CN102828812A

CN102828812A - Water pump

Info

Publication number: CN102828812A
Application number: CN2012100494411A
Authority: CN
Inventors: 村上信吾; 渡边正彦; 中村英昭
Original assignee: Hitachi Automotive Systems Ltd
Current assignee: Hitachi Astemo Ltd
Priority date: 2011-06-14
Filing date: 2012-02-29
Publication date: 2012-12-19
Anticipated expiration: 2032-02-29
Also published as: CN102828812B; US20120321489A1; DE102012209687A1; JP2013002499A; JP5563525B2

Abstract

The invention provides a water pump. Through removing water held in a seal unit, the seal unit can be effectively used. The seal unit is disposed between sealing elements and an oil slinger. The water pump (1) comprises a sealed bearing (6), and the annular oil slinger (7) configured on opposite of a side of the bearing (6). The bearing (6) is a rotating member formed by a belt wheel, a drive shaft connected with the belt wheel, and vane wheels. The water pump is provided with a first sealing portion (S1) formed by a second bearing sealing (20) of the bearing (6).In the water pump (1), the oil slinger (7) is fixed on periphery of a housing (2) which is as a non-rotating object. In addition, the water pump (1) comprises a second sealing portion (S2) which is closer to the periphery than the first sealing portion (S1), and the second sealing portion (S2) slidably contacts with an outer ring (17) of the bearing (6).

Description

Water pump

Technical field

The present invention relates to a kind of water pump, particularly relate to the waterproof construction of a kind of bearing of rotating body for supporting in this water pump, said water pump is applicable to the engine cooling apparatus of Motor Vehicle for example etc. and is used for the circulation of the cooling water in this cooling unit.

Background technique

At this, as the bearing waterproof construction of existing water pump, the known content that has for example following patent documentation 1 to be put down in writing.

Promptly; In the bearing waterproof construction of this water pump; Because the sidepiece of the ball bearing of the disc of ring-type and multiple row formula, band sealing is in abutting connection with configuration; Between the live axle that the pump case cylindraceous that is installed in the ball bearing of this multiple row formula, band sealing disposes with interior all sides of this cylindric pump case of insertion; The disc of this ring-type owing to rotate integratedly with live axle with the sealed member sliding contact of the axial end portion that is positioned at said bearing; Through the inner ring that makes first lip that is arranged at the sealed member front end and said bearing is that the peripheral part Elastic Contact of live axle main body constitutes first sealed department, in addition, and in the intrusion path that flows to the inner water of bearing, more lean on the position of front side (outside) to be provided with second sealed department than said first lip; This second sealed department constitutes with the outer side surface Elastic Contact of disc through making outstanding second lip that is arranged at the lateral part of sealed member, utilizes two sealed departments that constitute above-mentioned dual structure to prevent that moisture from invading bearing inside.

Patent documentation: (Japan) spy opens the 2010-169143 communique

But, in the waterproof construction of the bearing of said existing water pump,, so cause many moisture retentions in this annular slot because second lip of sealed member forms annular slot with the disc butt between above-mentioned two parts.Therefore, cause this occluded water to divide and flow through second sealed department easily, thereby can not effectively utilize this second sealed department, and moisture might be invaded bearing inside.

Summary of the invention

The present invention makes in view of the actual conditions of said existing water pump, and purpose is, a kind of water pump is provided, and it effectively uses sealing portion through removing the moisture that is trapped in sealed department, and sealing portion is formed between sealed member and the disc.

The invention of first aspect relates to a kind of water pump; It is characterized in that; Comprise: driver part, its constitute possess owing to the belt wheel that comes power to rotate from the driving source transmission, with this belt wheel integratedly drive shaft rotating, be arranged at the impeller of said live axle with mode with the rotation of this live axle one; Housing, its formation disposes at least a portion of the pump chamber of said impeller, is provided with the mode of the outer circumferential side that surrounds said live axle; Mechanical seal, it is installed between said housing and the said live axle, prevents that the interior cooling water of said pump chamber is to external leaks; Bearing; It is configured in outside the said pump chamber, the opposing party's inner ring in the relative rotary part that constitute the outer ring that possesses a side in the relative rotary part that is fixed in said driver part and said housing, is fixed in said driver part and said housing, is installed in the rotor between said outer ring and the inner ring; Bearing seal, the axial at least end that it is configured in said bearing is fixed on the side in said outer ring and the inner ring, and have with said outer ring and inner ring in the sealing lip of ring-type of the opposing party's slide relative; Disc, itself and said bearing seal are disposed relatively, with respect to comprising said driver part and being fixed in the said outer ring of this driver part and the solid of rotation of inner ring is fixed on the said housing slidably.

The invention of second aspect is on the basis of first aspect invention, it is characterized in that, said disc constitutes and can slide with respect to the outer ring and the said belt wheel of said bearing.

The invention of the third aspect is on the basis of first aspect invention, it is characterized in that, said disc slides via the outer ring or the said belt wheel of rubber-like rubber material with respect to said bearing.

The invention of fourth aspect is on the basis of third aspect invention, it is characterized in that said rubber material is arranged on the said disc.

