CN1075175C

CN1075175C - One-way clutch

Info

Publication number: CN1075175C
Application number: CN97125453A
Authority: CN
Inventors: 福泽幸治; 高濑雅之; 荒川郁夫
Original assignee: Mitsuba Electric Manufacturing Co Ltd
Current assignee: Mitsuba Corp
Priority date: 1996-12-12
Filing date: 1997-12-11
Publication date: 2001-11-21
Anticipated expiration: 2017-12-11
Also published as: FR2757233A1; JPH10227318A; ID19138A; IT1296622B1; CN1189583A; ITTO971071A1; KR19980063943A; TW354820B; FR2757233B1

Abstract

The unidirectional clutch (30) comprises an inner hub (31) and an external rim (33) disposed concentrically. The exterior rim (33) contains a body (34) having a mounting space (35) for the interior part (31), and clutch chambers (40) formed in the internal peripheral surface of the mounting hole at equal intervals in a circumferential direction. Each chamber is cut out in the form of a wedge orientated to the outside in a radial direction, to incorporate clutch rollers (43) fitted in and rotating in the respective clutch chambers. Springs (45) each push on one of the rollers in the direction of the smaller diameter part (41) of the clutch chamber. A receiving hole (45) is formed on the larger diameter side (42) of the chamber (40) for the spring (47) in which it bottoms to take the reaction and this hole is extended (44) on the other side of the clutch chamber (40) to allow the introduction of the spring.

Description

Overrunning clutch

The present invention relates to a kind of overrunning clutch, be particularly related to the improvement on a kind of overrunning clutch external structure that has with the permanent magnet generator of the engine interlocking of a kind of motor engine or analog, for example effectively for engagement between a permanent magnet generator and the starting motor with throw off the sort of overrunning clutch of usefulness.

In general, in a kind of engine that is built into by a starting motor starting,, this starting motor and engine are thrown off comprising the engine of motorcycle or analog.For this reason, an overrunning clutch is arranged between the bent axle and starting motor of this engine.On the other hand, under many circumstances, the bent axle of an engine of motorcycle or analog directly is connected with permanent magnet generator.Thereby this structure is widely used, and is about to an overrunning clutch and packs in the permanent magnet motor, is used to finish engagement and disengagement between a starting motor and the engine.

As the structure in the permanent magnet motor on the bent axle that is directly connected to an engine that an overrunning clutch is packed into, a kind of structure is arranged, the outside of a clutch is fixed on the hub spare of permanent magnet motor by concentric type in this structure, and one is fixed on the clutch inside with the crew-served sprocket shaft of starting motor, and this clutch internal junction is incorporated in the clutch Outside.

Usually, this a kind of overrunning clutch comprises the inner and clutch Outside of a clutch, and their also mutual respectively concentric types are installed in the inside and outside.Clutch Outside comprises: a main body, and it has a mounting hole that is used for clutch inside, and clutch is connected internally in this mounting hole; One group of clutch chamber, they form with the spacing that equates on a circumferencial direction on an interior periphery surface of the mounting hole that is used for clutch inside, and each chamber all has wedge slot, in the axial direction towards the outside; One group of clutch roller, they are placed in separately the clutch chamber rotationally; With one group of spring, each spring all makes one of them clutch roller be partial to a small diameter portion of each clutch chamber.Concerning each clutch chamber, on a side of one major diameter part, have a through hole, this through hole lay a spring and pass main body from the outer periphery of main body to clutch chamber.A break inserts in the outer end portion of the through hole of laying a spring, so that born the reaction force of spring by this break pressurizedly.

In Japanese Utility Model patent 62-177929 (Laid-Open No.62-177929), this overrunning clutch has been described.

At the clutch Outside commonly used that illustrates like this, when a releasing of brake that has been pressed in the through hole, the bias force of spring on clutch roller becomes different in the value of appointment, and perhaps it is not sent on the clutch roller.In addition, because a break inserts in the outer end portion of each through hole pressurizedly, so these through holes should be used very high precision processing, and the control of dimensional accuracy becomes very strict.

