () base 80 has the detent K engaged with the rotation retainer L be arranged on axle shank 14.Therefore, in above-mentioned (b), when being fastened in base 80 by bolt 90, base 80 is prevented from relative to the rotation of axle shank 14.Base 80 can not link with the rotation of bolt 90 and rotate, and can improve the assembleability of axletree side pipe 12 and axle shank 14.

Above, illustrating in detail embodiments of the invention with reference to the accompanying drawings, concrete structure of the present invention is not limited to this embodiment, and the design modification etc. not departing from the scope of aim of the present invention is also contained in the present invention.

(embodiment 2) (Fig. 8 ~ Figure 13)

As shown in Fig. 8 ~ Figure 11, front fork (oleo gear) 110 is the sleeve pipe 112A on the periphery in sleeve pipe 111A in the inner circumferential in lower ending opening portion by being fixed on car body side pipe 111 and the upper end open portion being fixed on axletree side pipe 112, in the mode slid freely, axletree side pipe 112 is inserted in the inverted of the inside of car body side pipe 111.Oil sealing 111B, dust ring 111C is had in the lower container of the sleeve pipe 111A in the lower ending opening portion of car body side pipe 111.Fork bolt 113 is spirally connected with the upper end open portion of sealing state and car body side pipe 111.As described later, the bottom of axletree side pipe 112 is inserted in the elongate pocket 115 of the ring-type being fixed on axle shank 114.

The ring-type grease chamber 120 that front fork 110 is divided into the inner circumferential of car body side pipe 111, the periphery of axletree side pipe 112 and is surrounded by aforementioned two sleeve pipes 111A, 112A.

In front fork 110, insert cylindrical body 131 by the inner circumferential of the upper end side at axletree side pipe 112, utilize the upper end caulking part 112C of axletree side pipe 112 to rivet and fix this cylindrical body 131.Insert band upper annular plate axle sleeve 132 (there is upper annular plate 133), lower annular plate 134 successively in the lower end inner circumferential of cylindrical body 131, utilize the lower end caulking part 131A of cylindrical body 131 to rivet and keep them.Cylindrical body 131, band upper annular plate axle sleeve 132 and lower annular plate 134 form the partition wall member 130 being arranged at the inner circumferential of axletree side pipe 112, and the bottom of next door parts 130 marks off grease chamber 121, and marks off oil cabinet 122 on top.In oil cabinet 122, its underside area is grease chamber 122A, and upper-side area is energy chamber 122B.

In front fork 110, make the upper surface of piston rod 140 be arranged at car body side pipe 111 upper end fork bolt 113 center shaft on medial surface abut, be spirally connected with tractive piston rod 140 from the hollow female threaded portion of the bolt 140A the through hole of outside insertion fork bolt 113 and piston rod 140, thus piston rod 140 is arranged on fork bolt 113.

In front fork 110, the piston rod 140 be arranged on the fork bolt 113 of car body side pipe 111 is inserted the inside of axletree side pipe 112 in the mode slid freely from partition wall member 130.In the top ends of the piston rod 140 be inserted in axletree side pipe 112, there is the piston 141 with the inner circumferential moving contact of axletree side pipe 112.The bolt 142 be spirally connected with the top end face of piston rod 140 is inserted into the centre hole portion of piston 141, piston 141 is fixed on the top ends of piston rod 140.In the periphery of piston 141, piston ring 141A is set.The inside grease chamber 121 of axletree side pipe 112 is divided into by the piston 141 of piston rod 140: receive the piston rod side grease chamber 121A of piston rod 140 and do not receive the piston side grease chamber 121B of piston rod 140.

Aforementioned cyclic grease chamber 120, by being arranged at the oilhole 120A in axletree side pipe 112, is communicated with piston rod side grease chamber 121A by front fork 110.

In front fork 110, in the inside of axletree side pipe 112, piston 141 in the face of piston side grease chamber 121B lower surface and be arranged at axletree side pipe 112 bottom base 144 in the face of piston side grease chamber 121B upper surface between axle spring 143 is housed.Front fork 110 utilizes the flexible of axle spring 143 to absorb the impulsive force born from road surface when vehicle travels.