The invention of the 5th aspect is on the basis of first aspect invention, it is characterized in that, said disc constitutes with respect to said bearing seal and slides.

The invention of the 6th aspect is on the basis of first aspect invention, it is characterized in that at least a portion of said disc is formed with solid lubricant film, is formed with this and fixedly constitutes outer ring and the slip of said belt wheel with respect to said bearing in the position of lubricating film.

The invention of the 7th aspect is on the basis of invention aspect the 6th, it is characterized in that said disc constitutes can resiliently deformable.

The eight aspect invention is on the basis of first aspect invention; It is characterized in that; Said disc is clipped in the axial end of said bearing and is arranged between the stepped part of said housing; Annular recessed portion run through the stepped part that is arranged on said housing, with the relative position of interior all side edge of said disc, and avoid this ora terminalis.

The invention of the 9th aspect relates to a kind of water pump; It is characterized in that; Comprise: driver part, its constitute possess owing to the belt wheel that comes power to rotate from the driving source transmission, with this belt wheel integratedly drive shaft rotating, be arranged at the impeller of said live axle with mode with live axle one rotation; Housing, its formation disposes at least a portion of the pump chamber of said impeller, is provided with the mode of the outer circumferential side that surrounds said live axle; Mechanical seal, it is installed between said housing and the said live axle, prevents that the interior cooling water of said pump chamber is to external leaks; Bearing; It is configured in outside the said pump chamber, the opposing party's inner ring in the relative rotary part that constitute the outer ring that possesses a side in the relative rotary part that is fixed in said driver part and said housing, is fixed in said driver part and said housing, is installed in the rotor between said outer ring and the inner ring; Disc, it is configured in from the said path that is mechanically sealed to said bearing, with respect to comprising said driver part and being fixed in the said outer ring of this driver part and the solid of rotation of inner ring is fixed on the said housing slidably.

The invention of the tenth aspect relates to a kind of water pump, it is characterized in that, comprising: solid of rotation, and it utilizes from the next power of driving source transmission and rotates; Housing, it constitutes at least a portion of pump chamber, and this pump chamber makes the cooling water circulation of internal-combustion engine through the rotation of said solid of rotation; Mechanical seal, it is installed between said housing and the said solid of rotation, prevents that the interior cooling water of said pump chamber is to external leaks; The band stuffing box bearing, it is configured in the outer said solid of rotation of said pump chamber and the relative rotary part of said housing; Disc, it is configured in the axial at least distolateral of said bearing, and is fixed in non-rotary part, with respect to said solid of rotation slidably.

According to the present invention, be delivered to disc by the heat of the cooling water of motor heating via housing, thereby can make near the water evaporation of slide part that is trapped in disc and solid of rotation fast and remove moisture.Consequently, can prevent the inner unfavorable condition that is caused of moisture intrusion bearing as much as possible, that is, prevent the breakage of bearing.

Description of drawings

Fig. 1 is the exploded perspective view of water pump of the present invention.

Fig. 2 is the plan view of water pump shown in Figure 1.

Fig. 3 is the A-A line sectional drawing of Fig. 2 of expression first mode of execution of the present invention.

Fig. 4 is the major component enlarged view of Fig. 2 of first mode of execution.

Fig. 5 is the longitudinal sectional drawing of disc monomer of other distortion of the sealing configuration parts of expression first mode of execution.

Fig. 6 is the longitudinal sectional drawing of disc monomer of other distortion of the sealing configuration parts of expression first mode of execution.

Fig. 7 is the synoptic diagram that is equivalent to Fig. 4 of the variation of first mode of execution.

Fig. 8 is the synoptic diagram that is equivalent to Fig. 4 of second mode of execution of the present invention.

Fig. 9 is the synoptic diagram that is equivalent to Fig. 4 of the 3rd mode of execution of the present invention.

Description of reference numerals

1 water pump

2 pump case (housing)

3 live axles

4 belt wheels

6 bearings

8 impellers

10 mechanical seals

16 inner rings

17 outer rings

18 balls (rotor)

19 clutch shaft bearings sealings (bearing seal)

20 second bearing seals (bearing seal)

Embodiment

Below, describe based on accompanying drawing each mode of execution water pump of the present invention.Need to prove; In following each mode of execution, water pump of the present invention is applicable to and the cooling unit of at present identical engine of motor vehicle that this water pump is configured in the side of cluster engine; And as power source, cooling water is circulated in cluster engine with the rotary driving force of engine crankshaft.

Promptly; Extremely shown in Figure 3 like Fig. 1; This water pump 1 possesses: pump case 2 roughly cylindraceous; Its axial one distolateral cylindrical part 11 with the stepped contraction of diameter owing to the side that is fixed on not shown cluster engine via the lip part 2a that is positioned at the other end, is pump chamber P thereby between pump case 2 and this cluster engine, mark off volute; Live axle 3, it inserts and is configured in interior all sides of this pump case 2 along axial direction; Belt wheel 4, it is fixed on from an end periphery of a distolateral live axle 3 towards the outside of pump case 2, and transmits the rotary driving force of bent axles to live axle 3 via not shown driving belt; Cover 5, the outboard end that it is configured to be fixed on this belt wheel 4 covers the roughly whole outer side surface of this belt wheel 4; Bearing 6, it is installed between the end and belt wheel 4 of pump case 2, and belt wheel 4 is supported in rotation freely; Disc 7, its with the inner side surface of the bearing 6 that exposes to the outside relatively to ground in abutting connection with configuration, prevent that impurity such as moisture from invading the inside of these bearings 6; Impeller 8, it is fixed on from another distolateral periphery of another distolateral live axle 3 in pump chamber P of pump case 2, and rotation is accommodated in the pump chamber P freely.

