CN1125295A

CN1125295A - Seal structure for plain bearing portion

Info

Publication number: CN1125295A
Application number: CN 94113543
Authority: CN
Inventors: 伊藤真二
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1993-12-31
Filing date: 1994-12-30
Publication date: 1996-06-26
Anticipated expiration: 2014-12-30
Also published as: JPH0742879U; CN1055531C; JP2580346Y2

Abstract

A sleeve 31 and a sealing part 32 are matched and assembled on a convex part 9; a sealing concave part 34 with a profile shaped like a pentagram is arranged on the flange 33 of the sealing part 32; a sealing part 40 which is arranged on the peripheric edge 37 of a sealing cover 36 is embedded into the sealing concave part 34. A main lip 41 is tightly attached in the sealing concave part 34 in the thrust direction; an auxiliary lip 42 protrudes out to the external end in the radius direction from the peripheric direction and is combined with a combination part 35 at the opening edge of the sealing concave part 34; the sealing part 40 can be prevented from falling down through the combination.

Description

The sealing configuration of sliding bearing

The present invention relates to the structure of sliding bearing sealing.

Open in the flat 2-125210 communique real, disclosed a kind of sealing configuration, sliding bearing covers with sealing cover, puts into Sealing between the sealing recess that forms on the flange of sealing cover and the protruding side of chimeric bearing at sliding bearing for above-mentioned flange.This Sealing is placed in the sealed groove in advance, and forming one can be from the radial direction resiliently deformable with respect to the flange of sealing cover and the lip of fluid-tight engagement.

In above-mentioned prior art, because lip is in the radial direction resiliently deformable, therefore, when being subjected to the upwards effects such as load of effect, when sealing cover relatively moved at above-below direction, the contact pressure of lip changed, and sealing will change.Moreover, sealing cover only is being installed, also be not installed under the interim installment state that gets on,, make sealing cover be installed to the state that the sealing recess goes because be the resiliently deformable that only depends on lip, in handling process, slight impact, sealing cover will come off, the result, so very bothersome, hope can have a kind of function of coming off in this case of preventing.The present invention will address this problem exactly.

In order to address the above problem, cover with sealing cover at sliding bearing, Sealing is placed on this sealing cover circumferential edges and be formed on and its corresponding locational, protruding side of bearing on the sealing recess between the sliding bearing sealing configuration in, the sealing configuration of sliding bearing of the present invention forms one to outstanding main lip and the secondary lip of sealing recess inner face when Sealing is installed in the sealing cover circumferential edges.With main lip by thrust direction in sealing recess inwall fluid-tight engagement, exterior circumferential at Sealing, make secondary lip outstanding to the radial direction outer end, and by with outside sealing recess edge of opening, place formation and combine to the inner outstanding bound fraction of radial direction, can prevent that sealing configuration from coming off.

What is called will seal recess and be arranged on the bearing projection side, be meant on arbitrary part of the sliding bearing that the sealing recess is arranged on the side of bearing protruding end or stretches out from bearing projection side.

The recess of so-called sealing is exactly in order to embed Sealing, in the part that its peripheral direction forms, and the recess that can be described as perimeter trench again or on full periphery, make.

When sealing cover is installed, when Sealing was embedded the sealing recess, at the main lip of Sealing, when closely fitting with the inwall of sealing recess from thrust direction, secondary lip combined with the connecting part of making in the sealing recess side.

Because like this, even when sealing cover relatively moves up and down, sealing keep certain in, even under interim installment state, be subjected to slight impact, can prevent simply that also it from coming off.

Fig. 1 is embodiment's a amplification sectional view;

Fig. 2 is the figure of expression assembling work;

Fig. 3 is the side view of the forward mounting part of employing embodiment's two-wheeled motorcycle.

1-front-wheel; 2-axletree; 3-front fork; 6-pivot arm; 9-convex portion; 10-axle; 11-carriage; 32-Sealing; 33-flange; 34-sealing recess; 35-bound fraction; 36-sealing cover; 37-circumferential edges; 40-Sealing; 41-main lip; 42-secondary lip.

Now embodiment is described according to Fig. 1-Fig. 3.Fig. 3 is fit to the front-wheel supporting structure figure of the two-wheeled motorcycle of employing present embodiment for expression.In this drawing, the axletree 2 of front-wheel 1 is to support by the linkage mechanism that is located at front fork 3 bottoms.

This linkage mechanism is the bottom by front fork 3, link arm 4, and pincerlike carriage 5, damper 8 has been placed, the formation front-end equipment by the quadrilateral connecting rod mechanism that pivot arm 6 is formed between the intermediate portion in the carriage 7 on front fork 3 tops and pivot arm 6.

One end of pivot arm 6 on lug boss 9, is connected with the carriage 11 that is located at front fork 3 lower ends by axle 10, and sealing configuration of the present invention described below can be used on herein.The intermediate portion of pivot arm 6 on lug boss 12, is connecting the lower end of damper 8 by axle 13.The other end of pivot arm 6 is on lug boss 14, by hub portion 15 coaxial are installed together of axletree 2 with pincerlike carriage 5 and front-wheel 1.

Brake puck 16 is housed on wheel hub 15, brakes by the pincerlike piece 17 of braking that is supported on the pincerlike carriage 5.

Link arm 4 by the lug boss 18 of an end, is supported in the top of pincerlike carriage 5 by axle 19, and the other end by lug boss 20, is supported in by axle 21 on the support 22 of carriage 11 upper ends that are located at front fork 3.

Fig. 1 is the figure that represents the sealing configuration of this part for the sectional view of the amplification of the bearing structure on the lug boss 9 of expression pivot arm 6, Fig. 2, and left-hand component has been represented the state before sealing cover is installed among the figure, and right-hand component is represented interim installment state among the figure.

