CN1076801C

CN1076801C - Antifriction bearing for linear motion

Info

Publication number: CN1076801C
Application number: CN97102264A
Authority: CN
Inventors: 柿本政计
Original assignee: UHT Corp
Current assignee: UHT Corp
Priority date: 1996-10-18
Filing date: 1997-01-17
Publication date: 2001-12-26
Anticipated expiration: 2017-01-17
Also published as: TW382049B; KR100214426B1; JPH10122236A; CN1180796A; JP2816331B2; KR19980032021A

Abstract

A kind of ball bearing for linear motion which is for tightly lockup of annuli with rings and employs the elastic deformation function of chase bottom of parallel chases to have the elastic recovering force during causing the lockup portion of annuli construction board toward outside forming an approximate cylindrical shape and make the annuli construction board generate a reaction force for recovering to opened state. The reaction force is used to lock the lockup portion with the lockup portion on the inner face of rings.

Description

Antifriction bearing for linear motion

The present invention relates to antifriction bearing for linear motion, specifically, relate to the antifriction bearing for linear motion that a kind of ball and the outer circumferential face of the straight line motion portion of the inner peripheral surface of sleeve and moving linearly in retainer closely contacted, did along with the to-and-fro motion of straight line motion portion rolling motion.

Existing this kind antifriction bearing for linear motion A as shown in Figure 5, be applied to workpiece (machined object) is carried out in the hand-held grinding device of grinding, grinding, make front end have spring clip head 200 ' sliding axle (straight line motion portion) 4 guiding of doing straight reciprocating motion all fields such as use.

Its concrete structure is, offering ball load hole 42 dispersedly on metallic tubular retainer 2, is contained on this tubular retainer 2 and inside and outside outstanding from this retainer 2 than the ball 12 of load hole 42 little circles, and this tubular retainer 2 is assembled in the sleeve 1.In addition, ball 12 is to pack under the state that has applied lubricating grease in the ball load hole 42, so even ball load hole 42 than ball 12 big circles, ball 12 can not fall from ball load hole 42 yet.

When this antifriction bearing for linear motion A is applied in the above-mentioned hand-held grinding device that carries out grinding, grinding, be arranged in the accommodation section 15 of housing 5 inner peripheral surfaces the bottom crimping of enclose the land in week the O shape circle 3 that is located at sleeve 1 outer circumferential face and this accommodation section 15.

This antifriction bearing for linear motion A, because ball 12 closely contacts with the outer circumferential face of the inner peripheral surface of sleeve 1 with the straight line motion portion 4 of moving linearly in retainer 2, to-and-fro motion along with straight line motion portion 4, rolling motion in ball load hole 42, the same position of supporting straight line motion portion 4 directly advances the good speciality of precision so can have.

This antifriction bearing for linear motion A is with being pressed into mode retainer 2 to be assembled in the sleeve 1.That is, establish lip part 400, retainer 2 is pressed in the sleeve 1, retainer 2 is fixed in the sleeve 1 by the crimp force of lip part 400 and sleeve 1 inner peripheral surface in the end week of retainer 2.

But this assembling mode depends on machining accuracy, and the vibration when reciprocatingly sliding because of straight line motion portion 4 (vibration repeatedly of Driving force, the power of reversing) retainer 2 is deviate from from sleeve 1 sometimes, lacks long term reliability.

In addition, according to the situation of packing in the ball 12 past ball load holes 42, to-and-fro motion along with straight line motion portion 4, the ball 12 that rolls in load hole 42 is the front and back peritreme of collision friction load hole 42 sometimes, make retainer produce metallic dust, this metallic dust becomes the resistance to motion of straight line motion portion 4, becomes the straight-line obstacle of highi degree of accuracy.

The present invention makes in view of the above problems, its purpose be to provide a kind of can be securely fixed in retainer in the sleeve and also straight line motion portion directly advance the good antifriction bearing for linear motion of precision.