An object of the present invention is to provide a kind of overrunning clutch, it can keep the bias force of spring aptly, and can reduce the strict degree of dimensional accuracy control.

According to the present invention, provide a kind of overrunning clutch that comprises a clutch inside and a clutch Outside, the concentric type arrangement is inside and outside respectively and mutually for it, this clutch Outside comprises: a main body, it has a mounting hole that is used for clutch inside, and clutch is connected internally in this mounting hole; One group of clutch chamber, they are arranged on the interior periphery surface of the mounting hole of clutch inside, form with the spacing that equates on a circumferencial direction, and each chamber all has wedge slot and in the radial direction towards the outside; One group of clutch roller, they are placed in separately the clutch chamber rotationally; With one group of spring, each spring all makes one of them clutch roller be partial to a small diameter portion of each clutch chamber, wherein: concerning each clutch chamber, on the limit of an one major diameter part, form a placed hole that puts spring, this Kong Zaiyu is used for slotting on the tangent direction of the mounting hole of clutch inside, and each spring is so inserted in the placed hole, so that spring receives a reaction force from a receiving part at the bottom of the receiving hole (a kind of power that spring is worked); And this part place of a small diameter portion of each clutch chamber in contiguous main body, an extension at the axis of the receiving hole that is used for spring accordingly has a through hole.

According to the device that illustrates herein, spring is placed in the receiving hole, and this hole has the end of spring reaction power side, and this spring is placed in the receiving part of receiving hole bottom.Therefore, the insertion that produces pressurization consequently can not resembling in break commonly used gets loose, and spring can not change at the end position of reaction force side.Thereby spring can remain on its elastic force a given level unchangeably, and can be with a given elastic force biasing clutch roller.In addition, do not need pressured type to insert, therefore can reduce strict degree the receiving hole dimensional accuracy control that is used for spring.

Except said apparatus, can open an intercommunicating pore at the receiving hole place, so that the outside of the inside of receiving hole and main body can be interconnected.Under this structure situation, when immersing in the oil with this overrunning clutch, oil just can freely pass in and out clutch chamber and be used for the receiving hole of spring, and can keep the mobile smoothness of clutch roller and spring.

In addition, in said apparatus, a helical spring seat can be connected to spring on the outer periphery of the end portion on receiving hole one side.Spring is inserted into receiving hole and is connected with spring seat simultaneously.As a result, in receiving hole, needn't form a small diameter portion, reduce and be used to align spring man-hour and cost of production, and improve the alignment accuracy and the quality of product of clutch.

From following patent specification description taken in conjunction with the accompanying drawings, above-mentioned purpose of the present invention and other purpose, and new characteristics will become more fairly obvious.

It is a partial cut away side views that Fig. 1 (a) and 1 (b) illustrate a kind of overrunning clutch as one embodiment of the present of invention: Fig. 1 (a), and Fig. 1 (b) is a cross section view of being got along the I b-I b line of Fig. 1 (a);

Fig. 2 (a) and 2 (b) illustrate the major component of the overrunning clutch of Fig. 1 (a) and 1 (b): Fig. 2 (a) is the partial cut away side views of an amplification, and Fig. 2 (b) is a cross section view of being got along the II b-II b line of Fig. 2 (a);

Fig. 3 illustrates a permanent magnet generator and starting motor and the cross-sectional front view of the overrunning clutch that uses between them;

Fig. 4 (a) and 4 (b) illustrate the major component as one second embodiment's of the present invention overrunning clutch: Fig. 4 (a) is the partial cut away side views of an amplification, and Fig. 4 (b) is the cross section view of being got along the IV b-IV b line of Fig. 4 (a); With

Fig. 5 (a) and 5 (b) are that major component: Fig. 5 (a) that a kind of overrunning clutch as one the 3rd embodiment of the present invention is shown is the partial cut away side views of amplifying, and Fig. 5 (b) is the cross section view of being got along the V b-V b line of Fig. 5 (a).