Said pump case 2 is formed as one by aluminum alloy material casting (aluminium diecasting), and said cylindrical part 11 has: with the large-diameter portion 11a of said lip part 2a in abutting connection with setting; The middle footpath 11b of portion that is connected and is formed at the axial intermediate portion of this cylindrical part 11 with this large-diameter portion 11a; Minor diameter part 11c, its constitute via stepped part 11d with should in the 11b of footpath portion be connected, dwindle gradually towards the forward end internal diameter of this cylindrical part 11.Bottom at the middle footpath 11b of portion is provided with drip chamber 12, and the lower end through latch 9 sealing drip chambers 12 marks off this drip chamber 12, and this drip chamber 12 via after the weep hole 13 stated with should in the 11b of footpath portion internal communication.

The 11b of footpath portion in said; Live axle 3 is relative with large-diameter portion 11a; Between the outer circumferential face of the end inner peripheral surface of large-diameter portion 11a side and this live axle 3, well-known mechanical seal 10 is installed, utilizes this mechanical seal 10 to prevent intrusion from the cooling water of pump chamber P side.But; Because only utilize this mechanical seal 10 can not prevent intrusion fully from the cooling water of pump chamber P side; So at the lower position of the Vertical direction of the perisporium of the middle footpath 11b of portion, run through along the Y direction among Fig. 3 and to be formed with the inner space that is communicated with the 11b of footpath portion in this and the weep hole 13 of drip chamber 12, utilize this weep hole 13; With said mechanical seal 10 fail to stop and in flowing into the cooling water in the 11b of footpath portion discharge to drip chamber 12, thereby make this cooling water can not flow to minor diameter part 11c side.And; In this on perisporium of 11b of footpath portion, in the position relative with said weep hole 13, along the Y direction among Fig. 3 run through be formed with connection should in intercommunicating pore 14 inside and outside 11b of footpath portion (pump case 2); Utilize this intercommunicating pore 14, the cooling water that will in drip chamber 12, evaporate is discharged to the outside.

Said live axle 3 is formed by steel, the one of which end from an end of pump case 2 towards the outside, its other end from the other end of pump case 2 towards the outside.In addition, at this live axle 3, more leaning on distolateral and corresponding with said weep hole 13 and intercommunicating pore 14 axial position than the chimeric mounting point of mechanical seal 10, the edge circumferentially is provided with the grooving 3a of the ring-type of the axial width with regulation.Through such grooving 3a is set, can through this grooving 3a stop cross said mechanical seal 10 flows in the cooling water in the 11b of footpath portion, along the mobile cooling-water flow of the outer circumferential face of live axle 3.That is, when the cooling water from pump chamber P effluent to the outer circumferential face of live axle 3 flows into grooving 3a, utilize the stepped part of belt wheel 4 sides of this grooving 3a to stop this cooling water, thereby utilize this grooving 3a to prevent this cooling water flowing to belt wheel 4 sides.

Said belt wheel 4 is through steel plate is carried out punch process and integrated roughly cylindric, and said belt wheel 4 has: cylinder base portion 4a, and it is first cylindrical part that the round-ended cylinder shape is arranged that constitutes around the minor diameter part 11c of pump case 2; The driving belt coiling 4b of portion, its extension is arranged on the outer circumferential side of this tubular base portion 4a, is second cylindrical part that is connected with said bent axle through reeling said driving belt in its periphery; Axle fixing part 4c, its central part at said tubular base portion 4a forms from the pump case 2 side direction outside along the axial direction depression, is used for fixing live axle 3.Through said axle fixing part 4c is pressed into an end periphery of live axle 3, and be fixed on this live axle 3.At this; Said tubular base portion 4a is made up of bearing support 4d and end wall 4e; Wherein, Said bearing support 4d intercalation is in the periphery of bearing 6 and support this bearing 6 and be rotated, and said end wall 4e is provided with and disposes relatively with the outer side surface of bearing 6 through extending towards radially inner side from the external end edge of this bearing support 4d, and links this a bearing support 4d and an axle fixing part 4c; After bearing 6 (outer ring 17) is pressed into the interior week of said bearing support 4d, through this bearing 6 (inner ring 16) is pressed into the periphery of the minor diameter part 11c of pump case 2, thereby be assembled on the pump case 2.