Base 144 is filled in the internal diameter of the bottom of axletree side pipe 112 with sealing state by O shape ring 145.In base 144, the path end difference being located at lower end side periphery from top be locked on axletree side pipe 112 bottom internal diameter endless groove Sealing shield ring 146 engage, thus, link in the bottom of direction of principal axis and axletree side pipe 112.The upper surface of base 144 is the seat surface of axle spring 143.

Front fork 110 is equipped with attenuation power generating means 150 in piston 141.As shown in figure 12, attenuation power generating means 150 is equipped with in piston 141: the elongation compression common-use tunnel 151 that can be communicated with piston rod side grease chamber 121A and piston side grease chamber 121B.In piston 141, on the end face (valve seat) in the face of piston rod side grease chamber 121A, set up the disc valve with holes 152 (hole 152A) extending compression common-use tunnel 151 for opening and closing, utilize valve spring 153, valve drg 154 to support this disc valve 152.That is, when utilizing bolt 142 to be fixed on the top end face of piston rod 140 by piston 141, between the top end face and the upper surface of piston 141 of piston rod 140, disc valve 152, valve spring 153 and valve drg 154 is clamped.

Attenuation power generating means 150 is in extended travel, the high pressure oil of piston rod side grease chamber 121A by the hole 152A of disc valve 152, extend compression common-use tunnel 151 and entered piston side grease chamber 121B by force feed, produce the elongation attenuation power caused because of the channel resistance of hole 152A.In compression stroke, the high pressure oil of piston side grease chamber 121B acts on disc valve 152 from elongation compression common-use tunnel 151, disc valve 152 is lifted from the upper surface of piston 141, and entered piston rod side grease chamber 121A by force feed, produce the channel resistance in the gap because being formed between disc valve 152 and the upper surface of piston 141 and the compression attenuation power caused.

In front fork 110, periphery, upper end around piston rod 140 configures the drg rubber 147 abutted with the lower surface of fork bolt 113, and the slipper 148 supported by the Sealing shield ring 148A being snapped into the periphery, upper end of piston rod 140 is crimped on the lower surface of drg rubber 147.When the maximum compression of front fork 110, the upper end caulking part 112C of axletree side pipe 112, by hitting combination in slipper 148 and drg rubber 147, limits maximum compression stroke thus.

The bounce-back spring 147 that front fork 110 holds the lower end periphery around piston rod 140 at the upper surface of valve drg 154 and configures.When the maximum elongation of front fork 110, partition wall member 130 impacts with bounce-back spring 147 and combines, and limits maximum elongation stroke thus.

But, in front fork 110, as shown in Figure 10, the sectional area S1 of the above-mentioned ring-type grease chamber 120 be made up of the annular slot between car body side pipe 111 and axletree side pipe 112 is formed as being more than or equal to sectional area (area that the external diameter surrounds) S2 of piston rod 140.

Partition wall member 130 is provided with next door check valve 160.For next door check valve 160, (A) in extended travel, micro gap passage is formed around piston rod 140, for by because of the sectional area S1 of ring-type the grease chamber 120 and difference Δ S of the sectional area S2 of piston rod 140, the oil in remaining grease chamber 121 is discharged from piston rod side grease chamber 121A to oil cabinet 122, (B) in compression stroke, formed and supplement passage, for by the oil of deficiency supplements to grease chamber 121 from oil cabinet 122 because of the sectional area S1 of ring-type the grease chamber 120 and difference Δ S of the sectional area S2 of piston rod 140.

As shown in Figure 10, next door check valve 160 is incorporated between the upper annular plate 133 of partition wall member 130 and lower annular plate 134, be formed as shorter than the interval of upper annular plate 133 and lower annular plate 134, and form the external diameter less than the internal diameter of axle sleeve 132, micro gap passage between being formed as by the periphery of piston rod 140 and carry out the cylindrical shape of displacement up and down, forms translot 161 in lower surface.Next door check valve 160 is equipped with the valve spring 162 be made up of compression coil spring between lower annular plate 134, and upwards annular plate 134 side applies elastic force thus.In compression stroke, link mobile with the piston rod 140 entering axletree side pipe 112 and move downwards, impact with lower annular plate 134 and combine, and form gap between it and upper annular plate 133, the oil of oil cabinet 122 can be supplemented via its periphery from translot 161 to piston rod side grease chamber 121A.

