CN103791021A

CN103791021A - Damper

Info

Publication number: CN103791021A
Application number: CN201310364893.3A
Authority: CN
Inventors: 高桥秀明; 土屋健一
Original assignee: Showa Corp
Current assignee: Hitachi Astemo Ltd
Priority date: 2012-10-31
Filing date: 2013-08-20
Publication date: 2014-05-14
Anticipated expiration: 2033-08-20
Also published as: JP2014088940A; JP5665830B2; CN103791021B

Abstract

Provided is a damper which comprises an outer pipe, an inner pipe, a spiral spring, a race, and a locking component. The outer pipe comprises a race stopping portion disposed on the lower side of the outer pipe. The inner pipe comprises predetermined length. The lower side of the inner pipe is inserted into the outer pipe. The spiral spring is accommodated in the inner pipe. The top end of the spiral spring is supported by the top end portion of the inner pipe. The race comprises a bottom end abutted against a race stopping portion disposed on the lower side of the outer pipe and a top end supporting the bottom end of the spiral spring. The race is inserted into the inner pipe. The locking component configures the length of the inner pipe in a manner that the length between the bottom end of the inner pipe and the race stopping portion is less than the length of the race.

Description

Vibration damper

Technical field

A kind of vibration damper with the shock-absorbing function being provided by helical spring is provided, especially, relates to the mounting point of spring-leaf retainer and tap hole.

Background technique

Normally, as critical piece, the simple vibration damper that lubricant oil is filled comprises: outer tube; Have the helical spring of predetermined length, this helical spring is contained in the top of outer tube; And inner tube, this inner tube is arranged in outer tube, thereby via bearing slidably.Wheel is secured to the lower end of inner tube, makes to be absorbed by helical spring from the vibration of wheel, and prevents that this vibration is delivered to the car body side that outer tube is fixed to.In this case, helical spring is supported by spring guide at its relative two ends, to be positioned (JP-A-2005-226734) in outer tube at above-below direction.About helical spring above-mentioned location, disclose a kind of structure, wherein, helical spring is arranged between the upper end of cylinder and the bottom of outer tube of extending from the bottom of inner tube, make the cylinder can be as the locating piece of spring, described at JP-A-2001-280398.

But if spring guide is arranged at respectively the above and below of spring, as disclosed in JP-A-2005-226734, the quantity of parts increases so.On the contrary, if as disclosed in JP-A-2001-280398, cylinder is reduced to the quantity of the parts of vibration damper as helical spring locating piece, setting screw spring in the axial direction, but may produce problem below.That is, in helical spring is contained in outer tube wherein, not lead screw spring diametrically.Thereby if in the time of compression helical spring, helical spring is at outer tube medium dip or lateral displacement (departing from center), helical spring may produce and contact with the end of the inner peripheral surface of outer tube or inner tube.As a result, vibration damper may break down.

In addition, the simple vibration damper that disclosed lubricant oil is filled in JP-A-2005-226734 comprises outwardly open hole, and in order to discharge the moisture that enters vibration damper inside, this outwardly open hole is formed at the lower end of absorber main body.But as disclosed in JP-A-2005-226734, in the time that tap hole is arranged in the outer diameter part of outer tube, dust easily flies to and is attached to the slide part of bearing, has adversely reduced the life-span of vibration damper.

Reference listing

Patent documentation 1:JP-A-2005-226734

Patent documentation 2:JP-A-2001-280398

Summary of the invention

Thereby, the object of this invention is to provide the simple vibration damper that a kind of lubricant oil is filled, this vibration damper allows to utilize simple structure to keep helical spring, thereby reduces the quantity of parts, and stop external dust and moisture to enter inner slide part, thereby extend the life-span of vibration damper.

The structure that is used for the vibration damper of realizing above-mentioned purpose comprises: outer tube, and this outer tube comprises the seat ring blocking portion of the downside that is arranged at described outer tube;

Inner tube, this inner tube has predetermined length, and the downside of described inner tube is inserted in described outer tube; Helical spring, this helical spring is contained in described inner tube, and described helical spring upper end is supported by the upper end portion of described inner tube; Seat ring, this seat ring have butt be arranged at the described downside of described outer tube described seat ring blocking portion lower end and support the upper end of described helical spring lower end, described seat ring is inserted in described inner tube; And stop component, the mode that this stop component is less than the length of described seat ring with the siding-to-siding block length between lower end and the described seat ring blocking portion of described inner tube is set the elongation of described inner tube.This has prevented the outer tube side protrusion of described helical spring bottom from described inner tube, thereby allows inner tube easily to move up and down.In addition, eliminate the needs of the parts to covering described helical spring bump, caused having reduced cost.