To achieve these goals, the antifriction bearing for linear motion that the present invention is first, be provided with the ball load hole of dispersion on the retainer in being embedded in sleeve, adorning ball in all ball load holes less than this hole, all balls protrude in inside and outside the retainer, all balls closely contact with the outer circumferential face of the straight line motion portion of the inner peripheral surface of sleeve and moving linearly in retainer, along with rolling motion is made in the to-and-fro motion of straight line motion portion, wherein the main points of the technical measures of being taked are, has wear resistance, by plastics forming, the retainer of deployed condition constitutes on the plate, broad ways is provided with some parallel slots at a distance of certain intervals, this parallel slot will constitute plate and be divided into some strips portion, in each strip portion, offer above-mentioned ball load hole and from the integrally prominent joining portion of establishing of the same one side of required strip portion two end portions, utilize the resiliently deformable of parallel slot bottom land, make the joining portion towards the other places retainer that is loading ball in the above-mentioned load hole be constituted coiled sheet and become slightly tubular, the joining portion is inserted and is bonded in the joint that is formed on the sleeve inner face under this state.

In addition, the antifriction bearing for linear motion that the present invention is second, wherein main points are, and above-mentioned first described joining portion is protuberance or recess, and the joint is to insert recess or the protuberance that engages usefulness for above-mentioned protuberance or recess.

According to abovementioned technology, utilize the resiliently deformable of parallel slot bottom land, when making the joining portion retainer of deployed condition be constituted coiled sheet towards the other places to become slightly tubular, elastic recovery effect by its bottom land, produce the counter-force of recovering deployed condition, this counter-force is bonded on the joining portion on the joint of sleeve inner face securely.

In addition, to-and-fro motion along with straight line motion portion, when ball rolls in the ball load hole, even the front and back peritreme of collision friction load hole, because retainer wear resistance plastics forming, so the resiliently deformable of himself absorbs this collision, and suppress the generation of powder because of itself wear resistance.

In the time of in sleeve that retainer is packed into, be retainer to be constituted coiled sheet become diameter to insert space in the sleeve less than the summary tubular in space in the sleeve, unclamp hand during corresponding to the position of joint at the joining portion, elastic recovery by bottom land acts on the power (counter-force) that retainer constitutes generation recovery deployed condition on the plate, and this restoring force is inserted the joining portion and be bonded in the joint.

Fig. 1 is a profile diagram of equipping the hand-held grinding device of embodiment of the invention antifriction bearing for linear motion.

Fig. 2 is (2) among Fig. 1-(2) line amplification profile diagram.

Fig. 3 is the stereogram that retainer constitutes plate.

Fig. 4 is above-mentioned (2)-(2) the line amplification profile diagram of expression retainer assembled state.

Fig. 5 is a local profile diagram of equipping the hand-held grinding device of existing antifriction bearing for linear motion.

Below, with reference to the description of drawings embodiments of the invention.

Expression has the embodiment of the hand-held grinding device of antifriction bearing for linear motion among the figure, and mark A represents antifriction bearing for linear motion, and B represents hand-held grinding device.

As shown in Figure 1, antifriction bearing for linear motion A has the O shape circle that is located at sleeve 1 outer circumferential face in sleeve 1, retainer 2 and week.Retainer 2 is embedded in the sleeve 1, is supporting to protrude in retainer 2 inside and outside, disperse and rotating minor diameter balls 12.

Above-mentioned retainer 2 is that retainer is constituted plate 2 ' be rolled into slightly after the tubular, inserts and be contained in the sleeve in the space 11.Retainer constitutes plate 2 ' formed by polyoxymethylene, plastics that the polyphenylene sulfide uniform wearability is good.

Specifically, as shown in Figure 3, retainer constitute plate 2 ' deployed condition, be provided with parallel slot 22 along its width direction apart with one side certain intervals, all parallel slots 22 will constitute each strip portion 32 of plate 2 ' be divided into, offer ball load hole 42 in each strip portion 32, the two ends in strip portion 32 are partly from the integrally prominent joining portion 52 of establishing of the one side that parallel slot is arranged.

Above-mentioned ball load hole 42 perforates become diameter than ball 12 big circles that are mounted in it.

Above-mentioned joining portion 52 is protuberance in the present embodiment, is the protuberance that sets out from strip portion two distal process of odd column or even column in the one side that is provided with parallel slot 22.