Fig. 1 (a) and 1 (b) illustrate a kind of overrunning clutch as one embodiment of the invention, and Fig. 1 (a) is a partial cut away side views, and Fig. 1 (b) is the cross section view of being got along the I b-I b line of Fig. 1 (a).Fig. 2 (a) and 2 (b) illustrate a major component of the clutch of Fig. 1 (a) and 1 (b); Fig. 2 (a) is the partial cut away side views of amplifying, and Fig. 2 (b) is the cross section view of being got along the II b-II b line of Fig. 2 (a).Fig. 3 illustrates a permanent magnet generator and starting motor and the cross-sectional front view of the overrunning clutch that uses between them.

In the present embodiment, overrunning clutch of the present invention is to interrelate with permanent magnet motor and starting motor and be directly connected on the motor engine.That is to say that overrunning clutch 30 comprises the inner 31 and clutch Outsides 33 of clutch, the two all is arranged in inside and outside by respectively and mutual concentric type.Clutch inner 31 and starting motor interlocking, and clutch Outside 33 is directly connected on the permanent magnet motor.

As shown in Figure 3, permanent magnet generator 20 rotor 21 is directly connected on the external part of a bent axle 12 that stretches out from the sidewall 11 of engine 10.The intermediate portion of this bent axle 12 is by the clutch inside 31 of roller bearing 32 rotatably support overrunning clutchs 30.

The rotor 21 of permanent magnet generator 20 has a bar 22, and this bar forms a short cylindrical shape with diapire.On the interior periphery surface of this bar, one group of magnet 23 is fixed with certain spacing on a circumferencial direction, is used to provide field pole.In the diapire of bar 22, arrange concentric with this bar 22 and be fixed thereon an axle bush member 24.This axle bush member 24 is incorporated on the bent axle 12 by their tapering with a bond, and further uses a screw.In the inside of this bar 22, laid an armature 25.This armature 25 is by 13 supportings of the hood on the sidewall 11 that is fixed to engine 10.Inside at this hood 13 forms a sealing chamber 14.

An output shaft 16 of starting motor 15 is inserted in this sealing chamber 14.A drive sprocket 17 is fixed on the output shaft 16.Drive sprocket 17 is connected on the driven sprocket 18, utilizes a chain 19 that driven sprocket 18 is fixed on the clutch inside 31.At this moment, drive sprocket 17 and driven sprocket 18 interlockings.

The clutch Outside 33 of overrunning clutch 30 comprises that one is utilized cold forging to become to have columniform integrally formed clutch main body 34.The cylinder type hollow part of clutch Outside 33 is as mounting hole 35 usefulness that are used for clutch inside.This clutch inside 31 utilizes bent axle 12 rotatably supports, and it is attached in the mounting hole 35 rotationally.In Fig. 1 and 2, the line of a kind of hypothesis of inner 31 usefulness of clutch illustrates.

Shown in Fig. 1 (b), the office, an end of the mounting hole 35 of clutch main body 34 on bar one side, with these mounting hole 35 concentric types and whole form a sleeve 36A, the round pool shape that sleeve is slotted and become to have a constant depth.Sleeve part 36A combines with the jack part 36B of axle bush member 24 with a kind of form of socket joint, and this jack part 36B forms on the outer periphery of an outer end portion of bar diapire.This sleeve connection assurance clutch Outside 33 aligns with rotor 21.Place, an arbitrfary point on the circumferencial direction of clutch main body 34, pressured type inserts a locating stud 37 in the axial direction.This locating stud 37 is inserted in the positioning hole 38 of being opened in bar 22 diapires, and its guarantees between rotor 21 and the clutch Outside 33 relative positioning on their circumferencial direction.Clutch main body 34 is fixed on the diapire of bar 22 with one group of bolt 39, simultaneously main body 34 is connected to the sleeve Connecting format on the axle bush member 24 of rotor 21 of permanent magnet generator 20.