As shown in these figures, axle 10 makes bolt shape, and it passes the sleeve 31 that is inserted in the axis hole 30 of making on the lug boss 9, and Sealing 32 is contained between the internal circular surfaces of axis hole 30 of sleeve 31 and lug boss 9, comes supporting axle 10 thus.

About Sealing 32 is divided into two pairs, have the flange 33 overlapping respectively with the outer surface of lug boss 9, on the outer side surface of flange 33, form a sealing recess 34 towards the open circumferential groove flute profile in the outer end of the axial direction of axle 10.

In edge of opening cylindrical side Monday of sealing recess 34, integrally form one towards the outstanding bound fraction 35 of central direction (axle 10 directions).

Sealing cover 36 is installed between support 11 and the flange 33, each side of the flange 33 about covering.It is approximate cup-shaped that sealing cover 36 is, it be the height and sealing recess 34 position overlapped that flange shape circumferential edges 37 is positioned at the axle center of its off-axis 10, on its whole peripheries, Sealing 40 is housed.

Sealing 40 is made by the suitable material that rubber etc. has big elasticity and oil resistance, the integrative-structure that outstanding main lip 41 and secondary lip 42 are formation towards the inside of sealing recess 34.

Main lip 41 is outstanding towards the direction of thrust, closely engages with the wall freedom of extending towards the radial direction that seals recess 34, and produces resiliently deformable; Secondary lip 42 is outstanding towards the outer end of radial direction by the peripheral edge of Sealing 40, with towards the sealing recess 34 the axle 10 directions outer annulus edge interior sidewall surface fluid-tight engagement in, when from sealing recess 34 when the direction that comes off moves, combine with bound fraction 35.

Space in the sealing recess 34 is separated by main lip 41 and secondary lip 42, between main lip 41 and sealing recess 34, and, in the space that the corner part position of secondary lip 42 and sealing recess 34 is formed, form the

space

43,44 that retains lubricating grease respectively by main lip 41; Make a part of lubricating grease of lubrication and seal spare 32 circumferential surface accumulate.

Sleeve 31 and Sealing 32 cooperations are contained in the lug boss 9, press on the side surface of lug boss 9 and are folding sealing cover 36, and in addition, the outer surface of sealing cover 36 is clipped by carriage 11.On sealing cover 36 and carriage 11, to do respectively to have to make axle 10 axis holes that pass through 45 and 46, these axis holes are consistent with the internal diameter of sleeve 31, and axle 10 can pass from left and right directions, and during nut 48 on being tightened in 10 a front end screw thread 47, bearing just is joined together.

The following describes the effect of present embodiment.At first,, shown in figure left side among Fig. 2, sealing cover 36 is pressed to the side surface of the lug boss 9 that sleeve 31 and Sealing 32 are installed, keep the center unanimity of each

axis hole

10,45 when sealing cover 36 is in the situation of interim installment state.

When carrying out like this, secondary lip 42, because resiliently deformable is crossed bound fraction 35, Sealing 40 enters in the sealing recess 34, main lip 41 closely is adjacent to along the smooth wall of radial direction of

sealing recess

34,42 of secondary lips with contact towards excircle inner surface axle 10 directions, that seal recess 34, become the interim installment state shown in the right-hand component among the figure.

In this state, even carry, slight impact is arranged, but, can prevent to come off because secondary lip 42 combines with bound fraction 35, therefore Sealing 40 comes off from sealing recess 34, the danger that sealing cover 36 comes off reduces, consequently, even come off, the needed workload that wastes time and energy also reduces when installing again, and installation capability is improved.

Moreover, as shown in Figure 1, when axle 10 is in installment state, even because the upwards loading on top is arranged, sealing cover 36 is moved up and down with respect to the side surface of lug boss 9, but because main lip 41 always closely is adjacent to the internal face of sealing recess 34 by thrust direction, therefore can keep uniform contact pressure, the result makes sealability stable.

The present invention is not limited only to the foregoing description, and various variations can be arranged.For example, sealing recess 34 can be done on the outer surface of lug boss 9, rather than is made of Sealing 32, and its shape must be a groove not necessarily also, and it is also passable to make step-like recess.In addition, at axletree for example shown in Figure 3 22, also can adopt this sealing configuration on each supporting portion of

axle

9,19,21 etc.

The present invention makes main lip and secondary lip on the Sealing that is installed in sealing cover circumferential edges place, make main lip from thrust direction freely, closely to the sealing recess internal face be adjacent to, produce resiliently deformable, and make secondary lip outstanding towards radial direction outer end along the Sealing excircle, by with the combining of the connecting part of making at sealing recess edge of opening, prevent to come off.Therefore, even sealing cover moves up and down relatively, also can often keep the uniform contact pressure of sealing recess, sealability improves.And, owing to be provided with and utilize secondary lip and connecting part to prevent the structure that comes off, when under interim installment state, carrying, when being subjected to slight impact loading, recess comes off, sealing cover comes off from sealing also can to prevent Sealing, so the result is that installation capability also is improved.

Claims

A kind of sealing configuration of sliding bearing, cover with sealing cover at sliding bearing, at the sealing cover circumferential edges and between the sealing recess of the bearing convex portion side surface that forms on the corresponding position with it, put into the sealing configuration of the sliding bearing of Sealing, it is characterized in that: in the circumferential edges place that Sealing is installed in sealing cover, Sealing forms one to outstanding main lip and the secondary lip of sealing recess inner face, main lip closely is adjacent to towards sealing recess inwall from thrust direction, meanwhile, make secondary lip outstanding towards radial direction outer end along the excircle of Sealing, by with on sealing recess edge of opening excircle side, form, combination towards the inner connecting part of giving prominence to of radial direction can prevent that Sealing from coming off.