Front fork 110 action in the following way.

(compression stroke)

Car body side pipe 111 enters axletree side pipe 112, by with the car body side pipe 111 together piston 141 of movement and the oil of the piston side grease chamber 121B be retracted becomes high pressure, as mentioned above, open disc valve 152, oil pressure is sent into piston rod side grease chamber 121A, result, as mentioned above, compression attenuation power is produced.

In this compression stroke, due to the difference Δ S of the sectional area S1 of ring-type the grease chamber 120 and sectional area S2 of piston rod 140, should supplement and be added to piston rod side grease chamber 121A via next door check valve 160 from oil cabinet 122 to the oil of the magnitude of recruitment of ring-type grease chamber 120.

(extended travel)

Car body side pipe 111 exits from axletree side pipe 112, by with the car body side pipe 111 together piston 141 of movement and the oil of the piston rod side grease chamber 121A be retracted becomes high pressure, be sent to piston side grease chamber 121B by the hole 152A of disc valve 152, result, as mentioned above, stretching attenuation power is produced.

In this extended travel, due to the difference Δ S of the sectional area S1 of ring-type the grease chamber 120 and sectional area S2 of piston rod 140, the oil of the component should discharged from ring-type grease chamber 120 is discharged to oil cabinet 122 from piston rod side grease chamber 121A via next door check valve 160.

But, in front fork 110, in order to can easily and with high rigid group entrucking side pipe 111 and axletree side pipe 112, according to the method described in following (1), (2), the bottom of axletree side pipe 112 is inserted and secured on (Fig. 9, Figure 13) in the recess 115 of axle shank 114.

Herein, axletree side pipe 112 is provided with outer screw section 171 in the periphery of bottom.In addition, axle shank 114 has the elongate pocket 115 of the suitable degree of depth equivalent length scope of the bottom of axletree side pipe 112 can inserted, and is provided with female threaded portion 172 in the inner circumferential of this recess 115.Axle shank 114 is through to the handle hole 114A that its bottom surface offers the tightening device (not shown) arranged at the center shaft of recess 115 from outside.Handle hole 114A is sealed by cap 114B.

As shown in Figure 9, axle shank 114 has the cross-drilled hole 114C intersected with a part for the inner circumferential of recess 115, be inserted into a part for the periphery of the drg bolt 116 in this cross-drilled hole 114C to engage with a part of the endless groove 112D on the periphery being arranged on axletree side pipe 112, stop axletree side pipe 112 to depart from from axle shank 114.The outer screw section 171 of axletree side pipe 112 is arranged near its top end face A compared with endless groove 112D, and the female threaded portion 172 of axle shank 114 is arranged near the B of bottom surface compared with cross-drilled hole 114C.

In the bottom of axletree side pipe 112, engaged part 181 is set.Discoideus guard ring 190 between the bottom surface B being also provided with the top end face A of the bottom being clipped in axletree side pipe 112 and the recess 115 of axle shank 114, this guard ring 190 is provided with engagement section 191, and this engagement section 191 is engaged around the center shaft of axletree side pipe 112 and the engaged part 181 of this axletree side pipe 112.In the present embodiment, the circumferencial direction many places (such as everywhere) of the top end face A in the bottom of axletree side pipe 112 arrange the engaged part 181 of corner breach channel-shaped.Multiple (such as everywhere) of the circumferencial direction in the periphery of guard ring 190 arrange the engagement section 191 of corner overshooting shape.Guard ring 190 is the heart portion connecting hole 192 that is equipped with the tightening device such as hex spanner inserted from the handle hole 114A of axle shank 114 to engage wherein.

(1) manually the mode such as fastening by the outer screw section 171 be arranged on the periphery of the bottom of axletree side pipe 112 be arranged at axle shank 114 recess 115 inner circumferential on female threaded portion 172 be spirally connected, temporarily fix.