Circumferential surface at the mounting hole 35 that is used for clutch inside, the end office relative with sleeve part 36A, be formed with three clutch chamber 40 with the spacing that equates on a circumferencial direction, each clutch chamber is all by the fluting wedgewise, and in the axial direction towards the outside.Each clutch chamber 40 is all laid a clutch roller 43 with a kind of rotary way.Each clutch chamber 40 forms wedge shape, and its integrated type has a small diameter portion 41 and a major diameter part 42, and these two-part have from the different distance in the center of the mounting hole 35 that is used for clutch inside.When clutch roller 42 was positioned in the small diameter portion 41, it had the jail effect of a kind of wedge between clutch inner 31 and clutch Outside 33.

In clutch main body 34, part place in a small diameter portion 41 of each clutch-adjacent chamber 40, all so have a through hole 44, so as it one with the tangent direction of the mounting hole 35 that is used for clutch inside on pass clutch main body 34 to clutch chamber 40 from the outer surface of clutch main body 34.The internal diameter of this through hole 44 is set the external diameter that is a bit larger tham a spring seat described below.In clutch main body 34,, be formed with a receiving hole 45 that is used for spring extending axially on the part of through hole 44 at major diameter part 42 places of each contiguous clutch chamber 40.Each receiving hole 45 that is used for spring all forms an incision through hole 44 and the blind hole on the extension of this through hole 44.The bottom that is used for a receiving hole 45 of spring forms a receiving part 46, and this connects inhales the reaction force that part receives spring described below.

In each receiving hole 45, all insert a spring 47 from clutch chamber 40, and an insertion end, just, in by the formed receiving part 46 in receiving hole 45 bottoms, be received towards an end of spring 47 reaction forces one side.End towards spring 47 biasing sides covers at the columniform spring seat 48 with bottom with one.The spring 47 always end wall of the sealing by spring seat 48 is pushed down clutch roller 43.That is to say that spring 47 receives from the receiving part 46 as receiving hole 45 bottoms, that is a direct reaction force from clutch main body 34.Therefore its elastic force always is partial to small diameter portion 41 with clutch roller 43 from major diameter part 42 in clutch chamber 40.

The outside of clutch main body 34 end surfaces on 22 opposites from the outer periphery to the bar entirely covers with a clutch cover 49.The end portion of clutch cover 49 on bar 22 1 sides bent, and clogs the outer periphery part of clutch main body 34 on bar 22 these sides.Thereby the opening and the through hole 44 of each clutch chamber 40 all blocked by a clutch cover 49 in the outer periphery of clutch main body 34.

Below, explanation is used to make the permanent magnet motor that is directly connected on the motor and the operation of the crew-served overrunning clutch of starting motor.

When operation starting motor 15 was used to make motor 10 entrys into service, a rotating force of the output shaft 16 of starting motor 15 was transported on the clutch inside 31 by drive sprocket 17, chain 19 and driven sprocket 18.When clutch inner 31 press arrow directions X rotation shown in Fig. 1 (a), clutch roller 43 rotated up to having wedge towards the small diameter portion of clutch chamber 40.As a result, clutch Outside 33 is pressed the direction rotation of arrow X along with the rotation of clutch inside 31.A rotating force of clutch Outside 33 is transported on the bent axle 12 by the rotor 21 of permanent magnet generator 20, so that motor 10 entrys into service.

After motor 10 entrys into service and when revolution increases, clutch Outside 33 is to rotate than clutch inside 31 higher speed.From relative viewpoint, it is identical by the state that rotates in the opposite direction with aforementioned side with clutch inside 31, and clutch roller 43 is moved towards major diameter part 42 by the bias force of antagonistic spring 47.As a result, the engagement between clutch inner 31 and the clutch Outside 33 is released, becomes the state that bent axle 12 is thrown off starting motor 15 rotations.

According to present embodiment, the end on reaction force one side of the spring 47 that receives in receiving hole 45 is received in the bottom that receiving part 46 just is used for the receiving hole 45 of spring.Therefore, opposite with stopper commonly used, pressurization is inserted but is not unclamped, and the end position on reaction force one side of spring 47 can displacement.Thereby spring 47 can always keep a given spring force, and can be with this given spring force biasing clutch roller 43.