Before in installing to sleeve 1, will make earlier ball (minor diameter) 12 that the straight line motion portion 4 that hereinafter addresses makes sliding movement under the state that has applied lubricating grease rotationally and in protruding in the other places put in the above-mentioned load hole 42.

Established annular recess 1 last week at sleeve as joint 21, this annular recess partly be located at retainer constitute plate 2 ' the corresponding inner peripheral surface two end part part in joining portion 52, O shape circle 3 is chimeric with the recess 31 that is located on the outer circumferential face.

When being assembled into retainer 2 in the above-mentioned sleeve 1, as shown in Figure 4, utilize the resiliently deformable function of the bottom land 22a part of parallel slot 22, above-mentioned retainer is constituted plate 2 ' be rolled into diameter less than the overlapped summary tubular in space in the sleeve 11 and end, under this state, insert in the sleeve 11.Then, when hand is unclamped in the 21 corresponding positions, joint that form on joining portion 52 and sleeve inner peripheral surface, elastic recovery effect by bottom land 22a part, retainer 2 naturally and understandably recover deployed condition that counter-force, joining portion 52 is engaged with joint 21, like this, retainer 2 is assembled in the sleeve 1 (Fig. 2).

In addition, above-mentioned retainer constitute plate 2 ' width dimensions (L) and the width dimensions (1) of each strip portion.Preestablish in this wise, that is, in the time of in being assembled in sleeve 1, ball 12 each and every one and sleeve 1 inner peripheral surfaces become state of contact gently.

In the present embodiment, the diameter of ball 12 is about 1.2mm, and the diameter of ball load hole 42 is about 2mm.

Retainer 2 is assembled in the sleeve 1 the antifriction bearing for linear motion A that constitutes as shown in Figure 1, is arranged in the accommodation section 15 in the housing 5 of hand-held grinding device B.

The B of hand-held grinding device shown in the present embodiment makes the grindings such as grinding stone, the lapping tool that are installed on the chuck do straight reciprocating motion, and workpiece is carried out grinding, grinding.

Among the hand-held grinding device B, shell 35 is inlaid in the periphery of inner casing 25, is screwing togather Forward End Cap 45 at the front port of inner casing 25, is screwing togather rear end cap 55 at the rear port of this inner casing 25, constitute above-mentioned housing 5 like this, be provided with air supply control part 6 at the rear port place of this housing 5.

The structure of air supply control part 6 is known, promptly use the opening of the embolism 16 closed above-mentioned rear end caps 55 that can advance and retreat, and the axle center at this embolism 16 is provided with the air supply unit 16a that connects pressurized air supply flexible pipe (not shown) with connecting, in this air supply unit 16a, connect the road 16b that supplies gas, above-mentioned embolism 16 by advance and retreat is controlled from this road 16b compressed and supplied air of supplying gas, and supplies to the nozzle body 26 that is located at these embolism 16 front sides.

Nozzle body 26 is located at the front side of above-mentioned embolism 16 to keep airtight state, makes the nozzle 26a that is arranged in the housing 5 periphery near aftermentioned impeller 7.

Be discharged to the outside from nozzle body 26a compressed and supplied air in housing 5 by the exhaust line 36 that is located on the embolism 16.

Impeller 7 is the fulcrum rotation with live axle 8, and live axle 8 is supported in the housing 5 to cross state.

Peripheral part at this impeller 7 forms a plurality of blades 17 that tilt towards a direction highlightedly, by rotating from said nozzle mouth 26a compressed and supplied air.

As the live axle 8 of the fulcrum of this impeller 7, two ends are rotatably mounted by bearing 18, fixing and holding impeller 7 and the center cylinder 9 with respect to these live axle 8 off-centre under the arm.

Connecting rod 100 front ends have the chuck portion 200 that grinding, lapping tool 300 in clamping, and cylinder 9 rotatably is embedded in the rear end of this connecting rod 100.