In addition; End wall 4e at said belt wheel 4; Circumferentially roughly equally spaced be formed with a plurality of tap holes 15 along the perforation of the X-axis direction among Fig. 3, a plurality of these weep holes 15 are used for the aforesaid cooling water of crossing in the mechanical seal 10 inflow minor diameter part 11c from pump chamber P side is discharged.Above-mentioned each tap hole 15 constitutes the position that clutch shaft bearing sealing 19 that its at least a portion is opened in than is arranged at bearing 6 and the contacting part of inner ring 16 more lean on outer circumferential side; Thereby make the cooling water that flows in the said minor diameter part 11c as water vapour before arriving said clutch shaft bearing sealing 19, discharge to the outside through this tap hole 15 respectively.Particularly, because a plurality of above-mentioned each tap hole 15 are set, therefore can discharge the cooling water in the said pump 1 expeditiously.And, because said each tap hole 15 is arranged on the radial position relative with the inner ring of bearing 6 16, therefore can insert not shown jig, to be used for that inner ring 16 is pressed into minor diameter part 11c via above-mentioned each tap hole 15.

Said cover 5 is the stamping forming roughly tubulars of regulation metallic material that had corrosion resistance by aluminium or stainless steel etc., and said cover 5 constitutes and has: from the covering part 5a of the tubular base portion 4a of outer side covers belt wheel 4; Fixing part 5b, it is arranged to cylindricly at the central part of this covering part 5a along axial direction is outstanding, and is used for fixing belt wheel 4, and the periphery of the axle fixing part 4c through said fixing part 5b being pressed into belt wheel 4 is fixed on this belt wheel 4.As stated; The axle fixing part 4c butt of the inner circumference edge of this cover 5 and belt wheel 4; In addition; The outer periphery of this cover 5 extend to the position near the inner peripheral surface of the driving belt coiling 4b of portion of belt wheel 4 because this cover 5 constitutes the outer side surface of roughly whole this belt wheel 4 of covering, therefore can avoid impurity such as rainwater from the outside through the direct unfavorable condition such as arrival bearings 6 of said each tap hole 15.

Said bearing 6 is single-row ball bearings of so-called band sealing, is installed between the inner peripheral surface of outer circumferential face and bearing support 4d of minor diameter part 11c, and said bearing 6 constitutes to have: the outer circumferential face and the fixing inner ring 16 that are pressed into minor diameter part 11c; Be pressed into inner peripheral surface and the fixing outer ring 17 of bearing support 4d; Ball 18, it is to utilize a pair of maintenance groove positioned opposite to each other and remain on inside and outside circle 16, the rotor between 17; First, second bearing

seal

21,22, its respectively riveted fixing in the outer ring 17 two end part inner circumference edge, and blocking-up Internal and

external cycle

16,17 radially between divide being communicated with of the tubular space portion that forms and outside.For this bearing 6; The clutch shaft bearing sealing 19 that utilization is equipped on its axial end prevents that therefrom the 11b of footpath portion flows into these bearing 6 inside of moisture intrusion in the minor diameter part 11c; In addition; Distolateral at another of this bearing 6, utilize second bearing seal 20 and prevent in abutting connection with the disc 7 of configuration that with this second bearing seal 20 impurity such as said moisture from invading these bearing 6 inside from the outside etc.

At this; Because said first, second bearing seal 19,20 constitutes same structure; So detailed structure is described for ease, only second bearing seal 20 is described, particularly as shown in Figure 4; This second bearing seal 20 mainly is made up of plug 20a and sealing lip 20b; Wherein, said plug 20a is embedded in the inside of rubber material of the peripheral end (base end part) of this second bearing seal 20, and said sealing lip 20b can be arranged on to elastic strain interior all ends (front end) of this second bearing seal 20; Interior all side edge Elastic Contact of the other end through making sealing lip 20b and inner ring 16 (end relative with disc 7) constitute the first sealed department S1, utilize this first sealed department S1 to prevent that impurity from invading bearing 6 inside.Need to prove that this first sealed department S1 is the double sealing structure through two first, second lip 20d constituting said sealing

lip

20b, 20e are constituted with the inner circumference edge Elastic Contact of the other end of inner ring 16 respectively.

Said disc 7 constitutes to have: disc main body 21, and it is by form circular of the higher regulation metallic material of thermal conductivity ratio such as for example aluminum alloy material and can be elastically-deformable lamellar; Lip structure 22; It covers outer circumferential side part of this disc main body 21 and is provided with, and is provided with sealing lip 23 in that the lateral part of said lip structure 22 is outstanding, and said disc 7 is set to; Perimembranous is fixed on the periphery of minor diameter part 11c in it; In addition, its outer periphery extend to the position near the inner peripheral surface of the bearing support 4d of belt wheel 4, rainwater that flows directly into from the outside etc. or can invade from the opening portion that exposes of bearing 6 via the cooling water that said intercommunicating pore 14 is discharged; Owing to the opening portion that exposes of said disc 7 these bearings 6 of sealing disposes, prevent that therefore moisture such as said rainwater from directly arriving the unfavorable condition (with reference to Fig. 3) of bearing 6.More particularly; The chimeric outer circumferential face that is installed in the minor diameter part 11c of pump case 2 of the interior perimembranous 21a of said disc main body 21; And to be fixed on the pump case 2 by the mode of the inner ring 16 of bearing 6 with the stepped part 11d clamping vertically of pump case 2; With the mode left from bearing 6 vertically the peripheral part of this crooked disc main body 21, mainly face outside scope and be in the state that is covered by lip structure 22, the axial clearance C2 that is formed at based on this skew shape between bearing 6 and the disc 7 is sealed by sealing lip 23.