Described vibration damper can have such structure: wherein, described seat ring blocking portion is formed by the inner bottom part of described outer tube, described seat ring is by forming at the cylinder of its opposite end place opening, and described seat ring blocking portion has tap hole, this tap hole is formed as allowing the inside of described seat ring and the outside of described outer tube that contact with described inner bottom part to be communicated with.Thereby even in the time that dust or moisture enter vibration damper, dust or moisture also can not arrive the slide part that is positioned at described inner tube inside.Therefore, described inner tube can move up and down smoothly in over a long time, guarantees normal running.

Accompanying drawing explanation

Fig. 1 is the sectional view illustrating according to the embodiment of vibration damper of the present invention;

Fig. 2 is according to the amplification sectional view of the pith of vibration damper of the present invention; And

Fig. 3 illustrates that dust and moisture enter the schematic diagram in the path of the inside of vibration damper.

List of reference signs

1 inner tube

5 helical springs

7 spring-leaf retainers

9 outer tubes

15 stop rings

16 bearings

K slide part

Embodiment

Fig. 1 and Fig. 2 are the sectional views illustrating according to the embodiment's of vibration damper of the present invention front fork.In Fig. 1 and Fig. 2, represent to have the inner tube of given length with Ref. No. 1.In the upper end portion of inner tube 1, the top cap 3 with tooling hole 2 is screwed in screw section 4, to support the upper end of the helical spring 5 being contained in inner tube 1., the upper end of helical spring 5 is supported by the upper end portion of inner tube 1.Outer circumferential face by oil filling to inner tube 1.Although be provided with independently top cap 3 in the upper end portion of inner tube 1, this embodiment is not limited to this structure, and top cap 3 can be integrated with inner tube 1.Selectively, can be plugged between top cap 3 and the upper end of helical spring 5, with the upper end of support helix spring 5 such as other parts of packing ring or seat ring.

By the packing ring 8 of the upper end that is arranged at spring-leaf retainer 7 described below, stop helical spring 5 at its lower end, thereby do not stretch out from the lower end 6 of inner tube 1.

Spring-leaf retainer 7 is formed by the cylinder of the equal opening in lower end thereon.Packing ring 8 is installed on the upper end of spring-leaf retainer 7.There is the lower end of spring 5 of the diameter identical with the diameter of packing ring 8 via the upper end of packing ring 8 butt spring-leaf retainers 7.

In addition, spring-leaf retainer 7 is formed by the cylinder of the both ends open contrary.Inner tube 1 is run through in the mode penetrating in the top of spring-leaf retainer 7 on given length.The lower end of spring-leaf retainer 7 is arranged in the inside of outer tube 9.The lower end of spring-leaf retainer 7 contacts with the upper surface of the seat ring blocking portion 11 of protruding towards central shaft 10.Spring-leaf retainer 7 is stably clipped in seat ring blocking portion 11 and between the packing ring 8 of the lower end side of helical spring 5.

Seat ring blocking portion 11 is formed by the ring part of the lower end side that is arranged in outer tube 9, thereby protrudes towards central shaft 10, and has the tap hole 13 along central shaft 10.Seat ring blocking portion 11 is equivalent to by the inner bottom part of the outer tube 9 of the lower end in contact of spring-leaf retainer 7.

Tap hole 13 is formed as allowing the inside of the spring-leaf retainer 7 that its lower end contacts with inner bottom part to be communicated with the outside of outer tube 9.That is, tap hole 13 is at the inside bottom opening in its one end, and at the other end outer surface opening to outer tube 9.

Below seat ring blocking portion 11, form with central shaft 10 meet at right angles extend axletree through hole 12.

Outer tube 9 at an upper portion thereof 9a side is thin-walled, but thicker in the region of the substantial middle subordinate side of outer tube 9.Outer tube 9 comprises the end difference 9b being formed on its central part.Annular lower bearing 14 is secured to the upper end side of end difference 9b.Interior all bearing surfaces of lower bearing 14 allow the periphery of inner tube 1 to slide, thereby form the slide part K shown in Fig. 3.