Now, in the recess 115 of axle shank 114, the bottom surface B of recess 115 puts belleville spring pad 200, belleville spring pad 200 is put guard ring 190, the engagement section 191 of guard ring 190 is snapped in the engaged part 181 of axletree side pipe 112.For be filled into axletree side pipe 112 bottom internal diameter in and the lower surface of the base 144 engaged with Sealing shield ring 146 from top along the direction of principal axis of this axletree side pipe 112, and to snap in the engaged part 181 of axletree side pipe 112 between the upper surface that the direction of principal axis of this axletree side pipe 112 touches the guard ring 190 of engaged part 181 by gap, mutually can not disturb with guard ring 190.Guard ring 190 and belleville spring pad 200 are formed with the external diameter more smaller than the internal diameter of the recess 115 of axle shank 114, can insert the inner circumferential of recess 115 actively.

(2) under the outside face utilizing grips to hold axle shank 114 makes it be in the state rotating stop, utilization makes guard ring 190 rotate from the outside hex spanner (tightening device) inserted axle shank 114, and (hex spanner inserts in its recess 115 from the handle hole 114A be arranged at axle shank 114, by the engaging with the connecting hole 192 be arranged on guard ring 190, this guard ring 190 is rotated), by the engagement of the engagement section 191 of guard ring 190 and the engaged part 181 of axletree side pipe 112, this axletree side pipe 112 is rotated, make the outer screw section 171 on the periphery of the bottom being arranged at axletree side pipe 112 be arranged at axle shank 114 recess 115 inner circumferential on female threaded portion 172 engage.The B side, bottom surface of the top end face A of the bottom of axletree side pipe 112 and the recess 115 of axle shank 114 (the belleville spring pad 200 on the B of bottom surface) is rushed connect, thus, the bottom of axletree side pipe 112 is fastened in the recess 115 of axle shank 114.

When the bottom of axletree side pipe 112 is fastened in the recess 115 of axle shank 114, between the top end face A of the bottom of axletree side pipe 112 and the bottom surface B of the recess 115 of axle shank 114, pad is housed, be in the present embodiment belleville spring pad 100 periphery near part.

In addition, when the bottom of axletree side pipe 112 is fastened in the recess 115 of axle shank 114, be clamped with elastic body between the bottom surface B of the lower surface of guard ring 190 and the recess 115 of axle shank 114, be in the present embodiment belleville spring pad 200 inner circumferential near part.

According to the present embodiment, there is following action effect.

A () is under the assembled state of axletree side pipe 112 and axle shank 114, utilize the tightening device inserted axle shank 114 from outside that guard ring 190 is rotated, by engaging of the engagement section 191 of guard ring 190 and the engaged part 181 of axletree side pipe 112, make outer screw section on the periphery of the bottom being arranged at axletree side pipe 112 171 be arranged at axle shank 114 recess 115 inner circumferential on female threaded portion 172 screw togather, the bottom surface B of the top end face A of the bottom of axletree side pipe 112 and the recess 115 of axle shank 114 (or the pad (belleville spring pad 200) on the B of bottom surface) is rushed connect, thus, the bottom of axletree side pipe 112 is fastened in the recess 115 of axle shank 114.Produce surface pressure at the wider contact part of two flat of threads of the outer screw section 171 of axletree side pipe 112 and the female threaded portion 172 of axle shank 114, axletree side pipe 112 and axle shank 114 can be rigidly fixed with height.

If b () uses tightening device to make guard ring 190 reverse, the temporary fixing state that the surface pressure then becoming the contact part of two flat of threads of the outer screw section 171 of axletree side pipe 112 and the female threaded portion 172 of axle shank 114 disappears, manually the mode such as rotation easily can be rotated and decompose axletree side pipe 112 and axle shank 114.

In addition, after manually axletree side pipe 112 and axle shank 114 are become temporary fixing state by the method such as fastening, if utilize tightening device to make guard ring 190 rotate, then can easily axletree side pipe 112 be re-assemblied on axle shank 114.

C () is in order to be fixed on axle shank 114 by axletree side pipe 112, the outside of axletree side pipe 112 need not be held, therefore, damage can not be caused to the outside of axletree side pipe 112 of oil sealing 111B moving contact with the peristome being arranged at car body side pipe, can guaranteed quality.Therefore, it is possible to share on manufacturing line car body side pipe being inserted the just vertical front fork in axletree side pipe 112 in the mode that can slide.

