CN1764785A

CN1764785A - Vane pump

Info

Publication number: CN1764785A
Application number: CN03826319.XA
Authority: CN
Inventors: 国本繁二; 青田光博
Original assignee: Unisia JKC Steering Systems Co Ltd
Current assignee: Unisia JKC Steering Systems Co Ltd
Priority date: 2003-07-07
Filing date: 2003-07-07
Publication date: 2006-04-26
Also published as: JP4484817B2; JPWO2005003564A1; WO2005003564A1

Abstract

A vane pump, comprising a vane rotor (9) rotatably stored in a cam ring and vanes (16) held so as to be projected from and recessed into a plurality of slots (15) radially formed in the outer peripheral part of the vane rotor, wherein slot formed parts (17) projectedly formed on the outer peripheral part of the vane rotor are formed of first portions (17a) on the rotating direction side of the vane rotor and second portions (17b) on the opposite side of the rotating direction side, the chamfered parts (42) of the vane rotor on the slot formed part sides are formed only at the outer edges thereof along both profiles of the first and second portions, and both outside faces of the first and second portions are formed in projected shapes with the same height as the side faces of the vane rotor on the inner peripheral sides of the chamfered parts, whereby a sealing performance can be provided by changing chamfered part forming positions on the slot formed parts of the vane rotor.

Description

Vane pump

Technical field

The present invention relates to be used for the vane pump of oil pressure supply source etc. of the power steering gear of vehicle.

Background technique

This kind is used for vehicle, provided various products in the past as vane pump always, and as one of them, the spy who issues in the Japan special permission Room opens the invention described in the flat 9-324767 communique for well-known.

This vane pump is placed stator in the inside of pump case, simultaneously, rotates in this stator and freely is provided with the vane rotor that forms the pressure chamber between the inner peripheral surface of outer circumferential face and stator.

At the peripheral part of this vane rotor, on the equally spaced position of circumferencial direction, form a plurality of slits along the radiation direction, laminal blade is supported in the inside in this each slit respectively with freely coming in and going out to the inner peripheral surface direction of described stator.Described rotor links with the live axle that leads in the pump case interpolation.The driven pulley of this live axle by being installed in the outer end side transmits rotatory force from the bent axle of motor with synchronous belt.

In addition, as long as vane rotor rotates along with the rotating drive of described live axle, each blade is outstanding from the slit with the pressure of back pressure chamber, and rotate on the inner peripheral surface sliding contact limit of the front end limit of each blade and stator.Therefore, can discharge to exhaust port by each blade compresses limit on the limit, implement the effect of pump from the working fluid that the suction port that forms in pump case flows in each interlobate pump chamber.

Thereby, in described existing vane pump, have recently as shown in Figures 7 and 8, form at the peripheral part of rotor 50 that the compartment of terrain forms weight reduction portion 53 on the outer circumferential face beyond the slit formation portion 52 in described each slit 51, for example satisfy the requirement that reduces cost by the material of cutting down the rotor 50 that is shaped with sintered alloy, simultaneously, by realizing enlarging the pump volume of 57,57 in each blade, performance reduces the effect of the pulsation of pump.

This vane pump forms the chamfered section 54 of step concavity on the external side brim of the peripheral part of rotor 50.This chamfered section 54 is when thermal sintering rotor 50, be used for preventing in advance and metal pattern between the what is called that takes place burn knurl and the parts that form, its scope is traversed the circumferencial direction of two sides of the peripheral part side of whole rotor 50, promptly traverses near the whole weight reduction portion 53 the two external side brim position 54a and position, the bi-side 54b of described slit formation portion 52 and forms.

Therefore, when rotor 50 rotates, between two sides of relative inner face 55a, the 56a of the

left side plate

55,56 that is slidingly connected respectively on two side 50a, the 50b of this rotor 50 and slit formation portion 51,, form space C, C by having chamfered

section

54b, 54b.

Therefore, the sealing between the opposing side of each

side plate

55,56 and the both side edges of blade 57 reduces, and start oil is sewed to low voltage side by described space C, C near becoming the exhaust port of maximal pressure, and pump efficiency may reduce as a result.

Summary of the invention

The present invention proposes in view of described existing technical problem, a first aspect of the present invention, first position that is the center with the slit by the sense of rotation side of rotor and constitute the slit formation portion that forms convex with second position of direction of rotation side, simultaneously, only along the chamfered section that forms described slit formation portion on the external side brim of the profile of at least any one party side in described first position and second position, the outer side surface of any one party in first position and second position is formed and convex near the rotor side surface sustained height of interior all sides of described chamfered section.