At this, adopt the fixed structure of above-mentioned disc 7, run through being provided with along circumferential ring-shaped continuous recess 24 in the interior perimembranous of the stepped part 11d of pump case 2, the smooth outer circumferential face of minor diameter part 11c constitutes and extends in the annular recessed portion 24.Thus, usually, for the ease of processing; The boundary portion of minor diameter part 11c and stepped part 11d forms the curved surface shape mostly, with disc main body 21 when stepped part 11d pushes, perimembranous 21a (inner peripheral surface) is shelved on said curved boundary portion in it; Thereby produce the problem that perimembranous 21a in this can not closely contact with the side of stepped part 11d, still, in this mode of execution; The inner circumference edge that leaves disc main body 21 owing to annular recessed portion 24 forms; Therefore, because as stated, the smooth outer circumferential face of minor diameter part 11c constitutes continuously to annular recessed portion 24; So the interior perimembranous 21a of disc main body 21 is closely contacted with the side of stepped part 11d, thereby can guarantee well and suitably to install disc 7.Consequently, in the state after assembling, disc 7 can not produce and rock, and can avoid following this to rock and produce bad.

In addition; Said sealing lip 23 is set its elongation and bearing of trend according to this position deflection all the time in the scope of the axial position skew that produces bearing 6; Even be under the outer side surface situation farthest of disc 7 in outer ring 17, the front end of said sealing lip 23 also with the other end Elastic Contact (with reference to the dotted line among Fig. 4) of outer ring 17.Thus, when pump drives, can bring into play to all-the-time stable the effects such as waterproof of the said second sealed department S2.

Thus; In said water pump 1,, also still there is intrusion path from the radial clearance C1 between this disc 7 and the belt wheel 4 to the moisture such as said rainwater of the inside of bearing 6 even dispose said disc 7; Wherein, Except the first sealed department S1 of second bearing seal 20 of the end that is arranged at bearing 6, and, form dual thus (if regard as first sealed department dual more the second sealed department S2 of the sealing lip 23 of disc 7 being set by inlet (as the radial clearance C1 of the inflow entrance of moisture etc.) side than the first sealed department S1 in this intrusion path; Then be triple) sealing configuration, thereby prevent that as far as possible moisture etc. from invading the inside of bearings 6.

To shown in Figure 3, said impeller 8 passes through the steel plate punch process is shaped integratedly, and has: form roughly discoideus base portion 8a like Fig. 1; A plurality of blade part 8b, it cuts the outer circumferential side of steel plate respectively and it is formed to axial bending at the circumferential assigned position of this base portion 8a; Axial region 8c, its central part at said base portion 8a cave in from the said cluster engine side of pump case 2 side direction along axial direction and form tubular, through said axial region 8c being pressed into the periphery of the other end of live axle 3, and are fixed on this live axle 3.

Below, based on Fig. 4 the special action effect of the water pump 1 of this mode of execution is described.

At first; Even the structure of said water pump 1; Also because belt wheel 4, bearing 6 and disc 7 form no small space portion SP1 near the said second sealed department S2; Therefore same with existing technology, possibly cause flowing through said intercommunicating pore 14 and the cooling water of discharging or be trapped in this space portion SP1 from the rainwater of outside etc.

Therefore; Under the situation of said water pump 1; When said water pump 1 drives; Make with the solid of rotation headed by the belt wheel 4 of transferring power with respect to as the pump case 2 of non-rotary body, chimeric inner ring 16 and disc 7 rotations that are installed on the bearing 6 of pump case 2, this solid of rotation also comprises the outer ring 17 of the live axle 3, impeller 8 and the bearing 6 that link with belt wheel 4 etc., as the sealing lip 23 of the disc 7 of said non-rotary body all the time with outer ring 17 sliding contacts as said solid of rotation.Consequently, thus the frictional heat that can utilize this sliding contacting part to produce is removed the water evaporation that is trapped in the said space portion SP1.Thus, can reduce to be trapped in of the danger of the interior moisture of said space portion SP1 through the second sealed department S2.And; Under the situation of this mode of execution; Because said sealing lip 23 constitutes near the sliding contact outer periphery with outer ring 17, so can guarantee the per unit rotation of corresponding bearing 6, the sliding contact distance of sealing lip 23 is very long; Can produce said frictional heat expeditiously, thereby remove said moisture effectively.

In addition, in the water pump 1 of this mode of execution, also improve the evaporation effect of said moisture through the heat that transmits pump case 2 to disc 7.Promptly; Because the cooling water by water pump 1 force feed is generally used for cooling off the cluster engine that is in high temperature; Because from the heat that this cluster engine is accepted, cooling water is in the state near hot water, so utilize above-mentioned heated cooling water heating to constitute the entire pump housing 2 of pump chamber P; Consequently, this pump case 2 with heat to disc 7 transmission of disposing with the mode butts that closely contacts with this pump case 2.Specifically,, afterwards, conduct heat to conducting heat from pump case 2 from disc main body 21 labiad structural portion 22 with the disc main body 21 that this pump case 2 closely contacts.Thus, also can utilize the heat that is transmitted to make the water evaporation that is trapped in the said space portion SP1, therefore, the effect of water evaporation combined, can further remove the moisture in the space portion SP1 effectively with utilizing said frictional heat.