D () can easily decompose from the bottom of axletree side pipe 112 and pull down axle shank 114, therefore, it is possible to the build-in components of axletree side pipe 112 from axle side repair and replacement axle spring 143 and attenuation power generating means 150 etc.Like this, can not only the upper end of axletree side pipe 112 be arranged at and partition wall member 130 riveted joint being inserted with piston rod 140 is fixed on the upper end of axletree side pipe 112, and can reduce costs.

In the present embodiment, under the state pulling down axle shank 114 from the bottom of axletree side pipe 112, can not only from the lower ending opening portion of axletree side pipe 112 between outside dismounting base 144, axle spring 143, and can dismounting is separated from the bolt 140A of fork bolt 113 between outside from the lower ending opening portion of axletree side pipe 112 piston rod 140 and piston 141 (attenuation power generating means 150).

E () is provided with the engaged part 181 of breach channel-shaped on the top end face A of the bottom of aforementioned axletree side pipe 112, the periphery of aforementioned guard ring 190 is provided with the engagement section 191 of overshooting shape.Engaged part 181 and engagement section 191 can be formed easily.

F () aforementioned tightening device inserts from the handle hole 114A offered at axle shank 114, by the engaging with the connecting hole 192 be arranged on guard ring 190, this guard ring 190 is rotated.Can form easily and utilize tightening device to rotate the rotary manipulation structure of guard ring 190.

G (), when the bottom of above-mentioned axletree side pipe 112 is fastened in the recess 115 of axle shank 114, is equipped with pad (belleville spring pad 200) between the top end face A of the bottom of axletree side pipe 112 and the bottom surface B of the recess 115 of axle shank 114.Adopt at axletree side pipe 112 hard materials such as iron to form, when axle shank 114 adopts the soft materials such as aluminum alloy to form, axle shank 114 can be protected.

H (), when the bottom of above-mentioned axletree side pipe 112 is fastened in the recess 115 of axle shank 114, sandwiches elastic body (belleville spring pad 200) between the bottom surface B of the recess 115 of guard ring 190 and axle shank 114.After use guard ring 190 assembles axletree side pipe 112 and axle shank 114, rocking of guard ring 190 can be prevented.

Above, illustrating in detail embodiments of the invention with reference to the accompanying drawings, concrete structure of the present invention is not limited to this embodiment, and the design modification etc. not departing from the scope of aim of the present invention is also contained in the present invention.Such as, when the bottom of axletree side pipe 112 is fastened in the recess 115 of axle shank 114, the pad loaded between the top end face A of the bottom of axletree side pipe 112 and the bottom surface B of the recess 115 of axle shank 114 and be sandwiched in below guard ring 190 and axle shank 114 recess 115 bottom surface B between elastic body miscellaneous part also can be adopted to form.

(embodiment 3) (Figure 14, Figure 15)

The front fork 110 of the embodiment 3 shown in Figure 14, Figure 15 is with the difference in embodiment 2, uses guard ring 300 to replace base 144 and guard ring 190.

Guard ring 300 and the inner circumferential of the bottom of axletree side pipe 112 are screwed (J) and form one, in the present embodiment, flange 301 is equipped with in bottom, this flange 301 abuts with the smooth end face A of the bottom (not being provided with the engaged part 181 of embodiment 2) of axletree side pipe 112, and is landed on the bottom surface B of the recess 115 of axle shank 114.

Guard ring 300 is provided with outer screw section 311 in the periphery on the top of flange 301, and axletree side pipe 112 is provided with female threaded portion 312 in the inner circumferential of bottom.Same with embodiment 2, be provided with outer screw section 171 at axletree side pipe 112 in the periphery of bottom, be provided with female threaded portion 172 in the inner circumferential of the recess 115 of axle shank 114.