Stop ring 15 is fitted in the circular groove forming in the lower outer periphery of inner tube 1 regularly.Stop ring 15 butts are arranged at the lower end of the bearing 16 on the upwards end difference 9c of outer tube 9, thereby stop inner tube 1 from upwards slippage of outer tube 9.Hereinafter stop ring 15 and bearing 16 are referred to as to stop component.Inner tube 1 can be extended until stop ring 15 contacts with the lower end generation butt of bearing 16.In this case, inner tube 1 extends to maximum.Ref. No. 19 represents from the stop ring of top rigid bearing 16.

The 19 upper end side peripheries that are included in outer tube 9 that are covered with dust are installed on the lower end in circular groove and are arranged to around the upper end of the periphery of inner tube 1.

For example, if the front fork that is locomotive by damper structure according to the present invention, axletree passes the axletree through hole 12 in outer tube 9, and wheel is attached to this axletree.Then, inner tube 1 is fixed on to car body (vehicle frame).In the time therefore vibration damper being used as to front fork, the vibration that is delivered to wheel from road surface propagates into helical spring 5 from outer tube 9 via spring-leaf retainer 7.Then, this Vibration propagation, to inner tube 1, is absorbed by helical spring 5 simultaneously.

In such vibration damping operation, if remove the load on front fork, front fork enters front fork and extends to maximum maximum extension state.As shown in Figure 2, under maximum extension state, set the lower end 6 of inner tube 1 and the position relationship of the length L (seat ring length L) of spring-leaf retainer 7.Particularly, by the siding-to-siding block length Smax(between lower end 6 and the upper end 11a of seat ring blocking portion 11, between lower end 6 and upper end 11a along the length of central shaft 10) be set as than seat ring length L, be siding-to-siding block length L(between the lower end of packing ring 8 and the upper end 11a of seat ring blocking portion 11, between the lower end of packing ring 8 and upper end 11a along the distance of central shaft 10) slightly short in m.

This setting allows the inner peripheral surface restriction of the outer periderm inner tube 1 of helical spring 5, and prevents that the downside of helical spring 5 from protruding from the lower end 6 of inner tube 1 downwards.Thereby even if for example helical spring 5 is in lateral displacement or bias, inner tube 1 also can move up and down without hindrance.Therefore, inner tube 1 always can move up and down smoothly with respect to outer tube 9.In addition, protrude from the lower end of inner tube 1 the in operation lower end that whenever all prevents helical spring 5.This has eliminated the needs of the parts of the lower end to covering helical spring 5, thereby has simplified structure.

And, unless moisture arrives the outer circumferential side of helical spring 5 via the gap between axletree through hole 12 and axletree 3, the interior all spaces that are equal to its seat ring length L in spring-leaf retainer 7, the inner space of helical spring 5 that is arranged in the upper end of spring-leaf retainer 7 and the pitch space of helical spring 5, otherwise as shown in the arrow n in Fig. 3, the moisture that enters outer tube 9 through being positioned at the opening 9x of lower end of outer tube 9 does not arrive the space that the slide part K that slides relative to one another with lower bearing 14 with inner tube 1 is communicated with.Thereby, the slide part K between the impossible arrival lower bearing 14 such as moisture, dust and bearing 16 and the periphery of inner tube 1.This allows inner tube 1 to move smoothly up and down in over a long time, guarantees normal running.

Stop component is not limited to the combination of stop ring 15 and bearing 16.For example, can form groove along the inner peripheral surface of outer tube 9, and the stop ring as the restriction parts of stop ring 15 can be set in this groove, extend to maximum position to set inner tube 1.

Claims

1. a vibration damper, comprising:

Outer tube, this outer tube comprises the seat ring blocking portion of the downside that is arranged at this outer tube;

Inner tube, this inner tube has predetermined length, and the downside of this inner tube is inserted in described outer tube;

Helical spring, this helical spring is contained in described inner tube, and this helical spring upper end is supported by the upper end portion of described inner tube;

Seat ring, this seat ring has: the lower end that is connected to the described seat ring blocking portion on the described downside that is arranged at described outer tube; With the upper end of supporting described helical spring lower end, described seat ring inserts described inner tube; And

Stop component, the mode that this stop component is less than the length of described seat ring with the siding-to-siding block length between lower end and the described seat ring blocking portion of described inner tube is set the elongation of described inner tube.

2. vibration damper according to claim 1, wherein,

Described seat ring blocking portion is formed by the inner bottom part of described outer tube,

Described seat ring is by forming at the cylinder of its opposite end place opening, and

Described seat ring blocking portion has tap hole, and this tap hole is formed as allowing the inside of described seat ring and the outside of described outer tube that contact with described inner bottom part to be communicated with.