According to this invention, owing to be limited in the formation position of the chamfered section that forms in the formation portion of slit, and only form at least one side's at first, second position outer periphery, so outer side surface in addition forms convex, so this convex outer side surface is brought into play the function of sealing fully.Thereby, can fully prevent from the leakage start oil of the lateral margin of the inner face of side plate and blade.The result can prevent the decline of pump efficiency.

A second aspect of the present invention only forms the chamfered section of described slit formation portion side at the external side brim along the profile at described first position, make the outer side surface at this first position form convex.

According to this invention,, can bring into play the sealing function effectively and prevent from effectively to sew because the first position side (high pressure side) that is positioned at the rotor rotation direction from blade becomes the outer side surface of convex.

A third aspect of the present invention only forms the chamfered section of described slit formation portion side at the external side brim along the profile at described second position, make the outer side surface at this second position form convex.

According to this invention,, than sealability decline is arranged slightly with the first position side, but can improve sealing fully than the product of prior art because the outer side surface of the second position side becomes convex.

And by the second position side is made convex, because rigidity uprises, the support rigidity of blade uprises.Be that near the first position side oil pressure of exhaust port is for the highest, this high pressure is born by the side of the first position side of blade, this reaction force passes to second position, but because this second position rigidity height, the support rigidity height of blade, can obtain stable support, simultaneously, improve the durability of slit formation portion.

A fourth aspect of the present invention forms the chamfered section of described slit formation portion side at the external side brim along described first position and second position both sides' profile, makes the outer side surface at this first position and second position form convex.

According to this invention, because the both sides' at first, second position outer side surface (removing the outer side surface of chamfered section) becomes convex, so can satisfy described high leak tightness and high rigidity both sides' requirement.

Description of drawings

Fig. 1 is the sectional arrangement drawing of the vane pump of expression an embodiment of the present invention;

Fig. 2 is the A-A line sectional drawing of Fig. 1;

Fig. 3 is the vane rotor that provides of present embodiment and the front elevation of stator;

Fig. 4 is the B-B line sectional drawing of Fig. 3;

Fig. 5 is the C portion enlarged view of Fig. 3;

Fig. 6 is the D-D line sectional drawing of Fig. 5;

Fig. 7 is the enlarged view of the major component of existing vane pump;

Fig. 8 is the E-E sectional drawing of Fig. 7.

Embodiment

Below, the mode of execution of vane pump of the present invention is described in detail in detail with reference to the accompanying drawings.

This vane pump is the pump that is applicable to as the supply source of the oil pressure mechanical oil-pressures such as power steering gear of supply vehicle.As shown in Figure 1, its mainly by the pump case 1 on the cylinder body that is fixed on internal-combustion engine with screw etc., be configured in pump main body 2 in this pump case 1 and a tip side and insert logical live axle 3 in the inside of pump case 1 and constitute.

Described pump case 1 is made up of the pump housing 6 with the bulk that sucks path 4 and drain passageway 5 and the pump cover 7 that combines with its pump housing 6 as shown in Figures 1 and 2, is provided with the space portion of placing pump main body 2 between this pump housing 6 and pump cover 7.

Described pump main body 2 is as Fig. 1～shown in Figure 4, comprises accommodating the stator 8 that is configured in described pump cover 7 inside, rotating the pair of side plates 10,11 that freely is arranged on the vane rotor 9 of these stator 8 inboards and is configured in described stator 8 both sides.

Described stator 8 uses the chimeric locating stud of

cotter way

8b,

8c

13,13 of putting with a pair of small semicircle shape that forms on the position of 180 ° of the cardinal principles of outer circumferential face to be positioned at circumferencial direction on the pump case 1 as shown in Figure 3, and simultaneously, inner peripheral surface 8a forms ellipticity substantially.

Described vane rotor 9 usefulness sintered alloy unitary mouldings are discoid substantially, are divided into circular substantially pump chamber 14 between the inner peripheral surface 8a of outer circumferential face and stator 8.In addition, in the central authorities of vane rotor 9, the breakthrough form toothing is in conjunction with the zigzag fashion hole 9b of the front end 3a of described live axle 3, and described live axle 3 connects described side plate 10,11.Simultaneously, at peripheral part, on the uniformly-spaced position of circumferencial direction, form 10 slits 15 radially.This each slit 15 keeps laminal blade 16 in inside to radiation direction free sliding ground respectively, simultaneously, form in the bottom and to make each blade 16 to projected direction, front end 16a from the slit 15 opening end 15a to the outstanding back pressure chamber 15a of the inner peripheral surface 8a of stator 8 direction.