In addition; Suppose at said moisture through under the situation of the second sealed department S2; Under the situation of this mode of execution; Also can be as stated, because closely contacts and the fixing disc 7 (particularly the disc main body 21) and the inner ring 16 of bearing 6 with this pump case 2, flow into the heat that is formed near said disc main body 21 of the interior water utilization of the space portion SP2 of the first sealed department S1 and inner ring 16 and evaporate so cross the said second sealed department S2 via pump case 2 heating.That is,, also can remove moisture, therefore can reduce as much as possible from the possibility of moisture intrusion bearing 6 inside that said radial clearance C1 invades at the first sealed department S1 even flow through the second sealed department S2.

Need to prove; When through said disc 7 with heat when making water evaporation; Particularly in this mode of execution because heated object is a non-rotary body, so its with heat can not lose because of rotation; Thereby can utilize this heat to evaporate said moisture expeditiously, and remove said moisture effectively.

As stated; Water pump 1 according to this mode of execution; Can utilize moisture that the sealing lip 23 of disc 7 prevents to invade from said radial clearance C1 etc. to bearing 6 side flow, and outer ring 17 sliding contacts of the sealing lip 23 that can utilize disc 7 bearing 6 of rotation with being accompanied by that pump drives and the frictional heat that produces make near the water evaporation the first sealed department S1; In addition; Particularly, by said cluster engine with the heat of cooling water of heat be passed to disc 7 via pump case 2, utilize this to be transmitted heat and also can make and be trapped near the water evaporation the second sealed department S2 and be removed.Consequently, can prevent to invade the unfavorable conditions such as breakage of this bearing 6 that the inside of bearing 6 produces as much as possible owing to moisture.

In addition; Suppose under the situation of moisture through the said second sealed department S2; Under the situation of this mode of execution; Because also can utilize the heat that is passed to as the said disc 7 of non-rotary body to make the water evaporation that flows to the first sealed department S1, invade the inner possibility of bearing 6 so can reduce the moisture of invading from said radial clearance C1 etc. as much as possible.

Need to prove; Particularly under the situation of this mode of execution, can realize the said single-row ball bearing that cost reduces because using the versatility height, so when belt wheel 4 rotations; Compare with the existing technology that adopts said multiple row ball bearing, what cause axle tilts greatlyyer.Therefore; Also flow into more said moisture etc. from said radial clearance C1; Thereby it is higher than existing technology to cause this moisture etc. to flow through the danger of the second sealed department S2, still, and through adopting aforesaid special sealing configuration; Intrusion bearing 6 inside such as said moisture can be avoided, and the reduction of cost can be realized through the generalization of this bearing 6.

Fig. 7 is the variation of water pump 1 of said first mode of execution of expression, constitutes the radially extension along this disc 7 through the sealing lip 23 that makes said disc 7, and makes sealing lip 23 constitute inboard end wall (end walls of the impeller 8 sides) sliding contact with belt wheel 4.

Therefore; Under the situation of this variation; Certainly also play and the identical action effect of said first mode of execution; Because can be with guaranteeing that the sliding contact distance corresponding to the sealing lip 23 of pump per unit rotation is longer, thus the said frictional heat can produce pump more expeditiously and drive the time, thus can more effectively remove near the moisture that is trapped in the second sealed department S2.

And, through the structure of this variation because do not have to form as the space portion SP1 of said first mode of execution, be detained the space of moisture such as said rainwater, so can further reduce the possibility that this moisture passes through the second sealed department S2.

Fig. 8 is the figure of second mode of execution of expression water pump of the present invention; Cancelled the said lip structural portion 22 on the said disc 7; And the lateral part that makes the said sealing lip 23 and second bearing seal 20 is shaped and as second sealing lip 24 integratedly, makes this second sealing lip 24 constitute the outer side surface 7a sliding contact with disc 7 (disc main body 21).

Therefore; Under the situation of this mode of execution; Particularly; Because said second sealing lip 24 directly with disc main body 21 butts that constitute by steel plate, so except the action effect of said first mode of execution, can also utilize the heat that is passed to disc main body 21 from said pump case 2 further to remove effectively to be trapped near the moisture the second sealed department S2.

Fig. 9 is the figure of the 3rd mode of execution of expression water pump of the present invention; In said disc 7; Said lip structural portion 22 and sealing lip 23 have been cancelled; Part (outer periphery portion) at the outer side surface 7a of this disc 7 (disc main body 21) is implemented the dry film coating as solid lubricant film, and makes this film 25 constitute outer ring 17 sliding contacts with bearing 6.Need to prove, when carrying out this sliding contact, because said film 25 itself does not have elasticity, so in this mode of execution, utilize the elastic force of disc main body 21 to make the other end Elastic Contact of said film 25 and outer ring 17, thereby realize this sliding contact.

Therefore; Under the situation of this mode of execution; Particularly, being accompanied by that pump drives during sliding contact, because can improve the wear resistance of the sliding contacting part of said disc 7; So except the action effect of said first mode of execution, good sealing property that can also the said second sealed department S2 of long term maintenance.