In addition, as a kind of consequent, the situation that a stopper moves in the through hole that receives spring owing to the getting loose of pressurization insertion of this stopper can not appear.Thereby can not go out phenomenon causes irregular sound owing to stopper moves problem.In addition, also such result can not occur, promptly when clutch roller 43 reversed owing to the recoil moment of motor, stopper was because of receiving to deviate from from the vibrations of spring seat 48.

Opposite with technology commonly used in addition, needn't insert stopper by pressured type, so being controlled on its strict degree of dimensional accuracy can alleviate.That is to say, with regard to the internal diameter of the receiving hole 45 that is used for spring, consider that the external diameter of spring 47 and spring seat 48 is just enough, therefore and the situation of pressurization insertion stopper compare, alleviated the control of dimensional accuracy greatly.Also have, as a kind of consequent, can exempt the process that stopper is inserted in pressurization, it and the strict degree that alleviates dimensional accuracy control greatly reduce the cost of production of overrunning clutch together.

Fig. 4 (a) and 4 (b) illustrate a major component as the overrunning clutch of the second embodiment of the present invention; Fig. 4 (a) is the partial cut away side views of amplifying, and Fig. 4 (b) is a cross section view of being got along the middle IV b-IV b line of Fig. 4 (a).

This second embodiment below 2 go up different with above-mentioned first embodiment.At first, open an intercommunicating pore 50 in the bottom of the receiving hole 45 that is used for spring, to pass clutch main body 34 to the outer periphery of clutch main body 34, this bottom has receiving part 46, it circularizes in the outer periphery of staying intercommunicating pore 50, can be interconnected for use in the inside of the receiving hole 45 of spring and the outside of clutch main body.Secondly, in position, aperture 51 and 52 in clutch cover 49, have been opened respectively corresponding to through hole 44 and intercommunicating pore 50.

In this second embodiment, when the engine oil (not shown) was flowed through sealing chamber 14 shown in Fig. 3, engine oil can freely pass in and out clutch chamber 40 and be used for the receiving hole 45 of spring.The mobile stationarity that can keep as a result, clutch roller 43, spring 47 and spring compressor 48.If in an embodiment of an employed overrunning clutch 30, do not open intercommunicating pore 50, but immerse engine oil at the place, bottom of the receiving hole 45 that is used for spring, then the flowability of the engine oil that exists on major diameter part 42 1 sides of clutch chamber 40 is very low.As a result, the mobile stationarity of clutch roller 43, spring 47 and spring compressor 48 reduces.On the other hand, when the intercommunicating pore 50 of opening was opened, the engine oil on major diameter part 42 1 sides of clutch chamber 40 can freely pass in and out by intercommunicating pore 50, thereby had guaranteed the mobile stationarity of clutch roller 43, spring 47 and spring compressor 48.

Fig. 5 (a) and 5 (b) are the major components that a kind of overrunning clutch as the third embodiment of the present invention is shown; Fig. 5 (a) is the partial cut away side views of amplifying, and Fig. 5 (b) is the cross section view of being got along the V b-V b line of Fig. 5 (a).

This 3rd embodiment and above-mentioned first embodiment's difference are that a short cylindrical shape spring seat 53 is connected to spring 47 on the outer periphery, end on receiving hole 45 1 sides, and spring 47 is inserted in the receiving hole 45, and are connected with spring seat 53.That is to say that spring seat 53 is formed a kind of cylinder form of weak point, the one end is plugged, and its internal diameter and external diameter equal the internal diameter and the external diameter of spring compressor 48 basically respectively.The internal surface of an end that is plugged of spring seat 53 is received in the spring 47 on itself and spring compressor 48 those side opposite end.In addition, spring seat 53 outer surface blocking end receiving part 46 contacts of being pasted receiving hole 45.And the length of spring seat 53 is so set, so that it and spring compressor 48 length total length together are shorter than the degree of depth of receiving hole 45.That is to say that the length of setting spring seat 53 like this and spring compressor 48 is so that allow spring 47 compressive strains.The obstruction wall of spring seat 53 has the aperture 53a that a concentric type is opened.