Now, be screwed the rotation direction of the outer screw section 311 of (J) guard ring 300 and axletree side pipe 112 and the ridge of female threaded portion 312, be opposite sense with the rotation direction being screwed (K) axletree side pipe 112 and the outer screw section 171 of axle shank 114 and the ridge of female threaded portion 172.That is, the J that is screwed of outer screw section 311 and female threaded portion 312 is right-hand screw, and the K that is screwed of outer screw section 171 and female threaded portion 172 is left-hand screw.

The base 144 of guard ring 300 dual-purpose embodiment 2, so between flange 301 and outer screw section 311, the periphery chimeric with the inner circumferential of axletree side pipe 112 is loaded O shape ring 302.The upper surface of guard ring 300 is seat surface of axle spring 143.

Therefore, in front fork 110, in order to easily and with high rigid group entrucking side pipe 111 and axletree side pipe 112, as described in following (1) ~ (3), the bottom of axletree side pipe 112 can be inserted and be fixed in the recess 115 of axle shank 114.

(1) in the periphery of axletree side pipe 112, utilizing holding instrument to hold the predetermined outside face (being inserted into the periphery beyond the reservations in car body side pipe 111) be inserted in the recess 115 of axle shank 114 makes it rotate stop, the outer screw section 311 of guard ring 300 is screwed securely (J) on the female threaded portion 312 of the inner circumferential of the bottom of this axletree side pipe 112.Thus, the flange 301 of guard ring 300 is touched and is landed on the end face A of the bottom of axletree side pipe 112.

(2) according to above-mentioned (1), the bottom being combined with the axletree side pipe 112 of guard ring 300 is inserted in the recess 115 of axle shank 114, manually the outer screw section 171 of axletree side pipe 112 is spirally connected with the female threaded portion 172 of axle shank 114 by the mode such as fastening, temporarily fixes.Now, the flange 301 of guard ring 300 is landed on the bottom surface B of the recess 115 of axle shank 114 lightly.

(3) under the state utilizing the outside face of holding instrument holding axle shank 114 to stop it to rotate, utilization makes guard ring 300 rotate from the outside hex spanner (tightening device) inserted axle shank 114, and (hex spanner inserts in its recess 115 from the handle hole 114A be arranged at axle shank 114, by with the engaging of the connecting hole 303 be arranged on guard ring 300, this guard ring 300 is rotated), make the outer screw section 171 in the inner circumferential of the bottom being arranged at the axletree side pipe 112 rotated integratedly with guard ring 300 be arranged at axle shank 114 recess 115 inner circumferential on female threaded portion 172 engage.The top end face A of the bottom of axletree side pipe 112 is by the flange 301 of guard ring 300, and rush with the bottom surface B of the recess 115 of axle shank 114 and connect, the bottom of axletree side pipe 112 is fastened in the recess 115 of axle shank 114.

According to the present embodiment, there is following action effect.

A (), in the bottom of axletree side pipe 112, has the center shaft around this axletree side pipe 112 and shape all-in-one-piece guard ring 300.When assembling axletree side pipe 112 and axle shank 114, utilize the tightening device inserted axle shank 114 from outside that guard ring 300 is rotated, make outer screw section on the periphery of the bottom being arranged at the axletree side pipe 112 rotated integratedly with guard ring 300 171 be arranged at axle shank 114 recess 115 inner circumferential on female threaded portion 172 screw togather, the B side, bottom surface of the top end face A of the bottom of axletree side pipe 112 and the recess 115 of axle shank 114 (pad on bottom surface B or bottom surface B) is rushed connect, thus, the bottom of axletree side pipe 112 is just fastened in the recess 115 of axle shank 114.There is surface pressure in the wider contact part of two flat of threads of the outer screw section 171 of axletree side pipe 112 and the female threaded portion 172 of axle shank 114, axletree side pipe 112 and axle shank 114 can be fixed with high rigidity.

B () guard ring 300 is screwed (J) with the inner circumferential of the bottom of axletree side pipe 112 and forms one.Therefore, when utilizing the tightening device inserted axle shank 114 from outside to make guard ring 300 rotate, guard ring 300 is screwed J by above-mentioned and rotate integratedly.