The present invention is not limited to the structure of said each mode of execution; For example, also can freely change installation method and the scope of shape, the lip structural portion 22 of the disc main body 21 of disc 7, the shape of sealing lip 23 etc. according to the specification of pump and the vehicle that carries this pump etc.

Specifically; For example said first mode of execution is said; Lip structural portion 22 is through attachings such as bondings and be fixed on the outer circumferential side of disc 7, and is in addition, as shown in Figure 5; Lip structural portion 22 also can constitute and make a plurality of mounting hole 21b run through the outer periphery portion that is formed at disc main body 21, and via each mounting hole 21b the both sides of this lip structural portion 22 is linked.In this case, can lip structural portion 22 be fixed on the disc main body 21 more firmly, thus unfavorable condition such as peeling off of preventing that wearing and tearing owing to this lip structural portion 22 from producing.And as stated, this lip structural portion 22 only is configured in the outer circumferential side of disc 7, and is in addition as shown in Figure 6, also can be set to cover whole disc main body 21.In this case, can prevent that disc 7 from getting rusty, thereby help to improve durability (corrosion resistance).

In addition; Particularly; Can fill the lubricating grease of established amount at the space portion SP1 of first, second mode of execution (as the outer ring 17 of the bearing 6 of the second sealed department S2 and the sliding contacting part of the sealing lip 23 of disc 7); Utilize this lubricating grease to assist to prevent said moisture etc. through the second sealed department S2, in addition, also can improve the friction durability (wear resistance) of sealing lip 23 through this lubricating grease.

And; Though constituting, said each mode of execution is provided with sealing configuration of the present invention, promptly only distolateral at another of bearing 6, at the peripheral part of disc 7 lip structural portion 22 is set; So the outer ring 17 or belt wheel 4 sliding contacts of its subsidiary sealing lip 23 and bearing 6; But, under the situation of the water proofing property of paying attention to this bearing 6, hope distolateral identical sealing configuration to be set also at one of bearing 6.Promptly; Though omit concrete diagram; But; Also preferably said lip structural portion 22 is set, hopes through making the sealing lip 23 and the inner peripheral surface of the driving belt coiling portion 4b of belt wheel 4 and the inner side surface Elastic Contact that be connected the end wall 4f of this driving belt coiling portion 4b and bearing support 4d integrally formed, thereby stop inflow from one of bearing 6 distolateral said moisture etc. with this lip structural portion 22 at the peripheral part of said cover 5.Under the situation of said structure; Because belt wheel 4 and not rotation relatively of cover 5; So of above-mentioned each mode of execution, though can not all remove near the moisture the sealed member,, sealing lip 23 is used to prevent that said moisture etc. from flowing into from radial clearance C3 because being set through frictional heat; Thereby seek further to improve the water proofing property of bearing 6, this radial clearance C3 is formed between the outer circumferential face of inner peripheral surface and cover 5 of belt wheel 4 (the driving belt coiling 4b of portion).

Below, the technological thought beyond the claim of understanding from said each mode of execution is described.

(a) water pump that invention is put down in writing like first aspect is characterized in that,

Said belt wheel has first cylindrical part, the outer ring that is fixed with said bearing interior week of this first cylindrical part, and the inner ring of said bearing is fixed on the outer circumferential face of said housing.

(b) water pump of being put down in writing like said (a) is characterized in that,

Said belt wheel has second cylindrical part at the outer circumferential side of said first cylindrical part.

(c) water pump of being put down in writing like said (b) is characterized in that,

Said first cylindrical part and said second cylindrical part link in the end of said impeller side, and said live axle and said first cylindrical part link in the end of the opposition side of said impeller.

(d) water pump of being put down in writing like said (c) is characterized in that,

The end wall of the said belt wheel that is used to link said first cylindrical part and said live axle, be formed with through hole with the relative position of inner ring of said bearing, the inner ring of said bearing is pressed into the outer circumferential face of said housing.

According to this structure, can make the inner ring of bearing easily be pressed into the periphery of housing via through hole, thereby can guarantee the good assembling operation property of pump.

(e) water pump of being put down in writing like said (d) is characterized in that,

Said belt wheel is fixed on the said live axle as another parts.

(f) water pump that invention is put down in writing like first aspect is characterized in that,

Said disc constitutes with respect to the outer ring of said bearing or said belt wheel and slides.

(g) water pump that invention is put down in writing like first aspect is characterized in that,

Said disc slides via the outer ring or the said belt wheel of rubber-like rubber material with respect to said bearing.

(h) water pump of being put down in writing like said (g) is characterized in that,

Said rubber material is arranged on said disc.

(i) water pump that invention is put down in writing like first aspect is characterized in that,

Said disc constitutes with respect to said bearing seal and slides.

According to this structure, seek to simplify pump structure, and improve assembling operation property and producibility.

(j) water pump that invention is put down in writing like first aspect is characterized in that,

At least a portion at said disc is formed with solid lubricant film, is formed with outer ring or the said belt wheel slip of the position of this solid lubricant film with respect to said bearing.

According to this structure, compare with the situation of using rubber material, can obtain high-durability.

(k) water pump of being put down in writing like said (j) is characterized in that,

Said disc constitutes can resiliently deformable.