In addition, this vane rotor 9 forms circular-arc weight reduction portion 18 as Fig. 3～shown in Figure 5, and it is the notch part on the position beyond this slit formation portion 17 in described each slit 15 that forms outer circumferential face.

Described each slit formation portion 17 forms convex respectively by the existence of each weight reduction portion 18, simultaneously, on the approximate centre position of circumferencial direction, form described slit 15 respectively, constitute by the first position 17a of the sense of rotation side of the vane rotor 9 that is the center with this slit 15 with the second position 17b of direction of rotation side, the length L 3 of this first position 17a and second position 17b circumferencial direction separately, L4 are identical substantially.

Vane rotor 9 the vane rotor sense of rotation (direction of arrow) of described each slit formation portion 17 and with each external end edge of direction of rotation side on form the first circular-arc chamfered section 17c, simultaneously, form the second circular-arc chamfered section 17d between the linking department of the root of described slit formation portion 17 and described weight reduction portion 18, the radius of curvature R of this second chamfered section 17d is bigger than the radius of curvature of the first chamfered section 17c.

And then vane rotor 9 forms the 3rd roughly circular chamfered section 40 on the both sides outer periphery of the described slit formation portion 17 of peripheral part and weight reduction portion 18, and it is used to prevent take place incident burning knurl when this vane rotor 9 of thermal sintering.

The 3rd chamfered section 40 forms the step concavities, and the chamfered section 41 of weight reduction portion 18 sides is by skewed stepped part 41a, along on the external side brim of the profile of this weight reduction portion 18 by certain Rack (faciola shape) formation.On the other hand, the chamfered section 42 of described slit formation portion 17 sides forms the faciola shapes with the chamfered section of weight reduction portion 18 sides 41 and links, equally by skewed stepped part 42a only in external side brim formation along each profile of the described first position 17a and the second position 17b.Thereby this first position 17a and the second position 17b outer side surface except that described chamfered section 42 forms and the bi-side 9a of vane rotor 9, the convex of 9b equal height.

Described live axle 3 transmits the follower 19 that drives usefulness being equipped with from the outstanding the other ends of the pump housing 6, will transmit the power of motor by twisting in the outer belt of figure on this follower 19.

The side plate 10 of described side's side and the end face crimping of the pump housing 6 on this pressure contact portion, as shown in Figure 2, form the pairing left and right that is connected with the suction path 4 that is had in pump body 2 sides and inhale 2 inlets 20 in the pump housing 6.

Between the inner peripheral surface of the outer circumferential face of pump body 2 and pump cover 7, be provided with the pressure chamber 22 of the start oil that inflow discharges from the exhaust port 21 that forms at pump body 2.This pressure chamber 22 and the drain passageway 5 that is located at the pump housing 6 with this drain passageway 5 radially the vent pathway 24 that forms of opposition side be connected side by side.

In described path 5, be provided with variable restrictor device 25, and be provided with escape cock 26 with the front and back pressure reduction servo-actuated of variable restrictor device 25 at the upper reaches of vent pathway 24 end.

Described variable restrictor device 25 comprises: the guiding valve putting hole 27 that forms on the end face of the pressure chamber of the pump housing 6 22 sides; Advance and retreat freely are placed in this guiding valve putting hole 27, according to the guiding valve 28 of the opening area of its advance and retreat position increase and decrease path 5; This guiding valve 28 to the pressured spring 29 of pressure chamber's 22 sides.

This variable restrictor device 25 by balanced action in the action of advancing and retreat of the elastic force of the oil pressure of the pressure chamber 22 of an end of guiding valve 28 and spring 29, simultaneously, set guiding valve 28 with initial position that side plate 10 contact on the opening area of drain passageway 5 be maximum.An exhaust port 21 that forms on described side plate 10 is in the position upper shed relative with the end face of guiding valve 28.

Escape cock 26 comprises: guiding valve putting hole 30, and it forms on the end face of the pressure chamber of the pump housing 6 22 sides; Guiding valve 31, its advance and retreat freely are placed in this guiding valve putting hole 30; Spring 32, its this guiding valve 31 is pressured to pressure chamber's 22 sides; Floss hole 33, its when guiding valve 31 retreats according to its amount of retreating in the pressure chamber 22 split sheds, and constitute the opening end of described vent pathway 24.

Pressure in 30a side variable restrictor device 25 downstream sides, the bottom of described guiding valve putting hole 30 imports path 23 by pressure and imports.One end face of described guiding valve 31 is to pressure chamber's 22 sides, and therefore, because the pressure effect of the front and back of described variable restrictor device 25, escape cock 26 will be according to the increase and decrease of the pressure reduction before and after it control from the flow of floss hole 33 rows to vent pathway 24 in the front and back of guiding valve 31.