Chuck portion 200 is by sliding axle (hereinafter being called straight line motion portion) 4 and the spring clip head 200 ' formation that is fixed on its front end, and crimping ball 12 also is directed to slidably in the sliding space 62 in the retainer 2 of sliding axle 4 in above-mentioned antifriction bearing for linear motion A.The front end of connecting rod 100 is screwed in the straight line motion portion 4, and the grinding that is held, lapping tool 300 are done straight reciprocating motion with the stroke of the rotation driving generation of above-mentioned live axle 8.Above-mentioned stroke is equivalent to 2 times of offset (about 0.35mm) of live axle 8 and cylinder 9.

In the hand-held grinding device of above-mentioned structure, ball 12 closely contacts with the outer circumferential face of the slide part (straight line motion portion) 4 of the inner peripheral surface of sleeve 1 and moving linearly in retainer 2, along with the to-and-fro motion of slide part (straight line motion portion), in ball load hole 42, make rolling motion with 2 times of strokes to above-mentioned offset (about 0.35mm).At this moment, according to the pack situation of ball in load hole 42, even the front side or the rear side peritreme of collision friction ball load hole 42 when ball 12 rolls, because of the resiliently deformable of retainer 2 itself with this collisional absorption, and suppress the generation of powder because of itself wear resistance.

In the present embodiment, antifriction bearing for linear motion A conduct is used for being illustrated to sliding axle (straight line motion portion) the guiding person who makes grinding, lapping tool 300 moving linearlies of hand-held grinding device B, but purposes of the present invention is not limited thereto, and every device of the to-and-fro motion guiding of straight line motion portion of giving all can use antifriction bearing for linear motion of the present invention in any technical field.

In addition, in the present embodiment, joint 21 is annular recessed portion, is being the shape of recess but only also joint 21 can be made corresponding to the position as the protuberance at joining portion 52.Also recess can be made in joining portion 52, joint 21 is become protuberance.

As mentioned above, because it is to utilize the resiliently deformable function of its parallel slot bottom land to be rolled into slightly tubular that retainer of the present invention constitutes plate, lean on the counter-force of the elastic recovery effect recovery deployed condition of its parallel slot bottom land the joining portion to be inserted in the joint that is formed on the sleeve inner face, so, retainer firmly fixes with respect to sleeve, can be as the forced assembling that depends on machining accuracy of the prior art, the vibration (vibration repeatedly of Driving force, the power of reversing) that produces that reciprocatingly slides makes retainer deviate from from sleeve sometimes.

And, owing to being rolled into slightly, the retainer with so-called curtain shape (being launched into flat state) is assembled in the sleeve tubular, so, unlike using plastic monoblock ground shaping tubular retainer, the auxiliary mould of choosing that is used to form the ball load hole need be on forming die, set up, therefore the shaping expense can be reduced.

In addition, when ball is made rolling motion along with the to-and-fro motion of straight line motion portion in the ball load hole, even collide the front side or the rear side peritreme of load hole because of the situation of packing into of load hole, because the resiliently deformable of retainer itself absorbs this collision, and owing to retainer is made by material wear-resisting, that can resist frictional force, so can not produce metallic dust, can keep the good precision of directly advancing.

Claims

1. antifriction bearing for linear motion, be provided with the ball load hole of dispersion on the retainer in being embedded in sleeve, adorning ball in all ball load holes less than this hole, all balls protrude in inside and outside the retainer, all balls closely contact with the outer circumferential face of the straight line motion portion of the inner peripheral surface of sleeve and moving linearly in retainer, along with rolling motion is made in the to-and-fro motion of straight line motion portion, it is characterized in that, has wear resistance, by plastics forming, the retainer of deployed condition constitutes on the plate, broad ways is provided with some parallel slots at a distance of certain intervals, all parallel slots will constitute plate and be divided into some strips portion, in each strip portion, offer above-mentioned ball load hole and from the integrally prominent joining portion of establishing of the same one side of required strip portion two end portions, utilize the resiliently deformable of parallel slot bottom land, make the joining portion towards the other places retainer that is loading ball in the above-mentioned load hole be constituted coiled sheet and become slightly tubular, the joining portion is inserted and is bonded in the joint that is formed on the sleeve inner face under this state.

2. antifriction bearing for linear motion as claimed in claim 1 is characterized in that, above-mentioned joining portion is protuberance or recess, and the joint is to insert recess or the protuberance that engages usefulness for above-mentioned protuberance or recess.