The rotation direction of the guard ring 300 that c () is screwed (J) above-mentioned (b) and the ridge of axletree side pipe 112 is opposite sense with the rotation direction of the ridge being screwed (K) axletree side pipe 112 and axle shank 114.Therefore, when utilization makes guard ring 300 rotate from the outside tightening device inserted axle shank 114, guard ring 300 rotates integratedly by the above-mentioned J of being screwed, further, the outer screw section 171 rotating the periphery of the axletree side pipe 112 of this guard ring 300 integratedly reliably screws togather with the female threaded portion 172 of the inner circumferential of axle shank 113 by the above-mentioned K of being screwed.

D the guard ring 300 of () above-mentioned (b) is equipped with flange 301, this flange 301 abuts with the end face A of the bottom of axletree side pipe 112, and is landed on the bottom surface B of the recess 115 of axle shank 114.Thus, the top end face A of the bottom of axletree side pipe 112 is by the flange 301 with its shape all-in-one-piece guard ring 300, and rush with the bottom surface B of the recess 115 of axle shank 114 and connect, the bottom of axletree side pipe 112 is fastened in the recess 115 of axle shank 114.

E () above-mentioned tightening device inserts from the handle hole 114A be opened in axle shank 114, by with the engaging of the connecting hole 303 be arranged on guard ring 300, this guard ring 300 is rotated.Can form easily and utilize tightening device to rotate the rotary manipulation structure of guard ring 300.

Guard ring also can be diametrically set up and shape all-in-one-piece pin 401 (Figure 16) in the inner circumferential of the bottom of axletree side pipe 112.

In the present invention, axletree side pipe inserts in car body side pipe in the mode that can slide, between car body side pipe and axletree side pipe, axle spring is housed, the bottom of axletree side pipe is inserted into and is fixed in the recess of axle shank, in the front fork formed like this, make the outer screw section on the periphery of the bottom being arranged at axletree side pipe be arranged at axle shank recess inner circumferential on female threaded portion be spirally connected, thus, form temporary fixing state, the top end face of the bottom of axletree side pipe is left from the bottom surface of the recess of axle shank, the contact part of two flat of threads of the above-mentioned outer screw section of axletree side pipe and the above-mentioned female threaded portion of above-mentioned axle shank can not produce surface pressure, the fastening bolt snapped in from outside axle shank in the base linked along direction of principal axis and the bottom of the axletree side pipe be under temporary fixing state, by axletree side pipe to axle shank tractive, thus, under top end face in the bottom of axletree side pipe does not rush with the bottom surface of the recess of axle shank the state connect, the contact part being formed in two flat of threads of the above-mentioned outer screw section of axletree side pipe and the above-mentioned female threaded portion of axle shank produces the assembled state of surface pressure.Like this, in front fork, can easily and with high rigid group entrucking axle side pipe and axle shank.

In the present invention, axletree side pipe inserts in car body side pipe in the mode that can slide, between car body side pipe and axletree side pipe, axle spring is housed, the bottom of axletree side pipe is inserted into and is fixed in the recess of axle shank, in the front fork formed like this, there is the center shaft around this axletree side pipe and shape all-in-one-piece guard ring in the bottom of axletree side pipe, utilize the tightening device inserted axle shank from outside that guard ring is rotated, make the outer screw section on the periphery of the bottom being arranged at the axletree side pipe rotated integratedly with guard ring be arranged at axle shank recess inner circumferential on female threaded portion screw togather, bottom surface one side blow of the top end face of the bottom of axletree side pipe and the recess of axle shank is connect, thus, the bottom of axletree side pipe is just fastened in the recess of axle shank.Like this, in front fork, can easily and with high rigid group entrucking axle side pipe and axle shank.

Claims

1. a front fork, wherein, axletree side pipe inserts in car body side pipe in the mode that can slide, and between car body side pipe and axletree side pipe, axle spring is housed, and the bottom of axletree side pipe is inserted into and is fixed in the recess of axle shank, and the feature of this front fork is:

Utilize the fastening device inserted from outside axle shank, be formed in outer screw section on the periphery of the bottom being arranged at axletree side pipe be arranged at axle shank recess inner circumferential on female threaded portion two flat of threads contact part on produce the assembled state of surface pressure.