Get back to Fig. 1 now, embodiment shown in 2 and 4, in these embodiments wherein among each embodiment, it should be noted that, in the bottom of receiving hole 45 is divided, be formed with a small diameter portion, it has an internal diameter that is substantially equal to spring 47 external diameters, is used to guarantee alignment between spring 47 and the receiving hole 45.This small diameter portion should be made on receiving hole 45 separately, and therefore, the man-hour and the cost that are used for work increase together.In addition,, in the insertion opening of this small diameter portion, provide a tapering part to form an angle of attack, therefore further increased cost of production by chamfering owing to must allow the end of spring enter the inside of small diameter portion.Even form at the insertion opening of small diameter portion under the situation of tapering part,, also be difficult to meet the state that is not inserted into just in case the end of spring is caught by a hangnail or analog and do not inserted small diameter portion.In addition, when clutch roller 43 under the counter-rotating torque, spring compressor 48 may consistently hit in the tapering part of the part of receiving hole 45 medium-small diameter into, so that because concentrated stress causes to produce in spring compressor 48 is out of shape or damage.

On the other hand, in this 3rd embodiment, guarantee spring 47 and receiving hole 45 alignment in the receiving hole 45 by spring 47 is inserted, and covered with spring seat 53 in the end of receiving hole 45 these side upper springs 47.That is to say, insert receiving hole 45 this simplified assembling, just can reach the highi degree of accuracy alignment between spring 47 and the receiving hole 45 by the spring seat 53 that will cover spring 47.Therefore, cost of production can reduce, and has improved the quality of product simultaneously.In addition, because can exempt the small diameter portion that is used to align in receiving hole 45 bottoms, thus can reduce the man-hour of work, and can further reduce production costs.In addition, done the time spent when clutch roller 43 for example suppresses, hit in the spring seat 53 on 48 one-tenth planes of spring compressor.Thereby therefore the stress in the time of can alleviating collision avoided the distortion and the damage of spring compressor 48 and spring seat 53 simultaneously.Tube, the alignment accuracy between spring 47 and the receiving hole 45 and the performance of overrunning clutch can improve, and cost of production reduces greatly.

The invention that the present inventor finished has been provided detailed description with reference to some embodiments above.But the present invention should be not limited to the foregoing description, but can do various modifications in the scope that does not break away from main points.

For example, spring compressor 48 can be removed.Under the sort of situation, many parts, machining period and assembling man-hour, and cost can reduce.

In a second embodiment, intercommunicating pore 50 needn't be at the bottom split shed of the receiving hole 45 that is used for spring, and can be at the sidewall split shed.

As mentioned above,, suitably keep the bias force of a spring, and can alleviate the strict degree of dimension precision requirement according to the present invention.

Claims

1. overrunning clutch, it comprises the inner and clutch Outside of a clutch, their also mutual respectively concentric types are arranged in the inside and outside, this clutch Outside comprises: a main body, it has the mounting hole of an installation clutch inside, and clutch is connected internally in this mounting hole; One group of clutch chamber, they are located at an interior periphery surface of the mounting hole that is used to install clutch inside, form with the spacing that equates on a circumferencial direction; Each chamber all has wedge slot, in the axial direction towards the outside; One group of clutch roller, they are placed in separately the clutch chamber rotationally; With one group of spring, each spring all makes one of them clutch roller be partial to the small diameter portion of each clutch chamber, wherein:

This side place of each described clutch chamber major diameter part all forms a receiving hole that is used for spring therein, described receiving hole one with the tangent direction of the described mounting hole that is used for clutch inside on slot, and each described spring all inserts in the receiving hole, so that the spring reception is from the reaction force of the receiving part of a bottom of receiving hole; And the part place of the small diameter portion of each clutch chamber in a described main body of vicinity opens a through hole on the axis extension of the receiving hole that is used for spring accordingly.

2. the overrunning clutch described in the claim 1 is characterized in that, opens an intercommunicating pore in described receiving hole, so that an outside of the inside of described receiving hole and described main body is interconnected.

3. the overrunning clutch described in the claim 1 is characterized in that, described spring is inserted in the receiving hole, and columniform spring seat is connected on the end portion of a side upper spring of described receiving hole.