Through this structure, can make to be formed with the fixedly position of lubricating film and the outer ring or the suitably sliding contact of belt wheel of bearing.

(l) water pump that invention is put down in writing like first aspect is characterized in that,

Said disc is clipped in the axial end of said bearing and is arranged between the stepped part of said housing, and annular recessed portion runs through stepped part and the relative position of interior all side edge said disc that is arranged on said housing, and avoids this ora terminalis.

According to this structure, make interior all side edge of disc can not be shelved on the root of the stepped part of housing, can suitably be fixed between bearing face and the stepped part side.

(m) water pump that invention is put down in writing like first aspect is characterized in that,

Between the slide part of said sealing lip and said disc, be filled with lubricating grease.

According to this structure, seek to improve the durability of sealing lip.

(n) water pump that invention is put down in writing like first aspect is characterized in that,

Said bearing seal constitutes and is fixed on said outer ring or the inner ring that is fixed in said driver part, and said sealing lip slides on the said outer ring of being fixed in said housing or inner ring.

(o) water pump that invention is put down in writing like first aspect is characterized in that,

Said housing utilizes thermal conductivity ratio with the greatly material forming of said bearing fixing at the parts of said driver part.

Through this structure, can be expeditiously to disc transmit pump (housing) with heat, thereby can promote to be trapped near the said drying effect of the moisture of the slide part of disc and solid of rotation.

(p) water pump of being put down in writing like said (o) is characterized in that,

Said housing is shaped by aluminum alloy material.

(q) water pump that invention is put down in writing like first aspect is characterized in that,

Said bearing is made up of single-row ball bearing.

Under the situation of this structure, to compare with the multiple row ball bearing, axle is prone to, because increase from the leaking of mechanical seal, so the waterproof construction of disc can more effectively work.

Claims

1. a water pump is characterized in that, comprising:

Driver part, its constitute possess owing to the belt wheel that comes power to rotate from the driving source transmission, with this belt wheel integratedly drive shaft rotating, be arranged at the impeller of said live axle with mode with the rotation of this live axle one;

Housing, its formation disposes at least a portion of the pump chamber of said impeller, is provided with the mode of the outer circumferential side that surrounds said live axle;

Mechanical seal, it is installed between said housing and the said live axle, prevents that the interior cooling water of said pump chamber is to external leaks;

Bearing; It is configured in outside the said pump chamber, the opposing party's inner ring in the relative rotary part that constitute the outer ring that possesses a side in the relative rotary part that is fixed in said driver part and said housing, is fixed in said driver part and said housing, is installed in the rotor between said outer ring and the inner ring;

Bearing seal, the axial at least end that it is configured in said bearing is fixed on the side in said outer ring and the inner ring, and have with said outer ring and inner ring in the sealing lip of ring-type of the opposing party's slide relative;

Disc, itself and said bearing seal are disposed relatively, with respect to comprising said driver part and being fixed in the said outer ring of this driver part and the solid of rotation of inner ring is fixed on the said housing slidably.

2. water pump as claimed in claim 1 is characterized in that,

Said disc constitutes and can slide with respect to the outer ring and the said belt wheel of said bearing.

3. water pump as claimed in claim 1 is characterized in that,

4. water pump as claimed in claim 3 is characterized in that,

Said rubber material is arranged on the said disc.

5. water pump as claimed in claim 1 is characterized in that,

Said disc constitutes with respect to said bearing seal and slides.

6. water pump as claimed in claim 1 is characterized in that,

At least a portion of said disc is formed with solid lubricant film, is formed with this and fixedly constitutes outer ring and the slip of said belt wheel with respect to said bearing in the position of lubricating film.

7. water pump as claimed in claim 6 is characterized in that,

Said disc constitutes can resiliently deformable.

8. water pump as claimed in claim 1 is characterized in that,

Said disc is clipped in the axial end of said bearing and is arranged between the stepped part of said housing, annular recessed portion run through the stepped part that is arranged on said housing, with the relative position of interior all side edge of said disc, and avoid this ora terminalis.

9. a water pump is characterized in that, comprising:

Driver part, its constitute possess owing to the belt wheel that comes power to rotate from the driving source transmission, with this belt wheel integratedly drive shaft rotating, be arranged at the impeller of said live axle with mode with live axle one rotation;

Disc, it is configured in from the said path that is mechanically sealed to said bearing, with respect to comprising said driver part and being fixed in the said outer ring of this driver part and the solid of rotation of inner ring is fixed on the said housing slidably.

10. a water pump is characterized in that, comprising:

Solid of rotation, it utilizes from the next power of driving source transmission and rotates;

Housing, it constitutes at least a portion of pump chamber, and this pump chamber makes the cooling water circulation of internal-combustion engine through the rotation of said solid of rotation;

Mechanical seal, it is installed between said housing and the said solid of rotation, prevents that the interior cooling water of said pump chamber is to external leaks;

The band stuffing box bearing, it is configured in the outer said solid of rotation of said pump chamber and the relative rotary part of said housing;

Disc, it is configured in the axial at least distolateral of said bearing, and is fixed in non-rotary part, with respect to said solid of rotation slidably.