2. a front fork, wherein, axletree side pipe inserts in car body side pipe in the mode that can slide, and between car body side pipe and axletree side pipe, axle spring is housed, and the bottom of axletree side pipe is inserted into and is fixed in the recess of axle shank, and the feature of this front fork is:

By the outer screw section on the periphery of the bottom by being arranged at axletree side pipe be arranged at axle shank recess inner circumferential on female threaded portion be spirally connected, being formed makes the top end face of the bottom of axletree side pipe leave from the bottom surface of the recess of axle shank, the contact part of two flat of threads of the described outer screw section of axletree side pipe and the described female threaded portion of described axle shank does not produce the temporary fixing state of surface pressure

The base linked along direction of principal axis and the bottom of axletree side pipe be under temporary fixing state is fastenedly connected the bolt snapped in from outside axle shank, by axletree side pipe to axle shank tractive, thus, under top end face in the bottom of axletree side pipe does not rush with the bottom surface of the recess of axle shank the state connect, the contact part being formed in two flat of threads of the described outer screw section of axletree side pipe and the described female threaded portion of axle shank produces the assembled state of surface pressure.

3. front fork as claimed in claim 2, is characterized in that:

Elastic body between the bottom surface being provided with the top end face of the bottom being clamped in axletree side pipe under described temporary fixing state and the recess of axle shank.

4. front fork as claimed in claim 2 or claim 3, is characterized in that:

Described base has the detent engaged with the rotation retainer be arranged on axle shank.

5. a front fork, wherein, axletree side pipe inserts in car body side pipe in the mode that can slide, and between car body side pipe and axletree side pipe, axle spring is housed, and the bottom of axletree side pipe is inserted into and is fixed in the recess of axle shank, and the feature of this front fork is:

There is in the bottom of axletree side pipe the center shaft shape all-in-one-piece guard ring around this axletree side pipe,

Utilize the fastening device inserted axle shank from outside that guard ring is rotated, make the outer screw section on the periphery of the bottom being arranged at the axletree side pipe rotated integrally with guard ring be arranged at axle shank recess inner circumferential on female threaded portion screw togather, bottom surface one side blow of the top end face of the bottom of axletree side pipe and the recess of axle shank is connect, and the bottom of axletree side pipe is fastened in the recess of axle shank by the mode producing surface pressure with the contact part of two flat of threads at the described outer screw section of axletree side pipe and the described female threaded portion of axle shank.

6. front fork as claimed in claim 5, is characterized in that:

Described guard ring is sandwiched between the bottom surface of the bottom of axletree side pipe and the recess of axle shank, and has the engagement section of engaging with the engaged part of the bottom being arranged at axletree side pipe in the mode of the center shaft around this axletree side pipe,

Guard ring is rotated with engaging of engaged part by these engagement sections integratedly with axletree side pipe.

7. front fork as claimed in claim 6, is characterized in that:

The top end face of the bottom of described axletree side pipe is provided with the engaged part of breach channel-shaped, is provided with the engagement section of overshooting shape in the periphery of described guard ring.

8. front fork as claimed in claims 6 or 7, is characterized in that:

When the bottom of described axletree side pipe is fastened in the recess of axle shank, elastic body is crimped between the bottom surface of the recess of guard ring and axle shank.

9. front fork as claimed in claim 5, is characterized in that:

The inner circumferential of the bottom of described guard ring and axletree side pipe is screwed and forms one.

10. front fork as claimed in claim 9, is characterized in that:

The rotation direction of the ridge be combined with axle side gas thread by described guard ring is opposite sense with the rotation direction of the ridge being screwed axletree side pipe and axle shank.

11. front forks as described in claim 9 or 10, is characterized in that:

Described guard ring has and abuts with the end face of the bottom of axletree side pipe, and is landed in the flange on the bottom surface of the recess of axle shank.

12. front forks as claimed in claim 5, is characterized in that:

Described fastening device inserts from the handle hole be opened in axle shank, and by making this guard ring rotate with the engaging of the connecting hole be arranged on guard ring.

13. front forks as claimed in claim 5, is characterized in that:

When the bottom of described axletree side pipe is fastened in the recess of axle shank, between the top end face of the bottom of axletree side pipe and the bottom surface of the recess of axle shank, be equipped with pad.