Thereby, according to this mode of execution, when the rotating speed of live axle 3 (vane rotor 9) hangs down, because variable restrictor device 25 is opened under the maximum state drain passageway 5, the power of escape cock 26 usefulness springs 32 is closed floss hole 33, so the increase of corresponding rotating speed, the supply flow of drain passageway 5 also increases.

When the rotational velocity of live axle 3 high to a certain degree, when the front and back differential pressure of variable restrictor device 25 surpasses setting value, because open floss hole 33 with the guiding valve 31 of the escape cock 26 of differential pressure servo-actuated before and after it, discharge start oil from vent pathway 24, so can suppress the increase of the supply oil mass of drain passageway 5.

And then, increase the rotational velocity of live axle 3 again from this state, the guiding valve 28 of variable restrictor device 25 utilize pressure chamber's 22 sides start oil oil pressure antagonistic spring 29 elastic force and retreat, will reduce the opening area of drain passageway 5 gradually.Thus, the supply oil mass of drain passageway 5 reduces gradually, obtains so-called blowing down (Off ロ-ダウ Application) characteristic.

According to this mode of execution, owing to be not on whole bi-side, to form first position 17a of slit formation portion 17 and the chamfered section 42 of the second position 17b, only on the outer periphery of edge profile separately, form, so outer side surface in addition becomes and the bi-side 9a of vane rotor 9, the convex of 9b equal height.Thereby, owing to can make two sides of slit formation portion 17 and clearance C, the C between two side plates 10,11 can be as best one can little, on two sides of convex of this slit formation portion 17, can give full play to sealing function.

As a result, can fully prevent to sew start oil from the inner face of two side plates 10,11 and the lateral margin of blade 16, thereby, the decline of pump efficiency can be prevented.

And, because each outer side surface except that the first position 17a and the second position 17b both sides' chamfered section 42 becomes convex, thus can bring into play described high sealing function, simultaneously, special owing to keeping the rigidity of the second position 17b side, so the support rigidity of each blade 16 is uprised.Promptly near exhaust port 21, the first position 17a side oil pressure is the highest, this high pressure is born by the side 16b of the first position 17a side of blade 16, this reaction force passes to the second position 17b, but because this second position 17b rigidity height, the support rigidity height to blade 16 can obtain stable support, simultaneously, the durability of slit formation portion 17 improves.

Because the radius of curvature of the second position 17d of the described slit of setting formation portion 17 is bigger than the radius of curvature of the first position 17c, as previously mentioned, in parts feeder carrying with each vane rotor 9, in the weight reduction portion 18 of the vane rotor 9 that adjoins each other and slit formation portion 17 when chimeric, closely not chimeric mutually, but the often state of simple separation become.Thereby the placement operation becomes easier.

The invention is not restricted to the structure of described each mode of execution, for example also can make a side of chamfered section 42 who forms slit formation portion 17 sides along profile as the first position 17a side, or only as the second position 17b side.At this moment, another chamfered section 42 is the same with prior art, forms on whole outer side surface.

Claims

1. vane pump, it comprises: stator, it is taken in and is configured in the pump case; Rotor, its rotation freely is accommodated in this stator, rotates with drive shaft; A plurality of slits, its peripheral part at this rotor forms along the radiation direction; Blade, its inner peripheral surface direction to described stator is come in and gone out and is freely remained in this each slit; Notch part, it forms on the position beyond the slit formation portion in the described slit of the outer circumferential face that forms described rotor; The chamfered section of concavity, its external side brim side at the peripheral part of described rotor forms, it is characterized in that, constitute the slit formation portion that forms described convex with first position that is the center by the sense of rotation side of rotor, described slit with second position of direction of rotation side, simultaneously, only along the chamfered section that forms described slit formation portion side on the external side brim of the profile of at least any one party side in described first position and second position, the outer side surface of any one party in first position and second position is formed and convex near the rotor side surface sustained height of interior all sides of described chamfered section.

2. vane pump as claimed in claim 1 is characterized in that, only along the chamfered section that forms described slit formation portion side on the external side brim of the profile at described first position, makes the outer side surface at this first position form convex.

3. vane pump as claimed in claim 1 is characterized in that, only along the chamfered section that forms described slit formation portion side on the external side brim of the profile at described second position, makes the outer side surface at this second position form convex.

4. vane pump as claimed in claim 1 is characterized in that, the chamfered section along the described slit of formation on the external side brim of described first position and second position both sides' profile formation portion side makes the outer side surface at this first position and second position form convex.